1453 results about "Endcapping" patented technology

The invention discloses a scratch repair coating and a preparation method thereof, and relates to the technical field of high polymer materials. When the scratch repair coating is prepared, hydroxylated boron nitride reacts with 1-(3-triethoxysilylpropyl)-2-imidazoline to prepare pre-modified boron nitride, and then the pre-modified boron nitride and 4-chloro-1-butene are subjected to quaternization to prepare modified boron nitride; the preparation method comprises the following steps: reacting styryl phosphonic dichloride with 4, 4, 5, 5, 6, 6, 7, 7, 7-nonafluoro-1, 2-heptanediol to prepare a hydroxyl-terminated phosphorus-fluorine-containing polymer; the preparation method comprises the following steps: reacting isophorone diisocyanate with a hydroxyl-terminated phosphorus and fluorine-containing polymer to prepare a polyurethane prepolymer; reacting the polyurethane prepolymer with hydroxyl-terminated coumarin to generate modified polyurethane; and uniformly mixing the modified polyurethane, the modified boron nitride and a photoinitiator to prepare the scratch repair coating. The scratch repairing coating prepared by the invention has good self-repairing performance, flame retardant property, corrosion resistance and mechanical property.

The invention discloses an uvioresistant acrylic resin coating and a preparation method thereof, and belongs to the technical field of acrylic resin paints.The uvioresistant acrylic resin coating is characterized in that step-by-step functional design is adopted, a functional polyurethane prepolymer is constructed through prepolymerization reaction and double-bond end capping, fluorosilicone modified acrylate emulsion is prepared through a core-shell emulsion polymerization process, and the uvioresistant acrylic resin coating is obtained. Then carrying out surface silane modification on hexagonal boron nitride and carrying out composite coating to obtain a modified boron nitride auxiliary agent; and finally, carrying out composite emulsification and dispersion compounding on all the components to obtain the anti-ultraviolet acrylic resin coating. Through the synergistic enhancement effect of the fluorosilicone modified core-shell structure and the surface modified boron nitride, the ultraviolet aging resistance and the insulation reliability of the coating are remarkably improved on the basis of keeping high adhesive force, excellent flexibility and impact resistance of the coating; the problems that a traditional acrylic coating is prone to yellowing and pulverization under long-term ultraviolet radiation, and the mechanical property is reduced are effectively solved, and the acrylic coating is suitable for the field of electronic equipment protective coatings with high requirements for weather resistance, mechanical strength and electrical insulating property.

The invention discloses a quick-curing polyurethane seamless expansion joint material for roads and a preparation method, and belongs to the technical field of road engineering materials. The material is prepared from polyether polyol, polycaprolactone glycol, a bisphenol A epoxy-polyether block isocyanate terminated prepolymer, a methyl phenyl silicon-boron hybrid hydroxyl chain extender, diphenylmethane diisocyanate, calcium carbonate, wollastonite, a hindered amine anti-aging agent and dioctyl phthalate. Wherein the bisphenol A epoxy-polyether block isocyanate terminated prepolymer is prepared by the following steps: reacting bisphenol A with epoxy chloropropane to generate epoxy resin, reacting with polytetramethylene ether glycol, and introducing isophorone diisocyanate; the methyl phenyl silicon-boron hybrid hydroxyl chain extender is prepared by carrying out hydrosilylation and ethylene glycol reaction on methyl trimethoxy silane, 3-glycidyl ether oxypropyl trimethoxy silane and allylboronic acid pinacol ester; and the methyl phenyl silicon-boron hybrid hydroxyl chain extender is prepared by carrying out hydrosilylation on methyl trimethoxy silane, 3-glycidyl ether oxypropyl trimethoxy silane and allylboronic acid pinacol ester. The material has the advantages of quick curing property, weather resistance and high-temperature stability, and is suitable for road seamless expansion joint scenes.

