High-buffering and heat-insulating mica composite material for new energy vehicle battery and preparation method thereof

Abstract

The application relates to a mica composite material for automobile battery modules, in particular to a high-buffering and heat-insulating mica composite material for new energy vehicle batteries and a preparation method thereof. The high-buffering and heat-insulating mica composite material for new energy vehicle batteries comprises flexible mica paper and a buffering and heat-insulating material integrally formed on the surface of the flexible mica paper; the buffering and heat-insulating material is polyurethane foaming resin; the polyurethane foaming resin has good bonding force with the organic silicon resin contained in the flexible mica paper, or the flexible mica paper contains the organic silicon resin which has excellent bonding force with the polyurethane surface layer resin, or a primer layer is formed between the flexible mica paper and the buffering and heat-insulating material, and the primer layer has good bonding force with the flexible mica paper and the buffering and heat-insulating material. The heat-insulating layer and the flexible mica layer have good bonding stability, the overall fire-retardant and fireproof property of the application is ensured, and excellent buffering and heat-insulating effects are provided.

Description

Technical Field

[0001] This application relates to the field of mica composite materials for automotive battery modules, and in particular to a high-buffering, heat-insulating mica composite material for new energy vehicle batteries and its preparation method. Background Technology

[0002] Flexible mica paper is composited with foamed materials (such as foamed melamine, foamed polyurethane, foamed rubber, and foamed silicone) using commercially available adhesives (such as hot melt adhesives and acrylic adhesives) to bond the flexible mica paper and foamed materials, forming a flexible mica composite material. However, the heat resistance and aging resistance of the flexible mica composite material prepared in this way are relatively poor and cannot meet the requirements of lithium battery cell modules for new energy vehicles. Based on the existing technology, the flexible mica composite material that meets the requirements of lithium battery cell modules for new energy vehicles has extremely high requirements for the heat resistance and aging resistance of the adhesive. This results in a high cost of special adhesives that meet the requirements, leading to a high overall production cost of the flexible mica composite material and hindering the widespread adoption of flexible mica composite technology, limiting its application to a few high-end models.

[0003] Existing technologies employ special adhesives to produce composite foamed materials. This requires the foamed material to be prepared separately on release paper, and then the two are bonded together using a fabric lamination device to form a flexible mica composite material. This preparation process is relatively complex, further limiting the production cost of flexible mica composite materials. Furthermore, if the foamed material is directly laminated onto the flexible mica paper, the resulting flexible mica composite material exhibits extremely poor adhesion stability and peel strength. The laminated foamed material easily detaches when rubbed, rendering it unusable for industrial applications and failing to meet the requirements for use in automotive battery cells. Therefore, to address the problems of the existing technology, the applicant provides a high-buffering, heat-insulating mica composite material for new energy vehicle batteries and its preparation method. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a high-buffering, heat-insulating mica composite material for new energy vehicle batteries and its preparation method.

[0005] This application provides a high-buffering, heat-insulating mica composite material for new energy vehicle batteries, which is achieved through the following technical solution:

[0006] A high-buffering, heat-insulating mica composite material for new energy vehicle batteries includes flexible mica paper and a buffer and heat-insulating material integrally formed on the surface of the flexible mica paper; the buffer and heat-insulating material is polyurethane foam resin; the polyurethane foam resin has good bonding force with the organosilicon resin contained in the flexible mica paper, or the flexible mica paper contains organosilicon resin with excellent bonding force with the polyurethane surface layer resin, or a base coating is formed between the flexible mica paper and the buffer and heat-insulating material, and the base coating has good bonding force with both the flexible mica paper and the buffer and heat-insulating material.

[0007] In this application, the heat insulation layer and the flexible mica layer do not require the use of special functional adhesives for bonding. At the same time, the research on the formulation and process of the heat insulation layer material and / or flexible mica material can ensure that the heat insulation layer and the flexible mica layer can be integrally molded to obtain a flexible mica composite material without the need for adhesive application. When used between automotive battery cells, this application not only has flame-retardant and fire-resistant properties, but also has excellent buffering and heat insulation effects and good heat resistance and stability, which is conducive to improving the flame-retardant, fire-resistant, safety and stability of lithium battery cell modules.

[0008] Preferably, the polyurethane foam resin, which has good bonding force with the silicone resin contained in the flexible mica paper, contains anhydride-modified polyester polyol, dihydroxyvinyl silicone oil, and / or olefin with unsaturated bonds in its specific raw materials; the molar amount of the dihydroxyvinyl silicone oil is 3-8 wt% of the molar amount of isocyanate in the polyurethane foam resin.

[0009] Preferably, the polyurethane foaming resin is mainly composed of polyol, chain extender, dihydroxyvinyl silicone oil, isocyanate, catalyst, crosslinking agent, foaming agent, foam stabilizer, and functional additives; the polyol is composed of polyether glycol, anhydride-modified polyester polyol, and polycarbonate glycol; the chain extender is composed of at least one of 1,4-butenediol combined with 1,4-butanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, and 1,4-butanediamine; the isocyanate is MDI, IPDI, and 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H The product is composed of 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione, wherein the content of 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione accounts for 5-10 wt% of the total mass of the isocyanate; the foaming agent is water and / or HFC-245fa; the foam stabilizer is one of silicone oil surfactant B8716, silicone surfactant B4113, and silicone surfactant B-8110; the crosslinking agent is at least one of 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane, triglycidyl isocyanate, triethanolamine, and glycerol.

[0010] Preferably, the functional additives include flame retardants, anti-aging agents, and toughening agents; the flame retardant is at least one of aluminum hydroxide (800 mesh or finer), magnesium hydroxide, nano magnesium oxide, and nano silica powder; the anti-aging agent is at least one of antioxidant 1010, antioxidant 1098, and antioxidant 168; and the toughening agent is at least one of nano alumina powder, titanium nitride whiskers, and boron nitride nanosheets.

[0011] By adopting the above technical solution, it is possible to integrally form a flexible mica composite material between the heat insulation layer and the flexible mica layer without the need for adhesive application. This application not only has flame-retardant and fire-resistant properties when used between automotive battery cells, but also has excellent buffering and heat insulation effects and good heat resistance and stability, which is conducive to improving the flame-retardant, fire-resistant, safety and stability of lithium battery cell modules.

