787 results about "Extender" patented technology

The invention relates to a self-repairing high-mechanical-property film and a preparation method and application thereof, and the preparation method comprises the following steps: adding ureido pyrimidone and a chain extender into a solvent to obtain a mixed solution, adding the mixed solution into a polyurethane prepolymer, reacting, and drying to obtain the self-repairing high-mechanical-property film. UPy containing hydrogen bonds is introduced into the polymer to prepare the self-repairing high-mechanical-property film, and the hydrogen bond density can be adjusted by adjusting the UPy content of ureido pyrimidone, so that the composite material has excellent self-healing property; and density hydrogen bonds are introduced to construct a physical cross-linked network, so that the mechanical properties of the composite material can be remarkably improved.

The invention relates to a preparation method of a polyurethane-based flexible phase-change material and a battery heat management device. Polyethylene glycol is used as a phase-change material, and adipic dihydrazide (ADH) and 4, 4 '-diphenyltetracarboxylic dianhydride (ADH) are integrated at a condensation end of a heat pipe; at least one of 4, 4 '-diaminobenzanilide (DABA) is used as a cross-linking agent, and at least one of HMDI or IPDI is used as a chain extender to prepare the polyurethane-based flexible phase change material with enthalpy value, flexible rigidity and appropriate phase change temperature. The material not only has excellent mechanical strength and thermal stability, but also has healing property, recoverability and shape memory function. The polyurethane-based flexible phase change material serves as an energy storage film and forms a sealing structure with the condensation end through mechanical pressing. When the temperature rises, the energy storage film B1 absorbs heat and expands, the contact area with the outside is increased, the heat dissipation power is improved, and the heat dissipation efficiency and the heat load management capacity are remarkably improved by maximizing the heat transfer area and utilizing the high latent heat characteristic.

The invention relates to the technical field of films, in particular to a flexible film special for a handwriting board and a preparation method of the flexible film. The flexible film is obtained by coating a release film with coating slurry and carrying out thermocuring, wherein the coating slurry contains modified polyurethane, a flatting agent, a defoaming agent and ethyl acetate. According to the modified polyurethane, polycarbonate diol, isophorone diisocyanate and other raw materials are subjected to a reaction, and a nano particle chain extender containing disulfide bonds is added. The nano particle chain extender containing disulfide bonds is prepared by modifying nano silicon dioxide and grafting cystamine dihydrochloride and diamino polyethylene glycol. Through nanoparticle surface modification and dynamic disulfide bond network construction, molecular-level coupling of a rigid reinforced phase and a flexible substrate, inhibition of nanoparticle aggregation and balance of strength and toughness are realized, the dynamic disulfide bond network can self-repair microcracks, and a high-quality special flexible film solution is provided for a high-performance handwriting board.

The invention provides an antifouling self-cleaning fluorocarbon finish paint as well as a preparation method and application thereof, and particularly relates to the technical field of special coatings. The antifouling self-cleaning fluorocarbon finish paint is composed of a component A and a component B in a ratio of (80-87): 16, the component A is prepared from the following components in parts by weight: 560 to 580 parts of fluorocarbon resin, 30 to 35 parts of a first solvent, 20 to 40 parts of a second solvent, 180 to 220 parts of titanium dioxide, 90 to 110 parts of filler, 11 to 20 parts of a light stabilizer, 3 to 5 parts of a thickening agent and 13 to 28 parts of an auxiliary agent; the component B comprises the following components in parts by weight: 20-22 parts of fluorocarbon resin, 4-5 parts of a chain extender, 15-20 parts of a diamine curing agent, 15-20 parts of a polyamine curing agent and 25-35 parts of a second solvent. According to the finishing paint, on the basis of enhancing the self-cleaning capability, the weather resistance of a coating is improved, and the aging and damage of the coating are delayed, so that the service life of the coating is prolonged.

