110results about How to "Chemical bond stability" patented technology

The invention discloses a graphene-containing insulated radiating composition and preparation and application thereof. The composition comprises the components of silica-coating graphene, insulated heat-conducting filler, a surface treating agent, and a function additive. The preparation method comprises the following steps of: hydrolyzing ethyl silicate on the graphene surface by the sol-gel method to obtain graphene coated with a silica film on the surface; adding the surface treating agent to a mixture of the insulated heat-conducting filler and modified graphene; uniformly agitating; then adding the function additive; and uniformly dispersing to obtain the insulated radiating composition. The composition has the advantages that the graphene is processed by insulating and coating, and the insulated heat-conducting filler and additive of other forms are coordinately added, thus the composition shows high radiating improvement effect in the plastic cement and coating fields; and the composition can be widely applied to a heating element and a radiating facility of various electronic products and electrical equipment, and can greatly improve the radiating effect as well as prolong the service life of devices.

The invention relates to a hand-care disposable disinfection gel and a preparation method thereof. The hand-care disposable disinfection gel comprises ethanol, a bactericide, a cosolvent, a thickener, an emollient, essence and a PH regulator, wherein the essence is used as a carrier to cover pungent odor of ethanol. The hand-care disposable disinfection gel has the advantages of being bactericidal, washing-free, not sticky and greasy, and comfortable in smell, and caring hands. The preparation method comprises the following steps: the thickener swells in purified water fully to prepare a liquid A; meanwhile, the bactericide and the cosolvent are added in ethanol to be mixed uniformly to prepare a liquid B; then, the liquid B is poured into the liquid A; the emollient and the essence are poured in the liquid A, after purified water is supplemented to be sufficient, the PH regulator is added to regulate the PH value to 6.0-8.0, and the uniform mixing is performed.

The invention relates to a method for preparing a black polyurethane elastic fiber via in situ polymerization, comprising the following steps: (1) evenly dispersing nanometer carbon black particles in low-polymer polyhydric alcohol by using a grinding or ultrasonic and powerful mechanical stirring method so as to form a stable mixture, (2) adding diisocyanate in the polyhydric alcohol containing the carbon black particles for full reaction and adding a solvent for full dissolution to obtain NCO end capped prepolymer polyurethane formic ether solution; (3) carrying out chain extension and chain termination on the prepolymer solution by using mixed amine solution to generate polyurethane urea solution, and (4) curing the polyurethane urea solution and spinning the polyurethane urea solution into the black polyurethane elastic fiber by means of a dry spinning system. The polyurethane elastic fiber prepared via an in situ polymerization method is lasting in black effect and high in color fastness, so that the subsequent processing is free of dyeing; and at the same time, the polyurethane elastic fiber has relatively good mechanical property.

The invention relates to a click chemistry-based cotton fabric durable anti-crease finishing method. The click chemistry-based cotton fabric durable anti-crease finishing method comprises the following steps: putting coarsened cotton fabric into a 3-thiopropyl triethoxy silane solution and performing sulfydryl modification to obtain sulfydryl modified cotton fabric; ultrasonically mixing photocurable waterborne polyurethane acrylate, sulfydryl silane and a photoinitiator to obtain finishing liquid; dipping the sulfydryl modified cotton fabric into the finishing liquid and performing ultraviolet curing to obtain the durable anti-crease cotton fabric. The method provided by the invention is simple in operation, high in efficiency, energy-saving and environmentally friendly; after finishing is conducted, the anti-crease effect is remarkable, the durability is high, and the influence on the whiteness of the fabric is little. After the cotton fabric is finished by the anti-crease process, the wearability can be improved, the application field can be enlarged, and the requirements of people on flat appearance and wear comfortability of clothes can be met.

