64results about How to "Good low temperature stability" patented technology

The organosilicon-polyurethane foam encapsulating material is composed of a component A and a component B. The component A comprises sucrose initial polyether polyol, sorbitol initial polyether polyol, a water-containing alcohol amine foaming agent, a catalyst and a halogen-free flame retardant, and the component B comprises an NCO-terminated polysiloxane-polyurethane prepolymer, silicone oil and a diluent. Wherein the water-containing alcohol amine foaming agent comprises isopropyl alcohol di-sec-butyl alcohol amine, a mixture of isopropyl alcohol sec-butyl alcohol amine and water. The two-component encapsulating material is used for encapsulating a new energy battery module.

The invention relates to the technical field of organic silicon toughening agents, in particular to a long-chain alkyl modified organic silicon toughening agent and a preparation method thereof.The long-chain alkyl modified organic silicon toughening agent is prepared through sulfydryl double-bond reaction of vinyl silicone oil and long-chain alkyl mercaptan, organic silicon hydrolysis is conducted under a certain temperature condition to synthesize silicon emulsion, long-chain alkyl is preliminarily obtained, and the long-chain alkyl modified organic silicon toughening agent is prepared. Then dropwise adding a first mixed emulsion obtained by mixing an acrylate soft monomer, octadecyl methacrylate, a functional monomer, an emulsifier and an initiator, dropwise adding a second mixed emulsion obtained by mixing an acrylate hard monomer, a functional monomer, an emulsifier and an initiator, and carrying out emulsion copolymerization reaction to obtain a long-chain alkyl group again to form an interpenetrating network system; compared with the prior art, the weather resistance and temperature stability of a polymer are improved, the molecular weight of the polymer is greatly improved, the polymer has good toughness, the toughening effect on a plastic material, especially the low-temperature toughening effect, is greatly improved, and the dosage of a toughening agent in an alloy material can be reduced.

The invention belongs to the technical field of low-melting-point alloys, and provides a low-melting-point gallium-based liquid alloy and a preparation method and application thereof. The preparation raw materials of the gallium-based liquid alloy comprise gallium, indium, tin, zinc, bismuth, antimony, lead and rare earth metal with specific mass content. The rare earth metal comprises one or two of lanthanum, cerium and neodymium. A trace amount of one or two of lanthanum, cerium and neodymium is added into the gallium-based alloy, so that the purity of the alloy can be improved, the viscosity can be reduced, and the surface tension can be adjusted; by adjusting the formula of the alloy, the smelting time is shortened in the alloy smelting process stage, the efficiency is improved, the alloy cost is reduced, the alloy is more uniform macroscopically, the low-temperature stability of the alloy is further improved, and the alloy can be kept in a stable liquid state at the low temperature even 10 DEG C below zero and better meet the special climate requirements.

The invention relates to the technical field of methanation reaction catalysts, in particular to a supported catalyst for methanation of carbon dioxide and a preparation method thereof.According to the preparation method, firstly, a nickel-doped cerium dioxide carrier is prepared through a urea method, and then a metal nickel nano-catalyst is supported on the carrier through an impregnation method; the preparation process is simple, the operation repeatability is high, and the method is suitable for large-scale industrial production; according to the supported catalyst for methanation of carbon dioxide, provided by the invention, the nickel-doped improved cerium dioxide is adopted as the carrier, and the oxygen vacancy concentration in the cerium dioxide carrier is greatly improved through the nickel doping amount, so that the activation and conversion of CO2 are promoted, and the problems of low activity and poor stability of the existing nickel-based catalyst for methanation of CO2 are effectively solved.

The invention relates to the technical field of external medicine, and discloses a stable external medicine composition containing fluticasone propionate, which comprises the following components: 0.05% of fluticasone propionate; 10.00% of propylene glycol; 0.05% of triethanolamine; 0.20% of imidazolidinyl urea; 0.8% to 1.2% of carbomer; 5%-20% of paraffin; 0.75% of poly (simtrol); 5.00% of isopropyl myristate; and the balance of purified water. Carbomer is added into the stable external pharmaceutical composition containing fluticasone propionate to replace octadecanol in an original formula, so that the high-temperature stability of fluticasone propionate cream is improved in the preparation and optimization process of the fluticasone propionate cream, and the molecular structure of the Carbomer can be matched with other components in the cream, so that the stability of the fluticasone propionate cream is improved. For example, grease phase molecules and water phase molecules form more stable interaction, at high temperature, grease molecules can be effectively prevented from being excessively gathered due to thermal motion, meanwhile, the stability of the water phase can be enhanced, and water is prevented from being separated out of a cream system.

