Optimized application method of methyl vinyl silicone rubber high-performance additive

Abstract

The invention relates to the technical field of high polymer materials, in particular to an optimized application method of a methyl vinyl silicone rubber high-performance additive. Comprising the following steps: preheating a methyl vinyl silicone rubber base material to 50-80 DEG C in mixing equipment, and keeping dynamic shear mixing; at least two functional additives are added in stages, vacuum dehydration treatment is synchronously applied in the mixing process, the vacuum degree is smaller than or equal to-0.08 MPa, and the vacuum dehydration treatment lasts until the water content of a system is smaller than 0.02%; the mixed material is transferred into vulcanization equipment, a gradient heating vulcanization process is adopted, the vulcanization temperature in the first stage is 130-150 DEG C, the temperature is increased to 160-180 DEG C in the second stage, and the total vulcanization time is 10-30 minutes. The invention provides a systematized additive optimization application method, and comprehensive improvement of the performance of the methyl vinyl silicone rubber is realized through fine design of process parameters, innovative regulation and control of an additive structure and a multi-stage synergistic action mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly to an optimized application method for high-performance additives of methyl vinyl silicone rubber. Background Art

[0002] Methyl vinyl silicone rubber (VMQ), as a high-performance silicone material, is widely used in high-end fields such as aerospace seals, high-temperature cable insulation layers, and new energy vehicle battery pack protection components due to its excellent high and low temperature resistance, weather resistance, electrical insulation, and chemical stability. With the continuous improvement of industrial technology's requirements for material properties, especially the application requirements under extreme temperatures, complex mechanical stresses, and long-term aging environments, higher challenges are posed to the comprehensive performance of methyl vinyl silicone rubber. For example, it is required to simultaneously meet indicators such as high strength, high heat resistance, low compression set, and long-term stability.

[0003] Traditional modification methods for methyl vinyl silicone rubber usually involve adding functional fillers (such as silica, carbon nanotubes, etc.) and additives (such as heat stabilizers, crosslinking agents) to improve its performance. However, there are still significant limitations in the application of additives in the existing technology. Firstly, the dispersion uniformity of the filler directly affects the mechanical properties of the material. In the conventional mixing process, adding multiple additives at once easily causes agglomeration of nano-scale fillers due to their high surface energy, reducing the reinforcement effect. Secondly, the synergistic effect between the heat stabilizer and the crosslinking accelerator is insufficient, and thermal degradation or premature crosslinking is likely to occur at high temperatures, resulting in a decrease in the heat resistance life of the material. In addition, trace moisture in the silicone rubber substrate may cause side reactions during the vulcanization process, forming bubbles or reducing the crosslinking density, thereby affecting the density and durability of the product.

[0004] In the existing process, there is also room for optimization in the control of the conditions in the mixing and vulcanization processes. For example, the mismatch between the mixing temperature and time may lead to insufficient reaction or thermal damage of the additives; when a single temperature and pressure parameter is used in the vulcanization stage, it is easy to cause uneven distribution of the crosslinking network, affecting the dynamic mechanical properties of the material. Although some studies have attempted to improve the process by stepwise addition or vacuum dehydration, there are still problems such as low dehydration efficiency and uncontrollable release of additives, making it difficult to meet the requirements of high-precision application scenarios. Summary of the Invention

[0005] The present invention provides a systematic optimized application method for additives, which comprehensively improves the performance of methyl vinyl silicone rubber through the refined design of process parameters, the innovative regulation of additive structures, and the multi-stage synergistic mechanism.

[0006] The technical solution adopted by the present invention is: an optimized application method for high-performance additives of methyl vinyl silicone rubber, comprising the following steps:

[0007] S1: Pre-bake the methyl vinyl silicone rubber substrate at 80 - 100 °C for 2 - 4 hours, and use a molecular sieve adsorption device to maintain the environmental dew point ≤ -40 °C;

[0008] S2: Preheat the methyl vinyl silicone rubber substrate in a mixing device to 50 - 80 °C and maintain dynamic shear mixing;

[0009] S3: Add at least two functional additives in stages, including:

[0010] In the first stage, add a nano-scale reinforcing filler with an addition amount of 1 - 5% of the substrate mass, and the mixing time is 5 - 15 minutes;

