Rubber composition for sealing products as well as preparation method and application of rubber composition

Abstract

The invention discloses a rubber composition for a sealing product as well as a preparation method and application thereof, and relates to the technical field of rubber preparation. According to the rubber composition for the sealing product provided by the invention, the silicon dioxide aerogel is adopted to improve the heat insulation and cold resistance of the rubber sealing product, and meanwhile, carbon black with different specific surface areas is adopted for compounding, so that the possibility of permanent deformation of the rubber sealing product is reduced while the mechanical property of the rubber is improved, and the service life of the rubber sealing product is prolonged. And the rubber sealing product can be further ensured to keep good sealing performance in an outdoor environment. Due to the compounding of the components, the rubber composition has excellent flowability, so that a rubber sealing product can be prepared by using a liquid-phase mixing method, the dispersity of the components is improved, the prepared rubber sealing product has excellent mechanical properties, TR10 can reach-70 DEG C or below, and the compression set is also reduced to 10.2% or below.

Description

Technical Field

[0001] The invention relates to the technical field of rubber preparation, and in particular to a rubber composition for sealing products and a preparation method and application thereof. Background Art

[0002] Sealing and moisture-proofing of power facilities, especially substations, are very important. However, most power facilities tend to work in outdoor environments and often face a large temperature difference between winter and summer. At this time, when the sealing ring in the power facility is not resistant to high and low temperatures, the sealing ring will age and deform rapidly, lose its sealing effect, and then cause the electrical components in the power facility box to get damp, rust, and fall off, which is not conducive to the safe operation of the power grid. In order to solve this problem, it is urgent to develop a rubber product that can maintain good sealing performance in a wide temperature difference range to improve the service life of the sealing ring in outdoor power facilities and the safety of power equipment. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a rubber composition for sealing products, which uses silica aerogel with a rich pore structure to improve the heat insulation and cold resistance of rubber sealing products. At the same time, carbon black with different specific surface areas is compounded to improve the mechanical properties of the rubber while reducing the possibility of permanent deformation, thereby further ensuring that the rubber sealing products can maintain good sealing performance in outdoor environments.

[0004] Another object of the present invention is to provide a method for preparing the rubber composition for sealing products.

[0005] Another object of the present invention is to provide a rubber sealing product.

[0006] Another object of the present invention is to provide a method for preparing a rubber sealing product.

[0007] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0008] A rubber composition for sealing products, comprising the following components calculated by mass:

[0009] 100 parts of ethylene-butadiene rubber, 8-13 parts of high specific surface carbon black, 48-53 parts of low specific surface carbon black, 1-2 parts of carbon black dispersant, 4-6 parts of silica aerogel, 0.4-0.6 parts of coupling agent;

[0010] The specific surface area of ​​the low specific surface carbon black is ≤12m 2 / kg, high specific surface area carbon black ≥70m 2 / kg, the ratio of the specific surface area of ​​the low specific surface carbon black to the high specific surface carbon black is 1:(6-15).

[0011] Existing rubber sealing ring materials often use EPDM as the matrix. Compared with EPDM, the EPDM used in the composition provided by the present invention contains more CH2 side chains on the polymer main chain, which improves the flexibility of the polymer chain segments, allows for larger spaces between polymer chain segments, and improves the ability of the polymer molecular chains to undergo thermal motion, which reduces the possibility of the polymer vitrifying at low temperatures, thereby improving the low-temperature resistance of the rubber sealing product.

[0012] The rubber composition for sealing products provided by the present invention also contains silica aerogel and carbon black of different specific surface areas. Silica aerogel is a solid material with a nanoporous network structure and the pores are filled with a gaseous dispersion medium. The presence of the above-mentioned pore structure effectively reduces heat transfer, plays a role in heat insulation and heat preservation, and can effectively improve the low-temperature and high-temperature resistance of rubber sealing products. However, the silica aerogel is not sufficiently dispersible in the composition system provided by the present invention, so the amount added should not exceed 6 parts, and a coupling agent needs to be added to increase the compatibility between the silica aerogel and other components, but excessive use of the coupling agent will also lead to a decrease in the mechanical properties of the rubber system, so the amount of the coupling agent added should not exceed 0.6 parts.

