Low-compression-set silicone rubber composition having high-temperature durability, and rubber product

Abstract

The present invention relates to a low-compression-set silicone rubber composition having high-temperature durability, and a rubber product. The silicone rubber composition comprises: (A) basic silicone oil, which comprises silicone oil with vinyl groups at both ends (vinyl silicone oil I) having a viscosity of 10,000-100,000 mPa·s, silicone oil with a vinyl group at the side chain thereof (vinyl silicone oil II) having a viscosity of 500-20,000 mPa·s, and silicone oil with vinyl groups at the end and side chain thereof (vinyl silicone oil III) having a viscosity of 5,000-20,000 mPa·s; (B) a compound modified by using a sulfur-containing silane compound; (C) hydrogen-containing silicone oil; and (D) a noble metal catalyst.

Description

Low compression set silicone rubber composition with high temperature durability and rubber article TECHNICAL FIELD

[0001] The present application relates to a low compression set silicone rubber composition with high temperature durability and rubber article. BACKGROUND

[0002] Liquid silicone rubber has good performance, good resilience, easy to mass processing, so it has been widely used in the automotive industry. But with the development of energy saving and low pollution of the automobile, in recent years the temperature of the engine has increased by 15-50℃, at the same time people's requirements for the safety, environmental protection, comfort, intelligence and other aspects of the automobile are also getting higher and higher. It is required to ensure the stable operation of the automobile equipment and to ensure the waterproof performance of the automobile equipment during work. Under this condition, new requirements are put forward for the performance of silicone rubber: excellent high temperature durability, low compression set after heat aging, so as to realize good sealing performance. WO2019 / 175092A1 mentions that silicone rubber in American cars is divided into T3, T4, T5 grades according to durability. At present, most of the silicone rubber meets the T3 grade, in order to reach T4 and T5 grade, the material needs better high temperature resistance and compression set performance of durability.

[0003] The general method of improving the compression set performance of silicone rubber in the prior art is: (1) adding heat-resistant additives such as iron oxide, cerium oxide, etc. in the silicone rubber to capture free radicals generated at high temperature, so as to avoid the attack of free radicals on polysiloxane molecular chain, and improve the heat resistance stability of the material; (2) adding unsaturated bond containing or nitrogen and sulfur containing additives such as benzotriazole, melamine urate, etc. to neutralize the unreacted platinum catalyst after crosslinking reaction, so as to reduce the secondary crosslinking reaction in the high temperature aging process. But these methods still have some deficiencies, such as expensive heat-resistant additives and color, and in the platinum catalyzed liquid silicone rubber system, nitrogen and sulfur compounds additives will also affect the vulcanization and yellowing of silicone rubber.

[0004] CN115895271A uses nano cerium oxide and metal oxides such as cerium hydroxide to prepare a low compression set liquid silicone rubber. After aging at 180℃×22h, 25% volume compression, the compression set is ≤15%.

[0005] US5977249 uses silane containing sulfur group to treat white carbon black, and applies it to platinum gold system, and gets a transparent and low compression set liquid silicone rubber product. But the compression set of the product is tested at 175℃×22h, and the final product compression set is <50%.

[0006] The reported improvement methods mainly target the short-term compression set after aging, such as (170-180℃) x 22h. However, it is found that the material with excellent short-term compression set does not necessarily perform well after durability test. There are many factors causing the aging of silicone rubber. The internal factor is the chemical reaction between the unsaturated structure in the molecular structure of silicone rubber and active oxygen atoms, thereby destroying the structure of silicone rubber. Oxygen, ozone, heat, light, stress and other chemical and physical factors are external factors that accelerate the aging of silicone rubber. During the compression set test process, the material applies external force, which limits the movement of molecular chains, and reduces the oxygen permeability. Due to the complexity of the aging mechanism, there is no clear mechanism to show what changes occur during the aging process, but some scholars have studied different rubbers, and the results show that there are differences in crosslinking mechanism at different aging stages; some are mainly crosslinked in the early stage of aging, and mainly cracked in the later stage of aging, and some are the opposite. Due to the difference in mechanism at different aging stages, the short-term aging performance cannot represent the long-term aging performance. SUMMARY

[0007] The inventors found that the material with excellent compression set in short-time aging (177℃ x 22h) does not necessarily have excellent compression set at 140℃ x 1000h.

[0008] The present application is completed in view of the problems of the prior art, and aims to provide a self-oil-bleeding silicone rubber composition with high-temperature durability and low compression set, and a rubber product.

[0009] The inventors found that by using a specific structure of vinyl silicone oil and a complex modified with a sulfur-containing silane compound in the silicone rubber composition, and controlling the ratio of silicon hydride to vinyl group, the above technical problems can be solved, and the present application is completed.

[0010] Specifically, the present application provides:

[0011] 1. A silicone rubber composition comprising:

[0012] (A) a base silicone oil comprising: a double-end vinyl silicone oil (vinyl silicone oil I) with a viscosity of 10000-100000 mPa-s, a side-chain vinyl silicone oil (vinyl silicone oil II) with a viscosity of 500-20000 mPa-s, and an end-side vinyl silicone oil (vinyl silicone oil III) with a viscosity of 5000-20000 mPa-s, in an amount of 100 parts by mass;

[0013] (B) a complex modified with a sulfur-containing silane compound, in an amount of 0.05-0.5 parts by mass;

[0014] (C) a hydrogen-containing silicone oil in an amount such that the number of silicon-hydrogen bonds / number of vinyl groups in the silicone rubber composition = 1.2-1.5;

[0015] (D) a noble metal catalyst in an amount of 1-35 ppm by weight of the noble metal.

