Two-component foamed silicone rubber as well as preparation method and application thereof

Abstract

The invention provides two-component foamed silicone rubber. The two-component foamed silicone rubber comprises a component A and a component B, the component A is prepared from the following raw materials: first base rubber, a first reinforcing agent, a first surface treating agent, first hydroxyl polysiloxane, an alcohol compound, a platinum complex catalyst and a first flame retardant; the component B is prepared from the following raw materials: second base rubber, a second reinforcing agent, a second surface treating agent, second hydroxyl polysiloxane, a filling agent, vinyl-terminated silicone oil, hydrogen-containing silicone oil, a cross-linking agent and a second flame retardant; the first base rubber and the second base rubber are both vinyl silicone oil, and the viscosity of the first base rubber and the second base rubber at 25 DEG C is 1000-8000 MPa.s. On the basis of the system, by controlling the viscosity of the vinyl silicone oil, the foamed silicone rubber with a proper cell diameter can be obtained, and the cell uniformity of the material is improved, so that the foamed silicone rubber has a relatively low heat conductivity coefficient and relatively excellent mechanical properties. In addition, the invention also provides a preparation method and application of the two-component foamed silicone rubber.

Description

Technical Field

[0001] This invention relates to the field of foamed silicone rubber materials technology, specifically to a two-component foamed silicone rubber, its preparation method, and its application. Background Technology

[0002] Foamed silicone rubber, as a new type of flexible, porous polymer elastomer, is produced through a silicone rubber foaming process, combining the advantages of both silicone rubber and foam materials. This material has been widely used in many high-end fields such as defense, aerospace, transportation, and the electronics industry due to its excellent damping, vibration reduction, sound insulation, and heat insulation properties.

[0003] Existing technology discloses a high-resilience flame-retardant silicone rubber foam and its preparation method. This involves reacting hydroxyl-terminated polydimethylsiloxane, vinyl silicone oil, hydrogen-containing silicone oil, and small-molecule hydroxyl silicone oil under the action of a platinum catalyst to obtain a uniformly foamed flame-retardant silicone rubber foam with good compression set resistance and resilience. Existing technology also discloses a foamed silicone rubber, its preparation method, and its applications. This involves the reaction of vinyl silicone oil and hydrogen-containing silicone oil to generate hydrogen gas and alcohol compounds, which together form bubbles. This results in a foamed silicone rubber with a high foaming rate (4-10 times) and low density (apparent density 0.12-0.23 g / cm³). 3 It has small pore size, ranging from 250 to 500 μm; high mechanical strength; and features an open-pore structure.

[0004] However, when the foamed silicone rubber mentioned above is applied to power batteries, it is still difficult to solve the problems of low thermal conductivity while simultaneously meeting flame retardancy and mechanical requirements. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention solves the technical problem of providing a two-component foamed silicone rubber and its preparation method, which can effectively reduce the thermal conductivity while taking into account flame retardancy and mechanical requirements.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a two-component foamed silicone rubber, wherein the two-component foamed silicone rubber comprises a component A and a component B; the raw materials for preparing the component A include: a first base rubber, a first reinforcing agent, a first surface treatment agent, a first hydroxyl polysiloxane, an alcohol compound, a platinum complex catalyst, and a first flame retardant; the raw materials for preparing the component B include: a second base rubber, a second reinforcing agent, a second surface treatment agent, a second hydroxyl polysiloxane, a filler, a vinyl-terminated silicone oil, a hydrogen-containing silicone oil, a crosslinking agent, and a second flame retardant; Both the first base adhesive and the second base adhesive are vinyl silicone oils, and the viscosity of the first base adhesive and the second base adhesive at 25°C is 1000-8000 MPa·s.

[0007] Preferably, by weight, the raw materials for preparing component A include: 30-50 parts of the first base adhesive, 10-20 parts of the first reinforcing agent, 1-7 parts of the first surface treatment agent, 10-40 parts of the first hydroxyl polysiloxane, 2-8 parts of alcohol compounds, 0.1-0.4 parts of platinum complex catalyst, and 15-20 parts of the first flame retardant; Preferably, by weight, the raw materials for preparing component B include: 5-15 parts of the second base adhesive, 1-10 parts of the second reinforcing agent, 0.1-5 parts of the second surface treatment agent, 5-15 parts of the second hydroxyl polysiloxane, 15-25 parts of the filler, 5-10 parts of the vinyl-terminated silicone oil, 40-50 parts of the hydrogen-containing silicone oil, 0.1-0.5 parts of the crosslinking agent, and 5-15 parts of the second flame retardant.

