Rubber sealing material as well as preparation method and application thereof

Abstract

The invention provides a rubber sealing material as well as a preparation method and application thereof. The rubber sealing material provided by the invention is prepared from the following components in parts by weight: 100 parts of non-polar rubber and 5 to 20 parts of anti-aging agent modified liquid rubber, wherein the anti-aging agent modified liquid rubber comprises the following raw materials: liquid rubber, a second anti-aging agent and a second cross-linking agent, and the weight ratio of the liquid rubber to the second anti-aging agent to the second cross-linking agent is 100: (100-150): (0.5-5). According to the rubber sealing material provided by the invention, the non-polar rubber which is difficult to be compatible with the vegetable insulating oil is selected as a matrix according to a'similar compatibility 'principle, so that the swelling degree of the vegetable insulating oil is reduced; the anti-aging agent modified liquid rubber is selected to replace a traditional oil plasticizer, and the second anti-aging agent is anchored on the liquid rubber, so that the emigration probability of the second anti-aging agent and the plasticizer in contact with vegetable insulating oil is reduced, and the dosage of the anti-aging agent and the plasticizer is greatly reduced on the basis of not reducing the performance of the rubber sealing material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing materials, in particular to a rubber sealing material and a preparation method and application thereof. BACKGROUND

[0002] As the core equipment of the power system, the long-term stable operation of the transformer highly depends on the performance of the sealing material. The rubber sealing part plays a key role in isolating external moisture, pollutants and internal insulating medium (such as transformer oil) in the transformer, and needs to withstand multiple challenges such as temperature fluctuations, mechanical stress and chemical corrosion. The insulating oil resistance of the rubber sealing material directly affects the reliability, service life and safety of the transformer.

[0003] Although the traditional mineral insulating oil has good electrical properties, it has poor biodegradability and poses environmental risks. Although the plant insulating oil has environmental advantages as a renewable alternative, it is mainly composed of polar ester substances, which can easily swell when in contact with traditional rubber sealing rubber materials. This can cause a large amount of conventional plasticizers and anti-aging agents inside the rubber sealing material to migrate into the insulating oil, which can not only reduce the sealing capacity of the rubber, but also change the electrical properties of the plant insulating oil, leading to sealing failure or potential safety hazards of the transformer.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The main purpose of the present application is to provide a rubber sealing material and a preparation method and application thereof, so as to solve the problem that the traditional rubber sealing material can swell when in contact with the plant insulating oil, causing a large amount of conventional plasticizers and anti-aging agents inside the rubber sealing material to migrate into the insulating oil, leading to sealing failure or potential safety hazards of the transformer.

[0006] In order to achieve the above purpose, according to one aspect of the present application, a rubber sealing material is provided, which comprises, by weight fraction: non-polar rubber 100 parts, anti-aging agent modified liquid rubber 5-20 parts, nano filler 20-80 parts, first crosslinking agent 0.5-5 parts, auxiliary crosslinking agent 0-2 parts, and first anti-aging agent 0.1-2 parts; wherein the raw materials of the anti-aging agent modified liquid rubber include liquid rubber, second anti-aging agent and second crosslinking agent, and the weight ratio of the three is 100:(100-150):(0.5-5), and the second crosslinking agent is a peroxide.

[0007] Further, the liquid rubber is a liquid rubber containing carboxyl, and preferably the liquid rubber is selected from at least one of carboxyl liquid styrene-butadiene rubber, carboxyl liquid nitrile rubber and carboxyl liquid polybutadiene rubber.

[0008] Further, the second antioxidant is an antioxidant containing an amine group, preferably the antioxidant containing an amine group is selected from at least one of antioxidant ODA, antioxidant AW, antioxidant 7PPD, antioxidant DNP.

[0009] Further, the second cross-linking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane.

[0010] Further, the liquid rubber is a liquid rubber containing a carboxyl group, the second antioxidant is an antioxidant containing an amine group, and the molar ratio of the carboxyl group in the liquid rubber to the amine group in the second antioxidant is 1: (1-1.5).

[0011] Further, the non-polar rubber is selected from at least one of ethylene-propylene-diene rubber, styrene butadiene rubber, butyl rubber, cis-butadiene rubber, and natural rubber.

[0012] Further, the nano-filler is selected from at least one of carbon black, silicon dioxide, graphene oxide, clay, calcium carbonate, or clay.

[0013] Further, the first antioxidant is selected from at least one of antioxidant D, antioxidant RD, antioxidant 4010, antioxidant 4010NA, and antioxidant 4020.

[0014] Further, the cross-linking agent is selected from at least one of sulfur, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, di-tert-butylperoxyisopropylbenzene, and dicumyl peroxide.

[0015] Further, the co-cross-linking agent is selected from at least one of trimethylolpropane trimethacrylate, tetramethylthiuram disulfide, triallyl isocyanurate, N,N'-m-phenylene bismaleimide, and N-cyclohexyl-2-benzothiazole sulfenamide.

[0016] Further, the method for preparing the antioxidant-modified liquid rubber comprises: step A1, dispersing and uniformly mixing the liquid rubber and the second antioxidant in an organic solvent to perform a grafting reaction, to obtain a modified liquid rubber system; and step A2, adding the second cross-linking agent to the liquid rubber system, uniformly mixing, and removing the organic solvent, to obtain the antioxidant-modified liquid rubber.

[0017] Further, the organic solvent is selected from at least one of ethanol, toluene, xylene, tetrahydrofuran, and chlorobenzene.

[0018] To achieve the above-mentioned purpose, according to another aspect of the present application, a method for preparing the above-mentioned rubber sealing material is provided, which comprises: step S1, uniformly mixing the non-polar rubber, the nano-filler, the first antioxidant, the first cross-linking agent, and the co-cross-linking agent, to obtain a rubber compound; and step S2, uniformly mixing the rubber compound with the antioxidant-modified liquid rubber, and then performing a segmented cross-linking, to obtain the rubber sealing material.

[0019] Further, the segmented cross-linking includes: low temperature vulcanization and high temperature vulcanization, wherein the temperature of the low temperature vulcanization is 115-125℃, and the temperature of the high temperature vulcanization is 150-200℃.

[0020] According to a third aspect of the present application, the rubber sealing material provided by the first aspect or obtained by the preparation method of the second aspect is applied in the field of plant insulating oil resistance.

[0021] According to the technical solution of the present application, the rubber sealing material provided by the present application, according to the principle of "similar compatibility", selects a non-polar rubber which is difficult to be compatible with plant insulating oil as a matrix, thereby reducing the swelling degree of the plant insulating oil; selects an antioxidant modified liquid rubber to replace the traditional oil plasticizer, and anchors the second antioxidant on the liquid rubber, thereby not only reducing the migration probability of the second antioxidant and the plasticizer when they contact with the plant insulating oil, but also greatly reducing the amount of the antioxidant and the plasticizer on the basis of not reducing the performance of the rubber sealing material; selects a peroxide with a relatively low decomposition temperature as the second cross-linking agent and introduces it into the antioxidant modified liquid rubber. In the vulcanization process, the decomposition of the peroxide makes the antioxidant modified liquid rubber locally form nano clusters and a micro cross-linking network, which is more conducive to inhibiting the penetration path of the plant insulating oil; selects the nano filler, the first cross-linking agent, the co-cross-linking agent and the first antioxidant to synergize with the non-polar rubber and the antioxidant modified liquid rubber, which is more conducive to improving the stability of the cross-linking network inside the rubber sealing material, and further improving the anti-deformation ability and deformation recovery ability of the rubber sealing material. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments.

[0023] As analyzed in the background art of the present application, the conventional rubber sealing material is prone to swelling when it contacts with the plant insulating oil, which causes a large amount of conventional plasticizers and antioxidants inside the rubber sealing material to migrate into the insulating oil, which on the one hand leads to the decline of the rubber sealing ability, and on the other hand also causes the electrical performance of the plant insulating oil to change, leading to sealing failure or potential safety hazards of the transformer. In order to solve this problem, the present application provides a rubber sealing material and a preparation method and application thereof.

[0024] In the first typical embodiment of the present application, a rubber sealing material is provided, which comprises, in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 5-20 parts, nano filler 20-80 parts, crosslinking agent 0.5-5 parts, auxiliary crosslinking agent 0-2 parts, first antioxidant 0.1-2 parts; wherein the raw materials of the antioxidant modified liquid rubber comprise liquid rubber, the second crosslinking agent is peroxide, and the mass ratio of the three is 100:(100-150):(0.5-5).

[0025] It should be noted that, in the present application, the decomposition temperature of the peroxide as the second crosslinking agent is ≤ 150℃, so that the rubber sealing material provided in the present application can form a nano cluster and a micro-crosslinking network in the antioxidant modified liquid rubber during the vulcanization process.