[0016] 2. The silicone rubber composition according to 1, further comprising at least one of the following: an inhibitor and a filler.

[0017] 3. The silicone rubber composition according to 1, wherein in 100 parts by mass of the above base silicone oil,

[0018] the vinyl silicone oil I is 60-98 parts;

[0019] the vinyl silicone oil II is 1-20 parts;

[0020] the vinyl silicone oil III is 1-20 parts.

[0021] 4. The silicone rubber composition according to 1, wherein the above base silicone oil further comprises a phenyl silicone oil.

[0022] 5. The silicone rubber composition according to 1, wherein the above terminal vinyl silicone oil has a vinyl content of 1-20 wt%.

[0023] 6. The silicone rubber composition according to 1, wherein the composition comprises at least one of the following: a silicone powder, a clay, calcium carbonate, white carbon, aluminum hydroxide, magnesium hydroxide, a silicone oil, and a silicone resin.

[0024] 7. A rubber product prepared using the silicone rubber composition according to any one of the above 1-6.

[0025] Inventive Effects

[0026] The silicone rubber composition according to the present application has excellent compression set properties, and can reduce the compression set at 140°C x 1000 h to within 30%. The rubber does not use expensive and easily colored heat-resistant additives, and can reduce the compression set after long-term aging, and has the advantages of being colorless and low cost. The silicone rubber composition has a fast curing speed, and the additives used in the formulation have little effect on the curing within a wide range of addition amounts, and has wide process adaptability. The silicone rubber composition does not require two-stage curing, and can achieve low compression set durability. DETAILED DESCRIPTION

[0027] (Silicone Rubber Composition)

[0028] The silicone rubber composition of the present application comprises: (A) a base silicone oil, (B) a complex modified with a sulfur-containing silane compound, (C) a hydrogen-containing silicone oil, and (D) a noble metal catalyst. By using a specific structure vinyl silicone oil and a complex modified with a sulfur-containing silane compound in the silicone rubber composition, and controlling the ratio of silicon hydride to vinyl group, excellent compression set performance can be maintained even after long time high temperature aging.

[0029] Each component of the silicone rubber composition of the present application will be described in detail below.

[0030] (Base silicone oil)

[0031] The silicone rubber composition of the present application comprises a base silicone oil. The base silicone oil comprises: a double-end vinyl silicone oil (hereinafter sometimes referred to as vinyl silicone oil I or first vinyl silicone oil) having a viscosity of 10,000 to 100,000 mPa-s, a side-chain vinyl silicone oil (hereinafter sometimes referred to as vinyl silicone oil II or second vinyl silicone oil) having a viscosity of 500 to 20,000 mPa-s, and an end-side vinyl silicone oil (hereinafter sometimes referred to as vinyl silicone oil III or third vinyl silicone oil) having a viscosity of 5,000 to 20,000 mPa-s. The vinyl group content of the vinyl silicone oil III is preferably 1 to 20 wt%.

[0032] (Vinyl silicone oil I)

[0033] The vinyl silicone oil I is a double-end vinyl silicone oil having a double-end vinyl structure. It has a viscosity of 10,000 to 100,000 mPa-s at 25°C, more preferably 20,000 to 80,000 mPa-s, and most preferably 20,000 to 60,000 mPa-s. Any silicone oil having a double-end vinyl structure and a viscosity within the above range can be used.

[0034] The vinyl group can also be replaced with propenyl group, 3-butenyl group, 5-hexenyl group, 9-decenyl group, 10-undecenyl group, 5,9-decadienyl group, 6,11-dodecadienyl group, and the like.

[0035] The vinyl silicone oil I can have a linear, branched, cyclic, or network structure.

[0036] As examples of the vinyl silicone oil I, the following can be listed:

[0037] - a polydimethylsiloxane having a dimethylvinylsilyl end group.

[0038] As one embodiment, the vinyl silicone oil I can have the following structural formula:

[0039] wherein n is an integer.

[0040] The viscosity described in the present application is a value obtained by measurement with a rotational viscometer at 25°C.

[0041] The vinyl silicone oil I mainly functions to build a crosslinked network, provide elasticity and toughness of the rubber in the silicone rubber composition. The content thereof is 60 to 98 wt%, preferably 80 to 98 wt%, more preferably 85 to 95 wt% based on 100 mass parts of the base silicone oil.

[0042] The vinyl silicone oil I can use a commercially available product known in the art or a product prepared by a method known in the art. The vinyl silicone oil I can be used alone or two or more kinds thereof can be mixed and used.

[0043] (Vinyl silicone oil II)

[0044] The vinyl silicone oil II is a side chain vinyl silicone oil having a structure in which a side chain has a vinyl group, and has a viscosity of 500 to 20,000 mPa-s, preferably 1,000 to 10,000 mPa-s, more preferably 2,000 to 5,000 mPa-s. As long as it is a silicone oil having at least one vinyl group in a side chain in one molecule and having a viscosity within the above range, it can be used.

[0045] The vinyl group can also be replaced with a group of propenyl group, 3-butenyl group, 5-hexenyl group, 9-decenyl group, 10-undecenyl group, 5,9-decadienyl group, and 6,11-dodecadienyl group.

[0046] As examples of the vinyl silicone oil III, the following can be listed:

[0047] - terminal methyl side methyl side vinyl silicone oil.