[0011] In the second stage, add a complex of a heat stabilizer and a crosslinking promoter with an addition amount of 0.5 - 3% of the substrate mass, raise the mixing temperature to 90 - 120 °C, and the mixing time is 8 - 20 minutes;

[0012] S4: Apply vacuum dehydration treatment synchronously during the mixing process, with the vacuum degree ≤ -0.08 MPa, continuing until the system moisture content < 0.02%;

[0013] S5: Transfer the mixed material to a vulcanization device and adopt a gradient heating vulcanization process. The vulcanization temperature in the first stage is 130 - 150 °C, and in the second stage, it is raised to 160 - 180 °C, with a total vulcanization time of 10 - 30 minutes.

[0014] As a further improvement of the present invention, the nano-scale reinforcing filler is selected from at least one of surface-modified nano-silica, carbon nanotubes, and montmorillonite, with a specific surface area of 150 - 400 m 2 / g and a particle size distribution of 10 - 100 nm.

[0015] As a further improvement of the present invention, the surface modification of the nano-scale reinforcing filler is carried out using a silane coupling agent. The dosage of the silane coupling agent is 0.5 - 3% of the filler mass, the treatment temperature is 60 - 90 °C, the treatment time is 30 - 90 minutes, and the surface hydroxyl content of the treated filler < 0.1%.

[0016] As a further improvement of the present invention, the complex of the heat stabilizer and the crosslinking promoter is composed of the following mass ratios:

[0017] Heat stabilizer: platinum-containing complex, rare earth oxide, accounting for 60 - 80% of the complex;

[0018] Crosslinking promoter: peroxide initiator, silane coupling agent, accounting for 20 - 40% of the complex;

[0019] Among them, the complex is prepared into a microcapsule structure by spray drying, with a coating rate of 85 - 98%.

[0020] As a further improvement of the present invention, the process parameters of the spray drying method include: the inlet temperature is 120 - 160 °C, the outlet temperature is 50 - 80 °C, the atomization pressure is 0.2 - 0.6 MPa, and the wall thickness of the microcapsule structure is 1 - 5 μm, and the particle size distribution is 10 - 50 μm.

[0021] As a further improvement of the present invention, the interval time between the two-stage addition in S3 is 2 - 5 minutes, and ultrasonic treatment with a frequency of 10 - 30 kHz is synchronously applied during the second-stage mixing.

[0022] As a further improvement of the present invention, the power density of the ultrasonic treatment is 100 - 300 W / L, and the direction of the ultrasonic action forms an angle of 45 - 90° with the shear direction of the mixing equipment, and the action time is 30 - 60% of the total mixing time in the second stage.

[0023] As a further improvement of the present invention, in the gradient temperature rise vulcanization process, the vulcanization pressure in the first stage is 5 - 10 MPa, and the holding time accounts for 40 - 60% of the total vulcanization time; the vulcanization pressure in the second stage is increased to 12 - 15 MPa, and a nitrogen protection atmosphere is introduced, and the oxygen content is controlled at <50 ppm.

[0024] As a further improvement of the present invention, the vacuum dehydration treatment is carried out synchronously with the mixing operation in S3, and the vacuum degree is periodically switched during the dehydration process, the switching frequency is 0.5 - 2 times / minute, and the vacuum degree fluctuation range is -0.06 MPa to -0.1 MPa.

[0025] Application of the methyl vinyl silicone rubber composite material prepared by the above method in aerospace seals, high-temperature cable insulation layers or new energy vehicle battery pack protection components.

[0026] Advantages of the present invention: (1) By adding nano-scale reinforcing fillers and microencapsulated composite additives in stages, and combining dynamic shear mixing and ultrasonic treatment technologies, the present invention effectively solves the agglomeration problem caused by the high surface energy of nano-fillers, and significantly improves the dispersion uniformity of the fillers in the matrix (the dispersion efficiency is increased by 30% - 50%). At the same time, the heat-resistant stabilizer / crosslinking accelerator complex in the microcapsule structure realizes controlled release during the mixing process, avoiding premature crosslinking or thermal degradation, enabling the crosslinking reaction to precisely match the temperature gradient in the vulcanization stage, forming a dense and uniform three-dimensional network structure, with the tensile strength of the material increased by 15% - 25% and the heat-resistant aging life extended by more than 40%.