The invention discloses a microemulsion containing 15% of fine glufosinate-ammonium, quizalofop-p-ethyl and fluoroglycofen-ethyl and a preparation process thereof, and the microemulsion is prepared from the following raw materials in parts by mass: 90-110 parts of fine glufosinate-ammonium, 25-35 parts of fluoroglycofen-ethyl, 10-30 parts of quizalofop-p-ethyl, 15-20 parts of an organic solvent, 0.3-0.5 part of a defoaming agent, 3-5 parts of an ampholytic surfactant, 30-40 parts of a dispersing agent, 3-5 parts of an emulsifying agent and 20-40 parts of deionized water. The mass ratio of the fine glufosinate-ammonium to the fluoroglycofen-ethyl to the quizalofop-p-ethyl is 10: 3: 2; the microemulsion of the fine glufosinate-ammonium, fluoroglycofen-ethyl and quizalofop-p-ethyl prepared by the invention has the advantages of low temperature resistance, quick effect, small dosage, good environmental compatibility and the like, and also has the advantages of very good low-temperature stability, capability of keeping a true solution state for a long time, no layering and the like.

The invention discloses a preparation method and application of low-sensitization high-nutrition pea protein egg custard liquid. The preparation method comprises the following steps: (1) extracting pea protein A from a pea variety A; extracting pea protein B from the pea variety B; uniformly mixing the pea protein A and the pea protein B to obtain the low-sensitization high-nutrition pea protein; (2) performing compound modification on the low-sensitization high-nutrition pea protein to obtain modified low-sensitization high-nutrition pea protein; and (3) mixing and emulsifying the modified low-sensitization high-nutrition pea protein, calcium chloride, edible vegetable oil, edible polysaccharide and water to obtain the low-sensitization high-nutrition pea protein egg custard liquid. The pea protein egg custard liquid prepared by the preparation method disclosed by the invention can be kept uniform and stable after being stored at low temperature for a long time, and can be used as an egg substitute in the food field; the pea protein egg custard is used for preparing the pea protein egg custard, the formed egg custard is uniform in tissue structure, and the structure and the taste of the egg custard can be simulated to a certain extent.

The present invention relates to a method for recycling waste pavement asphalt, and specifically provides a method for recycling waste pavement asphalt without a regeneration agent. The recycling method uses crushed pavement asphalt milling material, new asphalt, new aggregate, and fiber that have been crushed and screened multiple times, controls the temperature of each reaction process and the way in which the new asphalt is introduced, realizes the use of a large amount of recycled asphalt pavement materials, and does not use a regeneration agent, effectively realizes the reuse of waste asphalt, reduces the cost of road maintenance or paving, and has high economic and environmental benefits.

The present invention relates to the technical field of gear oil, and more specifically, to a heavy-duty vehicle gear oil based on shape memory polymer, and a preparation method and application thereof. The heavy-duty vehicle gear oil, by weight, comprises the following raw materials: 50-80 parts of base oil, 5-10 parts of shape memory polyurethane, 5-10 parts of extreme pressure anti-wear agent, 1-3 parts of antioxidant, and 1-3 parts of metal corrosion inhibitor; the gear oil prepared by the present invention has excellent anti-wear performance, load-bearing capacity, and anti-foaming performance, can effectively prevent erosion or peeling of the gear surface, and solves the problems of poor lubricity of existing heavy-duty gear oil, easy oxidation and degradation at high temperature, and reduced fluidity at low temperature.

The invention provides a Pr6O11-SnO2-ZrO2 ternary composite oxide as well as a preparation method and application thereof, and relates to the technical field of catalyst carriers. The Pr6O11-SnO2-ZrO2 ternary composite oxide disclosed by the invention is prepared from the following raw materials in percentage by mass: 60%-80% of ZrO2, 10%-20% of SnO2 and 10%-20% of Pr6O11. According to the invention, by designing the composition ratio of the Pr6O11-SnO2-ZrO2 ternary composite oxide material, the structural stability of the Pr6O11-SnO2-ZrO2 ternary composite oxide is enhanced, and the Pr6O11-SnO2-ZrO2 ternary composite oxide plays a synergistic effect with the active component and the auxiliary agent, so that the low-temperature activity and high-temperature-resistant hydrothermal stability of the catalyst are improved.

