173 results about "Dimethylolpropionic acid" patented technology

The present invention relates to a preparation method of an intelligent self-repairing, flame-retardant and light-resistant water-based polyurethane coating. The method comprises the following steps: preparing a self-made hyperbranched flame retardant and using it in the synthesis of a polyurethane prepolymer; cooling the mixture to 58° C., adding 2,2-dimethylolpropionic acid, reacting the mixture for 1 to 2 hours, adding 1 to 2 parts of a disulfide compound, reacting the mixture for 1 to 2 hours at 60 to 80° C., adding 1 to 2 parts of a hydrogen bonding agent, reacting the mixture for 1 hour at 60 to 80° C., adding 0.5 to 1.5 parts of a coumarin derivative, and reacting the mixture for 60 to 90° C. The mixture was stirred for 1-2 hours, and then spiropyran, diethanol monoisopropanolamine, and 0.01 parts of p-toluenesulfonamide were added, and the mixture was reacted at 50°C for 30 minutes. The temperature was lowered to 40-45°C, and 1-2 parts of triethylamine were added, and the mixture was reacted for 1-2 hours. The mixture was cooled to room temperature, and 60-65 parts of water were added. The mixture was stirred at a speed of 1800-2000 r / min for 0.5-1 hour to obtain an intelligent self-healing, flame-retardant, and light-resistant water-based polyurethane coating. The flame retardancy and self-healing properties of the obtained water-based polyurethane were significantly improved.

The invention relates to the technical field of preparation of water-based functional polymer materials, in particular to a preparation method of water-based polyurethane slurry for sports shoe leather, which comprises the following steps: mixing polycarbonate diol, core-shell structure graphene oxide-polycaprolactone hybrid nanoparticles and dimethylolpropionic acid, and carrying out vacuum dehydration treatment, isophorone diisocyanate is added for a reaction, and a polyurethane prepolymer is obtained; after the polyurethane prepolymer is cooled, triethylamine is added for a neutralization reaction; under violent stirring, adding a mixture composed of 1, 4-butanediol and a hyperbranched organosilicon amino chain extender serving as a flexible functional core into the neutralized prepolymer to carry out chain extension reaction, and adding deionized water to carry out reversed-phase emulsification, so as to obtain a waterborne polyurethane emulsion; standing and curing the waterborne polyurethane emulsion at a preset temperature to obtain waterborne polyurethane slurry; the finally prepared shoe leather material has excellent wear resistance and excellent low-temperature bending durability.

The invention relates to the technical field of anti-yellowing, in particular to anti-yellowing lining cloth with a hot melt coating and a preparation method of the anti-yellowing lining cloth. Composite carbon dots, an anti-yellowing agent and a composite chitosan solution are adopted to prepare finishing liquid for finishing the lining cloth; the preparation method comprises the following steps: selecting furfural and urea as a carbon source and a nitrogen source, performing one-step hydrothermal synthesis to obtain a nitrogen-doped furfural-based carbon dot, and grafting an amino-terminated polyimidazolium salt antibacterial compound to obtain a composite carbon dot; wherein the amino-terminated polyimidazolium salt antibacterial compound is an amino-terminated halogen-free polyimidazolium salt antibacterial compound which is prepared by taking ethylenediamine, butyric acid, glyoxal and formaldehyde as raw materials based on amine-aldehyde polycondensation and has good biocompatibility; the preparation method comprises the following steps: by taking polybutylene adipate, toluene diisocynate and isophorone diisocyanate as main monomers, polypropylene oxide triol as a crosslinking monomer, 2, 2-dimethylolpropionic acid and 4, 4 '-diaminodiphenyl disulfide as chain extenders and composite carbon dots as an end-capping reagent, adding water and emulsifying to obtain the waterborne polyurethane hot melt adhesive.