[0008] Preferably, the first reinforcing agent and the second reinforcing agent are selected from fumed silica or fumed silicon dioxide.

[0009] Preferably, the specific surface area of ​​both the first reinforcing agent and the second reinforcing agent is 300-400 m². 2 / g.

[0010] Preferably, the first and second surface treatment agents are selected from hexamethyldisilazane or methyldiethoxysilane.

[0011] Preferably, the hydrogen content of the hydrogen-containing silicone oil is 1.3-1.6 wt%.

[0012] Preferably, the particle size of both the first flame retardant and the second flame retardant is 6-10 μm.

[0013] Secondly, the present invention also provides a method for preparing two-component foamed silicone rubber, the method comprising the following steps: Preparation of Component A: The first base adhesive, the first reinforcing agent, and the first surface treatment are heated and kneaded, then vacuumed, cooled, and sealed for storage to obtain the first mixture; Component A is obtained by mixing the first mixture, the first hydroxyl polysiloxane, the first flame retardant, the platinum complex catalyst, and the alcohol compound evenly. Preparation of Component B: The second base adhesive, the second reinforcing agent, and the second surface treatment agent are heated and kneaded, then vacuumed, cooled, and sealed to obtain the second mixture; Component B is obtained by uniformly mixing the second mixture, the second hydroxyl polysiloxane, the filler, the vinyl-terminated silicone oil, the hydrogen-containing silicone oil, the crosslinking agent, and the second flame retardant. The preparation of the two-component foamed silicone rubber is as follows: Component A and Component B are mixed in a certain mass ratio, and the mixture is calendered, cured, vulcanized twice, and wound up to obtain the two-component foamed silicone rubber.

[0014] Thirdly, the present invention also provides an application of the aforementioned two-component foamed silicone rubber in power batteries.

[0015] Compared with the prior art, the advantages of the present invention are as follows: (1) Based on the above system of the present invention, by controlling the viscosity of vinyl silicone oil, foamed silicone rubber with a suitable cell diameter can be obtained, thereby improving the uniformity of the cell structure of the material and thus giving the foamed silicone rubber a lower thermal conductivity and better mechanical properties. (2) In this invention, hexamethyldisilazane is used to treat the surface of silica, while controlling the specific surface area of ​​silica to be 300-400 m². 2 / g can improve the elongation at break of foamed silicone rubber while maintaining good thermal insulation properties; (3) By controlling the hydrogen content and the amount of hydrogen-containing silicone oil, the present invention can obtain foamed silicone rubber with low density and low thermal conductivity. (4) By controlling the particle size range of the first flame retardant and the second flame retardant, the present invention can improve the compatibility of the first flame retardant and the second flame retardant with silicone rubber. The first flame retardant and the second flame retardant have suitable specific surface areas, which can control the binding force on the foam cells, so that the foamed material will form a larger foam cell structure during foaming, reduce the density of the material, and improve the heat insulation performance. (5) The preparation method of the two-component foamed silicone rubber provided by the present invention has a simple preparation process, can achieve uniformity of foamed silicone rubber cells, and reduce production costs. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] This invention provides a two-component foamed silicone rubber and its preparation method, which can effectively reduce the thermal conductivity of the foamed silicone rubber, enabling it to simultaneously meet flame retardancy and mechanical requirements, and thus be applied to power batteries. This solves the problem that existing foamed silicone rubber still struggles to achieve low thermal conductivity while simultaneously meeting flame retardancy and mechanical requirements when applied to power batteries.

[0018] To achieve the above-mentioned technical effects, the overall concept of this invention is as follows: In a first aspect, the present invention provides a two-component foamed silicone rubber, the two-component foamed silicone rubber comprising component A and component B; the raw materials for preparing component A include: a first base rubber, a first reinforcing agent, a first surface treatment agent, a first hydroxyl polysiloxane, an alcohol compound, a platinum complex catalyst, and a first flame retardant; the raw materials for preparing component B include: a second base rubber, a second reinforcing agent, a second surface treatment agent, a second hydroxyl polysiloxane, a filler, a vinyl-terminated silicone oil, a hydrogen-containing silicone oil, a crosslinking agent, and a second flame retardant; Both the first base adhesive and the second base adhesive are vinyl silicone oils, and the viscosity of the first base adhesive and the second base adhesive at 25°C is 1000-8000 MPa·s.