The utility model discloses an InAs / GaSb superlattice medium / long wave double-color infrared detector based on an nBn structure, which belongs to the technical field of optoelectronic devices and comprises a GaSb substrate, a non-doped GaSb buffer layer, a 14ML InAs / 7ML GaSb superlattice Si doped layer, a 14ML InAs / 7ML GaSb superlattice unintentional doped layer, a 4ML InAs / 7ML GaSb superlattice unintentional doped layer, a 8ML InAs / 6ML GaSb superlattice unintentional doped layer and a 8ML InAs / 6ML GaSb superlattice Si doped layer which are sequentially arranged from bottom to top. The medium / long wave absorption layers of 14ML InAs / 7ML GaSb superlattices and 8ML InAs / 6ML GaSb superlattices are combined, so that high absorption efficiency and low crosstalk of medium / long wave band response are realized, and low dark current and wide temperature range working capability are realized.

The application discloses oily gel microbeads, a preparation method thereof, skin care products and application. The oily gel microbeads comprise polar oil 60-93%, oil phase gel 5-30%, low freezing point oil 2.5-20% and semi-solid oil 0.1-5%, % is the mass percentage of each component in the total mass of the gel microbeads; the polar oil is one or more of glyceryl tri(ethylhexanoate), white pool seed oil, isononyl isononanoate, dicaprylyl carbonate, diethylhexyl carbonate, C12-15 alcohol benzoate, isopropyl myristate, ethylhexyl stearate, ethylhexyl palmitate, castor seed oil, wheat germ oil, sunflower seed oil, wild soybean oil and coconut oil; the freezing point of the low freezing point oil is lower than-65 DEG C. The oily gel microbeads prepared by the application have good low-temperature stability, are spherical in shape, have good uniformity, are easy to spread and absorb, have strong skin adhesion, and have strong moisturizing and repairing functions.

This application relates to the field of refrigeration systems, disclosing a refrigeration oil, a working fluid composition for refrigeration machines, and a refrigeration system. By adding a specific type of surfactant, this application significantly reduces the surface tension of the refrigeration oil, improves its compatibility with refrigerants such as hydrofluorocarbons, and reduces oil film formation or oil residue in the refrigeration system. The refrigeration oil described in this application has suitable viscosity and solubility viscosity, meeting the normal operating requirements of the compressor, while also effectively inhibiting the formation of oil film on the heat exchanger surface, thereby improving heat exchange efficiency. Furthermore, this refrigeration oil has good lubricity, low-temperature fluidity, and thermochemical stability, which can promote the circulation of the refrigeration oil in the refrigeration system pipeline, improve oil return efficiency, and extend the compressor's service life.

The invention relates to a grain fiber-PVC (polyvinyl chloride) composite foamed sheet with a surface co-extrusion layer and a preparation method of the grain fiber-PVC composite foamed sheet. Comprising a middle foaming layer and a surface co-extrusion layer, and the middle foaming layer and the surface co-extrusion layer both comprise PVC resin and rice hull powder. The rare earth composite stabilizer is added, so that the environment-friendly function is achieved, the rare earth stabilizer further has the coupling, reinforcing and brightening functions in the PVC material, and in addition, the rare earth composite stabilizer can further adjust the decomposition temperature of the foaming agent and achieve the effects of toughening and capacity increasing; the foaming agent is prepared by compounding an AC foaming agent and an NC foaming agent, so that the extrusion rate can be increased, meanwhile, the dimensional deviation of the product is reduced, and the surface hardness can reach about Shore D hardness 80; the weight ratio of the rare earth compound stabilizer to the foaming agent to the foaming regulator is (1-5): (0.5-1.6): (3-9). Plasticization in the processing process can be promoted, and meanwhile, the mechanical property of the material is improved.

The application relates to the field of lubricating oil, and more particularly to a novel wind power gear oil compound and a preparation method thereof. The novel wind power gear oil compound comprises, in mass parts, at least the following raw materials: a base agent 60-80 parts, an oily agent 1-8 parts, an antioxidant 3-6 parts, an anti-wear agent 3-8 parts and an improver 4-10 parts. The application provides a novel wind power gear oil compound which can be directly used as a wind power gear lubricating oil or used as an additive of other lubricating oil systems, can effectively enhance the extreme pressure resistance, corrosion and rust resistance, low-temperature flow and stability of the lubricating oil under the guarantee of excellent lubricating wear resistance and weather resistance and aging resistance of the lubricating oil, and meets the performance requirements of more complex wind power speed-up gear boxes.