The invention relates to the technical field of preparation of building external wall thermal insulation materials, in particular to a building external wall thermal insulation board based on pearl wool and a preparation method of the building external wall thermal insulation board. The core layer is prepared from the following raw materials in parts by weight: 40 to 60 parts of pearl wool particles, 5 to 15 parts of graphene-loaded expanded graphite, 3 to 10 parts of nano silicon dioxide aerogel, 10 to 20 parts of ammonium polyphosphate, 5 to 12 parts of pentaerythritol, 3 to 8 parts of melamine, 15 to 25 parts of ethylene-vinyl acetate copolymer, 5 to 10 parts of maleic anhydride grafted polyethylene, 2 to 6 parts of nano montmorillonite and 1 to 5 parts of silicon carbide whisker; the composite material is prepared from the following components in parts by weight: 0.5-2 parts of a silane coupling agent KH560, 0.2-0.8 part of an antioxidant 1010, 3-8 parts of amino-terminated polyether and 0.3-1 part of a hindered amine light stabilizer 770. The thermal insulation board is excellent in thermal insulation, mechanical property and flame retardant property, good in weather resistance, stable in size and high in construction adaptability, pearl wool can be recycled, and the thermal insulation board has practical and environment-friendly values.

The invention discloses a low-temperature-resistant organic silicon elastic damping body and a preparation method thereof, and belongs to the field of synthesis of organic polymer materials. The invention relates to a high-efficiency photoinitiator, which is prepared from the following ingredients in parts by weight: 95 to 110 parts of fluorosiloxane-phenylsiloxane segmented copolymers, 25 to 35 parts of boric acid ester end-capped polyurethane prepolymers, 10 to 15 parts of neodymium-containing metal organic frameworks, 20 to 40 parts of azobenzene modified CNT / TiO2, 2 to 4 parts of photoinitiators 1173 and 2 to 3 parts of neodymium acetylacetonate. Ultralow-temperature adaptability, self-repairing and high-modulus coexistence and wide-temperature-range damping stability are achieved through fluorosilicone / phenyl block copolymer molecular design, a borate-neodymium coordination double-dynamic network, stress response filler and a light-heat gradient curing process. The low-temperature-resistant organic silicon elastic damping body prepared by the invention provides a new solution idea for an extreme environment damping material, and has a wide application prospect.

The invention discloses a high-strength moisture-proof gypsum board and a preparation method thereof, and relates to the technical field of gypsum board preparation. The high-strength moisture-proof gypsum board is prepared by dipping the surface paper in the composite dipping liquid and then pouring the surface paper and the gypsum core with the waterproof agent, the composite dipping liquid comprises the methoxy vinyl ether copolymer and the epoxy polyoxymethylene dimethyl ether, and the methoxy vinyl ether copolymer is 2, 3, 5-trimethyl-1, 3-pentanediol monoisobutyrate. According to the present invention, epoxy polyoxymethylene dimethyl ether is prepared by reacting 2, 4-dimethoxymethoxyphenylacetic acid with 2-hydroxyethyl vinyl ether, and the epoxy polyoxymethylene dimethyl ether is prepared by terminating polyoxymethylene dimethyl ether with allyl and then reacting with phthalimide hexperoxy acid, such that the waterproofness and the mechanical property of the gypsum board are improved; the waterproof agent is prepared by reacting hydrogen-containing silicone oil and fluorine-containing hyperbranched amide polyurea urethane, so that the moisture resistance and bonding strength of the gypsum board surface paper are enhanced, and additional mechanical support is provided for the gypsum board.

The invention relates to the technical field of drilling compositions, in particular to a composite plugging agent, a plugging composition and plugging cement paste for shale gas formation cracks. The composite plugging agent for shale gas stratum cracks is composed of a bridging material, a filling material and an end-capping material, the mass ratio of the bridging material to the filling material to the end-capping material is (1.2-1.4): 0.5: (0.1-0.3), the bridging material is organic fibers with the length of 3-5 mm, the filling material is composed of inert particles with the particle size of 35-280 [mu] m and micro-silicon with the particle size of 0.15-1 [mu] m, and the end-capping material is a mixture of silicon oxide and silicon oxide. The end-capping material is composed of organic fibers with the length of 8-9 mm and walnut shells with the particle size of 3-5 mm. Through compounding of different types of bridging materials, filling materials and end sealing materials and grading of fibers with different lengths and plugging particles with different particle sizes, the plugging agent can be matched with cement paste in complex cracks and large cracks (1-4 mm) of a stratum to form a stable and compact plugging layer, the compressive strength is high, effective retention is achieved, and the effect of plugging a complex leakage layer is achieved.