[0027] (2) The present invention synchronizes vacuum dehydration with mixing and introduces a periodic vacuum degree switching technology (fluctuation range: -0.06 MPa to -0.1 MPa). By strengthening the kinetic process of moisture removal through pressure fluctuations, the moisture content in the system can be rapidly reduced to below 0.02% (the dehydration time is shortened by 20% - 35%), completely eliminating the defect of vulcanization bubbles. The gradient heating vulcanization process is combined with a nitrogen protection atmosphere to regulate the vulcanization pressure (5 - 15 MPa) and temperature (130 - 180 °C) in stages, promoting the full penetration and reaction of crosslinking agents. The compression set rate of the obtained products is reduced to below 8%, and the dynamic fatigue performance is improved by more than 50%, meeting the high-precision requirements of scenarios such as aerospace seals.

[0028] (3) Through the precise regulation of the specific surface area (150 - 400 m 2 / g) and particle size distribution (10 - 100 nm) of nano-fillers, as well as the optimized design of the microcapsule coating rate (85% - 98%) of composite additives, the dielectric strength, thermal conductivity, and tear resistance of the material can be directionally adjusted according to different application scenarios (such as high-temperature cable insulation layers or battery pack protection components). For example, the synergistic effect of carbon nanotubes and rare earth oxides can keep the volume resistivity of the composite material > 1 × 10 14 Ω·cm at 180 °C, while the thermal conductivity is increased to above 0.35 W / (m·K), significantly broadening the application boundary of methyl vinyl silicone rubber in extreme environments. Detailed implementation manners

[0029] In order to make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following further details this application in combination with embodiments. It should be understood that the embodiments described herein are only used to explain this application and are not used to limit this application.

[0030] The present invention provides an optimized application method for high-performance additives of methyl vinyl silicone rubber, including the following steps:

[0031] S1: Pre-bake the methyl vinyl silicone rubber substrate at 80 - 100 °C for 2 - 4 hours, and use a molecular sieve adsorption device to maintain the environmental dew point ≤ -40 °C;

[0032] S2: Preheat the methyl vinyl silicone rubber substrate in a mixing device to 50 - 80 °C and maintain dynamic shear mixing;

[0033] S3: Add at least two functional additives in stages, including:

[0034] In the first stage, add nano-scale reinforcing fillers, with an addition amount of 1 - 5% of the substrate mass, and the mixing time is 5 - 15 minutes;

[0035] In the second stage, a complex of a heat stabilizer and a crosslinking promoter is added, and the addition amount is 0.5-3% of the mass of the substrate. The mixing temperature is raised to 90-120°C, and the mixing time is 8-20 minutes;

[0036] S4: During the mixing process, vacuum dehydration treatment is applied synchronously, the vacuum degree ≤ -0.08 MPa, and it continues until the moisture content of the system < 0.02%;

[0037] S5: Transfer the mixed material to a vulcanization device, and adopt a gradient temperature rise vulcanization process. The vulcanization temperature in the first stage is 130-150°C, and it is raised to 160-180°C in the second stage. The total vulcanization time is 10-30 minutes.

[0038] In the present invention, the nano-scale reinforcing filler is selected from at least one of surface-modified nano-silica, carbon nanotubes, and montmorillonite. Its specific surface area is 150-400 m 2 / g, the particle size distribution is 10-100 nm. The surface modification of the nano-scale reinforcing filler is carried out by treatment with a silane coupling agent. The dosage of the silane coupling agent is 0.5-3% of the mass of the filler, the treatment temperature is 60-90°C, the treatment time is 30-90 minutes, and the surface hydroxyl content of the treated filler < 0.1%.

[0039] The complex of the heat stabilizer and the crosslinking promoter in the present invention is composed of the following mass ratios: (1) Heat stabilizer: platinum-containing complex, rare earth oxide, accounting for 60-80% of the complex; (2) Crosslinking promoter: peroxide initiator, silane coupling agent, accounting for 20-40% of the complex; wherein, the complex is prepared into a microcapsule structure by spray drying, and the coating rate is 85-98%. The process parameters of the spray drying method include: the inlet temperature is 120-160°C, the outlet temperature is 50-80°C, the atomization pressure is 0.2-0.6 MPa, and the wall thickness of the microcapsule structure is 1-5 μm, and the particle size distribution is 10-50 μm.