The invention belongs to the technical field of high polymer materials, and particularly relates to a PET decorative film and a preparation method thereof. The preparation method comprises the following steps: synthesizing hydroxyl-terminated hyperbranched polyester by taking pentaerythritol and 2, 2-dimethylolpropionic acid as raw materials, and reacting with polyol glycidyl ether to prepare an epoxy-terminated organic modifier; silver-loaded nano silicon dioxide subjected to surface treatment by an amino silane coupling agent is used as inorganic functional particles; pET resin, an organic modifier and inorganic functional particles are subjected to melt blending and extrusion granulation, and modified PET is prepared; the modified PET is prepared into the film through a two-way stretching process. Epoxy groups of the organic modifier chemically react with amino groups at the tail end of a PET molecular chain and on the surfaces of inorganic particles respectively, a stable organic-inorganic hybrid network is constructed, synergistic improvement of reinforcement, toughening and long-acting antibiosis is achieved, and the technical problems that functional particles are not uniform in dispersion, interface bonding is weak, and antibacterial components are prone to migration are effectively solved.

The invention discloses self-repairing waterborne polyurethane based on double dynamic bond synergy and a preparation method thereof.The method comprises the following steps that 1, in the nitrogen atmosphere, after isophorone diisocyanate, polytetrahydrofuran diol and dimethylolpropionic acid react for a period of time, a catalyst is added for continuous reaction, and a prepolymer is synthesized; (2) adding N, N-di-tert-butyl ethylenediamine into the prepolymer, and carrying out chain extension reaction; (3) adding dithiothreitol into the solution after the reaction in the step (2) to carry out cross-linking reaction; and (4) adding triethylamine into the solution obtained after the reaction in the step (3), and carrying out a salt forming reaction to obtain the self-repairing waterborne polyurethane emulsion based on double dynamic bond synergy. High self-healing efficiency and mechanical performance are achieved by introducing dynamic covalent bonds with double thermal responses, and reprocessing and recycling are achieved at the same time.

The invention relates to the technical field of chemical fiber manufacturing, in particular to a preparation process of graphene reinforced porous hollow polyester fibers. The problems that existing polyester fibers are insufficient in mechanical property and poor in moisture absorption and air permeability are solved. The preparation method comprises the following steps: modifying a PET sheet by using 2, 2-dimethylolpropionic acid and hydroxyl-terminated polydimethylsiloxane to obtain modified PET; the preparation method comprises the following steps: taking chitosan modified graphene as a carrier, and loading metal ions to obtain loaded graphene; polyethylene glycol and sodium bicarbonate are used as pore-foaming agents; modifying octadecyl dimethyl allyl ammonium chloride to obtain an antibacterial toughening agent; all the components are mixed, and the polyester fiber is prepared through melt spinning, stretching, heat treatment and alkali treatment. The mechanical property of the fiber is improved through the introduction of graphene and the modification treatment of the PET sheet; by utilizing the composite pore-foaming agent and adjusting the process, the moisture absorption and air permeability of the fiber are improved, and the service life of the fiber is prolonged.

The invention relates to the technical field of polyurethane materials, in particular to a non-MOCA type fitness equipment rubber coating material and a preparation method thereof. The preparation method comprises the following steps: adding polytetrahydrofuran, isophorone diisocyanate, 1, 4-butanediol, a 2, 2-dimethylolpropionic acid solution, a hydroxyl chain extender, triethylamine, deionized water and a flame-retardant filler to obtain a polyurethane emulsion; and coating the polyurethane emulsion to form a film, and drying to obtain the polyurethane adhesive film. Adding the flame-retardant filler into ethanol, and ultrasonically dispersing uniformly to obtain dispersion liquid; spraying the dispersion liquid onto the surface of a polyurethane adhesive film to obtain a pretreated polyurethane adhesive film; and carrying out layer-by-layer self-assembly on the surface of the pretreated polyurethane adhesive film for 5-6 times to obtain a finished product. The finished product prepared by the invention has excellent flame retardant property, antibacterial property and mechanical property, thereby having wide application prospect in the technical field of polyurethane materials.

