High-temperature-resistant silica gel and preparation method thereof

Abstract

The invention belongs to the technical field of silica gel preparation, and discloses high-temperature-resistant silica gel and a preparation method thereof.The high-temperature-resistant silica gel comprises matrix silica gel, filler, a cross-linking agent, a plasticizer, an antioxidant and a coloring agent, the matrix silica gel accounts for 72% of the total formula, the filler accounts for 25% of the total formula, the cross-linking agent accounts for 2% of the total formula, the plasticizer accounts for 2% of the total formula, and the antioxidant accounts for 2% of the total formula. The plasticizer accounts for 10% of the total formula. Through the selection of the plasticizer silicone oil and the precise regulation and control of the viscosity, the silica gel is endowed with good flexibility and processability, so that the silica gel can still keep good form and performance in a high-temperature environment, the degradation reaction in high-temperature and oxidation environments is effectively prevented, the service life of the material is remarkably prolonged, and meanwhile, the silica gel can be used as a high-temperature-resistant material. By adopting the non-volatile high-temperature dye, the color selection of the silica gel is enriched, the color stability under a high-temperature condition is also ensured, the color fading phenomenon is avoided, and the requirements of high-end fields on attractive appearance and performance are met.

Description

Technical Field

[0001] The invention belongs to the technical field of silica gel preparation, and specifically relates to high temperature resistant silica gel and a preparation method thereof. Background Art

[0002] Silica gel, also known as silica gel or silica oxide, is a highly active adsorption material. Due to its excellent properties, silica gel is often used in various fields. Among them, because silica gel is safe and non-toxic, it is often used in the food field, that is, food-grade silica gel. Food-grade silica gel is an inorganic polymer colloidal material formed by the polycondensation of silicic acid. Food-grade silica gel is non-toxic and tasteless, with stable chemical properties and will not cause any harm to the human body. Under normal conditions, food-grade silica gel does not react with any acid, alkali or salt except caustic alkali and hydrofluoric acid, showing extremely strong chemical stability.

[0003] However, due to the characteristics of the material itself, traditional silicone materials have poor high temperature resistance, which is specifically manifested in the following aspects: silicone is a polymer mainly composed of silicon oxygen chains. Although the silicon oxygen bond is better than many organic polymers in thermal stability, at high temperatures, the polymer chain may degrade or break, thereby reducing its performance. In a high temperature environment, volatile additives (such as plasticizers or fillers) that may be contained in silicone will be released, resulting in a decrease in material performance. The degree of cross-linking of silicone affects its heat resistance. If the cross-linking is not sufficient, the material is prone to soften or deform at high temperatures. At high temperatures, silicone may react with oxygen in the air, resulting in surface aging and performance degradation. Summary of the invention

[0004] The object of the present invention is to provide a high temperature resistant silica gel and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a high-temperature resistant silica gel, comprising a base silica gel, a filler, a cross-linking agent, a plasticizer, an antioxidant, and a colorant, wherein the base silica gel accounts for 72% of the total formula, the filler accounts for 25% of the total formula, the cross-linking agent accounts for 2% of the total formula, the plasticizer accounts for 10% of the total formula, the antioxidant accounts for 0.5% of the total formula, and the colorant accounts for 0.5% of the total formula. The base silica gel adopts a silicone rubber model, and its component is a high-temperature silicone polymer. The filler adopts a white carbon black model, and its component is silicon dioxide. The cross-linking agent adopts an organic peroxide, the plasticizer adopts a silicone fluid model, and its component is silicone oil. The antioxidant adopts a tert-butylhydroquinone model, and its component is a phosphite antioxidant. The colorant adopts a non-volatile high-temperature dye.

[0006] As a further technical solution of the present invention, the silicon oxide content in the matrix silica gel is ≥80%, and the temperature range is controlled at -60°C to 200°C. The particle size of the silicon dioxide in the filler is in the range of 10-20 μm, and the moisture content is controlled at ≤0.5%.

[0007] As a further technical solution of the present invention, the active content of the organic peroxide in the crosslinking agent is controlled to be 50%, the decomposition temperature is ≥150°C, the viscosity of the silicone oil in the plasticizer is controlled to be 100-1000cSt, and the temperature range is controlled to be -50°C to 250°C.

