94 results about "Dimethylolpropionic acid" patented technology

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 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 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 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 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 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 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.

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 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 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.

The invention relates to the technical field of waterborne polyurethane, in particular to a low-viscosity waterborne polyurethane adhesive and application thereof. Comprising a component A and a component B. The component A comprises active molecules, an end-capping reagent and a chain extender, the active molecules comprise a first active molecule, a second active molecule, a third active molecule, a fourth active molecule and a fifth active molecule, the first active molecule is prepared from hydroxyl-terminated rubber, isocyanate and dimer acid polyester polyol, and the second active molecule is prepared from hydroxyl-terminated rubber, isocyanate and dimer acid polyester polyol. The second active molecule comprises a polyoxypropylene polyoxyethylene block copolymer, the third active molecule comprises modified polyether polyol, the fourth active molecule comprises polybutylene adipate, the fifth active molecule comprises dimethylolpropionic acid, and the weight ratio of the second active molecule to the fourth active molecule is 1: (2-5). And the component B comprises a curing agent. The curing agent has excellent thermal shock resistance and high-temperature aging resistance, and is suitable for various curing agents.

This invention belongs to the field of coating technology and discloses a high-penetration electrophoretic coating, its preparation method, and its application. The preparation method includes the following steps: mixing epoxy resin, dihydroxypolydimethylsiloxane, adamantane, a silane coupling agent, alcohol, and water; then adding modified pigments and additives and mixing to obtain the electrophoretic coating. The preparation of the modified pigment includes the following steps: mixing pigment, polyethylene glycol, a silane coupling agent, 2,2-dimethylolpropionic acid, sodium dodecyl sulfonate, and water to obtain the modified pigment. The electrophoretic coating of this invention has a penetration rate exceeding 66.0%, even reaching 71.1%, and the impact strength of the coating film formed by the electrophoretic coating can exceed 58 kg·cm.

This invention discloses a fluorine-free waterproofing agent and its preparation method, relating to the field of waterproofing agent technology. The preparation method involves mixing nano-silica with acrylate-terminated polydimethylsiloxane, octadecyl methacrylate, and methacryloxypropyltrimethoxysilane, followed by dropwise addition of azobisisobutyronitrile (AIBN) to obtain an organic-inorganic hybrid prepolymer acetone solution. Polycaprolactone diol, isophorone diisocyanate, and dibutyltin dilaurate react to prepare a polyurethane prepolymer. The mixture is then cooled and reacted with dimethylolpropionic acid and acetone, followed by further cooling, neutralization, and emulsification to obtain an aqueous polyurethane dispersion. This dispersion is then emulsified with the hybrid prepolymer, reacted with methyl methacrylate and hydroxyethyl acrylate, and finally reacted with glycerol polyglycidyl ether to obtain a composite emulsion. An antifoaming agent, leveling agent, and bactericide are added to the composite emulsion to obtain the fluorine-free waterproofing agent. The waterproofing agent of this invention provides durable waterproofing performance after being applied to fabrics.

The invention discloses ultraviolet-cured woodware anti-doodling matte finish paint and a preparation method thereof, and relates to the technical field of anti-fouling paint. The preparation method comprises the following steps: carrying out a reaction on a polyurethane prepolymer and hydroxyalkyl methacrylate to prepare hexafunctional-group anti-doodling polyurethane acrylate; the hyperbranched polyester acrylate is synthesized by taking pentaerythritol, 2, 2-dimethylolpropionic acid, succinic anhydride and hydroxyethyl methylacrylate as raw materials. The photo-initiation auxiliary agent is formed by combining a hydrogen abstracting type free radical initiator and hydroxyl-containing isocyanate modified amine according to a strict proportion, and the anti-doodling ultraviolet curing matte finish paint with excellent anti-doodling performance, high curing rate, good matte effect and high adhesive force and construction tolerance is formed; the anti-doodling matte paint has the advantages of being excellent in anti-doodling performance, matte effect and physical performance, high in construction efficiency and easy to operate.

The application relates to the technical field of rubber, and discloses a high-strength rubber transmission belt and a preparation method and application thereof. The high-strength rubber transmission belt comprises the following components by weight: 90-110 parts of ethylene-propylene-diene rubber, 6-10 parts of aramid fiber, 3-9 parts of nylon, 40-50 parts of filler, 4-6 parts of vulcanization activator, 5-9 parts of paraffin oil, 4-7 parts of adhesive, 3-4 parts of anti-aging agent, 11-15 parts of vulcanization aid, 2-4 parts of vulcanizing agent and 0.1-0.5 parts of anti-scorching agent. The filler comprises the following components by weight: 100 parts of carbon black, 5-7 parts of 4-maleimide benzoic acid and 5-7 parts of 2,2-dimethylol propionic acid. The technical scheme can solve the problem of insufficient strength of the rubber transmission belt in the related art.

