Silicone rubber foam material and preparation method thereof

Abstract

The invention discloses a silicone rubber foam material and a preparation method thereof. The silicone rubber foam material is prepared by mixing a component A and a component B in equal mass. The base rubber of the silicone rubber foam material takes vinyl hydroxyl silicone oil as a main body, 110 raw rubber is compounded and added, the mechanical property of silicone rubber foam can be effectively improved, the dispersity of the base rubber in a rubber material can be improved by adding modified aluminum hydroxide powder, the embrittlement degree of the material is reduced, and the flame retardant rating can reach V0; therefore, the material has a good application prospect in new energy battery materials.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a silicone rubber foam material and a preparation method thereof. Background Art

[0002] Silicone rubber foam material is a porous polymer elastic material made by foaming silicone rubber, also known as sponge silicone rubber or microporous silicone rubber. Silicone rubber foam material not only retains the advantages of silicone rubber material itself, but also has the characteristics of light weight and excellent shock absorption performance. Conventional low-density silicone rubber has low tensile strength and low compressive stress, while silicone rubber with high tensile strength and high compressive stress often has a relatively high density, which loses the buffering and shock absorption function and cannot meet the requirements of lightweight and high mechanical properties of batteries for new energy vehicles. Summary of the invention

[0003] In view of the defects of the prior art, the object of the present invention is to provide a silicone rubber foam material and a preparation method thereof, wherein the prepared silicone rubber foam material has both good mechanical properties and flame retardant properties.

[0004] To achieve the above-mentioned purpose, the present invention provides a silicone rubber foam material, comprising two components A and B; component A, calculated by mass, comprises 35-45 parts of base rubber, 20-30 parts of α, ω-dihydroxy polydimethylsiloxane, 0.5-2 parts of 110 raw rubber, 10-20 parts of hydroxy silicone oil, 50-80 parts of modified aluminum hydroxide powder, and 0.5-2 parts of platinum catalyst; component B, calculated by mass, comprises 20-35 parts of base rubber, 30-50 parts of terminal vinyl polydimethylsiloxane, 0.5-2 parts of 110 raw rubber, 10-35 parts of hydrogen-containing silicone oil, 50-80 parts of modified aluminum hydroxide powder, and 1-3 parts of inhibitor; the base rubber contains 80-85% by mass of vinyl hydroxy silicone oil and 15-20% of fumed silica.

[0005] Furthermore, the vinyl hydroxy silicone oil has a hydroxyl content of 4-9% and a vinyl content of 3-9%, preferably a hydroxyl content of 3.5-4.5% and a vinyl content of 3.5-4.5%; the specific surface area of ​​the fumed silica is 200-380 m 2 / g, preferably 300-380m 2 / g.

[0006] Furthermore, the viscosity of the α,ω-dihydroxy polydimethylsiloxane is 10000-100000cps, preferably 20000-80000cps; the viscosity of the vinyl-terminated polydimethylsiloxane is 10000-100000cps, preferably 20000-60000cps; the 110 raw rubber is 110-1 (vinyl content 1%) and / or 110-4 (vinyl content 3%); the content of hydroxyl groups in the hydroxy silicone oil is 0.7-5 %, preferably 2-4%, and a viscosity of 5-100cps, preferably 25-50cps; the hydrogen-containing silicone oil is selected from hydrogen-containing silicone oil 1 and hydrogen-containing silicone oil 2, the mass ratio of hydrogen-containing silicone oil 1 to hydrogen-containing silicone oil 2 is 1-3:1, preferably 1.7-1.9:1, the hydrogen content of hydrogen-containing silicone oil 1 is 0.8-1.6%, and the hydrogen content of hydrogen-containing silicone oil 2 is 0.07-0.28%; the modified aluminum hydroxide is prepared by modifying aluminum hydroxide with a particle size of 1-5μm, preferably a particle size of 1-2μm.

[0007] Furthermore, the platinum catalyst is a Custer platinum catalyst; and the inhibitor is selected from at least one of 2-methyl-3-alkyn-2-ol, 3-methyl-1-alkyn-3-ol, and ethynyl cyclohexanol.

