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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 44. Отображено 44.
25-03-2015 дата публикации

High-dielectric-constant polyimide film provided with multiwalled carbon nanotubes and preparation method of high-dielectric-constant polyimide film

Номер: CN104448312A
Автор: TIAN GUOFENG, SUN YIYI, WANG JUNLI, LIU JINGNI, QI SHENGLI, NIU HONGQING, HAN ENLIN, WU DEZHEN
Принадлежит:

The invention discloses a polyimide film having an outstanding dielectric property and provided with dispersed multiwalled carbon nanotubes and a preparation method of the polyimide film, and belongs to the field of functional high polymer materials. A multiwalled carbon nanotube aqueous dispersion is proportionally added to a polyamide salt solution formed through polycondensation of dianhydride and diamine and complexation of triethylamine and carboxyl, accordingly, a micro-capacitance plate is formed by the carbon tubes in a substrate, and the dielectric property of polymer is improved, wherein the volume fraction of the multiwalled carbon nanotubes is 0.1%-20%. The preparation method mainly comprises three steps as follows: (1), synthesis and salt formation of polyamide acid; (2), solution mixing of the multiwalled carbon tubes and polyamide salt; and (3), thermal cyclization of polyamide acid. According to the polyimide composite film prepared with the method, the dielectric constant ...

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Номер записи: 1
12-05-2023 дата публикации

Organic/inorganic composite aerogel with flame-retardant and heat-insulating properties and preparation method of organic/inorganic composite aerogel

Номер: CN116102772A
Автор: QI SHENGLI, ZHOU YOUDONG, TIAN GUOFENG, WU DEZHEN
Принадлежит:

The invention provides organic/inorganic composite aerogel with flame-retardant and heat-insulating properties and a preparation method of the organic/inorganic composite aerogel. The aerogel adopts polyimide (PI) nanofibers as a framework material of the aerogel, and silicon dioxide particles are uniformly dispersed in pores of the PI nanofibers. The preparation method comprises the following steps: synthesizing a polyamic acid solution through polycondensation reaction of dianhydride and diamine, preparing polyamic acid nanofibers by adopting an electrostatic spinning, air-blowing spinning or air-blowing assisted electrostatic spinning method, then dispersing the polyamic acid nanofibers and fumed silica particles in a solvent together, carrying out vacuum freeze drying on the obtained dispersion liquid, and finally carrying out thermal imidization treatment to obtain the high-temperature-resistant polyimide composite material. The PI nanofiber/silicon dioxide composite aerogel is obtained ...

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Номер записи: 2
04-03-2015 дата публикации

Flux for narrow-gap submerged arc welding

Номер: CN104384754A
Автор: CHEN YANG, TIAN GUOFENG
Принадлежит:

The invention discloses a flux for narrow-gap submerged arc welding. The flux consists of the following raw materials in part by weight: 10 to 30 parts of calcined alpha aluminium oxide, 20 to 45 parts of fluorite, 15 to 30 parts of coarse magnesia, 10 to 25 parts of fine magnesia, 10 to 25 parts of bauxite, 5 to 15 parts of wollastonite, 1 to 15 parts of rutile, 1 to 10 parts of manganese metal and 1 to 10 parts of silicon iron. The flux has the beneficial effects that 1, the flux has the characteristics of high production efficiency, low composite cost, good welding quality and the like; 2, the problem of a narrow gap in submerged arc welding is solved, the flux has good welding technological properties and mechanical properties, a weld beam is formed attractively, and slag is easy to detach.

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Номер записи: 3
06-08-2014 дата публикации

Surface modified method for high strength and high modulus polyimide fiber and application thereof

Номер: CN103966833A
Автор: WU DEZHEN, SUN XUYANG, NIU HONGQING, LIU WEIWEI, TIAN GUOFENG, QI SHENGLI
Принадлежит:

The invention provides a surface modified method for a high strength and high modulus polyimide fiber and application thereof, and belongs to the field of fiber surface modification and application thereof. The method comprises the following step: the high strength and high modulus polyimide fiber is exposed into plasma for modification, wherein the plasma is generated in process gas under effect of a radio frequency inductive coupling device, and the process gas comprises at least one from oxygen, nitrogen, argon gas and helium. According to the surface modified method for the high strength and high modulus polyimide fiber, under the circumstance that the decline of mechanical strength of the fiber is less than 5 % , the soaking performance of the fiber is effectively improved, and the surface free energy of the fiber is increased by 20% - 70%; modified fiber can be applicable to preparing a composite material with epoxy resin; compared with composite materials prepared by untreated fibers ...

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Номер записи: 4
04-04-2023 дата публикации

Novel polyimide/zirconium dioxide composite nanosphere slurry and coated diaphragm thereof

Номер: CN115911745A
Автор: WANG ZHAOYI, TIAN GUOFENG, QI SHENGLI, WU DEZHEN
Принадлежит:

The invention discloses novel polyimide/zirconium dioxide composite nanosphere slurry and a coated diaphragm thereof, which can be applied to a lithium ion battery with high energy density and high safety. The slurry is composed of polyimide/zirconium dioxide composite nanospheres, a binder, a surfactant, a dispersant and a solvent. The coating diaphragm is obtained by coating the slurry on the surface of at least one side of a porous base membrane in manners of bar coating, extrusion coating, micro gravure coating and the like. The coated diaphragm retains the mechanical properties of the original base membrane, and has more excellent thermal dimensional stability and wettability. Compared with a ceramic coating diaphragm, the coating diaphragm provided by the invention has lower surface density and better wettability, so that the energy density and charge-discharge performance of a lithium ion battery can be effectively improved when the coating diaphragm is applied to the lithium battery ...

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Номер записи: 5
09-05-2023 дата публикации

New energy charging pile

Номер: CN116080440A
Автор: WANG GUOQING, GUO SHAOYI, TIAN GUOFENG
Принадлежит:

The invention discloses a new energy charging pile, and relates to the technical field of new energy charging piles, the new energy charging pile comprises a solar panel, one side of the solar panel is fixedly connected with a U-shaped solar panel, the lower part of the solar panel is fixedly connected with a working box, and the lower part of the working box is fixedly provided with a fixed base; the surface of the working box is fixedly connected with a working console, the top surface of the working console is fixedly connected with a display screen, and the right side of the working console is fixedly connected with a pistol fixing opening. The electric wire fixedly connected to the left side surface of the charging pistol plays a role in power transmission, the device ring fixedly connected to the inner cavity of the working box plays a role in placement, and the brush fixedly connected to the inner wall of the device ring plays a role in brushing. And a reverse driving motor fixedly ...

