145results about How to "High thermal decomposition temperature" patented technology

The invention discloses a modified maleimide prepolymer, a resin composition and application thereof, the modified maleimide prepolymer is an amine compound modified maleimide prepolymer and is generated by a prepolymerization reaction of maleimide resin and an amine compound, and the weight ratio of the maleimide resin to the amine compound is 100: (1-120); according to the invention, the maleimide resin is modified by a compound containing a special aliphatic ring and aromatic amine structure, and due to the existence of the aliphatic ring or olefin structure, the dielectric property, the water absorption rate and the like of bismaleimide can be reduced; the structure has an excellent thermal expansion coefficient and can meet the requirement of high-order packaging; according to the present invention, the product has characteristics of high temperature resistance, no volatile low molecular substance generation during the reaction process, stable molecular structure and high thermal decomposition temperature, can completely meet the multi-chip assembly manufacturing process requirements in the large-scale integrated circuit, and can obtain the cured product with characteristics of high heat resistance, high toughness, low CTE, low dielectric property and low water absorption rate, and the obtained cured product has characteristics of high heat resistance, high toughness, low CTE, low dielectric property and low water absorption.

The invention relates to the technical field of acrylic resin, and discloses green, environment-friendly and high-temperature-resistant acrylic resin for printing ink and a preparation method of the acrylic resin. The acrylic resin for the green, environment-friendly and high-temperature-resistant ink is prepared from the following components in parts by weight: 100 parts of vinyl monomer, 3 to 8 parts of triazinyl styrene monomer, 0.7 to 0.8 part of initiator and 0.5 to 3 parts of zinc salt, a styrene hard monomer structure and a triazine ring are introduced into an acrylic resin molecular chain, so that the pencil hardness, the mechanical property and the high temperature resistance of a paint film are improved. The triazinyl styrene monomer contains an o-hydroxyl Schiff base triazine structure, and has a strong coordination chelation effect with zinc ions, so that the zinc ions can be adsorbed in an acrylic resin molecular chain and are not easy to wash and remove, and a paint film is endowed with excellent antibacterial performance. The obtained acrylic resin has good practical application in the aspect of high-temperature-resistant and antibacterial ink.

The invention relates to the field of material science, and discloses a preparation process of a softwood rubber metal composite material, which comprises the following steps: S1, cleaning the surfaces of metal, softwood and rubber; s2, plasma treatment is conducted on the surfaces of the metal, the cork and the rubber; s3, preparing a modified chemical coupling agent, and coating the modified chemical coupling agent on the surfaces of metal, cork and rubber; s4, hot press molding is carried out, and metal, rubber and cork are stacked and subjected to hot press treatment; and S5, cooling treatment is conducted, and the cork rubber metal composite material is obtained. The modified chemical coupling agent is prepared from the following components in percentage by weight: 70 to 80 percent of 3-methyl propyl triethoxy silane; 10 to 20 weight percent of diisocyanate-based silicone oil; 5 to 10 wt% of polyethylene glycol; and 2-5 wt% of dimethyl diallyl ammonium chloride. The interface bonding strength of the softwood rubber metal composite material is remarkably improved, and the overall mechanical performance is enhanced.

The invention relates to a polyether type high-flame-retardant halogen-free TPU material and a preparation method thereof, and belongs to the technical field of high polymer materials. Boron-containing polyethylene glycol and phosphorus-containing isocyanate are selected as synthetic raw materials of the polyether type TPU material, carboxylated silicon dioxide and aminated graphene are introduced at the same time, all the components have a synergistic effect, the tensile strength of the polyether type TPU material is effectively improved, and meanwhile the polyether type TPU material is endowed with good heat resistance and flame retardance.

The invention belongs to the field of high-molecular compounds, and provides polyester polyol for an adhesive as well as a preparation method and application of the polyester polyol. According to the preparation method, firstly, aliphatic dibasic acid is chemically modified through maleic anhydride, ester bonds with high polarity are generated, more reaction sites are introduced into the structure, and the crosslinking density is improved, so that stable cohesiveness can be kept in a high-temperature environment. The citric acid and the epoxidized soybean oil are added in the formula, and the citric acid is introduced as polybasic acid, so that the cross-linking reaction capacity of the material is enhanced, a more compact polymer network is formed, and the heat resistance and chemical stability of the adhesive are improved; by adding epoxidized soybean oil, the material is endowed with better flexibility, and meanwhile, epoxy groups can react with other components to form additional chemical crosslinking, so that the strength and durability of the material are further enhanced, and a synergistic effect is formed between the epoxy groups and maleic anhydride modified aliphatic dibasic acid; the excellent performance of the material can still be kept in a high-temperature environment.