[0012] Preferably, the silicone resin with excellent adhesion to the buffer and heat insulation material is a two-component silicone resin; the first component of the two-component silicone resin includes a polyol, a chain extender, an isocyanate, an organic solvent, a catalyst, an additive, and a vinyl silicone oil, wherein the polyol is composed of polyether glycol, anhydride-modified polyester polyol, and polycarbonate glycol, and the vinyl content in the vinyl silicone oil is controlled at 0.06-20 wt%; the second component includes a hydrogen-containing silicone oil, wherein the hydrogen content of the hydrogen-containing silicone oil is 0.03%-1.60%; the molar ratio of the vinyl content in the first component to the molar ratio of the active hydrogen in the second component hydrogen-containing silicone oil is 1:(1.08-1.32).

[0013] Preferably, the preparation method of the two-component silicone resin is as follows: The prepared anhydride-modified polyester polyol is mixed with polyether glycol, polycarbonate glycol, chain extender, organic solvent, catalyst, and additives, then heated to 42-48℃ and mechanically stirred for 20-30 minutes. A portion of diisocyanate is added, and the temperature is adjusted to 74-78℃. The reaction is carried out for 1 hour, and the viscosity is tested. When the viscosity of the reactants reaches 5000~2.0×10⁻⁶... 4 At mPa•s / 25℃, the remaining diisocyanate is added, and the NCO content is adjusted to 0.8-6.4%. The reaction is then stopped to obtain the modified polyurethane resin. The obtained modified polyurethane resin is mixed with vinyl silicone oil at a mass ratio of (15-25):(75-85) to obtain the first component. The first component and the second component are mixed at a vinyl:active hydrogen molar ratio of 1:(1.08-1.32), and then a platinum catalyst is added. The mixture is then mixed evenly to obtain the finished two-component organosilicon resin.

[0014] Preferably, the molar ratio of vinyl groups in the first component to active hydrogen in the second component (hydrogen-containing silicone oil) is 1:(1.18-1.24); the NCO content of the first component is adjusted to 3.2-4.8% during preparation.

[0015] By adopting the above technical solution, it is possible to integrally form a flexible mica composite material between the heat insulation layer and the flexible mica layer without the need for adhesive application. This application not only has flame-retardant and fire-resistant properties when used between automotive battery cells, but also has excellent buffering and heat insulation effects and good heat resistance and stability, which is conducive to improving the flame-retardant, fire-resistant, safety and stability of lithium battery cell modules.

[0016] Preferably, the base coating is a silicone-modified polyurethane adhesive; the silicone-modified polyurethane adhesive contains anhydride-modified polyester polyol, dihydroxyvinyl silicone oil and / or olefin with unsaturated bonds; the molar amount of the dihydroxyvinyl silicone oil is 3-12 wt% of the molar amount of isocyanate in the polyurethane foaming resin; the manufacturing process of the high-buffering, heat-insulating mica composite material for new energy vehicle batteries is as follows: first, prepare silicone-modified polyurethane adhesive, then spray silicone-modified polyurethane adhesive onto the surface of flexible mica paper, heat to 74-78℃ to make the silicone-modified polyurethane adhesive into a gel state, add polyurethane foaming resin raw materials and perform molding foaming treatment to obtain the finished flexible mica composite material.

[0017] The use of a primer coating method to bond flexible mica paper and buffer insulation material in this application can reduce overall production and reduce production difficulty.

[0018] This application provides a method for preparing a high-buffering, heat-insulating mica composite material for new energy vehicle batteries, which is achieved through the following technical solution:

[0019] A method for preparing a high-buffering, heat-insulating mica composite material for new energy vehicle batteries includes the following steps: Step 1, preparation of the polyurethane foam resin that has good bonding force with the organosilicon resin contained in flexible mica paper;

[0020] Step 2: After cleaning the surface of the flexible mica paper, place it into the molding mold, and then add the polyurethane foam resin obtained in Step 1 into the molding mold. The finished flexible mica composite material is obtained by compression molding and foaming.

[0021] Alternatively, a method for preparing a high-buffering, heat-insulating mica composite material for new energy vehicle batteries includes the following steps: Step 1, preparation of a two-component organosilicon resin;

[0022] Step 2: The two-component silicone resin from Step 1 and the silicone resin for mica paper are mixed evenly at a mass ratio of (8-20):(80-92) to obtain a modified silicone resin. The modified silicone resin is then used to press and mold flexible mica paper with an ideal shape and a glue content of 10-16wt%.

[0023] Step 3: Add polyurethane foam resin into a molding mold containing flexible mica paper of the desired shape, and perform compression molding foaming to obtain the finished flexible mica composite material.

[0024] The preparation method provided in this application is relatively simple, easy to operate, and easy to realize industrial production.

[0025] In summary, this application has the following advantages:

[0026] 1. The present application has not only flame-retardant and fire-resistant properties between automotive battery cells, but also excellent buffering and heat insulation effects and heat resistance stability, which is conducive to improving the flame-retardant, fire-resistant, safety and stability of lithium battery cell modules.

[0027] 2. The preparation method provided in this application is relatively simple, easy to operate, and easy to realize industrial production. Detailed Implementation

[0028] To further understand the present invention, preferred embodiments are described below with reference to examples. However, it should be understood that these descriptions are merely for illustrating the features and advantages of the present invention and are not intended to limit the scope of the claims. Those skilled in the art can refer to the content of this document to appropriately modify the process parameters for implementation.

[0029] It is particularly important to note that all similar substitutions and modifications will be obvious to those skilled in the art and are considered to be included within the scope of this invention. The methods and applications of this invention have been described through preferred embodiments, and those skilled in the art will readily be able to modify or appropriately alter and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to implement and apply the technology of this invention. While it is believed that those skilled in the art will fully understand the following terms, the following definitions are set forth to help illustrate the subject matter disclosed in this invention.

[0030] As used herein, the term "comprising" is synonymous with "including," "containing," or "characterized in," and is inclusive of endpoints or open-ended, and does not exclude additional unstated elements or method steps. "Comprising" is a technical term used in the language of claims, meaning that the stated element is present, but other elements may be added and still form a construction or method within the scope of the claims. Example

[0031] A high-buffering, heat-insulating mica composite material for new energy vehicle batteries includes flexible mica paper and a buffer and heat-insulating material integrally formed on the surface of the flexible mica paper. The buffer and heat-insulating material is specifically polyurethane foam resin. The flexible mica paper is made of phlogopite powder and KR-242A silicone resin from Shin-Etsu Chemical Co., Ltd. of Japan, with the adhesive content controlled at 10-16% and the thickness controlled at 0.2-0.6 mm.