The invention discloses a high-elastic material for an anti-slip sole and a preparation method of the high-elastic material in the field of high polymer materials. The high-elastic material is prepared from the following raw materials: modified polyurethane, modified silicone rubber, calcium carbonate, dicumyl peroxide, 2-mercaptobenzothiazole, N-isopropyl-N '-phenyl p-phenylenediamine and naphthenic oil. Wherein the modified polyurethane is prepared by the following steps: carrying out vacuum dehydration on polybutylene adipate, reacting with toluene diisocynate to prepare an isocyanate-terminated prepolymer, adding dimethylolpropionic acid, triethylamine and deionized water to obtain a water-based dispersion, and carrying out graft copolymerization on the water-based dispersion, methyl methacrylate and the like; the preparation method comprises the following steps: preheating modified polyurethane, mixing with modified silicone rubber at a high speed, adding calcium carbonate and naphthenic oil, carrying out double-roller open milling and thin-passing, adding a vulcanizing agent and the like, carrying out overturning milling, and carrying out flat plate vulcanization molding. The material is used for anti-skid soles, and has the advantages of high elasticity, lasting skid resistance and excellent weather resistance.

The invention relates to a formaldehyde-free environment-friendly polyurethane adhesive and a preparation method thereof, relates to the technical field of high polymer materials, and aims to solve the problems of formaldehyde residue, poor water resistance, high process energy consumption, high cost and the like of the existing formaldehyde-free adhesive. According to the invention, dimethylolpropionic acid and wood metal ions form coordinate bonds to strengthen interface bonding, trimethylolpropane constructs a three-dimensional hydrophobic network, and toluene diisocynate isomers are subjected to fractional reaction to optimize crosslinking uniformity. The content of free formaldehyde in the adhesive is not detected, the adhesive strength retention rate is greatly improved after the adhesive is boiled in boiling water for 72 hours, the hot pressing time is shortened to 8 minutes, and the raw material cost is reduced by 40% or above compared with similar products.

The invention relates to a built-in foam material for noise reduction of a new energy automobile tire as well as a preparation method and application of the built-in foam material, and belongs to the technical field of polyurethane foam materials. The foam material is composed of a component A and a component B, wherein the weight percentage ratio of the component A to the component B is 100: (30-70); the component A is prepared from the following components in parts by weight: 100 to 120 parts of polyhydric alcohol I, 50 to 70 parts of polyhydric alcohol II, 20 to 30 parts of polyhydric alcohol III, 0.01 to 0.1 part of catalyst, 15 to 25 parts of chain extender, 20 to 40 parts of foam stabilizer, 5 to 10 parts of liquid nitrile rubber, 1 to 5 parts of high-temperature-resistant epoxy adhesive and 4 to 8 parts of foaming agent; the component B comprises isocyanate; the polyol I comprises polytetramethylene ether glycol, the polyol II comprises polycaprolactone diol, and the polyol III comprises one or more of 2, 2-dimethylolpropionic acid and 2, 2-dimethylolbutyric acid. The foam material has better high temperature resistance, rigidity and toughness, foam cavities are uniform, the overall material density is small, and the mute effect is good.

The invention discloses a modified waterborne polyurethane adhesive and a preparation method thereof, and relates to the technical field of adhesives. The carbon dioxide-based polycarbonate polyol is prepared from the following raw materials in parts by mass: 70 to 84 parts of carbon dioxide-based polycarbonate polyol, 8 to 9.6 parts of hexamethylene diisocyanate, 3 to 3.6 parts of isophorone diisocyanate, 0.01 to 0.012 part of dibutyltin dilaurate, 10 to 12 parts of N-methyl pyrrolidone, 3.5 to 4.2 parts of dimethylolpropionic acid, 0.1 to 0.5 part of 1, 3-butanediol, 0.1 to 0.5 part of a catalyst and 0.1 to 0.5 part of a catalyst. The adhesive is prepared from the following components in parts by weight: 1 to 1.2 parts of 1, 4-butanediol, 21 to 25.2 parts of modified polyurethane dispersion, 2 to 2.5 parts of silane-terminated dynamic cross-linking agent, 2.8 to 3.4 parts of triethylamine, 40 to 60 parts of acetone, 200 to 220 parts of deionized water and 10 to 12 parts of ethylenediamine aqueous solution. By introducing the modified polyurethane dispersion and the silane-terminated dynamic cross-linking agent, the base material universality, water resistance and temperature resistance of the adhesive are effectively improved.