The invention relates to a high-temperature-resistant UV viscosity-reducing adhesive tape and a preparation method thereof, and belongs to the technical field of UV viscosity-reducing adhesive tapes. The high-temperature-resistant UV viscosity-reducing adhesive tape comprises a base material layer, an adhesive layer and a release layer which are sequentially arranged, wherein the adhesive layer is prepared from an adhesive; the adhesive is prepared from the following components in parts by weight: 100 parts of an acrylate polymer, 0.1 to 2 parts of a cross-linking agent, 1 to 3 parts of a photoinitiator, 0.2 to 0.8 part of an antioxidant and 35 to 100 parts of a first solvent; the acrylate polymer comprises the following components in parts by weight: 70-80 parts of a soft monomer, 20-30 parts of a hard monomer, 5-10 parts of a polyfunctional monomer, 0.1-1 part of an initiator, 0.05-0.2 part of a polymerization inhibitor, 1-7 parts of an end-capping reagent and 100-200 parts of a second solvent. The UV viscosity-reducing adhesive tape can still keep excellent viscosity-reducing performance after being subjected to high-temperature treatment, and the effect that the viscosity is not reduced or even improved after being subjected to high-temperature treatment can be achieved.

The invention discloses two-component addition type low-density liquid foaming silicone rubber and a preparation method thereof, and belongs to the technical field of silicone rubber preparation. Comprising a component A and a component B, the component A is prepared from the following components in parts by weight: 50 to 70 parts of vinyl terminated polysiloxane, 10 to 20 parts of vinyl hydroxyl silicone oil, 0.5 to 2 parts of platinum catalyst, 15 to 25 parts of HGM (at) PN-rGO / APP and 3 to 8 parts of methyl vinyl MQ resin; the component B is prepared from the following components in parts by weight: 50 to 60 parts of vinyl-terminated polysiloxane, 8 to 15 parts of hydrogen-terminated hydrogen-containing silicone oil, 10 to 20 parts of methyl-terminated hydrogen-containing silicone oil, 5 to 10 parts of hydroxyl-terminated silicone oil, 0.002 to 0.01 part of an inhibitor, 10 to 20 parts of fumed silica and 1 to 3 parts of a tackifier. The synergistic components in the HGM-coated PN-rGO / APP can greatly improve the flame retardant property of the silicone rubber, improve the compression strength and reduce the heat release rate at the same time.

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 provides a porous bio-based polymer microsphere as well as a preparation method and application thereof. The porous bio-based polymer microsphere provided by the invention comprises a mixture of a bio-based high-molecular polymer P1 and a bio-based block copolymer P2, wherein the bio-based block copolymer P2 is a bio-based block copolymer of which the end-capped group at one end is a hydrophilic group and the end-capped group at the other end is a hydrophobic group. The porous microspheres are prepared by adopting a method of combining condensation phase separation, solvent replacement and solvent volatilization, the obtained microspheres are uniform and stable, the pelletizing rate of the microspheres is nearly high, the yield is high, and subsequent screening is not needed; the process is simple, and the difficulty in operation and control of the process caused by introduction of multiple water phases / oil phases is reduced.

The invention provides a silicone rubber material for a composite insulator and a preparation method thereof.The silicone rubber material is prepared from, by mass, 100 parts of vinyl-terminated polydimethylsiloxane, 12-16 parts of hydrophobic modified white carbon black, 3-5 parts of borate modified white carbon black, 5-7 parts of hydroxyl-terminated polydimethylsiloxane, 8-12 parts of polymethylhydrosiloxane and 0.001-0.005 part of a platinum catalyst, and 0.1-1 part of a light stabilizer. Through the synergistic effect of boric acid ester modified white carbon black and hydroxyl-terminated polydimethylsiloxane introduced into a silicone rubber system, an organic-inorganic composite interface structure with a reversible bonding characteristic can be constructed in the material, so that a polydimethylsiloxane chain segment can realize slow-release migration and dynamic compensation in a complex service environment; therefore, the hydrophobicity retentivity and the surface self-recovery capability of the composite insulator silicone rubber are remarkably improved.

