1932 results about "Di-isocyanate" patented technology

This invention discloses a visible-light-responsive dynamically covalently cross-linked self-healing polyurethane and its preparation method, belonging to the field of self-healing materials technology. The material is prepared by reacting diisocyanate, long-chain diol, butanediol, trimethylolpropane, and a monool containing an azophenylboronic acid structure in a certain proportion at 60°C. This invention achieves visible-light-responsive self-healing of the polyurethane material by introducing a visible-light-responsive azophenylboronic acid structure into the polyurethane and utilizing the photoresponsive cis-trans isomerization of the azo structure to regulate the reversible breakage and recombination of the boron-oxygen hexacyclic ring. The visible-light-responsive dynamically covalently cross-linked self-healing polyurethane material prepared by this invention maintains high mechanical strength (16.47 MPa) while exhibiting a strength self-healing efficiency of 95.8% after 8 hours of visible light irradiation, showing broad application prospects in smart materials, anti-corrosion coatings, and other fields.

The invention discloses a large-current-carrying-capacity flexible power cable, which belongs to the technical field of cable preparation, is used for solving the technical problem that the flame retardant property and the mechanical property of the power cable need to be further improved in the prior art, and specifically comprises a cable core, a wrapping layer, an insulating layer and a sheath layer which are sequentially arranged from inside to outside. The preparation method comprises the following steps: preparing alkoxy silane containing a benzocyclobutene group, preparing flame-retardant particles by using a sol-gel method, preparing modified polyurethane by using modified polysiloxane and 2, 5-furandimethanol as soft segments, naphthalene diisocyanate as a hard segment and trimethylolpropane as a chain extender, and preparing the flame-retardant flame-retardant polyurethane. The linear low-density polyethylene, the MAH-g-PE, the modified polyurethane, the flame-retardant particles and the auxiliary additive are melted and extruded outside the wire core to form the insulating layer, so that the power cable is obtained, the flame-retardant property of the power cable is effectively improved, and the mechanical property and the current-carrying stability of the power cable are also improved.

The invention discloses an insulated wire, a coil and electronic / electrical equipment, and relates to the technical field of insulated wires. The modified polyamide-imide insulating layer is composed of an insulating material obtained by reacting diisocyanate with mixed anhydride, wherein the mixed anhydride comprises short-chain anhydride and long-chain anhydride. According to the insulated wire coated with the polyamide-imide insulating layer, the wire flexibility is improved, the insulated wire is suitable for closer arrangement of complex groove types, and then the motor groove fullness rate is improved, so that the size of a stator iron core is reduced under the same power, the motor weight is indirectly reduced, and the requirement for light weight is met.

The invention discloses a polyurethane modified epoxy resin adhesive as well as a preparation method and application thereof, and the polyurethane modified epoxy resin adhesive is prepared from the following components in parts by mass: 7-10 parts of E51 type bisphenol A diglycidyl ether, 3.5 parts of a phenolic aldehyde amine T31 curing agent and 1-3 parts of synthetic polyurethane, the synthetic polyurethane is prepared from polyether triol, polyether amine, isophorone diisocyanate and glycerol carbonate, and a blending system of the synthetic polyurethane and bisphenol A diglycidyl ether is adopted to be subjected to covalent crosslinking with phenolic aldehyde amine T31, so that the adhesive has high toughness and strength guarantee; the synthetic polyurethane prepared by the method is obtained through simple, green and efficient solvent-free synthesis, and the synthesized product has certain fluidity at room temperature, so that the subsequent stirring preparation process of an adhesive is facilitated. And a solvent-free synthesis method is adopted, so that the use of a toxic organic solvent in the traditional polyurethane synthesis process is avoided, and the synthesis process is greener.

The present invention relates to the field of polyurethane materials and particularly to a temperature-induced color-changing vehicle film and a preparation method therefor. The method of the present invention comprises: firstly, using polyurethane to wrap vanadium dioxide powder to obtain color-changing microcapsules; then using 1,1,1,3,5,5,5-heptamethyltrisiloxane and 3-allyloxy-1,2-propanediol as raw materials to synthesize an organosilicon-modified diol, and enabling trimellitic anhydride to react with toluene diisocyanate to synthesize a dicarboximide compound; enabling the organosilicon-modified diol and the dicarboximide compound to undergo an esterification reaction and a polymerization reaction to obtain an organosilicon-modified imide polyester diol; then mixing the organosilicon-modified imide polyester diol with polytetrahydrofuran ether glycol 2000, and then enabling the mixture to react with toluene diisocyanate to obtain a polyurethane elastomer; and mixing the polyurethane elastomer, the color-changing microcapsules, a silane coupling agent, a plasticizer, an antioxidant, and an ultraviolet light absorber, followed by melt extrusion and blow molding into a film, so as to obtain the temperature-induced color-changing vehicle film.