[0040] In the present invention, the interval time between the two-stage additions in S3 is 2-5 minutes, and ultrasonic treatment with a frequency of 10-30 kHz is applied synchronously during the second-stage mixing. The power density of the ultrasonic treatment is 100-300 W / L, and the direction of the ultrasonic action forms an angle of 45-90° with the shear direction of the mixing device, and the action time is 30-60% of the total second-stage mixing time.

[0041] In the gradient temperature rise vulcanization process of the present invention, the vulcanization pressure in the first stage is 5-10 MPa, and the holding time accounts for 40-60% of the total vulcanization time; the vulcanization pressure in the second stage is increased to 12-15 MPa, and a nitrogen protection atmosphere is introduced, and the oxygen content is controlled at < 50 ppm.

[0042] In the present invention, the vacuum dehydration treatment is carried out synchronously with the kneading operation in S3, and the vacuum degree is periodically switched during the dehydration process. The switching frequency is 0.5 - 2 times per minute, and the vacuum degree fluctuation range is from -0.06 MPa to -0.1 MPa.

[0043] Application of the methyl vinyl silicone rubber composite material prepared by the above method in aerospace seals, high-temperature cable insulation layers or new energy vehicle battery pack protection components.

[0044] Example 1: Preparation of composite material for aerospace seals

[0045] Step S1: Take 1000 g of methyl vinyl silicone rubber substrate (grade VMQ-260), place it in an oven and pre-bake at 90 °C for 3 hours. At the same time, use a molecular sieve adsorption device (model MSA-5) to maintain the environmental dew point at -45 °C.

[0046] Step S2: Add the pre-baked substrate to an internal mixer (rotation speed 40 rpm), preheat to 70 °C, and start dynamic shear mixing (shear rate 500 s -1 )

[0047] Step S3:

[0048] First stage: Add nano-silica surface-modified with silane coupling agent KH-570 (specific surface area 300 m 2 / g, D50 = 50 nm), and the addition amount is 3% (30 g) of the substrate mass, and knead for 10 minutes;

[0049] After an interval of 3 minutes, in the second stage: add microencapsulated composite additives (coating rate 92%), where the heat stabilizer is platinum complex (60%) and cerium oxide (20%), and the crosslinking promoter is dicumyl peroxide (DCP, 15%) and vinyltrimethoxysilane (5%). The addition amount is 2% (20 g) of the substrate mass, heat up to 110 °C, and simultaneously apply 20 kHz ultrasonic treatment (power 300 W), and knead for 15 minutes.

[0050] Step S4: Vacuum dehydration is carried out synchronously throughout the kneading process. The vacuum degree is periodically switched (0.8 times per minute, fluctuation range -0.07 MPa to -0.09 MPa) until the moisture content reaches 0.018%.

[0051] Step S5: Transfer the material to a flat vulcanizer. The vulcanization temperature in the first stage is 140 °C, the pressure is 8 MPa, and it is maintained for 12 minutes (accounting for 60% of the total time); in the second stage, heat up to 170 °C, the pressure is 14 MPa, and nitrogen is introduced (oxygen content < 30 ppm), and vulcanize for 8 minutes.

[0052] Test results: The tensile strength of the obtained material is 12.5 MPa (a 22% increase), the strength retention rate after 1000 hours of thermal aging at 250 °C is 85% (compared with 58% of the traditional process), the compression set rate is 6.8%, and the vulcanization bubble rate is 0%.

[0053] Example 2: Preparation of composite material for high-temperature cable insulation layer

[0054] Step S1: Take 800 g of VMQ-320 substrate, pre-bake at 85 °C for 4 hours, and the environmental dew point is -50 °C.

[0055] Step S2: Preheat the internal mixer to 65 °C and perform dynamic shear mixing (shear rate 600 s -1 ).

[0056] Step S3:

[0057] First stage: Add a 1:1 mixture of carbon nanotubes (specific surface area 250 m 2 / g, D50 = 30 nm) and montmorillonite (specific surface area 180 m 2 / g, D50 = 80 nm), with a total addition amount of 4% (32 g), and knead for 8 minutes;

[0058] After a 5-minute interval, in the second stage: Add a microcapsule composite additive (coating rate 95%), containing platinum complex (70%), lanthanum oxide (10%), DCP (12%), and silane coupling agent (8%), with an addition amount of 1.5% (12 g), heat up to 100 °C, apply 25 kHz ultrasonic wave (power 250 W), and knead for 18 minutes.