[0032] The polyurethane foam resin formed on the surface of flexible mica paper using an integrated molding process constitutes a high-buffering, heat-insulating mica composite material for new energy vehicle batteries. Specific methods include the following three approaches: ① The polyurethane foam resin and the KR-242A silicone resin contained in the flexible mica paper exhibit good bonding strength, thus ensuring the adhesion stability between the flexible mica paper and the buffer / heat insulation material. ② Alternatively, the flexible mica paper contains silicone resin with excellent bonding strength to the buffer / heat insulation material, thus ensuring the adhesion stability between the flexible mica paper and the buffer / heat insulation material. ③ Alternatively, a base coating is applied between the flexible mica paper and the buffer / heat insulation material to ensure the adhesion stability between them.

[0033] The polyurethane foam resin, which exhibits good bonding with the silicone resin contained in the flexible mica paper, specifically comprises anhydride-modified polyester polyol, dihydroxyvinyl silicone oil, and / or olefins with unsaturated bonds, wherein the molar amount of dihydroxyvinyl silicone oil is 3-8 wt% of the molar amount of isocyanate in the polyurethane foam resin. Preferably, the polyurethane foam resin is mainly composed of polyol, chain extender, dihydroxyvinyl silicone oil, isocyanate, catalyst, crosslinking agent, foaming agent, foam stabilizer, and functional additives. The polyol is composed of polyether glycol, anhydride-modified polyester polyol, and polycarbonate glycol. The chain extender is composed of at least one of 1,4-butenediol combined with 1,4-butanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, and 1,4-butanediamine. The isocyanate is composed of MDI, IPDI, and 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione, wherein the content of 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione accounts for 5-10 wt% of the total isocyanate mass to improve the overall heat resistance stability requirements. The blowing agent is water and / or HFC-245fa. The foam stabilizer is one of the following: silicone oil surfactant B8716, silicone surfactant B4113, and silicone surfactant B-8110. The crosslinking agent is at least one of 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane, triglycidyl isocyanate, triethanolamine, and glycerol. The functional additives include flame retardants, anti-aging agents, and toughening agents. The flame retardant is at least one of aluminum hydroxide (800 mesh or finer), magnesium hydroxide, nano-magnesium oxide, or nano-silica powder. The anti-aging agent is at least one of antioxidant 1010, antioxidant 1098, or antioxidant 168. The toughening agent is at least one of nano-alumina powder, titanium nitride whiskers, or boron nitride nanosheets.

[0034] The preparation method of high-buffering and heat-insulating mica composite material for new energy vehicle batteries includes the following steps:

[0035] Step 1: Preparation of polyurethane foam resin with good bonding force with the organosilicon resin contained in flexible mica paper.

[0036] Step 2: After cleaning the surface of the flexible mica paper, place it into the molding mold, and then add the polyurethane foam resin obtained in Step 1 into the molding mold. The finished flexible mica composite material is obtained by compression molding and foaming.

[0037] The silicone resin with excellent adhesion to cushioning and heat insulation materials is a two-component silicone resin. The first component of the two-component silicone resin includes a polyol, chain extender, isocyanate, organic solvent, catalyst, additives, and vinyl silicone oil. The polyol in the first component is composed of polyether glycol, anhydride-modified polyester polyol, and polycarbonate glycol, and the vinyl content in the vinyl silicone oil is controlled at 0.06-20 wt%. The second component includes hydrogen-containing silicone oil with a hydrogen content of 0.03%-1.60%. The molar ratio of vinyl content in the first component to the molar ratio of active hydrogen in the second component (hydrogen-containing silicone oil) is 1:(1.08-1.32).

[0038] A method for preparing a high-buffering, heat-insulating mica composite material for new energy vehicle batteries includes the following steps:

[0039] Step 1, Preparation of the two-component silicone resin: The prepared anhydride-modified polyester polyol is mixed with polyether glycol, polycarbonate glycol, chain extender, organic solvent, catalyst, and additives, and then heated to 42-48℃ and mechanically stirred for 20-30 minutes. A portion of diisocyanate is added, and the temperature is adjusted to 74-78℃. The reaction is allowed to proceed for 1 hour, and the viscosity is tested. When the viscosity of the reactants reaches 5000~2.0×10⁻⁶... 4 At mPa•s / 25℃, the remaining diisocyanate is added, and the NCO content is adjusted to 0.8-6.4%. The reaction is then stopped to obtain the modified polyurethane resin. The obtained modified polyurethane resin is mixed with vinyl silicone oil at a mass ratio of (15-25):(75-85) to obtain the first component. The first component and the second component are mixed at a vinyl:active hydrogen molar ratio of 1:(1.08-1.32), and then a platinum catalyst is added. The mixture is then mixed evenly to obtain the finished two-component organosilicon resin.

[0040] Preferably, the molar ratio of vinyl groups in the first component to the molar ratio of active hydrogen in the hydrogen-containing silicone oil in the second component is 1:(1.18-1.24), and the NCO content of the first component is adjusted to 3.2-4.8% during preparation.

[0041] Step 2: The two-component silicone resin from Step 1 and the silicone resin for mica paper are mixed evenly at a mass ratio of (8-20):(80-92) to obtain a modified silicone resin. The modified silicone resin is then used to press and mold flexible mica paper with an ideal shape and a glue content of 10-16wt%.

[0042] Step 3: Add polyurethane foam resin into a molding mold containing flexible mica paper of the desired shape, and perform compression molding foaming to obtain the finished flexible mica composite material.

[0043] The base coating is a silicone-modified polyurethane adhesive, which contains anhydride-modified polyester polyol, dihydroxyvinyl silicone oil, and / or olefins with unsaturated bonds. The molar amount of dihydroxyvinyl silicone oil is 3-12 wt% of the molar amount of isocyanate in the polyurethane foam resin. The manufacturing process of the high-buffering, heat-insulating mica composite material for new energy vehicle batteries is as follows: First, a silicone-modified polyurethane adhesive is prepared. Then, the silicone-modified polyurethane adhesive is sprayed onto the surface of flexible mica paper. The temperature is raised to 74-78℃ to make the silicone-modified polyurethane adhesive gel-like. Polyurethane foam resin raw materials are added, and molding foaming treatment is performed to obtain the finished flexible mica composite material.