The invention discloses environmentally degradable plastic as well as a preparation method and application thereof, and belongs to the technical field of degradable plastic. The degradable modified plastic is prepared from the following raw materials: polylactic acid, poly (butylene terephthalate)-adipate, modified thermoplastic starch, modified cellulose, poly (butylene succinate), epoxidized soybean oil, polyvinyl alcohol, glycerol monolaurate and ethylenediaminetetraacetic acid. Wherein the modified thermoplastic starch is obtained by thermoplastic modification of starch through a plasticizer and modification of castor oil and toluene diisocynate; the modified cellulose is obtained by modifying cellulose acetate with chitosan. By regulating and controlling the types and proportions of the raw materials for preparing the plastic, the plastic with excellent degradation performance and mechanical performance can be obtained, the shopping bag is prepared from the plastic, the loading capacity can be remarkably improved, the plastic is easily degraded by microorganisms in the environment after being discarded, and environmental pollution is avoided.

The invention relates to polyurethane foam plastic as well as a preparation method and application thereof, and mainly solves the problem that when bio-based polyether is used for foaming in the prior art, the compression deformation of foam is poor, so that a product cannot be recovered after being compressed and wrapped. The invention adopts a polyurethane foam plastic and a preparation method thereof, the polyurethane foam plastic is composed of a component A and a component B, the weight percentage of the component A to the component B is 100: 40-60, the component A comprises the following components in parts by weight: 40-60 parts of polyether polyol A1, 5-20 parts of slow-rebound polyether polyol A2, 5-20 parts of bifunctional low-molecular polyether polyol A3, 5-20 parts of bio-based polyether polyol A4 and 0-10 parts of polymer polyol A5, and the component B comprises the following components in parts by weight: 10-20 parts of polyether polyol A1, 5-20 parts of slow-rebound polyether polyol A2, 5-20 parts of bifunctional low-molecular polyether polyol A3, 5-20 parts of bio-based polyether polyol A4 and 0-10 parts of polymer polyol A5. The component A is diphenylmethane diisocyanate, the component B is diphenylmethane diisocyanate subjected to black material modification by using carbon dioxide polyether polyol, the problem is well solved, and the low-resilience pillow material can be applied to slow-resilience pillows.

The invention relates to the technical field of PU synthetic leather, and discloses flame-retardant PU synthetic leather, which comprises a base layer, a flame-retardant middle layer and a surface functional layer, the flame-retardant middle layer is prepared by mixing modified PU resin, a composite flame retardant, a synergist and a cross-linking agent, the composite flame retardant is prepared by compounding an organic phosphorus-nitrogen flame retardant and nano magnesium hydroxide according to a mass ratio of 3: 1-5: 1, and the surface functional layer is prepared by mixing modified PU resin, a composite flame retardant, a synergist and a cross-linking agent. The synergist is modified montmorillonite, the surface functional layer is a blend of fluorine-containing polyurethane resin and flame-retardant silicone oil, and the three-layer structure is integrally formed through a hot melting compounding process. The modified PU resin is prepared from polycarbonate diol, isophorone diisocyanate and a chain extender through a reaction. Three-dimensional flame-retardant protection from inside to outside can be achieved through the collaborative design of the base layer flame-retardant pretreatment layer, the flame-retardant middle layer and the surface functional layer, a finished product can reach a high flame-retardant grade, combustion spreading is effectively inhibited, release of smoke and toxic gas is reduced, and the problems that traditional PU synthetic leather is poor in flame retardance and prone to melting and dripping are solved.