[0013] The composition provided by the present invention also uses carbon black with different specific surface areas for compounding. The introduction of low specific surface carbon black can prevent permanent deformation of rubber, and the introduction of high specific surface carbon black is to improve the mechanical properties of rubber products, so that even when facing a larger range of temperature differences when used outdoors, it is not easy to fall off due to deformation, further ensuring that rubber sealing products can maintain good sealing performance in outdoor environments. In order to take into account both high mechanical properties and the ability to prevent permanent deformation, 8 to 13 parts of high specific surface carbon black and 48 to 53 parts of low specific surface carbon black should be added to the system, and the specific surface areas of the low specific surface carbon black and the high specific surface carbon black should be ≤12m 2 / kg and ≥70m 2 / kg, and at the same time, a certain proportional relationship is ensured between the specific surface areas of the two carbon blacks. At the same time, since carbon black is an inorganic filler, its dispersibility in the composition system of the present invention is also insufficient, so 1 to 2 parts of carbon black dispersant need to be added to ensure good dispersion of carbon black in the system.

[0014] In a specific embodiment of the present invention, the high specific surface carbon black can be at least one of N326 carbon black, N335 carbon black, N339 carbon black, N347 carbon black, N351 carbon black, N582 carbon black, and N356 carbon black, and the low specific surface carbon black can be at least one of N908 carbon black, N907 carbon black, and N991 carbon black.

[0015] In a specific embodiment of the present invention, the carbon black dispersant may be DC-01T.

[0016] Preferably, the specific surface area of ​​the silica aerogel is 800 to 850 m 2 / g.

[0017] Preferably, the coupling agent is a silane coupling agent. More preferably, the silane coupling agent is bis-[3-(triethoxysilyl)propyl]-disulfide (SI-75). Common coupling agents used to improve the dispersibility of silica in rubber are silane coupling agents SI-69 and SI-75, among which silane coupling agent SI-75 can make silica have higher dispersibility and higher processing safety temperature, so coupling agent SI-75 is preferred.

[0018] The present invention also protects a method for preparing the rubber composition for sealing products, comprising the following steps:

[0019] S1. Dispersing each component in water in proportion and mixing to obtain an emulsion composition;

[0020] S2. The composition emulsion obtained in step S1 is mixed with a flocculant, allowed to stand, separated and precipitated, and then dried and molded to obtain a rubber composition for sealing products.

[0021] The preparation method of the rubber composition for sealing products provided by the present invention belongs to a liquid phase mixing method, which mixes the components in the rubber system in a liquid state, so that the components can be dispersed more fully and evenly to obtain a composition with better performance.

[0022] Preferably, step S1 is to disperse the components in water at a temperature of 40-50°C.

[0023] Preferably, in step S1, low specific surface carbon black, carbon black dispersant, high specific surface carbon black, silica aerogel and coupling agent are dispersed in water in sequence, the above components are fully mixed under stirring conditions at a speed of 150 to 220 rpm, and then the remaining components are added and the mixing is continued to obtain a composite emulsion.

[0024] In a specific embodiment of the present invention, the remaining component is ethylene-butyl rubber. The method of adding in batches can make the components in the composition emulsion dispersed more evenly.

[0025] Preferably, in step S1, after mixing low specific surface carbon black, carbon black dispersant, high specific surface carbon black, silica aerogel and coupling agent, the rotation speed is reduced to 50-100 rpm, and after adding the remaining components, the rotation speed is increased to 150-220 rpm, and mixing is continued to obtain a composite emulsion.

[0026] More preferably, in step S1, first disperse the low specific surface carbon black and the carbon black dispersant in water, and stir at 60 rpm for 2 min; then add the high specific surface carbon black, and stir at 60 rpm for 2 min; then add the silica aerogel and the coupling agent, stir at 60 rpm for 2 min, increase the speed to 180 rpm, stir for 30 min, reduce the speed to 60 rpm, add ethylene-butadiene rubber, stir for 10 min, increase the speed to 180 rpm, and stir for 60 min to obtain a composite emulsion.

[0027] The process of first dispersing at a low speed and then mixing at a high speed can produce a higher quality rubber composition. If the speed is adjusted to be higher than 60 rpm after adding the components in batches, the aging resistance of the rubber will be affected. If the speed is too low, the fluidity of the system is poor and the components are easily dispersed unevenly.