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Номер записи: 6
15-08-2023 дата публикации

Inclination angle detection device of power transmission line tower in extreme weather

Номер: CN116592840A
Автор: ZHANG ZONGFENG, TIAN GUOFENG, LI BING, CHEN XIUYANG, ZHANG GUOFEI, YU ZHANGWEI, QIN HAO, HUH YUN-DO, ZHANG RUI, SONG YANG, LU YANG, XING JUE, GUO WEIHONG, REN YAN
Принадлежит:

An inclination angle detection device for a power transmission line tower in extreme weather relates to the technical field of power transmission line safety and is used for realizing real-time detection of the inclination angle of the tower. Comprising an installation assembly and a detection assembly, the installation assembly comprises a detection assembly installation plate and a tower end installation plate which are fixedly connected, the detection assembly is fixed to the detection assembly installation plate, the tower end installation plate is fixedly connected with a tower, and the detection assembly comprises a shell, a detection sliding block and a coil; the bottom of the detection sliding block is provided with a detection rod, the bottom of the detection rod is provided with a conductive contact, the bottom of the shell is provided with a coil located in a plane, and the detection sliding block slides along the supporting plate for a certain distance and then makes contact ...

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Номер записи: 7
21-04-2015 дата публикации

Methods of continuously manufacturing polymide fibers

Номер: US0009011739B2
Автор: Dezhen Wu, Hongqing Niu, Shengli Qi, Enlin Han, Xiaona Yan, Guofeng Tian, Xiaodong Wang, WU DEZHEN, NIU HONGQING, QI SHENGLI, HAN ENLIN, YAN XIAONA, TIAN GUOFENG, WANG XIAODONG
Принадлежит: Beijing University of Technology, WU DEZHEN, NIU HONGQING, QI SHENGLI, HAN ENLIN, YAN XIAONA, TIAN GUOFENG, WANG XIAODONG, UNIV BEIJING TECHNOLOGY, BEIJING UNIVERSITY OF TECHNOLOGY

Methods for making high quality polyimide fibers suitable for continuous industrial production are described. Polyimide fibers are continuously prepared from a polyamic acid solution through sequentially spinning the polyamic acid solution by either a wet or a dry-wet process, coagulating, drying or drying after washing, thermally treating and stretching the resulting polyamic acid fibers to obtain polyimide fibers, and winding polyimide fibers as prepared into rolls.

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Номер записи: 8
12-08-2015 дата публикации

Graphene film preparation method

Номер: CN104828808A
Автор: WU DEZHEN, ZHANG MENGYING, TIAN GUOFENG, WANG ZIQI, QI SHENGLI, LAI CHAOYING
Принадлежит:

The invention relates to a graphene film preparation method, and belongs to the technical field of graphene films. The method comprises: uniformly spreading graphene or graphite sheet powder on a paper base, plastic-based film or steel plate being in a stationary or moving forward at a uniform speed, carrying out multi-roller rolling, pressing the powder into a film through mechanical force so as to prepare a graphene or graphite sheet film, fixing the pressed film into a graphite furnace in a coil or sheet manner, carrying out a high temperature treatment under the protection of an inert gas, and naturally cooling after completing the high temperature treatment so as to obtain the completely-graphitized graphene film. According to the present invention, on the basis of no loss of the film weight and no change of the film morphology and the film thickness, the graphene film with the complete structure is obtained through the high temperature treatment so as to effectively reduce the sheet ...

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Номер записи: 9
13-09-2012 дата публикации

Methods of Continuously Manufacturing Polymide Fibers

Номер: US20120228797A1
Автор: Dezhen Wu, Hongqing Niu, Shengli Qi, Enlin Han, Xiaona Yan, Guofeng Tian, Xiaodong Wang, WU DEZHEN, NIU HONGQING, QI SHENGLI, HAN ENLIN, YAN XIAONA, TIAN GUOFENG, WANG XIAODONG
Принадлежит: BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY

Methods for making high quality polyimide fibers suitable for continuous industrial production are described. Polyimide fibers are continuously prepared from a polyamic acid solution through sequentially spinning the polyamic acid solution by either a wet or a dry-wet process, coagulating, drying or drying after washing, thermally treating and stretching the resulting polyamic acid fibers to obtain polyimide fibers, and winding polyimide fibers as prepared into rolls. 1. A method for continuously preparing polyimide fibers from a polyamic acid solution , comprising:reacting a diamine and a dianhydride in a solvent to obtain a polyamic acid solution;filtering the polyamic acid solution;defoaming the filtered polyamic acid solution under vacuum;spinning the defoamed polyamic acid solution to obtain polyamic acid fibers;coagulating polyamic acid fibers in a solvent;drying polyamic acid fibers;treating and stretching the dried polyamic acid fibers in a tubular heating furnace having at least three furnace segments to form polyimide fibers; andwinding polyimide fibers to obtain rolls of polyimide fibers.2. The method of claim 1 , wherein the diamine is a 4 claim 1 ,4′-diaminodiphenyl ether (ODA) claim 1 , a p-phenylenediamine (p-PDA) claim 1 , or a mixture thereof.3. The method of claim 1 , wherein the dianhydride is a 3 claim 1 ,3′ claim 1 ,4 claim 1 ,4′-benzophenonetetracarboxylic dianhydride (BTDA) claim 1 , a pyromellitic dianhydride (PMDA) claim 1 , a biphenyltetracarboxylic dianhydride (BPDA) claim 1 , or a mixture thereof.4. The method of claim 1 , wherein the molar ratio of the diamine and dianhydride is about 1:0.95 or 1:1.05.5. The method of claim 1 , wherein the solvent used in reacting the diamine and dianhydride is N claim 1 ,N-dimethylformamide (DMF) claim 1 , N claim 1 ,N-dimethylacetylamide (DMAC) claim 1 , N-methylepyrrolidone (NMP) claim 1 , dimethyl sulfoxide (DMSO) claim 1 , or a mixture thereof.6. The method of claim 1 , wherein reaction of the ...

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Номер записи: 10
08-08-2023 дата публикации

Preparation method of flame-retardant and heat-insulating polyimide nanofiber/silicon dioxide composite aerogel

Номер: CN116554682A
Автор: QI SHENGLI, XUE QICHENG, FAN PEIQI, FANG LEXIN, TIAN GUOFENG, WU DEZHEN
Принадлежит:

The invention relates to polyimide (PI) nanofiber/silicon dioxide composite aerogel with flame-retardant and heat-insulating properties and a preparation method of the polyimide (PI) nanofiber/silicon dioxide composite aerogel. According to the composite aerogel, polyimide nanofibers serve as a framework material of aerogel, a silicon dioxide aerogel network is inserted into a fiber framework, and the composite aerogel is of a double-network structure. The preparation method comprises the following steps: firstly, preparing a polyamic acid solution from polybasic anhydride and polyamine, and preparing the polyamic acid solution into partially imidized micro-crosslinked PI nano-fibers; then dispersing the PI nanofiber and the silicon dioxide sol in a solvent together, and performing freeze drying and high-temperature thermal imidization treatment to obtain the polyimide nanofiber/silicon dioxide composite aerogel. The preparation process is simple and easy to operate; the prepared composite ...