The invention provides a perfluoroethanone microcapsule and a preparation method thereof, and belongs to the technical field of fire extinguishing materials, the perfluoroethanone microcapsule comprises a core and a shell layer; the core comprises perfluorohexanone and fumed silica; the shell layer comprises isophorone diisocyanate, diethylenetriamine and a chlorine-containing monomer, and the isophorone diisocyanate, the diethylenetriamine and the chlorine-containing monomer are subjected to an interfacial polymerization reaction to form a polyurea-polyurethane hybrid network; the mass ratio of the shell to the core of the microcapsule is 1: (5-20); the anhydrous microcapsule core is constructed through an oil-in-oil type anhydrous interfacial polymerization system, so that the hydrolysis side reaction is fundamentally avoided, the microcapsule has higher stable encapsulation efficiency, and the reliability and long-term effectiveness of the product in the storage and use processes are ensured.

The invention relates to the technical field of synthetic leather, in particular to super-soft waterborne polyurethane leather and a preparation method thereof. The leather sequentially comprises a surface layer, a middle layer and a bottom layer from top to bottom, wherein the surface layer is composed of a PCL-PEG-PCL flexible film; the bottom layer is composed of base cloth and a PCL-PEG-PCL flexible film coated on the surface of the base cloth; and the middle layer is composed of modified waterborne polyurethane prepared from PCL-PEG-PCL flexible dihydric alcohol and aliphatic linear chain diisocyanate. The preparation method comprises the following steps: synthesizing PCL-PEG-PCL dihydric alcohol, preparing each layer, and performing condensation reaction on the middle layer and the surface / bottom layer to realize chemical curing. The leather is normally super-soft, the stress strength is remarkably improved, a full-water-based system is environment-friendly, the low-temperature stability and interlayer binding strength are excellent, and the leather is suitable for the field of high-end flexible materials such as furniture veneers, automobile interiors and shoe materials.

The invention discloses an organic silicon modified polyurethane-acrylate composite emulsion and a preparation method of the organic silicon modified polyurethane-acrylate composite emulsion, and relates to the technical field of polymer composite emulsions. Comprising the following raw materials: 70 to 120 parts of oligomer polyol with an average molecular weight of 500 to 2000, 5 to 15 parts of a composite organosilicon component, 40 to 80 parts of diisocyanate, 0.05 to 0.2 part of a catalyst, 2 to 5 parts of a hydrophilic chain extender, 3 to 6 parts of a self-crosslinking hydrophilic chain extender, 4 to 12 parts of a neutralizer, 2 to 8 parts of a water-based chain extender and 50 to 150 parts of an acrylate monomer. 1-5 parts of an acrylate functional monomer, 1-3 parts of a cross-linking agent, 2-8 parts of an emulsifier and 0.5-3 parts of an initiator; the organic silicon modified polyurethane-acrylate composite emulsion prepared by the invention has a composite core-shell structure taking organic silicon modified polyurethane as a core and an acrylate polymer as a shell, so that the emulsion can form a more compact and more stable three-dimensional cross-linked network during film formation, and the weather resistance, water resistance, mechanical strength and surface glossiness of a coating film are remarkably improved.

The invention discloses efficient flame-retardant antibacterial polyurethane synthetic leather and a preparation method thereof, and relates to the technical field of polyurethane synthetic leather, the polyurethane synthetic leather comprises a base cloth layer and a polyurethane functional layer covering the surface of the base cloth layer; the polyurethane functional layer is prepared from the following components in parts by weight: 80 to 95 parts of polyether polyol, 30 to 45 parts of diisocyanate, 5 to 10 parts of a composite flame retardant, 3 to 6 parts of a synergistic flame retardant, 0.5 to 1.5 parts of an antibacterial agent, 2 to 4 parts of a chain extender and 0.05 to 0.2 part of a catalyst. According to the efficient flame-retardant antibacterial polyurethane synthetic leather provided by the invention, the synthetic leather has excellent flame-retardant grade and good antibacterial property and mechanical property, and the preparation method disclosed by the invention is simple in process and suitable for industrial production.