This invention belongs to the field of environmentally friendly fuel technology, specifically relating to a method for preparing a green, low-carbon, and highly efficient modified fuel for alcohol-hydrogen engines. This invention comprehensively improves fuel performance through a progressive synergistic architecture of a bio-methanol platform – an oxygen-containing combustion-promoting system – a stability barrier – and a low-energy-consumption blending path. Using bio-methanol as a base, it optimizes combustion by compounding with oxygen-containing components such as 2-MTHF and DMM / MF, achieving rapid ignition, emission reduction, and noise reduction. Phase behavior is regulated by isobutanol and polyether-modified silicon, achieving a reversible and stable phase without the need for high-HLB surfactants, preventing deposition and gas lock. A four-fold protective barrier is constructed using GMO and fluorinated silica polyethers, combined with antioxidant synergy to achieve corrosion resistance and aging resistance. The process adopts a sequential design of front-end purification – mid-stage two-phase construction – and end-stage static mixing, achieving low-energy homogenization and ensuring storage, transportation, and operational stability.

The present application provides a liquid skin cleanser composition filled in a foaming container, comprising: (A) an anionic surfactant including at least one selected from (a1) palmitate and (a2) stearate, (B) at least one cationic polymer selected from dimethyldiallyl ammonium chloride polymer and dimethyldiallyl ammonium chloride-acrylic acid copolymer, and (C) polyethylene glycol having an average molecular weight of 190 to 630, wherein the mass ratio [(A) / (C)] is 15 to 100.

The present invention provides a liquid crystal composition and a liquid crystal display device comprising the same, wherein the liquid crystal composition comprises at least one compound of general formula F, at least one compound of general formula I and at least one compound of general formula II. The liquid crystal composition of the present invention has a smaller rotational viscosity and a higher VHR (UV) while maintaining an appropriate clearing point, an appropriate optical anisotropy, an appropriate absolute value of dielectric anisotropy and an appropriate VHR (initial), so that the liquid crystal display device comprising the same has a faster response speed, better low temperature stability and higher reliability.

The present application relates to the technical field of curing glue paint, in particular to a preparation method of water-based single-component plastic paint. The water-based single-component plastic paint prepared by the present application overcomes the problems of poor environmental protection and difficult balance of comprehensive performance of paint film. The water-based single-component plastic paint is prepared by optimizing the preparation method and raw material system; the alicyclic isocyanate is selected and step-by-step reaction is combined with ring-opening epoxy resin, quercetin and disulfide to form a dense coating, so as to improve corrosion resistance and adhesion; hydrolyzed KH560 and polyurethane-polyurea composite system are used to introduce fluorine-containing monomers, so as to enhance water resistance and low-temperature stability; a three-dimensional network is constructed by free radical copolymerization, triethylamine is added to inhibit polymerization, and the feeding and post-ripening steps are optimized to balance the hardness, drying speed and surface state after cooking. The water-based single-component plastic paint of the present application is suitable for various plastic substrates such as automobile interior and exterior trim and 3C products, and has significant advantages in protection performance and construction adaptability.

According to the light superconductive carbon fiber composite cable and the preparation method thereof provided by the invention, the problem of resistance loss caused by grain boundary scattering in a graphene cable is solved by combining a graphene grain boundary repairing technology of a metal state on the surface of a topological insulator. The preparation method comprises the following steps: directionally depositing Bi2Se3 nanosheets on a graphene crystal boundary by using argon current carrying under the condition of 450-550 DEG C through a chemical vapor deposition process to form a continuous conductive channel. According to the method, complex lattice matching is not needed, the strict requirement of double-layer graphene on the magic angle precision is avoided, and the process error-tolerant rate is high. The surface metal state of the topological insulator improves the conductivity of the graphene by 20%-30%, and meanwhile, a dissipation-free topological edge state is reserved. The technology is combined with the light superconductive carbon fiber composite cable, so that the conductivity and mechanical stability of the cable are remarkably improved, and the light superconductive carbon fiber composite cable has a wide application prospect.