[0048] As one embodiment, the vinyl silicone oil III can have the following structural formula:

[0049] wherein n and m are each an integer.

[0050] The vinyl silicone oil II mainly functions to provide a concentrated crosslinking point and improve the strength in the silicone rubber composition. The content thereof is 1 to 20 wt%, preferably 2 to 15 wt%, more preferably 2 to 10 wt% based on 100 mass parts of the base silicone oil.

[0051] The vinyl silicone oil II can use a commercially available product known in the art or a product prepared by a method known in the art. The vinyl silicone oil II can be used alone or two or more kinds thereof can be mixed and used.

[0052] (Vinyl silicone oil III)

[0053] Vinyl silicone oil III is a terminal vinyl silicone oil having at least one end capped with a vinyl group and a side chain having a vinyl group, and has a viscosity of 5,000 to 20,000 mPa-s, more preferably 10,000 to 19,000 mPa-s. As long as a silicone oil having the above structure and having a viscosity within the above range is used, it can be used.

[0054] The vinyl group can also be replaced with a propenyl group, a 3-butenyl group, a 5-hexenyl group, a 9-decenyl group, a 10-undecenyl group, a 5,9-decadienyl group, and a 6,11-dodecadienyl group.

[0055] As examples of the vinyl silicone oil III, the following can be given:

[0056] - a terminal vinyl side methyl vinyl silicone oil.

[0057] As one embodiment, the vinyl silicone oil III can have the following structural formula:

[0058] wherein n and m are each an integer.

[0059] Vinyl silicone oil III is a key material of the silicone oil system of the present application. By adding vinyl silicone oil III, a low compression set property of durability can be achieved. By using silicone oils having different structures / viscosities and vinyl contents, a crosslinked network of elasticity can be achieved. The content is 1 to 20 wt% based on 100 parts by mass of the base silicone oil, preferably 1 to 15 wt%, more preferably 1 to 5 wt%. Furthermore, the vinyl content of the vinyl silicone oil III is 1 to 20 wt%. When the vinyl content of the vinyl silicone oil III is higher than 20 wt%, the vinyl group as an unsaturated bond coordinates with the metal contained in the catalyst, inhibiting the catalytic efficiency of the catalyst, and the vulcanization speed of the system is reduced, and too much vinyl group leads to too concentrated crosslinking and high unreacted rate, and more vinyl groups remain in the system after hot vulcanization, which provides more reaction sites in the subsequent heat aging process, and the double bond unsaturated structure of the vinyl group has poor aging resistance, deteriorating the compression set property. When it is lower than 1 wt%, the crosslinked network of the system is difficult to form a crosslinked network of sparse and dense combination, and the crosslinking points are insufficient, resulting in low elasticity and poor compression set of the system. More preferably, the vinyl content is 1 to 8 wt%, and further preferably 2 to 4 wt%.

[0060] The vinyl silicone oil III can use commercially available products known in the art or products prepared by methods known in the art. The vinyl silicone oil III can be used alone or in a mixture of two or more.

[0061] The above-mentioned vinyl silicone oils I, II, and III can also be substituted with various substituents known in the art, and can contain various groups known in the art in the main chain and side chain, within a range that does not affect the effects of the present application.

[0062] (phenyl silicone oil)

[0063] The silicone rubber composition of the present application can optionally further comprise a phenyl silicone oil.

[0064] The phenyl silicone oil is a silicone oil having at least one phenyl group in one molecule, which is distinguished from the above-mentioned base silicone oil in that it does not contain an unsaturated group in the molecule.

[0065] The phenyl silicone oil mainly functions as a lubricant in the silicone rubber composition. The viscosity of the phenyl silicone oil can be 50 to 300 cs, preferably 80 to 250 cs. The content thereof can be 1 to 8 wt% based on 100 parts by mass of the base silicone oil.

[0066] As examples of the phenyl silicone oil, the following can be mentioned:

[0067] wherein m, n are each an integer.

[0068] The phenyl silicone oil can use a commercially available product known in the art or a product prepared by a method known in the art. The phenyl silicone oil can be used alone or two or more kinds can be mixed and used.

[0069] (composite modified with sulfur-containing silane compound)

[0070] The composite modified with a sulfur-containing silane compound of the present application is a composite obtained by modifying with a sulfur-containing silane compound, including but not limited to, silica powder, clay, calcium carbonate, white carbon, aluminum hydroxide, magnesium hydroxide, silicone oil, silicone resin, etc. The addition ratio of the composite modified with a sulfur-containing silane compound can be 0.05 to 0.5 wt% based on the base silicone oil. This component is an important component for improving the durability of low compression set. The sulfur-containing group (e.g., mercapto, thiocyanogen, sulfoxide, sulfone, sulfide group, disulfide group, or tetrasulfide group, etc.) in the sulfur-containing silane compound can effectively inhibit the reaction activity of the catalyst during long-term aging, reduce the secondary reaction during aging, and improve the compression set, but the addition needs to be appropriate. If the proportion of the sulfur-containing group is insufficient, it cannot have the expected effect, but too much has an adverse effect on the system. The catalyst is sensitive to sulfur-, nitrogen-, and phosphorus-containing compounds and is easily poisoned. Too much sulfur-containing group will inhibit the vulcanization of the catalyst system. Therefore, the addition ratio thereof can be 0.05 to 0.5 wt%, preferably 0.1 to 0.5 wt%, more preferably 0.2 to 0.4 wt%. The proportion of the sulfur-containing group in the composite modified with a sulfur-containing silane compound can be 0.2 x 10 -4 -4 x 10 -3 mol / g.