[0008] Specifically, the α,ω-dihydroxy polydimethylsiloxane, 110 raw rubber, and vinyl-terminated polydimethylsiloxane in the present invention are all from Hubei Xingrui Silicon Materials Co., Ltd.; Hydroxy silicone oil was purchased from Jiangsu Quanli Chemical Co., Ltd.; Hydrogenated silicone oil was purchased from Ningbo Runhe High-tech Materials Technology Co., Ltd. and Zhejiang Xin'an Chemical Group Co., Ltd.; The vinyl hydroxy silicone oil was purchased from Hubei Shineng Chemical Technology Co., Ltd., with a vinyl content of 4% and a hydroxyl content of 4%; The fumed silica was purchased from Hubei Huifu Nanomaterials Co., Ltd.

[0009] Under the same technical concept, the present invention also provides a method for preparing a silicone rubber foam material, comprising the following steps: (1) Preparation of modified aluminum hydroxide: Add a pre-dispersed aluminum hydroxide suspension with a solid content of 15-30% into a mixer, wherein the suspension solvent is pure water, and add ethyltriethoxysilane and isopropanol to the mixer in sequence, stir and mix under heating conditions, take out, vacuum filter and dry to obtain modified aluminum hydroxide powder; Preparation of base rubber: Add vinyl hydroxy silicone oil and fumed silica in batches to a kneader at 120-140°C under normal pressure and knead for 10-30 minutes after each addition. The stirring time increases with the increase in the total amount of material. After the last stirring and mixing is completed, keep the material under vacuum for 3-5 hours to obtain the base rubber; (2) Stirring and mixing the materials in the above-mentioned component A to obtain material A; (3) Stirring and mixing the materials in the above-mentioned component B to obtain material B; (4) Weigh equal masses of material A and material B, stir them quickly at room temperature, coat the resulting mixture on a pre-prepared release film, and vulcanize them in two stages in an oven after passing through a calender set to the required height. The first stage vulcanization temperature is 50-70°C for 5-10 minutes, and the second stage vulcanization temperature is 150-180°C for 30-40 minutes.

[0010] Furthermore, in step (1), the mass volume ratio of ethyltriethoxysilane to isopropanol is 1:5-10 g / ml, preferably 1:7-9 g / ml, the mass ratio of ethyltriethoxysilane to aluminum hydroxide is 45-55:1, the heating temperature is 70-90°C, the drying temperature is 50-60°C, and the stirring speed of the base rubber is 80-150 r / min, preferably 100-120 r / min; in steps (2) and (3), the stirring and dispersing time of components A and B is 10-120 min, the dispersing speed is 400-600 r / min, and the stirring speed is 30-50 r / min; in step (4), the mixing temperature of materials A and B is 10-25°C, the stirring speed is 300-350 r / min, and the stirring time is 1-2 min. If the mixing speed is too low, it is not conducive to the uniformity of mixing the AB materials. If the speed is too high, heat will be generated due to the viscosity of the rubber, affecting the foaming effect.

[0011] Compared with the prior art, the present invention has the following beneficial effects: (1) The silicone rubber foam material prepared by the present invention has a base rubber mainly composed of vinyl hydroxy silicone oil and is compounded with 110 raw rubber, which can effectively improve the mechanical properties of the silicone rubber foam; (2) Using different amounts of hydrogenated silicone oil can increase the active cross-linking points, improve the degree of cross-linking, and make the pores uniform and dense; (3) The modified aluminum hydroxide powder used in the present invention has good flame retardant properties. Before aluminum hydroxide is surface treated, it has more surface active hydroxyl groups, which are difficult to disperse and open during use, resulting in performance degradation. The aluminum hydroxide after surface modification will have a lower oil absorption, and its dispersibility is significantly improved compared with the original powder, and the degree of material embrittlement is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The cell structure of the silicone rubber foam material prepared in Example 1; Figure 2 This is the pore structure of the silicone rubber foam material prepared in Comparative Example 1. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments.

[0014] Example 1 Preparation of modified aluminum hydroxide powder: Add a pre-dispersed aluminum hydroxide suspension with a solid content of 20% into the mixer, wherein the suspension is prepared by dispersing 6 kg of aluminum hydroxide powder with a particle size of 1-2 μm in pure water; add 120 g of ethyltriethoxysilane and 900 ml of isopropanol into the mixer in sequence, stir and mix at 80°C for 20 minutes, then take out, with a rotation speed of 500 r / min. Vacuum filter and dry at 50°C for 6 hours to obtain modified aluminum hydroxide powder.