The invention relates to the technical field of PE wrapping films, in particular to a multi-layer co-extrusion PE stretching wrapping film which overcomes the defects in the prior art and comprises the following components: polyethylene, polyhedral oligomeric silsesquioxane, ethylene-vinyl acetate, bonding resin, polypropylene, nano zirconium oxide particles, polyether-ether-ketone, an antistatic agent, a slip agent and an ultraviolet absorbent. According to the invention, novel nano materials such as nano zirconium oxide and polyhedral oligomeric silsesquioxane are introduced, and a material formula and a preparation process are optimized, so that the multi-layer co-extrusion PE stretching and wrapping film with higher wear resistance, high temperature resistance, chemical resistance and mechanical strength is developed, and increasingly complicated and diversified market requirements are met.

The invention relates to heteroaromatic super absorbent resin and a preparation method thereof, and belongs to the technical field of polymer synthesis. The invention provides heteroaromatic super absorbent resin. The structural formula of the heteroaromatic super absorbent resin is shown as a formula I, the heteroaromatic ring super absorbent resin does not contain a methine structure, contains more heteroaromatic ring structures, and is good in thermal stability. # imgabs0 #

The invention relates to the technical field of epoxy resin, and discloses polysiloxane functionalized aluminum nitride modified epoxy resin, which is characterized in that carboxyl-containing polysiloxane functionalized aluminum nitride is used as a functionalized filler to fill and modify the epoxy resin, methyl tetrahydrophthalic anhydride is used as a curing agent, imidazole is used as an accelerant, and in the thermocuring process, the carboxyl-containing polysiloxane functionalized aluminum nitride modified epoxy resin is prepared. Carboxyl in a polysiloxane molecular chain grafted on the surface of the nano aluminum nitride reacts with an imidazole accelerant to generate imidazole carboxylate, an imidazole-carboxylic acid curing system is formed, the curing process of the epoxy resin can be accelerated, the nano aluminum nitride is uniformly dispersed in an epoxy resin matrix after being modified by the functionalized polysiloxane, the dispersity is good, and the curing effect is good. The heat conductivity coefficient and the thermal decomposition temperature of the epoxy resin are greatly improved, and the heat-conducting property and the heat-resisting property of the epoxy resin are enhanced.

The present invention provides an organic compound, a mixture, a composition, a light extraction layer material and an organic electronic device. The structure of the organic compound is shown in the general formula (1), and the organic compound can be used as a light extraction layer material in an organic electroluminescent device to improve the light extraction efficiency of the device.

The invention relates to the technical field of printing ink, and discloses a preparation method of a water-borne epoxy resin binder and application of the water-borne epoxy resin binder in printing ink, water and nano titanium dioxide are added into a container, modified silicone oil is added after ultrasonic treatment, stirring and dispersing are carried out, then water-borne epoxy resin, a defoaming agent, a flatting agent and a thickening agent are added, stirring and uniform mixing are carried out, and the water-borne epoxy resin binder is obtained. The waterborne epoxy resin binder is obtained. The catechol structure of the modified silicone oil can be coordinated with the surface of the nano titanium dioxide, so that the surface coating modification of the nano titanium dioxide is realized, the agglomeration of the nano titanium dioxide is reduced, the dispersity of the nano titanium dioxide in a water-borne epoxy resin connecting material is improved, and the emulsion is free of precipitation and layering and very good in storage stability. The imino group contained in the modified silicone oil can be subjected to a curing reaction with the epoxy resin, so that a very good toughening effect is achieved, and meanwhile, the heat resistance and flame retardance of the epoxy resin are improved.

The invention belongs to the technical field of polyurethane, and is particularly a method for preparing a water-resistant antibacterial polyurethane material. The polyurethane resin and a quaternary ammonium salt phthalazinone hyperbranched polymer are mixed, left to stand for degassing, cast, and thermally cured to obtain the water-resistant antibacterial polyurethane material. The hyperbranched polymer contains a three-dimensional branched molecular chain, which forms a physical chain entanglement effect with the polyurethane molecular chain, has a good toughening effect on the polyurethane material, and is beneficial to improving the tensile strength and elongation at break of the material. The hyperbranched polymer contains a carbamate group, which can form a hydrogen bond force with the carbamate group of the polyurethane, thereby improving the interfacial bonding force between the two. After washing, the hyperbranched polymer is difficult to migrate out of the polyurethane material matrix, does not affect the fracture performance of the polyurethane material, and gives the polyurethane material excellent antibacterial performance and heat resistance.