[0008] As a further technical solution of the present invention, the melting point of the phosphite antioxidant is 69.7°C and it is soluble in an organic solvent, and the temperature resistance of the non-volatile high-temperature dye is ≥200°C.

[0009] A method for preparing high temperature resistant silica gel comprises the following steps:

[0010] S1: Raw material preparation;

[0011] S2: mixed treatment;

[0012] S3: degassing treatment;

[0013] S4: mold preparation;

[0014] S5: injection molding;

[0015] S6: curing treatment;

[0016] S7: demoulding and post-processing.

[0017] As a further technical solution of the present invention, the goal of the raw material preparation is to ensure that all raw materials are prepared in accordance with the required specifications and quantities, wherein the matrix silica gel needs to be checked for viscosity and fluidity to ensure that it is suitable for mixing, the filler needs to confirm the particle size distribution, and white carbon black suitable for high temperature applications is selected, the cross-linking agent needs to be confirmed in accordance with the product instructions to prevent insufficient or excessive reaction, the plasticizer needs to arrange the required fluidity to ensure compatibility with silica gel, the antioxidant needs to be weighed and sealed in a small container to prevent moisture from affecting the effect, and the colorant needs to be selected according to the final color requirements to ensure compatibility with other ingredients. The goal of the mixing process is to evenly mix all ingredients to ensure good material properties. The steps of the mixing process are as follows:

[0018] S1: Clean the mixer to ensure there is no residual material;

[0019] S2: Pour the base silica gel into the mixer and turn on the equipment;

[0020] S3: Slowly add filler at low speed to ensure that the filler is evenly dispersed and avoid particle agglomeration;

[0021] S4: Increase the speed, add plasticizer and antioxidant evenly, and continue mixing for 3-5 minutes;

[0022] S5: Finally, add the crosslinker and colorant at high speed and mix for 5-7 minutes until the material is uniform in color.

[0023] As a further technical solution of the present invention, the purpose of the degassing treatment is to remove bubbles generated during the mixing process to ensure the density of the material. The steps of the degassing treatment are as follows:

[0024] S1: Equipment preparation, check whether the vacuum degassing machine is working properly;

[0025] S2: Transfer the mixed silica gel material to a degassing tank, taking care to avoid introducing new bubbles;

[0026] S3: Start the vacuum pump, observe the pressure change, and record the degassing start time;

[0027] S4: During the degassing process, gently stir to help the bubbles rise and observe the bubbles disappear;

[0028] S5: While maintaining the set vacuum degree, record the degassing end time and stop the pump.

[0029] As a further technical solution of the present invention, the mold preparation needs to use CAD software to design the mold to ensure accurate size, and at the same time select aluminum alloy or steel with high thermal conductivity. The steps of preparing the mold are as follows:

[0030] S1: Cutting and processing molds to ensure the matching accuracy of each component;

[0031] S2: Polish the mold to ensure a smooth surface;

[0032] S3: Apply release agent, evenly cover the inner wall of the mold and let it dry.

[0033] The steps of injection molding are as follows:

[0034] S1: Check the function of the injection molding machine to ensure there is no fault;

[0035] S2: Heat the degassed silica gel material to 80-100°C to ensure good fluidity;

[0036] S3: Inject the material into the mold through the heating pipe to ensure that the temperature remains stable;

[0037] S4: Set the injection pressure to 0.5-1.0MPa and quickly inject into the mold;

[0038] S5: Maintain pressure for 5-10 minutes to ensure that the material completely fills the mold.

[0039] As a further technical solution of the present invention, the goal of the curing treatment is to ensure that the silicone material is completely cured and achieves the required physical properties. The steps of the curing treatment are as follows:

[0040] S1: Preheat the oven or curing furnace to the specified temperature;

[0041] S2: Place the mold after injection molding into the oven to ensure even placement;

[0042] S3: Record the time of entering the oven and set the curing time to 30-60 minutes;

[0043] S4: Check the temperature regularly to ensure uniform curing and avoid local overheating.

[0044] As a further technical solution of the present invention, the goal of the demoulding and post-processing is to remove the finished product from the mold and perform necessary post-processing. The steps of the demoulding and post-processing are as follows:

[0045] S1: After curing is completed, turn off the oven, wait for the mold to cool naturally to room temperature, and carefully disassemble the mold to avoid damage to the finished product;

[0046] S2: Check the appearance of the finished product, remove excess edges and burrs, and perform surface spraying and grinding as needed.

