Hydrogenated nitrile rubber composition, vulcanized rubber, preparation method of vulcanized rubber and application of vulcanized rubber in automobile synchronous belt

Abstract

The invention relates to the field of rubber, and discloses a hydrogenated butadiene-acrylonitrile rubber composition, vulcanized rubber, a preparation method of the hydrogenated butadiene-acrylonitrile rubber composition and application of the vulcanized rubber in an automobile synchronous belt. The hydrogenated butadiene-acrylonitrile rubber composition contains hydrogenated butadiene-acrylonitrile rubber, carbon black, white carbon black, polytetrafluoroethylene micro powder, acrylic acid metal salt, an activating agent, a plasticizer, an anti-aging agent, a peroxide vulcanizing agent and an auxiliary vulcanizing agent, relative to 100 parts of hydrogenated butadiene-acrylonitrile rubber, 25-50 parts of carbon black, 5-15 parts of white carbon black, 3-12 parts of polytetrafluoroethylene micro powder, 5-25 parts of acrylic acid metal salt, 4-15 parts of an activating agent, 3-15 parts of a plasticizer, 1-6 parts of an anti-aging agent, 2-10 parts of a peroxide vulcanizing agent and 1-7 parts of an auxiliary vulcanizing agent are included. The vulcanized rubber prepared from the composition has relatively high mechanical strength and wear resistance and relatively low dynamic heat generation performance.

Description

Technical Field

[0001] The invention relates to the field of rubber, and in particular to a hydrogenated nitrile rubber composition, a vulcanized rubber and a preparation method thereof, and application thereof in an automobile synchronous belt. Background Art

[0002] The synchronous belt is a new type of conveyor belt developed by combining the advantages of belt drive, chain drive and gear drive. Since the transmission method of the synchronous belt is to mesh the teeth and grooves of the gear and the synchronous belt pulley, there will be no non-synchronous transmission between the belt and the pulley due to slip during the transmission process. Compared with chain and gear transmission, the synchronous belt transmission has smooth transmission, small impact, no need for lubrication, no pollution, and low noise. Due to the many advantages of synchronous belt transmission, it has developed very rapidly. Due to the increasing requirements of modern automobiles for energy saving, environmental protection, comfort, safety, etc., the entire engine room structure has become more complex and compact, and the working environment in the engine has become more harsh, so the synchronous belt is required to have excellent mechanical strength, wear resistance and low dynamic heat generation performance.

[0003] Therefore, how to improve the performance of synchronous belt materials has become an important research direction. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that the synchronous belt in the prior art cannot have high mechanical strength, wear resistance and low dynamic heat generation performance. A hydrogenated nitrile rubber composition, a vulcanized rubber and a preparation method thereof, as well as an application in an automobile synchronous belt are provided. The polytetrafluoroethylene micropowder in the hydrogenated nitrile rubber composition has good wear resistance, the metal salt of acrylic acid participates in cross-linking to improve the mechanical properties, the carbon black and the white carbon black play a reinforcing role, and the hydrogenated nitrile rubber and other components in the composition are coordinated, so that the vulcanized rubber prepared from the composition has high mechanical strength and wear resistance, as well as low dynamic heat generation performance.

[0005] In order to achieve the above-mentioned object, the first aspect of the present invention provides a hydrogenated nitrile rubber composition, wherein the hydrogenated nitrile rubber composition contains one or more of hydrogenated nitrile rubber, carbon black, white carbon black, polytetrafluoroethylene powder, acrylic acid metal salt, activator, plasticizer, antioxidant, peroxide vulcanizer and co-vulcanizing agent;

[0006] Relative to 100 parts by weight of hydrogenated nitrile rubber, the content of carbon black is 25-50 parts by weight, the content of white carbon black is 5-15 parts by weight, the content of polytetrafluoroethylene powder is 3-12 parts by weight, the content of acrylic acid metal salt is 5-25 parts by weight, the content of activator is 4-15 parts by weight, the content of plasticizer is 3-15 parts by weight, the content of antioxidant is 1-6 parts by weight, the content of peroxide vulcanizer is 2-10 parts by weight, and the content of co-vulcanizing agent is 1-7 parts by weight.