The invention relates to a thermal interface composite material with heat transfer performance and heating rheological property and a preparation method thereof, the preparation method comprises the following steps: adding ureido pyrimidone and a chain extender into a solvent to obtain a mixed solution, adding the mixed solution into a polyurethane prepolymer for reaction to obtain the polyurethane prepolymer containing ureido pyrimidone; adding hydroxylated boron nitride nanosheets into the polyurethane prepolymer containing the ureido pyrimidone, stirring, and drying, so as to obtain the thermal interface composite material. The preparation method comprises the following steps: introducing hydrogen bond-containing ureido pyrimidone UPy into polyurethane, constructing density hydrogen bonds among polymer chains, enabling a polyurethane prepolymer PUUPy to have a certain rheological property, introducing hydroxylated boron nitride nanosheets in a non-covalent manner, constructing a heat conduction path in the polymer while not influencing the rheological property of the material, and improving the heat conduction performance of the material. The composite material is endowed with heat-conducting property, and the prepared composite material has efficient heat transfer property and heating rheological property.

The invention belongs to the technical field of polyurethane waterproof coatings, and particularly relates to a single-component fluorine-free high-hydrophobicity polyurethane waterproof coating and a preparation method thereof, and the single-component fluorine-free high-hydrophobicity polyurethane waterproof coating comprises the following raw materials by weight: 60-80 parts of composite polyether polyol; 20 to 40 parts of silane modified polyether polyol; 11 to 17 parts of diisocyanate; 2-5 parts of a chain extender; 50 to 70 parts of a plasticizer; 50 to 70 parts of filler; 0.15 to 0.2 part of a catalyst; and 3-5 parts of an auxiliary agent. A polyoxypentene ether chain segment, a castor oil-based structure and a silane group are introduced into the molecular structure of the waterproof coating through chemical modification, the intrinsic hydrophobic and mechanical properties of the material are improved, the migration defect caused by addition of a hydrophobic agent and silicone oil in a traditional preparation method is overcome, and the invention further provides a preparation method of the waterproof coating.

The invention discloses a low-staining low-viscosity waterborne polyurethane macromolecular coloring agent and a preparation method of the low-staining low-viscosity waterborne polyurethane macromolecular coloring agent. Comprising the following components in parts by weight: 15 to 30 parts of aliphatic diisocyanate, 15 to 30 parts of micromolecular dye, 10 to 30 parts of polypropylene glycol and / or dihydroxy silicone oil, 25 to 50 parts of polyethylene glycol, 1 to 3 parts of micromolecular dihydroxy compound chain extender, 0.05 to 0.3 part of catalyst, 90 to 140 parts of acetone and 50 to 300 parts of water. By designing the hydrophilicity and proportion of the soft and hard segments of the polyurethane coloring agent, the waterborne polyurethane macromolecular coloring agent color paste which is low in staining, easy to clean, less than 1000mpas in product viscosity, more than 5% in color concentration and more than 5% in dye equivalent and good in compatibility is finally obtained, and the waterborne polyurethane macromolecular coloring agent color paste can meet the requirements of liquid product coloring agents such as clothing care and household cleaning agents. The cleaning agent can also be used for liquid cleaning agent products for body care and catering.

The invention discloses resin composite liquid with dual self-repairing and high ethanol solvent wiping resistance as well as a preparation method and application of the resin composite liquid, and belongs to the technical field of polyurethane emulsion coatings. Aiming at the problems that an existing waterborne polyurethane coating is poor in ethanol resistance due to residual carboxyl / hydroxyl of a hydrophilic chain extender and the self-repairing efficiency of a single dynamic bond is low, a metal ion buffer solution is added into a hydroxyl-terminated polyurethane emulsion to coordinate with the carboxyl of the hydrophilic chain extender, so that a hydrophilic group is closed, and the crosslinking density is increased; meanwhile, a boric acid compound is introduced to form dynamic boric acid ester bonds with residual hydroxyl groups of the system, and hydrophilic groups in the system are consumed while a dual self-repairing network is constructed. The coating prepared by the invention has good self-repairing and ethanol wiping resistance.

