Fireproof heat-insulation glue as well as preparation method and application thereof

Abstract

The invention relates to the technical field of fireproof heat insulation materials, and discloses fireproof heat insulation glue as well as a preparation method and application thereof. The fireproof heat insulation glue comprises a component A and a component B, the component A is prepared from the following preparation raw materials in parts by mass: 90 to 110 parts of polydiphenyl siloxane; 50 to 180 parts of organic silicon resin; 90 to 210 parts of filler; the component B is prepared from the following raw materials in parts by mass: 90 to 110 parts of polydiphenyl siloxane; 50 to 170 parts of a cross-linking agent; 10 to 80 parts of an adhesion promoter; 5-60 parts of a thixotropic agent; 1-8 parts of a catalyst; the filler comprises ceramic powder, hollow glass microspheres and hollow silicon dioxide microspheres. The fireproof and heat-insulating adhesive provided by the invention has the advantages of fire prevention, heat insulation, light weight, easiness in forming and controllable coating thickness, and can be used as a thermal protection material of a battery shell to reduce the risk of blast of a battery.

Description

Technical Field

[0001] The invention relates to the technical field of fireproof and heat-insulating materials, and in particular to a fireproof and heat-insulating adhesive and a preparation method and application thereof. Background Art

[0002] As the energy density of new energy batteries increases, the risk of battery explosion is also increasing. At present, the thermal protection materials used in the field of new energy batteries mainly include mica sheets and coatings. These materials can reduce the hazard of battery thermal runaway to a certain extent, but they still have the following defects: (1) The traditional process is to load 1-2mm thick mica sheets into the battery shell for fireproof and heat insulation treatment, but the mica sheet has a large specific gravity and is not easy to shape; (2) The existing fireproof materials only have fireproof properties and cannot meet the insulation requirements; (3) The thermal insulation material has insulation properties at room temperature, but it is easy to collapse and lose its fireproof and heat insulation capabilities under flame combustion, and cannot be used for battery fireproof and heat insulation; (4) The intumescent fireproof material achieves fireproof and heat insulation through expansion, and has good fireproof and heat insulation properties, but it is not suitable for confined spaces such as battery shells; (5) Ceramic foamed silicone achieves fireproof and heat insulation through foaming reaction, but its thickness is difficult to control. Therefore, the development of lightweight, easy-to-shape materials with both fireproof and heat insulation functions is of great significance to reduce the risk of battery explosion and improve the safety factor. Summary of the invention

[0003] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, one of the purposes of the present invention is to provide a fireproof heat-insulating adhesive; the second purpose of the present invention is to provide a method for preparing the fireproof heat-insulating adhesive; the third purpose of the present invention is to provide an application of the fireproof heat-insulating adhesive.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A first aspect of the present invention provides a fireproof and heat-insulating adhesive, comprising a component A and a component B;

[0006] The A component includes the following raw materials in parts by weight:

[0007] Polydiphenylsiloxane 90-110 parts;

[0008] 50-180 parts of silicone resin;

[0009] 90-210 parts of filler;

[0010] The B component includes the following raw materials in parts by weight:

[0011]

[0012]

[0013] In the component A, the filler includes ceramic powder, hollow glass microspheres and hollow silica microspheres.

[0014] In some embodiments of the present invention, the A component includes the following raw materials in parts by weight:

[0015] Polydiphenylsiloxane 95-100 parts;

[0016] 80-150 parts of silicone resin;

[0017] 100-200 parts of filler;

[0018] The B component includes the following raw materials in parts by weight:

[0019]

[0020] In some embodiments of the present invention, the mass ratio of component A to component B is (9-12):1.

[0021] In some specific embodiments of the present invention, the mass ratio of component A to component B is (10-11):1.

[0022] In some embodiments of the present invention, the organosilicon resin has a structure shown in Formula I:

[0023]

[0024] Wherein, R is selected from -CH 3 , -C 2 H 5 、-Si(CH 3 ) 3 One of the following; x+y+z=1, 0≤x<1, 0<y≤1, 0≤z<1.

[0025] In some embodiments of the present invention, the solid content of the silicone resin is 50-70 wt %.

[0026] In the present invention, the organic silicone resin is phenyl silicone resin, which has good flame retardancy and high temperature resistance and can delay combustion. When the combustion temperature reaches above 450°C, the polymer begins to decompose and produces SiO 2 .