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Номер записи: 11
13-08-2014 дата публикации

Asymmetric perylene bisimide compounds with star structures and preparing method thereof

Номер: CN103980274A
Автор: QI SHENGLI, LI FENG, SHI LEI, TIAN GUOFENG, WU DEZHEN
Принадлежит:

The invention relates to asymmetric perylene bisimide compounds with star structures and a preparing method thereof, and belongs to the field of organic synthesis. The objective of the invention is to design and prepare the asymmetric perylene bisimide compounds with the star structures. The general structure formula of the compounds is shown as the formula (I). 4,4',4''-triamino triphenylamine and asymmetric perylene bisimide monoanhydride with different alkyl chains are adopted as reaction raw materials. The compounds with the star structures are obtained by adding a certain amount of a catalyst and reaction solvent, and reacting at 90-200 DEG C for 6-18 h according to a certain warming gradient. The compounds with the star structures are good in dissolving capacity, maintain the perylene ring plane structure, and are prone to supramolecular self-assembly in solutions. Formation of the donor-acceptor structure between the triphenylamine and the perylene core facilitates intramolecular ...

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Номер записи: 12
17-12-2014 дата публикации

Polyimide/polyolefin complex fiber membrane with cross-linked structure and preparation method

Номер: CN104213333A
Автор: QI SHENGLI, YAN XIAONA, YUAN LIJUAN, MOU HONGWEI, TIAN GUOFENG, WU DEZHEN
Принадлежит:

The invention discloses a polyimide/polyolefin complex fiber membrane with a cross-linked structure and a preparation method. The preparation method comprises the following steps of adopting an electrospinning method to prepare a non-woven polyimide/polyolefin complex fiber membrane; carrying out controlled heating treatment to enable polyolefin fiber to be heated and melted slightly; forming melting welding points among polyimide ultrafine fibers to prepare the polyimide/polyolefin complex fiber membrane with the cross-linked structure. The cross-linked shape is formed, so that the mechanical property and the dimensional stability of the fiber membrane can be remarkably improved. The polyolefin is used, so that the cost of the complex fiber membrane is greatly reduced. In addition, the polyolefin fiber membrane can be pore-closed after being heated to a certain condition, so that the polyimide/polyolefin complex fiber membrane capable of realizing the pore close function at different temperature ...

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Номер записи: 13
02-09-2015 дата публикации

Manufacturing method of polyimide/polyacrylonitrile-based blended pre-oxidized fiber

Номер: CN104878476A
Автор: WU DEZHEN, HE MIN, CAO WEIYU, NIU HONGQING, ZHANG MENGYING, TIAN GUOFENG, QI SHENGLI
Принадлежит:

The invention discloses a manufacturing method of a polyimide/polyacrylonitrile-based blended pre-oxidized fiber and belongs to the technical field of fibers. The manufacturing method comprises the following steps: uniformly mixing a PAA spinning solution and a PAN spinning solution by virtue of a mechanical blending method to obtain a PAA/PAN mixed spinning solution, and obtaining a PAA/PAN blended primary fiber by virtue of wet method/dry-wet method spinning, wherein the mass fraction of PAN, occupying PAA (without counting the solvent), is 2-80 percent; and in the heat treatment process, carrying out 4-segement thermal drying treatment, with the temperature range of 60-160 DEG C, by virtue of a layer-based thermal stabilization furnace, carrying out 4-segement pre-oxidization treatment, with the temperature range of 180-300 DEG C, and finally obtaining the PI/PAN blended pre-oxidized fiber. According to the manufacturing method disclosed by the invention, by virtue of uniform blending ...

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Номер записи: 14
27-08-2021 дата публикации

Continuous granulating and drying equipment for mass production of sintered flux

Номер: CN214065532U
Автор: ZHENG ZIXING, LIU WEIPING, TIAN GUOFENG, ZHENG JUN, WANG FUZENG, ZHANG HONGYI, 郑子行, 刘维平, 田国峰, 郑军, 王福增, 张洪义
Принадлежит: TIANJIN BRIDGE WELDING MATERIALS TECH CO LTD, TIANJIN BRIDGE WELDING MATERIALS TECHNOLOGY CO., LTD., 天津大桥焊材科技有限公司

The utility model provides continuous granulating and drying equipment for mass production of sintered flux. The continuous granulating and drying equipment comprises a barrel body, the barrel body is horizontally arranged and is of a circular-truncated-cone-shaped structure, and a transmission mechanism used for driving the barrel body to horizontally rotate is arranged outside the barrel body; a partition plate is arranged in the barrel body, the interior of the barrel body is divided into two parts by the partition plate, and the edge of the partition plate is provided with a first discharging opening communicated with the granulation area and the drying area; a main shaft is inserted into the barrel body in a penetrating manner in the central axis direction; a cavity is formed in the portion, located in the granulation area, of the main shaft to form a feeding channel, a feeding port communicated with the feeding channel is formed in the portion, close to the end of the granulation ...

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Номер записи: 15
05-08-2015 дата публикации

Special submerged arc horizontal welding flux for pressure-bearing storage tank

Номер: CN104816106A
Автор: CHEN YANG, TIAN GUOFENG
Принадлежит:

The invention provides a special submerged arc horizontal welding flux for a pressure-bearing storage tank. The special submerged arc horizontal welding flux comprises flux powder and adhesive. The flux powder comprises, by weight, 38-61 parts of oxides, 13-17 parts of fluorides, 12-17 parts of rutile, 7-11 parts of manganese mineral powder, 5-10 parts of metal manganese alloy, 5-8 parts of ferrosilicon, 1-5 parts of ferro-molybdenum, 0.5-2 parts of ferrotitanium and 0.1-0.5 part of ferro boron. The special submerged arc horizontal welding flux for the pressure-bearing storage tank can remarkably improve impact toughness, guarantee weld joint yield ratio, reduce the damage to the impact toughness, improve comprehensive performances of weld joints, meet the welding under large parameters, effectively perform supplementation against the burning loss of alloy elements in the welding process and guarantee that the mechanical properties of the weld joints meet the national standard requirements ...