[0026] The rubber sealing material provided in the present application selects non-polar rubber which is difficult to be compatible with vegetable insulating oil as the matrix according to the principle of "like dissolves like", which reduces the swelling degree of the vegetable insulating oil; selects antioxidant modified liquid rubber to replace the traditional oil plasticizer, and anchors the second antioxidant on the liquid rubber, which not only reduces the migration probability of the second antioxidant and the plasticizer when they contact with the vegetable insulating oil, but also greatly reduces the amount of the antioxidant and the plasticizer without reducing the performance of the rubber sealing material. The present application selects peroxide with a relatively low decomposition temperature as the second crosslinking agent and introduces it into the antioxidant modified liquid rubber, which makes the antioxidant modified liquid rubber form a nano cluster and a micro-crosslinking network during the vulcanization process of the rubber sealing material, which is more conducive to inhibiting the penetration path of the vegetable insulating oil; the nano filler, the first crosslinking agent, the auxiliary crosslinking agent and the first antioxidant are selected to be mutually synergistic with the non-polar rubber and the antioxidant modified liquid rubber, which is more conducive to improving the stability of the crosslinking network inside the rubber sealing material, and further improving the anti-deformation ability and deformation recovery ability of the rubber sealing material.

[0027] In the rubber sealing material provided in the present application, the amount of the antioxidant modified liquid rubber is 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts or a range value composed of any two numerical values, based on 100 parts by weight of the non-polar rubber; the amount of the nano filler is 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 50 parts, 60 parts, 70 parts, 80 parts or a range value composed of any two numerical values; the amount of the first crosslinking agent is 0.5 parts, 0.8 parts, 1.0 part, 1.5 parts, 2 parts, 3 parts, 4 parts, 5 parts or a range value composed of any two numerical values; the amount of the co-crosslinking agent is 0 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1.0 part, 1.2 parts, 1.5 parts, 1.8 parts, 2.0 parts or a range value composed of any two numerical values; and the amount of the first antioxidant is 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts or a range value composed of any two numerical values.

[0028] In the raw material of the antioxidant modified liquid rubber provided in the present application, the amount of the second antioxidant is 100 parts, 105 parts, 110 parts, 120 parts, 130 parts, 140 parts, 150 parts or a range value composed of any two numerical values, based on 100 parts by weight of the liquid rubber; and the amount of the second crosslinking agent is 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts, 3 parts, 4 parts, 5 parts or a range value composed of any two numerical values.

[0029] In some embodiments of the present application, the liquid rubber is a liquid rubber containing carboxyl groups, so as to facilitate grafting of the second antioxidant into the liquid rubber through the carboxyl groups. Specifically, the liquid rubber includes but is not limited to any one or more of carboxyl liquid styrene-butadiene rubber, carboxyl liquid nitrile-butadiene rubber, carboxyl liquid polybutadiene rubber.

[0030] In some embodiments of the present application, the second antioxidant is an antioxidant containing amine groups, so as to facilitate grafting of the antioxidant into the liquid rubber through the amine groups. Specifically, the second antioxidant includes but is not limited to any one or more of antioxidant ODA, antioxidant AW, antioxidant 7PPD, antioxidant DNP.

[0031] In some embodiments of the present application, the peroxide as the second crosslinking agent is a peroxide suitable for decomposition within a vulcanization temperature range, such as crosslinking agent 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane and the like.

[0032] In some embodiments of the present application, the preparation method of the antioxidant modified liquid rubber comprises: step A1, dispersing and uniformly mixing the liquid rubber and the second antioxidant in an organic solvent to perform grafting reaction, to obtain a modified liquid rubber system; and step A2, adding the second crosslinking agent into the modified liquid rubber system, uniformly mixing, and removing the organic solvent, to obtain the antioxidant modified liquid rubber.

[0033] In the preparation method of the above antioxidant modified liquid rubber, in step A1, the second antioxidant is anchored in the liquid rubber by grafting reaction to form a "chemical bond anchor point" with excellent stability, avoiding its migration from the rubber sealing material under the action of vegetable insulating oil; in step A2, a peroxide with a relatively low decomposition temperature is introduced into the modified rubber system as a second crosslinking agent. During the low-temperature vulcanization process of the rubber sealing material, the decomposition of the peroxide causes the antioxidant modified liquid rubber to form a nano-cluster and a micro-crosslinking network, which in turn helps to inhibit the penetration path of vegetable insulating oil. Subsequently, during the high-temperature vulcanization process of the rubber sealing material, the antioxidant modified liquid rubber can further crosslink with the non-polar rubber, making the crosslinking network of the rubber sealing material more perfect and stable, and improving the anti-deformation ability and deformation recovery ability of the rubber sealing material.

[0034] In some embodiments of the present application, in the above step A1, the temperature of the grafting reaction is 50-80℃, and the time of the grafting reaction is 1-4h, so as to improve the efficiency of the grafting reaction. Specifically, the temperature of the grafting reaction can be 50℃, 60℃, 70℃, 80℃, or a range value composed of any two of the above values; the time of the grafting reaction can be 1h, 2h, 3h, 4h, or a range value composed of any two of the above values.

[0035] In some embodiments of the present application, in the above step A2, the method for removing the organic solvent is heating, preferably the temperature of the heating is 50-80℃, and the time of the heating is 4-7h, such as drying at 60℃ for 6h in a drying oven. Specifically, the temperature of the heating for removing the organic solvent can be 50℃, 55℃, 60℃, 65℃, 70℃, 75℃, 80℃, or a range value composed of any two of the above values; the time of the heating can be 4h, 4.5h, 5h, 6h, 7h, or a range value composed of any two of the above values.

[0036] The specific types of the organic solvent as the dispersion liquid rubber and the second antioxidant are not limited, including but not limited to any one or more of ethanol, toluene, xylene, tetrahydrofuran, chlorobenzene.

[0037] In some embodiments of the present application, the liquid rubber is a liquid rubber containing carboxyl groups, the second antioxidant is an antioxidant containing amine groups, and the molar ratio of the carboxyl groups in the liquid rubber to the amine groups in the second antioxidant is 1:(1-1.5), so as to facilitate the grafting of the second antioxidant into the liquid rubber. Specifically, the molar ratio of the carboxyl groups in the liquid rubber to the amine groups in the second antioxidant can be 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, or a range value composed of any two of the above values.

[0038] In some embodiments of the present application, the non-polar rubber includes, but is not limited to, any one or more of ethylene propylene diene rubber, styrene butadiene rubber, butyl rubber, cis-butadiene rubber, and natural rubber.

[0039] In some embodiments of the present application, the nano-filler includes, but is not limited to, any one or more of carbon black, silicon dioxide, graphene oxide, calcium carbonate, or clay, so as to reduce the cost while improving the strength of the rubber sealing material.

[0040] In some embodiments of the present application, the first antioxidant is a commonly used antioxidant in the art, including, but not limited to, any one or more of antioxidant D (N-phenyl-2-naphthylamine), antioxidant RD (2,2,4-trimethyl-1,2-dihydroquinoline polymer), antioxidant 4010 (N-cyclohexyl-N'-phenyl-p-phenylenediamine), antioxidant 4010NA (N-isopropyl-N'-phenyl-p-phenylenediamine), and antioxidant 4020 (N-(1,3-dimethyl)butyl-N'-phenyl-p-phenylenediamine).

[0041] In some embodiments of the present application, the cross-linking agent is a commonly used cross-linking agent in the art, including, but not limited to, any one or more of sulfur, 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane.

[0042] In some embodiments of the present application, the co-cross-linking agent is a commonly used co-cross-linking agent in the art, including, but not limited to, any one or more of trimethylolpropane trimethylacrylate, tetramethylthiuram disulfide, triallyl isocyanurate, N,N'-m-phenylene bismaleimide, and N-cyclohexyl-2-benzothiazole sulfenamide.

[0043] In a second typical embodiment of the present application, a preparation method of the rubber sealing material is also provided, which includes: step S1, uniformly mixing the non-polar rubber, the nano-filler, the first antioxidant, the first cross-linking agent, and the co-cross-linking agent to obtain a rubber compound; and step S2, uniformly mixing the rubber compound with the antioxidant modified liquid rubber, and then performing segmented cross-linking to obtain the rubber sealing material.

[0044] The preparation method of the rubber sealing material provided by the present application is simple in process, easy to operate, and capable of being produced on a large scale, which is conducive to further reducing the cost.

[0045] In some embodiments of the present application, in the step S2, the segmented cross-linking includes: first low-temperature vulcanization, and then high-temperature vulcanization, wherein the temperature of the low-temperature vulcanization is 115-125℃, the time of the low-temperature vulcanization is 1.5-5min, the temperature of the high-temperature vulcanization is 150-200℃, and the time of the high-temperature vulcanization is vulcanization according to the vulcanization curve of the rubber compound. 90 ) obtained.