The application discloses a polyurethane adhesive and a production method. The polyurethane adhesive is obtained by preparing an isocyanate end group prepolymer, then obtaining a water-based polyurethane molecular chain through small molecule chain extension, and finally introducing a copper ion crosslinked sodium alginate gel component to obtain a water-based polyurethane adhesive with interpenetrating polyurethane molecular chains and sodium alginate gel. The water-based polyurethane molecular chain is modified by dimethylol propionic acid, and Cu in CuO is released slowly in the subsequent preparation process 2+ , so that Cu 2+ is crosslinked with G units on the sodium alginate to obtain an ion crosslinked sodium alginate gel component. Since Cu 2+ forms a dynamic covalent bond with the G units, the bond can be reformed after being pulled apart by an external force, thus endowing the water-based polyurethane adhesive with self-repairing ability. The molar ratio of dimethylol propionic acid, CuO and triethylamine is required to be 2:1:1 to control the content of carboxyl groups in the polyurethane, so that the polyurethane adhesive obtained by self-emulsification has good hydrophilicity, and the system as a whole is neutral, thus expanding the application range of the water-based polyurethane adhesive.

This invention relates to the field of coating technology and discloses a weather-resistant luminescent coating and its preparation process. The invention involves reacting polyester polyol, isocyanate monomer, 2,2-dimethylolpropionic acid, and N-(acetoacetate-based)diethanolamine, followed by mixing with fillers, luminescent powder, emulsifying agents, and aminopropyl-terminated polydimethylsiloxane to obtain the weather-resistant luminescent coating. The aminopropyl-terminated polydimethylsiloxane and polyurethane undergo chemical cross-linking to form a tight three-dimensional chemical cross-linking network, which is not easily penetrated by corrosive media such as water. This significantly improves the water and weather resistance of the polyurethane coating film, preventing yellowing, chalking, and cracking even after long-term outdoor exposure. Furthermore, the high flexibility of the polysiloxane molecular chain achieves a dynamic balance between toughening and cross-linking rigidity of the polyurethane, improving the impact resistance and flexibility of the coating film, making it less prone to peeling and cracking.

The present invention relates to a wear-resistant and corrosion-resistant polyurethane material and a preparation method therefor, belonging to the technical field of polyurethane materials, and comprising the following raw materials in parts by weight: 100-150 parts of polyol, 50-65 parts of isophorone diisocyanate, 10-15 parts of dihydroxymethylpropionic acid, 1-2 parts of a catalyst, 8-12 parts of a chain extender, 4-8 parts of triethanolamine, 2-5 parts of carbon fiber, 5-10 parts of a modified filler, 2-5 parts of a corrosion inhibitor, 3-6 parts of a coupling agent, 1-3 parts of a foaming agent, and 1-3 parts of a foam stabilizer; the prepared polyurethane material has excellent wear resistance and corrosion resistance.

The invention relates to the field of fabrics, in particular to a wear-resistant easy-to-clean fabric, a preparation method thereof and a tool prepared from the fabric. A preparation method of the wear-resistant easy-to-clean fabric comprises the following steps: preparing modified nano aluminum oxide; preparing an outer-layer fabric; preparing a chitosan-based antibacterial agent; preparing an inner layer fabric; and preparing the wear-resistant easy-to-clean fabric. The preparation method comprises the following steps: reacting acryloyl chloride with 1, 4-butanediamine to generate a difunctional cross-linking agent with acrylamide double bonds at two ends, then preparing a prepolymer emulsion from the difunctional cross-linking agent, polytetrahydrofuran glycol, 2, 2-dimethylolpropionic acid and the like, and reacting with an organic silicon emulsion under the initiation of ammonium persulfate to prepare a modified waterborne polyurethane emulsion. The surface of the nylon fabric is coated with the coating to form the wear-resistant and easy-to-clean coating, so that the washing resistance of the coating can be remarkably improved, the long-term wear-resistant and easy-to-clean properties of the outer-layer fabric are maintained, the risk that the coating is stripped from the surface of the fabric during friction is reduced, and the wear resistance of the outer-layer fabric is improved.