[0019] Based on the above system of the present invention, by controlling the viscosity range of vinyl silicone oil to 1000-8000 MPa·s, foamed silicone rubber with suitable cell diameter can be obtained, improving the uniformity of cell structure in the material, thereby giving the foamed silicone rubber a lower thermal conductivity and better mechanical properties.

[0020] The vinyl groups in the vinyl silicone oil used in this invention can provide more active groups to the foamed silicone rubber system, thereby improving the crosslinking efficiency and increasing the crosslinking density of the system. During the experiment, the applicant found that selecting a vinyl silicone oil with a viscosity range of 1000-8000 MPa·s in the system of this invention can not only improve the compressive stress and elongation at break of the foamed silicone rubber, but also further reduce its thermal conductivity. The applicant analyzes that the possible reason is that the higher the viscosity of the vinyl silicone oil, the greater the foaming coefficient of the foamed silicone rubber, the smaller the cell size of the foam, and the less air contained in the unit volume of material, resulting in a significant increase in the thermal conductivity and a decrease in fluidity, but a decrease in the hardness of the material and an increase in the elongation at break. However, when the viscosity of the vinyl silicone oil is in the range of 1000-8000 MPa·s, foamed silicone rubber with a suitable cell diameter can be prepared, balancing the thermal conductivity and mechanical properties of the foamed silicone rubber, so that the foamed silicone rubber has a low thermal conductivity while ensuring that the mechanical properties meet the usage conditions.

[0021] Preferably, the first base adhesive and the second base adhesive have the same viscosity at 25°C. Experiments show that the closer the viscosities of the first and second base adhesives are, the higher the uniformity of the cell structure in the resulting material, leading to a lower thermal conductivity and superior mechanical properties.

[0022] Preferably, by weight, the raw materials for preparing component A include: 30-50 parts of the first base adhesive, 10-20 parts of the first reinforcing agent, 1-7 parts of the first surface treatment agent, 10-40 parts of the first hydroxyl polysiloxane, 2-8 parts of alcohol compounds, 0.1-0.4 parts of platinum complex catalyst, and 15-20 parts of the first flame retardant; Preferably, by weight, the raw materials for preparing component B include: 5-15 parts of the second base adhesive, 1-10 parts of the second reinforcing agent, 0.1-5 parts of the second surface treatment agent, 5-15 parts of the second hydroxyl polysiloxane, 15-25 parts of the filler, 5-10 parts of the vinyl-terminated silicone oil, 40-50 parts of the hydrogen-containing silicone oil, 0.1-0.5 parts of the crosslinking agent, and 5-15 parts of the second flame retardant.

[0023] Preferably, the first reinforcing agent and the second reinforcing agent are selected from fumed silica or fumed silicon dioxide.

[0024] Preferably, the specific surface area of ​​both the first reinforcing agent and the second reinforcing agent is 300-400 m². 2 / g. In a more preferred embodiment, the specific surface area of ​​both the first reinforcing agent and the second reinforcing agent is 380m². 2 / g.

[0025] Preferably, the first surface treatment agent and the second surface treatment agent are selected from one or more of hexamethyldisilazane, dimethyldichlorosilane and octamethylcyclotetrasiloxane.

[0026] The applicant has demonstrated through extensive testing that using hexamethyldisilazane for surface treatment of silica, while controlling the specific surface area of ​​silica to be 300-400 m², is effective. 2 / g can improve the elongation at break of foamed silicone rubber while maintaining good thermal insulation performance.

[0027] Preferably, the hydrogen content of the hydrogen-containing silicone oil is 1.3-1.6 wt%. The applicant has demonstrated through extensive testing that low-density, low-thermal-conductivity foamed silicone rubber can be obtained by controlling the hydrogen content and amount of hydrogen-containing silicone oil. In a preferred embodiment, the hydrogen content of the hydrogen-containing silicone oil is any one of 1.3 wt%, 1.4 wt%, 1.5 wt%, and 1.6 wt%.

[0028] Preferably, the average particle size of both the first flame retardant and the second flame retardant is 6-10 μm, and the specific surface area of ​​both is 250-450 m². 2 / g.