[0046] In the above segmented crosslinking process, a peroxide with a low decomposition temperature is introduced into the modified rubber system as a second crosslinking agent. In the low-temperature vulcanization process for preparing the rubber sealing material, the decomposition of the peroxide causes the anti-aging agent modified liquid rubber to form a nano-cluster and a micro-crosslinking network, which in turn helps to inhibit the penetration of the plant insulating oil and the swelling of the rubber sealing material. In the subsequent high-temperature vulcanization process, the anti-aging agent modified liquid rubber can further crosslink with the non-polar rubber, making the crosslinking network of the rubber sealing material more perfect and stable, which improves the anti-deformation and deformation recovery capabilities of the rubber sealing material while ensuring excellent plant insulating oil resistance.

[0047] Specifically, in the segmented crosslinking process, the temperature of the low-temperature vulcanization is 115℃, 118℃, 120℃, 122℃, 125℃, or a range value composed of any two of the above values; the time of the low-temperature vulcanization is 1.5min, 2min, 3min, 4min, 5min, or a range value composed of any two of the above values; the temperature of the high-temperature vulcanization can be 150℃, 160℃, 170℃, 180℃, 190℃, 200℃, or a range value composed of any two of the above values; the time of the high-temperature vulcanization is to obtain a vulcanization curve after each mixing rubber is vulcanized, and the vulcanization is carried out according to the positive vulcanization time (T 90 ) obtained from the vulcanization curve.

[0048] In some embodiments, after the mixing rubber and the anti-aging agent modified rubber are uniformly mixed in the open mill, the low-temperature vulcanization is carried out in the mold, and then the high-temperature vulcanization is carried out by heating to the corresponding high temperature.

[0049] In a third typical embodiment of the present application, the application of the rubber sealing material provided by the first typical embodiment or the transformer sealing material obtained by the preparation method provided by the second typical embodiment in the field of plant insulating oil resistance is also provided.

[0050] The rubber sealing material of the application selects non-polar rubber which is difficult to be compatible with vegetable insulating oil as the base body according to the principle of "similar compatibility", thereby reducing the swelling degree of the vegetable insulating oil; selects antioxidant modified liquid rubber to replace the traditional oil plasticizer, anchors the second antioxidant on the liquid rubber, thereby not only reducing the migration probability of the second antioxidant and the plasticizer when contacting with the vegetable insulating oil, but also greatly reducing the amount of the antioxidant and the plasticizer on the basis of not reducing the performance of the rubber sealing material; selects peroxide as the second crosslinking agent and introduces it into the antioxidant modified liquid rubber, in the vulcanization process, the decomposition of the peroxide makes the antioxidant modified liquid rubber locally form nano clusters and micro crosslinking network, which is more conducive to inhibiting the penetration path of the vegetable insulating oil; selects the nano filler, the first crosslinking agent, the co-crosslinking agent and the first antioxidant to synergize with the non-polar rubber and the antioxidant modified liquid rubber, which is more conducive to improving the stability of the crosslinking network inside the rubber sealing material, further improving the anti-deformation ability and the vegetable insulating oil resistance of the rubber sealing material, and further making the rubber sealing material have a wide application in the field of vegetable insulating oil resistance, especially in the transformer.

[0051] The beneficial effects of the application will be further illustrated below in combination with examples and comparative examples.

[0052] Example 1

[0053] The example provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 5 parts, nano filler 80 parts, first antioxidant 0.5 parts, first crosslinking agent 0.5 parts, and co-crosslinking agent 2 parts; wherein the raw materials of the antioxidant modified liquid rubber include liquid rubber, second antioxidant and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:120:0.5.

[0054] In the example, the liquid rubber is carboxyl styrene butadiene rubber (Shengxi Company, model LIGOSC3610), the second antioxidant is antioxidant ODA, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is butyl rubber (Yanshan Petrochemical Company, model 1751), the nano filler is nano white carbon black (silicon dioxide) with an average particle size of 50 nm, the first antioxidant is antioxidant 4010NA, the first crosslinking agent is 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, and the co-crosslinking agent is triallyl isocyanurate.

[0055] The rubber sealing material is prepared according to the following steps:

[0056] (1) Take 20 g of carboxylated styrene-butadiene rubber and 24 g of antioxidant ODA, mix and disperse them in xylene, and carry out grafting reaction at 60℃. After 2 h, the reaction is completed, and a modified liquid rubber system is obtained. Add 0.1 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane to the modified liquid rubber system and mix uniformly. Remove xylene by drying in a drying oven at 60℃ for 6 h to obtain an antioxidant-modified liquid rubber.

[0057] (2) First, mix 100 g of butyl rubber, 5 g of antioxidant-modified liquid rubber, 80 g of nano white carbon black, and 0.5 g of antioxidant 4010NA uniformly in an internal mixer. Then add 0.5 g of crosslinking agent 2,5-dimethyl-2,5-di-tert-butylperoxyhexane and 2 g of co-crosslinking agent triallyl isocyanurate to obtain a rubber compound.

[0058] (3) After mixing the rubber compound and the antioxidant-modified liquid rubber uniformly in an open mill, pre-vulcanize at 120℃ for 2 min, and then continue to heat to 150℃ for high-temperature crosslinking for 15 min to obtain a rubber sealing material.

[0059] Example 2

[0060] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant-modified liquid rubber 20 parts, nano filler 20 parts, first antioxidant 0.5 parts, first crosslinking agent 5 parts, and co-crosslinking agent 0.5 parts. The raw materials of the antioxidant-modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent. The second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:110:0.5.

[0061] In the present embodiment, the liquid rubber is carboxylated liquid nitrile rubber (Zeon Chemicals, USA, model NX775), the second antioxidant is antioxidant AW, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane. The non-polar rubber is styrene-butadiene rubber (Qilu Branch of China Petroleum Chemical Co., Ltd., China, model 1712), the nano filler is a mixture of nano graphene oxide and nano carbon black, the average particle size of the nano graphene oxide is 350 nm, and the average particle size of the nano carbon black is 25 nm. The first antioxidant is antioxidant 4010RD, the first crosslinking agent is dicumyl peroxide, and the co-crosslinking agent is triallyl isocyanurate.

[0062] The above rubber sealing material is prepared according to the following steps:

[0063] (1) Take 20 g of carboxyl liquid styrene-butadiene rubber and 22 g of antioxidant AW, stir and disperse them in toluene, and carry out grafting reaction at 80℃. The reaction is completed after 3 h. Then, 0.1 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is added to the modified liquid rubber system and mixed uniformly. The toluene is removed by drying in a drying oven at 60℃ for 6 h, and the antioxidant-modified liquid rubber is obtained.

[0064] (2) First, 100 g of styrene-butadiene rubber, 20 g of antioxidant-modified liquid rubber, 10 g of nano-oxidized graphene, 10 g of nano-carbon black, and 0.5 g of antioxidant RD are mixed uniformly in an internal mixer. Then, 5 g of crosslinking agent dicumyl peroxide and 0.5 g of auxiliary crosslinking agent triallyl isocyanurate are added, and a rubber compound is obtained.

[0065] (3) The rubber compound and the antioxidant-modified liquid rubber are mixed uniformly on an open mill, and then pre-vulcanized at 120℃ for 2 min. Then, the temperature is increased to 160℃, and high-temperature crosslinking is carried out for 10 min, and a rubber sealing material is obtained.

[0066] Example 3

[0067] The rubber sealing material is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant-modified liquid rubber 6 parts, nano-filler 60 parts, first antioxidant 0.2 parts, first crosslinking agent 2.5 parts, and auxiliary crosslinking agent 1 part. The raw materials of the antioxidant-modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent. The second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:100:1.

[0068] In this example, the liquid rubber is carboxyl liquid polybutadiene rubber (Hubei Xingdongcheng Chemical Co., Ltd., model CTPB), the second antioxidant is antioxidant 7PPD, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane. The non-polar rubber is cis-butadiene rubber (Sinopec Yanshan Petrochemical, model 9000), the nano-filler is a mixture of nano-calcium carbonate and nano-carbon black, the average particle size of the nano-calcium carbonate is 75 nm, and the average particle size of the nano-carbon black is 25 nm. The first antioxidant is antioxidant 4020, the first crosslinking agent is 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, and the auxiliary crosslinking agent is N,N'-m-phenylene bismaleimide.

[0069] The above rubber sealing material is prepared according to the following steps:

[0070] (1) 20 g of carboxyl liquid polybutadiene rubber and 20 g of antioxidant 7PPD were fully stirred and dispersed in chlorobenzene, and a grafting reaction was carried out at 50°C. After 4 h, the reaction was completed, and a modified liquid rubber system was obtained. 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane was mixed uniformly in the modified liquid rubber system, and the chlorobenzene was removed by drying in a drying oven at 60°C for 6 h, to obtain an antioxidant-modified liquid rubber.