[0027] In some embodiments of the present invention, the viscosity of the polydiphenylsiloxane at 25° C. is 50-100 mPa·s; the test standard is GB / T 9751.1-2008 “Paints and varnishes. Determination of viscosity using a rotational viscometer. Part 1: Cone and plate viscometer operating at high shear rates”.

[0028] In some specific embodiments of the present invention, the viscosity of the polydiphenylsiloxane at 25° C. is 50-70 mPa·s.

[0029] In some embodiments of the present invention, the mass ratio of the ceramic powder, the hollow glass microspheres and the hollow silica microspheres is 10:(1-4):(2-10).

[0030] In some specific embodiments of the present invention, the mass ratio of the ceramic powder, the hollow glass microspheres and the hollow silica microspheres is 10:(1.5-3):(2.5-8).

[0031] In some embodiments of the present invention, the ceramic powder comprises silicate and metal oxide in a mass ratio of (40-200):1.

[0032] In some specific embodiments of the present invention, the ceramic powder comprises silicate and metal oxide in a mass ratio of (49-199):1.

[0033] In some embodiments of the present invention, the particle size Dn50 of the silicate is 5-25 μm.

[0034] In some specific embodiments of the present invention, the particle size Dn50 of the silicate is 5-20 μm.

[0035] In some embodiments of the present invention, the silicate is selected from at least one of mica powder, kaolin, wollastonite, bentonite, aluminum silicate and magnesium silicate.

[0036] In some embodiments of the present invention, the particle size Dn50 of the metal oxide is 3-25 μm.

[0037] In some specific embodiments of the present invention, the particle size Dn50 of the metal oxide is 5-20 μm.

[0038] In some specific embodiments of the present invention, the ignition loss of the metal oxide is ≤5%.

[0039] In some embodiments of the present invention, the metal oxide is selected from at least one of aluminum oxide, magnesium oxide and zinc oxide.

[0040] In some embodiments of the present invention, the melting point of the hollow glass microspheres is 600-800°C.

[0041] In some embodiments of the present invention, the particle size Dn50 of the hollow glass microspheres is 5-25 μm.

[0042] In some specific embodiments of the present invention, the particle size Dn50 of the hollow glass microspheres is 5-20 μm.

[0043] In some embodiments of the present invention, the particle size Dn50 of the hollow silica microspheres is 10-25 μm.

[0044] In some specific embodiments of the present invention, the particle size Dn50 of the hollow silica microspheres is 10-20 μm.

[0045] In the present invention, a composite filler of ceramic powder, hollow glass microspheres and hollow silica microspheres is selected. The hollow glass microspheres can gradually soften at 600-800°C to form a flux to fill the gaps in the material, and together with the ceramic powder, form a dense ceramic layer at a high temperature of 900-1000°C, thereby ensuring the fireproof performance of the fireproof and heat-insulating adhesive. The hollow structure of the hollow silica microspheres can still maintain the hollow structure without collapse at a high temperature of 1000°C, thereby ensuring the heat-insulating performance of the material under flames. In addition, the use of hollow structure fillers can reduce the specific gravity of the material and meet the requirements of lightweight design.

[0046] In some embodiments of the present invention, the crosslinking agent is selected from at least one of methyltrimethoxysilane, methyltriethoxysilane, methyltriethoxysilane oligomer, propyltrimethoxysilane, vinyltrimethoxysilane, tetraethoxysilane, tetramethoxysilane, tetraethoxysilane oligomer and tetramethoxysilane oligomer.

[0047] In some embodiments of the present invention, the adhesion promoter is selected from at least one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, aminoethylaminopropyltrimethoxysilane, aminoethylaminopropyltriethoxysilane, aminoethylaminopropylmethyldimethoxysilane and aminoethylaminopropylmethyldiethoxysilane.

[0048] In some embodiments of the present invention, the thixotropic agent comprises maleic anhydride functionalized liquid polybutadiene.

[0049] In some embodiments of the present invention, the catalyst is selected from at least one of dibutyltin dilaurate, dioctyltin dilaurate, stannous octoate and dibutyltin diacetate.