[0047] The beneficial effects of the present invention are as follows:

[0048] 1. The present invention significantly improves the high temperature resistance and overall stability of silicone materials through a carefully designed formula and preparation process. The base silicone uses high-purity, high-silicon oxide content siloxane rubber to ensure that the material can maintain excellent physical and chemical properties in a wide temperature range of -60°C to 200°C. Secondly, by selecting white carbon black with uniform particle size and low water content as filler, it not only enhances the mechanical strength and wear resistance of silicone, but also reduces the release of volatile additives at high temperatures, further improving the thermal stability of the material. In addition, the precise control of organic peroxides in the cross-linking agent ensures that the silicone can maintain excellent physical and chemical properties in a wide temperature range of -60°C to 200°C. It can stably cross-link at high temperatures to form a strong network structure, which effectively prevents the material from softening or deforming at high temperatures. The selection of plasticizer silicone oil and the precise control of its viscosity give silicone good flexibility and processing properties, allowing it to maintain good shape and performance in high temperature environments, effectively preventing degradation reactions in high temperature and oxidative environments, and significantly extending the service life of the material. At the same time, the use of non-volatile high-temperature dyes not only enriches the color options of silicone, but also ensures the stability of the color under high temperature conditions, avoids the occurrence of fading, and meets the high-end field's demand for both aesthetics and performance.

[0049] 2. The present invention greatly improves the production efficiency and product quality of high-temperature resistant silicone by optimizing the production process. The strict screening in the raw material preparation stage ensures the specifications and quality of all components, laying a solid foundation for subsequent processes. The mixing process adopts a gradually accelerated mixing method to achieve uniform dispersion of the components and avoid the problem of uneven performance. The vacuum degassing process effectively removes bubbles and enhances the density of the material. The accuracy of the mold design and the application of high thermal conductivity materials improve the molding efficiency and product quality. During the injection molding process, the precise control of temperature and pressure ensures that the silicone material quickly and evenly fills the mold and maintains a stable solidified state. The curing process achieves complete curing of the silicone material through reasonable temperature and time settings, ensuring that the physical properties of the product meet the standards. Finally, the meticulous operation of demoulding and post-processing protects the integrity of the product and further improves the aesthetics and quality of the product by removing defects and surface treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the overall preparation method of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] like Figure 1 As shown, in an embodiment of the present invention, a high temperature resistant silicone comprises a base silicone, a filler, a cross-linking agent, a plasticizer, an antioxidant, and a colorant, wherein the base silicone accounts for 72% of the total formula, the filler accounts for 25% of the total formula, the cross-linking agent accounts for 2% of the total formula, the plasticizer accounts for 10% of the total formula, the antioxidant accounts for 0.5% of the total formula, and the colorant accounts for 0.5% of the total formula. The base silicone is a silicone rubber whose component is a high temperature silicone polymer, the filler is white carbon black whose component is silicon dioxide, the cross-linking agent is an organic peroxide, the plasticizer is a silicone fluid whose component is silicone oil, the antioxidant is tert-butylhydroquinone whose component is a phosphite antioxidant, and the colorant is a non-volatile high temperature dye.

[0053] The above materials not only have excellent high temperature resistance, but also can maintain material stability under extreme temperatures, preventing aging and fading. Its unique formula improves the mechanical strength and flexibility of silicone, and is suitable for sealing, insulation and wear resistance in high temperature environments.

[0054] The silicon oxide content in the matrix silica gel is ≥80%, and the temperature range is controlled at -60°C to 200°C. The particle size of the silicon dioxide in the filler is in the range of 10-20 μm, and the water content is controlled at ≤0.5%.

[0055] The silicon oxide content in the base silica gel is as high as over 80%, ensuring that the material can perform well in a wide temperature range of -60°C to 200°C, showing excellent temperature resistance and stability. At the same time, the use of silica with a particle size of 10-20μm and a moisture content of less than 0.5% as a filler not only enhances the mechanical strength and wear resistance of silica gel, but also further optimizes its physical properties, so that it can still maintain stable performance in harsh environments such as high temperature and high humidity, meeting the strict requirements for material performance in high-end fields.

[0056] The active content of the organic peroxide in the crosslinking agent is controlled to be 50%, the decomposition temperature is ≥150°C, the viscosity of the silicone oil in the plasticizer is controlled to be 100-1000cSt, and the temperature range is controlled to be -50°C to 250°C.