[0071] (2) 100 g of cis-butadiene rubber, 6 g of antioxidant-modified liquid rubber, 20 g of nano calcium carbonate, 40 g of nano carbon black, and 0.2 g of antioxidant 4020 were uniformly mixed in an internal mixer, and then 2.5 g of crosslinking agent 2,5-dimethyl-2,5-di-tert-butylperoxyhexane and 1 g of auxiliary crosslinking agent N,N'-m-phenylene bismaleimide were added, to obtain a rubber mixture.

[0072] (3) After the rubber mixture and the antioxidant-modified liquid rubber were uniformly mixed in an open mill, pre-vulcanization was carried out at 120°C for 2 min, and then high-temperature crosslinking was carried out at 170°C for 8 min, to obtain a rubber sealing material.

[0073] Example 4

[0074] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant-modified liquid rubber 15 parts, nano filler 50 parts, first antioxidant 0.1 part, and first crosslinking agent 2 parts. The raw materials of the antioxidant-modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:130:2.

[0075] In the present embodiment, the liquid rubber is carboxyl liquid nitrile rubber (Zeon Chemicals, USA, model NX775), the second antioxidant is antioxidant DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is ethylene-propylene-diene rubber (ExxonMobil, model 3666), the nano filler is a mixture of nano clay and nano carbon black, the average particle size of the nano clay is 150 nm, and the average particle size of the nano carbon black is 25 nm; the first antioxidant is antioxidant D, and the first crosslinking agent is 2,5-dimethyl-2,5-di-tert-butylperoxyhexane.

[0076] The above rubber sealing material is prepared according to the following steps:

[0077] (1) Take 20 g of carboxyl liquid nitrile rubber and 26 g of antioxidant DNP, stir and disperse in toluene, and carry out grafting reaction at 80℃, and the reaction is completed after 1 h. Add 0.4 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane to the modified liquid rubber system, mix uniformly, and remove toluene in a drying oven at 60℃ for 6 h to obtain an antioxidant modified liquid rubber.

[0078] (2) First, mix 100 g of ethylene propylene diene rubber, 15 g of antioxidant modified liquid rubber, 30 g of nano carbon black, 20 g of nano clay, and 0.1 g of antioxidant D in an internal mixer to obtain a mixed rubber.

[0079] (3) After mixing the mixed rubber and the antioxidant modified liquid rubber in an open mill, pre-vulcanize at 120℃ for 2 min, and then continue to heat to 200℃ for high-temperature crosslinking for 11 min to obtain a rubber sealing material.

[0080] Example 5

[0081] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 5 parts, nano filler 60 parts, first antioxidant 0.2 parts, first crosslinking agent 2 parts, and crosslinking aid 0.5 parts; wherein the raw materials of the antioxidant modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:150:1.5.

[0082] In the present embodiment, the liquid rubber is carboxyl liquid polybutadiene rubber (Hubei Xingdongcheng Chemical Co., Ltd., model CTPB), the second antioxidant is antioxidant DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is natural rubber (Hainan Natural Rubber Industry Group Co., Ltd., model TSR9710), the nano filler is a mixture of nano carbon black and nano clay, the average particle size of the nano carbon black is 25 nm, and the average particle size of the nano clay is 250 nm; the first antioxidant is antioxidant 4010NA, the first crosslinking agent is di-tert-butyl peroxy isopropyl benzene, and the crosslinking aid is triallyl isocyanurate.

[0083] The above rubber sealing material is prepared according to the following steps:

[0084] (1) Take 20 g of carboxyl liquid polybutadiene rubber and 30 g of antioxidant DNP in chlorobenzene, stir and disperse thoroughly, and carry out grafting reaction at 75℃, and the reaction is completed after 3 h, to obtain a modified liquid rubber system; 0.3 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is mixed uniformly in the modified liquid rubber system, and dried in a drying oven at 60℃ for 6 h to remove toluene, to obtain an antioxidant modified liquid rubber.

[0085] (2) First, 100 g of natural rubber, 5 g of antioxidant modified liquid rubber, 30 g of nano carbon black, 30 g of nano clay, and 0.2 g of antioxidant 4010NA are uniformly mixed in an internal mixer, and then 2 g of crosslinking agent di-tert-butyl peroxyisopropylbenzene and 0.5 g of auxiliary crosslinking agent triallyl isocyanurate are added, to obtain a rubber compound.

[0086] (3) After the rubber compound and the antioxidant modified liquid rubber are uniformly mixed in an open mill, pre-vulcanization is carried out at 120℃ for 2 min, and then high-temperature crosslinking is carried out at 190℃ for 9 min, to obtain a rubber sealing material.

[0087] Example 6

[0088] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 7 parts, nano filler 32.5 parts, first antioxidant 0.5 parts, first crosslinking agent 2 parts, and auxiliary crosslinking agent 0.5 parts; wherein the raw materials of the antioxidant modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:140:1.

[0089] In the present embodiment, the liquid rubber is carboxyl liquid polybutadiene rubber (Zeon Chemicals, USA, model NX775), the second antioxidant is a mixture of antioxidant ODA and antioxidant AW, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is butyl rubber (Yanshan Petrochemical Company, model 1751), the nano filler is a mixture of nano carbon black and nano graphene oxide, the average particle size of the nano carbon black is 25 nm, and the average particle size of the nano graphene oxide is 350 nm; the first antioxidant is antioxidant 4010, the first crosslinking agent is di-tert-butyl peroxyisopropylbenzene, and the auxiliary crosslinking agent is triallyl isocyanurate.

[0090] The above rubber sealing material is prepared according to the following steps:

[0091] (1) Take 20 g of carboxyl liquid polybutyl nitrile rubber, 20 g of antioxidant ODA, and 8 g of antioxidant AW, and fully stir and disperse them in tetrahydrofuran, and perform a grafting reaction at 60°C. The reaction is completed after 2.5 h, and a modified liquid rubber system is obtained. 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is mixed uniformly in the modified liquid rubber system, and is dried in a drying oven at 60°C for 6 h to remove tetrahydrofuran, and an antioxidant-modified liquid rubber is obtained.

[0092] (2) First, 100 g of butyl rubber, 7 g of antioxidant-modified liquid rubber, 30 g of nano carbon black, 2.5 g of oxidized graphene, and 0.5 g of antioxidant 4010 are uniformly mixed in an internal mixer, and then 2 g of crosslinking agent di-tert-butyl peroxyisopropylbenzene and 0.5 g of auxiliary crosslinking agent triallyl isocyanurate are added, and a rubber compound is obtained.

[0093] (3) After the rubber compound and the antioxidant-modified liquid rubber are uniformly mixed in an open mill, they are pre-vulcanized at 120°C for 2 min, and then the temperature is continuously increased to 170°C for high-temperature crosslinking for 13 min, and a rubber sealing material is obtained.

[0094] Example 7

[0095] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant-modified liquid rubber 5 parts, nano filler 32.5 parts, first antioxidant 0.5 parts, first crosslinking agent 5 parts, and auxiliary crosslinking agent 0.2 parts; wherein the raw materials of the antioxidant-modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:100:1.

[0096] In the present embodiment, the liquid rubber is carboxyl liquid butadiene-styrene rubber (Suzhou Yilv Technology Co., Ltd., model LSBR-1), the second antioxidant is a mixture of antioxidant ODA and antioxidant 7PPD, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is butyl rubber (Yanshan Petrochemical Company, model 1751), the nano filler is a mixture of nano carbon black and nano oxidized graphene, the average particle size of the nano carbon black is 25 nm, and the average particle size of the nano oxidized graphene is 350 nm; the first antioxidant is antioxidant D, the first crosslinking agent is a mixture of sulfur and dicumyl peroxide, and the auxiliary crosslinking agent is triallyl isocyanurate.

[0097] The above rubber sealing material is prepared according to the following steps:

[0098] (1) Take 20 g of carboxyl liquid styrene-butadiene rubber, 5 g of antioxidant ODA, and 15 g of antioxidant 7PPD in tetrahydrofuran, stir and disperse thoroughly, and carry out grafting reaction at 60°C. The reaction is completed after 2.5 h, and a modified liquid rubber system is obtained. 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is mixed uniformly in the modified liquid rubber system, and dried in a drying oven at 60°C for 6 h to remove tetrahydrofuran, thereby obtaining an antioxidant-modified liquid rubber.