The invention relates to the field of anticorrosive paint, in particular to hyperbranched epoxy resin anticorrosive paint and a preparation method thereof. The coating is a two-component system, wherein a component A comprises an epoxy resin main body, 5-20 parts of a hydroxyl-terminated hyperbranched polyester modifier, a flaky filler, an anti-rust pigment, a reactive diluent and an auxiliary agent; the algebra of the hyperbranched polyester is G2-G4, and the hyperbranched polyester is prepared by melt polycondensation of trimethylolpropane and 2, 2-dimethylolpropionic acid; and the component B is a polyamide curing agent. The preparation method comprises the following steps: synthesizing hyperbranched polyester; pre-mixing the component A with epoxy resin, grinding and dispersing with filler and auxiliaries, and mixing paint to obtain a component A; mixing a curing agent with a coupling agent to obtain a component B; by utilizing the unique structure of the hyperbranched polyester, the epoxy coating is obviously toughened on the premise of not losing the hardness, the viscosity of the system is reduced, the constructability and the filler dispersity are improved, and finally the high-performance coating with impact resistance, strong adhesion and long-acting corrosion resistance is obtained.

The invention provides an intrinsic uvioresistant fluorine-containing waterborne polyurethane acrylate coating and a preparation method thereof, and belongs to the technical field of waterborne polyurethane preparation. The method comprises the following steps: stirring isophorone diisocyanate, polytetrahydrofuran ether glycol and dimethylolpropionic acid, adding a catalyst, and stirring for reaction to obtain a polyurethane prepolymer; adding a chain extender into the polyurethane prepolymer, and stirring; cooling the reaction system after chain extension, adding an end-capping reagent for stirring reaction, continuously cooling the system, adding a neutralizer for stirring reaction; adding low-temperature deionized water into the reaction system, and stirring to disperse polyurethane to obtain a polyurethane emulsion; acrylate, fluorinated acrylate and an acrylate ultraviolet light absorber are added into the polyurethane emulsion, azobis (isobutylamidine hydrochloride) dissolved in water is slowly and dropwise added after stirring, a heat preservation reaction is conducted, and intrinsic anti-ultraviolet fluorinated waterborne polyurethane acrylate emulsion is obtained; and coating and drying the emulsion to obtain the intrinsic anti-ultraviolet fluorine-containing waterborne polyurethane acrylate film.

The invention relates to the technical field of conductive back adhesives, in particular to a low-temperature-resistant conductive back adhesive and a preparation process thereof.The low-temperature-resistant conductive back adhesive is prepared by constructing a flexible matrix based on dihydroxyl-terminated polydimethylsiloxane and a furan ring-containing isocyanate terminated prepolymer and introducing 2, 2-dimethylolpropionic acid for ionization modification. The material is endowed with low modulus and good dispersity; the surface-modified functionalized flake silver powder is used as a conductive filler, and a gradient distribution design is combined to form a stable conductive network; and the stress dissipation capability at low temperature is improved through a maleimide-furan reversible crosslinking system. According to the scheme, the problems that traditional conductive gum is prone to embrittlement and a conductive path is interrupted in a low-temperature environment are effectively solved, and the mechanical flexibility and the electrical connection reliability of the material at the low temperature are remarkably improved.

The invention discloses a polyurethane adhesive as well as a preparation method and application thereof. The polyurethane adhesive disclosed by the invention is prepared from a prepolymer, toluene triisocyanate TTI, a composite regulator and a carboxyl modifier, the preparation method of the prepolymer comprises the following steps: reacting dimethylolpropionic acid, isocyanate and polyol to prepare the prepolymer; the composite regulator comprises bismuth isooctoate and caprolactam; the carboxyl modifier is selected from one or a mixture of more than two of succinic acid, adipic acid and citric acid. The opening time of the polyurethane adhesive disclosed by the invention is obviously shortened to 10-25 minutes, so that the polyurethane adhesive is suitable for rapid construction requirements; the tensile shear strength of the polyurethane adhesive is 6-14 MPa and is improved by 15% or above compared with that of a traditional polyurethane adhesive, the interface peel strength is 15-22 N / mm and is improved by 20% or above when the polyurethane adhesive is used for bonding a metal base material, and the elongation at break is 450% or above.

The invention discloses a flame-retardant polyhydroxy melamine derivative and a preparation method thereof, and belongs to the field of high polymer material synthesis. According to the preparation method disclosed by the invention, 2, 2-dimethylolpropionic acid methyl ester and hexamethylol melamine are taken as raw materials, and melamine is modified through transesterification. Compared with the prior art, the product quality can be greatly improved, so that the product meets the production requirements of high-transparency epoxy resin and polyester resin, and the method has very good popularization and application values.