[0059] Step S4: The vacuum dehydration cycle switching frequency is 1.5 times / minute (-0.08 MPa to -0.1 MPa), and the final moisture content is 0.015%.

[0060] Step S5: The first stage of vulcanization is at 150 °C and a pressure of 10 MPa (for 10 minutes), and the second stage is at 180 °C and a pressure of 15 MPa (nitrogen oxygen content < 20 ppm, for 5 minutes).

[0061] Test results: Volume resistivity 1.2×10 15 Ω·cm (at 180 °C), thermal conductivity 0.38 W / (m·K), dielectric strength 45 kV / mm, and tear strength 25 kN / m (a 30% increase compared with the traditional process).

[0062] Example 3: Preparation of composite material for new energy vehicle battery pack protection components

[0063] Step S1: 1200 g of VMQ-280 substrate, pre-bake at 100 °C for 2.5 hours, and the dew point is -42 °C.

[0064] Step S2: The internal mixer is preheated to 75°C with a shear rate of 450 s-1.

[0065] Step S3:

[0066] First stage: Add 2% (24 g) of montmorillonite (specific surface area 220 m 2 / g, D50 = 70 nm) and knead for 12 minutes;

[0067] After a 2-minute interval, in the second stage: Add the microcapsule composite additive (coating rate 88%), containing platinum complex (65%), yttrium oxide (15%), benzoyl peroxide (BIPB, 12%), and silane coupling agent (8%), with an addition amount of 2.5% (30 g), heat up to 120°C, apply 15 kHz ultrasonic waves (power 350 W), and knead for 10 minutes.

[0068] Step S4: The vacuum fluctuation range is -0.06 MPa to -0.1 MPa (switching frequency 2 times / minute), and the moisture content is 0.017%.

[0069] Step S5: The first stage of vulcanization is at 130°C and a pressure of 5 MPa (8 minutes), and the second stage is at 160°C and a pressure of 12 MPa (nitrogen oxygen content < 40 ppm, 7 minutes).

[0070] Test results: The impact strength is 50 kJ / m 2 , the volume expansion rate after soaking in the electrolyte (LiPF6 / EC-DMC) for 30 days is < 3%, the thermal conductivity is 0.32 W / (m·K), meeting the IP67 protection standard.

[0071] Comparative example: Traditional one-step kneading process

[0072] Steps: Add 1000 g of VMQ-260 substrate, 3% of uncoated nano-silica, 1% of DCP, and 1% of cerium oxide to the internal mixer at one time, knead at 80°C for 25 minutes, vacuum dehydrate (constant -0.08 MPa) until the moisture content is 0.03%, and the vulcanization conditions are 150°C / 10 MPa in a single stage for 20 minutes.

[0073] Test results: The tensile strength is 9.8 MPa, the strength retention rate after thermal aging is 52%, the compression set rate is 12%, and the bubble rate inside the material is 0.5%.

[0074] The effect data of Examples 1 - 3 and the comparative example are shown in the following table.

[0075]

[0076]

[0077] As can be seen from the above table, in Example 1 of the present invention compared with the comparative example, the tensile strength is increased by 27.6%, the thermal aging life is extended by 63.5%, the compression set rate is reduced by 43.3%, and the bubble defect is completely eliminated, verifying the synergistic advantages of staged addition, microcapsule controlled release and gradient vulcanization.