[0071] The sulfur-containing silane-treated composite can be obtained by uniformly mixing the sulfur-containing silane with silica powder, clay, calcium carbonate, white carbon black, aluminum hydroxide, magnesium hydroxide, silicone oil, silicone resin, etc. under heating and stirring and then solidifying, or a commercially available product can be used.

[0072] The above-mentioned sulfur-containing silane can be used as long as it is a silane having at least one sulfur-containing group in one molecule.

[0073] As the above-mentioned sulfur-containing silane, X b [R 2 a Si(OR 1 ) 4-a ] c .

[0074] wherein R 1 each independently is an alkyl group having 1 to 10 carbons, such as methyl, ethyl, propyl, butyl, etc.;

[0075] R 2 each independently is an alkyl group having 1 to 10 carbons, such as methyl, ethyl, propyl, butyl, etc., when R 1 or R 2 is an alkylene group when connected to X;

[0076] X is a sulfur-containing group, such as a mercapto group, a thiocyanato group, a sulfoxide group, a sulfone group, a sulfide group, a disulfide group, a tetrasulfide group, etc.;

[0077] a is an integer of 1 to 3, b is an integer of 1 to 3, and c is an integer of 1 to 3.

[0078] As specific examples thereof, the following can be mentioned:

[0079] The sulfur-containing silane can be used alone or in a mixture of two or more. The sulfur-containing silane can be commercially available or obtained by a conventional preparation method.

[0080] The above-mentioned silica powder can use a silica powder having an average particle diameter of 20 to 40 micrometers. Specifically, a silica powder having a trade name of PGH (300 mesh) can be used.

[0081] The above-mentioned clay can use a clay having an average particle diameter of 40 to 60 micrometers. Specifically, a clay having a trade name of DB-80 (manufactured by Shanxi Jinyu Kelin Technology Co., Ltd.) can be used.

[0082] The above-mentioned calcium carbonate can use a calcium carbonate having an oil absorption value (g / 100 g) of ≤ 100. Specifically, a calcium carbonate having a trade name of Active Calcium Carbonate (manufactured by Changzhou Calcium Carbonate Co., Ltd.) can be used.

[0083] The above-mentioned white carbon black can use a white carbon black having a specific surface area of 150 to 300 m2 Specifically, a white carbon black with a trade name of H300 (Cabot) can be used.

[0084] The above-mentioned aluminum hydroxide can use an aluminum hydroxide with an average particle diameter of 2-100 micrometers. Specifically, an aluminum hydroxide with a trade name of TL01-1 (Unistar) can be used.

[0085] The above-mentioned magnesium hydroxide can use a magnesium hydroxide with an average particle diameter of 2-100 micrometers. Specifically, a magnesium hydroxide with a trade name of TM01-1 (Unistar) can be used.

[0086] The above-mentioned silicone oil can use a vinyl silicone oil. Specifically, a silicone oil with a trade name of 621V10000 (Jiangxi Xinghuo Silicone) can be used.

[0087] The above-mentioned silicone resin can use a vinyl silicone resin. Specifically, a silicone resin with a trade name of XJY-8206A (Xinjiayi) can be used.

[0088] (Hydrogen-containing silicone oil)

[0089] The hydrogen-containing silicone oil of the present application can be a side hydrogen or a terminal side hydrogen structure, as long as it is a silicone oil having at least one silicon hydrogen bond in one molecule.

[0090] The hydrogen-containing silicone oil can have a linear, branched, cyclic, or network structure.

[0091] The amount of the hydrogen-containing silicone oil added is such that the number of silicon hydrogen bonds / number of vinyl groups (hereinafter sometimes referred to as silicon hydrogen vinyl group ratio) = 1.2-1.5. When the silicon hydrogen vinyl group ratio is less than 1.2, the crosslinking degree is insufficient, which can result in insufficient reactivity of the vinyl group in the system, and more than 1.5, a large number of silicon hydrogen groups remain after the addition reaction, which participate in secondary reactions in the aging process. When the silicon hydrogen vinyl group ratio is within this range, excellent high-temperature durability and low compression permanent set can be achieved. The silicon hydrogen vinyl group ratio is more preferably 1.3-1.45.

[0092] The content of the hydrogen-containing silicone oil can be 0.5-3% based on 100 parts by mass of the above-mentioned base silicone oil.

[0093] As examples of the hydrogen-containing silicone oil, the following can be listed:

[0094] - terminal methyl silicon hydrogen side hydrogen siloxane.

[0095] The hydrogen-containing silicone oil can use a commercially available product known in the art or a product prepared by a method known in the art. The hydrogen-containing silicone oil can be used alone or in a mixture of two or more.

[0096] (Catalyst)

[0097] The catalyst of the present application is used for the addition reaction between the alkenyl group of the vinyl silicone oil and the silicon hydride group of the hydrogen-containing silicone oil (hydrosilylation). Any hydrosilylation catalyst commonly used in the art can be used in the present application.

[0098] The catalyst of the present application can be a noble metal catalyst, such as platinum, rhodium, palladium, ruthenium and iridium, preferably platinum, which is optionally supported on a carrier material. Among them, Karstedt's platinum catalyst is preferably used.