The invention discloses a halogen-free low-volatility anti-icing photo-thermal super-hydrophobic coating for the surface of a wind power blade and a preparation method thereof. The coating is prepared by compounding functionalized modified multi-walled carbon nanotubes, functionalized modified nano titanium nitride, polydimethylsiloxane / nano silicon dioxide modified epoxy resin and a curing agent. Wherein the multi-walled carbon nanotubes are subjected to amidation and dual functionalization of lauric acid and 3-aminopropyl triethoxy silane; the surface of the nano titanium nitride is uniformly modified through bionic polydopamine coating; hydroxyl-terminated polydimethylsiloxane and nano SiO are doped into an epoxy resin base material, so that the system is endowed with low surface energy and high weather-resistant binding force. After curing and film forming at room temperature for 24 hours or at 80 DEG C for 2 hours, the water contact angle is greater than or equal to 155 DEG C, the ice adhesion strength is less than or equal to 10 kPa, the photo-thermal temperature is greater than or equal to 40 DEG C, and the performance is not attenuated after 50 times of heating and cooling tests; and after 150-hour damp heat, 500-hour ultraviolet radiation, acid corrosion and abrasive paper friction, the coating does not blister or fall off. The coating disclosed by the invention is green and environment-friendly, low in curing energy consumption, high in photo-thermal temperature rise and strong in super-hydrophobic durability, and can be used for remarkably improving the long-term anti-icing capability of wind power blades in cold and high-humidity regions.

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

The invention relates to a heat-conducting insulating cable material and a preparation method thereof, and belongs to the technical field of cable materials, the heat-conducting insulating cable material comprises the following raw materials: 50-60 parts of polypropylene, 25-30 parts of SEBS, 12-18 parts of a modified heat-conducting insulating material, 2-4 parts of a plasticizer, 6-8 parts of an antioxidant, 3-4 parts of a lubricant and 7-10 parts of a reinforcing filler; according to the technical scheme, modified hydroxylated boron nitride is combined with organic intercalated montmorillonite, then a silane coupling agent is grafted, and a silanization reinforced material is obtained; combining the silanization reinforcing material with a branched functional monomer to obtain an amino-terminated hyperbranched composite material; combining the amino-terminated hyperbranched composite material with an interface modifier to obtain a modified heat-conducting insulating material; mixing polypropylene, SEBS, the modified heat-conducting insulating material, a plasticizer, an antioxidant, a lubricant and a reinforcing filler, and performing extrusion granulation to obtain the heat-conducting insulating cable material. The mechanical property, the heat-conducting property and the insulating property of the cable material are improved.

The invention discloses a high-strength and high-toughness lignin-based liquid crystal elastomer as well as a preparation method and application thereof. A liquid crystal unit is subjected to hydroxyl end-capping modification and then reacts with a high-activity chain extender isocyanate to prepare a liquid crystal-polyurethane prepolymer, and finally the liquid crystal-polyurethane prepolymer is crosslinked with low-molecular-weight lignin, so that the lignin-based liquid crystal elastomer is prepared through a one-pot two-step method. According to the invention, a preparation system of a conventional liquid crystal elastomer by utilizing Michael addition polymerization is changed, a natural microphase separation structure and a strong intermolecular interaction force of polyurethane are utilized, and meanwhile, lignin with good compatibility with a liquid crystal unit is introduced as a covalent cross-linking agent, so that the mechanical properties of the liquid crystal elastomer are greatly improved. The prepared lignin-based liquid crystal elastomer is high in strength and toughness, can be repeatedly processed and utilized, has an ultraviolet aging resistance function and a shape memory function, and overcomes the problem that a traditional liquid crystal elastomer is poor in mechanical property.