[0015] Preparation of base glue: At 130°C under normal pressure, 11 kg of vinyl hydroxy silicone oil and 2 kg of a specific surface area of ​​300 m 2 / g of fumed silica is added to the kneader in 4 batches for stirring and kneading. Stir for 10-30 minutes after each addition of the material. The stirring time is prolonged as the total amount of the material increases. After all the above materials are added and stirred and mixed evenly, the mixture is kept in a vacuum state for 4 hours to obtain a base rubber; Preparation of silicone rubber foam material: Take 38 parts of the above-prepared base rubber, 26 parts of α,ω-dihydroxy polydimethylsiloxane (viscosity 20000CPS), 0.75 parts of 110-1 raw rubber (vinyl content 1%), 0.75 parts of 110-4 raw rubber (vinyl content 3%), 18 parts of hydroxy silicone oil (hydroxyl content 2.9%), 50 parts of modified aluminum hydroxide powder, 0.7 parts of Custer platinum catalyst, and 1.5 parts of color paste and mix them thoroughly to obtain rubber material A; take 24 parts of the above-prepared base rubber, vinyl-terminated polydimethylsiloxane (viscosity 60000CPS) 42 parts, 110-1 raw rubber (vinyl content 1%) 0.75 parts, 110-4 raw rubber (vinyl content 3%) 0.75 parts, hydrogen-containing silicone oil 1 (hydrogen content 1.55%) 11 parts, hydrogen-containing silicone oil 2 (hydrogen content 0.07%) 6 parts, 50 parts of modified aluminum hydroxide powder, 1 part of ethynyl cyclohexanol, 1.5 parts of color paste were fully mixed to obtain rubber material B. Rubber materials A and B were quickly stirred at room temperature, and the obtained mixture was coated on the release film, and after being rolled by a calender (roller spacing 2mm), it was put into a 70℃ oven for vulcanization for 5min, and then transferred to a 160℃ oven for vulcanization for 30min to obtain a silicone rubber foam material.

[0016] Example 2 Modified aluminum hydroxide powder and base rubber were prepared according to the method described in Example 1. 42 parts of base rubber, 22 parts of α,ω-dihydroxy polydimethylsiloxane (viscosity 20000CPS), 0.75 parts of 110-1 raw rubber (vinyl content 1%), 0.75 parts of 110-4 raw rubber (vinyl content 3%), 16 parts of hydroxy silicone oil (hydroxyl content 2.9%), 66 parts of modified aluminum hydroxide powder, 1 part of Custer platinum catalyst, and 1 part of color paste were fully mixed to obtain rubber material A; 30 parts of the base rubber prepared above ...) 36 parts, 110-1 raw rubber (vinyl content 1%) 0.75 parts, 110-4 raw rubber (vinyl content 3%) 0.75 parts, hydrogen-containing silicone oil 1 (hydrogen content 1.55%) 9.2 parts, hydrogen-containing silicone oil 2 (hydrogen content 0.07%) 5 parts, modified aluminum hydroxide powder 66 parts, ethynyl cyclohexanol 2.1 parts, and color paste 1 part were fully mixed to obtain rubber material B. Rubber materials A and B were quickly stirred at room temperature, and the obtained mixture was coated on a release film, and after being rolled by a calender (roller spacing 2mm), it was put into a 70℃ oven for vulcanization for 5min, and then transferred to a 160℃ oven for vulcanization for 30min to obtain a silicone rubber foam material.

[0017] Example 3 Modified aluminum hydroxide powder and base rubber were prepared according to the method described in Example 1. 42 parts of base rubber, 22 parts of α,ω-dihydroxy polydimethylsiloxane (viscosity 20000CPS), 1 part of 110-1 raw rubber (vinyl content 1%), 0.75 parts of 110-4 raw rubber (vinyl content 3%), 16 parts of hydroxy silicone oil (hydroxyl content 2.9%), 80 parts of modified aluminum hydroxide powder, 1 part of Custer platinum catalyst, and 1.5 parts of color paste were fully mixed to obtain rubber material A; 30 parts of the base rubber prepared above ...60000CPS) 42 parts, 1 part of 110-1 raw rubber (vinyl content 1%), 0.75 parts of 110-4 raw rubber (vinyl content 3%), 19.5 parts of hydrogenated silicone oil 1 (hydrogen content 0.8%), 10.9 parts of hydrogenated silicone oil 2 (hydrogen content 0.28%), 80 parts of modified aluminum hydroxide powder, 2.1 parts of ethynyl cyclohexanol, and 1.5 parts of color paste were fully mixed to obtain rubber material B. Rubber materials A and B were quickly stirred at room temperature, and the obtained mixture was coated on a release film, and after being rolled by a calender (roller spacing 2mm), it was put into a 70℃ oven for vulcanization for 5min, and then transferred to a 160℃ oven for vulcanization for 30min to obtain a silicone rubber foam material.