[0029] Preferably, the first flame retardant and the second flame retardant are selected from one or more of aluminum hydroxide, magnesium hydroxide, and antimony trioxide. In a most preferred embodiment, both the first flame retardant and the second flame retardant are aluminum hydroxide.

[0030] The applicant has demonstrated through extensive testing that by controlling the particle size range of aluminum hydroxide to 6-10 μm, the first and second flame retardants have good compatibility with silicone rubber. Aluminum hydroxide has a suitable specific surface area, which can control the binding force on the foam cells, allowing the foamed material to form a larger foam cell structure during foaming, reducing the density of the material and resulting in excellent thermal insulation performance.

[0031] Preferably, both the first hydroxyl polysiloxane and the second hydroxyl polysiloxane are selected from one or more of 107 glue (α,ω-dihydroxy polydimethylsiloxane), vinyl hydroxyl silicone oil, hydroxyl-terminated hydrogen-containing polysiloxane, and hydroxyl polymethyl vinyl siloxane.

[0032] Preferably, the viscosity of the first hydroxyl polysiloxane is 500~800 MPa·s; and the viscosity of the second hydroxyl polysiloxane is 200~400 MPa·s.

[0033] Preferably, the alcohol compound is selected from one or more of n-butanol, n-hexanol, and n-octanol.

[0034] Preferably, when the alcohol compound is a mixture of n-butanol and n-hexanol, the mass ratio of n-butanol to n-hexanol is (1-3):3. In some more preferred embodiments, the mass ratio of n-butanol to n-hexanol is any one of 1:3, 2:3, or 1:1.

[0035] Preferably, the platinum complex catalyst is selected from chloroplatinic vinylsiloxane chelate or chloroplatinic alcohol solution.

[0036] Preferably, the filler is selected from one or more of diatomaceous earth, calcium carbonate, and silicon dioxide, and the particle size of the filler is 2000-3000 mesh. In some preferred embodiments, the particle size of the filler is 2500 mesh.

[0037] Preferably, the viscosity of the vinyl-terminated silicone oil is 200~500 MPa·s.

[0038] Preferably, the crosslinking agent is tetravinyltetramethylcyclotetrasiloxane.

[0039] Preferably, the mass ratio of component A to component B is 1:(1~3); in some more preferred embodiments, the mass ratio of component A to component B is 1:1.

[0040] Secondly, embodiments of the present invention also provide a method for preparing two-component foamed silicone rubber, the method comprising the following steps: Preparation of Component A: The first base adhesive, the first reinforcing agent, and the first surface treatment are heated and kneaded, then vacuumed, cooled, and sealed for storage to obtain the first mixture; Component A is obtained by mixing the first mixture, the first hydroxyl polysiloxane, the first flame retardant, the platinum complex catalyst, and the alcohol compound evenly. Preparation of Component B: The second base adhesive, the second reinforcing agent, and the second surface treatment agent are heated and kneaded, then vacuumed, cooled, and sealed to obtain the second mixture; Component B is obtained by uniformly mixing the second mixture, the second hydroxyl polysiloxane, the filler, the vinyl-terminated silicone oil, the hydrogen-containing silicone oil, the crosslinking agent, and the second flame retardant. Wherein, both the first base adhesive and the second base adhesive are vinyl silicone oils, and the viscosity of the first base adhesive and the second base adhesive at 25°C is 1000-8000 MPa·s; The preparation of the two-component foamed silicone rubber is as follows: Component A and Component B are mixed in a certain mass ratio, and the mixture is calendered, cured, vulcanized twice, and wound up to obtain the two-component foamed silicone rubber.

[0041] Based on the system described above in this invention, by controlling the viscosity range of the vinyl silicone oil to 1000-8000 MPa·s, foamed silicone rubber with suitable cell diameter can be obtained, improving the uniformity of the material's cell structure. This results in foamed silicone rubber possessing a lower thermal conductivity and superior mechanical properties. Simultaneously, the preparation method for the two-component foamed silicone rubber provided by this invention is simple, achieves uniform cell structure in the foamed silicone rubber, and reduces production costs.

[0042] Preferably, the kneading temperature of the first base adhesive, the first reinforcing agent, and the first surface treatment is 100-200℃, and the kneading time is 2-3 hours.

[0043] Preferably, in the above steps, the conditions for vacuuming are: vacuum degree -0.1MPa and temperature 150℃.

[0044] Preferably, in the above steps, vacuuming and cooling specifically means cooling to below 40°C.