[0099] The amount of the catalyst of the present application depends on the desired crosslinking rate and cost factors, but can be 1 to 35 ppm, preferably 5 to 25 ppm, and more preferably 5 to 20 ppm, based on the weight of the noble metal. When the amount is less than 1 ppm, it is possible that the amount is too low to allow the reaction to proceed. When the amount is more than 35 ppm, the cost is too high, and in order to extend the operating time, a large amount of inhibitor needs to be added, which eventually results in too high volatile matter of the product, which is not environmentally friendly.

[0100] (Other ingredients)

[0101] In addition to the above-mentioned main ingredients, the silicone rubber composition of the present application can further contain other ingredients as additives, as necessary. As long as it is an additive commonly used in the art, it can be used within a range not affecting the effects of the present application. Specifically, the rubber composition of the present application can further contain an inhibitor, a stabilizer, a filler, an adhesion promoter, a metal powder, a fiber, a pigment, a dye, a plasticizer, a matting agent, a delustering agent, a heat and / or light stabilizer, an antistatic agent, a flame retardant, an antibacterial agent, an antifungal agent, a thixotropic agent, a photocuring inhibitor or retarder, and the like, which are well known as substances that can be conventionally used in silicone rubber compositions. The above-mentioned additives can be used within a range not affecting the effects of the present application.

[0102] Specifically, examples of the filler are inorganic fillers, such as white carbon (silica). When white carbon is used, it can be a fumed white carbon having a specific surface area of 200 to 400 m 2 / g, and the range of use is 0 to 50 parts by mass (with respect to 100 parts by mass of the silicone oil), which mainly functions to enhance. When white carbon is used as the filler, a hydroxy silicone oil, a silazane, and deionized water can be added together to treat the white carbon.

[0103] In addition, a non-enhancing filler, i.e., a filler having a BET specific surface area of less than 50 m 2 / g, such as quartz powder, diatomaceous earth, calcium silicate, zirconium silicate, zeolite, metal oxides such as iron oxide, zinc oxide, titanium dioxide, aluminum oxide, metal carbonates such as calcium carbonate, magnesium carbonate, zinc carbonate, metal sulfates, mica, silicone resin, clay, stone powder, graphite, and chalk, can be used. In addition, an organic filler can also be used.

[0104] As examples of the inhibitors which can be used in the present application, acetylenic alcohols such as ethynylcyclohexanol (e.g., 1-ethynyl-1-cyclohexanol, also known as ECH) and 2-methyl-3-butyn-2-ol and the like known in the art can be listed. The inhibitor is preferably selected from acetylenic alcohols, more preferably 1-ethynyl-1-cyclohexanol (ECH).

[0105] (Production method of the silicone rubber composition)

[0106] The silicone rubber composition of the present application can be produced by mixing the desired ingredients in a base after the base is produced.

[0107] Specifically, the base mixture is obtained by mixing the vinyl silicone oil I, fillers and additives as needed at a temperature of 60 to 180°C, and the base is obtained by vacuum treatment and addition of the vinyl silicone oil I diluted after the base mixture. Further, the component A is obtained by mixing the vinyl silicone oil I, the vinyl silicone oil II, the vinyl silicone oil III and the catalyst in the base, and the component B is obtained by mixing the vinyl silicone oil I, the vinyl silicone oil II, the vinyl silicone oil III and the sulfur-containing silicone-treated compound, the hydrogen-containing silicone oil and additives as needed in the base. When the silicone rubber product is produced, the component A and the component B are mixed, and the rubber product is obtained after vulcanization. The conditions for vulcanization are not particularly limited, and the vulcanization conditions generally used in the art can be used. For example, it can be 120°C x 10 min or 170°C x 10 min.

[0108] The apparatus for mixing or compounding is not particularly limited, and the apparatus for mixing or compounding generally used in the art can be used, and for example, kneaders, planetary mixers, extruders and the like can be listed.

[0109] (Rubber product)

[0110] The silicone rubber composition of the present application can be used for producing self-oil-bleeding silicone rubber. The silicone rubber according to the present application is a self-oil-bleeding addition-type liquid silicone rubber which satisfies high tear resistance, heat resistance, oil resistance, low compression set and the like, and is a special liquid silicone rubber product, and can be widely used in the fields of electric power, automobiles, medical care and the like, and specifically, can be used for cable sheaths, automobile connectors, O-rings, gaskets, medical diaphragms, brakes, various joints, sealants and gaskets and the like, and can provide strong and durable sealing.

[0111] Examples

[0112] Hereinafter, the present application will be more specifically described by examples and comparative examples. However, the present application is not limited by the examples and comparative examples described below in any way.

[0113] In the examples, the viscosity was measured using a Hacker tester (model TYP006-0572) at 25°C. Unless otherwise stated, in the examples, "%" means "weight %" and "parts" means "parts by weight".

[0114] Preparation Example 1: Preparation of bis-[3-(triethoxysilyl)propyl]-disulfide modified silica micropowder

[0115] 21.68 g of bis-[3-(triethoxysilyl)propyl]-disulfide was added to 100 g of silica powder with an average particle size of 20 μm. The mixture was stirred at 1000 rpm for 20 min until homogeneous. Then, the temperature was raised to 120 °C, the stirring speed was increased to 2000 rpm, and maintained for 30 min. Subsequently, the reaction byproducts were removed under reduced pressure to obtain a white powder, namely silica powder treated with bis-[3-(triethoxysilyl)propyl]-disulfide.