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Номер записи: 16
02-05-2023 дата публикации

New energy battery storage device

Номер: CN116053677A
Автор: WANG GUOQING, GUO SHAOYI, TIAN GUOFENG
Принадлежит:

The invention discloses a new energy battery storage device, and relates to the technical field of storage, the new energy battery storage device comprises a support base, the upper surface of the support base is fixedly connected with a storage cabinet, the front side of the storage cabinet is fixedly provided with a cabinet door, the left side of the storage cabinet is fixedly provided with an anti-collision device, and the inner cavity of the storage cabinet is fixedly connected with a waterproof layer. Through the effect of the waterproof layer fixedly connected in the inner cavity of the storage cabinet, the interior of the inner cavity of the storage cabinet is not affected by external air humidity, so that the inner cavity of the storage cabinet is kept dry, through the effect of the drying layer, the inner cavity of the storage cabinet is kept dry, the humidity of the inner cavity of the storage cabinet is stabilized, and through the effect of the reinforcing layer, the humidity ...

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Номер записи: 17
01-10-2014 дата публикации

Terpolymer polynaphthalimide with widely adjustable information storage behaviors and preparation thereof

Номер: CN104072769A
Автор: QI SHENGLI, YE HEBO, SHI LEI, TIAN GUOFENG, WU DEZHEN
Принадлежит:

The invention belongs to the technical field of polymer information storage materials. By adopting a multielement copolycondensation process and using 4,4'-diamidotriphenylamine as an electron donor, 1,4,5,8-naphthyltetra formic anhydride as an electron acceptor and 9,9'-di(aminophenyl)fluorene as a third copolymerization unit, the composition of the copolymerization units is adjusted to successfully prepare the terpolymer polynaphthalimide with widely adjustable information storage behaviors. The structure is disclosed as Formula (I). The multielement copolycondensation process does not need special monomer design, can implement the functions of the material by using the existing monomer combination, and has the advantages of wide raw material sources and diversified structures. More importantly, the terpolymer polynaphthalimide has high performance adjustability, and can implement different information storage behaviors only by changing the copolymerization components, thereby effectively ...

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Номер записи: 18
07-10-2009 дата публикации

Equipment for producing high concentration dealcoholization formaldehyde and production technology thereof

Номер: CN0101550073A
Автор: XUANYU FAN, HUANMING ZHANG, XIZHONG FAN, YI LIU, GUOFENG TIAN, MENG PANG, RUI KANG, JIAYU CAO, FAN XUANYU, ZHANG HUANMING, FAN XIZHONG, LIU YI, TIAN GUOFENG, PANG MENG, KANG RUI, CAO JIAYU
Принадлежит:

The invention discloses equipment for producing high concentration dealcoholization formaldehyde and a production technology thereof; the existing production equipment are utilized to set and a formaldehyde absorption tower into four layers; a formaldehyde gas pipeline is arranged between the bottom of an oxidation reactor and the bottom of a dealcoholization tower; the formaldehyde gas pipeline between the bottom of the oxidation reactor and the bottom of the dealcoholization tower and a formaldehyde gas pipeline between the oxidation reactor and the dealcoholization tower are provided with acontrol valve respectively. Methanol is added into a methanol evaporator from a methanol inlet; in the methanol evaporator, the methanol becomes gas after being heated by hot formaldehyde in the methanol absorption tower; after going through a superheater and a filer and entering the oxidation reactor for reaction, the methanol gas becomes the formaldehyde gas containing methanol; the formaldehyde ...

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Номер записи: 19
06-06-2023 дата публикации

Drying device for plastic particles

Номер: CN116214768A
Автор: GAO YONGZHI, CHANG QING, GUO YANCHUN, TIAN GUOFENG, BI YAN, ZHANG BAOLIN, XU GONGCHEN, YANG ZUOJUN
Принадлежит:

The invention belongs to the technical field of drying, and particularly relates to a drying device for plastic particles, which comprises a feeding assembly, a separation tank and a drying tank, the bottom of the drying tank is provided with supporting legs and a discharge pipe, the side part of the drying tank is provided with a drain pipe, the drying tank comprises an inner container and an outer tank, the inner container is arranged in the outer tank, and the outer tank is arranged in the outer tank. A gap is formed between the inner container and the outer tank, a blower is installed at the bottom of one side of the outer tank and penetrates through the outer tank to be communicated with the inner container, and an exhaust fan is installed at the top of the other side of the outer tank. According to the plastic particle drying device, water on plastic particles can be separated from plastic through the effect of the separation tank, meanwhile, the plastic particles obtained after water ...

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Номер записи: 20
17-06-2015 дата публикации

Preparation for perylene bisimide film and application of perylene bisimide film as high-density rapid information storage material

Номер: CN104716274A
Автор: QI SHENGLI, BAO LIN, TIAN GUOFENG, WU DEZHEN
Принадлежит:

The invention relates to preparation for a perylene bisimide film and the application of the perylene bisimide film as a high-density rapid information storage material, and belongs to the technical field of organic information storage materials. According to the preparation, firstly, soluble perylene bisimide derivatives containing the electron donor and receptor structure are obtained through reaction of PTCDA replaced at the second perylene bay position and imide containing carbazole electro-donating unit monoamine; secondly, the self-assembling perylene bisimide film is prepared by relying on the pi-pi accumulation action among molecules through a steam diffusion self-assembling method. The self-assembling perylene bisimide film is applied to an active layer of an information memory device, the storage device shows excellent electric bistable state information storage behavior, the switch ratio of the storage device is higher than 104, the signal write-in voltage is only 0.8 V, the ...

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Номер записи: 21
17-08-2021 дата публикации

Surface silvering polyimide film and preparation method thereof

Номер: CN113263809A
Автор: QI SHENGLI, WANG XI, DONG NANXI, TIAN GUOFENG, WU DEZHEN, 齐胜利, 王希, 董南希, 田国峰, 武德珍
Принадлежит:

The invention provides a surface silvering polyimide film which is integrally of a three-layer composite structure, a base body is a polyimide film, a transition layer is a polyimide nanofiber film and silver composite layer, and a surface layer is a compact pure silver layer. The thickness of the nanofiber membrane transition layer in the film is controllable, the silver loading capacity is controllable, the utilization rate is high, Ag < + > only exists in the nanofiber membrane, a polyimide matrix is not damaged, the mechanical property is good, an IPN interpenetrating network structure is formed between the nanofiber membrane and the polyimide matrix, and the interface adhesion is good. The preparation method of the film is simple in implementation process, conditions are easy to meet, the preparation method is suitable for polyimide of all systems, and the prepared polyimide/silver composite film material has the advantages of being excellent in interface bonding performance, good ...