[0045] Preferably, the specific steps for uniformly mixing the first mixture, the first hydroxy polysiloxane, the first flame retardant, the platinum complex catalyst, and the alcohol compound are as follows: stirring the first mixture, the first hydroxy polysiloxane, and the first flame retardant at a temperature of 35-40°C for 50-70 minutes, then sequentially adding the platinum complex catalyst and the alcohol compound and stirring at room temperature for 50-70 minutes. Preferably, the kneading temperature of the second base adhesive, the second reinforcing agent, and the second surface treatment agent is 100~200℃, and the kneading time is 1~3h.

[0046] Preferably, the storage conditions for the first mixture are: vacuum sealing. The vacuum level is -0.2 to -0.1 MPa, and the sealing temperature is 100 to 200°C. Preferably, the specific steps for uniformly mixing the second mixture, the second hydroxyl polysiloxane, the filler, the terminal vinyl silicone oil, the hydrogen-containing silicone oil, the crosslinking agent, and the second flame retardant are as follows: the second mixture, the second hydroxyl polysiloxane, the filler, the terminal vinyl silicone oil, the hydrogen-containing silicone oil, the crosslinking agent, and the second flame retardant are stirred at a temperature controlled within 35~40°C for 100~200 min.

[0047] Preferably, the mass ratio of component A to component B is 1:(1~3); in some more preferred embodiments, the mass ratio of component A to component B is 1:1.

[0048] Preferably, the calendering step specifically includes: mixing component A and component B in a mass ratio and transferring the mixture to a pressing machine, then calendering it into shape in a calendering machine covered with a release film.

[0049] Preferably, the specific curing steps include: sending the calendered mixture into a drying tunnel at 100~120℃ for curing for 10~20 minutes, and obtaining a pre-cured silicone rubber foam material after curing.

[0050] Preferably, the specific steps of the secondary vulcanization include: placing the pre-vulcanized silicone rubber foam material into an oven at 180~200℃ for secondary vulcanization, and the secondary vulcanization time is 60~120min.

[0051] Thirdly, this invention provides an application of two-component foamed silicone rubber in power batteries. Specifically, the two-component foamed silicone rubber is used to prepare sealing strips for power batteries.

[0052] The two-component foamed silicone rubber made from the above-mentioned raw materials has a low thermal conductivity, superior flame retardancy and mechanical properties, and can be well used in power batteries to meet the flame retardancy and mechanical requirements of power batteries.

[0053] The following specific embodiments illustrate a two-component foamed silicone rubber and its preparation method according to the present invention.

[0054] Example 1 Example 1 provides a two-component foamed silicone rubber, comprising: component A and component B; by weight, the raw materials for preparing component A include: 34.2 parts of first base rubber, 16.4 parts of first reinforcing agent, 5.33 parts of first surface treatment agent, 19.1 parts of first hydroxyl polysiloxane, 6 parts of alcohol compound, 0.3 parts of platinum complex catalyst, and 19 parts of first flame retardant; the raw materials for preparing component B include: 10.06 parts of second base rubber, 5.03 parts of second reinforcing agent, 1.51 parts of second surface treatment agent, 7.4 parts of second hydroxyl polysiloxane, 22.2 parts of filler, 5.5 parts of vinyl-terminated silicone oil, 40.6 parts of hydrogen-containing silicone oil, 0.15 parts of crosslinking agent, and 7.4 parts of second flame retardant.

[0055] The first base adhesive and the second base adhesive are both vinyl silicone oils, and the viscosity of both the first base adhesive and the second base adhesive is 5000 MPa·s at 25°C.

[0056] The hydrogen content of the hydrogen-containing silicone oil is 1.6 wt%.

[0057] Both the first reinforcing agent and the second reinforcing agent are fumed silica produced by fumed silica production, and both have a specific surface area of ​​380 m². 2 / g.

[0058] Both the first and second surface treatment agents are hexamethyldisilazane.

[0059] Both the first hydroxyl polysiloxane and the second hydroxyl polysiloxane are 107 adhesives.

[0060] The viscosity of the first hydroxyl polysiloxane at 25°C is 600 MPa·s; the viscosity of the second hydroxyl polysiloxane at 25°C is 300 MPa·s.

[0061] The alcohol compound is a mixture of n-butanol and n-hexanol, with a mass ratio of n-butanol to n-hexanol of 1:1.

[0062] The platinum complex catalyst is a vinylsiloxane chloroplatinate chelate.