The invention relates to the technical field of composite resin coatings, in particular to a water-based composite resin coating and a preparation method thereof. According to the technical scheme, the waterborne polyurethane adhesive comprises the following components in parts by weight: 25-40 parts of waterborne polyurethane dispersion, wherein the waterborne polyurethane dispersion is prepared by reacting isophorone diisocyanate, poly (butylene adipate) glycol, dimethylolpropionic acid, ethylenediamine, polyethylene glycol monomethyl ether, triethylamine and nano cellulose. Through the triple synergistic effect of the nano-cellulose reinforced polyurethane phase, the montmorillonite crosslinked acrylic acid phase, the titanium dioxide and the graphene composite material, the balance of high hardness and high flexibility of the water-based paint is realized, the self-cleaning, antibacterial and corrosion-resistant functions are synchronously achieved, the water-based paint is long-acting and stable, the weather resistance is also remarkably improved to prolong the life cycle of the coating, and the water-based paint has a good application prospect. Excellent performance and environment-friendly value are realized.

The invention provides solvent-resistant polyurethane resin, which is prepared from the following substances in parts by mass: 60 to 90 parts of diol, 15 to 25 parts of diisocyanate, 3 to 8 parts of auxiliaries, 1.5 to 3 parts of 1, 4-bis (2-hydroxyethyl) piperazine, 2 to 4 parts of 2, 2-dimethylolpropionic acid, 0.5 to 2 parts of catalysts, 0 to 3 parts of 4, 4 '-dithiodibenzoic acid diglycidyl ester and 0 to 2 parts of sodium alginate. Meanwhile, the invention further provides a simple preparation method, and the prepared solvent-resistant polyurethane resin is low in soaking swelling rate, good in solvent resistance, high in tensile strength and simple in preparation process and can be applied to the industries such as chemical anticorrosive paint, printing ink and electronic packaging.

The invention relates to the technical field of manufacturing of coated paperboards, in particular to frame paper for cigarettes and a preparation process of the frame paper. The problem that the mechanical property and the barrier property cannot be considered at the same time in the prior art is solved. According to the frame paper for the cigarettes, the bleached hardwood pulp and the softwood pulp are compounded, and the calcium carbonate and the nanocellulose crystals are added to prepare the high-uniformity modified paper base; then, polycaprolactone diol, isophorone diisocyanate, dimethylolpropionic acid and 1, 4-butanediol are subjected to a reaction, aminopropyltriethoxysilane is used for blocking, obtained polyurethane emulsion is mixed with gelatinized starch and flaky kaolin step by step, and the composite coating is prepared; coating double surfaces of the modified paper base with the composite coating, and performing step-by-step drying, hot-pressing shaping and curing to obtain the paper. Through multi-stage cooperation of paper base-coating-process, the frame paper has excellent mechanical properties, high printing stability and high barrier property, and is suitable for the field of high-grade cigarette packaging with strict performance requirements.

The application relates to the technical field of finishing agents, and discloses a water-based fluorine-free low-temperature water-repellent finishing agent and a preparation method and application thereof. 2,2-dimethylol propionic acid alkyl ester and methyl phenyl dichlorosilane are reacted to obtain an alkyl ester siloxane copolymer, which is then stirred and dispersed with water and an emulsifier to obtain the water-based fluorine-free low-temperature water-repellent finishing agent. The main chain of the water-based fluorine-free low-temperature water-repellent finishing agent is a hydrophobic phenyl polysiloxane molecular chain, and the side chain contains hydrophobic ester groups and long carbon chains. After finishing of terylene fabric, water molecules can be prevented from contacting the terylene surface, and the hydrophobic and water-repellent performance of the terylene fabric is significantly improved. Moreover, a high water contact angle can be maintained after multiple washes.