The invention discloses a preparation method of a noise-reducing anti-corrosion multifunctional coating, which comprises the following steps: mixing a polydimethylsiloxane prepolymer with a curing agent, casting on a glass sheet, curing, demolding to obtain a film substrate, and carrying out laser perforation treatment on the film substrate to obtain a low-frequency noise-reducing film substrate; taking the low-frequency noise reduction film substrate as a directional receiving plane, and performing electrostatic spinning treatment to obtain the low-frequency noise reduction film; uniformly mixing aliphatic isocyanate, polyether polyol, a chain extender, a catalyst, a conductive filler, a heat-conducting filler, porous titanium dioxide, a defoaming agent, a dispersing agent and a latent curing agent, and treating to obtain an anti-corrosion damping coating; the surface of a target base body is sequentially coated with the anti-corrosion damping coating, the low-frequency noise reduction film and the anti-corrosion damping coating, and the noise reduction and anti-corrosion multifunctional coating is obtained; the problems that in the prior art, due to separation of low-frequency noise reduction and anti-corrosion functions, construction is complex, cost is high, the effect is limited, and signal transmission quality and equipment durability are difficult to consider at the same time are solved.

The invention provides a polyurethane composite material and application thereof, and relates to the technical field of polyurethane materials. The polyurethane composite material consists of a component A and a component B, the component A comprises the following raw material components in parts by weight: 100 parts of polymer dihydric alcohol, 1-8 parts of a chain extender, 1-3 parts of a catalyst, 0-5 parts of a cross-linking agent, 0.1-2 parts of a carbon-based material, 1-10 parts of an anthraquinone compound and 0.5-2 parts of water; and the component B is an isocyanate curing agent and comprises a prepolymer with a plurality of ester bonds and urea bonds. The polyurethane composite material disclosed by the invention has relatively high mechanical strength, wear resistance and the like, and is suitable for treating nitrogen-containing sewage.

The invention provides unsaturated waterborne polyurethane, a polyurethane composite material as well as a preparation method and application of the unsaturated waterborne polyurethane and the polyurethane composite material. According to the preparation method, isocyanate is introduced into a soft segment through a block process, an unsaturated chain extender is added, unsaturated double bonds are introduced, and waterborne polyurethane with excellent performance is prepared. Meanwhile, cellulose nanofibers are added into the unsaturated waterborne polyurethane, so that the interfacial compatibility and mechanical properties of the unsaturated waterborne polyurethane are improved. The unsaturated waterborne polyurethane provided by the invention has excellent film-forming property, stability and mechanical property.

The invention relates to the field of polyurethane, and particularly discloses high-barrier water-based polyurethane for packaging. The preparation raw materials of the high-barrier water-based polyurethane for packaging comprise polymeric polyol, isocyanate, a modified composite filler, an ethylene-vinyl alcohol copolymer, maleic anhydride grafted polyethylene, a hydrophilic chain extender, a post-chain extender and water. Wherein aminosilane, polyethylene glycol and carbonyl diimidazole are adopted to carry out synergistic modification on the graphene oxide nanosheets and the glass powder, so that the graphene oxide nanosheets are well dispersed in a polyurethane matrix in a two-dimensional continuous layered structure, and the diffusion path of oxygen, water vapor and other gas molecules in the polyurethane matrix is remarkably prolonged; and the glass powder can fill gaps among graphene oxide nanosheet layers, so that the compactness of the composite material is further enhanced, the permeation of water vapor is reduced, and the barrier property is improved.