The invention relates to a solvent-free electrostatic conducting anti-corrosive coating for oil tanks and the preparation method thereof. The solvent-free electrostatic conducting anti-corrosive coating comprises a solution A prepared from bisphenol A type liquid-state epoxy resin, epoxy-containing polyol ether, titanium dioxide, precipitated barium sulfate, talcum powder, acidic polyester and polyamide, fluorocarbon-modified siloxane, polyacrylate-modified fluorocarbon polymer, poly-carboxylate, light-colored conductive powder and alkanolamine solution of unsaturated acidic carboxylate, and a solution B prepared from polyamide resin, N,N-dimethyl benzyl amine and poly-carboxylate. When in use, the solution A and the solution are mixed and solidified to form a coating. The solvent-free electrostatic conducting anti-corrosive coating has constructability and storage stability similar to those of solvent electrostatic conducting coatings, and no discharge of volatile organic solvent in the production and the construction process. The coating has the advantages of good electrostatic conductivity, high chemical resistance and good oil resistance, and can be applied to steel surfaces of different parts in the oil tanks, such as bottom plates, inner walls, floating cabins, floating roofs and pillars, to prevent corrosion.

The invention relates to the technical field of composite material preparation, in particular to a 3D printed grid ceramic reinforced resin composite material and a preparation method thereof. The 3Dprinted grid ceramic reinforced resin composite material is composed of three parts including grid ceramic, resin and an additive dispersed in the resin, and the grid ceramic is obtained by mixing aluminum ash and ceramic powder, carrying out molding through a 3D printer and carrying out drying and sintering, pores of the grid ceramic are filled with the resin and the additive contains a diluent and a curing agent. The preparation method of the 3D printed grid ceramic reinforced resin composite material has the following advantages: (1) the composite material is excellent in heat-conducting property, simple in preparation process and lower in cost, and (2) the pores of the grid ceramic reinforcement are easy to adjust, are continuous as a whole, the grid ceramic reinforcement is firmly combined with matrix resin, the strength is high, the toughness is good, the impact resistance is realized, and the use reliability and service life of the material are improved.

The invention discloses a method for quickly preparing a silicon dioxide / wood composite material. The method comprises the steps as follows: (1) pretreatment of wood; (2) preparation of a silicon-containing precursor solution; (3) impregnation of the wood with the silicon-containing precursor solution through ultrasonic vibration; (4) ageing; and (5) drying. According to the method, the quick impregnation of the wood with the silicon-containing precursor solution in a sol-gel method process is realized through the ultrasonic vibration, the production technology is simple and quick, a lot of time is saved, the manufacturing cost is low, the quality is stable, and most of nano silicon dioxide can be deposited on cell walls of the wood and cell cavities can be filled with part of the nano silicon dioxide in the form of gel in a short time; the heat stability, the hygroscopicity and the waterproofness of the wood are significantly improved while environmental characteristics of the wood are maintained to the maximum extent, and mechanical properties and the dimensional stability are greatly improved, so that the wood with the soft texture can be used for preparing interior decorations and furniture materials and has the broad development prospect.

The invention relates to boron and silicon-containing asphalt and a preparation method thereof. The invention adopts a technical scheme that: the preparation method comprises the followings steps of: dissolving asphalt in toluene, keeping the temperature of between 40 and 90 DEG C for 4 to 10 hours, centrifuging and filtering to remove undissolved substances, distilling the solution at the temperature of between 110 and 150 DEG C to remove the toluene, and drying the residue to prepare an asphalt and toluene soluble substance; mixing 1 to 10 weight percent of organic boron, 30 to 60 weight percent of organic silicon and 30 to 69 weight percent of asphalt and toluene soluble substance, adding a solvent accounting for 50 to 80 weight percent of the mixture, and uniformly stirring; keeping the temperature of between 100 and 300 DEG C for 2 to 10 hours, and distilling at the temperature of between 80 and 120 DEG C to remove the solvent to obtain the synthesized product; and keeping the temperature of the synthesized product at the temperature of between 130 and 180 DEG C for 24 hours to obtain the boron and silicon-containing asphalt. The boron and silicon-containing asphalt has the characteristics of readily available raw materials, low reaction temperature and simple operation, and can be used as a binding agent and an impregnant; and carbonized products after high temperature treatment have good oxidation resistance at a high temperature.