[0007] The second aspect of the present invention provides a method for preparing vulcanized rubber using the hydrogenated nitrile rubber composition described in the first aspect of the present invention, wherein the method comprises the following steps:

[0008] S1, mixing hydrogenated nitrile rubber, carbon black, white carbon black, polytetrafluoroethylene powder, acrylic acid metal salt, activator, antioxidant and plasticizer for the first time to prepare a masterbatch;

[0009] S2, mixing the peroxide vulcanizing agent, the co-vulcanizing agent and the first stage of the masterbatch for the second time to obtain a final rubber mix;

[0010] S3, vulcanizing the final rubber mixture to obtain vulcanized rubber.

[0011] The third aspect of the present invention provides a vulcanized rubber prepared by the above-mentioned method.

[0012] A fourth aspect of the present invention provides a use of the aforementioned vulcanized rubber in an automobile timing belt.

[0013] Through the above technical solution, the technical solution provided by the present invention has the following beneficial effects:

[0014] The polytetrafluoroethylene powder in the hydrogenated nitrile rubber composition provided by the present invention has good wear resistance, the acrylic acid metal salt participates in cross-linking to improve the mechanical properties, the carbon black and the white carbon black play a reinforcing role, and the hydrogenated nitrile rubber and the peroxide vulcanizing agent and the co-vulcanizing agent in the composition are synergistic, so that the vulcanized rubber prepared from the composition has higher mechanical strength and wear resistance, and the dynamic heat generation of the vulcanized rubber is reduced at the same time. DETAILED DESCRIPTION

[0015] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0016] As mentioned above, the first aspect of the present invention provides a hydrogenated nitrile rubber composition, wherein the hydrogenated nitrile rubber composition contains one or more of hydrogenated nitrile rubber, carbon black, white carbon black, polytetrafluoroethylene powder, acrylic acid metal salt, activator, plasticizer, antioxidant, peroxide vulcanizer and co-vulcanizing agent;

[0017] Relative to 100 parts by weight of hydrogenated nitrile rubber, the content of carbon black is 25-50 parts by weight, the content of white carbon black is 5-15 parts by weight, the content of polytetrafluoroethylene powder is 3-12 parts by weight, the content of acrylic acid metal salt is 5-25 parts by weight, the content of activator is 4-15 parts by weight, the content of plasticizer is 3-15 parts by weight, the content of antioxidant is 1-6 parts by weight, the content of peroxide vulcanizer is 2-10 parts by weight, and the content of co-vulcanizing agent is 1-7 parts by weight.

[0018] In the present invention, the inventors of the present invention have found that when the hydrogenated nitrile rubber composition contains the above-mentioned specific types and specific contents of polytetrafluoroethylene powder and acrylic acid metal salt, since the polytetrafluoroethylene powder has good wear resistance, the acrylic acid metal salt participates in cross-linking to improve the mechanical properties, the vulcanized rubber prepared from the composition can have higher mechanical strength and wear resistance.

[0019] Furthermore, the hydrogenated nitrile rubber composition also contains a specific amount of carbon black and white carbon black, which play a reinforcing role and cooperate with the hydrogenated nitrile rubber and the peroxide vulcanizer and the co-vulcanizer in the composition, so that the vulcanized rubber prepared from the composition can have high mechanical strength and wear resistance while also reducing the dynamic heat generation of the vulcanized rubber.

[0020] Furthermore, the inventors of the present invention have found that: the hydrogenated nitrile rubber composition also contains specific amounts of activators, plasticizers and antioxidants; preferably, when the hydrogenated nitrile rubber composition contains the above-mentioned specific types and specific amounts of components, under the synergistic effect, the vulcanized rubber prepared from the composition can have higher mechanical strength and wear resistance, and at the same time reduce the dynamic heat generation of the vulcanized rubber; if the polytetrafluoroethylene powder component is too high, the polytetrafluoroethylene powder cannot be reinforced and is not easy to disperse, resulting in lower strength and higher heat generation of the vulcanized rubber; if the acrylic metal salt component is too low, the reinforcement effect is poor, resulting in lower strength and poor wear resistance of the vulcanized rubber.