[0050] In some embodiments of the present invention, the method for using the fireproof and heat-insulating adhesive is as follows: 30-50 minutes before use, mechanically mix the component A and the component B in a mass ratio of (9-12):1 to obtain the fireproof and heat-insulating adhesive and then apply the mixture.

[0051] In some embodiments of the present invention, the specific gravity of the fireproof and heat-insulating adhesive is 1-1.2 mg / L.

[0052] In some embodiments of the present invention, the coating method of the fireproof and heat-insulating adhesive includes airless spraying.

[0053] In some embodiments of the present invention, the fireproof and heat-insulating adhesive is applied to form a coating.

[0054] In some embodiments of the present invention, the thickness of the fireproof and heat-insulating adhesive coating is 1-1.2 mm.

[0055] In some embodiments of the present invention, the curing temperature of the coating is 40-60°C.

[0056] In some embodiments of the present invention, the curing time of the coating is 25-35 minutes.

[0057] The second aspect of the present invention provides a method for preparing the fireproof and heat-insulating adhesive according to the first aspect of the present invention, comprising the following steps:

[0058] The polydiphenylsiloxane in component A and the silicone resin are mixed at 80-130° C. and vacuum conditions of -0.090 to -0.1 MPa for 2-5 hours, the temperature is lowered, a filler is added, and vacuum mixing is continued for 1-3 hours to obtain the component A;

[0059] The polydiphenylsiloxane in component B is heated and dehydrated at 110-130° C. and vacuum -0.90 to -0.1 MPa, then cooled to below 40° C., and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence, and the pressure is maintained and dispersed for 20-30 minutes to obtain the component B.

[0060] The third aspect of the present invention provides the application of the fireproof and heat-insulating adhesive described in the first aspect of the present invention in new energy batteries.

[0061] In some embodiments of the present invention, the fireproof and heat-insulating adhesive is applied to the outer shell of the new energy battery.

[0062] In some embodiments of the present invention, the new energy battery is a high energy density battery.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] 1) The fireproof and heat-insulating adhesive provided by the present invention provides excellent fireproof and heat-insulating properties by adding ceramic powder, hollow glass microspheres and hollow silica microsphere composite fillers, and the coating can resist 1000°C high-temperature flame combustion; the hollow filler reduces the specific gravity of the material while providing heat-insulating properties under fire-resistant conditions, and the coating is easy to form and the thickness is easy to control;

[0065] 2) The fireproof and heat-insulating adhesive provided by the present invention, by adding polydiphenylsiloxane and phenyl-containing silicone resin, provides better flame retardant and high temperature resistance, and can delay combustion;

[0066] 3) The method for preparing the fireproof and heat-insulating adhesive provided by the present invention has simple steps, mild process conditions, and is easy to realize industrial production;

[0067] 4) The fireproof and heat-insulating adhesive provided by the present invention has the advantages of fireproofing, heat insulation, light weight, easy molding, and controllable coating thickness. It can be used as a thermal protection material for battery shells to reduce the risk of battery explosion. DETAILED DESCRIPTION

[0068] The present invention is further described in detail below by specific examples. Unless otherwise specified, the raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial sources or can be obtained by prior art methods. Unless otherwise specified, the experiments or test methods are conventional methods in the art.

[0069] 1. The organic silicon resin used in the following examples and comparative examples has the structure shown in Formula I:

[0070]

[0071] Wherein, R is selected from -CH 3 , -C 2 H 5 、-Si(CH 3 ) 3 One of the following; x+y+z=1, 0≤x<1, 0<y≤1, 0≤z<1.

[0072] 2. “Parts” mentioned below refer to “parts by mass” unless otherwise specified.

[0073] Example 1

[0074] This embodiment prepares a fireproof and heat-insulating adhesive, and the components and contents are shown in Table 1:

[0075] Table 1 Components and contents of fireproof and heat-insulating adhesive in Example 1

[0076]

[0077]

[0078] The preparation steps are as follows:

[0079] The polydiphenylsiloxane in component A is mixed with the silicone resin, and the mixture is heated under vacuum at -0.09 MPa to -0.1 MPa and 100°C for 3 hours to remove the solvent in the silicone resin. After cooling, fillers are added and the mixture is mixed under vacuum for 2 hours to obtain component A.

[0080] The polydiphenylsiloxane in component B is vacuum dehydrated at -0.09MPa to -0.1MPa and 120°C for 2h, cooled to below 40°C, and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence. The mixture is stirred and dispersed under pressure for 20min to obtain component B.