The invention relates to a rigid plastic bridge. The rigid plastic bridge comprises a shell, wherein the shell comprises following components in parts by weight: 90-110 parts of PVC (polyvinyl chloride) resin, 3-6 parts of chlorinated polyethylene (CPE), 1-3 parts of impact modifier ACR, 5-7 parts of thermal stabilizer, 0.5-1.2 parts of soybean oil, 0.5-1.5 parts of stearic acid, 0.3-1.2 parts of paraffin, 1.5-3 parts of titanium dioxide, 0.6-1.2 parts of PE (polyethylene) wax, and 30-50 parts of calcium carbonate. The rigid plastic bridge is improved in strength and is greatly improved in water resistance, resistance to acid, base and salt, and related characteristics, is environment-friendly, energy-saving and pollution-free, and has good flame resistance.

The invention discloses a super-wear-resistant self-cleaning coating which comprises first elastic finish coat and second self-cleaning finish coat. The first elastic finish coat comprises, by mass, 10-60 parts of two-functionality-degree polyurethane acrylic resin A, 2-7 parts of an initiator A, 10-60 parts of an acrylate monomer A and 3-40 parts of an additive A. The second self-cleaning finishcoat comprises, by mass, 2-30 parts of acrylic acid-modified organic silicon resin with inorganic powder affinity, 0.3-3 parts of high-hardness powder particles, 2-20 parts of two-functionality-degreepolyurethane acrylic resin B, 10-40 parts of multi-functionality-degree polyurethane acrylic resin B, 15-45 parts of an acrylate monomer B, 2-7 parts of an initiator B, 3-40 parts of an additive B. The invention further discloses a preparing method of the super-wear-resistant self-cleaning coating. The super-wear-resistant self-cleaning coating has the performance of super wear resistance, scratching resistance and surface abrasion resistance and has the advantage of long-acting self-cleaning.

The invention relates to a modified chlorosulfonated polyethylene rubber coating used for steel storage tanks and a preparation method thereof. The coating comprises a component A and a component B, wherein the component A is composed of chlorosulfonated polyethylene rubber, dimethylbenzene, trimethylbenzene, titanium white powder, talc powder, fluorocarbon-modified polyacrylamide and organic bentonite; and the component B is composed of bisphenol-A epoxy resin, dimethylbenzene, n-butanol, diphenyl guanidine (manufactured by Dongbei Auxiliary general factory, Shenyang) and ethylenethiourea. The component A and the component B are mixed and cured to form a coating film before application. The coating is excellent in physical property, chemical resistance, salt spray resistance and light fastness, and can be used for the surface protection and coating of steel storage tanks in various corrosive environments.

The invention discloses a production process for formaldehyde-free multiply plywood. The production process mainly includes the following steps of cold plasma processing, double-sided gluing of single boards, assembly, hot-press molding, contact calibrating, gluing and veneering, veneer hot pressing, edge sawing, sanding and finished product obtaining. According to the production process, under a high-temperature hot-pressing action of the boards, after isocyanate modified soy protein adhesive is unblocked, the activity of -NCO radials of isocyanate is recovered, and the -NCO radials carry out a cross-linking reaction with degraded soy protein and wood, so that a uniform space mesh structure is formed, the cohesion strength is improved, formation of stable chemical bonds on the surface of the soy protein and the surface of the wood can be facilitated, and thus water resistance of the soy protein based adhesive is improved.