[0044] Example 1: A high-buffering and heat-insulating mica composite material for new energy vehicle batteries, comprising flexible mica paper and a buffer and heat-insulating material integrally formed on the surface of the flexible mica paper, wherein the buffer and heat-insulating material is polyurethane foam resin.

[0045] Flexible mica paper is made of phlogopite powder (average particle size 30-60 micrometers) and Shin-Etsu KR-242A silicone resin from Japan, with the glue content controlled at 12% and the thickness controlled at 0.40±0.02mm.

[0046] The polyurethane foam resin is made from the following raw materials: 1.05 mol MDI (262.78 g), 0.2 mol IPDI (44.46 g), 0.08 mol anhydride-modified polyester polyol with a molecular weight of 2000 (160 g), 0.08 mol polytetrahydrofuran diol with a molecular weight of 3000 (240 g), 0.06 mol polycarbonate diol with a molecular weight of 2000 (120 g PCDL 1012 Polycarbonate diol with a molecular weight of 2000), 0.2 mol 1,4-butene diol (35.25 g), 0.40 mol 1,4-butanediol (36.05 g), 0.4 mol 1,6-hexanediol (47.27 g), and 0.06 mol dihydroxyvinyl silicone oil (hydroxyl-terminated methyl vinyl silicone oil, hydroxyl content: 6.0 ± 0.5). The following ingredients were used: 60g DMF (containing 6.5±0.5mol% vinyl content, purchased from Shenzhen Jipeng Silicon Fluorine Materials Co., Ltd.), 2.4g triethanolamine, 4.8g glycerol, 0.24g bismuth octanoate, 0.08g amine catalyst A-33, 2.4g antioxidant 1010, 0.4g antioxidant 168, 18g deionized water, 6g HFC-245fa, 3.2g silicone surfactant B4113, 12g 2000-mesh aluminum hydroxide, 4g nano magnesium oxide, 4g nano silica powder, and 4g titanium nitride whiskers.

[0047] A method for preparing a high-buffering, heat-insulating mica composite material for new energy vehicle batteries includes the following steps:

[0048] S1, Polyurethane foam resin formulation:

[0049] S1.1, Preparation of anhydride-modified polyester polyol: 24.74 g of 4-methyl-4-cyclohexene-1,2-dicarboxylic anhydride (CAS No.: 3425-89-6), 146 g of adipic acid, 138.2 g of 2,5-dimethyl-1,4-phenylene glycol, 42.96 g of 1,6-hexanediol, and 0.4 g of antioxidant 1010 were added to a reaction vessel, and the mixture was heated to allow the reaction to proceed. In the first stage, the vessel temperature was raised to 135℃ and held for 3.0 h. Then, the temperature was uniformly raised to 230℃ and held for 3.0 h over a period of 4.0 h. h, control the temperature at the top of the distillation column between 102±0.5℃, take a sample to measure the acid value, when the acid value reaches 30mgKOH / g, add 0.025g tetrabutyl titanate and evacuate the vacuum, and evacuate the pressure inside the vessel to a relative vacuum of about 25torr within 4 hours, take a sample to test until the hydroxyl value of the product reaches 56.0mgKOH / g, break the vacuum with nitrogen and cool down to 110℃, and anhydride modified polyester polyol with a molecular weight of 2000 can be obtained;

[0050] S1.2, weigh out the following components according to the specified ratio: MDI (262.78g), IPDI (44.46g), anhydride-modified polyester polyol with a molecular weight of 2000 (160g), polytetrahydrofuran diol with a molecular weight of 3000 (240g), and polycarbonate diol with a molecular weight of 2000 (120g of PCDL 1012 Polycarbonate diol). The following ingredients were added to a reactor: polycarbonate diol (molecular weight 2000), 0.40 mol of 1,4-butanediol (36.05 g), 0.4 mol of 1,6-hexanediol (47.27 g), 0.06 mol of dihydroxyvinyl silicone oil, 60 g of DMF, 2.4 g of triethanolamine, 4.8 g of glycerol, 0.24 g of bismuth caprylate, 0.08 g of amine catalyst A-33, 2.4 g of antioxidant 1010, 0.4 g of antioxidant 168, and 18 g of deionized water. The mixture was reacted at 82°C for 3.0 h. The temperature was then adjusted to 78°C, and 1,4-butenediol (35.25 g) was gradually added to the reactor. The mixture was heated to react with the resulting product to a concentration of 10–12 × 10⁻⁶. 4 After 25℃, the temperature was lowered to 40℃, and 18g of deionized water, 6g of HFC-245fa, 3.2g of silicone surfactant B4113, 12g of 2000-mesh aluminum hydroxide, 4g of nano magnesium oxide, 4g of nano silica powder, and 4g of titanium nitride whiskers were added. The mixture was magnetically stirred at 400rpm for 10min to obtain the finished polyurethane foam resin.

[0051] S2, after cleaning the surface of the flexible mica paper with alcohol cotton, put it into the molding mold, and then add the polyurethane foaming resin obtained in S1.2 into the molding mold for molding and foaming treatment to obtain the finished flexible mica composite material.

[0052] The difference between Example 2 and Example 1 is that the polyurethane foam resin is made from the following raw materials: 0.95 mol MDI (237.75 g), 0.15 mol IPDI (33.37 g), 0.05 mol 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione (26.18 g), 0.08 mol anhydride-modified polyester polyol with a molecular weight of 2000 (160 g), 0.08 mol polytetrahydrofuran diol with a molecular weight of 3000 (240 g), 0.06 mol polycarbonate diol with a molecular weight of 2000 (120 g), and 0.2 mol 1 4-Butenediol (35.25g), 0.40mol of 1,4-butanediol (36.05g), 0.4mol of 1,6-hexanediol (47.27g), 0.06mol of dihydroxyvinyl silicone oil, 60g of DMF, 2.4g of triethanolamine, 4.8g of glycerol, 0.24g of bismuth caprylate, 0.08g of amine catalyst A-33, 2.4g of antioxidant 1010, 0.4g of antioxidant 168, 18g of deionized water, 6g of HFC-245fa, 3.2g of silicone surfactant B4113, 12g of 2000-mesh aluminum hydroxide, 4g of nano magnesium oxide, 4g of nano silica powder, and 4g of titanium nitride whiskers.