[0063] Both the first and second flame retardants are aluminum hydroxide, with an average particle size of 8 μm and a specific surface area of ​​250–450 m². 2 / g.

[0064] The filler is diatomaceous earth, and the particle size of the diatomaceous earth is 2500 mesh.

[0065] The vinyl-terminated silicone oil has a viscosity of 300 MPa·s at 25°C; the crosslinking agent is tetravinyltetramethylcyclotetrasiloxane.

[0066] The mass ratio of component A to component B is 1:1.

[0067] The preparation method of the two-component foamed silicone rubber in Example 1 is as follows: Preparation of S1 and A components: The first base adhesive, the first reinforcing agent, and the first surface treatment agent are kneaded and mixed while being heated to 150°C for 2 hours. Then, the mixture is evacuated to -0.1 MPa and 150°C, cooled to below 40°C, and sealed to obtain the first mixture. The first mixture, the first hydroxyl polysiloxane, and the first flame retardant are stirred at a temperature below 40°C for 60 minutes. Then, the platinum complex catalyst and the alcohol compound are added sequentially and stirred at room temperature (below 35°C) for 50 minutes to obtain the final product. Preparation of components S2 and B: The second base adhesive, the second reinforcing agent, and the second surface treatment agent are kneaded and mixed together while being heated to 150°C for 2 hours. Then, the mixture is vacuumed to -0.1 MPa and 150°C, and sealed for storage to obtain the second mixture. The second mixture, the second hydroxyl polysiloxane, the filler, the vinyl-terminated silicone oil, the hydrogen-containing silicone oil, the crosslinking agent, and the second flame retardant are mixed at a temperature below 40°C for 120 minutes to obtain the final product. S3. Preparation of foamed silicone rubber: Mix components A and B in the mass ratio and transfer to a press. Calender the mixture into a calender covered with a release film. Then, place it in a 110°C drying tunnel and cure for 10 minutes. Peel off the release films on both sides to obtain a pre-cured silicone foam material. Place it in a 190°C drying tunnel for secondary curing for 90 minutes. Then, roll it up to obtain foamed silicone rubber.

[0068] Example 2 Example 2 provides a two-component foamed silicone rubber, comprising: component A and component B; by weight, the raw materials for preparing component A include: 40.45 parts of first base rubber, 16.18 parts of first reinforcing agent, 2.02 parts of first surface treatment agent, 17.6 parts of first hydroxyl polysiloxane, 5.87 parts of alcohol compound, 0.29 parts of platinum complex catalyst, and 18 parts of first flame retardant; the raw materials for preparing component B include: 11 parts of second base rubber, 2.5 parts of second reinforcing agent, 0.4 parts of second surface treatment agent, 11 parts of second hydroxyl polysiloxane, 22 parts of filler, 6 parts of vinyl-terminated silicone oil, 40 parts of hydrogen-containing silicone oil, 0.2 parts of crosslinking agent, and 11 parts of second flame retardant.

[0069] The first base adhesive and the second base adhesive are both vinyl silicone oils. The viscosity of the first base adhesive at 25°C is 3000 MPa·s, and the viscosity of the second base adhesive at 25°C is 4000 MPa·s.

[0070] The hydrogen content of the hydrogen-containing silicone oil is 1.6 wt%.

[0071] Both the first reinforcing agent and the second reinforcing agent are fumed silica produced by fumed silica production, and both have a specific surface area of ​​300 m². 2 / g.

[0072] Both the first and second surface treatment agents are hexamethyldisilazane.

[0073] Both the first hydroxyl polysiloxane and the second hydroxyl polysiloxane are 107 adhesives.

[0074] The viscosity of the first hydroxyl polysiloxane at 25°C is 600 MPa·s; the viscosity of the second hydroxyl polysiloxane at 25°C is 300 MPa·s.

[0075] The alcohol compound is a mixture of n-octanol and n-hexanol, with a mass ratio of n-octanol to n-hexanol of 1:1.

[0076] The platinum complex catalyst is a vinylsiloxane chloroplatinate chelate.

[0077] Both the first and second flame retardants are aluminum hydroxide, with an average particle size of 8 μm and a specific surface area of ​​250–450 m². 2 / g.

[0078] The filler is diatomaceous earth, and the particle size of the diatomaceous earth is 2500 mesh.