The invention discloses an oligomer compound, a hydrophobic composition, a preparation method of the oligomer compound, and a use of the oligomer compound and the hydrophobic composition. The oligomer compound has a structural formula shown in the formula I. The invention further discloses the hydrophobic composition composed of the oligomer compound shown in the formula I and a use of the hydrophobic composition in improvement of water-resistance and water-isolation or scrubbing-resistance of an object. The hydrophobic composition can be used in water-resistant and water-isolating or scrubbing-resistant treatment on glass, textile fabrics, building materials or electronic products. A textile fabric treated by the hydrophobic composition has washing resistance and acid and alkali resistance. The hydrophobic composition does not influence a fabric handle and softness and has obvious effects of water-resistance and water-isolation. The hydrophobic composition can be used for preparation of a waterproof layer in a building, and can also be used for water-resistance and water-isolation treatment on building materials and electronic products.

Disclosed are a receptor-mediated quantum dot tracing targeted drug delivery system, a preparation method thereof and application. The targeted drug delivery system comprises polyethylene glycol, hyaluronic acid, quantum dots and melphalan complex which are abbreviated as PEG-HA-QDs-MEL. The PEG is connected with HA amide in a dewatered and condensed manner, the water-soluble CdTe / CdS quantum dots are connected into the HA, and finally, the PEG, the HA and the QDs are prepared with the MEL complex to obtain the targeted drug delivery system. The component content of the PEG-HA-QDs-MEL includes, by weight, 30-100 parts of the MEL, 600-1500 parts of the PEG, 200-500 parts of the HA, 5-50 parts of the CdTe / CdS quantum dots, 20-50 parts of DCC (dicyclohexylcarbodiimide), 1-10 parts of DMAP (dimethylamino-pyridine), 100-500 parts of succinic anhydride, 20-50 parts of NHS, 20-50 parts of EDC (carbodiimide) and 10-100 parts of sodium bisulfite. The targeted drug delivery system is applied to preparing antitumor drugs.

The invention provides an His-tagged recombinant protein immunoaffinity purification and enrichment column capable of efficiently and specifically enriching hexahistidine-tagged protein and a preparation method and application thereof. The provided immunoaffinity purification and enrichment column comprises an activated agarose filler coupled with an immunoaffinity-purified His-specific polyclonal antibody and a plastic column loaded with the immunoaffinity filler, wherein the His-specific polyclonal antibody coupled with the immunoaffinity filler is extracted by an immunoaffinity method. The immunoaffinity purification and enrichment column is prepared by loading the immunoaffinity filler into the special plastic column; and the immunoaffinity purification and enrichment column is high in efficiency and strong in specificity while enriching His-tagged recombinant protein, is mild in diluting conditions, can be repeatedly utilized and is an ideal material for separating, purifying and enriching the His-tagged recombinant protein.

The invention discloses a preparation method of a fluorinated organic nanoparticle-containing polyamide solvent-resistant nanofiltration membrane. Polyamine, dopamine and a fluoroalkyl mercaptan compound are used as reactive monomers, fluorinated organic nanoparticles are formed through Michael addition and Schiff base reaction, and then the fluorinated organic nanoparticles and polybasic acyl chloride form the polyamide membrane containing the fluorinated organic nanoparticles on the surface of the porous support membrane through interfacial polymerization reaction. The characteristic of lowsurface energy of the fluorinated organic nanoparticles is utilized, the interface polymerization process is regulated and controlled; the chemical composition, the microstructure and the hydrophilicity and the hydrophobicity of the polyamide separation layer are optimized, the polyamide solvent-resistant nanofiltration membrane having the unique pore channel structure is obtained, the prepared membrane has characteristics of high separation selectivity and high solvent permeation flux, the membrane preparation method is simple, easy to regulate and control, and the good industrial applicationprospect is provided.