[0116] Preparation Example 2: Preparation of γ-thiocyanopropyltriethoxysilane-modified silica

[0117] Except that 21.68 g of bis-[3-(triethoxysilyl)propyl]-disulfide was replaced with 19.54 g of γ-thiocyanopropyltriethoxysilane and 100 g of silica powder was replaced with 100 g of silica, silica treated with γ-thiocyanopropyltriethoxysilane was obtained by the same method as in Preparation Example 1.

[0118] Preparation Example 3: Preparation of bis-[3-(triethoxysilyl)propyl]-disulfide modified calcium carbonate

[0119] Except that 100g of 20μm silica powder was replaced with 100g of calcium carbonate, the same method as in Preparation Example 1 was used to obtain bis-[3-(triethoxysilyl)propyl]-disulfide-treated calcium carbonate.

[0120] Example 1

[0121] 100 parts of vinyl silicone oil (viscosity 60000 mPa·s, vinyl content 0.087%) were mixed with 300 ml of... 2 50 parts of fumed silica with a specific surface area of ​​ / g, 14 parts of hexamethyldisilazane, 0.5 parts of divinyltetramethylsilazane, and 8 parts of deionized water were mixed in a kneader at 80°C under an inert atmosphere, followed by vacuum treatment at 150°C. After vacuum treatment, 20 parts of vinyl silicone oil (viscosity 60000 mPa·s, vinyl content 0.087%) were added for dilution to obtain the base rubber mixture.

[0122] To 100 parts of the above base rubber mixture, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.028 parts of platinum catalyst (platinum content 100,000 ppm), to obtain the A component liquid silicone rubber.

[0123] To 100 parts of the above base rubber mixture, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.4 parts of silicon micro powder treated with bis-[3-(triethoxysilyl)propyl]-disulfide, 1.7 parts of hydrogen- containing silicone oil with end and side structures having an H mass fraction of 0.75%, 0.18 parts of inhibitor ECH, to obtain the B component liquid silicone rubber.

[0124] Example 2

[0125] To 100 parts of the base rubber mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 19,000 mPa-s, vinyl group content 2%), 4 parts of phenyl silicone oil, 0.028 parts of platinum catalyst (platinum content 100,000 ppm), to obtain the A component liquid silicone rubber.

[0126] To 100 parts of the base rubber mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 19,000 mPa-s, vinyl group content 2%), 4 parts of phenyl silicone oil, 0.4 parts of white carbon treated with γ-thiocyano propyl triethoxysilane, 1.7 parts of hydrogen-containing silicone oil with end and side structures having an H mass fraction of 0.75%, 0.18 parts of inhibitor ECH, to obtain the B component liquid silicone rubber.

[0127] Example 3

[0128] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.028 parts of platinum catalyst (platinum content 100,000 ppm), to obtain the A component liquid silicone rubber.

[0129] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.1 parts of silicon powder treated with bis-[3-(triethoxysilyl)propyl]-disulfide, 1.7 parts of end- and side-chain hydrogen-containing silicone oil having a hydrogen content of 0.75% by mass, and 0.18 parts of inhibitor ECH, to obtain the B component liquid silicone rubber.

[0130] Example 4

[0131] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.028 parts of platinum catalyst (platinum content 100,000 ppm), to obtain the A component liquid silicone rubber.

[0132] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.1 parts of silicon powder treated with bis-[3-(triethoxysilyl)propyl]-disulfide, 1.7 parts of end- and side-chain hydrogen-containing silicone oil having a hydrogen content of 0.75% by mass, and 0.18 parts of inhibitor ECH, to obtain the B component liquid silicone rubber.

[0133] Example 5

[0134] To 100 parts of the base mixture obtained in Example 1, 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, and 0.028 parts of platinum catalyst (platinum content 100,000 ppm) were added to obtain Component A liquid silicone rubber.

[0135] To 100 parts of the base mixture obtained in Example 1, 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.77 parts of silicon micropowder treated with bis-[3-(triethoxysilyl)propyl]-disulfide, 1.7 parts of end- and side-chain hydrogen-containing silicone oil having an H mass fraction of 0.75%, and 0.18 parts of inhibitor ECH were added to obtain Component B liquid silicone rubber.

[0136] Example 6

[0137] To 100 parts of the base mixture obtained in Example 1, 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, and 0.028 parts of platinum catalyst (platinum content 100,000 ppm) were added to obtain Component A liquid silicone rubber.

[0138] To 100 parts of the base mixture obtained in Example 1, 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.77 parts of silicon micropowder treated with bis-[3-(triethoxysilyl)propyl]-disulfide, 1.7 parts of end- and side-chain hydrogen-containing silicone oil having an H mass fraction of 0.75%, and 0.18 parts of inhibitor ECH were added to obtain Component B liquid silicone rubber.

[0139] Comparative Example 1

[0140] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 4 parts of phenyl silicone oil, 0.028 parts of platinum catalyst (platinum content 100,000 ppm), to obtain the A component liquid silicone rubber.

[0141] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 4 parts of phenyl silicone oil, 0.4 parts of silicon powder treated with bis-[3-(triethoxysilyl)propyl]-disulfide, 1.1 parts of hydrogen- containing silicone oil having a terminal side structure with H mass fraction of 0.75%, and 0.18 parts of the inhibitor ECH, to obtain the B component liquid silicone rubber.

[0142] Comparative Example 2

[0143] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 0.028 parts of platinum catalyst (platinum content 100,000 ppm), to obtain the A component liquid silicone rubber.

[0144] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 1.7 parts of hydrogen-containing silicone oil having a terminal side structure with H mass fraction of 0.75%, and 0.18 parts of the inhibitor ECH, to obtain the B component liquid silicone rubber.