[0099] (2) First, 100 g of butyl rubber, 5 g of antioxidant-modified liquid rubber, 30 g of nano-carbon black, 2.5 g of oxidized graphene, and 0.5 g of antioxidant D are uniformly mixed in an internal mixer. Then, 3 g of crosslinking agent sulfur and 2 g of dicumyl peroxide and 0.2 g of auxiliary crosslinking agent triallyl isocyanurate are added to obtain a rubber compound.

[0100] (3) After the rubber compound and the antioxidant-modified liquid rubber are uniformly mixed in an open mill, pre-vulcanization is carried out at 120°C for 2 min, and then high-temperature crosslinking is carried out at 170°C for 7 min to obtain a rubber sealing material.

[0101] Example 8

[0102] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant-modified liquid rubber 8 parts, nano-filler 80 parts, first antioxidant 0.5 parts, first crosslinking agent 4 parts, and auxiliary crosslinking agent 0.5 parts. The raw materials of the antioxidant-modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent. The second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:150:0.5.

[0103] In the present embodiment, the liquid rubber is carboxyl liquid nitrile-butadiene rubber (Zeon Chemicals, USA, model NX775), the second antioxidant is a mixture of antioxidant AW and antioxidant DNP (mass ratio 1:2), and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is butyl rubber (Yanshan Petrochemical Company, model 1751), the nano-filler is nano-carbon black with an average particle size of 25 nm; the first antioxidant is antioxidant 4020, the first crosslinking agent is 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, and the auxiliary crosslinking agent is a mixture of tetramethylthiuram disulfide and triallyl isocyanurate.

[0104] The above rubber sealing material is prepared according to the following steps:

[0105] (1) Take 20 g of carboxyl liquid nitrile rubber, 10 g of antioxidant AW, 20 g of antioxidant DNP in ethanol, stir and disperse thoroughly, and carry out grafting reaction at 60℃. The reaction is completed after 2.5 h, and a modified liquid rubber system is obtained. 0.1 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is added to the modified liquid rubber system and mixed uniformly, and then dried in a drying oven at 60℃ for 6 h to remove ethanol, obtaining an antioxidant modified liquid rubber.

[0106] (2) First, 100 g of butyl rubber, 8 g of antioxidant modified liquid rubber, 80 g of nano carbon black, and 0.5 g of antioxidant 4020 are mixed uniformly in an internal mixer, and then 4 g of crosslinking agent 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane and 0.3 g of auxiliary crosslinking agent tetramethyl thiuram disulfide, 0.2 g of triallyl isocyanurate are added, obtaining a rubber compound.

[0107] (3) After the rubber compound and the antioxidant modified liquid rubber are mixed uniformly on an open mill, pre-vulcanization is carried out at 120℃ for 2 min, and then high-temperature crosslinking is carried out at 180℃ for 6 min, obtaining a rubber sealing material.

[0108] Example 9

[0109] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 6 parts, nano filler 50 parts, first antioxidant 2.0 parts, first crosslinking agent 3 parts, and auxiliary crosslinking agent 0.5 parts; wherein the raw materials of the antioxidant modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:120:1.

[0110] In the present embodiment, the liquid rubber is carboxyl liquid polybutadiene rubber (Hubei Xingdongcheng Chemical Co., Ltd., model CTPB), the second antioxidant is a mixture of antioxidant AW and antioxidant DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is butadiene-styrene rubber (Qilu Branch of China Petroleum Chemical Co., Ltd., model 1712), the nano filler is nano white carbon black (nano silicon dioxide) with an average particle size of 50 nm; the first antioxidant is antioxidant RD, the first crosslinking agent is sulfur, and the auxiliary crosslinking agent is triallyl isocyanurate. The above rubber sealing material is prepared according to the following steps:

[0111] (1) Take 20 g of carboxyl liquid butadiene rubber, 12 g of antioxidant AW, 12 g of antioxidant DNP in ethanol, stir and disperse thoroughly, and carry out grafting reaction at 60℃. The reaction is completed after 2.5 h. A modified liquid rubber system is obtained. 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is mixed uniformly in the modified liquid rubber system, and dried in a drying oven at 60℃ for 6 h to remove ethanol, to obtain an antioxidant modified liquid rubber.

[0112] (2) First, 100 g of styrene-butadiene rubber, 6 g of antioxidant modified liquid rubber, 50 g of nano white carbon black, and 2 g of antioxidant RD are uniformly mixed in an internal mixer. Then, 3 g of crosslinking agent sulfur and 0.5 g of auxiliary crosslinking agent triallyl isocyanurate are added to obtain a rubber compound.

[0113] (3) After the rubber compound and the antioxidant modified liquid rubber are uniformly mixed in an open mill, pre-vulcanization is carried out at 120℃ for 2 min, and then high-temperature crosslinking is carried out at 170℃ for 17 min to obtain a rubber sealing material.

[0114] Example 10

[0115] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 16 parts, nano filler 30 parts, first antioxidant 2.0 parts, first crosslinking agent 2.5 parts, and auxiliary crosslinking agent 0.5 parts; wherein the raw materials of the antioxidant modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:130:1.

[0116] In the present embodiment, the liquid rubber is a mixture of carboxyl liquid butyronitrile rubber (Zeon Chemicals, USA, model NX775) and carboxyl liquid styrene-butadiene rubber (Shengxiuo Company, model LIGOSC3610), the second antioxidant is antioxidant DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is cis-butadiene rubber (Sinopec Yanshan Petrochemical, model 9000), the nano filler is a mixture of nano white carbon black (nano silicon dioxide) and nano carbon black, the average particle size of the nano white carbon black is 50 nm, and the average particle size of the nano carbon black is 25 nm; the first antioxidant is antioxidant 4010NA, the first crosslinking agent is di-tert-butyl peroxyisopropylbenzene, and the auxiliary crosslinking agent is triallyl isocyanurate.

[0117] The above rubber sealing material is prepared according to the following steps:

[0118] (1) Take 10 g of carboxyl liquid nitrile rubber, 10 g of carboxyl liquid styrene-butadiene rubber, 26 g of antioxidant DNP in a mixed solvent of toluene and xylene (volume ratio of the two is 1:1) and stir and disperse thoroughly, carry out grafting reaction at 60℃, the reaction is completed after 2.5 h, obtain the modified liquid rubber system; add 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane to the modified liquid rubber system and mix uniformly, dry in a drying oven at 60℃ for 6 h to remove toluene and xylene, and obtain the antioxidant modified liquid rubber.

[0119] (2) First, mix 100 g of cis-butadiene rubber, 16 g of antioxidant modified liquid rubber, 20 g of nano white carbon black (nano silicon dioxide), 10 parts of nano carbon black, and 2 g of antioxidant 4010NA uniformly in an internal mixer, then add 2.5 g of crosslinking agent di-tert-butyl peroxyisopropylbenzene and 0.5 g of co-crosslinking agent triallyl isocyanurate to obtain a rubber compound.

[0120] (3) After mixing the rubber compound and the antioxidant modified liquid rubber uniformly on an open mill, pre-vulcanize at 120℃ for 2 min, then continue to heat to 160℃ for high-temperature crosslinking for 14 min to obtain a rubber sealing material.

[0121] Example 11

[0122] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 20 parts, nano filler 20 parts, first antioxidant 1.0 part, first crosslinking agent 1.0 part, and co-crosslinking agent 1.3 parts; wherein the raw materials of the antioxidant modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:110:1.

[0123] In the present embodiment, the liquid rubber is a mixture of carboxyl liquid nitrile rubber (Zeon Chemicals, USA, model NX775) and carboxyl liquid butadiene rubber (Hubei Xingdongcheng Chemical Co., Ltd., model CTPB), the second antioxidant is antioxidant DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is natural rubber (Hainan Natural Rubber Industry Group Co., Ltd., model TSR9710), the nano filler is nano carbon black with an average particle size of 25 nm; the first antioxidant is antioxidant 4020, the first crosslinking agent is sulfur, and the co-crosslinking agent is tetramethylthiuram disulfide.

[0124] The above rubber sealing material is prepared according to the following steps:

[0125] (1) Take 10 g of carboxyl liquid butyl nitrile rubber, 10 g of carboxyl liquid butadiene rubber, and 22 g of antioxidant DNP in a mixed solvent of toluene and xylene (volume ratio of 1:1) and stir and disperse thoroughly, and carry out grafting reaction at 60°C, and after 2.5 h, the reaction is completed, to obtain a modified liquid rubber system; 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is mixed uniformly in the modified liquid rubber system, and dried in a drying oven at 60°C for 6 h to remove toluene and chlorobenzene, to obtain antioxidant modified liquid rubber.

[0126] (2) First, 100 g of natural rubber, 20 g of antioxidant modified liquid rubber, 20 g of nano carbon black, and 1 g of antioxidant 4020 are mixed uniformly in an internal mixer, and then 1.0 g of crosslinking agent sulfur, 0.3 g of auxiliary crosslinking agent tetramethylthiuram disulfide, and 1.0 g of auxiliary crosslinking agent N-cyclohexyl-2-benzothiazole sulfenamide are added, to obtain a mixed rubber.