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Номер записи: 22
07-04-2023 дата публикации

New energy battery protection device

Номер: CN115939644A
Автор: WANG GUOQING, GUO SHAOYI, TIAN GUOFENG
Принадлежит:

The invention discloses a new energy battery protection device, and relates to the technical field of new energy batteries, the new energy battery protection device comprises a protection shell, the front surface of the protection shell is fixedly provided with a sealing door, the inner cavity of the protection shell is in threaded sleeve connection with a threaded column I, and the upper surface of the threaded column I is fixedly provided with a dustproof net I; the inner cavity of the protective shell is sleeved with a first screw in a threaded mode, and the lower surface of the first screw is fixedly connected with a limiting plate. By opening a sealing door, the front face of a protective shell is opened, a fixing frame is placed in an inner cavity of the protective shell, a first screw is twisted, the first screw moves downwards under the action of the protective shell, and a limiting plate fixedly connected to the lower surface of the first screw moves downwards under the action ...

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Номер записи: 23
13-08-2014 дата публикации

Polyimide/silicon dioxide composite nanofiber film and preparation thereof

Номер: CN103981634A
Автор: QI SHENGLI, YU HONGSHENG, LIU BINGXUE, TIAN GUOFENG, YAN XIAONA, WU DEZHEN
Принадлежит:

The invention discloses a polyimide composite nanofiber film with the surface coated with silicon dioxide nano particles or silicon dioxide nanolayers and a preparation method thereof, and belongs to the field of high polymer materials. Polyamide acid precursor nanofibers with the surface containing silicon sources are prepared firstly by adopting electrostatic spinning, precursor nanofibers with parts imidized and the surface coated with a silicon source are manufactured by controlling heat processing temperature, and then the polyimide composite nanofiber film with the surface coated with the silicon dioxide nano particles or the silicon dioxide nanolayers can be obtained through acidification and hydrolyzation processing and high temperature thermal cyclization processing. Compared with an original polyimide fiber film, the polyimide nanofiber film with the surface coated with nanosilicon dioxide has higher temperature resistance performance and dimensional stability to heating, specially ...

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Номер записи: 24
07-07-2023 дата публикации

New energy power supply box body

Номер: CN116404548A
Автор: WANG GUOQING, GUO SHAOYI, TIAN GUOFENG
Принадлежит:

The invention discloses a new energy power supply box body, and relates to the technical field of power supply boxes, the new energy power supply box body comprises a placing box, a stabilizing mechanism is arranged in the placing box, a heat dissipation mechanism is arranged on one side of the stabilizing mechanism, the stabilizing mechanism comprises a placing plate, an L-shaped plate and a stabilizing plate, the placing plate is arranged in the placing box, and the L-shaped plate is arranged in the L-shaped plate. The L-shaped plates are arranged above the placing plate, the number of the L-shaped plates is two, the stabilizing plate is arranged below the L-shaped plates, and the heat dissipation mechanism comprises a heat dissipation opening, a moving plate and a fan. An L-shaped plate moves and extrudes a spring by pulling a handle, at the moment, a power supply is placed on a placement plate, the handle is loosened, the L-shaped plate moves to the position above the power supply through ...

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Номер записи: 25
09-05-2023 дата публикации

New energy battery recycling machine

Номер: CN116078477A
Автор: WANG GUOQING, GUO SHAOYI, TIAN GUOFENG
Принадлежит:

The invention discloses a new energy battery recycling machine, and relates to the technical field of new energy automobiles, the new energy battery recycling machine comprises a crushing box, a separation assembly and a recycling assembly, the bottom of the crushing box is fixedly connected with the top of the separation assembly, one side of the separation assembly is fixedly connected with one side of the recycling assembly, and the crushing box comprises a box body; the bottom of the box body is fixedly connected with the top of a separation assembly, and the top of the inner wall of the box body is movably connected with a positioning rotating shaft. According to the new energy battery crushing device, an elastic rod is pulled to move out of a clamping groove, a handle is pulled while the elastic rod moves out to pull up a box cover through a positioning rotating shaft, so that a new energy battery is put into a box body, then the box cover covers the box body, and at the moment, a ...

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Номер записи: 26
30-12-2015 дата публикации

ADSS optical cable ground wire hanging wire pillar fastening anchor clamps

Номер: CN0204925483U
Автор: YAN YU, YU FAYI, TIAN GUOFENG, LIU HONGBO, LYU MAOMING, SUN CHANGXIU, WANG HUI, WANG FANG
Принадлежит:

The utility model discloses mainly used 10kV-35kV overhead power line ADSS optical cable enters the station, specifically be a ADSS optical cable ground wire hanging wire pillar fastening anchor clamps, form by two zinc -plated band steel combinations, the middle part of each the zinc -plated band steel form a rectangle draw -in groove of bending, both ends form to the right angle hem that turns up, set up bolt mounting holes on the right angle hem, the face -to -face setting of notch and the two rectangle draw -in grooves of the rectangle draw -in groove of two zinc -plated band steels enclose into ground wire hanging wire pillar centre gripping space, the corresponding right angle hem in position passes through the bolted connection fastening on the two zinc -plated band steels, the fixed link plate in the back of the rectangle draw -in groove of one of them zinc -plated band steel has ADSS optical cable hanging hole on the link plate. This fastening anchor clamps low in manufacturing ...

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Номер записи: 27
07-01-2015 дата публикации

Polymer composite, preparation method and application thereof as well as prepared bush

Номер: CN104262951A
Автор: YUAN LING, TIAN GUOFENG
Принадлежит:

The invention belongs to the technical field of materials, and discloses a polymer composite, a preparation method and an application thereof as well as a prepared bush. Raw materials in parts by mass including 70-100 parts of polyamide resin, 5-20 parts of high strength glass fiber, 1-10 parts of solid glass beads, 0-2 parts of an antioxidant, 0-2 parts of a lubricant and 0-2 parts of a coupling agent are mixed and subjected to extrusion granulation to obtain a product. The polymer composite applies to preparation of a locomotive traction device, a pin bush, military equipment, construction machinery, vehicles, ships, hydraulic engineering, oil production equipment or lifting machinery. The bush prepared by the polymer composite is a pin bush which is obtained by the polymer composite subjected to drying, extrusion molding, stress relief, machining, inspection, appearance clean, packaging and storage sequentially. The physical combination property of the polymer composite is excellent, ...