[0053] The difference between Example 3 and Example 1 is that the polyurethane foam resin is made from the following raw materials: 0.95 mol MDI (237.75 g), 0.15 mol IPDI (33.37 g), 0.05 mol 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione (26.18 g), 0.08 mol anhydride-modified polyester polyol with a molecular weight of 2000 (160 g), 0.08 mol polytetrahydrofuran diol with a molecular weight of 3000 (240 g), 0.06 mol polycarbonate diol with a molecular weight of 2000 (120 g), and 0.2 mol 1 4-Butenediol (35.25g), 0.38mol of 1,4-butanediol (34.25g), 0.4mol of 1,6-hexanediol (47.27g), 0.08mol of dihydroxyvinyl silicone oil, 60g of DMF, 2.4g of triethanolamine, 4.8g of glycerol, 0.24g of bismuth caprylate, 0.08g of amine catalyst A-33, 2.4g of antioxidant 1010, 0.4g of antioxidant 168, 18g of deionized water, 6g of HFC-245fa, 3.2g of silicone surfactant B4113, 12g of 2000-mesh aluminum hydroxide, 4g of nano magnesium oxide, 4g of nano silica powder, and 4g of titanium nitride whiskers.

[0054] The difference between Example 4 and Example 1 is that the polyurethane foam resin is made from the following raw materials: 0.95 mol MDI (237.75 g), 0.15 mol IPDI (33.37 g), 0.05 mol 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione (26.18 g), 0.08 mol anhydride-modified polyester polyol with a molecular weight of 2000 (160 g), 0.08 mol polytetrahydrofuran diol with a molecular weight of 3000 (240 g), 0.06 mol polycarbonate diol with a molecular weight of 2000 (120 g), and 0.2 mol 1 4-Butenediol (35.25g), 0.36mol of 1,4-butanediol (32.45g), 0.4mol of 1,6-hexanediol (47.27g), 0.10mol of dihydroxyvinyl silicone oil, 60g of DMF, 2.4g of triethanolamine, 4.8g of glycerol, 0.24g of bismuth caprylate, 0.08g of amine catalyst A-33, 2.4g of antioxidant 1010, 0.4g of antioxidant 168, 18g of deionized water, 6g of HFC-245fa, 3.2g of silicone surfactant B4113, 12g of 2000-mesh aluminum hydroxide, 4g of nano magnesium oxide, 4g of nano silica powder, and 4g of titanium nitride whiskers.

[0055] Example 5: A high-buffering, heat-insulating mica composite material for new energy vehicle batteries, comprising flexible mica paper and a buffer and heat-insulating material integrally formed on the surface of the flexible mica paper, wherein the buffer and heat-insulating material is polyurethane foam resin. The flexible mica paper contains a two-component silicone resin with excellent bonding strength to cushioning and heat insulation materials. The first component of the two-component silicone resin is made from the following raw materials: 60g of polytetrahydrofuran diol (molecular weight 3000), 100g of anhydride-modified polyester polyol (molecular weight 2000) prepared in Example 1, 20g of polycarbonate diol (molecular weight 2000), 120g of PCDL 1012 Polycarbonate diol (molecular weight 2000), 16g of ethanolamine, 4g of 1,4-butanediol, 138.96g of MDI, 30.87g of IPDI, 400g of toluene, 0.005g of bismuth octanoate, 0.1g of antioxidant BHT, and 100g of vinyl silicone oil with a vinyl content of 10%. The second component is a hydrogen-containing silicone oil (SHIN-ETSU) with a hydrogen content of 1.6%. KF99 (CAS:7223-15) has a molar ratio of vinyl groups in the first component to active hydrogen in the second component (hydrogen-containing silicone oil) of 1:1.16.

[0056] The preparation method of a high-buffering, heat-insulating mica composite material for new energy vehicle batteries is as follows:

[0057] S1, Preparation of flexible mica paper;

[0058] S1.1, Preparation of two-component silicone resin: 60g of polytetrahydrofuran diol (molecular weight 3000), 100g of anhydride-modified polyester polyol (molecular weight 2000) prepared in Example 1, 20g of polycarbonate diol (molecular weight 2000), 16g of ethanolamine, 4g of 1,4-butanediol, 400g of toluene, 0.005g of bismuth octanoate, and 0.1g of antioxidant BHT were mixed and heated to 45°C with mechanical stirring for 20min. Then, 58.96g of MDI and 30.87g of IPDI were added, and the temperature was adjusted to 78°C. The reaction was carried out for 1h, and the viscosity was tested. When the viscosity of the reactant reached 5*10... 3 ~2.0×10 4 At 25℃, 80g of diisocyanate MDI was added and mixed evenly. The mixture was kept at this temperature for 100s. The NCO content of the system was tested. The NCO content was adjusted to 4.2% by adding diisocyanate MDI. The reaction was then stopped to obtain the modified polyurethane resin. The obtained modified polyurethane resin was mixed evenly with vinyl silicone oil at a mass ratio of 15:85 to obtain the first component. The first component and the second component were mixed at a vinyl:active hydrogen molar ratio of 1:1.16 and a platinum catalyst was added. The mixture was then mixed evenly to obtain the finished two-component organosilicon resin.

[0059] The two-component silicone resin in S1.2 and S1.1 is mixed with KR-242A silicone resin at a mass ratio of 12:88 to obtain a modified silicone resin. The prepared modified silicone resin and phlogopite powder are mixed evenly and then added to a molding die. Flexible phlogopite paper with a thickness of 0.40±0.02mm and a glue content of 12.0%±0.2% is prepared by molding process.

[0060] S2, commercially available polyurethane foam resin (commercially available polyurethane isocyanate combined with polyether Gao'er composite material from Langfang Gao'er Insulation Materials Co., Ltd., with a milky whitening time of 25s, gas evolution of 25ml / g, and viscosity (25℃ mPa·s) of 150-250) is added to a molding die containing flexible mica paper for compression foaming treatment to obtain the finished flexible mica composite material.

[0061] The difference between Example 6 and Example 5 is that the modified polyurethane resin and vinyl silicone oil are mixed evenly at a mass ratio of 20:80 to obtain the first component, and the NCO content in the modified polyurethane resin is up to 3.6%.

[0062] The difference between Example 7 and Example 5 is that the modified polyurethane resin and vinyl silicone oil are mixed evenly at a mass ratio of 25:75 to obtain the first component, and the NCO content in the modified polyurethane resin is up to 2.4%.

[0063] The difference between Example 8 and Example 5 is that the polyurethane foaming resin in Example 1 is added to a molding mold containing flexible mica paper of an ideal shape for compression foaming treatment to obtain the finished flexible mica composite material.