The invention relates to the technical field of new materials, and discloses a functionalized carbon fiber in-situ polymerization modified polyurethane elastomer, which takes ethanolamine phosphate modified carbon fiber as a growth site and hydroxyl of phosphate as a polymerization site, so that polycarbonate dihydric alcohol and 4, 4 '-dihydroxy-4, 4'-dihydroxy-4, 4 '-dihydroxy-4, 4'-dihydroxy-4, 4 '-dihydroxy-4, 4'-dihydroxy-4, 4 In-situ graft polymerization is carried out on 4, 4 '-diphenylmethane diisocyanate on the surface of the carbon fiber to obtain the functionalized carbon fiber in-situ polymerization modified polyurethane elastomer, three-dimensional chemical crosslinking sites are formed in the carbon fiber and the polyurethane elastomer, movement of a polyurethane molecular chain is hindered, the glass transition temperature and the thermal decomposition temperature of the polyurethane elastomer are increased, and the mechanical properties of the polyurethane elastomer are improved. And phosphate ester micromolecules modified on the surface of the carbon fiber are used as a phosphorus-containing flame retardant, can be decomposed to generate a phosphoric acid derivative during combustion, can capture combustion chain reaction free radicals and absorb water to promote carbonization, and the polyurethane elastomer has excellent flame retardance.

The application relates to the technical field of AOC connector, and discloses a high-toughness bending-resistant AOC connector and a preparation method.The AOC connector comprises an optical cable assembly and an AOC connector head; the optical cable assembly comprises an optical fiber, an aramid yarn layer, a polyethylene outer protective layer and a braided layer; polyethylene, 4-hydroxystyrene grafted polyethylene, 1,3,5-tri(4-benzoxazinylphenyl)benzene and the like are mixed, extruded, granulated and heat-treated to obtain the polyethylene outer protective layer; the 1,3,5-tri(4-benzoxazinylphenyl)benzene contains multiple oxazine ring crosslinking polymerization sites, and crosslinking reaction occurs with the phenolic hydroxyl structure of the grafted polyethylene, the crosslinking degree of the molecular chains in the polyethylene is increased, the polyethylene molecular chains are not prone to relative slipping under external force, the ability to resist external force deformation is increased, the polyethylene outer protective layer has good strength and high-toughness bending resistance, and the bending resistance and protection performance of the AOC connector optical cable are improved.

This invention discloses a modification method for nanocrystalline magnetic core encapsulation materials. The method includes: S1: surface functionalization modification of nano-silica and boron nitride nanosheets by grafting amino and epoxy groups, respectively; S2: blending and dispersing the modified inorganic nanofiller with low-viscosity bisphenol A type epoxy resin, flexible epoxy resin diluent, latent curing agent, and coupling agent under high shear force to form a uniform and stable modified epoxy resin composition; S3: plasma cleaning and activation treatment of the nanocrystalline magnetic core; S4: encapsulating the modified epoxy resin composition on the surface of the magnetic core using a vacuum pressure impregnation process, followed by programmed temperature curing. This invention significantly improves the mechanical strength, thermal conductivity, and heat resistance of the encapsulation layer and reduces the high-frequency dielectric constant and loss by constructing an organic-inorganic interpenetrating network and interface reinforcement.

The invention relates to a high-hardness polyurethane adhesive as well as a preparation process and application thereof, and belongs to the technical field of polyurethane materials. The high-hardness polyurethane adhesive comprises a component A and a component B. The component A comprises the following raw materials in parts by weight: 30-50 parts of polyether polyol, 10-20 parts of a cross-linking agent, 5-10 parts of a composite filler, 0.5-1 part of a catalyst and 0.5-1 part of an antioxidant; and the component B is polyisocyanate. The adhesive prepared by the invention has high hardness and good toughness.

The present invention discloses a polymer, a preparation method thereof and an application as a foam material. The structure of the polymer is shown in Formula I. The diamine monomer of the present invention is synthesized by a three-step method, the preparation route is simple, the product configuration is unique, the yield is high, and the synthesis method has universal applicability. The polyimide foam of the present invention is used as a high-temperature resistant material, and its glass transition temperature reaches 355°C, and the thermal decomposition 5% temperature reaches 520°C, which has good application prospects in high-temperature environments.