[0127] (3) After the mixed rubber and the antioxidant modified liquid rubber are mixed uniformly on an open mill, pre-vulcanization is carried out at 120°C for 2 min, and then high-temperature crosslinking is carried out at 150°C for 20 min, to obtain a rubber sealing material.

[0128] Example 12

[0129] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 18 parts, nano filler 20 parts, first antioxidant 2.0 parts, first crosslinking agent 1.0 part, and auxiliary crosslinking agent 0.3 part; wherein the raw materials of the antioxidant modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:100:1.

[0130] In the present embodiment, the liquid rubber is a mixture of carboxyl liquid butadiene rubber (Hubei Xingdongcheng Chemical Co., Ltd., type CTPB) and carboxyl liquid butadiene rubber (Ligose Co., Ltd., type LIGOSC3610), the second antioxidant is antioxidant 7PPD, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is natural rubber (Hainan Natural Rubber Industry Group Co., Ltd., type TSR9710), the nano filler is nano carbon black with an average particle size of 25 nm; the first antioxidant is a mixture of antioxidant 4010 and antioxidant 4020, the first crosslinking agent is sulfur, and the auxiliary crosslinking agent is a mixture of N,N'-m-phenylene bismaleimide and N-cyclohexyl-2-benzothiazole sulfenamide.

[0131] The above rubber sealing material is prepared according to the following steps:

[0132] (1) Take 10 g of carboxyl liquid styrene-butadiene rubber, 10 g of carboxyl liquid butadiene rubber, and 20 g of antioxidant 7PPD in tetrahydrofuran, stir and disperse thoroughly, and carry out grafting reaction at 60°C. The reaction is completed after 2.5 h, and a modified liquid rubber system is obtained. 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is added to the modified liquid rubber system and mixed uniformly, and the tetrahydrofuran is removed by drying in a drying oven at 60°C for 6 h, to obtain an antioxidant-modified liquid rubber.

[0133] (2) First, 100 g of styrene-butadiene rubber, 18 g of antioxidant-modified liquid rubber, 20 g of nano-carbon black, 1 g of antioxidant 4010, and 1 g of antioxidant 4020 are mixed uniformly in an internal mixer, and then 1.0 g of crosslinking agent sulfur and 0.2 g of auxiliary crosslinking agent N,N'-m-phenylene bismaleimide and 0.1 g of N-cyclohexyl-2-benzothiazole sulfenamide are added to obtain a rubber mixture.

[0134] (3) After the rubber mixture and the antioxidant-modified liquid rubber are mixed uniformly on an open mill, pre-vulcanization is carried out at 120°C for 2 min, and then high-temperature crosslinking is carried out at 180°C for 18 min to obtain a rubber sealing material.

[0135] Example 13

[0136] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant-modified liquid rubber 12 parts, nano-filler 60 parts, first antioxidant 1.0 part, first crosslinking agent 3.5 parts, and auxiliary crosslinking agent 0.5 part; wherein the raw materials of the antioxidant-modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:140:1.

[0137] In the present embodiment, the liquid rubber is a mixture of carboxyl liquid nitrile rubber (Zeon Chemicals, USA, model NX775), carboxyl liquid styrene-butadiene rubber (Shengxi Ao Company, model LIGOSC3610) and carboxyl liquid butadiene (Evonik Industries, model ST-E 60), the second antioxidant is antioxidant ODA, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is a mixture of butyl rubber (Yanshan Petrochemical Company, model 1751) and natural rubber (Hainan Natural Rubber Industry Group Co., Ltd., model TSR9710), the nano filler is a mixture of nano carbon black and nano calcium carbonate, the average particle size of the nano carbon black is 25 nm, and the average particle size of the nano calcium carbonate is 75 nm; the first antioxidant is a mixture of antioxidant 4010 and antioxidant 4010NA, and the first crosslinking agent is di-tert-butyl peroxyisopropylbenzene, and the co-crosslinking agent is triallyl isocyanurate.

[0138] The above rubber sealing material is prepared according to the following steps:

[0139] (1) 10 g of carboxyl liquid nitrile rubber, 5 g of carboxyl liquid styrene-butadiene rubber, 5 g of carboxyl liquid butadiene rubber, 28 g of antioxidant ODA were fully stirred and dispersed in toluene, and a grafting reaction was carried out at 60°C. After 2.5 h, the reaction was completed, and a modified liquid rubber system was obtained. 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane was added to the modified liquid rubber system and mixed uniformly, and the toluene was removed by drying in a drying oven at 60°C for 6 h, to obtain an antioxidant-modified liquid rubber.

[0140] (2) First, 100 g of a mixture of butyl rubber and natural rubber (the mass ratio of butyl rubber to natural rubber is 1:1), 12 g of antioxidant-modified liquid rubber, 40 g of nano carbon black, 20 g of nano calcium carbonate, 0.5 g of antioxidant 4010, and 0.5 g of antioxidant 4010NA were mixed uniformly in an internal mixer, and then 3.5 g of crosslinking agent di-tert-butyl peroxyisopropylbenzene and 0.5 g of co-crosslinking agent triallyl isocyanurate were added, to obtain a rubber compound.

[0141] (3) After the rubber compound and the antioxidant-modified liquid rubber were mixed uniformly on an open mill, pre-vulcanization was carried out at 120°C for 2 min, and then high-temperature crosslinking was carried out at 170°C for 11 min, to obtain a rubber sealing material.

[0142] Example 14

[0143] The embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, anti-aging agent modified liquid rubber 15 parts, nano filler 32.5 parts, first anti-aging agent 2.0 parts, first crosslinking agent 2.5 parts, and crosslinking aid 0.3 parts; wherein the raw materials of the anti-aging agent modified liquid rubber include liquid rubber, second anti-aging agent and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:140:1.

[0144] In the embodiment, the liquid rubber is a mixture of carboxyl liquid styrene-butadiene rubber (LIGOSC3610 of Shengxi Ao Company) and carboxyl liquid nitrile rubber (NX775 of Zeon Chemicals Company, USA), the second anti-aging agent is anti-aging agent AW, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is styrene-butadiene rubber (1712 of Qilu Branch of China Petroleum Chemical Corporation), the nano filler is a mixture of nano carbon black and nano graphene oxide, the average particle size of the nano carbon black is 25 nm, the average particle size of the nano graphene oxide is 350 nm; the first anti-aging agent is anti-aging agent 4020, the first crosslinking agent is di-tert-butyl peroxide isopropyl benzene, and the crosslinking aid is trimethylolpropane N,N'-m-phenylene bismaleimide.

[0145] The rubber sealing material is prepared according to the following steps:

[0146] (1) 10 g of carboxyl liquid styrene-butadiene rubber, 10 g of carboxyl liquid nitrile rubber and 28 g of anti-aging agent AW are fully stirred and dispersed in chlorobenzene, and a grafting reaction is carried out at 60 DEG C. The reaction is completed after 2.5 h, and a modified liquid rubber system is obtained. 0.2 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is uniformly mixed in the modified liquid rubber system, and the chlorobenzene is removed by drying in a drying oven at 60 DEG C for 6 h, to obtain anti-aging agent modified liquid rubber.

[0147] (2) 100 g of styrene-butadiene rubber, 15 g of anti-aging agent modified liquid rubber, 30 g of nano carbon black, 2.5 g of graphene oxide, 2.0 g of anti-aging agent 4020 are uniformly mixed in a banbury mixer, and then 2.5 g of crosslinking agent di-tert-butyl peroxide isopropyl benzene and 0.3 g of crosslinking aid trimethylolpropane N,N'-m-phenylene bismaleimide are added, to obtain a mixed rubber.

[0148] (3) After the mixed rubber and the anti-aging agent modified liquid rubber are uniformly mixed in an open mill, pre-vulcanization is carried out at 120 DEG C for 2 min, and then high-temperature crosslinking is carried out at 190 DEG C for 9 min, to obtain the rubber sealing material.

[0149] Example 15

[0150] The present embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, antioxidant modified liquid rubber 10 parts, nano filler 70 parts, first antioxidant 0.3 parts, first crosslinking agent 1.0 parts, and crosslinking aid 0.3 parts; wherein the raw materials of the antioxidant modified liquid rubber include liquid rubber, second antioxidant, and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:150:2.