[0018] Example 4 Preparation of base glue: At 130°C under normal pressure, 10 kg of vinyl hydroxy silicone oil and 2.5 kg of a specific surface area of ​​300 m 2 / g of fumed silica is added to the kneader in 4 batches for stirring and kneading. Stir for 10-30 minutes after each addition of the material. The stirring time is prolonged as the total amount of the material increases. After all the above materials are added and stirred and mixed evenly, the mixture is kept in a vacuum state for 4 hours to obtain a base rubber; Preparation of silicone rubber foam material: Take 35 parts of the above-prepared base rubber, 30 parts of α,ω-dihydroxy polydimethylsiloxane (viscosity 20000CPS), 1 part of 110-1 raw rubber (vinyl content 1%), 0.75 parts of 110-4 raw rubber (vinyl content 3%), 16 parts of hydroxy silicone oil (hydroxyl content 2.9%), 50 parts of modified aluminum hydroxide powder, 1 part of Custer platinum catalyst, and 1 part of color paste and mix them thoroughly to obtain rubber material A; take 20 parts of the above-prepared base rubber, vinyl-terminated polydimethylsiloxane (viscosity 60000CPS) 48 parts, 1 part of 110-1 raw rubber (vinyl content 1%), 0.75 parts of 110-4 raw rubber (vinyl content 3%), 19.5 parts of hydrogenated silicone oil 1 (hydrogen content 0.8%), 10.9 parts of hydrogenated silicone oil 2 (hydrogen content 0.28%), 50 parts of modified aluminum hydroxide powder, 2.1 parts of ethynyl cyclohexanol, and 1 part of color paste were fully mixed to obtain rubber material B. Rubber materials A and B were quickly stirred at room temperature, and the obtained mixture was coated on a release film, and after being rolled by a calender (roller spacing 2mm), it was put into a 60℃ oven for vulcanization for 7min, and then transferred to a 180℃ oven for vulcanization for 30min to obtain a silicone rubber foam material.

[0019] Example 5 Modified aluminum hydroxide powder was prepared according to the method described in Example 1, and base rubber was prepared according to the method described in Example 4. Take 35 parts of base rubber, 30 parts of α,ω-dihydroxy polydimethylsiloxane (viscosity 20000CPS), 0.75 parts of 110-1 raw rubber (vinyl content 1%), 0.75 parts of 110-4 raw rubber (vinyl content 3%), 18 parts of hydroxy silicone oil (hydroxyl content 2.9%), 50 parts of modified aluminum hydroxide powder, 1 part of Custer platinum catalyst, and 1.5 parts of color paste and mix them thoroughly to obtain rubber material A; take 20 parts of the base rubber prepared above, end vinyl polydimethylsiloxane (viscosity 60000CPS) 48 parts, 110-1 raw rubber (vinyl content 1%) 0.75 parts, 110-4 raw rubber (vinyl content 3%) 0.75 parts, hydrogen-containing silicone oil 1 (hydrogen content 1.55%) 11 parts, hydrogen-containing silicone oil 2 (hydrogen content 0.07%) 6 parts, 50 parts of modified aluminum hydroxide powder, 2.1 parts of ethynyl cyclohexanol, 1.5 parts of color paste were fully mixed to obtain rubber material B. Rubber materials A and B were quickly stirred at room temperature, and the obtained mixture was coated on the release film, and after being rolled by a calender (roller spacing 2mm), it was put into a 50℃ oven for vulcanization for 10min, and then transferred to a 180℃ oven for vulcanization for 30min to obtain a silicone rubber foam material.