[0028] In a specific embodiment of the present invention, the flocculant used in step S2 can be calcium chloride. More specifically, the mass fraction of calcium chloride is 0.7-1 part.

[0029] In a specific embodiment of the present invention, in step S2, the composition emulsion and the flocculant are mixed and then allowed to stand for 5 to 6 hours until the system is separated into layers.

[0030] In a specific embodiment of the present invention, in step S2, the composition emulsion and the flocculant are mixed evenly, and after standing until the system is separated into layers, the mixture is filtered through a filter with a pore size of 0.2 mm to obtain a precipitate.

[0031] In a specific embodiment of the present invention, step S2 further comprises the step of washing the precipitate after separation, and more specifically, the washing is performed twice with water.

[0032] In a specific embodiment of the present invention, the drying in step S2 is to place the precipitate in an environment of 105-115° C. and dry it for 5-8 minutes.

[0033] In a specific embodiment of the present invention, the forming in step S2 is performed by tabletting using an open mill, and more specifically, the roller spacing of the open mill is 5 to 8 mm.

[0034] The present invention also protects a rubber sealing product, comprising the rubber composition for sealing products and other additives, wherein the other additives include at least one of zinc oxide, stearic acid, an antioxidant, and a vulcanizing agent.

[0035] Preferably, the rubber sealing product comprises the following components calculated by mass:

[0036] 140-200 parts of rubber composition for sealing products, 2-8 parts of zinc oxide, 0.5-1.5 parts of stearic acid, 2-4 parts of antioxidant, and 2-4 parts of vulcanizing agent.

[0037] More preferably, the antioxidant includes at least one of 2-mercaptobenzimidazole and 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine.

[0038] Different antioxidants have different protective effects, and different rubbers also require specific types of antioxidants. Otherwise, the rubber will age easily, causing the sealing ring's low-temperature resistance to drop sharply.

[0039] Antioxidant 445, namely 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, has good protective effect against aging caused by light, heat, ozone, etc., and also has a certain passivation effect on variable metals and heavy metals. Antioxidant MB (2-mercaptobenzimidazole) has protective effect against oxygen, weather aging and static aging. Adding two antioxidants can produce a synergistic effect.

[0040] More preferably, the mass ratio of the 2-mercaptobenzimidazole to 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine is (1-3):1.

[0041] More preferably, the vulcanizing agent is dicumyl peroxide.

[0042] Peroxide DCP vulcanizer can generate cross-linked structures by reacting with active groups (such as double bonds, hydroxyl groups, etc.) in rubber, thereby increasing the strength, tensile properties, wear resistance and tear resistance of rubber. At the same time, it can also improve the heat resistance, aging resistance and corrosion resistance of rubber. In addition to improving physical properties, the DCP vulcanization system can also significantly improve the heat resistance and aging resistance of rubber.

[0043] The present invention also protects a method for preparing the above-mentioned rubber sealing product, comprising the following steps:

[0044] The rubber composition for sealing products is mixed with other additives and kneaded to obtain rubber sealing products.

[0045] In a specific embodiment of the present invention, the above mixing comprises the following steps:

[0046] (1) The roll temperature of the open mill is adjusted to 70° C., the roll distance is adjusted to 7-8 mm, and the rubber composition for sealing products is plasticized. After the rubber is wrapped around the roll, the sheet is removed after mixing for 1 minute;

[0047] (2) Adjust the roller distance to 4-5 mm, first wrap the rubber composition for sealing products with the roller, control a certain amount of rubber accumulation, first add zinc oxide and stearic acid, and then add antioxidant and vulcanizing agent after the powder is gradually absorbed. After the powder is completely absorbed, roll it three times with the knife, and then roll it three times with the triangle package before unrolling;

[0048] (3) Adjust the roller distance to 1-2mm, roll the mixed rubber, make a triangle package three times, and roll it three times. Adjust the roller distance to 5-8mm and stop the sheet to obtain the rubber sealing product.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The rubber composition provided by the present invention has excellent fluidity, and a liquid phase mixing method can be used to prepare rubber sealing products, thereby improving the dispersibility of each component. The prepared rubber sealing products have excellent properties, with a tensile strength of more than 19.1 MPa, a Shore hardness of more than 63A, an elongation at break of 302%, and a TR10 of less than -70°C, indicating excellent cold resistance; and the compression permanent deformation is also reduced to less than 10.2%, indicating that the rubber sealing products have excellent ability to prevent permanent deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a SEM image of the rubber sealing product provided in Example 1 of the present invention.