[0151] In the present embodiment, the liquid rubber is a mixture of carboxyl liquid nitrile rubber (Zeon Chemicals, USA, model NX775) and carboxyl liquid styrene-butadiene rubber (Shengxiuo Company, model LIGOSC3610), the second antioxidant is antioxidant DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is butyl rubber (Yanshan Petrochemical Company, model 1751), the nano filler is a mixture of nano white carbon black and nano clay, the average particle size of the nano carbon black is 25 nm, and the average particle size of the nano clay is 150 nm; the first antioxidant is antioxidant RD, the first crosslinking agent is di-tert-butyl peroxide isopropyl benzene, and the crosslinking aid is N-cyclohexyl-2-benzothiazole sulfenamide.

[0152] The above rubber sealing material is prepared by the following steps:

[0153] (1) 15 g of carboxyl liquid nitrile rubber, 5 g of carboxyl liquid styrene-butadiene rubber, and 30 g of antioxidant DNP are fully stirred and dispersed in tetrahydrofuran, and a grafting reaction is carried out at 60°C. The reaction is completed after 2.5 h, and a modified liquid rubber system is obtained. 0.4 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is added to the modified liquid rubber system and mixed uniformly, and the tetrahydrofuran is removed by drying in a drying oven at 60°C for 6 h, to obtain an antioxidant modified liquid rubber.

[0154] (2) First, 100 g of butyl rubber, 10 g of antioxidant modified liquid rubber, 60 g of nano white carbon black (silicon dioxide), 10 g of nano clay, and 0.3 g of antioxidant RD are uniformly mixed in an internal mixer, and then 1.0 g of crosslinking agent di-tert-butyl peroxide isopropyl benzene and 0.3 g of crosslinking aid N-cyclohexyl-2-benzothiazole sulfenamide are added, to obtain a rubber compound.

[0155] (3) After the rubber compound and the antioxidant modified liquid rubber are uniformly mixed in an open mill, pre-vulcanization is carried out at 120°C for 2 min, and then high-temperature crosslinking is carried out at 160°C for 23 min, to obtain a rubber sealing material.

[0156] Example 16

[0157] The embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, anti-aging agent modified liquid rubber 6 parts, nano filler 40 parts, first anti-aging agent 1.5 parts, first crosslinking agent 1.5 parts, and crosslinking aid 0.5 part; wherein the raw materials of the anti-aging agent modified liquid rubber include liquid rubber, second anti-aging agent and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:120:3.

[0158] In the embodiment, the liquid rubber is carboxyl liquid styrene-butadiene rubber (LIGOSC3610 of LIGOS Company), the second anti-aging agent is anti-aging agent DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is ethylene-propylene-diene rubber (3666 of ExxonMobil Company), the nano filler is nano clay, the average particle size of the nano clay is 150 nm; the first anti-aging agent is anti-aging agent 4020, the first crosslinking agent is di-tert-butyl peroxide isopropylbenzene, and the crosslinking aid is trimethylolpropane trimethyl acrylate.

[0159] The rubber sealing material is prepared according to the following steps:

[0160] (1) 20 g of carboxyl liquid styrene-butadiene rubber and 24 g of anti-aging agent DNP are fully stirred and dispersed in xylene, and a grafting reaction is carried out at 60 DEG C. After 2.5 h, the reaction is completed, and a modified liquid rubber system is obtained. 0.6 g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is added to the modified liquid rubber system and mixed uniformly, and the xylene is removed by drying in a drying oven at 60 DEG C for 6 h, to obtain anti-aging agent modified liquid rubber.

[0161] (2) 100 g of ethylene-propylene-diene rubber, 6 g of anti-aging agent modified liquid rubber, 40 g of nano clay, 1.5 g of anti-aging agent 4020 are mixed uniformly in a banbury mixer, and then 1.5 g of crosslinking agent 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane and 0.3 g of crosslinking aid trimethylolpropane trimethyl acrylate are added, to obtain a mixed rubber.

[0162] (3) After the mixed rubber and the anti-aging agent modified liquid rubber are uniformly mixed in an open mill, pre-vulcanization is carried out at 120 DEG C for 2 min, and then high-temperature crosslinking is carried out at 150 DEG C for 25 min, to obtain the rubber sealing material.

[0163] Embodiment 17

[0164] The embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, anti-aging agent modified liquid rubber 6 parts, nano filler 80 parts, first anti-aging agent 0.5 part, first crosslinking agent 1.5 parts, and crosslinking aid 0.3 part; wherein the raw materials of the anti-aging agent modified liquid rubber include liquid rubber, second anti-aging agent and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:140:3.

[0165] In the embodiment, the liquid rubber is carboxyl liquid butadiene rubber (Evonik Industries, model ST-E 60), the second anti-aging agent is anti-aging agent DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is cis-butadiene rubber (SINOPEC Yanshan Petrochemical, model 9000), the nano filler is nano white carbon black, the average particle size of the nano white carbon black is 50 nm; the first anti-aging agent is anti-aging agent D, the first crosslinking agent is 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, and the crosslinking aid is N,N'-m-phenylene bismaleimide.

[0166] The rubber sealing material is prepared according to the following steps:

[0167] (1) 20g of carboxyl liquid butadiene rubber and 28g of anti-aging agent DNP are fully stirred and dispersed in xylene, and a grafting reaction is carried out at 60 DEG C. After 2.5h, the reaction is completed, and a modified liquid rubber system is obtained. 0.6g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is uniformly mixed in the modified liquid rubber system, and the xylene is removed by drying in a drying oven at 60 DEG C for 6h, to obtain anti-aging agent modified liquid rubber.

[0168] (2) 100g of cis-butadiene rubber, 6g of anti-aging agent modified liquid rubber, 80g of nano white carbon black and 0.5g of anti-aging agent D are uniformly mixed in a banbury mixer, and then 1.5g of crosslinking agent 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane and 0.3g of crosslinking aid N,N'-m-phenylene bismaleimide are added, to obtain a mixed rubber.

[0169] (3) After the mixed rubber and the anti-aging agent modified liquid rubber are uniformly mixed in an open mill, pre-vulcanization is carried out at 120 DEG C for 2min, and then high-temperature crosslinking is carried out at 180 DEG C for 19min, to obtain the rubber sealing material.

[0170] Embodiment 18

[0171] The embodiment provides a rubber sealing material, which is prepared from the following raw materials in parts by weight: non-polar rubber 100 parts, anti-aging agent modified liquid rubber 5 parts, nano filler 55 parts, first anti-aging agent 1.5 parts, first crosslinking agent 3 parts, and crosslinking aid 0.4 parts; wherein the raw materials of the anti-aging agent modified liquid rubber include liquid rubber, second anti-aging agent and second crosslinking agent, the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the mass ratio of the three is 100:100:1.

[0172] In the embodiment, the liquid rubber is carboxyl liquid butadiene rubber (Evonik Industries Company, model ST-E 60), the second anti-aging agent is a mixture of anti-aging agent 7PPD and anti-aging agent DNP, and the second crosslinking agent is 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane; the non-polar rubber is butyl rubber (Yanshan Petrochemical Company, model 1751), the nano filler is a mixture of nano carbon black and nano clay, the average particle size of the nano carbon black is 25 nm, and the average particle size of the nano clay is 250 nm; the first anti-aging agent is anti-aging agent 4010NA, the first crosslinking agent is sulfur, and the crosslinking aid is triallyl isocyanurate.

[0173] The rubber sealing material is prepared according to the following steps:

[0174] (1) 20g of carboxyl liquid butadiene rubber and 15g of a mixture of anti-aging agent 7PPD and 5g of anti-aging agent DNP are fully stirred and dispersed in xylene, a grafting reaction is carried out at 60 DEG C, the reaction is completed after 2.5h, a modified liquid rubber system is obtained, 0.2g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is added to the modified liquid rubber system and uniformly mixed, and the xylene is removed by drying in a drying oven at 60 DEG C for 6h to obtain anti-aging agent modified liquid rubber.

[0175] (2) 100g of butyl rubber, 5g of anti-aging agent modified liquid rubber, 35g of nano carbon black, 20g of nano clay, 1.5g of anti-aging agent 4010NA are uniformly mixed in a banbury mixer, and then 3.0g of crosslinking agent sulfur and 0.4g of crosslinking aid triallyl isocyanurate are added to obtain a mixed rubber.

[0176] (3) After the mixed rubber and the anti-aging agent modified liquid rubber are uniformly mixed in an open mill, pre-vulcanization is carried out at 120 DEG C for 2min, then the temperature is continuously increased to 160 DEG C for high-temperature crosslinking for 16min to obtain the rubber sealing material.

[0177] Comparative Example 1

[0178] The comparative example 1 provides a rubber sealing material, which is composed of the following raw materials in parts by weight: 100 parts of ethylene-propylene-diene rubber (Exxon Mobil Corporation, type 3666), 30 parts of nano-carbon black (average particle size of 25 nm), 30 parts of nano-white carbon black (average particle size of 50 nm), 2 parts of antioxidant 4010NA, 5 parts of plasticizer naphthenic oil, 2 parts of crosslinking agent dicumyl peroxide and 1 part of co-crosslinking agent triallyl isocyanurate.