[0064] The difference between Example 9 and Example 5 is that in step two, the polyurethane foaming resin from Example 2 is added to a molding mold containing flexible mica paper of an ideal shape for compression foaming treatment to obtain the finished flexible mica composite material.

[0065] Example 10: A high-buffering, heat-insulating mica composite material for new energy vehicle batteries, comprising flexible mica paper and a buffering and heat-insulating material integrally formed on the surface of the flexible mica paper, wherein the buffering and heat-insulating material is polyurethane foam resin. A base coating is formed between the flexible mica paper and the buffering and heat-insulating material, and the base coating has good adhesion to both the flexible mica paper and the buffering and heat-insulating material.

[0066] The base coat is a silicone-modified polyurethane adhesive. The specific formulation of the silicone-modified polyurethane adhesive is as follows: 1.12 mol MDI (280.3 g), 0.2 mol IPDI (44.46 g), 0.05 mol 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione (26.18 g), 0.08 mol anhydride-modified polyester polyol (160 g), 0.08 mol polytetrahydrofuran diol (240 g), and 0.06 mol polycarbonate diol (120 g). Polycarbonate diol (molecular weight 2000), 0.2 mol of 1,4-butenediol (35.25 g), 0.40 mol of 1,4-butanediol (36.05 g), 0.38 mol of 1,6-hexanediol (44.9 g), 0.08 mol of dihydroxyvinyl silicone oil (hydroxyl-terminated methyl vinyl silicone oil, hydroxyl content: 6.0 ± 0.5, vinyl content: 6.5 ± 0.5 mol%), 60 g of DMF, 2.4 g of ethylene glycol, 0.24 g of bismuth octanoate, 2.4 g of antioxidant 1010, 0.4 g of antioxidant 168, 12 g of 2000 mesh aluminum hydroxide, 4 g of nano magnesium oxide, 4 g of nano silica powder, and 4 g of titanium nitride whiskers.

[0067] The manufacturing process of high-buffering, heat-insulating mica composite material for new energy vehicle batteries is as follows:

[0068] S1, Prepare silicone-modified polyurethane adhesive;

[0069] S1.1, Preparation of anhydride-modified polyester polyol: 14.6 g of 24.74 g of 4-methyl-4-cyclohexene-1,2-dicarboxylic anhydride (CAS No.: 3425-89-6), 146 g of adipic acid, 138.2 g of 2,5-dimethyl-1,4-phenylene glycol, 42.96 g of 1,6-hexanediol, and 0.4 g of antioxidant 1010 were added to a reaction vessel. The mixture was heated to allow the reaction to proceed. In the first stage, the vessel temperature was raised to 135℃ and held for 3.0 h. Then, the temperature was uniformly raised to 230℃ and held for 3.0 h over a period of 4.0 h. h, control the temperature at the top of the distillation column between 102±0.5℃, take a sample to measure the acid value, when the acid value reaches 30mgKOH / g, add 0.025g tetrabutyl titanate and evacuate the vacuum, and evacuate the pressure inside the vessel to a relative vacuum of about 25torr within 4 hours, take a sample to test until the hydroxyl value of the product reaches 56.0mgKOH / g, break the vacuum with nitrogen and cool down to 110℃, and anhydride modified polyester polyol with a molecular weight of 2000 can be obtained;

[0070] S1.2, weigh out the following components according to the specified ratio: MDI (280.3g), IPDI (44.46g), 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione (26.18g), anhydride-modified polyester polyol with a molecular weight of 2000 (160g), polytetrahydrofuran diol with a molecular weight of 3000 (240g), polycarbonate diol with a molecular weight of 2000 (120g of PCDL 1012 Polycarbonate diol with a molecular weight of 2000), 1,4-butanediol (36.05g), 1,6-hexanediol (44.9g), and 0.08mol of dihydroxyvinyl silicone oil (hydroxyl-terminated methylvinyl silicone oil, hydroxyl content: 6.0±0.5). The reaction mixture contained 60g of DMF (containing 6.5±0.5mol% vinyl content), 2.4g of ethylene glycol, 0.24g of bismuth octanoate, 2.4g of antioxidant 1010, and 0.4g of antioxidant 168. After adding the materials to the reactor, the mixture was reacted at 82℃ for 3.0h. The temperature was then adjusted to 78℃, and 35.25g of 1,4-butenediol was gradually added to the reactor. The mixture was heated to react and form 10-12×10⁻⁶ ppm. 4 After cps / 25℃, the temperature was lowered to 40℃, and 12g of 2000 mesh aluminum hydroxide, 4g of nano magnesium oxide, 4g of nano silica powder, and 4g of titanium nitride whiskers were added. The mixture was magnetically stirred at 400rpm for 10min to obtain silicone-modified polyurethane adhesive.

[0071] S2, immediately after the flexible mica paper is pressed into shape in the forming mold, an organosilicon-modified polyurethane adhesive is sprayed onto the surface of the flexible mica paper. The amount of organosilicon-modified polyurethane adhesive used is 3.0 g / m². 2 The pressure is increased to 0.3 MPa while the mold temperature is adjusted to 78±0.5℃. The reaction continues until the silicone-modified polyurethane adhesive on the surface of the flexible mica paper becomes gel-like. Then, commercially available polyurethane foaming resin (polyurethane isocyanate combined with polyether from Langfang Gaoer Insulation Materials Co., Ltd., with a milky whitening time of 25s, gas evolution of 25ml / g, and viscosity (25℃ mPa·s) of 150-250) is added to the raw materials for molding and foaming treatment to obtain the finished flexible mica composite material.

[0072] The difference between Example 11 and Example 1 is as follows: S2, flexible mica paper is placed in a forming mold, and silicone-modified polyurethane adhesive is sprayed onto the surface of the flexible mica paper. The amount of silicone-modified polyurethane adhesive used is 3.0 g / m³. 2 The mold temperature was adjusted to 78±0.5℃ and the reaction continued until the silicone-modified polyurethane adhesive on the surface of the flexible mica paper became gel-like. Then, the polyurethane foaming resin raw material prepared in Example 1 was added for molding and foaming treatment to obtain the finished flexible mica composite material.