[0078] In summary, an optimized application method of a high-performance additive for methyl vinyl silicone rubber of the present invention significantly improves the comprehensive performance of the methyl vinyl silicone rubber composite material. The methyl vinyl silicone rubber composite material prepared by the present invention exhibits excellent performance stability and reliability in extreme environments, and can meet the urgent needs of high-performance elastomers in fields such as aerospace, new energy vehicles, and energy and power. For example, in the protection component of a new energy vehicle battery pack, its electrolyte corrosion resistance can extend the service life of the battery pack to more than 10 years; in the field of high-temperature cables, its long-term insulation performance at 180°C can replace traditional fluororubber, reducing the material cost by more than 30%. In addition, the process of the present invention has strong compatibility and can be adapted to existing mixing and vulcanization equipment, with the potential for rapid industrialization and promotion.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber, characterized in that: The following steps are involved: S1: Pre-bake the methyl vinyl silicone rubber substrate at 80-100°C for 2-4 hours, and use a molecular sieve adsorption device to maintain the ambient dew point ≤-40°C; S2: preheating the methyl vinyl silicone rubber substrate to 50-80°C in a mixing device and maintaining dynamic shear mixing; S3: Add at least two functional additives in stages, including: In the first stage, nano-scale reinforcing fillers are added in an amount of 1-5% of the mass of the substrate, and the mixing time is 5-15 minutes; In the second stage, a compound of a heat-resistant stabilizer and a cross-linking accelerator is added in an amount of 0.5-3% of the mass of the substrate, the mixing temperature is raised to 90-120°C, and the mixing time is 8-20 minutes; S4: During the mixing process, vacuum dehydration treatment is applied synchronously, with a vacuum degree of ≤-0.08MPa, and the treatment is continued until the water content of the system is <0.02%; S5: The mixed material is transferred to the vulcanization equipment and a gradient temperature vulcanization process is adopted. The vulcanization temperature in the first stage is 130-150°C, and the temperature in the second stage is increased to 160-180°C. The total vulcanization time is 10-30 minutes.

2. The method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber according to claim 1, characterized in that: The nano-scale reinforcing filler is selected from at least one of surface-modified nano-silicon dioxide, carbon nanotubes, and montmorillonite, and has a specific surface area of ​​150-400 m 2 / g, and the particle size distribution is 10-100nm.

3. The method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber according to claim 2, characterized in that: The surface modification of the nano-scale reinforced filler is carried out by silane coupling agent treatment, the amount of silane coupling agent is 0.5-3% of the filler mass, the treatment temperature is 60-90°C, the treatment time is 30-90 minutes, and the surface hydroxyl content of the filler after treatment is less than 0.1%.

4. The method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber according to claim 1, characterized in that: The composite of the heat-resistant stabilizer and the cross-linking accelerator is composed of the following mass ratios: Heat-resistant stabilizer: containing platinum complex and rare earth oxide, accounting for 60-80% of the complex; Cross-linking accelerator: peroxide initiator, silane coupling agent, accounting for 20-40% of the composite, The composite is prepared into a microcapsule structure by a spray drying method, and the coverage rate is 85-98%.

5. The method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber according to claim 4, characterized in that: The process parameters of the spray drying method include: an inlet temperature of 120-160° C., an outlet temperature of 50-80° C., an atomization pressure of 0.2-0.6 MPa, a wall thickness of the microcapsule structure of 1-5 μm, and a particle size distribution of 10-50 μm.

6. The method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber according to claim 1, characterized in that: The interval time between the two-stage addition in S3 is 2-5 minutes, and ultrasonic treatment with a frequency of 10-30 kHz is simultaneously applied during the second stage of mixing.

7. The method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber according to claim 6, characterized in that: The power density of the ultrasonic treatment is 100-300 W / L, and the ultrasonic action direction forms an angle of 45-90° with the shear direction of the mixing equipment, and the action time is 30-60% of the total mixing time of the second stage.

8. The method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber according to claim 1, characterized in that: In the gradient temperature vulcanization process, the first stage vulcanization pressure is 5-10MPa, and the holding time accounts for 40-60% of the total vulcanization time; the second stage vulcanization pressure is increased to 12-15MPa, and a nitrogen protective atmosphere is introduced, and the oxygen content is controlled at <50ppm.

9. The method for optimizing the application of a high-performance additive for methyl vinyl silicone rubber according to claim 1, characterized in that: The vacuum dehydration treatment is carried out synchronously with the mixing operation in S3, and the vacuum degree is periodically switched during the dehydration process, with a switching frequency of 0.5-2 times / minute and a vacuum degree fluctuation range of -0.06 MPa to -0.1 MPa.

10. Application of the methyl vinyl silicone rubber composite material prepared by the method according to claim 1 in aerospace seals, high temperature cable insulation layers or new energy vehicle battery pack protection components.

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