Expanded vitrified micro-bead fireproof thermal-insulation board and preparation method thereof

The invention relates to an expanded vitrified micro-bead fireproof thermal-insulation board and a preparation method thereof, belonging to the field of construction materials. In the invention, inorganic expanded vitrified micro-beads, which are used as main raw materials, are combined with an organic binder, molded in a die and sintered, so that the expanded vitrified micro-beads are bound to form a compact single-layer board; and meanwhile, in the sintering process, the content of organic matters in the thermal-insulation board is greatly reduced to further enhance the fire resistance of the fireproof thermal-insulation board, thereby obtaining the fireproof thermal-insulation board with favorable comprehensive properties. The preparation technique of the expanded vitrified micro-bead fireproof thermal-insulation board is simple; and the expanded vitrified micro-bead fireproof thermal-insulation board has the advantages of low coefficient of thermal conductivity, high strength, excellent ...

Method for producing feruloyl esterase

The invention discloses a method for producing feruloyl esterase and belongs to the technical field of bio-enzyme preparation production. The method comprises the following steps: fermenting by utilizing a genetic engineering strain of the constitutive expressed feruloyl esterase, and by taking the starch saccharification liquid, the maize slurry and the ammonia water as main raw materials, preparing the feruloyl esterase, continuously adding a fermentation culture medium and discharging part of the fermenting fluid in bathes during the fermentation engineering, continuously extending the fermenting period under a no-sundry bacterium contamination condition, and filtering by a plate frame filter, and performing ultrafiltration concentration and spray drying on the fermenting fluid to obtain the high-activity feruloyl esterase preparation. The specific steps are as follows: (1) strain preparation; (2) culture expansion; (3) submerged fermentation and feruloyl esterase production; and (4) ...

Harmful organism movement monitoring method used during agricultural product storage and conveying

The invention discloses a method for monitoring hazardness activity of pest during agricultural product storage and transportation, which is on the bases of that breath intensity of stored and transported agricultural product is low, when mildew or insect acts, they absorbs oxygen gas and discharges carbon dioxide, gas components of storage and transportation environment is changed. Gas transportation pipes are beforehand laid at monitoring position, gas at monitoring position is transmitted by gas pump and detected in a gas sensor, when change rate of monitored gas is abnormal, situation that the storage and transportation agricultural product is suffered harm of pest can be determined. Advantages of the invention are: on site sampling is not needed, detection sensitivity is high, and harm of insect and mildew can be synchronously monitored.

Expression method of ferulic acid esterase A of penicillium chrysogenum to pichia pastoris and preparation method of enzyme preparation of ferulic acid esterase A

The invention provides an expression method of ferulic acid esterase A of penicillium chrysogenum to pichia pastoris and a preparation method of an enzyme preparation of the ferulic acid esterase A. The preparation method is characterized by comprising the steps of amplifying an encoding gene of ferulic acid esterase A from a penicillium chrysogenum genome DNA by using a PCR technology, and connecting the encoding gene to a pGAPZalphaA carrier to construct a recombinant plasmid; linearizing the recombinant plasmid, and transferring the linearized recombinant plasmid into a pichia pastoris X-33 strain to obtain an engineering strain for constitutive expression of penicillium chrysogenum; and treating a strain fermentation solution by using ultrafiltration concentration, cation exchange and freeze drying technologies to prepare the high-purity enzyme preparation. By using the method provided by the invention, the high-purity enzyme preparation of the ferulic acid esterase A of the penicillium ...

Anti-sticking plate mold pressing coating for anti-counterfeiting hot stamping film

The invention relates to an anti-sticking plate mold pressing coating for an anti-counterfeiting hot stamping film. The anti-sticking plate mold pressing coating is prepared from the substances such as polytetrafluoroethylene, acrylic resin and maleic anhydride in a blending manner. The coating system is low in surface tension, so that action force between a nickel plate and a mold pressing coating is reduced, and the problem of plate sticking in mold pressing is solved. Meanwhile, the strength of the mold pressing coating is reduced by adding the polytetrafluoroethylene. Thus, the cutting performance of the coating is improved, the stability of the product in the mold pressing process and the later hot stamping process is ensured, the operational performance of the product is improved, and the anti-sticking plate mold pressing coating plays an important role in production and application of a holographic anti-counterfeiting film.

Method for rapid quantitative determination of microbiological activity value in agricultural products and related products

The invention discloses a method for rapid quantitative determination of microbiological activity value in agricultural products and related products which comprises, washing the definite quantity samples, filtering, obtaining cleaning mixture, charging definite quantity of washing detergent and hydrogen dioxide solution into reactor with air impermeability, sealing for heat preservation reaction, detecting amount of oxygen generated by reaction liquid in the reactor with a gas sensing unit, performing signal conversion and display, determining microbial activity value in the sample. The invention realizes fast sample detection and high detection accuracy.

Method for preparing small expended and vitrified ball with reinforcing layer coated on surface

Method for preparing small expended and vitrified ball with reinforcing layer coated on surface

The invention relates to a method for preparing a small expended and vitrified ball with a reinforcing layer coated on the surface. By combining the advantages of the small expended and vitrified ball and a thermosetting polymer material, the small expended and vitrified ball with the reinforcing layer coated on the surface is prepared by forming an insoluble and infusible high molecular protective film on the surface of the small expended and vitrified ball through the crosslinking and solidification of thermosetting resin. The strength and the heat-preservation and heat-insulating performance of the small expended and vitrified ball with the reinforcing layer coated on the surface are improved, the problems that the small expended and vitrified ball is easy to crack in use and the like are reduced, and meanwhile, the water absorption rate of the small expended and vitrified ball is reduced greatly. The method has the advantages that the preparation process is simple, the small expended ...

Yeast strain capable of producing acidic alpha-amylase and fermenting enzyme production method thereof

The invention provides a yeast strain capable of producing acidic alpha-amylase and a fermenting enzyme production method thereof, and belongs to the technical field of biological engineering. The strain is Rhodotorula sp. SH3 which is autonomously separated from soil; the strain is collected in the China General Microbiological Culture Collection Center (CGMCC), and the collection number is CGMCC No.10503; the 18S ITs sequence of the strain is submitted to a GenBank database, and an accession number is KM875707. The conditions of the strain on producing the acidic alpha-amylase are as follows: optimal carbon source soluble starch is 15 g/L, optimal nitrogen source peptone is 30 g/L, the optimum temperature is 37 DEG C, the optimum pH value is 4.5, and the enzymatic activity of the acidic alpha-amylase is 96.8 U/mg under the conditions. The produced acidic alpha-amylase reaches the optimum operation pH value of 5.0, the tolerated pH range between 3.8 and 8.0 and the optimum operation temperature ...

对散装农作物储藏中的微生物进行检测处理的方法

Samples are taken from three layers: upper, middle and lower in at least 5 points per 10 m2 by using pointed metal tube. Quick microbe detector analyzes judgment of detection. Multifunctional processing device lets ozone into unqualified points. Judgment of detection is operated again. The said procedure is repeated till microbial activity in samples is lower than 200 active units. Features of the invention are: short operation time, small energy consumption.