[0021] Further, in the present invention, preferably, relative to 100 parts by weight of hydrogenated nitrile rubber, the content of carbon black is 25-40 parts by weight, the content of white carbon black is 7-13 parts by weight, the content of polytetrafluoroethylene powder is 5-10 parts by weight, the content of acrylic acid metal salt is 10-20 parts by weight, the content of activator is 4-12 parts by weight, the content of plasticizer is 3-15 parts by weight, the content of antioxidant is 2-5 parts by weight, the content of peroxide vulcanizing agent is 2-8 parts by weight, and the content of co-vulcanizing agent is 1-6 parts by weight.

[0022] According to the present invention, the Mooney viscosity ML of the hydrogenated nitrile rubber is 1+4 100℃The content of acrylonitrile is not less than 30 wt %.

[0023] In the present invention, the Mooney viscosity, saturation and acrylonitrile content of the hydrogenated nitrile rubber meet the above ranges, and the mechanical strength of the vulcanized rubber prepared from the composition can be maintained without reducing the processing performance of the composition.

[0024] Furthermore, the Mooney viscosity ML of the hydrogenated nitrile rubber is 1+4 100℃ The content of acrylonitrile is 33-45wt%.

[0025] According to the present invention, the carbon black has an iodine absorption value of 20-90 g / kg and a DBP absorption value of (40-130)×10 -5 m 3 / kg.

[0026] In the present invention, the iodine absorption value and DBP absorption value of the carbon black meet the above ranges, which can better reduce heat generation.

[0027] Furthermore, in a preferred embodiment, the carbon black has an iodine absorption value of 30-90 g / kg and a DBP absorption value of (60-130)×10 -5 m 3 / kg.

[0028] According to the present invention, the specific surface area of ​​the white carbon black is 100-220m 2 / g, preferably 140-190m 2 / g.

[0029] According to the present invention, the acrylic metal salt is at least one selected from zinc acrylate, magnesium acrylate, aluminum acrylate, zinc methacrylate, magnesium methacrylate and aluminum methacrylate.

[0030] According to the present invention, the antioxidant is selected from at least one of amine antioxidants, phenol antioxidants, quinoline antioxidants and benzimidazole antioxidants.

[0031] In the present invention, preferably, the antioxidant is at least one selected from 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, 2-thiolbenzimidazole zinc and 2,2,4-trimethyl-1,2-dihydroquinoline polymer.

[0032] According to the present invention, the plasticizer is selected from at least one of phthalate plasticizers, fatty dibasic acid ester plasticizers, partial phenyl ester plasticizers, ether ester plasticizers and polyester plasticizers.

[0033] In the present invention, preferably, the plasticizer is selected from at least one of trioctyl trimellitate, dioctyl phthalate and di[2-(2-butoxyethoxy)ethyl adipate].

[0034] According to the present invention, the activator is a combination of metal oxides and fatty acids.

[0035] Furthermore, preferably, the weight ratio of the metal oxide to the fatty acid is (3-9):1, preferably (4-6):1.

[0036] According to the present invention, the metal oxide is zinc oxide and / or magnesium oxide.

[0037] According to the present invention, the fatty acid is stearic acid.

[0038] According to the present invention, the peroxide curing agent is at least one selected from dicumyl peroxide, di-tert-butyl diisopropyl peroxide and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

[0039] According to the present invention, the co-vulcanizing agent is selected from at least one of triallyl isocyanurate, triallyl cyanurate, N,N'-m-phenylene bismaleimide, trimethylolpropane triacrylate and trimethylolpropane trimethacrylate.

[0040] A second aspect of the present invention provides a method for preparing vulcanized rubber from the aforementioned hydrogenated nitrile rubber composition, wherein the method comprises the following steps:

[0041] S1, mixing hydrogenated nitrile rubber, carbon black, white carbon black, polytetrafluoroethylene powder, acrylic acid metal salt, activator, antioxidant and plasticizer for the first time to prepare a masterbatch;

[0042] S2, mixing the peroxide vulcanizing agent, the co-vulcanizing agent and the first stage of the masterbatch for the second time to obtain a final rubber mix;

[0043] S3, vulcanizing the final rubber mixture to obtain vulcanized rubber.

[0044] According to the present invention, the method further comprises: subjecting the hydrogenated nitrile rubber to a first mastication.