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Номер записи: 28
23-07-2014 дата публикации

Surface modification method for high-performance polyimide fiber as composite reinforced material

Номер: CN103938439A
Автор: WU DEZHEN, CHEN BINBIN, NIU HONGQING, TIAN GUOFENG, QI SHENGLI, WU ZHANPENG
Принадлежит:

The invention discloses a surface modification method for a high-performance polyimide fiber as a composite reinforced material, and belongs to the technical field of surface modification of a high-performance organic fiber. The surface modification method for the high-performance polyimide fiber disclosed by the invention comprises the steps of preparing alkaline treatment fluid; determining treatment conditions; washing the fiber to neutral after treatment; and drying. The excellent mechanical property of the fiber is reserved after the high-performance polyimide fiber is processed by the method disclosed by the invention, and the surface energy and the surface polarity are increased, so as to reinforce the composite performance with epoxy resin. The specific performances are as follows: the mechanical property of the fiber after surface treatment is maintained at 95%-107%,h te free energy on the fiber surface is improved to 16%-39%, and the interlaminar shear strength of the fiber and ...

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Номер записи: 29
18-06-2014 дата публикации

Polyimide nanofiber membrane with surface coated with nano titanium dioxide and preparation method for polyimide nanofiber membrane

Номер: CN103866491A
Автор: QI SHENGLI, MOU HONGWEI, LIU BINGXUE, TIAN GUOFENG, YAN XIAONA, WU DEZHEN
Принадлежит:

The invention discloses a polyimide nanofiber membrane with the surface coated with nano titanium dioxide and a preparation method for the polyimide nanofiber membrane. The preparation method comprises the steps of synthesizing polyamide acid through diamine and binary anhydride to prepare a nanofiber membrane by an electrospinning technology, and then immersing the nanofiber membrane into titanium dioxide sol with different concentrations or partially cyclizing a polyamide acid nano fiber membrane, immersing the cyclized polyamide acid nano fiber membrane into the titanium dioxide sol, drying and preparing the polyimide nanofiber membrane with the surface coated with the nano titanium dioxide through gradient heating thermal imidization. The polyimide nanofiber composite membrane provided through the preparation method disclosed by the invention is formed by coating the surface of a polyimide nanofiber with titanium dioxide particles or a titanium dioxide layer; the particle size of the ...

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Номер записи: 30
25-06-2014 дата публикации

Fire-retarding high-molecular plastic and coal mine tunnel base plate prepared from same

Номер: CN103881206A
Автор: SUN ZHONGHUI, SUN QINGHUA, GUO HENGBIN, ZOU MEIYUAN, YU FUDE, HOU SHAOGANG, GUO XILIN, TIAN GUOFENG, LI CHENGHAO
Принадлежит:

The invention discloses fire-retarding high-molecular plastic and a coal mine tunnel base plate prepared from the same. The fire-retarding high-molecular plastic comprises the following components in parts by weight: 40-70 parts of polyethylene resin, 10-30 parts of compounded fire retardant, 1-5 parts of antioxidant, 1-5 parts of lubricating agent and 1-4 parts of carbon black. The coal mine tunnel base plate provided by the invention comprises a rectangular base plate and a fence plate fixed around the rectangular base plate and vertical to the rectangular base plate; a plurality of horizontal plates and longitudinal plates, which are vertical to the rectangular base plate, are arranged in the fence plate; the two ends of each horizontal plate and the two ends of each longitudinal plate are fixedly connected with the fence plate; the horizontal plates, the longitudinal plates, the fence plate and the rectangular plate form a plurality of rectangular cavities with the same size; rectangular ...

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Номер записи: 31
02-09-2015 дата публикации

High-conductivity polyimide/carbon material/silver three-phase composite film and preparing method thereof

Номер: CN104877156A
Автор: TIAN GUOFENG, WANG JUNLI, QI SHENGLI, NIU HONGQING, HAN ENLIN, WU DEZHEN
Принадлежит:

The invention relates to a high-conductivity polyimide/carbon material/silver three-phase composite film and a preparing method thereof, and belongs to the field of electric-conduction and electromagnetic shielding composite films. The preparing method of the polyimide composite film includes the steps that polyamide salt formed by dicarboxylic anhydride and diamine in a condensation polymerization mode serves as a precursor, carbon materials in a certain proportion and silver with silver trifluoroacetylacetone as a precursor are doped into the polyamide salt, and high-temperature imidization is carried out to obtain the film. The mass percent of the silver ranges from 0% to 20%, and the mass percent of the carbon materials ranges from 0% to 30%. The molecular proportion of dicarboxylic anhydride monomers to diamine monomers ranges from 1-1.2:1. The polyimide composite film prepared with the method has the advantages that the resistance and the electromagnetic shielding effectiveness are ...

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Номер записи: 32
08-09-2020 дата публикации

High-temperature-resistant polyamide material and preparation method thereof

Номер: CN0111635520A
Автор: WU JIA, QI YUGANG, WANG CHAOJIN, TIAN GUOFENG, ZHANG QUANFU, BI YAN, LI YACHI, LI HUIMIN
Принадлежит:

The invention discloses a high-temperature-resistant polyamide material and a preparation method thereof. According to the invention, a heating-dehydration condensation method is adopted, and the high-temperature-resistant polyamide material is prepared through the processes of salifying, pre-polymerizing and solid-phase tackifying. The prepared high-temperature-resistant polyamide material comprises an aromatic polyamide component and a short-chain fatty polyamide component at the same time, and the aromatic polyamide network component in the high-temperature-resistant polyamide material is grafted with the short-chain fatty polyamide network component to form the semi-crystalline high-temperature-resistant polyamide material. The high-temperature-resistant polyamide has high temperatureresistance and processability, and can be applied to engine accessories, reflow soldering and the like.

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Номер записи: 33
30-08-2016 дата публикации

Polyimide fiber with high strength and high modulus and its preparation method

Номер: US0009428614B2
Автор: Dezhen Wu, Hongqing Niu, Shengli Qi, Enlin Han, Xiaona Yan, Guofeng Tian, Zhanpeng Wu, Xiaodong Wang, WU DEZHEN, NIU HONGQING, QI SHENGLI, HAN ENLIN, YAN XIAONA, TIAN GUOFENG, WU ZHANPENG, WANG XIAODONG, Wu Dezhen, Niu Hongqing, Qi Shengli, Han Enlin, Yan Xiaona, Tian Guofeng, Wu Zhanpeng, Wang Xiaodong
Принадлежит: BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY, UNIV BEIJING CHEMICAL TECH

A high-strength high-modulus polyimide fiber and its preparation method pertain to the technical field of high-performance organic fiber. This fiber includes the polyimide (PI) fiber made from 3,3′,4,4′-biphenyl tetracarboxylic diandhydride (BPDA), p-phenylenediamine (pPDA) and 2-(4-aminophenyl)-1H-benzimidazol-5-amine (BIA), wherein the molar ratio between PPDA and BIA is 1:10˜3:1. During the synthesis, other diamine and diandhydride monomers may also be added. In the preparation process, the gradient temperature reaction method and one-step continuous preparation method are adopted, the synthesis and processing difficulty caused by the increase of the content of BIA is overcome, the problem of poor uniformity and stability of fiber is solved and PI fiber with high strength and high modulus is obtained. Its strength may reach 4.5 GPa and modulus may reach 201 GPa. Moreover, the sources of the raw materials are extensive, the spinning process is continuous, the cost is low, the efficiency is high and industrial production may be realized.