[0081] Example 2

[0082] This embodiment prepares a fireproof heat-insulating adhesive, and the components and contents are shown in Table 2:

[0083] Table 2 Components and contents of fireproof and heat-insulating adhesive in Example 2

[0084]

[0085] The preparation steps are as follows:

[0086] The polydiphenylsiloxane in component A is mixed with the silicone resin, and the mixture is heated under vacuum at -0.09 MPa to -0.1 MPa and 85°C for 5 hours to remove the solvent in the silicone resin. After cooling, fillers are added and the mixture is mixed under vacuum for 2 hours to obtain component A.

[0087] The polydiphenylsiloxane in component B is vacuum dehydrated at -0.09MPa to -0.1MPa and 120°C for 2h, cooled to below 40°C, and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence. The mixture is stirred and dispersed under pressure for 25min to obtain component B.

[0088] Example 3

[0089] This embodiment prepares a fireproof heat-insulating adhesive, and the components and contents are shown in Table 3:

[0090] Table 3 Components and contents of fireproof and heat-insulating adhesive in Example 3

[0091]

[0092] The preparation steps are as follows:

[0093] The polydiphenylsiloxane in component A is mixed with the silicone resin, and the mixture is heated under vacuum at -0.09 MPa to -0.1 MPa and 120°C for 3 hours to remove the solvent in the silicone resin. After cooling, fillers are added and the mixture is mixed under vacuum for 2 hours to obtain component A.

[0094] The polydiphenylsiloxane in component B is vacuum dehydrated at -0.09MPa to -0.1MPa and 130°C for 1.5h, cooled to below 40°C, and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence. The mixture is stirred and dispersed under pressure for 30min to obtain component B.

[0095] Example 4

[0096] This embodiment prepares a fireproof and heat-insulating adhesive, and the components and contents are shown in Table 4:

[0097] Table 4 Components and contents of fireproof and heat-insulating adhesive in Example 4

[0098]

[0099]

[0100] The preparation steps are as follows:

[0101] The polydiphenylsiloxane in component A is mixed with the silicone resin, and the mixture is heated under vacuum at -0.09 MPa to -0.1 MPa and 130°C for 2 hours to remove the solvent in the silicone resin. After cooling, fillers are added and the mixture is mixed under vacuum for 2 hours to obtain component A.

[0102] The polydiphenylsiloxane in component B is vacuum dehydrated at -0.09MPa to -0.1MPa and 120°C for 2h, cooled to below 40°C, and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence. The mixture is stirred and dispersed under pressure for 30min to obtain component B.

[0103] Example 5

[0104] This embodiment prepares a fireproof and heat-insulating adhesive, and the components and contents are shown in Table 5:

[0105] Table 5 Components and contents of fireproof and heat-insulating adhesive in Example 5

[0106]

[0107]

[0108] The preparation steps are as follows:

[0109] The polydiphenylsiloxane in component A is mixed with the silicone resin, and the mixture is heated under vacuum at -0.09 MPa to -0.1 MPa and 130°C for 2 hours to remove the solvent in the silicone resin. After cooling, fillers are added and the mixture is mixed under vacuum for 2 hours to obtain component A.

[0110] The polydiphenylsiloxane in component B is vacuum dehydrated at -0.09MPa to -0.1MPa and 120°C for 2h, cooled to below 40°C, and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence. The mixture is stirred and dispersed under pressure for 30min to obtain component B.

[0111] Comparative Example 1

[0112] This comparative example prepares a fireproof and heat-insulating adhesive, the components and contents of which are shown in Table 6:

[0113] Table 6 Components and contents of fireproof and heat-insulating adhesive in comparative example 1

[0114]

[0115] The preparation steps are as follows:

[0116] The polydiphenylsiloxane in component A is mixed with MQ resin, and the mixture is heated under vacuum at -0.09MPa to -0.1MPa and 130°C for 2h to remove the solvent in the resin. After cooling, fillers are added and the mixture is mixed under vacuum for 2h to obtain component A.

[0117] The polydiphenylsiloxane in component B is vacuum dehydrated at -0.09MPa to -0.1MPa and 120°C for 2h, cooled to below 40°C, and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence. The mixture is stirred and dispersed under pressure for 30min to obtain component B.