[0045] In the present invention, after the hydrogenated nitrile rubber is subjected to the first mastication, its processing performance can be improved to meet the needs of further processing such as subsequent mixing.

[0046] According to the present invention, the temperature of the first mastication is 50-90° C.; the time of the first mastication is 0.5-2 min.

[0047] According to the present invention, the mixing temperature of the first mixing is 120-170° C., preferably 135-160° C.; the mixing time of the first mixing is 3-10 min, preferably 4-7 min.

[0048] In the present invention, after the first mixing is completed, in order to obtain a better effect, the product is allowed to stand for a period of time, and the standing time is not particularly limited, for example, it can be 2-24 hours in the present invention.

[0049] Furthermore, the method of the present invention further comprises: after the first mixing is completed, subjecting the first stage of the masterbatch to a second plasticizing, wherein the temperature of the second plasticizing is 50-90° C. and the time of the second plasticizing is 0.5-2 min.

[0050] According to the present invention, the mixing temperature of the second mixing does not exceed 130°C, preferably 90-120°C.

[0051] According to the present invention, the mixing time of the second mixing is 2-7 minutes, preferably 4-5 minutes.

[0052] According to the present invention, the vulcanization conditions include: vulcanization time of 10-45 min, preferably 15-35 min; vulcanization temperature of 150-180° C., preferably 160-180° C.; vulcanization pressure of 3.5-40 MPa, preferably 10-20 MPa.

[0053] In the present invention, unless otherwise specified, all pressures used are gauge pressures.

[0054] The third aspect of the present invention provides a vulcanized rubber prepared by the above-mentioned method.

[0055] In the present invention, the tensile strength of the vulcanized rubber is not less than 22.1 MPa, and the Akron abrasion is not higher than 0.18 cm 3 , compression heat is not higher than 24.8℃.

[0056] Furthermore, the tensile strength of the vulcanized rubber is 22.1-24.5 MPa, and the Akron abrasion is 0.10-0.18 cm 3 , compression heat generation is 22.4-24.8°C; preferably, the tensile strength of the vulcanized rubber is 23.5-24.5MPa, and the Akron abrasion is 0.10-0.12cm 3 , compression heat is 22.4-23.2℃.

[0057] A fourth aspect of the present invention provides a use of the aforementioned vulcanized rubber in an automobile timing belt.

[0058] The present invention will be described in detail below through examples.

[0059] The equipment conditions for preparing the vulcanized rubber in the following examples and comparative examples are shown in Table 1.

[0060] The testing instruments of the vulcanized rubbers prepared in the examples and comparative examples are shown in Table 2, and the testing conditions are shown in Table 3.

[0061] The chemical reagents used in the embodiments and comparative examples are commercially available, as follows:

[0062] Table 1

[0063] Serial number Device Name model Manufacturer 1 Internal Mixer BR1600 Farrar 2 Open Mixing Machine XK-160 Qingdao Xincheng Yiming Machinery Co., Ltd. in China 3 Plate vulcanizing press XLB-D400*400*2 Shanghai No.1 Rubber Machinery Factory in China

[0064] Table 2

[0065]

[0066] Table 3

[0067]

[0068]

[0069] The following chemicals are used in the examples and comparative examples

[0070] Hydrogenated Nitrile Rubber (HNBR):

[0071] 4367, Mooney viscosity ML 1+4 100℃ 61, saturation 94.5%, acrylonitrile content 43wt%, ARLANXEO product;

[0072] 2020L, Mooney viscosity ML 1+4 100℃ 58, saturation 90%, acrylonitrile content 36wt%, Japan Zeon product;

[0073] Carbon black N774, iodine absorption value is 29g / kg, DBP absorption value is 72×10 -5 m 3 / kg, Cabot Chemical (Tianjin) Co., Ltd.;

[0074] Carbon black N550, iodine absorption value is 43g / kg, DBP absorption value is 121×10 -5 m 3 / kg, Cabot Chemical (Tianjin) Co., Ltd.;

[0075] White carbon black 165N, specific surface area 165m 2 / g, Qingdao Rhodia Silica Co., Ltd.;

[0076] Polytetrafluoroethylene powder L-5F, particle size 4 μm, Daikin Fluorochemical (China) Co., Ltd.;

[0077] Acrylic acid metal salt: zinc methacrylate, Science and Technology Chemical (Beijing) Chemical Technology Co., Ltd.;

[0078] Plasticizer: trioctyl trimellitate (TOTM), Shandong Langtai Chemical Co., Ltd.;

[0079] Activators: zinc oxide and stearic acid, both purchased from Weifang Hengfeng Chemical Co., Ltd.