[0079] The vinyl-terminated silicone oil has a viscosity of 400 MPa·s at 25°C; the crosslinking agent is tetravinyltetramethylcyclotetrasiloxane.

[0080] The mass ratio of component A to component B is 1:1.

[0081] Example 2 was prepared using the same preparation method as Example 1.

[0082] Example 3 Example 3 provides a two-component foamed silicone rubber, comprising: component A and component B; by weight, the raw materials for preparing component A include: 36 parts of first base rubber, 17.78 parts of first reinforcing agent, 5.34 parts of first surface treatment agent, 17.61 parts of first hydroxyl polysiloxane, 6 parts of alcohol compound, 0.23 parts of platinum complex catalyst, and 18 parts of first flame retardant; the raw materials for preparing component B include: 9.14 parts of second base rubber, 1.71 parts of second reinforcing agent, 3.77 parts of second surface treatment agent, 7.54 parts of second hydroxyl polysiloxane, 22.62 parts of filler, 5.65 parts of vinyl-terminated silicone oil, 41 parts of hydrogen-containing silicone oil, 0.11 parts of crosslinking agent, and 7.54 parts of second flame retardant.

[0083] The first base adhesive and the second base adhesive are both vinyl silicone oils, and the viscosity of both the first base adhesive and the second base adhesive is 5000 MPa·s at 25°C.

[0084] The hydrogen content of the hydrogen-containing silicone oil is 0.8 wt%.

[0085] Both the first reinforcing agent and the second reinforcing agent are fumed silica produced by fumed silica production, and both have a specific surface area of ​​380 m². 2 / g.

[0086] Both the first and second surface treatment agents are hexamethyldisilazane.

[0087] Both the first hydroxyl polysiloxane and the second hydroxyl polysiloxane are 107 adhesives.

[0088] The viscosity of the first hydroxyl polysiloxane at 25°C is 600 MPa·s; the viscosity of the second hydroxyl polysiloxane at 25°C is 300 MPa·s.

[0089] The alcohol compound is a mixture of n-butanol and n-hexanol, with a mass ratio of n-butanol to n-hexanol of 1:1.

[0090] The platinum complex catalyst is a vinylsiloxane chloroplatinate chelate.

[0091] Both the first and second flame retardants are aluminum hydroxide, with an average particle size of 8 μm and a specific surface area of ​​250–450 m². 2 / g.

[0092] The filler is diatomaceous earth, and the particle size of the diatomaceous earth is 2500 mesh.

[0093] The vinyl-terminated silicone oil has a viscosity of 300 MPa·s at 25°C; the crosslinking agent is tetravinyltetramethylcyclotetrasiloxane.

[0094] The mass ratio of component A to component B is 1:1.

[0095] Example 3 was prepared using the same preparation method as Example 1.

[0096] Example 4 The specific implementation method of Example 4 is basically the same as that of Example 1, except that the weight of the hydrogen-containing silicone oil in this example is 20 parts.

[0097] Example 5 The specific implementation method of Example 5 is basically the same as that of Example 1, except that the specific surface area of ​​the first reinforcing agent in this example is 200m². 2 / g, the specific surface area of ​​the first reinforcing agent is 380m².2 / g.

[0098] Example 6 The specific implementation of Example 6 is basically the same as that of Example 1, except that the average particle size of the first flame retardant and the second flame retardant in this example is 1 μm.

[0099] Example 7 The specific implementation method of Example 7 is basically the same as that of Example 1, except that the particle size of the diatomaceous earth in this example is 800 mesh.

[0100] Example 8 The specific implementation method of Example 8 is basically the same as that of Example 1, except that the platinum catalyst in this example is a chloroplatinic acid alcohol solution.

[0101] Example 9 The specific implementation method of Comparative Example 9 is basically the same as that of Example 1, except that the first surface treatment agent and the second surface treatment agent in this comparative example are both methyldiethoxysilane. Comparative Example 1 The specific implementation method of Comparative Example 1 is basically the same as that of Example 1, except that the viscosity of the first base adhesive and the second base adhesive at 25°C is 200 MPa·s.

[0102] Comparative Example 2 The specific implementation method of Comparative Example 2 is basically the same as that of Example 1, except that the viscosity of the first base adhesive and the second base adhesive at 25°C is 100000 MPa·s.

[0103] Performance testing The foamed silicone rubber prepared in the above examples and comparative examples was subjected to physical property tests. The test standards are shown in Table 1, and the test results are shown in Table 2.