[0118] Comparative Example 2

[0119] This comparative example prepares a fireproof and heat-insulating adhesive, the components and contents of which are shown in Table 7:

[0120] Table 7 Components and contents of fireproof and heat-insulating adhesive in comparative example 2

[0121]

[0122] The preparation steps are as follows:

[0123] The polydiphenylsiloxane in component A is mixed with the silicone resin, and the mixture is heated under vacuum at -0.09 MPa to -0.1 MPa and 130°C for 2 hours to remove the solvent in the silicone resin. After cooling, fillers are added and the mixture is mixed under vacuum for 2 hours to obtain component A.

[0124] The polydiphenylsiloxane in component B is vacuum dehydrated at -0.09MPa to -0.1MPa and 120°C for 2h, cooled to below 40°C, and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence. The mixture is stirred and dispersed under pressure for 30min to obtain component B.

[0125] Comparative Example 3

[0126] This comparative example prepares a fireproof and heat-insulating adhesive, the components and contents of which are shown in Table 8:

[0127] Table 8 Components and contents of fireproof and heat-insulating adhesive in comparative example 3

[0128]

[0129]

[0130] The preparation steps are as follows:

[0131] The polydiphenylsiloxane in component A is mixed with the silicone resin, and the mixture is heated under vacuum at -0.09 MPa to -0.1 MPa and 130°C for 2 hours to remove the solvent in the silicone resin. After cooling, fillers are added and the mixture is mixed under vacuum for 2 hours to obtain component A.

[0132] The polydiphenylsiloxane in component B is vacuum dehydrated at -0.09MPa to -0.1MPa and 120°C for 2h, cooled to below 40°C, and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence. The mixture is stirred and dispersed under pressure for 30min to obtain component B.

[0133] Performance Testing

[0134] The components A and B in Examples 1-5 and Comparative Examples 1-3 were mechanically mixed at a mass ratio of 10:1 to obtain a fireproof heat-insulating adhesive. The specific gravity of the fireproof heat-insulating adhesive was tested. The fireproof heat-insulating adhesive was sprayed on a 1 mm thick aluminum plate by airless spraying and cured at 50° C. for 30 min to form a coating. The coating thickness, hardness, adhesion, flame retardancy, voltage resistance, voltage resistance after combustion, fire resistance and acid and alkali resistance were tested. The test methods or reference standards are as follows:

[0135] 1. Hardness: Tested in accordance with GB / T 531.1-2008 "Vulcanized rubber or thermoplastic rubber. Indentation hardness test method", HD;

[0136] 2. Adhesion: Tested in accordance with GB / T 5210-2006 "Adhesion test for paints and varnishes by pull-off method", MPa;

[0137] 3. Flame retardancy (1mm): Tested in accordance with GB / T 2408-2008 "Horizontal and vertical methods for determination of combustion performance of plastics";

[0138] 4. Withstand voltage (≤1mA, 1kvDC, 60s): Tested in accordance with GB / T 1695-2005 "Determination of power frequency voltage breakdown strength and withstand voltage of vulcanized rubber";

[0139] 5. Withstand voltage after burning (≤1mA, 1kvDC, 60s): Use a butane spray gun to burn horizontally at 1000℃ for 10min and then test according to GB / T 1695-2005 "Determination method of power frequency voltage breakdown strength and withstand voltage of vulcanized rubber";

[0140] 6. Fire resistance: Use a butane spray gun to burn horizontally at 1000℃ for 10 minutes and then test the back-fire surface temperature, ℃;

[0141] 7. Acid / alkali resistance: Test in accordance with GB23864-2023 "Fireproof Sealing Materials".