[0080] Antiaging agent: 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), Hubei Xinkang Pharmaceutical Chemical Co., Ltd.; 2-mercaptobenzimidazole zinc (MBZ), Linhai Xinhua Chemical Plant;

[0081] Curing agent: dicumyl peroxide (DCP), Shanghai Fangruida Chemical Co., Ltd.;

[0082] Co-vulcanizing agent: triallyl isocyanurate (TAIC), Shanghai McLean Biochemical Technology Co., Ltd.

[0083] The amounts of components in the following examples and comparative examples are all parts by weight; in addition, "part" or "parts" all refer to "parts by weight".

[0084] Examples 1-7

[0085] S1, the internal mixer is set to a speed of 60rpm, an initial temperature of 70°C, and the hydrogenated nitrile rubber is placed in the internal mixer according to the formula in Table 4, and the first plasticization is performed for 0.5min, and carbon black, white carbon black, polytetrafluoroethylene powder, acrylic acid metal salt, activator, antioxidant, and plasticizer are added. At the first mixing temperature of 155°C, the first mixing is performed for 5min, and the material is discharged. After the material is discharged, it is placed for 4h to obtain a masterbatch;

[0086] S2, the speed of the internal mixer is set to 40 rpm, the initial temperature is 40°C, the masterbatch is subjected to a second plasticizing for 1 min, a vulcanizing agent and a co-vulcanizing agent are added, and a second mixing is carried out at 110°C for 4 min, and the final rubber is obtained;

[0087] S3. The final rubber mixture is subjected to flat plate vulcanization at 170° C., a pressure of 15 MPa, and a time of 20 min to obtain vulcanized rubbers of different experimental specifications, which are marked as S1-S7 respectively.

[0088] Comparative Examples 1-5

[0089] The method is consistent with that in the embodiment, except that the vulcanized rubbers obtained are prepared according to the formulation in Table 5 and are marked as D1-D5 respectively.

[0090] Table 4

[0091]

[0092]

[0093] Table 5

[0094]

[0095]

[0096] Note: “-” in the table means that the component is 0 and is not used.

[0097] The obtained vulcanized rubbers S1-S7 and D1-D5 were subjected to performance tests according to the methods in Table 2 and Table 3. The results are shown in Table 6.

[0098] Table 6

[0099] Sample No. Tensile strength(MPa) Compression heat (℃) <![CDATA[Ackermann abrasion (cm 3 )]]> S1 24.1 23.2 0.10 S2 23.5 22.6 0.12 S3 23.8 22.4 0.11 S4 22.6 23.1 0.18 S5 23.6 22.8 0.10 S6 24.5 24.8 0.17 S7 22.1 24.2 0.15 D1 23.6 29.5 0.12 D2 23.2 22.9 0.28 D3 18.3 23.4 0.15 D4 20.1 26.3 0.14 D5 20.2 24.1 0.18

[0100] It can be seen from the above results that the vulcanized rubber made from the hydrogenated nitrile rubber composition of the present invention can have excellent comprehensive properties such as high strength, low dynamic heat generation, and high wear resistance.

[0101] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A hydrogenated nitrile rubber composition, characterized in that The hydrogenated nitrile rubber composition contains one or more of hydrogenated nitrile rubber, carbon black, white carbon black, polytetrafluoroethylene powder, acrylic acid metal salt, activator, plasticizer, antioxidant, peroxide vulcanizer and co-vulcanizing agent; Relative to 100 parts by weight of hydrogenated nitrile rubber, the content of carbon black is 25-50 parts by weight, the content of white carbon black is 5-15 parts by weight, the content of polytetrafluoroethylene powder is 3-12 parts by weight, the content of acrylic acid metal salt is 5-25 parts by weight, the content of activator is 4-15 parts by weight, the content of plasticizer is 3-15 parts by weight, the content of antioxidant is 1-6 parts by weight, the content of peroxide vulcanizer is 2-10 parts by weight, and the content of co-vulcanizing agent is 1-7 parts by weight.