The invention discloses hyperbranched polyurethane acrylate UV light-cured resin and a preparation process thereof, and belongs to the technical field of hyperbranched UV light-cured resin. The preparation process disclosed by the invention adopts step-by-step prepolymerization and comprises the following steps: firstly, constructing a linear polymer main chain skeleton by using low-polarity dihydric alcohol, and continuously reacting an obtained primary polyurethane prepolymer with a polyol monomer consisting of trimethylolpropane, trimethylolpropane monoallyl ether, dimethylolpropionic acid and pentaerythritol to obtain a secondary polyurethane prepolymer; and finally, carrying out end capping by adopting pentaerythritol triacrylate. The prepared hyperbranched polyurethane acrylate UV light-cured resin is high in curing speed, low in viscosity, high in hardness and good in flexibility, and can be applied to various fields such as UV plastic coatings, precise ink-jet printing and wood coatings.

The application discloses a preparation method and application of modified hyperbranched polyurethane for track traffic field finish paint, and comprises the following raw materials: 2,2-dimethylol propionic acid, dicyclohexyl methane-4,4'-diisocyanate, modified chain extender and catalyst. The modified hyperbranched polyurethane containing double benzimidazole structures and curcumin and the phosphorus-nitrogen six-membered ring functional agent A containing a large number of hindered phenol structures are used in the preparation of the track traffic finish paint, so that the finish paint has excellent ultraviolet aging resistance, heat aging resistance and mechanical properties, and also has the effect of flame retardation.

The invention discloses a sheet molding compound for a torrent swimming pool wall. The sheet molding compound is prepared from the following raw materials: isophthalic resin, hyperbranched unsaturated polyester, a low-shrinkage additive, a curing agent, a release agent, a polymerization inhibitor, a thickening agent, a diluent, fibers and filler, the isophthalic resin is prepared from isophthalic acid, fumaric acid, neopentyl glycol and 1, 2-propylene glycol through a two-step process under the action of a catalyst and an initiator; the hyperbranched unsaturated polyester is obtained by sequentially grafting pentaerythritol serving as a central monomer with bis (hydroxymethyl) propionic acid serving as a branched monomer and lauric acid for low viscosity and carrying out end-capping modification with acrylic acid. The mechanical property and the water resistance of the isophthalic resin are optimized through the compounding and preparation steps of the isophthalic resin raw materials; the hyperbranched unsaturated polyester and the isophthalic resin have good compatibility in compounding, the viscosity of the raw materials is adjusted, and the mechanical property and the heat resistance of the product are further optimized after crosslinking.

The invention relates to the technical field of rubber, and provides a high-strength rubber transmission belt as well as a preparation method and application thereof. The high-strength rubber transmission belt is prepared from the following raw materials in parts by weight: 90 to 110 parts of ethylene propylene diene monomer, 6 to 10 parts of aramid fiber, 3 to 9 parts of nylon, 40 to 50 parts of filler, 4 to 6 parts of vulcanizing activator, 5 to 9 parts of paraffin oil, 4 to 7 parts of adhesive, 3 to 4 parts of anti-aging agent, 11 to 15 parts of auxiliary vulcanizing agent, 2 to 4 parts of vulcanizing agent and 0.1 to 0.5 part of scorch retarder. The filler is prepared from the following raw materials in parts by weight: 100 parts of carbon black, 5 to 7 parts of 4-maleimidobenzoic acid and 5 to 7 parts of 2, 2-dimethylolpropionic acid. Through the technical scheme, the problem of insufficient strength of the rubber transmission belt in the related technology is solved.