[0104] Table 1 Test Standards

[0105] Table 2 Test Results

[0106] As can be seen from the above embodiments and comparative examples, this application can prepare foamed silicone rubber with a suitable cell diameter by controlling the viscosity range of vinyl silicone oil to 1000-8000 MPa·s, thereby improving the uniformity of the cell structure of the material. The foamed silicone rubber has a low thermal conductivity and excellent mechanical properties.

[0107] It should be noted that, in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0108] This invention is not limited to the embodiments described above. Those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention. Contents not described in detail in this specification are prior art known to those skilled in the art.

Claims

1. A two-component foamed silicone rubber, characterized in that, The two-component foamed silicone rubber comprises component A and component B; the raw materials for preparing component A include: a first base rubber, a first reinforcing agent, a first surface treatment agent, a first hydroxyl polysiloxane, an alcohol compound, a platinum complex catalyst, and a first flame retardant; the raw materials for preparing component B include: a second base rubber, a second reinforcing agent, a second surface treatment agent, a second hydroxyl polysiloxane, a filler, a vinyl-terminated silicone oil, a hydrogen-containing silicone oil, a crosslinking agent, and a second flame retardant; Both the first base adhesive and the second base adhesive are vinyl silicone oils, and the viscosity of the first base adhesive and the second base adhesive at 25°C is 1000-8000 MPa·s.

2. The two-component foamed silicone rubber as described in claim 1, characterized in that, By weight: the raw materials for preparing component A include: 30-50 parts of the first base adhesive, 10-20 parts of the first reinforcing agent, 1-7 parts of the first surface treatment agent, 10-40 parts of the first hydroxyl polysiloxane, 2-8 parts of alcohol compounds, 0.1-0.4 parts of platinum complex catalyst, and 15-20 parts of the first flame retardant.

3. The two-component foamed silicone rubber as described in claim 1, characterized in that, By weight: the raw materials for preparing component B include: 5-15 parts of second base adhesive, 1-10 parts of second reinforcing agent, 0.1-5 parts of second surface treatment agent, 5-15 parts of second hydroxyl polysiloxane, 15-25 parts of filler, 5-10 parts of vinyl-terminated silicone oil, 40-50 parts of hydrogen-containing silicone oil, 0.1-0.5 parts of crosslinking agent, and 5-15 parts of second flame retardant.

4. The two-component foamed silicone rubber as described in claim 1, characterized in that, The first reinforcing agent and the second reinforcing agent are selected from fumed silica or fumed silicon dioxide.

5. The two-component foamed silicone rubber as described in claim 1, characterized in that, The specific surface area of ​​both the first reinforcing agent and the second reinforcing agent is 300-400 m². 2 / g.

6. The two-component foamed silicone rubber as described in claim 1, characterized in that, The first and second surface treatment agents are selected from hexamethyldisilazane or methyldiethoxysilane.

7. The two-component foamed silicone rubber as described in claim 1, characterized in that, The hydrogen content of the hydrogen-containing silicone oil is 1.3-1.6 wt%.

8. The two-component foamed silicone rubber as described in claim 1, characterized in that, The particle size of both the first and second flame retardants is 6-10 μm.

9. A method for preparing a two-component foamed silicone rubber as described in any one of claims 1-8, characterized in that, The preparation method includes the following steps: Preparation of Component A: The first base adhesive, the first reinforcing agent, and the first surface treatment are heated and kneaded, then vacuumed, cooled, and sealed for storage to obtain the first mixture; Component A is obtained by mixing the first mixture, the first hydroxyl polysiloxane, the first flame retardant, the platinum complex catalyst, and the alcohol compound evenly. Preparation of Component B: The second base adhesive, the second reinforcing agent, and the second surface treatment agent are heated and kneaded, then vacuumed, cooled, and sealed to obtain the second mixture; Component B is obtained by uniformly mixing the second mixture, the second hydroxyl polysiloxane, the filler, the vinyl-terminated silicone oil, the hydrogen-containing silicone oil, the crosslinking agent, and the second flame retardant. The preparation of the two-component foamed silicone rubber is as follows: Component A and Component B are mixed in a certain mass ratio, and the mixture is calendered, cured, vulcanized twice, and wound up to obtain the two-component foamed silicone rubber.

10. The application of the two-component foamed silicone rubber as described in any one of claims 1-8 in power batteries.

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