2. The hydrogenated nitrile rubber composition according to claim 1, wherein Relative to 100 parts by weight of hydrogenated nitrile rubber, the content of carbon black is 25-40 parts by weight, the content of white carbon black is 7-13 parts by weight, the content of polytetrafluoroethylene powder is 5-10 parts by weight, the content of acrylic acid metal salt is 10-20 parts by weight, the content of activator is 4-12 parts by weight, the content of plasticizer is 3-15 parts by weight, the content of antioxidant is 2-5 parts by weight, the content of peroxide vulcanizer is 2-8 parts by weight, and the content of co-vulcanizing agent is 1-6 parts by weight.

3. The hydrogenated nitrile rubber composition according to claim 1 or 2, wherein The Mooney viscosity ML of the hydrogenated nitrile rubber 1+4 100℃ The content of acrylonitrile is not less than 30 wt %.

4. The hydrogenated nitrile rubber composition according to any one of claims 1 to 3, wherein The iodine absorption value of the carbon black is 20-90 g / kg, and the DBP absorption value is (40-130)×10 -5 m 3 / kg; Preferably, the specific surface area of ​​the white carbon black is 100-220m 2 / g.

5. The hydrogenated nitrile rubber composition according to any one of claims 1 to 4, wherein The acrylic acid metal salt is selected from at least one of zinc acrylate, magnesium acrylate, aluminum acrylate, zinc methacrylate, magnesium methacrylate and aluminum methacrylate; Preferably, the antioxidant is selected from at least one of amine antioxidants, phenol antioxidants, quinoline antioxidants and benzimidazole antioxidants; Preferably, the plasticizer is selected from at least one of phthalate plasticizers, fatty dibasic acid ester plasticizers, partial phenyl ester plasticizers, ether ester plasticizers and polyester plasticizers; Preferably, the activator is a combination of a metal oxide and a fatty acid; Preferably, the weight ratio of the metal oxide to the fatty acid is (3-9):1, preferably (4-6):1; Preferably, the metal oxide is zinc oxide and / or magnesium oxide; Preferably, the fatty acid is stearic acid; Preferably, the peroxide curing agent is selected from at least one of dicumyl peroxide, di-tert-butyl diisopropyl peroxide and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane; Preferably, the co-vulcanizing agent is selected from at least one of triallyl isocyanurate, triallyl cyanurate, N,N'-m-phenylene bismaleimide, trimethylolpropane triacrylate and trimethylolpropane trimethacrylate.

6. A method for preparing vulcanized rubber from the hydrogenated nitrile rubber composition according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1, mixing hydrogenated nitrile rubber, carbon black, white carbon black, polytetrafluoroethylene powder, acrylic acid metal salt, activator, antioxidant and plasticizer for the first time to prepare a masterbatch; S2, mixing the peroxide vulcanizing agent, the co-vulcanizing agent and the first stage of the masterbatch for the second time to obtain a final rubber mix; S3, vulcanizing the final rubber mixture to obtain vulcanized rubber.

7. The method according to claim 6, wherein: The method further comprises: performing a first mastication on the hydrogenated nitrile rubber; Preferably, the temperature of the first mastication is 50-90°C; the time of the first mastication is 0.5-2min; And / or, the mixing temperature of the first mixing is 120-170° C., preferably 135-160° C., and the mixing time of the first mixing is 3-10 min, preferably 4-7 min.

8. The preparation method according to claim 6 or 7, wherein: The method further comprises: after the first mixing is completed, performing a second mastication on the masterbatch; Preferably, the temperature of the second mastication is 50-90°C; the time of the second mastication is 0.5-2min; And / or, the mixing temperature of the second mixing is not more than 130° C., and the mixing time of the second mixing is 2-7 min; And / or, the vulcanization conditions include: vulcanization time of 10-45 min, preferably 15-35 min; vulcanization temperature of 150-180° C., preferably 160-180° C.; vulcanization pressure of 3.5-40 MPa, preferably 10-20 MPa.

9. A vulcanized rubber prepared by the method according to any one of claims 6 to 8.

10. Use of the vulcanized rubber according to claim 9 in an automobile timing belt.

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