[0057] By adjusting the active content of organic peroxide in the cross-linking agent to 50% and setting its decomposition temperature to no less than 150°C, it is ensured that the silicone can stably cross-link at high temperatures to form a solid network structure, thereby improving overall heat resistance and durability. At the same time, the viscosity of the plasticizer silicone oil is precisely controlled between 100-1000cSt and can remain effective in a wide temperature range of -50°C to 250°C, further enhancing the flexibility and processing performance of the silicone, allowing it to be flexibly used in high temperature environments.

[0058] Among them, the melting point of phosphite antioxidants is 69.7°C and they are soluble in organic solvents. The temperature resistance of non-volatile high-temperature dyes is ≥200°C.

[0059] The phosphite antioxidant used, with its melting point of 69.7℃ and good solubility in organic solvents, effectively prevents the degradation of silica gel in high temperature and oxidative environments, thus extending its service life. At the same time, the addition of non-volatile high temperature dyes not only gives silica gel a rich color selection, but also ensures that the color of silica gel is stable and does not fade under high temperature conditions with its temperature resistance of ≥200℃, giving equal emphasis to beauty and performance.

[0060] A method for preparing high temperature resistant silica gel comprises the following steps:

[0061] S1: Raw material preparation;

[0062] S2: mixed treatment;

[0063] S3: degassing treatment;

[0064] S4: mold preparation;

[0065] S5: injection molding;

[0066] S6: curing treatment;

[0067] S7: demoulding and post-processing.

[0068] Among them, the goal of raw material preparation is to ensure that all raw materials are prepared in accordance with the required specifications and quantities. The viscosity and fluidity of the base silica gel must be checked to ensure that it is suitable for mixing. The particle size distribution of the filler must be confirmed, and white carbon black suitable for high-temperature applications must be selected. The amount of the cross-linking agent must be confirmed according to the product instructions to prevent insufficient or excessive reaction. The plasticizer must have the required fluidity to ensure compatibility with silica gel. The antioxidant must be weighed and sealed in a small container to prevent moisture from affecting the effect. The colorant must be selected according to the final color requirements to ensure compatibility with other ingredients. The goal of the mixing process is to evenly mix all ingredients to ensure good material properties. The steps of the mixing process are as follows:

[0069] S1: Clean the mixer to ensure there is no residual material;

[0070] S2: Pour the base silica gel into the mixer and turn on the equipment;

[0071] S3: Slowly add filler at low speed to ensure that the filler is evenly dispersed and avoid particle agglomeration;

[0072] S4: Increase the speed, add plasticizer and antioxidant evenly, and continue mixing for 3-5 minutes;

[0073] S5: Finally, add the crosslinker and colorant at high speed and mix for 5-7 minutes until the material is uniform in color.

[0074] Carefully select and check the specifications of raw materials to ensure that the base silicone, filler, cross-linking agent, etc. are prepared as needed, and lay the foundation for high quality by controlling details such as viscosity, particle size, and dosage. During the mixing process, the step-by-step operation from low speed to high speed is aimed at achieving uniform dispersion and fusion of the ingredients, avoiding agglomeration and uneven reaction, and finally obtaining silicone materials with uniform color and excellent performance.

[0075] The purpose of degassing is to remove bubbles generated during the mixing process to ensure the density of the material. The steps of degassing are as follows:

[0076] S1: Equipment preparation, check whether the vacuum degassing machine is working properly;

[0077] S2: Transfer the mixed silica gel material to a degassing tank, taking care to avoid introducing new bubbles;

[0078] S3: Start the vacuum pump, observe the pressure change, and record the degassing start time;

[0079] S4: During the degassing process, gently stir to help the bubbles rise and observe the bubbles disappear;

[0080] S5: While maintaining the set vacuum degree, record the degassing end time and stop the pump.

[0081] The vacuum degassing machine effectively removes the bubbles generated during the mixing process to ensure the compactness and uniformity of the silicone material. This process not only improves the physical properties of the product, but also reduces the defects that may be caused by the presence of bubbles, laying a solid foundation for subsequent molding and application. Carefully controlled degassing steps, such as avoiding the introduction of new bubbles, observing pressure changes and stirring at the right time, ensure the maximum degassing effect and make the silicone material more flawless.