[0073] The difference between Example 12 and Example 1 is as follows: S2, flexible mica paper is placed in a forming mold, and silicone-modified polyurethane adhesive is sprayed onto the surface of the flexible mica paper. The amount of silicone-modified polyurethane adhesive used is 3.0 g / m³. 2 The mold temperature was adjusted to 78±0.5℃ to react until the silicone-modified polyurethane adhesive on the surface of the flexible mica paper became gel-like. Then, the polyurethane foaming resin raw material prepared in Example 2 was added for molding and foaming treatment to obtain the finished flexible mica composite material.

[0074] The difference between Comparative Example 1 and Example 1 is that the commercially available polyurethane isocyanate and polyether composite material (from Langfang Gaoer Insulation Materials Co., Ltd.) has a milky whitening time of 25 seconds, a gas evolution of 25 ml / g, and a viscosity (25℃ mPa·s) of 150-250. Usage method: Mix according to the required weight ratio (A:B = 1:1), mechanically stir for 16 seconds at a speed of 1400 rpm, and immediately pour into a mold for curing after uniform mixing. The mold temperature should be 35℃, and the ambient temperature should be 20℃.

[0075] The difference between Comparative Example 2 and Example 1 is that the polyurethane foam resin was made from the following raw materials: 0.95 mol MDI (237.75 g), 0.15 mol IPDI (33.37 g), 0.05 mol 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione (26.18 g), 0.08 mol anhydride-modified polyester polyol with a molecular weight of 2000 (160 g), 0.08 mol polytetrahydrofuran diol with a molecular weight of 3000 (240 g), and 0.06 mol polycarbonate diol with a molecular weight of 2000 (120 g). 0.2 mol of 1,4-butenediol (35.25 g), 0.46 mol of 1,4-butanediol (41.45 g), 0.4 mol of 1,6-hexanediol (47.27 g), 60 g of DMF, 2.4 g of triethanolamine, 4.8 g of glycerol, 0.24 g of bismuth octanoate, 0.08 g of amine catalyst A-33, 2.4 g of antioxidant 1010, 0.4 g of antioxidant 168, 18 g of deionized water, 6 g of HFC-245fa, 3.2 g of silicone surfactant B4113, 12 g of 2000 mesh aluminum hydroxide, 4 g of nano magnesium oxide, 4 g of nano silica powder, and 4 g of titanium nitride whiskers.

[0076] The difference between Comparative Example 3 and Example 10 is that a commercially available polyurethane adhesive, specifically Saint-Gobain TeKPU40, was used.

[0077] The difference between Comparative Example 4 and Example 10 is that the polyurethane adhesive was made from the following raw materials: 1.12 mol of MDI (280.3 g), 0.2 mol of IPDI (44.46 g), 0.05 mol of 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione (26.18 g), 0.08 mol of anhydride-modified polyester polyol with a molecular weight of 2000 (160 g), 0.08 mol of polytetrahydrofuran diol with a molecular weight of 3000 (240 g), and 0.06 mol of polycarbonate diol with a molecular weight of 2000 (120 g of PCDL 1012 Polycarbonate diol). Polycarbonate diol (molecular weight 2000), 0.2 mol of 1,4-butenediol (35.25 g), 0.40 mol of 1,4-butanediol (36.05 g), 0.46 mol of 1,6-hexanediol (54.36 g), 60 g of DMF, 2.4 g of ethylene glycol, 0.24 g of bismuth octanoate, 2.4 g of antioxidant 1010, 0.4 g of antioxidant 168, 12 g of 2000 mesh aluminum hydroxide, 4 g of nano magnesium oxide, 4 g of nano silica powder, and 4 g of titanium nitride whiskers.

[0078] Performance Testing: Thermal conductivity test method: determined according to GB / T 10295-2008. Peel strength test method: determined according to GB / T 2792-2014. Aging resistance test: The flexible mica composite materials in Examples 1-12 and Comparative Examples 1-4 were cut into pieces with dimensions of length * width = 24cm * 18cm and placed in an aging test chamber. They were treated at 85℃ / 80% (humidity) for 1200h, and their peel strength was tested. Flame retardancy test method: determined according to UL94 V-0 flame retardancy test standard. Breakdown voltage test method: determined according to ASTM D149-09.

[0079] As can be seen from Examples 1-12 and Comparative Examples 1-4, compared with Comparative Examples 1-2, the flexible mica composite material prepared in this application has the advantages of flame retardant and fireproof properties and low production cost, while also having excellent buffering and heat insulation effects and good heat resistance and stability.

[0080] As can be seen from Examples 1-12 and Comparative Examples 1-4, the flexible mica composite material prepared in this application has the advantages of flame retardant and fireproof properties and low production cost, as well as excellent buffering and heat insulation effect and good heat resistance and stability.

[0081] As can be seen from Examples 1-12 and Comparative Examples 1-4, a comparison between Examples 1-12 and Comparative Examples 1-4 shows that the good bonding force between the polyurethane foam resin and the silicone resin contained in the flexible mica paper in this application ensures the buffering and heat insulation effect and heat resistance stability of the prepared flexible mica composite material. The flexible phlogopite paper prepared with the silicone resin with excellent bonding force to the buffering and heat insulation material in this application exhibits good adhesion stability to the buffering and heat insulation material, ensuring the buffering and heat insulation effect and heat resistance stability of the prepared flexible mica composite material. The primer-silicone modified polyurethane adhesive in this application can improve the adhesion stability between the flexible mica paper and the polyurethane foam resin material. The flexible mica composite material obtained by combining the above two technical solutions not only has good flame retardant and fireproof properties and low production cost, but also has excellent heat resistance stability.

[0082] In summary, the heat insulation layer and the flexible mica layer in this application do not require the use of special functional adhesives for bonding. Furthermore, research on the formulation and processing of the heat insulation layer material and / or the flexible mica material ensures that the heat insulation layer and the flexible mica layer can be integrally molded into a flexible mica composite material without the need for adhesive application. When used between automotive battery cells, this application not only possesses flame-retardant and fire-resistant properties and low production costs, but also exhibits excellent buffering and heat insulation effects and good heat resistance and stability. Applying this application to lithium battery cells is beneficial for improving the flame-retardant, fire-resistant, safety, and stability performance of lithium battery cell modules.