[0020] Embodiment 6-8 Example 6 refers to the preparation method of Example 2, except that the viscosity of α, ω-dihydroxypolydimethylsiloxane is 50,000 CPS; Example 7 refers to the preparation method of Example 3, except that the viscosity of α, ω-dihydroxypolydimethylsiloxane is 50,000 CPS; Example 8 refers to the preparation method of Example 3, except that the viscosity of α, ω-dihydroxypolydimethylsiloxane is 80,000 CPS.

[0021] Comparative Example 1 The silicone rubber foam material was prepared according to the method described in Example 1, except that the base rubber was prepared using the following process: 5.5 kg of vinyl polydimethylsiloxane with a vinyl content of 4% and 5.5 kg of α,ω-dihydroxy polydimethylsiloxane with a hydroxyl value of 4% and 2 kg of a specific surface area of ​​300 m 2 / g of fumed silica was added into a kneader in 4 batches for stirring and kneading. After each addition, the material was stirred for 10-30 minutes, and the stirring time was prolonged as the total amount of the material increased. After all the above materials were added and stirred and mixed evenly, the mixture was kept in a vacuum state for 4 hours to obtain a base rubber.

[0022] Comparative Example 2 The silicone rubber foam material was prepared according to the method described in Example 1, except that unmodified aluminum hydroxide powder was used.

[0023] Comparative Example 3 The silicone rubber foam material was prepared according to the method described in Example 1, except that aluminum hydroxide powder modified with cycloethoxyethyltriethoxysilane was used.

[0024] Comparative Example 4 The silicone rubber foam material was prepared according to the method described in Example 1, except that aluminum hydroxide powder modified with vinyltriethoxysilane was used.

[0025] Comparative Example 5 The silicone rubber foam material was prepared according to the method described in Example 1, except that the aluminum hydroxide powder was replaced with magnesium hydroxide to prepare the modified powder.

[0026] Comparative Example 6 The silicone rubber foam material was prepared according to the method described in Example 1, except that 1.5 parts of 110-4 raw rubber (vinyl content 3%) was used in the preparation of rubber materials A and B, and 110-1 raw rubber was not used.

[0027] The experimental test results of each group are shown in Table 1.

[0028] Table 1 Performance test results of examples and comparative examples <![CDATA[Density (kg / m 3 ).]]> 25% compressive stress (KPa) Tensile strength (MPa) Elongation at break (%) Flame retardant grade Example 1 395 115 0.55 168 V-0 Example 2 407 119 0.57 164 V-0 Example 3 415 121 0.59 178 V-0 Example 4 404 133 0.56 168 V-0 Example 5 405 116 0.57 171 V-0 Example 6 413 125 0.59 176 V-0 Example 7 422 120 0.58 172 V-0 Example 8 420 118 0.57 173 V-0 Comparative Example 1 393 99 0.39 113 V-0 Comparative Example 2 358 77 0.37 93 V-1 Comparative Example 3 423 89 0.37 88 V-1 Comparative Example 4 430 102 0.43 116 V-0 Comparative Example 5 410 96 0.40 140 V-1 Comparative Example 6 383 87 0.40 121 V-0 Note: Density is measured with reference to "GB / T 6343-1995 Determination of apparent (volume) density of cellular plastics and rubber", instrument model: MH-300A.

[0029] The 25% compressive stress is measured according to "ASTM D1056 Standard Specification for Tough Porous Materials", and the tensile strength and elongation at break are measured according to "ASTM D412 Standard Test Method for Tensile Properties of Vulcanized Rubber and Thermoplastic Elastomers", instrument model: AI-7000-SU1.

[0030] The flame retardant grade is measured according to the "UL94 horizontal vertical burning test method", instrument model: HVUL2.

[0031] According to the results in Table 1, it can be seen that compared with Example 1, although the base rubber of Comparative Example 1 uses vinyl polydimethylsiloxane and α,ω-dihydroxy polydimethylsiloxane with the same total weight and the same vinyl and hydroxyl content, its mechanical properties and pore structure are inferior to those of Example 1. Compared with Example 1, the modified aluminum hydroxide powder of Comparative Examples 2-3 can improve its dispersibility in the rubber material, reduce the embrittlement degree of the material, and enhance the mechanical strength. Comparative Examples 4-5 use modifiers containing different functional groups. The results show that when the modifier is ethyltriethoxysilane, the silicone rubber foam material has good mechanical properties and flame retardancy. In summary, the silicone rubber foam material prepared according to the method of the present invention has better mechanical properties and flame retardancy than Comparative Examples 1-6 as a whole.