The invention belongs to the technical field of polyurethane composite materials, and particularly discloses a preparation method of an aramid nanofiber / polyurethane composite material. The method comprises the following steps: (1) preparing an organic silicon modified polyurethane prepolymer; (2) preparing a fluorinated modified aramid nanofiber (FANF); and (3) uniformly dispersing FANF in a solvent to form a dispersion liquid, adding a chain extender into the organosilicon modified polyurethane prepolymer according to a preset chain extension coefficient, then doping the FANF dispersion liquid, and mixing, curing and molding to obtain the high-performance polyurethane elastomer (PUE). Through the synergistic effect of the rigidity enhancement effect of the aramid nanofibers and the interface lubrication characteristic of the polydimethylsiloxane, the wear resistance and mechanical strength of the material are remarkably improved, and the obtained PUE has excellent tensile strength (gt; 35 MPa) and an elongation at break (gt; 400%), and can be widely applied to the fields of industrial sealing, flexible electronics and high-load transmission parts.

The invention discloses an ultraviolet-aging-resistant high-toughness wind power cable and a preparation method thereof, belongs to the technical field of cable preparation, is used for solving the technical problem that the ultraviolet aging resistance and toughness of a wind power cable in the prior art need to be further improved, and specifically comprises a wire layer, a shielding layer and a sheath layer; the preparation method comprises the following steps: coating an organic silicon layer on the outer side of a nano titanium dioxide particle and modifying amino to obtain a modified chain extender, carrying out chain extension on a long-chain polyurethane structure to obtain composite polyurethane, and carrying out hydrolysis by taking activated glass microspheres as a matrix and tetramethyl orthosilicate as a supplement to obtain modified aerogel. The preparation method comprises the following steps: preparing modified aerogel, modifying ferroferric oxide particles on the modified aerogel by using in-situ loading, further modifying perfluoro groups to obtain composite aerogel, finally mixing composite polyurethane, the composite aerogel and auxiliary materials, and performing melt extrusion to obtain a sheath layer of the wind power cable, thereby obtaining the wind power cable.

The present invention relates to a method for preparing a thermosetting polyurethane elastomer for 3D printing, belonging to the field of rapid prototyping and manufacturing technology. This method utilizes a blocked isocyanate process to quantitatively control the reaction rate of a highly reactive polyurethane system, thereby obtaining a single-component thermosetting polyurethane elastomer stock solution. A polyurethane prepolymer is prepared using diisocyanate and oligomer polyol as raw materials. A blocked prepolymer is then prepared using an active hydrogen-containing blocking agent and a blocked prepolymer. A metered diamine chain extender and catalyst are then added to obtain a single-component thermosetting polyurethane elastomer stock solution. This method quantitatively controls the reaction rate of the highly reactive polyurethane system. The polyurethane elastomer stock solution is stable and low-toxic upon storage at room temperature. The raw material viscosity is adjusted by heating to meet the viscosity requirements for 3D printing, thereby achieving the green production of high-performance polyurethane elastomers.

The invention discloses a wear-resistant coating and application thereof on a leather surface, and belongs to the technical field of leather finishing. The coating comprises a functionalized polyurethane-acrylate composite emulsion, a photoinitiator, an auxiliary agent and deionized water. Wherein the composite emulsion is prepared from hyperbranched polyester polyol, a dynamic bond chain extender and the like through prepolymerization, fluorine-containing grafting and in-situ sol-gel reaction, a hyperbranched skeleton provides mechanical support, double dynamic bonds endow a self-repairing function, in-situ nano-compounding enhances wear resistance, a diurea hydrogen bond enhances binding force, and a fluorine-containing side chain endows a coating with hydrophobic and stain-resistant performance; and preparing the coating by matching with a gradient curing process. The coating prepared by the invention has high wear resistance, efficient self-repairing property, firm adhesive force, excellent stain resistance and leather adaptation flexibility, and meets the actual requirements of middle and high-end leather finishing.