The invention discloses a preparation method of a wood / nano titanium dioxide composite material. The preparation method of the wood / nano titanium dioxide composite material comprises the following steps: (1) preparing a titanium sol solution; (2) placing wood into the titanium sol solution, and carrying out ultrasonic vibration impregnation or vacuum pressurization impregnation; (3) aging and drying the wet wood after impregnation, thereby obtaining the wood / nano titanium dioxide composite material. According to the invention, the wood / nano titanium dioxide composite material is prepared by adopting an ultrasonic vibration impregnation sol-gel method or a vacuum pressurization impregnation sol-gel method; the preparation method is simple in process, saves time, is low in cost, and is extremely high in stability; titanium sol can permeate into the inside of wood, and the thermal stability, the hygroscopicity and antibacterial property of the wood / nano titanium dioxide composite material are improved obviously; meanwhile, the intensity and the hardness are improved greatly; the preparation method of the wood / nano titanium dioxide composite material can be applied to environments with high humidity and temperature change.

The invention discloses a high-voltage lithium nickel-cobalt manganate cathode material and a preparation method thereof. The lithium nickel-cobalt manganate cathode material is lithium nickel-cobaltmanganate doping material coated with the phosphate, the lithium nickel-cobalt manganate doping material means that the lithium nickel-cobalt manganate doping material is doped with a lanthanum element and a fluorine element; the phosphate is prepared by mixing the aluminum phosphate and diammonium phosphate aqueous solution. The doping of the lanthanum element and the fluorine element can increase the interplanar spacing so as to promote the lithium ion migration and improving the structure stability; the material surface has good lithium ion conductivity feature and a certain electronic conductivity feature by coating the phosphate on the surface, so that the material has higher lithium-removing state stability under high voltage; the residual lithium quantity of the material surface isreduced, the surface side reaction is inhibited, and the structure stability and the cycle performance of the material under high voltage are obviously improved.

The invention provides polyurethane foam and modified graphene and preparation methods thereof and belongs to the field of packaging materials. The polyurethane foam is prepared through mixing and foaming of a white material and a black material. The raw materials of the white material include the modified graphene. The preparation method of the modified graphene includes the steps that graphene oxide and a foam stabilizer are reacted, and then mixed reaction with a reducing agent is performed, wherein the foam stabilizer is a polysiloxane-polyoxyalkylene copolymer. The preparation method of the polyurethane foam includes the steps that the modified graphene is prepared; components in the raw materials are mixed according to parts by weight, and the white material is obtained; and the white material and the black material which are equal in mass are mixed and foamed. The graphene is firmly connected to a molecular backbone of polyurethane, so that the strength and the buffering property of the polyurethane foam are better.

The invention discloses an elastomeric product for modifying common soil and a production method thereof. The production method comprises the steps of: removing impurities in soil, drying, crushing and screening to obtain soil particles; then dynamically heating common soil particles, adding a surface modifying agent, drying to obtain modified soil, wherein the surface modifying agent comprises a coupling agent, polyorganosiloxane with reactive functional groups, organosilicon, fatty amine emulsifying bodies and water; and finally, preparing an elastic runway surface layer, a sports ground floor, synthetic leather, household and commercial floors, household and commercial wall decorating materials and the like by using the modified soil and crylic acid cementing agents as main components and doping with a compound prepared by a cross-linking agent, a softening agent, the coupling agent, a foaming agent or defoaming agent and the like. The product has no toxic and harmful gas volatilization in the whole production and use processes, has compression deformation ratio, rebound resilience and durability reaching or exceeding properties of rubber or some plastics, and is an elastic plane material with low cost, high performance and environment protection.

The invention discloses a bipolar head prosthesis, which comprises a big head, a ball head and a locking ring, wherein the big head is of a cup-shaped spherical structure; a cavity for arranging femoral components is arranged in the ball head; the ball head is put in the big head; the outer wall of the ball head is close to the inner wall of the big head; and the inner wall at the opening part of the big head is locked with the outer wall of the ball head through the locking ring. The bipolar head prosthesis is simple in structure, is not easy to dislocate, can be implanted stably and convenient in operation, is favorable to reducing the abrasion and prolonging the service life, enables the moving range of a hip joint to be increased, and is more practical.