[0179] It is prepared by the following steps:

[0180] (1) 100 g of ethylene-propylene-diene rubber, 30 g of nano-carbon black, 30 g of nano-white carbon black, 2 g of antioxidant 4010NA and 5 g of plasticizer naphthenic oil are uniformly mixed in an internal mixer, and further 2 g of crosslinking agent dicumyl peroxide and 1 g of co-crosslinking agent triallyl isocyanurate are added to obtain a rubber compound.

[0181] (2) The rubber compound is high-temperature vulcanized at 160°C for 13 min to obtain the ethylene-propylene-diene rubber sealing material.

[0182] Comparative example 2

[0183] The comparative example 1 provides a rubber sealing material, which is composed of the following raw materials in parts by weight: 100 parts of ethylene-propylene-diene rubber (Exxon Mobil Corporation, type 3666), 30 parts of nano-carbon black (average particle size of 25 nm), 30 parts of nano-white carbon black (average particle size of 50 nm), 2 parts of antioxidant 4010NA, 5 parts of plasticizer naphthenic oil, 2 parts of crosslinking agent dicumyl peroxide and 1 part of co-crosslinking agent triallyl isocyanurate.

[0184] It is prepared by the following steps:

[0185] (1) 100 g of ethylene-propylene-diene rubber, 30 g of nano-carbon black, 30 g of nano-white carbon black, 2 g of antioxidant 4010NA and 5 g of plasticizer naphthenic oil are uniformly mixed in an internal mixer, and further 2 g of crosslinking agent dicumyl peroxide and 1 g of co-crosslinking agent triallyl isocyanurate are added to obtain a rubber compound.

[0186] (2) The mixed rubber and the carboxyl liquid butyl rubber are mixed evenly on an open mill, pre-vulcanized at 120℃ for 2 minutes, and then heated to 180℃ for high-temperature crosslinking for 6 minutes to obtain the ternary ethylene-propylene rubber sealing material.

[0187] Comparative Example 3

[0188] The difference between this comparative example and Example 8 is that the raw material of the antioxidant modified liquid rubber does not contain 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the rest of the raw materials and the preparation method are the same as those of Example 8, which will not be repeated here.

[0189] Comparative Example 4

[0190] The difference between this comparative example and Example 8 is that the raw material of the antioxidant modified liquid rubber does not contain 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, but the raw material of the sealing rubber material contains 0.5g of 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane. And the 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane is added to the mixing mill in step (2).

[0191] Comparative Example 5

[0192] The difference between this comparative example and Example 8 is that in the raw material of the antioxidant modified liquid rubber, the weight ratio of the liquid rubber, the second antioxidant and the second crosslinking agent is 100:100:0.2.

[0193] Comparative Example 6

[0194] The difference between this comparative example and Example 8 is that in the raw material of the antioxidant modified liquid rubber, the weight ratio of the liquid rubber, the second antioxidant and the second crosslinking agent is 100:200:0.5.

[0195] Test Example

[0196] The rubber sealing materials provided by the above examples and comparative examples are respectively tested for volume change rate and compression permanent deformation, and the results are shown in Table 1 below.

[0197] Among them, (1) the test method of volume change rate (soybean oil, 70℃×168h) is to test the volume change rate of the prepared rubber sealing material according to GB / T 1690-2010 standard;

[0198] (2) The test method of compression permanent deformation (soybean oil, 70℃×168h) is to test the compression permanent deformation of the prepared rubber sealing material according to GB / T 7759.1-2015 standard.

[0199] Table 1

[0200]

[0201] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: The rubber sealing material provided by the present application selects non-polar rubber which is difficult to be compatible with vegetable insulating oil as the base body according to the principle of "similar compatibility", thereby reducing the swelling degree of the vegetable insulating oil; the traditional oil plasticizer is replaced by the antioxidant modified liquid rubber, and the second antioxidant is anchored on the liquid rubber, which not only reduces the migration probability of the second antioxidant and the plasticizer when they contact with the vegetable insulating oil, but also greatly reduces the amount of the antioxidant and the plasticizer without reducing the performance of the rubber sealing material; the peroxide with a relatively low decomposition temperature is selected as the second crosslinking agent and is introduced into the antioxidant modified liquid rubber. In the vulcanization process, the decomposition of the peroxide makes the antioxidant modified liquid rubber locally form nano clusters and a micro-crosslinking network, which is more conducive to inhibiting the penetration path of the vegetable insulating oil; the nano filler, the first crosslinking agent, the co-crosslinking agent and the first antioxidant are selected to be mutually synergistic with the non-polar rubber and the antioxidant modified liquid rubber, which is more conducive to improving the stability of the crosslinking network inside the rubber sealing material, and further improving the anti-deformation ability and deformation recovery ability of the rubber sealing material.

[0202] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rubber sealing material, characterized in that, The rubber sealing material comprises, by weight, 100 parts of non-polar rubber, 5-20 parts of antioxidant-modified liquid rubber, 20-80 parts of nanofiller, 0.5-5 parts of first crosslinking agent, 0-2 parts of co-crosslinking agent, and 0.1-2 parts of first antioxidant; wherein the raw material of the antioxidant-modified liquid rubber includes liquid rubber, second antioxidant, and second crosslinking agent, with a weight ratio of 100:(100-150):(0.5-5), and the second crosslinking agent is a peroxide.

2. The rubber sealing material according to claim 1, characterized in that, The liquid rubber is a liquid rubber containing carboxyl groups, and preferably the liquid rubber is selected from at least one of carboxyl liquid styrene-butadiene rubber, carboxyl liquid nitrile rubber, and carboxyl liquid polybutadiene rubber; And / or, the second antioxidant is an antioxidant containing an amino group, preferably the antioxidant containing an amino group is selected from at least one of antioxidants ODA, antioxidant AW, antioxidant 7PPD, and antioxidant DNP; And / or, the second crosslinking agent is 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane.

3. The rubber sealing material according to claim 1, characterized in that, The liquid rubber is a liquid rubber containing carboxyl groups, the second antioxidant is an antioxidant containing amine groups, and the molar ratio of the carboxyl groups in the liquid rubber to the amine groups in the second antioxidant is 1:(1~1.5).

4. The rubber sealing material according to claim 1, characterized in that, The non-polar rubber is selected from at least one of EPDM rubber, styrene-butadiene rubber, butyl rubber, cis-butadiene rubber, and natural rubber. And / or, the nanofiller is selected from at least one of carbon black, silicon dioxide, graphene oxide, kaolin, calcium carbonate or clay; And / or, the first antioxidant is selected from at least one of antioxidant D, antioxidant RD, antioxidant 4010, antioxidant 4010NA, and antioxidant 4020.

5. The rubber sealing material according to claim 1, characterized in that, The first crosslinking agent is selected from at least one of sulfur, 2,5-dimethyl-2,5-di-tert-butylperoxide, di-tert-butylperoxide, and diisopropylbenzene peroxide; And / or, the co-crosslinking agent is selected from at least one of trimethylolpropane trimethacrylate, tetramethylthiuram disulfide, triallyl isocyanurate, N,N'-m-phenylenebismaleimide, and N-cyclohexyl-2-benzothiazole sulfenamide.

6. The rubber sealing material according to any one of claims 1 to 5, characterized in that, The preparation method of the antioxidant-modified liquid rubber includes: Step A1: Disperse the liquid rubber and the second antioxidant in an organic solvent, mix them evenly, and carry out a grafting reaction to obtain a modified liquid rubber system; Step A2: Add the second crosslinking agent to the modified liquid rubber system and mix evenly to remove the organic solvent, thereby obtaining the antioxidant-modified liquid rubber.

7. The rubber sealing material according to claim 6, characterized in that, The organic solvent is selected from at least one of ethanol, toluene, xylene, tetrahydrofuran, and chlorobenzene.

8. A method for preparing a rubber sealing material according to any one of claims 1 to 7, characterized in that, The preparation method includes: Step S1: Mix the non-polar rubber, the nanofiller, the first antioxidant, the first crosslinking agent, and the co-crosslinking agent evenly to obtain a compound; Step S2: Mix the compound rubber and the antioxidant-modified liquid rubber evenly, and then perform segmented crosslinking to obtain the rubber sealing material.

9. The preparation method according to claim 8, characterized in that, The segmented crosslinking includes: first low-temperature vulcanization, then high-temperature vulcanization, wherein the low-temperature vulcanization temperature is 115~125℃, and the high-temperature vulcanization temperature is 150~200℃.

10. The application of a rubber sealing material according to any one of claims 1 to 7, or a rubber sealing material obtained according to the preparation method of claim 8 or 9, in the field of vegetable insulating oil resistant materials.

Images