[0052] Figure 2 This is a SEM image of the rubber sealing product provided in Example 15 of the present invention. DETAILED DESCRIPTION

[0053] The present invention is further described below in conjunction with specific embodiments, but the embodiments do not limit the present invention in any form. Unless otherwise specified, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents. Among them, the raw material information used in each embodiment and comparative example is as follows:

[0054] Antioxidant MB: 2-mercaptobenzimidazole, CAS: 583-39-1.

[0055] Antioxidant 445: 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine, CAS: 10081-67-1.

[0056] Curing agent DCP: dicumyl peroxide, CAS: 80-43-3.

[0057] Coupling agent SI-75: bis-[3-(triethoxysilyl)propyl]-disulfide, CAS: 56706-10-6.

[0058] N991 carbon black: Cabot Chemical Co., Ltd., low specific surface area carbon black N991, specific surface area: 8.2m 2 / kg.

[0059] N326 carbon black: Cabot Chemical Co., Ltd., high specific surface area carbon black N326, specific surface area: 78.9m 2 / kg.

[0060] N339 carbon black: Cabot Chemical Co., Ltd., high specific surface area carbon black N326, specific surface area: 91.3m 2 / kg.

[0061] N356 carbon black: Tianjin Yihuachang New Material Technology Co., Ltd., high specific surface area carbon black N356, specific surface area: 91.5m 2 / kg.

[0062] N907 carbon black: Kencabo Co., Ltd., Thermax 907, specific surface area: 9.4m 2 / kg.

[0063] N908 carbon black: Kencabo Co., Ltd., Thermax 908, specific surface area: 9.8m 2 / kg.

[0064] N642 carbon black: Tianjin Yihuachang New Material Technology Co., Ltd. N642 carbon black, specific surface area: 39.8m 2 / kg.

[0065] N650 carbon black: Cabot Chemical Co., Ltd. N650 carbon black, specific surface area: 36.6m 2 / kg.

[0066] N134 carbon black: Cabot Chemical Co., Ltd. V10H (N134), specific surface area: 143.2m 2 / g.

[0067] Silica aerogel: Jiangsu Jiayun New Materials Co., Ltd., specific surface area: 825m 2 / g.

[0068] Carbon black dispersant: Otsuka Chemical Management (Shanghai) Co., Ltd., Acroad DC-01T.

[0069] Examples 1 to 7

[0070] This embodiment provides a method for preparing a rubber composition for sealing products having a series of components and different mass fractions thereof, comprising the following steps:

[0071] S1. First disperse low specific surface carbon black and carbon black dispersant in water at 45°C, and stir at 60rpm for 2min; then add high specific surface carbon black, and stir at 60rpm for 2min; then add silica aerogel and coupling agent, stir at 60rpm for 2min, increase the speed to 180rpm, stir for 30min, reduce the speed to 60rpm, add ethylene-butadiene rubber, stir for 10min, increase the speed to 180rpm, and stir for 60min to obtain a composite emulsion;

[0072] S2. Mix the composition emulsion obtained in step S1 with 0.8 parts of flocculant calcium chloride, stir for 15 minutes to mix, let stand for 5 hours, filter the precipitate with a filter screen with a pore size of 0.2 mm, dry at 100°C for 6 minutes, and then use an open mill to press the precipitate into sheets. The spacing between the rollers of the open mill is 6 mm. After pressing, a rubber composition for sealing products can be obtained.

[0073] The specific components and their mass fractions in Examples 1 to 7 are shown in Table 1 below:

[0074] Table 1. Specific components and their mass fractions in Examples 1 to 7

[0075]

[0076] Note: In Table 1 above, if the specific type of carbon black is not specified, the description is consistent with that in Example 1.

[0077] Comparative Examples 1 to 7

[0078] This comparative example provides a series of rubber compositions for sealing products having different components and different mass fractions. The preparation method of the rubber composition in each comparative example is consistent with that in Example 1.