[0145] Comparative Example 3

[0146] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 4 parts of phenyl silicone oil, 0.028 parts of platinum catalyst (platinum content 100,000 ppm), to obtain the A component liquid silicone rubber.

[0147] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 4 parts of phenyl silicone oil, 1.1 parts of the end- and side-chain type hydrogen- containing silicone oil having an H mass fraction of 0.75%, and 0.18 g of the inhibitor ECH, to obtain a liquid silicone rubber of Component B.

[0148] Comparative Example 4

[0149] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 19,000 mPa-s, vinyl group content 2%), 4 parts of phenyl silicone oil, and 0.028 parts of the platinum catalyst (platinum content 100,000 ppm), to obtain a liquid silicone rubber of Component A.

[0150] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 19,000 mPa-s, vinyl group content 2%), 4 parts of phenyl silicone oil, and 0.028 parts of the platinum catalyst (platinum content 100,000 ppm), to obtain a liquid silicone rubber of Component A.

[0151] Comparative Example 5

[0152] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 19,000 mPa-s, vinyl group content 2%), 4 parts of phenyl silicone oil, and 0.028 parts of the platinum catalyst (platinum content 100,000 ppm), to obtain a liquid silicone rubber of Component A.

[0153] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 19,000 mPa-s, vinyl group content 2%), 4 parts of phenyl silicone oil, 0.4 part of bis-[3-(triethoxysilyl)propyl]-disulfide, 1.7 parts of the end- and side-chain type hydrogen- containing silicone oil having an H mass fraction of 0.75%, and 0.18 part of the inhibitor ECH, to obtain a liquid silicone rubber of Component B.

[0154] Comparative Example 6

[0155] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, and 0.028 part of the platinum catalyst (platinum content 100,000 ppm), to obtain a liquid silicone rubber of Component A.

[0156] To 100 parts of the base mixture obtained in Example 1, were added 3 parts of the first vinyl silicone oil (viscosity 20,000 mPa-s, vinyl group content 0.09%), 4 parts of the second vinyl silicone oil (viscosity 2,000 mPa-s, vinyl group content 0.55%), 2.5 parts of the third vinyl silicone oil (viscosity 10,000 mPa-s, vinyl group content 2.2%), 4 parts of phenyl silicone oil, 1.49 parts of the silicon micropowder treated with bis-[3-(triethoxysilyl)propyl]-disulfide, 1.7 parts of the end- and side-chain type hydrogen- containing silicone oil having an H mass fraction of 0.75%, and 0.18 part of the inhibitor ECH, to obtain a liquid silicone rubber of Component B.

[0157] Comparative Example 7

[0158] A rubber sample was prepared according to Example 7 of US5977249.

[0159] Synthesis and testing of rubber

[0160] The prepared A and B components of each of the examples and comparative examples were mixed in a weight ratio of 1 : 1, and then subjected to vulcanization testing. The molding conditions were 170°C x 10 min, and no second vulcanization was required.

[0161] Then the hardness, tensile strength / elongation at break, tear strength, resilience, compression set, scorch time T10, curing time T90, maximum torque MH of each rubber sample slice obtained are tested respectively. Among them, the hardness is measured according to ASTM D 2240. The tensile strength / elongation at break is measured according to ASTM D 412. The tear strength is measured according to ASTM D 624B. The resilience is measured according to ASTM D 1054. The compression set is measured according to ASTM D 395. The scorch time T10, curing time T90, maximum torque MH are determined according to the group standard "T / FSI 076-2022 Self-lubricating liquid silicone rubber for connectors".

[0162] As can be seen from the data in Table 1, even the comparative example with low short-term compression set does not perform well after long-term durability test. In contrast, the rubber product of the present application can achieve low compression set at high temperature durability in a synergistic manner, without affecting the mechanical properties.

Claims

1. A silicone rubber composition comprising: (A) a base silicone oil comprising: a double-tipped vinyl silicone oil (Vinyl Silicone I) having a viscosity of 10,000 to 100,000 mPa-s, a side-chain vinyl silicone oil (Vinyl Silicone II) having a viscosity of 500 to 20,000 mPa-s, and a tip-side vinyl silicone oil (Vinyl Silicone III) having a viscosity of 5,000 to 20,000 mPa-s, in an amount of 100 parts by mass; (B) a complex modified with a sulfur-containing silane compound, in an amount of 0.05 to 0.5 parts by mass; (C) a hydrogen-containing silicone oil in an amount such that the number of silicon-hydrogen bonds / number of vinyl groups in the silicone rubber composition = 1.2 to 1.5; (D) a noble metal catalyst, in an amount of 1 to 35 ppm by weight of the noble metal.

2. The silicone rubber composition according to claim 1, wherein in the above base silicone oil 100 parts by mass, Vinyl Silicone I is 60 to 98 parts; Vinyl Silicone II is 1 to 20 parts; Vinyl Silicone III is 1 to 20 parts.

3. The silicone rubber composition according to claim 1 or 2, further comprising at least one of the following: an inhibitor and a filler; Optionally, the filler is an organic filler or an inorganic filler, such as white carbon; Preferably, the inhibitor is an acetylenic alcohol-based inhibitor, more preferably, the inhibitor is 1-ethynyl-1-cyclohexanol.