The invention belongs to the technical field of polyester fibers and discloses a method for preparing a high-strength polyester fiber containing a liquid crystal polymer. 1,3-bis(3-(biphenyl propyl)-1,1,3,3-tetramethyldisiloxane, a diol compound and a diisocyanate compound are reacted to obtain a polyester-polyurethane-based liquid crystal polymer. The polyester-polyurethane-based liquid crystal polymer is then melt-blended with polyethylene terephthalate, extruded, granulated and melt-spun to obtain a high-strength polyester fiber containing the liquid crystal polymer. The polyester-polyurethane-based liquid crystal polymer contains a benzoate structure, has good structural similarity with polyethylene terephthalate, improves the compatibility and dispersibility of the polyester-polyurethane-based liquid crystal polymer in the polyester fiber, and contains a flexible and heat-resistant organic siloxane structure and a thermally stable biphenyl group, which can significantly improve the tensile properties and heat resistance of the fiber.

The application discloses a kind of high-performance outdoor full package imitation wood composite board and preparation method thereof, relate to polyurethane composite board technical field, the full package imitation wood composite board includes base board, and the polyurethane material of setting in the lower surface and the four around of base board, and the resin material of setting in upper surface.Its preparation method includes the following steps: pouring polyurethane material in the silica gel mould after surface treatment, place base board, mould pressing, make the polyurethane material with wood texture around and lower surface of base board composite, obtain intermediate product A;Resin material is rolled on the upper surface of intermediate product A, and is dried, to obtain full package imitation wood composite board;The silica gel mould after surface treatment is prepared by transferring real solid wood board texture.

The invention relates to the technical field of battery current collectors, and discloses a high-performance composite current collector, which comprises a base film and a metal layer on at least one side of the base film, the base film is prepared from the following raw material components in parts by weight: 65 to 95 parts of PET (Polyethylene Terephthalate), 2 to 25 parts of PET grafted polyaniline, 0.2 to 5 parts of graphene oxide, 0.1 to 5 parts of a coupling agent, 1 to 5 parts of maleic anhydride grafted PET and 1 to 5 parts of imide modified PET. By adopting the composite current collector provided by the invention, the balance, the thermal decomposition temperature and the flame-retardant capability of the current collector can be improved.

The invention discloses plant fiber composite rubber and a preparation method thereof.The plant fiber composite rubber comprises a rubber matrix and plant fiber filler, the rubber matrix is composed of natural rubber and butadiene styrene rubber, the plant fiber filler is composed of linen fibers and bamboo fibers, and the plant fiber composite rubber comprises, by weight, 70-100 parts of natural rubber, 20-30 parts of linen fibers, 20-30 parts of bamboo fibers and 20-30 parts of linen fibers. The invention relates to the technical field of composite rubber preparation, and relates to the technical field of composite rubber preparation. The composite rubber is prepared from, by weight, 30-50 parts of styrene butadiene rubber, 10-15 parts of linen fiber, 5-10 parts of bamboo fiber, 58-76 parts of reinforcing filler, 2.5-5 parts of sulfur, 1.5-3 parts of accelerant CBS and 20-39 parts of additive. The linen fibers and the bamboo fibers have high strength and toughness, and the chopped glass fibers have high strength and modulus, are uniformly dispersed in the rubber and interact with a rubber matrix, so that the tensile strength and the tear strength of the rubber are improved, and the rubber can bear larger external force without being damaged.

The present invention relates to the technical field of acrylic resins, and discloses an acrylic resin for green, environmentally friendly, high temperature resistant ink and a preparation method thereof. The green, environmentally friendly, high temperature resistant ink acrylic resin comprises 100 parts by weight of vinyl monomer, 3-8 parts by weight of triazine-based styrene monomer, 0.7-0.8 parts by weight of initiator, and 0.5-3 parts by weight of zinc salt; the present invention introduces a styrene hard monomer structure and a triazine ring into the acrylic resin molecular chain, which is beneficial to improving the pencil hardness, mechanical properties and high temperature resistance of the paint film. The triazine-based styrene monomer contains an o-hydroxy Schiff base triazine structure, which has a strong coordination chelation effect with zinc ions, and can adsorb zinc ions in the acrylic resin molecular chain, which is not easy to wash and remove, and gives the paint film excellent antibacterial properties. The obtained acrylic resin has good practical applications in high temperature resistance and antibacterial inks.