The invention discloses a preparation method of a photo-thermal conversion-phase change heat storage polyurethane flexible film, and relates to the technical field of polyurethane phase change materials. According to the invention, polyethylene glycol is used as a polymeric monomer and a phase change heat storage substrate, diisocyanate and dimethylolbutyric acid are used as reaction monomers, any one of 3, 3-dithio-bis-propionyl hydrazide or (R, R)-3, 3 '-diseleno-bis (2-aminopropionic acid) is used as a cross-linking agent, and transition metal carboxylate and a nano photo-thermal conversion agent are introduced to prepare the phase change heat storage material. And the polyurethane flexible film with photo-thermal conversion-phase change heat storage is prepared. A hydrazide group at the tail end of a cross-linking agent and an isocyanate group are subjected to nucleophilic addition reaction to generate a hydrazide-urea structure of which the main chain contains disulfide bonds and constructs multiple hydrogen bonds, and meanwhile, a metal carboxylate coordination bond is introduced, so that the film is endowed with an excellent mechanical response effect in a wide temperature range; the nano photo-thermal conversion agent is added into the system, so that the system has good photo-thermal conversion performance.

The invention belongs to the technical field of high polymer materials, and particularly relates to a fluorescent liquid crystal polyurethane material as well as a preparation method and application thereof. According to the invention, hydroxyl and a flexible spacer-CH2-are introduced to cyanostilbene to synthesize a dihydroxyl-containing cyanostilbene compound as a dihydroxyl fluorescent liquid crystal monomer. A linear polyurethane material is prepared by taking a dihydroxyl fluorescent liquid crystal monomer and diisocyanate as raw materials, and a structural unit of cyanostilbene is directly introduced into a main chain structure of polyurethane in a chemical bonding manner, so that fluorescent / liquid crystal units are uniformly and stably distributed in a polymer main chain; the fluorescent liquid crystal polyurethane material integrating high mechanical property, good processability and stable fluorescence characteristic is obtained. The fluorescent liquid crystal polyurethane material can provide a multifunctional solution in wider fields of data storage, coding anti-counterfeiting, intelligent sensing, flexible electronics, shape memory materials, photoelectric display devices, optical fiber communication, biomedicine and the like.

The invention discloses a high-temperature-resistant flame-retardant wire harness and a preparation method thereof, and relates to the technical field of electric harnesses. The method comprises the following steps: firstly, introducing phosphorus and silicon flame-retardant elements on a polyethylene molecular chain through plasma activation and free radical grafting reaction to prepare phosphorus-silicon grafted modified polyethylene, then compounding aminated silicon dioxide and organic intercalated montmorillonite by using isophorone diisocyanate as a bridging agent to prepare the phosphorus-silicon grafted modified polyethylene composite material. The preparation method comprises the following steps: preparing an isocyanate-bridged silicon dioxide-montmorillonite composite filler to improve the dispersity and compatibility of the filler in a matrix, carrying out extrusion granulation on modified polyethylene, an ethylene-butyl acrylate copolymer, maleic anhydride grafted polyethylene, the composite filler, nano magnesium hydroxide and other additives to prepare polyethylene wire harness particles, and finally, carrying out extrusion granulation on the polyethylene wire harness particles to prepare the cable harness. And coating the surface of a copper core wire with the particles through a single-screw extrusion coating machine, and carrying out subsequent water cooling, steam treatment, drying and rolling to obtain a finished wire harness. The wire harness prepared by the invention has excellent high temperature resistance and flame retardance.

The invention belongs to the technical field of polyurethane materials, and provides high-frequency high-damping low-compression permanent deformation polyurethane and a preparation method and application thereof.The high-frequency high-damping low-compression permanent deformation polyurethane is prepared from a polyol component and an isocyanate component according to the proportion that the isocyanate index is 1.05-1.15; wherein the polyol component is prepared from the following components in parts by mass: 60 to 80 parts of polyether polyol, 15 to 25 parts of a chain extender, 15 to 25 parts of a damping agent, 3 to 8 parts of nano montmorillonite, 0.03 to 0.08 part of a catalyst and 0.5 to 1.5 parts of an antioxidant; the isocyanate component is a mixture of 4, 4 '-diphenylmethane diisocyanate and hexamethylene diisocyanate in a mass ratio of (2.5-3): 1; the polyurethane material is good in damping performance and low in compression set, has certain flame retardant property, is used for preparing the base plate for the railway, has excellent vibration and noise reduction and steel rail stripping and abrasion inhibition effects, and remarkably prolongs the service life of the steel rail.