This invention relates to the field of new polyurethane materials, and more specifically to a high-strength carbon dioxide-based waterborne polyurethane, its preparation method, and its applications. The raw materials for preparing the carbon dioxide-based waterborne polyurethane, by mass parts, include: 100-130 parts of carbon dioxide-based polyol, 30-60 parts of diisocyanate, 5-10 parts of dimethylolpropionic acid, 3-8 parts of neutralizing agent, 0.05-0.1 parts of defoamer, 1-6 parts of chain extender, 0.05-0.2 parts of catalyst, and 250-400 parts of water. The product obtained by this invention is waterborne, environmentally friendly, and low in VOCs. It exhibits excellent emulsion stability, and the coating possesses high tensile strength, high Young's modulus, high hardness, and high elongation at break, with adhesion reaching grade 0. It overcomes the shortcomings of traditional carbon dioxide-based polyols, such as high cost, low reactivity, insufficient mechanical properties, and poor adhesion. It can be widely used in high-strength coatings for flooring, wooden furniture, and interior and exterior walls, possessing both low-carbon carbon sequestration and industrial application value.

This invention relates to the field of plastic coatings, aiming to solve the problem that existing coatings, after the appearance of microcracks, are difficult to repair and prone to further expansion of cracks. It provides a method for preparing a self-healing plastic coating, comprising the following steps: S100, mixing and reacting isophorone diisocyanate, polycarbonate diol, and bismuth neodecanoate to obtain a first prepolymer; S200, adding dimethylolpropionic acid and bis(2-hydroxyethyl) disulfide dissolved in a solvent to the first prepolymer, reacting to obtain a second prepolymer; S300, adding triethylamine to the second prepolymer, reacting, then adding deionized water, and finally adding an aqueous solution of ethylenediamine dropwise to obtain a self-healing plastic coating. This invention introduces dynamic disulfide bonds through bis(2-hydroxyethyl) disulfide and constructs a structure in which hard segment micro-regions with sufficient mechanical strength are dispersed in a freely moving soft segment matrix. This allows the disulfide bonds to contact and exchange after the material is damaged, achieving self-repair.

The invention discloses a preparation method and application of high-softness environment-friendly waterborne polyurethane foaming resin for clothing leather, and belongs to the technical field of foaming resin and textile artificial leather, the high-softness environment-friendly waterborne polyurethane foaming resin for clothing leather is prepared from the following components: polypropylene glycol (PPG-2000), polypropylene glycol (PPG-4000), polypropylene glycol (PPG-8000), diphenylmethane diisocyanate, 2, 2-dimethylolpropionic acid, trimethylolpropane, N, N-dimethylformamide, diphenylmethane diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, the high-softness environment-friendly waterborne polyurethane foaming resin for the clothing leather, which is prepared by the preparation method disclosed by the invention, has the characteristics of high foaming ratio, high foaming speed and environment friendliness; besides, the high-softness environment-friendly waterborne polyurethane foaming artificial leather for clothing leather prepared by the invention has extremely excellent softness and air permeability, can be widely applied to products such as clothing fabrics, furniture sofas, automobile seats and interiors, and has a wide market application prospect.

The invention relates to the technical field of TPU (Thermoplastic Polyurethane) adhesives, in particular to a self-repairing high-transparency TPU color-changing film for an automobile paint surface and a preparation method of the self-repairing high-transparency TPU color-changing film. The TPU color-changing film for the self-repairing high-transmittance automobile paint surface comprises a PET (Polyethylene Terephthalate) film and a TPU adhesive attached to one side of the PET film, the TPU adhesive is prepared from the following raw materials in parts by mass: 10 to 20 parts of polyether polyol, 5 to 10 parts of alicyclic diisocyanate, 1 to 5 parts of aromatic diisocyanate, 1 to 3 parts of 5-norbornene-2-carboxylic acid, 0.1 to 0.5 part of dibutyltin dilaurate, 5 to 10 parts of nano silicon dioxide, 0.5 to 1.5 parts of dimethylolpropionic acid, 0.1 to 1 part of aliphatic tertiary amine and 1 to 2 parts of pigment. The interface bonding strength, the self-repairing capability, the optical performance and the comprehensive durability of the TPU color-changing film are remarkably improved, and the problem that the optical performance is degraded after a traditional self-repairing material is repaired for multiple times is solved.