4. The silicone rubber composition according to any one of claims 1 to 3, wherein the viscosity of the Vinyl Silicone I at 25°C is 20,000 to 80,000 mPa-s, preferably 20,000 to 60,000 mPa-s; and / or, the viscosity of the Vinyl Silicone II at 25°C is 1,000 to 10,000 mPa-s, preferably 2,000 to 5,000 mPa-s; and / or, the viscosity of the Vinyl Silicone III at 25°C is 10,000 to 19,000 mPa-s.

5. The silicone rubber composition according to any one of claims 1 to 4, wherein the content of the Vinyl Silicone I is 80 to 98 wt%, preferably 85 to 95 wt%, based on the weight of the base silicone oil; and / or, the content of the Vinyl Silicone II is 2 to 15 wt%, preferably 2 to 10 wt%; and / or, the content of the Vinyl Silicone III is 1 to 15 wt%, preferably 1 to 5 wt%.

6. The silicone rubber composition according to any one of claims 1 to 5, wherein the vinyl content of the above tip-side vinyl silicone oil is 1 to 20 wt%, preferably 1 to 8 wt%, further preferably 2 to 4 wt%.

7. The silicone rubber composition according to any one of claims 1 to 6, wherein the hydrogen-containing silicone oil is a silicone oil having at least one silicon-hydrogen bond in one molecule; Preferably, the hydrogen-containing silicone oil is added in an amount such that the number of silicon-hydrogen bonds / number of vinyl groups in the silicone rubber composition is 1.3 to 1.

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8. The silicone rubber composition according to any one of claims 1 to 7, wherein the above composition further comprises a phenyl silicone oil; optionally, the content of the phenyl silicone oil is 1 to 8 wt%, based on the weight of the base silicone oil.

9. The silicone rubber composition according to any one of claims 1 to 8, wherein the composite comprises at least one of a silica powder, a clay, calcium carbonate, white carbon, aluminum hydroxide, magnesium hydroxide, silicone oil, silicone resin.

10. The silicone rubber composition according to any one of claims 1 to 9, wherein the sulfur-containing silane compound-modified composite is a composite obtained by modifying a sulfur-containing silane compound to a silica powder, a clay, calcium carbonate, white carbon, aluminum hydroxide, magnesium hydroxide, silicone oil, or silicone resin; alternatively, the sulfur-containing silane compound-modified composite is obtained by uniformly mixing a sulfur-containing silane with a silica powder, a clay, calcium carbonate, white carbon, aluminum hydroxide, magnesium hydroxide, silicone oil, or silicone resin under heating and stirring, and then solidifying.

11. The silicone rubber composition according to any one of claims 1 to 10, said sulfur-containing silane having the formula X b [R 2 a Si(OR 1 ) 4-a ] c wherein, R 1 each independently is an alkyl group having a carbon number of 1 to 10, for example, a methyl group, an ethyl group, a propyl group, or a butyl group; R 2 each independently is an alkyl group having a carbon number of 1 to 10, for example, a methyl group, an ethyl group, a propyl group, or a butyl group, when R 1 or R 2 is an alkylene group when connected to the group of X; X is a sulfur-containing group, such as a mercapto group, a thiocyanato group, a sulfoxide group, a sulfone group, a thioether group, a disulfide group, or a tetrasulfide group; a is an integer of 1 to 3, b is an integer of 1 to 3, and c is an integer of 1 to 3.

12. The silicone rubber composition according to any one of claims 1-11, wherein the sulfur-containing silane is:

13. The silicone rubber composition according to any one of claims 1 to 12, wherein the sulfur-containing silane compound-modified composite is added in a proportion of 0.1 to 0.5 wt%, preferably 0.2 to 0.4 wt%, based on the base silicone oil.

14. The silicone rubber composition according to any one of claims 1 to 13, wherein the proportion contained of the sulfur-containing groups in the complex modified with the sulfur-containing silane compound is 0.2 x 10 -4 -4 x 10 -3 mol / g.

15. The silicone rubber composition according to any one of claims 1 to 14, wherein the hydrogen-containing silicone oil is added in an amount such that the number of silicon-hydrogen bonds per number of vinyl groups in the silicone rubber composition is 1.3 to 1.

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16. The silicone rubber composition according to any one of claims 1-15, wherein the noble metal catalyst is platinum, rhodium, palladium, ruthenium and iridium, preferably platinum, optionally supported on a support material; wherein, Preferably, a Karstedt platinum catalyst is used; and / or, the noble metal catalyst is used in an amount of 5 to 25 ppm, preferably 5 to 20 ppm, in terms of the weight of the noble metal.

17. The silicone rubber composition according to any one of claims 1 to 16, wherein the rubber composition further comprises at least one of a stabilizer, an adhesion promoter, a metal powder, a fiber, a pigment, a dye, a plasticizer, a matting agent, a delusterant, a heat and / or light stabilizer, an antistatic agent, a flame retardant, an antibacterial agent, an antifungal agent, a thixotropic agent, a photocuring inhibitor, and a retarder.

18. The silicone rubber composition according to any one of claims 1 to 17, wherein the vinyl group of at least one of the vinyl silicone oil I, the vinyl silicone oil II, and the vinyl silicone oil III is replaced with a group of propenyl, 3-butenyl, 5-hexenyl, 9-decenyl, 10-undecenyl, 5,9-decadienyl, or 6,11-dodecadienyl.

19. A rubber product prepared using the silicone rubber composition according to any one of claims 1 to 18; preferably, the rubber product is a cable jacket, an automotive plug-in, an O-ring, a gasket, a medical diaphragm, a brake, a joint, a sealant, or a grommet.

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