The application belongs to the field of high polymer materials, and particularly discloses a modified basic magnesium carbonate and a PA12 composite material and a preparation method thereof.The preparation method of the modified basic magnesium carbonate comprises the following steps: adding sodium carbonate and magnesium chloride into a sodium hydroxide solution to perform a water bath reaction to obtain the basic magnesium carbonate; adding the basic magnesium carbonate and acrylic acid into deionized water to perform a water bath reaction to obtain acrylic acid modified basic magnesium carbonate; and adding the acrylic acid modified basic magnesium carbonate, glycidyl methacrylate and an initiator into an organic solvent aqueous solution to perform a water bath reaction to obtain the modified basic magnesium carbonate.The modified basic magnesium carbonate prepared by the application can decompose and absorb heat at high temperature, release water vapor and carbon dioxide and other non-combustible gases, dilute the oxygen concentration on the surface of the combustion object, and reduce the temperature of the combustion area, so as to play a role in flame retardation.In addition, the magnesium oxide produced by decomposition covers the surface of the material to form a protective layer, and further prevents the combustion.

The invention discloses an organic near-infrared photothermal conversion material as well as a preparation method and application thereof, and belongs to the technical field of photothermal materials, the organic near-infrared photothermal conversion material is prepared through Suzuki coupling reaction and / or Sonogashira coupling reaction, 6-(2-ethylhexyl)-[1, 2, 5] thiadiazole [3, 4-F] benzotriazole or benzobisthiadiazole is used as an acceptor core, and the organic near-infrared photothermal conversion material is prepared through a one-step reaction. The same or different donor units are connected through a triple-bond pi bridge. The synthesis method of the organic near-infrared photothermal conversion material is simple, the molecular conjugated structure is prolonged and the intermolecular interaction is enhanced by introducing a triple bond pi bridge, and the organic near-infrared photothermal conversion material has longer-wavelength sunlight absorption capacity and excellent photothermal conversion capacity, can reach a high temperature of 300 DEG C or above under the action of laser and condensed sunlight, and has a wide application prospect. The method has a wide application prospect in the fields of photo-thermal device preparation, laser ignition, laser metal processing and the like.

The application provides a kind of energetic complex K-BTE and its continuous preparation method and application, by taking 1,2-di (tetrazole-5-yl) ethane as starting material, ligand solution and metal ion salt solution are continuously injected into continuous flow reaction unit by injection pump respectively, by filtering, washing, drying, obtain energetic complex crystal, develop a kind of simple continuous process, mild reaction conditions new energetic complex preparation method, and first of all, a kind of novel structure, excellent comprehensive performance energetic complex K-BTE is prepared, in addition to the characteristics of high thermal stability, energetic complex K-BTE also has the advantages of simple and efficient process method, process safety controllable, the thermal decomposition temperature of K-BTE is as high as 366.5 DEG C, the actual measured impact sensitivity is greater than 40J, the friction sensitivity is between 240N-360N, while having catalytic effect on thermal decomposition of ammonium perchlorate.The excellent performance of K-BTE makes it have great application potential as an energetic complex in the field of catalytic solid propellant combustion efficiency.

The present invention provides a flame retardant material containing bauxite and a preparation method thereof, and relates to the technical field of flame retardant materials. The flame retardant material containing bauxite of the present invention is prepared from the following raw materials in parts by weight: 25-30 parts of epoxy resin, 8-10 parts of modified sepiolite, 12-16 parts of bauxite, 12-16 parts of attapulgite-nano silicon carbide composite, 6-8 parts of curing agent, 0.5-1 parts of dispersant, 10-12 parts of hexaphenoxy cyclotriphosphazene, 6-10 parts of ammonium polyphosphate, 5-7 parts of starch, 3-5 parts of melamine, and 20-25 parts of water. The flame retardant material containing bauxite of the present invention improves the flame retardant performance, high temperature resistance and adhesion ability of the material by optimizing its composition and ratio, which is helpful to promote the technological progress and industrial upgrading of the fireproof material industry, and provides strong support for protecting the safety of life and property.