[0032] The above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A silicone rubber foam material, characterized in that: It includes two components, A and B; Component A, calculated by mass, includes 35-45 parts of base rubber, 20-30 parts of α,ω-dihydroxy polydimethylsiloxane, 0.5-2 parts of 110 raw rubber, 10-20 parts of hydroxy silicone oil, 50-80 parts of modified aluminum hydroxide powder, and 0.5-2 parts of platinum catalyst; Component B, calculated by mass, includes 20-35 parts of base rubber, 30-50 parts of vinyl-terminated polydimethylsiloxane, 0.5-2 parts of 110 raw rubber, 10-35 parts of hydrogenated silicone oil, 50-80 parts of modified aluminum hydroxide powder, and 1-3 parts of inhibitor; The base rubber contains 80-85% by mass of vinyl hydroxy silicone oil and 15-20% by mass of fumed silica.

2. The silicone rubber foam material according to claim 1, characterized in that: The vinyl hydroxy silicone oil has a hydroxyl content of 4-9% and a vinyl content of 3-9%; The specific surface area of ​​the fumed silica is 200-380 m 2 / g; the viscosity of the α,ω-dihydroxy polydimethylsiloxane is 10000-100000cps; The viscosity of the vinyl-terminated polydimethylsiloxane is 10000-100000 cps; the 110 raw rubber is 110-1 with a vinyl content of 1% and / or 110-4 with a vinyl content of 3%; The hydroxyl content of the hydroxy silicone oil is 0.7-5%, and the viscosity is 5-100 cps; The hydrogen-containing silicone oil is selected from hydrogen-containing silicone oil 1 and hydrogen-containing silicone oil 2, the mass ratio of hydrogen-containing silicone oil 1 to hydrogen-containing silicone oil 2 is 1-3:1, the hydrogen content of hydrogen-containing silicone oil 1 is 0.8-1.6%, and the hydrogen content of hydrogen-containing silicone oil 2 is 0.07-0.28%; The modified aluminum hydroxide is prepared by modifying aluminum hydroxide with a particle size of 1-5 μm and ethyltriethoxysilane.

3. The silicone rubber foam material according to claim 2, characterized in that: The vinyl hydroxy silicone oil has a hydroxyl content of 3.5-4.5% and a vinyl content of 3.5-4.5%; The specific surface area of ​​the fumed silica is 300-380 m 2 / g; The viscosity of the α,ω-dihydroxy polydimethylsiloxane is 20000-80000cps; the viscosity of the vinyl-terminated polydimethylsiloxane is 20000-60000cps; the content of hydroxyl in the hydroxy silicone oil is 2-4%, and the viscosity is 25-50cps; The mass ratio of the hydrogen-containing silicone oil 1 to the hydrogen-containing silicone oil 2 is 1.7-1.9:1; the particle size of the aluminum hydroxide is 1-2 μm; The platinum catalyst is a Custer platinum catalyst; the inhibitor is selected from at least one of 2-methyl-3-alkyn-2-ol, 3-methyl-1-alkyn-3-ol, and ethynyl cyclohexanol.

4. The method for preparing the silicone rubber foam material according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Preparation of modified aluminum hydroxide: Add a pre-dispersed aluminum hydroxide suspension with a solid content of 15-30% into a mixer, wherein the suspension solvent is pure water, and add ethyltriethoxysilane and isopropanol to the mixer in sequence, stir and mix under heating conditions, take out, vacuum filter and dry to obtain modified aluminum hydroxide powder; Preparation of base rubber: Add vinyl hydroxy silicone oil and fumed silica in batches into a kneader at normal pressure of 120-140°C for kneading, stir for 10-30 minutes after each addition, and keep the stirred materials under vacuum for 3-5 hours to obtain base rubber; (2) 35-45 parts of base rubber, 20-30 parts of α,ω-dihydroxy polydimethylsiloxane, 0.5-2 parts of 110 raw rubber, 10-20 parts of hydroxy silicone oil, 50-80 parts of modified aluminum hydroxide powder, and 0.5-2 parts of platinum catalyst are stirred and mixed uniformly to obtain material A; (3) Stir and mix 20-35 parts of base rubber, 30-50 parts of vinyl-terminated polydimethylsiloxane, 0.5-2 parts of 110 raw rubber, 10-35 parts of hydrogenated silicone oil, 50-80 parts of modified aluminum hydroxide powder, and 1-3 parts of inhibitor to obtain material B; (4) Weigh equal masses of material A and material B, stir them quickly at room temperature, coat the resulting mixture on a pre-prepared release film, and vulcanize them in two stages in an oven after passing through a calender set to the required height. The first stage vulcanization temperature is 50-70°C for 5-10 minutes, and the second stage vulcanization temperature is 150-180°C for 30-40 minutes.