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 provides polyurethane serving as a hot melt adhesive and alcosol water as well as a preparation method and application thereof, and relates to the technical field of polyurethane binders. The preparation method comprises the following steps: mixing polydihydric alcohol, diisocyanate, an organic solvent and a catalyst to carry out polymerization reaction, and then mixing with chain extenders (dihydric alcohol containing 2-ureido-4-pyrimidone groups and dihydric alcohol containing bipyridine groups) to carry out chain extension reaction to obtain polyurethane. According to the invention, 2-ureido-4-pyrimidone and dipyridyl groups are introduced into a macromolecular chain of polyurethane, and a formed hydrogen bond can provide strong intermolecular cohesion in the adhesive, so that the strength of the material is improved, and the adhesive force with the surface of a base material can be enhanced; the bipyridine group can form a chelating structure with metal ions on the surface of a metal substrate, so that the bonding strength with the metal substrate is enhanced. According to the invention, a single polyurethane material has dual functions of hot-melt bonding and normal-temperature green solvent bonding, and has excellent bonding performance and milder bonding conditions.

The invention discloses an inorganic-organic hybrid cross-linked network high-toughness material and a preparation method thereof, and belongs to the technical field of engineering material preparation. The high-toughness material is composed of an inorganic phase component and an organic phase component, the inorganic phase component is prepared from 5 to 10 parts of amino modified silicon dioxide nanoring; the organic phase component is prepared from the following components in parts by weight: 90 to 105 parts of polycaprolactone glycol, 14.5 to 16.5 parts of isophorone diisocyanate, 0.8 to 1.5 parts of dibutyltin dilaurate, 4 to 6 parts of bis-catechol borane and 6 to 10 parts of polydopamine nano particles. The fracture performance of the material can reach 20 kJ / m or above and is far higher than-1 kJ / m of a common elastomer and-10 kJ / m of high-toughness hydrogel, and meanwhile the tensile strength of 30 MPa or above is kept. According to the material disclosed by the invention, the dynamic borate bond is utilized, after the material is in contact with a damaged section, efficient self-repairing can be realized after the material is placed at room temperature for 24 hours, and the repairing efficiency is gt; by heating and applying pressure, the whole material can be reshaped through fracture and recombination of the dynamic bonds, and green and sustainable effects are achieved.

The invention provides a heat-conducting water-blocking sealant, a preparation method thereof and a photovoltaic module. The heat-conducting and water-blocking sealant is prepared from the following raw materials in parts by mass: 50 to 100 parts of methyl vinyl siloxane, 50 to 100 parts of lignin, 10 to 50 parts of diamond particles and / or diamond alloy particles, 0.5 to 10 parts of a first cross-linking agent, 0.5 to 10 parts of a second cross-linking agent, 0.5 to 5 parts of a coupling agent and 0.05 to 1 part of a catalyst, wherein the first cross-linking agent is prepared from one or more of dicumyl peroxide, benzoyl peroxide, toluene diisocynate and hexamethylene diisocyanate; the second cross-linking agent comprises polymethylhydrosiloxane. The heat-conducting and water-blocking sealant disclosed by the invention has relatively good heat-conducting property, water-blocking property and electrical insulation property.

The invention discloses dynamic reversible hydrogen bond regulation type nano calcium carbonate as well as a preparation method and application thereof. The preparation method comprises the following steps: preparation of nano calcium carbonate slurry: treating limestone to obtain the nano calcium carbonate slurry; synthesizing a dynamic hydrogen bond modifier: mixing hexamethylene diisocyanate and diethanol amine, adding a catalyst, and reacting to obtain a ureido-containing prepolymer; adding glycerol and monobutyl phosphate into the prepolymer for further reaction to obtain an intermediate; mixing the intermediate with polyethylene glycol, and reacting to obtain a dynamic hydrogen bond modifier; and preparing a nano calcium carbonate product: adding a dynamic hydrogen bond modifier into the nano calcium carbonate slurry, stirring for reaction, and then carrying out filter pressing dehydration, drying and crushing to obtain the nano calcium carbonate product. After the prepared nano calcium carbonate product is applied to the automobile primer, synergistic balance of high yield value and low Bingham viscosity of the automobile primer is realized, and performance improvement and constructability are well coordinated.