[0142] The performance test results of the fireproof and heat-insulating adhesives in Examples 1-5 and Comparative Examples 1-3 are shown in Table 9 below:

[0143] Table 9 Performance test results of fireproof and heat-insulating adhesive in Examples 1-5 and Comparative Examples 1-3

[0144]

[0145] It can be seen from Table 9 that the fireproof and heat-insulating adhesive prepared in Examples 1-5 has fireproof, heat-insulating and flame-retardant properties. After the coating formed by spraying is burned horizontally at 1000°C for 10 minutes, the back-fire surface temperature is less than or equal to 190°C, and the coating does not crack, and still has good voltage resistance. In Comparative Example 1, MQ resin is used, and the flame retardant performance of the coating decreases; in Comparative Example 2, no metal oxide ceramic powder and hollow glass microspheres are added, and the fireproof performance of the coating decreases. After burning horizontally at 1000°C for 10 minutes, the back-fire surface temperature reaches 350°C, the coating cracks, and there is no strength after burning; in Comparative Example 3, no hollow silica microspheres are added, and the thermal insulation performance of the coating decreases. After burning horizontally at 1000°C for 10 minutes, the back-fire surface temperature reaches 550°C, the coating cracks, and there is no strength after burning.

[0146] It can be seen that in the fireproof and heat-insulating adhesive provided by the present invention, the silicone resin can provide good flame retardant and high temperature resistance, and can delay combustion; in the filler, the composite ceramic powder, hollow glass microspheres and hollow silica microspheres play a synergistic role to jointly provide heat insulation and fireproof effects, so that the coating still has a low back-fire surface temperature after high-temperature flame combustion, and no cracking occurs. In addition, the fireproof and heat-insulating adhesive has a low specific gravity and can be applied by airless spraying. The coating is easy to form and the thickness is easy to control. Compared with existing fireproof and heat-insulating materials, the coating hardness, adhesion, acid and alkali resistance and other properties are also at a relatively good level, and can be used in thermal protection of high-energy density batteries, reduce the risk of battery explosion, and improve safety performance.

Claims

1. A fireproof and heat-insulating adhesive, characterized in that: It includes component A and component B; The A component includes the following raw materials in parts by weight: Polydiphenylsiloxane 90-110 parts; 50-180 parts of silicone resin; 90-210 parts of filler; The B component includes the following raw materials in parts by weight: In the component A, the filler includes ceramic powder, hollow glass microspheres and hollow silica microspheres.

2. The fireproof and heat-insulating adhesive according to claim 1, characterized in that: The mass ratio of component A to component B is (9-12):

1.

3. The fireproof and heat-insulating adhesive according to claim 1, characterized in that: The organic silicone resin has a structure shown in Formula I: Wherein, R is selected from one of -CH3, -C2H5, and -Si(CH3)3; x+y+z=1, 0≤x<1, 0<y≤1, 0≤z<1.

4. The fireproof and heat-insulating adhesive according to claim 1, characterized in that: The viscosity of the polydiphenylsiloxane at 25° C. is 50-100 mPa·s.

5. The fireproof and heat-insulating adhesive according to claim 1, characterized in that: The mass ratio of the ceramic powder, the hollow glass microspheres and the hollow silica microspheres is 10:(1-4):(2-10).

6. The fireproof and heat-insulating adhesive according to claim 1 or 5, characterized in that: The ceramic powder comprises silicate and metal oxide in a mass ratio of (40-200):

1.

7. The fireproof and heat-insulating adhesive according to claim 6, characterized in that: The particle size Dn50 of the silicate is 5-25 μm; And / or, the particle size Dn50 of the metal oxide is 3-25 μm; And / or, the loss on ignition of the metal oxide is ≤5%.

8. The fireproof and heat-insulating adhesive according to claim 1 or 5, characterized in that: The melting point of the hollow glass microspheres is 600-800°C; And / or, the particle size Dn50 of the hollow glass microspheres is 5-25 μm; And / or, the particle size Dn50 of the hollow silica microspheres is 10-25 μm.

9. The method for preparing the fireproof and heat-insulating adhesive according to any one of claims 1 to 8, characterized in that: The following steps are involved: The polydiphenylsiloxane in component A and the silicone resin are mixed at 80-130° C. and vacuum conditions of -0.090 to -0.1 MPa for 2-5 hours, the temperature is lowered, a filler is added, and vacuum mixing is continued for 1-3 hours to obtain the component A; The polydiphenylsiloxane in component B is heated and dehydrated at 110-130° C. and vacuum -0.90 to -0.1 MPa, then cooled to below 40° C., and a crosslinking agent, an adhesion promoter, a thixotropic agent and a catalyst are added in sequence, and the pressure is maintained and dispersed for 20-30 minutes to obtain the component B.

10. Application of the fireproof and heat-insulating adhesive according to any one of claims 1 to 8 in new energy batteries.

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