The invention relates to a reaction type closed diamine chain extender, dual-curing photosensitive resin, a 3D printed part and a preparation method, the reaction type closed diamine chain extender is obtained through reaction of a diamine chain extender and a functional monomer, the functional monomer at least comprises a functional group A, a functional group B and a functional group C, the functional group A is an aldehyde group or a ketone group and is used for reacting with an amino group in the diamine chain extender; and a functional group B containing a photocurable unsaturated bond. The reactive closed diamine chain extender provided by the invention participates in a photocuring process, so that the strength of a material in a photocuring stage is improved, the product yield in a printing process is ensured, no by-product is generated during subsequent heat treatment, and the mechanical property of a final finished product is not influenced. The dual-curing photosensitive resin can be stably stored for a long time, the mechanical property of the material can be remarkably improved through the photocuring-heat treatment synergistic effect, and the dual-curing photosensitive resin can be used for photocuring 3D printing technologies such as sinking type SLA and pull-up type DLP and LCD at the same time.

The invention provides polyurethane acrylic photosensitive resin, a preparation method thereof and application of the polyurethane acrylic photosensitive resin in a flexible display screen, and belongs to the field of high polymer materials. The preparation raw materials of the polyurethane acrylic photosensitive resin comprise diisocyanate, a macromolecular chain extender, a micromolecular chain extender, a first end-capping reagent, a second end-capping reagent, a catalyst, a polymerization inhibitor and an active diluent, the macromolecular chain extender is polyester polyol, the micromolecular chain extender is micromolecular dihydric alcohol, the first end-capping reagent is polyether polyol, and the second end-capping reagent is polyether polyol. The first end-capping reagent is acrylic ester containing hydroxyl, and the second end-capping reagent is alkoxy silane containing reactive hydrogen. According to the polyurethane acrylic photosensitive resin disclosed by the invention, a flexible display screen can have high-temperature bending resistance and is free of creases when being bent.

The invention provides an intelligent wearable high-sensitivity visual mechanical sensor and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing a liquid crystal monomer, a chiral agent, a cross-linking agent, a chain extender, a photoinitiator and a catalyst, and carrying out prepolymerization reaction to obtain a first solution; then coating the first solution on the film-shaped PU adhesive to enable the cholesteric liquid crystal to complete evaporation-induced self-assembly, and then irradiating and curing under an ultraviolet lamp to obtain a color-changing film; and finally hot-pressing the color-changing film on the fabric to obtain the intelligent wearable high-sensitivity visual mechanical sensor. The color-changing film and the textile are combined through the PU adhesive, amino in the PU adhesive reacts with carbon-carbon double bonds in the color-changing layer by controlling the chemical composition of the color-changing layer, the color-changing layer and the PU adhesive are combined more firmly, the PU adhesive can permeate into the textile in the hot pressing process, and the color-changing effect is improved. The color-changing layer, the middle layer and the textile are tightly combined, and the wearable force response visual sensor better fitting the three-dimensional curved surface of the human body is prepared.

The present invention discloses a high- and low-temperature resistant environmentally friendly water-based polyurethane coating and a preparation method thereof, belonging to the technical field of chemical coatings. The preparation method comprises: reacting isophorone diisocyanate with cyanuric acid at 80-90°C to generate a prepolymer containing a triazine ring cross-linked network; adding hyperbranched polycaprolactone to the prepolymer, and vacuum dehydrating the prepolymer to form a mixed prepolymer; using dimethylolpropionic acid to extend the chain and neutralizing it with triethylamine, adding a coating additive and shearing and emulsifying to obtain a high- and low-temperature resistant environmentally friendly water-based polyurethane coating. Through the synergistic effect of the rigid triazine ring network and the hyperbranched chain segments, the coating has both brittle crack resistance and creep resistance over a wide temperature range; the amphiphilic chain extender ensures emulsion stability and low VOC content.

