40results about How to "Change thermal stability" patented technology

The invention relates to a self-assembly method of inorganic nano particle hybridization organic membrane. The method comprises steps of: respectively dissolving polycation and polyanion in a dissolvent, preparing to form a membrane casting solution, standing and defoaming; adding inorganic nano particle into a polyanion solution to prepare a polymer nano particle solution; soaking or dynamically filtering polyanion nano particle solution or polycation solution on the surface of a substrate or basal membrane for 10 to 60 minutes to form a thin membrane layer. The substrate or the basal membrane is soaked or dynamically filtered in the polycation solution or polyanion nano particle solution for 10 to 60 minutes; the polyanion nano particle solution reacts with the polycation to form the thin membrane layer; the substrate or the basal membrane is soaked in deionized water, and the membrane surface is rinsed and dried. When the polycation or the polyanion nano particle solution is filtered on the basal membrane, the transmembrane differential pressure thereof is 0.01 to 0.3MPa or minus 0.02 to minus 0.09MPa. The membrane forming method is simple; the thin membrane prepared on the substrate is compact and uniform; the membrane formed on the basal membrane has excellent penetration and vaporization separating property and mechanical strength.

The invention discloses a plastic weaving bag production process and relates to the field of packing materials. The process comprises five technological processes of raw material burdening, mixing, drawing, weaving, printing-cutting and sewing. In the process method, raw material proportions in the raw material burdening process are reasonable, the performances of all the raw materials are fully played, the combined performances are greatly improved, a filling master batch adopts nano-calcium carbonate, and the mechanical properties and stability of the materials are improved; by reasonably controlling the parameters such as temperature, time and retraction ratio in the drawing process, manufactured ribbon-like filaments are excellent in quality and good in mechanical properties without being easily broken, and massive electric energy is saved by adopting a cam-combined energy-saving winding machine for winding and molding; after all steps of the weaving process, yarns are uniformly arrayed with less crossing and twisting, and a cloth surface has no wrinkles and is more attractive and reasonable in density; by reasonably controlling the needle pitch in the sewing process, the sewing direction strength of a weaving bag is high and the weaving bag has good falling performance.

The invention discloses a microwave modification method of plant fiber and application thereof. The method comprises the steps of: firstly smashing the plant fiber; preprocessing the smashed plant fiber with coupling agent; and processing the preprocessed plant fiber by means of microwave radiation, so that the coupling agent is grafted at the surface of the plant fiber to obtain the microwave-modified plant fiber, wherein the microwave-modified plant fiber can be used as filling material of composite material for the field of high molecular material. The modification method is environment-friendly, and has no pollution, low production cost and remarkable economic benefit; and the microwave-modified plant fiber has obvious polarity change, wherein the nonpolarity is obviously enlarged, thereby obviously improving the interface consistency with non-polarity high molecule substances and improving the combination property of the composite material.

The invention relates to an application of carbon nanometer tube in polythene fiber composite weft-free cloth, wherein the nanometer particles are two-dimension nanometer carbon tube, as seamless hollow tube surrounded by hexagon carbon atom grid, whose two ends are covered by hemi-spherical large Furehee molecules, while the diameter is from zero-point nanometer to tens nanometers and the length is from several micrometers to hundreds micrometers. And the production comprises that (1) pretreatment of carbon nanometer tube as purifying and organic treatment that refluxing 1-4g carbon nanometer tube/ml and 0.01-0.04g/ml titanic acid coupler in organic solvent for 1-3h, (2) mixing carbon nanometer tube and adhesive for 1-2h at 60-80Deg. C, and defoaming at vacuum, (3) uniformly laying strengthener UHMWPE fiber on a coiler, (4) plating adhesive for 1-2 times and drying at 40-70Deg. C, (5) drying at 60+-3Deg. C for 10-20min. The invention can increase the application temperature of polythene fiber composite weft-free cloth as 10Deg. C, and improve 20% of impact resistance, with better thermal resistance, strength and creep resistance, or the like.

The invention discloses an exo-inulinase mutant MutDP121ET6 with improved low-temperature activity. The mutant MutDP121ET6 has an amino acid sequence as shown in SEQ ID NO. 1. Compared with a wild enzyme InuAMN8, the thermal activity and the thermal stability of the mutant enzyme MutDP121ET6 are changed, the mutant enzyme MutDP121ET6 has higher activity at low temperature, reduction of the thermal stability and improvement of the low-temperature activity are beneficial to reduction of the use amount of the enzyme or shortening of the reaction time during low-temperature reaction, and deterioration of the thermal stability is beneficial to control of the reaction process of the enzyme through thermal treatment. After treatment at 55 DEG C, the enzyme activity of the wild enzyme InuAMN8 is reduced from 70% to 17%, and the enzyme activity of the mutant enzyme MutDP121ET6 is reduced from 74% to 8%. The low-temperature exo-inulinase mutant MutDP121ET6 disclosed by the invention can be applied to the industries of food, wine brewing, washing and the like.