The invention belongs to the technical field of new energy materials, and particularly relates to a solid electrolyte material for a lithium battery and a preparation method thereof. The solid electrolyte material for the lithium battery is a polyurethane elastomer and consists of a polyether ion conduction soft segment and an isocyanate crosslinking hard segment, the soft segment is selected from polyether polyol and accounts for 66-90% of the total mass of the polyurethane elastomer; the hard segment is formed by reacting diisocyanate with a chain extender, and accounts for 10-34% of the total mass of the polyurethane elastomer; and the ether solvent is sealed in the soft segment phase by the polymer network. The polyurethane elastomer disclosed by the invention has high ionic conductivity, excellent mechanical property and good interface compatibility, and can be suitable for different types of lithium batteries, such as lithium ion batteries, lithium metal batteries, high-voltage lithium ion batteries and the like; and the preparation process is simple and suitable for large-scale industrial production.

The invention relates to the technical field of modified composite materials, in particular to a polyamide-imide polymer, a preparation method of the polyamide-imide polymer, a sizing agent, a fiber-reinforced special engineering composite material and a preparation method of the fiber-reinforced special engineering composite material. The polyamide-imide polymer is formed by polymerizing a first monomer and a second monomer, and the first monomer is an aryl polyanhydride monomer; the second monomer is a diamine monomer or a diisocyanate monomer. The polyamide-imide polymer is used as a sizing agent to compound the fiber material and the special engineering plastic, so that the defects of the carbon fiber in spreadability, compatibility with a resin matrix, heat resistance, interface performance and the like can be overcome and enhanced, and the matching enhancement of other inorganic fibers can be realized; the interface multifunctional modification performance optimization of the carbon fiber reinforced high-performance thermoplastic resin matrix composite material is realized.

The invention discloses a flame-retardant low-VOCs aqueous adhesive and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a pre-emulsion; S2, synthesizing a resin emulsion; S3, preparing a flame-retardant dispersion; the phosphate flame-retardant monomer participates in the copolymerization reaction of acrylate, and cooperates with hyperbranched ammonium polyphosphate and zinc borate to form a condensed phase and gas phase dual flame-retardant barrier; hydroxyl-containing phosphate is embedded into a solvent-free polyurethane curing agent system, so that aliphatic diisocyanate synchronously completes crosslinking, flame retardance and thickening under the action of an organic tin catalyst, and VOCs introduced by a traditional thickening agent are eliminated from the source; the final value of the NCO content is accurately controlled through a synchronous dropwise adding process and dynamic monitoring of the NCO content, so that the viscosity is stable, and sedimentation and layering are avoided; the long-standing contradiction of high flame retardance, namely high VOCs, and strong adhesion, namely weak constructability, in the field of waterborne adhesives is solved.

The invention discloses a double dynamic bond self-repairing polyurethane elastomer as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The elastomer is prepared from the following raw materials in percentage by mass: 74 to 76 percent of polyether polyol, 15.5 to 18 percent of diisocyanate, 1.67 to 7 percent of dihydrazide compound and 2.1 to 6.7 percent of disulfide. The preparation method comprises the following steps: firstly, reacting polyether polyol with diisocyanate to obtain a prepolymer, then sequentially carrying out step-by-step chain extension reaction on the prepolymer, the bishydrazide compound and the disulfide compound, and finally, curing and forming. According to the invention, a synergistic structure of a hydrogen bond hard segment and a disulfide bond soft segment is constructed step by step, so that the material has high mechanical properties and efficient self-repairing capability. The elastomer is suitable for the fields of industrial pipeline sealing pieces, flexible packaging films, sports equipment accessories and the like, and solves the problem that the strength and repairing performance of an existing self-repairing polyurethane material are difficult to balance.

The invention discloses a bio-based modified high polymer material and a preparation method thereof, and relates to the technical field of high polymer materials. When the bio-based modified high polymer material is prepared, firstly, lignin reacts with terephthalaldehyde to prepare formylated lignin; carrying out multi-component reaction on the aldehyde lignin to obtain modified lignin; the preparation method comprises the following steps: reacting 4-mercaptophenylboronic acid with 1-mercaptoglycerol to prepare a dimercaptoborate cross-linking agent; the preparation method comprises the following steps: reacting isophorone diisocyanate with polytetrahydrofuran ether glycol, and then reacting with a flame-retardant chain extender, 1, 2-propylene glycol and hydroxyethyl methylacrylate to prepare modified polyurethane; and mixing the modified polyurethane, the modified lignin and a dimercaptoborate cross-linking agent, casting and curing to obtain the bio-based modified high polymer material. The bio-based modified high polymer material prepared by the invention has the advantages of flame retardance, antibacterial property, aging resistance, self-repairing property, repeatable processing and high mechanical strength.