[0083] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-buffering, heat-insulating mica composite material for new energy vehicle batteries, characterized in that: The invention includes flexible mica paper and a buffer insulation material integrally formed on the surface of the flexible mica paper. The flexible mica paper is made of phlogopite powder and KR-242A silicone resin from Shin-Etsu Chemical Co., Ltd. of Japan, with a glue content controlled at 10-16% and a thickness controlled at 0.2-0.6 mm. The buffer insulation material is polyurethane foam resin. The polyurethane foam resin has good bonding with the silicone resin contained in the flexible mica paper, or the flexible mica paper contains silicone resin with excellent bonding with the buffer insulation material, or a base coating is formed between the flexible mica paper and the buffer insulation material, and the base coating has good bonding with both the flexible mica paper and the buffer insulation material. The polyurethane foam resin, which has good bonding with the silicone resin contained in the flexible mica paper, specifically contains anhydride-modified polyester polyol, dihydroxyvinyl silicone oil, and / or olefins with unsaturated bonds; the molar amount of the dihydroxyvinyl silicone oil is 3-8 wt% of the molar amount of isocyanate in the polyurethane foam resin. The polyurethane foaming resin is mainly composed of polyols, chain extenders, dihydroxyvinyl silicone oil, isocyanates, catalysts, crosslinking agents, foaming agents, foam stabilizers, and functional additives. The polyols are composed of polyether glycols, anhydride-modified polyester polyols, and polycarbonate glycols. The chain extenders are at least one of 1,4-butenediol combined with 1,4-butanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, and 1,4-butanediamine. The isocyanates are MDI, IPDI, and 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H, The product is composed of 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione, wherein the content of 1,3,5-tris(3-isocyanate methylphenyl)-1,3,5-triazine-2,4,6(1H,2H,5H)-trione accounts for 5-10 wt% of the total mass of isocyanate; the foaming agent is water and / or HFC-245fa; the foam stabilizer is one of silicone oil surfactant B8716, silicone surfactant B4113, and silicone surfactant B-8110; and the crosslinking agent is at least one of 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane, triglycidyl isocyanate, triethanolamine, and glycerol. The silicone resin with excellent adhesion to buffer and heat insulation materials is a two-component silicone resin; the first component of the two-component silicone resin includes a polyol, a chain extender, an isocyanate, an organic solvent, a catalyst, an additive, and a vinyl silicone oil. The polyol is composed of polyether glycol, anhydride-modified polyester polyol, and polycarbonate glycol. The vinyl content in the vinyl silicone oil is controlled at 0.06-20 wt%. The second component includes a hydrogen-containing silicone oil with a hydrogen content of 0.03%-1.60%. The molar ratio of the vinyl content in the first component to the molar ratio of the active hydrogen in the second component hydrogen-containing silicone oil is 1:(1.08-1.32). The base coating is a silicone-modified polyurethane adhesive; the silicone-modified polyurethane adhesive contains anhydride-modified polyester polyol, dihydroxyvinyl silicone oil and / or olefins with unsaturated bonds; the molar amount of the dihydroxyvinyl silicone oil is 3-12 wt% of the molar amount of isocyanate in the polyurethane foaming resin; the manufacturing process of the high-buffering, heat-insulating mica composite material for new energy vehicle batteries is as follows: first, prepare silicone-modified polyurethane adhesive, then spray silicone-modified polyurethane adhesive onto the surface of flexible mica paper, heat to 74-78℃ to make the silicone-modified polyurethane adhesive into a gel state, add polyurethane foaming resin raw materials and perform molding foaming treatment to obtain the finished flexible mica composite material.

2. The high-buffering, heat-insulating mica composite material for new energy vehicle batteries according to claim 1, characterized in that: The functional additives include flame retardants, anti-aging agents, and toughening agents; the flame retardant is at least one of aluminum hydroxide (800 mesh or finer), magnesium hydroxide, nano magnesium oxide, and nano silica powder; the anti-aging agent is at least one of antioxidant 1010, antioxidant 1098, and antioxidant 168; and the toughening agent is at least one of nano alumina powder, titanium nitride whiskers, and boron nitride nanosheets.

3. The high-buffering, heat-insulating mica composite material for new energy vehicle batteries according to claim 1, characterized in that: The preparation method of the two-component organosilicon resin is as follows: The prepared anhydride-modified polyester polyol is mixed with polyether diol, polycarbonate diol, chain extender, organic solvent, catalyst, and additives, then heated to 42-48℃ and mechanically stirred for 20-30 minutes. A portion of diisocyanate is added, and the temperature is adjusted to 74-78℃. The reaction is allowed to proceed for 1 hour, and the viscosity is tested. When the viscosity of the reactants reaches 5000~2.0×10⁻⁶... 4 At mPa•s / 25℃, the remaining diisocyanate is added, and the NCO content is adjusted to 0.8-6.4%. The reaction is then stopped to obtain the modified polyurethane resin. The obtained modified polyurethane resin is mixed with vinyl silicone oil at a mass ratio of (15-25):(75-85) to obtain the first component. The first component and the second component are mixed at a vinyl:active hydrogen molar ratio of 1:(1.08-1.32), and then a platinum catalyst is added. The mixture is then mixed evenly to obtain the finished two-component organosilicon resin.

4. The high-buffering, heat-insulating mica composite material for new energy vehicle batteries according to claim 3, characterized in that: The molar ratio of vinyl groups in the first component to active hydrogen in the second component (hydrogen-containing silicone oil) is 1:(1.18-1.24); the NCO content of the first component is adjusted to 3.2-4.8% during preparation.

5. A method for preparing a high-buffering, heat-insulating mica composite material for new energy vehicle batteries according to any one of claims 1-2, characterized in that: Includes the following steps: Step 1: Preparation of the polyurethane foam resin that has good bonding strength with the organosilicon resin contained in the flexible mica paper; Step 2: After cleaning the surface of the flexible mica paper, place it into the molding mold, and then add the polyurethane foam resin obtained in Step 1 into the molding mold. The finished flexible mica composite material is obtained by compression molding and foaming.

6. A method for preparing a high-buffering, heat-insulating mica composite material for new energy vehicle batteries according to any one of claims 3-4, characterized in that: Includes the following steps: Step 1: Preparation of two-component silicone resin; Step 2: The two-component silicone resin from Step 1 and the silicone resin for mica paper are mixed evenly at a mass ratio of (8-20):(80-92) to obtain a modified silicone resin. The modified silicone resin is then used to press and mold flexible mica paper with an ideal shape and a glue content of 10-16wt%. Step 3: Add polyurethane foam resin into a molding mold containing flexible mica paper of the desired shape, and perform compression molding foaming to obtain the finished flexible mica composite material.