The application discloses a method for preparing a low-viscosity vinyl fluorine-containing hyperbranched silicone resin and belongs to the technical field of organic polymer materials. The low-viscosity vinyl fluorine-containing hyperbranched silicone resin is prepared from a vinyl-containing siloxane monomer, an alkyl-containing siloxane monomer and a fluorine-containing siloxane monomer as raw materials through hydrolysis nucleation, condensation growth, end capping and purification treatment, wherein the vinyl content is not less than 3 wt%, the fluorine content is not less than 15 wt% and the viscosity is not higher than 1000 mPa.s. The vinyl fluorine-containing hyperbranched silicone resin has excellent properties of both a vinyl silicone resin and a fluorine-containing polymer, the existence of the vinyl group can be suitable for various reaction conditions, the existence of the fluorine-containing group makes the hydrophobic and oleophobic properties excellent, and the friction coefficient of the fluorine-containing polymer material is small, so that the vinyl fluorine-containing hyperbranched silicone resin has great application potential in the fields of oil-resistant sealing, anticorrosion coating, electronic materials, medical devices and the like.

The invention discloses a phenolphthalein-based polyaryletherketone polymer and a preparation method thereof, and the phenolphthalein-based polyaryletherketone polymer is prepared from the following raw materials: 240 to 370 parts of phenolphthalein monomer, 45 to 150 parts of modified phenolphthalein, 140 to 220 parts of 2, 6-dichlorobenzonitrile and 3 to 12 parts of alkyl halide. The modified phenolphthalein is prepared from phenolphthalein and a modifier; the modifying agent is selected from at least one of 3-amino propyl trimethoxy silane, 3-amino propyl triethoxy silane, bis (aminopropyl) polydimethylsiloxane, and aminopropyl terminated polydimethylsiloxane. By introducing a siloxane side chain and a cyano side bond and using long-chain aliphatic hydrocarbon for end capping, the bonding capacity of the polymer and other materials is improved, and meanwhile, the high temperature resistance and toughness of the polymer are kept.

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 provides a single-component modified silane adhesive as well as a preparation method and application thereof. The adhesive is prepared by mixing the following components: silane modified polyether resin, silane modified polymer resin, a plasticizer, a composite light stabilizer, a filler, a rheological additive, a water removal agent, a coupling agent and a catalyst, the silane modified polyether resin is silane-terminated resin prepared by a hydrosilylation method; the silane-modified polymer resin is a silane-terminated polymer resin containing a urethane bond. The adhesive is excellent in comprehensive performance, the tensile strength of a body is larger than 3 MPa, the elongation at break is larger than 450%, the adhesive is high in adhesion universality to metal base materials, PET films, ceramics, glass, wood floors, PVC, PC, ABS, wood-plastic composite materials and paint faces, the base materials do not need to be specially treated, the damage form is cohesive failure, and the adhesive has good adhesion strength, tear resistance and excellent temperature resistance and is suitable for being applied to the field of wood products. After aging at 120 DEG C for one week, the tensile strength of the body is greater than 3 MPa, the elongation at break is greater than 430%, and the surface layer can be coated after curing.

The invention relates to the technical field of high polymer materials, in particular to an EVA / nano-zinc oxide anti-ultraviolet car cover and a preparation method thereof. The invention aims to solve the problem that the mechanical strength and the ultraviolet resistance of the existing car cover are difficult to consider at the same time. Ethylene-vinyl acetate resin is used as a matrix, a silane coupling agent and hydroxyethyl methylacrylate surface modified and grafted composite nano-zinc oxide, maleic anhydride grafted EVA and a polyurethane modifier are subjected to melt blending, a TMPTA cross-linking agent is added, and the vehicle cover film is prepared through extrusion casting and ultraviolet curing. Wherein the polyurethane modifier is obtained by reacting polycaprolactone polyol with isophorone diisocyanate and adopting hydroxyethyl methylacrylate and 2, 2 '-methylenebis (6-tert-butyl-4-methylphenol) for end capping. The uvioresistant car cover prepared by the invention has excellent tensile strength, elongation at break, uvioresistant performance and adhesive force at the same time.