The invention discloses a polyurethane adhesive for flexible packaging of a new energy battery and a preparation method of the polyurethane adhesive, and belongs to the technical field of adhesives. The adhesive is prepared by adopting hydrogenated bisphenol A as a polyol raw material and dicyclohexylmethane diisocyanate (HMDI) as isocyanate and cooperating with dimethylolpropionic acid, triethylamine, 1, 4-butanediol and other raw materials through the steps of prepolymer synthesis, chain extension reaction, neutralization reaction, addition of auxiliaries, emulsion preparation and the like. The core innovation lies in that the electrolyte erosion resistance is improved through an ether bond structure of hydrogenated bisphenol A, the weather resistance and rigidity are enhanced by using a hydrogenated alicyclic structure of hydrogenated bisphenol A, and meanwhile, the crosslinking density and the interface bonding force are balanced by optimizing the use amount of 1, 4-butanediol and adding a silane coupling agent KH-550. The adhesive has excellent electrolyte resistance (the adhesive strength retention rate after soaking is greater than or equal to 90%), good low-temperature resistance flexibility (no crack when bent at-40 DEG C) and prominent weather resistance (the performance retention rate after xenon lamp aging for 1000h is greater than 90%).

The application relates to the technical field of filter materials, in particular to a high-precision wear-resistant filter material coated with a nano coating and a preparation method thereof. A non-woven fabric is used as a filter support layer, a nano silicon sol dispersion solution is coated on the surface of the filter support layer, heat setting is carried out, an upper filter surface layer is formed, the filter material is obtained, the prepared upper filter surface layer has a three-dimensional structure, the average pore diameter of the upper filter surface layer is controlled to be 5-10 mu m, the nano silicon sol dispersion solution is obtained by mixing nano silicon sol, PTFE emulsion, acrylic emulsion, fluorocarbon surfactant, silane coupling agent, film forming agent and deionized water, the self-repairing polyurethane emulsion is used as the film forming agent, the polytetrahydrofuran and isophorone diisocyanate are used as raw materials to synthesize a prepolymer, the 2,2-dimethylol propionic acid is used as a hydrophilic chain extender, and the modified nano zinc oxide and glycyl glycine methyl ester are used as end-capping agents.

The invention relates to the technical field of leather finishing agents, and discloses environment-friendly weather-resistant waterborne polyurethane for leather finishing and a preparation method of the environment-friendly weather-resistant waterborne polyurethane. The preparation method comprises the following steps: adding thiolated modified titanium dioxide into ethyl acetate, adding 4-allyl catechol, 2-methyl-2-acrylic acid-2, 2, 6, 6-tetramethyl-4-piperidyl ester and a photoinitiator, uniformly stirring, irradiating with ultraviolet light, filtering, washing, and drying to obtain a titanium dioxide weather-resistant agent; under the protection of nitrogen, heating polytetrahydrofuran glycol, composite modified montmorillonite and isophorone diisocyanate, adding a catalyst for reaction, adding dimethylolpropionic acid, stirring while keeping the temperature, adding ethylene glycol, and stirring while keeping the temperature to obtain a polyurethane prepolymer; and adding triethylamine, stirring, adding water and a titanium dioxide weather-resistant agent, uniformly dispersing, adding ethidene diamine, and uniformly stirring to obtain the waterborne polyurethane. The prepared waterborne polyurethane has good weather resistance and wear resistance.