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Номер записи: 34
08-12-2010 дата публикации

Automatic closing wrapper of snap-on insulation sheathing tube

Номер: CN0101908748A
Автор: JIAWANG XU, CHENGYONG YANG, ZHANGWEI YU, GUOFENG TIAN, ZONGBO LI, XU JIAWANG, YANG CHENGYONG, YU ZHANGWEI, TIAN GUOFENG, LI ZONGBO
Принадлежит:

The invention discloses an automatic closing wrapper of a snap-on insulation sheathing tube, belonging to a special appliance for realizing automatic closing packaging aiming at the snap-on insulation sheathing tube of electric power transmission leads. A sheathing tube wind up roll 13, a closer and an operating control device are arranged on a back-up block 3, wherein the closer comprises a pressing roll 8 and side slip rolls 10; the side slip rolls are arranged on two symmetric swing arms 7; the operating control device comprises an insulation operating rod 1, a continuous motion rod 4 and a swirl shifting block 5; the top end of the insulation operating rod is provided with a gear 15 matched with a rack 14; the rack is connected with the continuous motion rod which is connected with the swirl shifting block; and two ends of the swirl shifting block respectively contact with the two swing arms. The insulation operating rod is rotated, the lower ends of the two swing arms are controlled ...

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Номер записи: 35
01-10-2014 дата публикации

Preparation method for 240-grade blended polyimide wire enamel

Номер: CN104073155A
Автор: WU DEZHEN, SUN FEI, TIAN GUOFENG, QI SHENGLI
Принадлежит:

The invention provides a preparation method for a 240-grade blended polyimide wire enamel, which belongs to the technical fields of insulating paints and wire enamels. The preparation method comprises the following steps: adding block 4,4'-diaminodiphenyl ether (ODA) into a polar solvent, then adding 1,2,4,5-pyromellitic dianhydride (PMDA) in one shot after the block 4,4'-diaminodiphenyl ether is completely dissolved and carrying out a reaction in an ice-water mixed bath until the reaction reaches a terminal point; reacting 4,4'-diaminodiphenyl ether with 3,3',4,4'-biphenyltetracarboxylic diandhydride (BPDA) in another identical device under same conditions, thereby obtaining two different polyamide acid (PAA) solutions; blending the two different polyamide acid solutions in proportion as needed; and finally, supplementing the polar solvent under mechanical stirring according to desired solid content and viscosity. The abrupt-change temperature of dielectric loss of the 240-grade blended ...

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Номер записи: 36
03-06-2015 дата публикации

High dielectric constant polyimide/multiwalled carbon nanotube/nano barium titanate composite film and preparation method thereof

Номер: CN104672900A
Автор: TIAN GUOFENG, WANG JUNLI, SUN YIYI, LIU JINGNI, QI SHENGLI, NIU HONGQING, HAN ENLIN, WU DEZHEN
Принадлежит:

The invention relates to a high dielectric constant polyimide/multiwalled carbon nanotube/nano barium titanate composite film and a preparation method thereof, and belongs to the field of functional high molecular materials. The polyimide composite film provided by the invention is prepared by taking polyamide salt prepared by carrying condensation polymerization on binary anhydride and diamine and complexing triethylamine and carboxyl as precursor, doping a certain ratio of multiwalled carbon nanotube aqueous dispersion and nano barium titanate, and then carrying out high-temperature imidization, wherein the volume percentage of the multiwalled carbon nanotube is 0-20%, the volume percentage of the nano barium titanate is 0-20%, and the mol ratio of the binary anhydride monomer and the diamine monomer is (1-1.2):1. The polyimide composite film prepared by the method provided by the invention has the characteristic of adjustable dielectric constant, the dielectric loss is increased lightly ...

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Номер записи: 37
12-05-2023 дата публикации

New energy battery drying device

Номер: CN116105481A
Автор: WANG GUOQING, GUO SHAOYI, TIAN GUOFENG
Принадлежит:

The invention discloses a new energy battery drying device, and relates to the technical field of new energy battery treatment, the new energy battery drying device comprises a drying box, the front surface of the drying box is fixedly provided with a box door through hinges, the top of the drying box is provided with two exhaust ports, and the bottom wall of the drying box is fixedly provided with a protective shell; heating wires are fixedly mounted on the two side walls of the upper portion in the drying box, blocking nets are fixedly mounted on the inner walls of the two exhaust ports, and two U-shaped mounting bases are arranged in the drying box. A motor is started to drive a rotating disc to rotate through a rotating shaft, the rotating disc drives two rotating shafts to rotate, the rotating disc drives two rotating discs to rotate through the two rotating shafts, the rotating discs drive a U-shaped mounting base to rotate, and meanwhile the rotating shaft drives a rotating piece ...

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Номер записи: 38
27-08-2014 дата публикации

Method for preparing polyimide flexible copper-clad plate free of rubber with ultrathin copper layer through integral forming

Номер: CN104005009A
Автор: QI SHENGLI, BU JUNFENG, TIAN GUOFENG, WU ZHANPENG, WU DEZHEN
Принадлежит:

A method for preparing a polyimide flexible copper-clad plate free of rubber with an ultrathin copper layer through integral forming belongs to the field of flexible copper-clad plates, a surface layer of a polyimide thin film is first covered with a thin seed metal layer through fast ion exchange in a short time by adopting a direct ion exchange self-metallization method and subsequent heat treatment. Then secondary metal layer depositing is conducted on the basis of the seed metal layer through a traditional chemical plating method, and the step aims at achieving efficient controllable depositing of the metal layer by utilizing the chemical plating technology and ensuring that the complete and compact metal layer is obtained. The two steps are combined to achieve efficient, fast, integral and continuous preparation of the ultrathin copper-clad plate free of the rubber, wherein the ultrathin copper-clad plate has high interface adhesion and high conductivity, and the thickness of the copper ...