5. The method for preparing the silicone rubber foam material according to claim 4, characterized in that: The base rubber contains 80-85% by mass of vinyl hydroxy silicone oil and 15-20% by mass of fumed silica.

6. The method for preparing the silicone rubber foam material according to claim 4 or 5, characterized in that: The vinyl hydroxy silicone oil has a hydroxyl content of 4-9% and a vinyl content of 3-9%; the specific surface area of ​​the fumed silica is 200-380m 2 / g; The viscosity of the α,ω-dihydroxy polydimethylsiloxane is 10000-100000cps; the viscosity of the vinyl-terminated polydimethylsiloxane is 10000-100000cps; the 110 raw rubber is 110-1 with a vinyl content of 1% and / or 110-4 with a vinyl content of 3%; the hydroxyl content of the hydroxy silicone oil is 0.7-5%, and the viscosity is 5-100cps; The hydrogen-containing silicone oil is selected from hydrogen-containing silicone oil 1 and hydrogen-containing silicone oil 2, the mass ratio of hydrogen-containing silicone oil 1 to hydrogen-containing silicone oil 2 is 1-3:1, the hydrogen content of hydrogen-containing silicone oil 1 is 0.8-1.6%, and the hydrogen content of hydrogen-containing silicone oil 2 is 0.07-0.28%; the modified aluminum hydroxide is prepared by modifying aluminum hydroxide with a particle size of 1-5 μm.

7. The method for preparing the silicone rubber foam material according to claim 6, characterized in that: The vinyl hydroxy silicone oil has a hydroxyl content of 3.5-4.5% and a vinyl content of 3.5-4.5%; the specific surface area of ​​the fumed silica is 300-380m 2 / g; The viscosity of the α,ω-dihydroxy polydimethylsiloxane is 20000-80000cps; the viscosity of the vinyl-terminated polydimethylsiloxane is 20000-60000cps; The hydroxyl content of the hydroxy silicone oil is 2-4%, and the viscosity is 25-50cps; the mass ratio of the hydrogen-containing silicone oil 1 to the hydrogen-containing silicone oil 2 is 1.7-1.9:1; and the particle size of the aluminum hydroxide is 1-2μm.

8. The method for preparing the silicone rubber foam material according to claim 4, characterized in that: The platinum catalyst is a Custer platinum catalyst; the inhibitor is selected from at least one of 2-methyl-3-alkyn-2-ol, 3-methyl-1-alkyn-3-ol, and ethynyl cyclohexanol.

9. The method for preparing the silicone rubber foam material according to claim 4, characterized in that: In step (1), the mass volume ratio of ethyltriethoxysilane to isopropanol is 1:5-10 g / ml, preferably 1:7-9 g / ml, the mass ratio of ethyltriethoxysilane to aluminum hydroxide is 45-55:1, the heating temperature is 70-90°C, the drying temperature is 50-60°C, and the stirring speed of the base glue is 80-150 r / min, preferably 100-120 r / min; in steps (2) and (3), the stirring and dispersing time of components A and B is 10-120 min, the dispersing speed is 400-600 r / min, and the stirring speed is 30-50 r / min; in step (4), the mixing temperature of materials A and B is 10-25°C, the stirring speed is 300-350 r / min, and the stirring time is 1-2 min.

10. Use of the silicone rubber foam material according to any one of claims 1 to 3 or the silicone rubber foam material prepared by the preparation method according to any one of claims 4 to 9 in the preparation of new energy battery materials.

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