The invention discloses a water-based carbon aluminum foil coating and a preparation method thereof, and relates to the technical field of carbon aluminum foil coatings. The preparation method comprises the following steps: reacting poly (1, 4-butanediol adipate), isophorone diisocyanate and dimethylolpropionic acid to obtain a polyurethane prepolymer, neutralizing with triethylamine, and emulsifying to prepare a polyurethane pre-emulsion; aniline, pyrrole, p-benzene disulfonic acid and ammonium persulfate are added into the polyurethane emulsion for polymerization, and an aniline-pyrrole copolymer / polyurethane composite emulsion is obtained; performing mixed acid treatment on the superconductive carbon black to obtain oxidized superconductive carbon black; the preparation method comprises the following steps: mixing graphene oxide, oxidized superconductive carbon black and aniline, adding ammonium persulfate for polymerization, and performing hydrazine hydrate hydrothermal reduction to obtain polyaniline grafted reduced graphene oxide / superconductive carbon black composite conductive slurry; and mixing the composite emulsion and the composite conductive slurry with a defoaming agent and a flatting agent, stirring, standing and curing to obtain the coating. The water-based carbon-coated aluminum foil coating prepared by the invention has excellent conductivity.

This invention discloses a method for preparing a side-chain liquid crystal photosensitive resin monomer with photo-oriented and thermally anisotropic properties and its application in 3D printing. Using 2,2-di(hydroxymethyl)propionic acid, isophorone diisocyanate, and hydroxyethyl methacrylate as raw materials, a side-chain liquid crystal photosensitive resin monomer is prepared and applied to 3D printing resin. Under the action of a 3D printing laser, the liquid crystal units in the side-chain liquid crystal photosensitive resin monomer of this invention form an oriented structure in the laser direction, allowing heat flow to be conducted along the oriented structure and effectively suppressing phonon scattering, thus exhibiting thermal anisotropy. Simultaneously, the side-chain liquid crystal photosensitive resin monomer with photo-oriented and thermally anisotropic properties of this invention exhibits good mechanical properties after 3D printing.

The present application relates to filter cotton technical field, specifically, it is a kind of high-temperature oven special heat-resistant filter cotton and its preparation process.It includes the following raw materials: polytetrafluoroethylene fiber, fluoroethylene carbonate, silicone resin, 2,2-dimethylol propionic acid, oil agent, pore-forming agent, adhesive and silicon carbide fiber.In the present application, under high-temperature oven working condition, polytetrafluoroethylene fiber melts and flows to wrap silicon carbide fiber to form "sheath-core" sealing structure, which can block the penetration of corrosive medium;fluoroethylene carbonate decomposition product reacts with the surface of silicon carbide fiber to form nanocomposite layer, its micro-nano level rough interface can induce airflow turbulence, and micropore can prolong airflow path, further improve the diffusion capture efficiency of submicron particles, so that filter cotton can still maintain high interlaminar peeling strength after thermal cycling under high-temperature oven working condition, thereby ensuring the premise of filtration performance to improve the high-temperature resistance of filter cotton.

The invention discloses a waterborne polyurethane curing agent as well as a preparation method and application thereof. The waterborne polyurethane curing agent is prepared from the following raw materials in parts by mass; based on the total amount of the raw materials being 100 parts, the raw materials comprise 30-32.5 parts of aromatic isocyanate; 2 to 2.3 parts of 2, 2-dimethylolpropionic acid; 25 to 27.5 parts of a nonionic hydrophilic monomer; 3 to 4.5 parts of trimethylolpropane; 23 parts to 25.5 parts of a solvent; 8 to 16.5 parts of an end-capping reagent; and 0.07 to 0.1 part of an organic tin catalyst. According to the invention, aromatic isocyanate, 2, 2-dimethylolpropionic acid, a nonionic hydrophilic monomer, trimethylolpropane, an end-capping reagent and an organic tin catalyst are selected as raw materials to prepare the curing agent, and through the synergistic effect of the raw materials, the performance balance of rapid curing, water dispersibility, stability and high mechanical strength is realized.