The invention relates to a carbon nano reinforced thermoplastic polyurethane composite material as well as a preparation method and application thereof. The composite material is prepared from the following components in parts by mass: 5 to 20 parts of diisocyanate, 10 to 30 parts of oligomer dihydric alcohol, 1 to 10 parts of bifunctional chain extender and 1 to 20 parts of filler, the filler is prepared from the following components in parts by mass: 0.95 to 18 parts of inorganic filler and 0.05 to 2 parts of carbon-based nano filler; preparing a carbon-based nanofiller of flaky carbon nanofibers, tubular carbon nanofibers or fishbone-shaped carbon nanofibers from reaction gas by using a metal catalyst through a chemical vapor deposition method; the metal catalyst is selected from an iron-nickel catalyst or a nickel-copper catalyst, the reaction gas comprises a carbon source gas and a reducing gas, the carbon source gas is selected from carbon monoxide or ethylene, and the reducing gas adopts hydrogen. Compared with the prior art, the material has good mechanical properties and damping performance, especially has excellent normal-temperature damping performance and damping temperature range, and is suitable for 3D printing.

The invention discloses surface-modified self-repairing polyurethane, a friction nano-generator, a preparation method and application, and belongs to the technical field of material scientificity, and the preparation method of the surface-modified self-repairing polyurethane comprises the following steps: uniformly mixing a fluorine-containing group compound and hexamethylene diisocyanate, and carrying out heating reaction, extraction and drying to obtain the surface-modified self-repairing polyurethane. Mixing with serinol, dissolving in an organic solvent, heating for reaction, and drying to obtain a fluorine-containing group chain extender; and dissolving a quadruple hydrogen bond-containing chain extender and a fluorine-containing group chain extender in an organic solvent, adding the isocyanate-terminated polyurethane prepolymer, and carrying out stirring reaction, mold reversing and drying to obtain the surface-modified self-repairing polyurethane. The self-repairing polyurethane can effectively improve the environmental adaptability and the service life of the friction nanometer generator. The surface charge transfer efficiency is enhanced due to good conductivity, and the power generation performance is improved; meanwhile, the mechanical property is enhanced through hydrogen bond crosslinking, so that compared with traditional equipment, the environment universality is better.

Provided is a binder for an electrode of a lithium secondary battery, said binder being capable of suppressing an increase in internal resistance due to charge and discharge. A binder for an electrode of a lithium secondary battery according to an embodiment contains an aqueous dispersion of a polyurethane salt obtained by reacting components (A), (B), (C), and (D), the polyurethane salt substantially not containing a structure derived from an amine-based chain extender: (A) a polyisocyanate component; the polyurethane resin contains at least one selected from the group consisting of diphenylmethane diisocyanate and a modified body thereof; (B) a polyol component comprising a hydrogenated polybutadiene polyol; (C) carboxylic acid containing an active hydrogen group; and (D) water as a chain extender.

The invention discloses a low-free-monomer waterborne polyurethane adhesive and a preparation method thereof, and relates to the technical field of adhesive preparation, the low-free-monomer waterborne polyurethane adhesive comprises a main chain structure composition, a functional additive, a reaction control and optimization additive and an auxiliary reagent, the main chain structure composition comprises low-monomer residual diisocyanate and polymer polyol, and the functional additive comprises a low-free-monomer residual diisocyanate and a low-free-monomer residual diisocyanate; by introducing a flexible chain segment and optimizing an emulsification process, an adhesive film has better hydrophobicity and a microcosmic phase separation structure, the water soaking resistance is greatly improved, the adhesive film has outstanding water resistance, a unique formula design ensures that an adhesive layer cannot be subjected to strength attenuation due to aging in a long-term use process, the bonding durability is excellent, and the adhesive film has a good application prospect. The preparation method has the advantages of reasonable process design, mild and controllable reaction conditions, good process applicability and good storage stability, and through stabilization treatment, the obtained emulsion has the advantages of uniform particle size, good mechanical stability and storage stability, and long shelf life.