The invention relates to the field of printing inks and discloses a wear-resistant and scratch-resistant printing ink, a preparation method thereof, and an application thereof. The printing ink comprises: a modified aqueous polyurethane emulsion, a modified mica sheet, a pigment, an additive, and deionized water; the modified aqueous polyurethane emulsion is prepared by introducing a double-terminal hydroxyl chain extender into a polymer; the double-terminal hydroxyl chain extender is reacted with a Schiff base intermediate obtained by reacting salicylaldehyde and p-aminobenzyl alcohol and isocyanoethyl methacrylate, and the obtained double-bonded Schiff base intermediate is reacted with 1,1,3,3-tetramethyldisiloxane to prepare the ink; the modified mica sheet is reacted with triethylenetetramine, formaldehyde, and acetone, and then formaldehyde is added under alkaline conditions for polycondensation, the obtained cationic polymer and glutaraldehyde are prepared into the cationic mica sheet, and finally polyaniline is grown on the surface of the mica sheet through interfacial polymerization. The ink prepared by the invention has good adhesion, high hardness, and excellent water resistance, wear resistance, heat resistance, antistatic properties, and antibacterial properties.

The invention discloses an underwater anti-fouling and anti-corrosion functional coating as well as a preparation method and application thereof, and relates to the technical field of coating materials. The underwater antifouling and anticorrosive functional coating comprises the following components: a hydrophilic polyether monomer, a hydrophobic polyether monomer, a catalyst, a chain extender, epoxy resin, isocyanate, a hydrophilic solvent, modified epoxy resin and a curing agent. The method has the advantages of mild reaction conditions, simple steps and no need of inert gas protection. The prepared coating has the advantages of both polyurethane and epoxy resin, not only can be stably cured in water, but also shows underwater adhesive force and long-term durability superior to those of a pure epoxy coating. Meanwhile, the coating can effectively prevent underwater crude oil adhesion and biological fouling, and the problems that a traditional coating is single in function, weak in underwater adhesion force or complex in preparation process are solved.

The invention relates to the technical field of preparation of sealing materials, in particular to a photovoltaic module sealant with ultralow water vapor transmittance and a preparation method of the photovoltaic module sealant. The invention discloses a solar cell panel which at least comprises the following components in parts by weight: 4-10 parts of polymer rubber or resin, 25-30 parts of medium molecular weight polyisobutene, 7-15 parts of silane modified resin, 15-20 parts of reinforcing filler, 30-40 parts of incremental filler, 3-8 parts of a drying agent, 0.3-1 part of an antioxidant and 0.3-1 part of an ultraviolet stabilizer. Meanwhile, the anti-aging performance and the processing performance are excellent, so that the photoelectric conversion efficiency of the solar cell is improved, and the service life of the solar cell is prolonged.

The invention discloses a transparent polyurethane elastomer and a preparation method thereof, and relates to the technical field of polyurethane elastomers, the preparation method comprises the following steps: carrying out vacuum dehydration on polytetrahydrofuran ether glycol-2000 and polytetrahydrofuran ether glycol-1000 for later use; the preparation method comprises the following steps: preheating a reaction container, adding isophorone diisocyanate and benzoyl chloride, uniformly stirring, adding polytetrahydrofuran ether glycol-2000 and polytetrahydrofuran ether glycol-1000, and carrying out heat preservation reaction to obtain a polyurethane prepolymer; uniformly stirring polyether polyol N330, a chain extender, dibutyltin dilaurate, silicone oil, a defoaming agent, an antioxidant and an ultraviolet light absorber, carrying out vacuum degassing, adding into the polyurethane prepolymer, uniformly stirring, pouring into a mold, curing, molding and demolding to obtain the transparent polyurethane elastomer.

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 application discloses a kind of high waterproof moisture-permeable polyurethane film materials and high waterproof moisture-permeable fabric, it is related to polyurethane film material technical field, high waterproof moisture-permeable polyurethane film material, including following raw materials: polyether diol, diisocyanate, organic solvent, modified porous biochar, modified diatomite, chain extender, thickening agent, defoaming agent, ultraviolet absorber, dibutyltin dilaurate;The modified porous biochar is prepared by activating corn straw powder by potassium phosphate and potassium hydroxide in cooperation, and polyethylene glycol is added as a dispersant, and the modified porous biochar is treated by mercapto and fluorination modification;By introducing potassium phosphate in cooperation with potassium hydroxide to form an activation system in the preparation of modified porous biochar in polyurethane film material, combined with polyethylene glycol, dispersion optimization and reduction synergy are realized, and the moisture permeability, waterproofness, mechanical properties and durability of the material are improved.