[0082] Among them, CAD software should be used for mold design during mold preparation to ensure accurate dimensions, and aluminum alloy or steel with high thermal conductivity should be selected. The steps for mold preparation are as follows:

[0083] S1: Cutting and processing molds to ensure the matching accuracy of each component;

[0084] S2: Polish the mold to ensure a smooth surface;

[0085] S3: Apply release agent, evenly cover the inner wall of the mold and let it dry.

[0086] The steps of injection molding are as follows;

[0087] S1: Check the function of the injection molding machine to ensure there is no fault;

[0088] S2: Heat the degassed silica gel material to 80-100°C to ensure good fluidity;

[0089] S3: Inject the material into the mold through the heating pipe to ensure that the temperature remains stable;

[0090] S4: Set the injection pressure to 0.5-1.0MPa and quickly inject into the mold;

[0091] S5: Maintain pressure for 5-10 minutes to ensure that the material completely fills the mold.

[0092] The mold size is accurate through CAD design, and high thermal conductivity materials are used to improve production efficiency. Mold polishing and mold release agent treatment ensure the appearance quality and smooth demoulding of the product. During the injection molding process, the material temperature and injection pressure are strictly controlled to ensure that the silicone material fills the mold evenly and quickly. By maintaining pressure, the material is fully solidified, thereby producing high-temperature resistant silicone products with accurate dimensions and smooth surfaces.

[0093] The goal of the curing process is to ensure that the silicone material is completely cured and achieves the required physical properties. The steps of the curing process are as follows:

[0094] S1: Preheat the oven or curing furnace to the specified temperature;

[0095] S2: Place the mold after injection molding into the oven to ensure even placement;

[0096] S3: Record the time of entering the oven and set the curing time to 30-60 minutes;

[0097] S4: Check the temperature regularly to ensure uniform curing and avoid local overheating.

[0098] Curing is a key step in the production of high temperature resistant silicone. It aims to ensure that the silicone material is fully cured by precisely controlling the temperature and time, thereby achieving the expected physical performance standards. This process not only improves the durability and stability of silicone products, but also ensures the consistency and reliability of the products. By preheating the oven, evenly placing the mold, setting a reasonable curing time and regularly monitoring the temperature, the curing process is ensured to proceed smoothly, and finally high-quality high temperature resistant silicone products are produced.

[0099] Among them, the goal of demoulding and post-processing is to remove the finished product from the mold and perform necessary post-processing. The steps of demoulding and post-processing are as follows:

[0100] S1: After curing is completed, turn off the oven, wait for the mold to cool naturally to room temperature, and carefully disassemble the mold to avoid damage to the finished product;

[0101] S2: Check the appearance of the finished product, remove excess edges and burrs, and perform surface spraying and grinding as needed.

[0102] By cooling the mold naturally, the finished product is ensured not to be damaged during demoulding, thus protecting the integrity of the product. Afterwards, the finished product appearance is carefully inspected and trimmed to remove defects, further improving the product's aesthetics and quality.

[0103] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant silica gel, comprising a matrix silica gel, a filler, a cross-linking agent, a plasticizer, an antioxidant, and a colorant, wherein the matrix silica gel accounts for 72% of the total formula, the filler accounts for 25% of the total formula, the cross-linking agent accounts for 2% of the total formula, the plasticizer accounts for 10% of the total formula, the antioxidant accounts for 0.5% of the total formula, and the colorant accounts for 0.5% of the total formula. The matrix silica gel is a silicone rubber with a high temperature silicone polymer as the component, the filler is a white carbon black with a component of silicon dioxide, the cross-linking agent is an organic peroxide, the plasticizer is a silicone fluid with a component of silicone oil, the antioxidant is a tert-butylhydroquinone with a component of a phosphite antioxidant, and the colorant is a non-volatile high temperature dye.

2. The high temperature resistant silica gel according to claim 1, characterized in that: The silicon oxide content in the matrix silica gel is ≥80%, and the temperature range is controlled at -60°C to 200°C. The particle size of the silicon dioxide in the filler is in the range of 10-20 μm, and the water content is controlled at ≤0.5%.

3. The high temperature resistant silica gel according to claim 1, characterized in that: The active content of the organic peroxide in the crosslinking agent is controlled to be 50%, the decomposition temperature is ≥150°C, the viscosity of the silicone oil in the plasticizer is controlled to be 100-1000 cSt, and the temperature range is controlled to be -50°C to 250°C.