[0079] The specific components and their mass fractions in Comparative Examples 1 to 7 are shown in Table 2 below:

[0080] Table 2. Specific components and their mass fractions in Comparative Examples 1 to 7

[0081]

[0082]

[0083] Note: In Table 2 above, if the specific type of carbon black is not specified, the description is consistent with that of Comparative Example 1.

[0084] Performance Testing

[0085] Next, the rubber compositions obtained in the examples and comparative examples were prepared into rubber sealing products, and the components in Example 1 were also prepared into rubber sealing products by dry mixing, to explore the effects of specific components, mass fractions and mixing methods on the performance of rubber sealing products.

[0086] Effect Examples 1 to 14

[0087] 166.5 parts of the rubber composition obtained in Examples 1 to 7 or Comparative Examples 1 to 7, 5 parts of zinc oxide, 1 part of stearic acid, 2 parts of antioxidant MB, 1 part of antioxidant 445, and 3.2 parts of vulcanizing agent DCP were mixed and kneaded to obtain rubber sealing products. Among them, Effect Examples 1 to 7 are rubber sealing products made from the rubber compositions obtained in Examples 1 to 7 of the present invention as master batches; Effect Examples 8 to 14 are rubber sealing products made from the rubber compositions obtained in Comparative Examples 1 to 7 of the present invention as master batches.

[0088] Effect Example 15

[0089] This embodiment provides a method for preparing a rubber sealing product by dry mixing, comprising the following steps:

[0090] 100 parts of ethylene-butadiene rubber, 5 parts of zinc oxide, 1 part of stearic acid, 2 parts of antioxidant MB, 1 part of antioxidant 445, 50 parts of N991 carbon black, 10 parts of N326 carbon black, 5 parts of silica aerogel, 0.5 parts of coupling agent SI-75 and 3.2 parts of vulcanizing agent DCP are mixed and kneaded to obtain a rubber sealing product.

[0091] The specific performance test data of the above effect examples are as follows: Tables 3 to 4 Figures 1-2 As shown:

[0092] Table 3. Specific performance test data of effect examples 1 to 14

[0093]

[0094]

[0095] Table 4. Specific performance test data of effect example 1 and effect example 15

[0096] Test items Effect Example 1 Effect Example 15 Minimum torque ML 0.19 0.26 Maximum torque MH 15.01 14.29 TS2 1.52 1.48 TC10 1.27 1.17 TC90 1.32 12.29 MH-ML 14.82 14.03 Carbon black dispersion % 98.7 91

[0097] It should be noted that what is measured in Table 3 above is the performance of rubber sealing products, and what is measured in Table 4 is the fluidity of the rubber during mixing. The minimum torque ML and the carbon black dispersion rate reflect the flow properties of the rubber. The smaller the ML and the higher the dispersion rate, the better the flow properties.

[0098] As can be seen from Table 4 above, the rubber composition provided by the present invention can improve fluidity based on a specific formulation, so it can be mixed by liquid phase mixing. During mixing, ML, MH, TS2 (the time corresponding to when the curve rises from the minimum torque by 0.2 N·m from the start of the experiment), TC10 (scorch time, the time required for the rubber material to reach 10% of the maximum torque from the start of heating), TC90 (the time required for the rubber material to reach 90% of the maximum torque from the start of heating), MH-ML (the difference between the maximum and minimum torques, reflecting the degree of crosslinking, the larger the difference, the higher the degree of crosslinking) and other properties are better than those of the rubber material mixed by dry mixing, while Figures 1-2 It is also confirmed that the liquid phase mixing method can improve the dispersion performance of the rubber, which is beneficial for silica aerogel to improve the mechanical properties and cold resistance of rubber.