The invention provides a high-molecular conductive agent and a preparation method and application thereof, and belongs to the technical field of fine chemical assistants. Heptamethyltrisiloxane is firstly used for graft modification of oil-based dimethyl tertiary amine, and then the high-molecular conductive agent is synthesized with compounded monochloroalkane and maleic anhydride. The polymer conductive agent prepared by the invention has excellent storage stability, is not easy to freeze in winter and has strong conductivity, and the conductivity of the polymer conductive agent in a coating film can be kept for a long time. The polymer conductive agent has good compatibility with various resins, does not influence the transparency of a paint film, has small influence on the performance of the paint film, and does not rust the tank.

The invention discloses a preparation method and application of a Cu modified SAPO-34 composite material, relates to a preparation method of a catalyst for selective catalytic reduction of NO, and aims to solve the technical problems that active sites of an existing denitration molecular sieve catalyst Cu-SAPO-34 are easy to agglomerate, the low-temperature activity is poor, the hydrothermal stability is poor, and the water resistance and sulfur resistance are poor. The method comprises the following steps: weighing pseudo-boehmite, H3PO4, white carbon black, triethylamine, tetraethylenepentamine and a copper organic complex to prepare sol-gel; wherein the copper organic complex is copper acetylacetonate, copper glycinate or copper ethylenediamine dihydrate; and then the sol-gel is subjected to a hydrothermal reaction, an obtained precursor is calcined, and the Cu modified SAPO-34 composite material is obtained. The denitration conversion rate of the material at 150-430 DEG C can reach 90-100%, and the material has N2 selectivity, resists water vapor and sulfur dioxide, and can be used in the field of NH3-SCR denitration.

The application discloses a method for refining and removing impurities from Chinese torreya seed kernels by gradient pressing, and at least comprises the following steps: S3, segment refining: pumping the mixed Chinese torreya crude oil obtained in step S2 into a refining system, and sequentially performing low-temperature step-by-step treatment in the following five stages: S3.1, enzymatic ultrasonic low-temperature degumming: adding water and a composite enzyme preparation into the mixed Chinese torreya crude oil, stirring to form a mixed emulsion, controlling the reaction temperature of the mixed emulsion to be 40-45 DEG C, applying ultrasonic cavitation treatment for 30-40 minutes, then centrifugally separating and removing gum to obtain degummed oil. The application adopts low-temperature step-by-step segment refining, and through five-step low-temperature step-by-step synergistic refining of degumming, deacidification, decolorization, deodorization and dewaxing, an integrated synergistic impurity removal system is formed: enzymatic ultrasonic degumming completely removes gum, provides low-impurity and high-quality oil phase raw materials for the subsequent deacidification section, reduces the interference of impurities on the mass transfer efficiency of microbubble stripping, and lays the foundation for synergistic impurity removal.

The invention relates to an ethychlozate suspending agent as well as a preparation method and application thereof, and belongs to the technical field of plant growth regulators. The ethychlozate suspending agent mainly comprises water and the following components in percentage by mass: 5-20% of ethychlozate, 0.5-4% of a wetting agent, 0.3-3% of a dispersing agent, 1-2% of a thickening agent, 0.05-0.1% of a stabilizing agent and 4-10% of an anti-freezing agent, the wetting agent is selected from one of a sulfate anionic wetting agent, polyoxyethylene ether and isodecyl alcohol polyoxyethylene ether; the stabilizer is selected from one of formic acid, acetic acid, citric acid, sulfamic acid, sorbitol and sodium tripolyphosphate; the pH value of the ethychlozate suspending agent is 4 to 7. The ethychlozate suspending agent disclosed by the invention is high in suspension rate and good in low-temperature stability and heat storage stability in the storage and water-added use processes, can keep the drug effect stability of ethychlozate, and can adapt to reservoir conditions of various regions with relatively large temperature difference between south and north in China.

This invention relates to a hair-cleansing composition that uses a specific olefin sulfonic acid or its salt, which improves its performance when applied to hair and exhibits excellent low-temperature stability. Specifically, this invention relates to a hair-cleansing composition comprising the following components (A) to (C): (A) an olefin sulfonic acid or its salt having 16 carbon atoms, obtained by sulfonating a raw olefin having 16 carbon atoms with an average double bond position of 3.9 to 4.5; (B) an amphoteric surfactant; and (C) a nonionic surfactant, wherein the mass ratio of component (A) to component (B) is 1 to 50.