The invention relates to the field of steel rail flash welding, in particular to a movable steel rail flash welding machine driven by a large-power energy storage power supply device. The movable steel rail flash welding machine comprises a welding machine, welding machine auxiliary equipment and the power supply device. The power supply device comprises a battery set power supply part and a super-capacitor set power supply part. The battery set power supply part supplies power to the welding machine auxiliary equipment and the super-capacitor set power supply part. The super-capacitor set power supply part supplies power to the welding machine. During preparation before welding, the battery set power supply part continuously supplies power to an auxiliary system so that preparation conditions before welding can be met, and the battery set power supply part charges the super-capacitor set power supply part. When welding is needed, the super-capacitor set power supply part supplies power to the welding machine. A battery set and a super-capacitor set are matched, under the situation that load fluctuation is large, the battery set high-strength power supply probability is obviously reduced, the energy density of a power source can be improved, and meanwhile the peak current requirement is met.

The invention relates to a preparation method of flesh-colored spandex. The preparation method comprises the following steps: in a pre-polymerization tank, sequentially adding DMAC and polytetramethylene ether glycol PTMG, then adding 4,4-diphenylmethane diisocyanate 4,4-MDI according to the set NCO / OH ratio, and performing full pre-polymerization reaction; after the reaction is over, adding the prepared pigment solution, and stirring to obtain a low-polymer solution in which pigment is uniformly distributed; and transferring a polymerized product into a chain extension tank, stirring to be even, controlling to dropwise add a mixed amine DMAC solution at low temperature so as to perform chain propagation and chain termination to finally obtain polyurethane urea solution, wherein the mixed amine DMAC contains a diamine chain extender and a monoamines termination agent; then adding an antioxidant, a lubricant, a delustrant, an ultraviolet absorbent and the like, stirring and dispersing; and finally, by virtue of dry spinning system, performing spinneret drawing, high-temperature drying, oiling of an oil agent, winding and forming to pigment-containing polyurethane urea stock solution, so as to obtain flesh-colored spandex.

The present invention discloses a modified polyvinyl alcohol adhesive for plywood and relates to the technical field of plywood. The modified polyvinyl alcohol adhesive for the plywood is made of thefollowing components: starch composite modified polyvinyl alcohol, activated nano zeolite powder, rosin resin, hydroxymethyl cellulose, dehydrated sorbitol fatty acid ester and deionized water. The provided adhesive for the plywood has good water resistance and at the same time has a quick drying effect.

The invention discloses a real silk flame retardant and a method for preparing a flame-retardant real silk. The structural formula of the real silk flame retardant is shown as the accompanying drawing, wherein, R is H or CH3, and n is 1 or 2. The flame retardant which is 50%-100% of the weight of a real silk fabric is added into water which is 20-30 times of the fabric, a persulphate initiator which is 1.5%-3.5% of the flame retardant is added, the pH value is regulated between 3-4, so the flame retardant solution is obtained; the real silk fabric is soaked in the flame retardant solution, is heated to 85 DEG C-90 DEGC, and is thermally insulated for 40-60 min; and after washing and drying, the flame-retardant real silk is obtained. The flame retardant provided by the invention has durability, and no formaldehyde is released during the flame-retardant finishing, so the environmental protection requirement is satisfied.

The invention discloses an embolism microsphere, a preparation method thereof and a drug-loaded embolism microsphere, and belongs to the field of medical materials. The preparation method of the embolism microspheres comprises the following steps: forming liquid drops from an aqueous solution containing a polyhydroxy polymer and a cross-linking agent under the electrostatic action, dripping the liquid drops into a collecting solution, dehydrating to obtain a microsphere primary product, and performing cross-linking reaction on the microsphere primary product to obtain the embolism microspheres. According to the preparation method, the size of the embolism microspheres can be accurately regulated and controlled within a proper range, and the prepared embolism microspheres can stably exist in water.