The application relates to a preparation method of a flame-retardant modified polyisocyanate, and belongs to the technical field of polyurethane elastomers. Nano-composite flame retardants are chemically grafted through the reaction of hydroxyl groups and isocyanate groups in polyisocyanate segments, can be uniformly dispersed in a hydrophilic system, and avoid agglomeration and sedimentation caused by physical mixing. Not only is the dispersibility of the nano-composite flame retardants in polymers improved, but also the interfacial bonding force between the two is improved. 2,2-dimethylol propionic acid is covalently grafted to the polyester side chain of the polyisocyanate through the esterification reaction of hydroxyl groups, pyromellitic anhydride and trimethylolpropane, is converted into a carboxylate after neutralization, and the dispersibility in water is improved. The branched main chain of the comb-shaped polyisocyanate and the side chain polyester unit form a large steric hindrance, further weaken the van der Waals force between molecules, enhance the repulsion between particles, avoid molecular aggregation, and make the flame-retardant modified polyisocyanate form a stable and uniform dispersion liquid in deionized water.

The invention belongs to the technical field of high polymer materials, and particularly relates to a waterborne polyurethane emulsion, a biodegradable polyurethane sterilization surgical glove and a preparation method and application of the biodegradable polyurethane sterilization surgical glove. The waterborne polyurethane emulsion is prepared from the following components in parts by weight: 70 to 95 parts of degradable soft segments, 30 to 50 parts of hard segments, 5 to 9 parts of 2, 2-dimethylolpropionic acid, 1.5 to 3.2 parts of a neutralizing alkali agent, 2 to 6 parts of a chain extender, 0.02 to 0.08 part of a catalyst and 1 to 3 parts of lignin nanoparticles. The skin-friendly inner layer / hydrophobic outer layer functionally gradient glove is spontaneously formed through one-time impregnation by adopting the semi-neutralized emulsion and the lignin filler; irradiation sterilization synchronously enhances the mechanical property; the abandoned industrial compost is rapidly degraded, the core function is triggered by using the existing process in the whole process, additional steps or expensive additives are not needed, and the raw materials are easy to obtain, low in cost and environmentally friendly.

The invention relates to the field of new textile materials, and discloses a high-breathability waterproof fabric and a preparation method thereof.The fabric comprises a surface layer fabric, a functional middle layer and an inner layer fabric which are sequentially laminated and compounded; the surface layer fabric is a polyester filament yarn fabric finished by a self-crosslinking type fluoride-free water-repellent emulsion consisting of octadecyl acrylate, dodecyl methacrylate and N-hydroxymethyl acrylamide; the functional middle layer is a polytetrafluoroethylene microporous membrane coated with a moisture curing type hydrophilic polyurethane adhesive, and the raw materials of the adhesive comprise polyethylene glycol 2000, 2, 2-dimethylolpropionic acid and isophorone diisocyanate; and the inner-layer fabric is a superfine denier polyester fiber and bamboo charcoal fiber blended knitted fabric. The contradiction that the air permeability and the bonding fastness of the PTFE microporous membrane are difficult to consider at the same time is effectively solved through a gradient pressurization process, meanwhile, one-way moisture conduction is achieved through the inner-layer superfine fibers and the middle-layer hydrophilic component, and the PTFE microporous membrane has high hydrostatic pressure resistance, high moisture permeability and excellent washing fastness.

The invention relates to the technical field of automobile coating rubber, in particular to high-viscosity anti-aging coating rubber and a preparation method thereof.The high-viscosity anti-aging coating rubber comprises a main agent and a curing agent, preparation raw materials of the main agent at least comprise an HDI end-capped modified hydroxyl mixture and modified amine, and the curing agent is a combination of an HDI tripolymer and an isophorone diisocyanate end-capped hydroxyl compound; the HDI-terminated modified hydroxyl mixture is prepared by terminating a modified hydroxyl mixture with HDI, and the modified hydroxyl mixture at least comprises the following preparation raw materials in parts by weight: 45-70 parts of an alcohol-terminated prepolymer, 30-50 parts of poly (1, 4-butylene adipate) glycol and 2-5 parts of 2, 2-dimethylolpropionic acid. By adopting the specific modified hydroxyl mixture, the modified amine and the curing agent, the main agent and the curing agent have longer service time after being mixed, meanwhile, the excellent initial bonding strength and low-temperature resistance of the product are ensured, and the actual application requirements are better met.