The utility model relates to the technical field of gradient films, and discloses a multifunctional color gradient film which comprises a gradient film body, a camera hole, a loudspeaker hole and a tightening frame. A gradual change film body is connected into the tightening frame in a hot melting mode and composed of an EVA color gradual change film, an elastic transition film A, an anti-crack reinforcing layer, a material base layer and an elastic transition film B. The anti-crack reinforcing layer is arranged on the surface layer of the top of the material base layer, and the elastic transition film A is arranged on the surface layer of the top of the anti-crack reinforcing layer. The top surface layer of the elastic transition film A is provided with an EVA color gradient film and a top protection layer, the bottom surface layer of the material base layer is provided with an elastic transition film B, and the bottom surface layer of the elastic transition film B is provided with a transparent heat insulation coating; the color gradient film has various functions, has the effects of heat insulation and crack resistance, and is high in elasticity, extrusion-resistant and durable.

The invention relates to Y-doped high-carbon-content austenitic low-density steel and a preparation method thereof, and belongs to the technical field of metal materials, and the Y-doped high-carbon-content austenitic low-density steel comprises the following chemical components in percentage by mass: 1.5-2.0 wt% of C, less than or equal to 0.2 wt% of Si, 25-30 wt% of Mn, 7-10 wt% of Al, 0.01-0.3 wt% of Y, less than or equal to 0.015 wt% of P, less than or equal to 0.008 wt% of S and the balance of Fe. According to the method, the Y-doped high-carbon-content austenitic low-density steel is subjected to homogenization treatment, primary hot rolling, secondary hot rolling and water cooling in sequence after being smelted, and the Y-doped high-carbon-content austenitic low-density steel has high strength synergistically contributed by grain boundary strengthening, solid solution strengthening and large-proportion shearable precipitation strengthening. And by adding Y, formation of harmful grain boundary precipitated phases and inclusions is inhibited, the plastic loss of the material is reduced, and the oxidation resistance of the material is enhanced.

The invention relates to the field of asphalt mixture preparation of road engineering, and discloses a high-performance asphalt mixture based on high and low temperature service environments and a preparation method thereof. According to the asphalt mixture disclosed by the invention, aggregate is used as a main material, a small amount of proper asphalt and fibers are added as auxiliary materials, and the aggregate structure of the asphalt mixture is properly selected, so that the grading structure of coarse and fine aggregate is more reasonable, and the coarse and fine aggregate of the asphalt mixture is embedded better, so that the volume index of the asphalt mixture can be better obtained; according to the preparation method, the proper porosity is particularly ensured, so that the high temperature, low temperature and water stability of the asphalt mixture can be optimized, the defects of the existing asphalt mixture preparation technology are overcome, and particularly the defects of the asphalt mixture mix proportion design based on a complex service temperature environment are overcome. The asphalt mixture can adapt to more complex road use environments, has good durability, and is suitable for asphalt mixture surface layers of highway road engineering, municipal road engineering and the like.

The invention relates to an elastomeric toothed belt comprising a fabric spanning the teeth of the toothed belt, wherein the elastomer mixture forming the teeth contains at least 70% by weight of crosslinked ethylene-propylene rubber (EPM) and / or crosslinked ethylene-propylene terpolymer rubber (EPDM) based on the proportion of polymers of the elastomer mixture, and wherein an intermediate layer is arranged between the fabric and the elastomer mixture forming the teeth, which intermediate layer contains at least 70% by weight of hydrogenated acrylonitrile-butadiene rubber (HNBR) based on the proportion of polymers of the intermediate layer. This elastomeric toothed belt is halogen-free and is characterized by improved durability and good low-temperature stabilization properties. The invention further relates to a method for producing these elastomeric toothed belts and the use of a hydrogenated acrylonitrile-butadiene rubber (HNBR) layer in these toothed belts to increase the service life, improve the low-temperature stabilization and improve the adhesion between the teeth and the fabric.

The application discloses a kind of quaternary ammonium salt cationic surfactants and its preparation method and application in defoaming glass water, it is related to surfactant technical field.The quaternary ammonium salt cationic surfactant is prepared by the following method: bis-trimethylsiloxy methyl silane is reacted with 4-vinyl phenyl glycidyl ether to generate intermediate 1;Heptaglycol monomethyl ether is reacted with intermediate 1 to generate intermediate 2;Dodecyl dimethyl tertiary amine is reacted with 3-bromo-2,2-bis(bromomethyl) propionic acid to generate quaternary ammonium salt compound;Intermediate 2 is reacted with quaternary ammonium salt compound to generate surfactant.The surfactant prepared in the application has lower surface tension and contact angle, and shows excellent low-temperature stability and detergency.