The invention provides a high-flame-retardant soft PVC coated polyester yarn high-molecular composite sun-shading material, which is synthesized by PVC resin powder, a flame retardant and other auxiliary materials, wherein the main raw materials of the flame retardant comprise phosphate ester, zinc stannite, metal hydroxide, decabromodiphenyl ethane and antimony trioxide, and simultaneously contain chlorinated polyvinyl chloride and chlorinated paraffin; the coated polyester fiber is woven into a sunlight fabric with high-flame-retardant performance, and the limiting oxygen index can exceed 32.0 %. The high-molecular composite sun-shading material can interact with a gas phase and a solid phase through the compound system, the flame retardancy of the soft PVC coated polyester yarn high-molecular composite sun-shading material is significantly improved, the limiting oxygen index of the material is 32. 4 %, the problem of low limiting oxygen index of the high-molecular composite sun-shading material is solved, the flame retardant efficiency of products is significantly improved, the fire risk of products is reduced, the products are more competitive, this innovation has made a breakthrough in the flame retardancy of soft polymers in the textile field.

The invention discloses a blood purifying adsorbent used for removing blood toxin and a preparation method, which employs 2-amino-5-methylpyridine as a ligand, and the ligand is fixed on a solid phase carrier through chemical coupling; a solid phase carrier material employs a porous microsphere form, and the glue holes permeate the molecular weight of 11,000-5,100,000. The invention discloses a preparation method of the blood purifying adsorbent used for removing blood toxin, which comprises the following steps: activating the solid phase carrier by an activator, the activator is chloropropylene oxide, epibromohydrib or N, N' carbonyl diimidazole; employing 2-amino-5-methylpyridine as the ligand, and fixing on the activated solid phase carrier through chemical coupling to obtain the blood purifying adsorbent. By using the blood purifying adsorbent, good adsorption capability are provided on IgG, IgM type antibodies and an immunization compound and a hydrophobic molecule beta2 microglobulin. The physical and chemical properties are stable, the blood purifying adsorbent has strong acid and alkali resistant and organic solvent resistance, and the cost is low.

The invention relates to a high-strength low-stretch chinlon 6 short fiber and a preparation method thereof. The method includes: spinning high-strength low-stretch chinlon 6 melt to prepare the high-strength low-stretch chinlon 6 short fiber, wherein the high-strength low-stretch chinlon 6 is produced through a reinforcing powder surface chain propagation reaction, a ring-opening pre-polycondensation reaction, a final polycondensation reaction, and a tackifying reaction from a mixture, which is mainly composed of: caprolactam, the reinforcing powder coated with a catalyst, and water. The produced high-strength low-stretch chinlon 6 short fiber is 0.89-2.22 dtex in linear density, not less than 6.0 cN / dtex in breaking strength and not more than 45% in breaking elongation. The reinforcing powder can enhance mechanical performances of the chinlon 6 short fiber; by means of the reinforcing powder surface chain propagation reaction, the reinforcing powder can be dispersed completely in thefiber, so that the chinlon 6 short fiber has good mechanical performances, uniform strength distribution and high quality.

The invention relates to an external wall fireproof reflective heat-insulation inorganic coating material, which comprises a base material, a filler, an auxiliary agent and water, wherein the base material comprises, by weight, 15-20 parts of lithium silicate, 15-20 parts of nano long hydrocarbonyl silane modified silica sol, 4-6 parts of nano hydroxyl magnesium silicate and 2-5 parts of an aluminum dihydrogen phosphate aqueous solution, and the filler is prepared from the following components in parts by weight: 20 to 25 parts of IR-1000 near-infrared reflective titanium dioxide, 10 to 15 parts of wollastonite powder, 10 to 15 parts of talcum powder and 1 to 5 parts of nano titanium dioxide. The invention also discloses a preparation method of the external wall fireproof reflective heat-insulation inorganic coating material. The coating material has the advantages of being free of VOC, not prone to combustion, good in high temperature resistance, capable of achieving reflective heat-insulation, not prone to corrosion and resistant to mould.