The invention relates to polyurethane resin capable of being coated to form a film for a car cover film and a preparation method of the polyurethane resin, and belongs to the technical field of polyurethane. In order to solve the problems of difficulty in color change, insufficient yellowing resistance, poor mechanical properties and the like of a traditional vehicle cover film material, polyurethane resin is prepared from polyester polyol, diisocyanate, an isocyanate tripolymer, a chain extender, a catalyst and a solvent, and the molar ratio of the polyester polyol to the diisocyanate is (1.05-1.2): 1. The preparation method comprises the following steps: pretreating polyester polyol, adding diisocyanate, isocyanate tripolymer and other raw materials step by step for reaction, and finally preparing the polyurethane resin capable of being directly coated to form a film. The resin formed through chemical bonding does not depend on TPU particle melting film preparation, pigment can be conveniently added to meet the color changing requirement, and meanwhile the resin has excellent yellowing resistance, light transmittance, mechanical strength and wear resistance, is suitable for invisible car cover films and color-changing car cover films and has high market application value.

The invention discloses a photo-thermal dual-curing resin composition as well as a preparation method and application thereof. The photo-thermal dual-curing resin composition is prepared from the following raw material components in percentage by mass: 40 to 70 percent of blocked polyurethane oligomer, 30 to 50 percent of reactive diluent, 2 to 15 percent of diamine chain extender with multiple hydrogen bonds and 0.5 to 3 percent of photoinitiator. The photo-thermal dual-curing resin composition provided by the invention is low in viscosity and good in stability, and can meet the printing requirements of a photo-curing 3D printer at normal temperature, and a printed product has the characteristics of high strength and high toughness.

The invention discloses an aerogel water-based heat insulation coating and a preparation method thereof, belongs to the technical field of coating preparation, and aims to solve the technical problem that the heat insulation performance and the wear resistance of a water-based coating in the prior art need to be further improved. The aerogel-containing waterborne heat insulation coating is prepared from the following raw materials in parts by weight: 70 to 80 parts of modified polyurethane, 10 to 12 parts of hydrophilic aerogel, 8 to 10 parts of modified chain extender and 27 to 36 parts of auxiliary materials, by introducing the modified chain extender, the cross-linking density and char forming capacity of the coating are improved, and the mechanical and flame-retardant properties are enhanced; the hydrophilic aerogel constructs a stable and continuous porous framework, the heat insulation property is improved, and the inner composite glass fiber powder forms a three-dimensional supporting structure, so that the wear resistance and the structural stability are remarkably improved; the modified polyurethane forms a target functional group end cap through chain segment optimization, the dispersing performance of the hydrophilic aerogel is improved, and finally, the high-performance water-based thermal insulation coating is obtained through synergistic cooperation of the three functional components.

The invention discloses an environment-friendly underwater sound absorption polyurethane composite material and a preparation method thereof, the environment-friendly underwater sound absorption polyurethane composite material comprises a prepolymer, a chain extender and a filler, the prepolymer is a polymer obtained by polymerizing polyether and diphenylmethane diisocyanate, and the NCO value of the polymer is 12-18%; the chain extender takes butanediol as a hard segment and polyether and polyether polyol as soft segments; the environment-friendly polyurethane composite material for underwater sound absorption is a sound absorption material which does not contain ricinoleic acid, oleic acid and linoleic acid, can avoid water body pollution caused by explosive propagation of ricinoleic acid, oleic acid and linoleic acid, is used for replacing an existing sound absorption material, and has the advantages that the environment-friendly polyurethane composite material for underwater sound absorption is good in sound absorption effect and good in sound absorption effect. And water pollution is prevented while sound is absorbed.