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Номер записи: 39
21-07-2023 дата публикации

Bag sewing machine

Номер: CN116461788A
Автор: BI YAN, GAO YONGZHI, WANG XUEPING, CHANG QING, TIAN GUOFENG, YAN WUZHOU
Принадлежит:

The bag sewing machine comprises a belt conveyor and a bag sewing assembly, the bag sewing assembly comprises a stand column fixedly installed on one side of the belt conveyor, a bag clamping assembly is arranged in the bag sewing machine and comprises two portal frames fixedly installed at the two ends of the belt conveyor, and one end of an output shaft of a motor is connected with a second lead screw; a bag clamping frame is installed on the guide rod in a sliding mode and comprises a first bag clamping plate and a second bag clamping plate, the upper end of the first bag clamping plate is hinged to the upper end of the second bag clamping plate, and a threaded sleeve is arranged on one side of the first bag clamping plate. A pull rod is arranged on the other side of the second lead screw and is of a smooth rod-shaped structure with the middle protruding outwards, a connecting rod is hinged to the upper portion of the second bag clamping plate, and the other end of the connecting rod ...

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Номер записи: 40
17-12-2014 дата публикации

High dielectric polyimide composite material and preparation method thereof

Номер: CN104211962A
Автор: TIAN GUOFENG, LIU JINGNI, QI SHENGLI, NIU HONGQING, HAN ENLIN, WU DEZHEN
Принадлежит:

The invention relates to a polyimide nano composite material with a high dielectric constant and a preparation method thereof, and belongs to the field of organic/inorganic hybrid materials. The polyimide nano composite film material disclosed by the invention takes polyimide which is obtained by an anhydride monomer and a diamine monomer in a manner of polycondensation as the matrix and is doped with graphene and nano barium titanate, wherein the volume fraction of the graphene in the material is 0-3%; the volume fraction of nano barium titanate in the material is 0-20%; and the molar ratio of the anhydride monomer to the diamine monomer is (1.1 to 1) to 1. The polyimide nano composite material disclosed by the invention has a high dielectric constant and low loss, and can still keep good mechanical property, thereby overcoming the problems that an existing dual-phase high dielectric material is poor in tenacity, and difficult in control on packing amount and the like. The polyimide nano ...

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Номер записи: 41
13-08-2014 дата публикации

Isomerized polyimide capable of being used for flexible high-density information storage material, and preparation of isomerized polyimide

Номер: CN103980493A
Автор: QI SHENGLI, CHENG JUNHAO, SHI LEI, TIAN GUOFENG, WU DEZHEN
Принадлежит:

The invention relates to an isomerized polyimide capable of being used for a flexible high-density information storage material, and preparation of the isomerized polyimide, belonging to the technical field of organic information storage materials. The preparation method comprises the following steps: synthesizing an isomerized diamine monomer containing an electron donor unit by taking N-phenylcarbazole as a basic structure design, and polymerizing with dianhydride with the electron acceptor performance, thus obtaining the isomerized polyimide containing an electron donor and acceptor structure. The prepared polyimide shows excellent electric bistable information storage performance. The isomerized polyimide has excellent dissolving capacity, can realize the controllability and adjustment on the storage action of the material by selecting different isomerized monomers, and is simple in synthesis route, high in yield and capable of conducting repeated mass production. The method for preparing ...

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Номер записи: 42
23-05-2012 дата публикации

Automatic closing wrapper of snap-on insulation sheathing tube

Номер: CN0101908748B
Автор: XU JIAWANG, YANG CHENGYONG, YU ZHANGWEI, TIAN GUOFENG, LI ZONGBO, JIAWANG XU, CHENGYONG YANG, ZHANGWEI YU, GUOFENG TIAN, ZONGBO LI
Принадлежит:

The invention discloses an automatic closing wrapper of a buckle type insulation sheathing tube, belonging to a special appliance for realizing automatic closing packaging aiming at the buckle type insulation sheathing tube of electric power transmission leads. A sheathing tube wind up roll (13), a closer and an operating control device are arranged on a back-up block (3), wherein the closer comprises a pressing roll (8) and side slip rolls (10); the side slip rolls are arranged on two symmetric swing arms (7); the operating control device comprises an insulation operating rod (1), a continuous motion rod (4) and a swirl shifting block (5); the top end of the insulation operating rod is provided with a gear (15) matched with a rack (14); the rack is connected with the continuous motion rod which is connected with the swirl shifting block; and two ends of the swirl shifting block respectively contact with the two swing arms. The insulation operating rod is rotated, the lower ends of the ...

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Номер записи: 43
30-05-2013 дата публикации

POLYIMIDE FIBER WITH HIGH STRENGTH AND HIGH MODULUS AND ITS PREPARATION METHOD

Номер: US20130137846A1
Автор: HAN ENLIN, NIU HONGQING, QI SHENGLI, TIAN GUOFENG, Wang Xiaodong, WU DEZHEN, WU ZHANPENG, YAN XIAONA
Принадлежит: Beijing University of Chemical Technology

A high-strength high-modulus polyimide fiber and its preparation method pertain to the technical field of high-performance organic fiber. This fiber includes the polyimide (PI) fiber made from 3,3′,4,4′-biphenyl tetracarboxylic diandhydride (BPDA), p-phenylenediamine (pPDA) and 2-(4-aminophenyl)-1H-benzimidazol-5-amine (BIA), wherein the molar ratio between PPDA and BIA is 1:10˜3:1. During the synthesis, other diamine and diandhydride monomers may also be added. In the preparation process, the gradient temperature reaction method and one-step continuous preparation method are adopted, the synthesis and processing difficulty caused by the increase of the content of BIA is overcome, the problem of poor uniformity and stability of fiber is solved and PI fiber with high strength and high modulus is obtained. Its strength may reach 4.5 GPa and modulus may reach 201 GPa. Moreover, the sources of the raw materials are extensive, the spinning process is continuous, the cost is low, the efficiency is high and industrial production may be realized. 144. A high-strength high-modulus polyimide fiber , comprising polyimide fiber obtained from random copolymerization of 3 , 3′ , , ′-benzophenone tetracarboxylic dianhydride (BPDA) , p-phenylenediamine (pPDA) and 2-(4-aminophenyl)-1H-benzimidazol-5-amine (BIA) , wherein molar ratio between pPDA and BIA is 1:10˜3:1.2. The high-strength high-modulus polyimide fiber according to claim 1 , wherein the polyimide fiber comprises copolymerization of BPDA claim 1 , pPDA and BIA with other diamine or/and dianhydride claim 1 , wherein molar ratio between said other diamine and the total addition amount of pPDA and BIA is 1:10˜1:4 claim 1 , molar ratio between said other dianhydride and BPDA is 1:10˜3:7.3. A method for preparing the high-strength high-modulus polyimide fiber according to claim 1 , comprising the following steps:A: providing pPDA, BIA and BPDA at a molar ratio of 1:0.95˜1:1.05 between pPDA and BPDA And at a molar ratio of 1:10 ...

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Номер записи: 44