The invention belongs to the chemical synthesis field and particularly relates to a soluble elemental sulfur and alicyclic olefin copolymer and a preparation method thereof. Elemental sulfur is heated in the nitrogen atmosphere under the condition that a catalyst exists or does not exist until the temperature of a reaction system is above a melting point of the elemental sulfur and below the transformation temperature, an alicyclic olefin monomer is added to be stirred and uniformly mixed after the elemental sulfur is completely molten, a polymerization reaction is performed, and the soluble elemental sulfur and alicyclic olefin copolymer is obtained. According to the soluble elemental sulfur and alicyclic olefin copolymer, a carbon chain is introduced into a sulfur chain and accordingly sulfur free radicals are eliminated, the effect of a chemical crosslinking point can be achieved due to the fact that unsaturated olefin comprises more than one double-bond, and accordingly the effect of the sulfur chain stabilization can be achieved.

The invention discloses a low-temperature exoinulinase mutant MutP126R stable at medium temperature, the mutant MutP126R has an amino acid sequence as shown in SEQ ID NO.1, the thermal activity and thermal stability of the mutant MutP126R are changed, the optimal temperature is increased, the thermal stability is better, and the mutant MutP126R is beneficial to production, storage, transportation and the like of enzymes. The optimum temperature of the purified wild enzyme InuAMN8 is 35 DEG C, and the optimum temperature of the mutant enzyme MutP126R is 40 DEG C; after the wild enzyme InuAMN8 is treated at 55 DEG C for 10-60 minutes, the enzyme activity of the wild enzyme InuAMN8 is reduced from 70% to 17%, and the enzyme activity of the mutant enzyme MutP126R is reduced from 70% to 26%. The low-temperature excision inulase mutant MutP126R disclosed by the invention can be applied to the industries of food, wine brewing, biological energy and the like.

The invention belongs to the field of bulletproof protective products and relates to a preparation method of white carbon black enhanced UHMWPE (ultrahigh molecular weight polyethylene) fiber composite non-weft fabric. The preparation method includes: pretreating white carbon black; further functionally modifying the pretreated white carbon black to allow the white carbon black to be dispersed evenly in matrix adhesives; well mixing the functionally modified white carbon black with the adhesives; sizing the UHMWPE fiber; and drying. By adding gas phase white carbon black, energy caused bullet impact on fibers can be absorbed more, bulletproof performance is improved, and overall heat resistance is improved. Live ammunition tests applied to a certain layers of the composite non-weft fabric according to the GA141-2001 standard shows the composite non-weft fabric completely accords to the requirements of the standard, use temperature is increased by 5 DEG C, and impact resistance is increased by about 20%.

The invention discloses a selenium-containing maleimide polymer as well as a preparation method and application thereof and belongs to the technical field of polymer materials. The selenium-containingmaleimide polymer with various refractive indexes is obtained through carrying out active free radical polymerization on a synthesized selenium-containing maleimide monomer with a novel structure anda styrene monomer at different mol ratios; and the refractive index is the greatest when the mol ratio of the two monomers is 1 to 1 and the refractive index value is 1.69 when the wavelength is 633nm. Compared with oxygen and sulfur substituted polymers with the same structure, the refractive index is remarkably improved. Furthermore, the styrene monomer is changed into a synthesized novel selenium-containing vinyl monomer and then the synthesized novel selenium-containing vinyl monomer is copolymerized with selenium-containing maleimide, so that the refractive index value of the obtained polymer is further improved on the basis of 1.69 and reaches 1.87 when the wavelength is 633nm. By adopting the selenium-containing maleimide polymer, the defects that the thermal stability is poor andthe molecular weight cannot be controlled are overcome; and the refractive index is controllably adjusted so that the application of the selenium-containing maleimide polymer in the optical field is expanded.

The invention provides a genetic modification method for changing thermal stability of an envelope virus, a recombinant virus and an application of the recombinant virus. The method comprises the following steps: comparing multiple sequences of enveloped viruses to obtain amino acid mutation which obviously influences an adsorptive protein charge value of a virus strain to be modified; analyzing the change value of the amino acid mutation to the adsorbed protein charge, and screening an amino acid mutation combination capable of remarkably increasing or reducing the adsorbed protein charge; applying the genetic manipulation technology of the virus, performing mutation modification on the envelope virus at the transcription plasmid level, and saving and obtaining the recombinant envelope virus subjected to heat-resistant modification. According to the invention, the heat-resistant characteristic of the envelope virus is obviously changed in an artificial mutation mode for the first time. The method can be widely applied to heat-resistant transformation of envelope virus vaccine strains, and has a wide application prospect in the aspect of research and development of heat-resistant, safe and efficient envelope virus vaccines.

The invention discloses high-temperature-resistant waterproof epoxy asphalt and a preparation method thereof. The high-temperature-resistant waterproof epoxy asphalt is prepared from the following raw materials in parts by weight: 40-50 parts of asphalt, 5-10 parts of concrete, 20-30 parts of bisphenol A epoxy resin, 5-7 parts of higher aliphatic amine, 1-2 parts of acrylonitrile, 0.2-0.4 part of epoxy chloropropane, 3-4 parts of hyper-branched polyester, 1-2 parts of an antioxidant, 2-3 parts of a filler and 0.1-0.2 part of a dispersing agent, wherein the filler is a mixture of talcum powder, diatomite and mica powder, and the higher aliphatic amine is one or more of octadecyl amine and dodecyl amine. The bisphenol A epoxy resin and the asphalt are mixed, a three-dimensional interpenetrating network structure polymer can be formed, the adhesive force, the tensile strength and the thermal stability of the product can be fundamentally changed, hyper-branched polyester is added, the asphalt is subjected to toughening modification, the problem of poor compatibility can be avoided, and the tensile strength of the product at low temperature can be improved.