The invention relates to the technical field of fluorosilicone materials, in particular to a glass fiber sleeve with an excellent voltage resistance function and a preparation method of the glass fiber sleeve. The glass fiber sleeve with the excellent voltage-resistant function comprises a glass fiber sleeve and a composite coating coated on the outer side of the glass fiber sleeve, the composite coating is obtained by thermocuring a coating material; the coating material is prepared from the following raw materials in parts by mass: 50 to 100 parts of fluorinated silicone rubber emulsion, 1 to 5 parts of bis (3-aminopropyl) terminated polydimethylsiloxane, 0.5 to 1.5 parts of furfuryl alcohol resin, 1 to 5 parts of epoxy resin, 1 to 5 parts of activated nano silicon dioxide, 1 to 3 parts of boron nitride nanowire, 1 to 2 parts of dopamine hydrochloride, 1 to 2 parts of dispersing agent and 10 to 30 parts of solvent. The invention can effectively ensure that the coating forms a compact cross-linked structure in the curing process, and can enhance the adhesive force of the coating, weaken the temperature difference between the surface and the interior, inhibit the heat accumulation effect and delay the degradation of the insulating property.

The invention belongs to the technical field of high-performance polymer materials, and relates to thermal-crosslinkable polyimide, polyimide foam and a preparation method and application thereof. Aiming at the problem that the foaming performance of the existing polyimide foaming material is poor due to the fact that the melt strength and the chain segment activity are difficult to balance, the invention provides a method for regulating and controlling the rheological property by controlling the number-average molecular weight (Mn = 15-45kDa) of a precursor and introducing a thermally-crosslinkable end-capping group. The precursor can form a parison with a specific elastic network structure through hot-pressing cross-linking, and then the polyimide foam which is high in foaming rate, uniform and fine in foam hole, low in density and excellent in heat resistance can be prepared through a two-step method of supercritical fluid saturation pressure relief and high-temperature secondary foaming. The method realizes predictable control from molecular parameters to foaming performance, is suitable for various thermoplastic polyimide systems, and has a wide application prospect in the fields of aerospace heat insulation and the like.

The invention relates to the technical field of composite materials, in particular to a polyaryletherketone-based shape memory composite material and a preparation method thereof. Comprising a terpolymer, shape memory polyurethane, a first heat-conducting filler and a second heat-conducting filler, 4, 4 '-difluorobenzophenone and hydroquinone are firstly pre-polymerized to obtain a PEEK prepolymer, the PEEK prepolymer is terminated by a hydroxyl olefine acid ester monomer to obtain a terminated copolymer, and then an acrylate monomer and the terminated copolymer are subjected to double-bond addition to obtain the terpolymer; the first heat-conducting filler is a one-dimensional nano heat-conducting filler; the second heat-conducting filler is a zero-dimensional and / or two-dimensional heat-conducting substance; the prepared composite material has the shape fixing rate of 85% or above and the shape recovery rate of 87% or above, the recovery time is shorter than 25 seconds, and the good shape memory performance is achieved.

The invention relates to a tin-free one-component moisture-curable composition, comprising at least one organic polymer containing reactive silane end groups, at least one latent curing catalyst comprising at least one latent amine and at least one latent carboxylic acid, preferably adhesion promoters, plasticizers, fillers and optionally additives. The one-component moisture curable composition can be formulated to show excellent properties for storage stability and curing speed and is free of tin-based catalysts.

The invention relates to polyether-ether-ketone resin with extremely narrow molecular weight distribution as well as a preparation method and application of the polyether-ether-ketone resin. The preparation method of the polyether-ether-ketone resin comprises the following steps: uniformly mixing 4, 4 '-difluorobenzophenone, a phenolic monomer, a salt-forming agent and a solvent in an inert atmosphere, carrying out gradient heating, and then carrying out end capping; the gradient heating comprises the following steps: in the initial stage, the heat preservation temperature is 140-210 DEG C, in the transition stage, the heat preservation temperature is 250-280 DEG C, and in the final stage, the heat preservation temperature is 300-320 DEG C. The prepared PEEK resin has very narrow molecular weight distribution, the chemical, heat-resistant stability, anti-fatigue performance and mechanical performance of the PEEK resin can be remarkably improved, and the high-performance and high-quality requirements of PEEK in the high-end manufacturing field such as aerospace, medical treatment, electronics and semiconductors are met.