4. The high temperature resistant silica gel according to claim 1, characterized in that: The phosphite antioxidant has a melting point of 69.7°C and is soluble in an organic solvent. The non-volatile high-temperature dye has a temperature resistance of ≥200°C.

5. The method for preparing high temperature resistant silica gel according to claim 1, characterized in that: The following steps are involved: S1: Raw material preparation; S2: mixed treatment; S3: degassing treatment; S4: mold preparation; S5: injection molding; S6: curing treatment; S7: demoulding and post-processing.

6. The method for preparing high temperature resistant silica gel according to claim 5, characterized in that: The goal of the raw material preparation is to ensure that all raw materials are prepared in accordance with the required specifications and quantities. The viscosity and fluidity of the base silica gel must be checked to ensure that it is suitable for mixing. The particle size distribution of the filler must be confirmed, and white carbon black suitable for high temperature applications must be selected. The amount of the cross-linking agent must be confirmed according to the product instructions to prevent insufficient or excessive reaction. The plasticizer must have the required fluidity to ensure compatibility with silica gel. The antioxidant must be weighed and sealed in a small container to prevent moisture from affecting the effect. The colorant must be selected according to the final color requirements to ensure compatibility with other ingredients. The goal of the mixing process is to evenly mix all ingredients to ensure good material properties. The steps of the mixing process are as follows: S1: Clean the mixer to ensure there is no residual material; S2: Pour the base silica gel into the mixer and turn on the equipment; S3: Slowly add filler at low speed to ensure that the filler is evenly dispersed and avoid particle agglomeration; S4: Increase the speed, add plasticizer and antioxidant evenly, and continue mixing for 3-5 minutes; S5: Finally, add the crosslinker and colorant at high speed and mix for 5-7 minutes until the material is uniform in color.

7. The method for preparing high temperature resistant silica gel according to claim 5, characterized in that: The purpose of the degassing treatment is to remove the bubbles generated during the mixing process to ensure the density of the material. The steps of the degassing treatment are as follows: S1: Equipment preparation, check whether the vacuum degassing machine is working properly; S2: Transfer the mixed silica gel material to a degassing tank, taking care to avoid introducing new bubbles; S3: Start the vacuum pump, observe the pressure change, and record the degassing start time; S4: During the degassing process, gently stir to help the bubbles rise and observe the bubbles disappear; S5: While maintaining the set vacuum degree, record the degassing end time and stop the pump.

8. The method for preparing high temperature resistant silica gel according to claim 5, characterized in that: When preparing the mold, CAD software should be used to design the mold to ensure accurate dimensions, and aluminum alloy or steel with high thermal conductivity should be selected. The steps of preparing the mold are as follows: S1: Cutting and processing molds to ensure the matching accuracy of each component; S2: Polish the mold to ensure a smooth surface; S3: Apply release agent, evenly cover the inner wall of the mold and let it dry. The steps of injection molding are as follows: S1: Check the function of the injection molding machine to ensure there is no fault; S2: Heat the degassed silica gel material to 80-100°C to ensure good fluidity; S3: Inject the material into the mold through the heating pipe to ensure that the temperature remains stable; S4: Set the injection pressure to 0.5-1.0MPa and quickly inject into the mold; S5: Maintain pressure for 5-10 minutes to ensure that the material completely fills the mold.

9. The method for preparing high temperature resistant silica gel according to claim 5, characterized in that: The goal of the curing process is to ensure that the silicone material is completely cured and achieves the required physical properties. The steps of the curing process are as follows: S1: Preheat the oven or curing furnace to the specified temperature; S2: Place the mold after injection molding into the oven to ensure even placement; S3: Record the time of entering the oven and set the curing time to 30-60 minutes; S4: Check the temperature regularly to ensure uniform curing and avoid local overheating.

10. The method for preparing high temperature resistant silica gel according to claim 5, characterized in that: The goal of the demoulding and post-processing is to remove the finished product from the mold and perform necessary post-processing. The steps of the demoulding and post-processing are as follows: S1: After curing is completed, turn off the oven, wait for the mold to cool naturally to room temperature, and carefully disassemble the mold to avoid damage to the finished product; S2: Check the appearance of the finished product, remove excess edges and burrs, and perform surface spraying and grinding as needed.

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