This invention relates to the field of new energy vehicle battery pack accessories technology, and discloses an ICCS integrated busbar mechanism and its processing technology. The mechanism includes an FPCA module, an aluminum busbar, an insulating bracket, and series aluminum busbars. The FPCA module is mounted on the insulating bracket to form an independent module. Its flexible circuit board uses a modified fluorinated polyimide insulating substrate, which is polymerized from 2,2'-bis(trifluoromethyl)biphenyl-4,4'-diamine and pyromellitic dianhydride in a specific ratio. The aluminum busbar is soldered to the acquisition pad of the FPCA module, and the series aluminum busbars are connected to the aluminum busbars of each module. The processing technology includes hot-pressing copper-clad board fabrication, reflow soldering, ultrasonic welding of the aluminum busbar, and laser welding of the aluminum busbars. This invention improves the high-temperature resistance and low dielectric properties of the insulating substrate, ensuring the electrical reliability of the busbar mechanism for high-current transmission and signal acquisition under complex operating conditions.

The invention relates to the technical field of curing adhesives, in particular to a fast-curing specimen sealing adhesive and a preparation method thereof. The rapidly-cured specimen sealing adhesive is prepared by mixing the following raw materials: mixed phenol epoxy vinyl resin, triethylene glycol dimethacrylate and a photoinitiator, wherein the mixed phenol epoxy vinyl resin is obtained by reacting bisphenol F, 4, 4 '-dihydroxybiphenyl, 4, 4, 4-trihydroxy trimethylbenzene and epoxy chloropropane, cyclizing with sodium hydroxide and esterifying with acrylic acid. The fast-curing specimen sealant provided by the invention has a fast curing effect, has high hardness and excellent adhesive force after being cured, has outstanding heat resistance, effectively prevents release of xylene, gains precious life time for patients, and shortens operation time for medical workers.

The invention relates to the technical field of PQQ, in particular to a pyrroloquinoline quinine disodium salt crystal form and a preparation method thereof.The pyrroloquinoline quinine disodium salt crystal form has characteristic diffraction peaks when the diffraction angles 2 theta are 9.3 + / -0.2, 11.8 + / -0.2, 12.7 + / -0.2, 13.6 + / -0.2, 15.1 + / -0.2, 16.1 + / -0.2, 26.5 + / -0.2, 27.5 + / -0.2, 28.5 + / -0.2 and 38.1 + / -0.2 through X-ray powder diffraction analysis measured by Cu-K alpha rays, and the crystal form can be used for preparing the pyrroloquinoline quinine disodium salt crystal form. By optimizing crystallization process conditions, the pyrroloquinoline quinone disodium salt crystal form with higher thermal decomposition temperature and lower glass transition temperature is provided, and the actual application requirements are better met.

This invention discloses a high-temperature resistant modified starch filtration reducer and its preparation method, belonging to the field of petroleum drilling fluid technology. The raw material composition of the modified starch filtration reducer includes starch, a crosslinking agent, alkenylamide monomers, alkenyl sulfonic acid monomers, bicyclic olefin anhydrides, an initiator, and a solvent. This invention constructs a three-dimensional network framework of starch through crosslinking pretreatment, then introduces a rigid structure of bicyclic olefin anhydrides, and grafts and copolymerizes it with functional monomers such as alkenylamides and alkenyl sulfonic acids to obtain a modified starch filtration reducer with a dual crosslinked network structure. This product can withstand temperatures up to 200℃, possesses excellent salt and calcium resistance, has minimal impact on drilling fluid rheology, is biodegradable, and is suitable for challenging drilling operations such as deep and ultra-deep wells.

The invention discloses a high-temperature-resistant long-life ternary lithium ion battery, which belongs to the field of lithium ion batteries, comprises a lithium ion battery positive electrode system, a lithium ion battery negative electrode system and an electrolyte, and is characterized in that the lithium ion battery positive electrode system adopts a single-crystal medium nickel NCM material of which the surface is coated with a solid electrolyte; the electrolyte is a high-temperature-resistant electrolyte and comprises the following components in percentage by mass: 5-20% of a multi-lithium-salt system, 60-85% of a mixed solvent of a nitrile solvent and a carbonic ester solvent and 0.5-20% of a film-forming additive. And by carrying out surface coating modification on the single-crystal ternary material, the thermal decomposition temperature of the positive electrode material is effectively improved, and the high-temperature cycle performance of the lithium ion battery is further improved. And in the aspect of high-temperature electrolyte, the high-temperature cycle performance of the lithium ion battery is effectively improved through construction of a high-thermal-stability multi-lithium-salt system, construction of a flame-retardant organic solvent system and compounding of a film-forming additive. And the prepared high-temperature-resistant long-service-life ternary lithium ion battery has batch production capability and good performance consistency.