[0099] As can be seen from Table 3, due to the specific formula and mixing method, the rubber composition provided by the present invention has good dispersibility, and the rubber sealing products prepared therefrom also have excellent various properties, the tensile strength reaches more than 19.1MPa, the Shore hardness reaches more than 63A, the elongation at break reaches 302%, and TR10 can reach below -70°C, indicating excellent cold resistance; the compression permanent deformation is also reduced to less than 10.2%, indicating that it has excellent ability to prevent permanent deformation. Among them, according to the data of effect examples 1 to 3 (corresponding to embodiments 1 to 3) and effect examples 8 to 9 (corresponding to comparative examples 1 to 2), it can be seen that in the rubber composition provided by the present invention, the number of high-specific carbon black is controlled to be 8 to 13 parts and the number of low-specific carbon black is controlled to be 48 to 53 parts, so as to obtain a rubber sealing product with both excellent mechanical properties and cold resistance. Whether the number of low-specific carbon black accounts for too much (Comparative Example 1) or the number of high-specific carbon black is too much (Comparative Example 2), the purpose of the present invention cannot be achieved. At the same time, according to effect examples 10 to 11 (corresponding to comparative examples 3 to 4), it can be seen that the amount of silica aerogel added will also affect the performance of the rubber sealing product in the present invention. According to effect examples 1, 4 to 7 and 12 to 14 (corresponding to embodiments 1, 4 to 7 and comparative examples 5 to 7, respectively), the ratio of the specific surface area of ​​low specific surface carbon black to that of high specific surface carbon black in the composition provided by the present invention needs to satisfy a ratio of 1: (6 to 15) to ensure that the obtained sealing product has both excellent mechanical properties and cold resistance. Otherwise, the carbon blacks of different specific surface areas cannot exhibit a suitable synergistic effect, resulting in insufficient improvement in the performance of the rubber system.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A rubber composition for sealing products, characterized in that: It includes the following components calculated by mass: 100 parts of ethylene-butadiene rubber, 8-13 parts of high specific surface carbon black, 48-53 parts of low specific surface carbon black, 1-2 parts of carbon black dispersant, 4-6 parts of silica aerogel, 0.4-0.6 parts of coupling agent; The specific surface area of ​​the low specific surface carbon black is ≤12m 2 / kg, high specific surface area carbon black ≥70m 2 / kg, the ratio of the specific surface area of ​​the low specific surface carbon black to the high specific surface carbon black is 1:(6-15).

2. The rubber composition for sealing products according to claim 1, characterized in that: The specific surface area of ​​the silica aerogel is 800 to 850 m 2 / g.

3. The method for preparing the rubber composition for sealing products according to claim 1 or 2, characterized in that: The steps include: S1. Dispersing each component in water in proportion and mixing to obtain an emulsion composition; S2. The composition emulsion obtained in step S1 is mixed with a flocculant, allowed to stand, separated and precipitated, and then dried and molded to obtain a rubber composition for sealing products.

4. The method for preparing a rubber composition for sealing products according to claim 3, characterized in that: Step S1: Disperse the components in water at a temperature of 40-50°C.

5. The method for preparing a rubber composition for sealing products according to claim 3, characterized in that: Step S1: disperse low specific surface carbon black, carbon black dispersant, high specific surface carbon black, silica aerogel and coupling agent in water in sequence, fully mix the above components under stirring conditions at a speed of 150-220 rpm, add the remaining components, and continue mixing to obtain a composite emulsion.

6. The method for preparing a rubber composition for sealing products according to claim 5, characterized in that: In step S1, after low specific surface carbon black, carbon black dispersant, high specific surface carbon black, silica aerogel and coupling agent are mixed, the rotation speed is reduced to 50-100 rpm, and after the remaining components are added, the rotation speed is increased to 150-220 rpm, and the mixing is continued to obtain a composite emulsion.

7. A rubber sealing product, characterized in that: The invention comprises the rubber composition for sealing products as claimed in claim 1 or 2 and other additives, wherein the other additives include at least one of zinc oxide, stearic acid, an antioxidant and a vulcanizing agent.

8. The rubber sealing product according to claim 7, characterized in that: It includes the following components calculated by mass: 140-200 parts of the rubber composition for sealing products according to claim 1 or 2, 2-8 parts of zinc oxide, 0.5-1.5 parts of stearic acid, 2-4 parts of antioxidant, and 2-4 parts of vulcanizing agent.

9. The rubber sealing product according to claim 8, characterized in that: The antioxidant includes at least one of 2-mercaptobenzimidazole and 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine.

10. The method for preparing the rubber sealing product according to any one of claims 7 to 9, characterized in that: The steps include: The rubber composition for sealing products according to claim 1 or 2 is kneaded with other additives to obtain the rubber sealing product.

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