Articles and thermoplastic polyurethane compositions are described that comprise a thermoplastic polyurethane. Illustrative articles include a film, a structured film, a polishing layer, a molded component, or fibers. The thermoplastic polyurethane comprises the reaction product of a) at least one diol, b) at least one diisocyanate; c) optionally a diol chain extender; and d) at least one hydroxy -functional imidazole compound. The hydroxy -functional imidazole compound functions as a catalyst. The reaction product may further comprise e) a mono-alcohol, and / or f) a reactive compound that comprises hindered amine groups, that end cap the polyurethane chains. Also described are hydroxy¬ functional imidazole compounds and methods of making a thermoplastic polyurethane article.

The invention provides an organic silicon pouring sealant for a new energy automobile heater and a preparation method thereof, the organic silicon pouring sealant comprises a component A and a component B, the mass ratio of the component A to the component B is 1: 0.9-1.1; the component A comprises the following components in percentage by mass: 35%-45% of double-end vinyl silicone oil; 3-5% of modified silicone oil; 10%-20% of spherical silica powder; 35-45% of aluminum hydroxide; 0.1%-0.3% of fumed silica; 1%-2% of a molecular sieve; 0.3%-0.5% of a platinum catalyst; 0.1%-0.3% of carbon black; wherein the modified silicone oil is vinyl alkoxy terminated silicone oil. According to the technical scheme provided by the invention, hydroxyl silicone oil is subjected to alkoxy and vinyl end-capping modification, so that the organic silicon pouring sealant can form good bonding sealing with an aluminum alloy matrix and an electronic component when being cured at normal temperature, does not have obvious smell, and is convenient to use.

The invention discloses a method for preparing a single-walled carbon nanotube, and belongs to the technical field of single-walled carbon nanotubes. When the single-walled carbon nanotube is prepared, the single-walled carbon nanotube is grown by using a chemical vapor deposition method; then, the grown single-walled carbon nanotubes are subjected to acid pickling, then, the carbon tubes are sorted and purified by adopting a polymer dispersant, and finally, the polymer dispersant is removed to obtain the single-walled carbon nanotubes; the polymer dispersant disclosed by the invention is obtained by reacting an aldehyde-terminated fluorenyl surfactant with diamino dipyridyl; wherein the aldehyde-terminated fluorenyl surfactant is obtained by polymerizing 9, 9-di-n-octylfluorene-2, 7-diboric acid di-pinacol ester and quaternary ammonium salt containing 2, 7-dibromofluorene, and then reacting with 5-formyl-2-thiopheneboronic acid pinacol ester for end capping; the prepared single-walled carbon nanotube is relatively high in purity and relatively high in finished product conversion rate.

The invention relates to the technical field of special cables, and discloses a high and low temperature resistant composite insulating layer cable and a preparation method thereof.The cable comprises a conductor core and a composite insulating layer wrapping the conductor core, and the composite insulating layer comprises a high temperature resistant heat conduction core layer and a low temperature resistant elastic layer; the high-temperature-resistant heat-conducting core layer is prepared from the following raw material: polyamide acid; hexagonal boron nitride; alpha-phase silicon carbide; the preparation method comprises the following steps: adding gamma-amino propyl triethoxy silane; nano barium titanate; the low-temperature-resistant elastic layer is prepared from the following raw materials: vinyl terminated polydimethylsiloxane; performing hydrophobic treatment on fumed silica; a Karstedt catalyst; a hydrogen-containing silicone oil crosslinking agent; the average particle size D50 of the 1-ethynyl-1-cyclohexanol and the alpha-phase silicon carbide is 0.5 to 2 mu m. According to the invention, by adopting a microwave selective heating and interlayer heat conduction mechanism, efficient and high-quality integrated curing of the composite insulating layer is realized.