Composition for producing vulcanized rubber and vulcanized rubber, and method for producing the same and use thereof

Abstract

The present application relates to the field of elastic material, and relates to a composition for preparing vulcanized rubber, and vulcanized rubber and its preparation method and application.The composition comprises: (a) styrene butadiene rubber with a Mooney viscosity of 48-66, 10-100 parts by weight; (b) polypropylene, 40-200 parts by weight; (c) organic peroxide, 1.0-10 parts by weight; (d) antioxidant, 0.1-5 parts by weight; and 100 parts by weight of ethylene propylene diene rubber.The vulcanized rubber prepared from the composition of the present application can obtain excellent mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of elastic materials, and more specifically, to a composition for preparing vulcanized rubber, vulcanized rubber, a method for preparing the same, and its applications. Background Technology

[0002] Vulcanized rubber comprises finely divided rubber particles dispersed in a matrix. These rubber particles are advantageously cross-linked to promote elasticity. The dispersed rubber phase is generally referred to as the discontinuous phase, while the plastic phase is referred to as the continuous phase. Such TPVs are well known and can be prepared by dynamic vulcanization, which refers to the method of curing or vulcanizing rubber with a curing agent in a mixture with at least one thermoplastic polymer while the polymer is being mixed or kneaded at an elevated temperature, preferably above the melting temperature of the thermoplastic polymer. In the production of rubber products, vulcanization is the final processing step. In this step, the rubber undergoes a series of complex chemical reactions, transforming from a linear structure to a three-dimensional structure, losing the plasticity of the compound and acquiring the high elasticity of the cross-linked rubber, thereby obtaining excellent physical and mechanical properties, heat resistance, solvent resistance, and corrosion resistance, improving the service life and scope of rubber products.

[0003] The mechanical properties of rubber are a crucial performance indicator for rubber materials, directly reflecting the quality of rubber products and measuring their usability. These mechanical properties include hardness, stress at a given elongation, tensile strength, elongation at break, and compression set.

[0004] The mechanical properties of existing vulcanized rubber still need to be improved. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem of poor mechanical properties of vulcanized rubber in the prior art, and to provide a composition for preparing vulcanized rubber, vulcanized rubber, preparation method and application thereof, which has excellent mechanical properties.

[0006] To achieve the above objectives, a first aspect of the present invention provides a composition for preparing vulcanized rubber, the composition comprising:

[0007] (a) Styrene-butadiene rubber with Mooney viscosity of 48-66, 10-100 parts by weight;

[0008] (b) Polypropylene, 40-200 parts by weight;

[0009] (c) Organic peroxides, 1.0-10 parts by weight;

[0010] (d) Antioxidant, 0.1-5 parts by weight; and

[0011] 100 parts by weight of EPDM rubber.

[0012] Preferably, the number-average molecular weight of the styrene-butadiene rubber is 200,000-300,000 g / mol.

[0013] Preferably, the number-average molecular weight of the polypropylene is 20,000 to 900,000 g / mol.

[0014] Preferably, the Mooney viscosity of the EPDM rubber is 25-90.

[0015] Preferably, based on the total amount of the EPDM rubber, the EPDM rubber contains 0.5-10 wt% structural units from the unsaturated third monomer, 50-75 wt% structural units from ethylene, and 15-49.5 wt% structural units from propylene.

[0016] Preferably, the organic peroxide is selected from at least one of bis(tert-butylperoxyisopropyl)benzene, tert-butylperoxyisopropylbenzene, 2,5-bis(tert-butylperoxy)-2,5-dimethyl-3-hexyne, benzoyl peroxide, dicumyl peroxide, tert-butyl peroxybenzoate, ditert-butyl peroxide, and 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, and more preferably from at least one of dicumyl peroxide, bis(tert-butylperoxyisopropyl)benzene, and dicumyl peroxide.

[0017] Preferably, the antioxidant is selected from at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), 2,6-di-tert-butyl-p-cresol, 2,2-methylenebis(4-methyl-6-tert-butylphenol) (antioxidant 2246), and 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

[0018] A second aspect of the present invention provides a method for preparing vulcanized rubber, the method comprising:

[0019] (1) Weigh 40-200 parts by weight of polypropylene and 0.1-5 parts by weight of antioxidant and mix them for the first time to obtain the first melt;

[0020] (2) The first melt is mixed and melted with 100 parts by weight of EPDM rubber and 10-100 parts by weight of styrene-butadiene rubber with a Mooney viscosity of 48-66 to obtain the second melt;

[0021] (3) The second melt is subjected to a first granulation to obtain compound particles;

[0022] (4) The compound particles are mixed with 1.0-10 parts by weight of organic peroxide and vulcanized and granulated to obtain vulcanized rubber.

[0023] Preferably, the method includes:

[0024] (1) Weigh 40-200 parts by weight of polypropylene and 0.1-5 parts by weight of antioxidant and mix them in an internal mixer to obtain the first melt;

[0025] (2) Add 100 parts by weight of EPDM rubber and 10-100 parts by weight of styrene-butadiene rubber with a Mooney viscosity of 48-66 to the first melt, and continue to perform the second mixing and melting in the internal mixer to obtain the second melt;

[0026] (3) The second melt is subjected to the first granulation through a single screw extruder to obtain compound granules;

[0027] (4) Mix the compound granules with 1.0-10 parts by weight of organic peroxide, vulcanize and granulate them through a co-rotating twin-screw extruder to obtain vulcanized rubber.

[0028] Preferably, in step (1), the operating conditions of the internal mixer include: the rotor speed of the internal mixer is 60-90 rpm and the temperature is 160-220℃.

[0029] Preferably, in step (2), the operating conditions of the internal mixer include: the rotor speed of the internal mixer is 60-90 rpm and the temperature is 160-220℃.

[0030] Preferably, in step (3), the operating conditions of the single screw extruder include: a screw length-to-diameter ratio of 20-30, a screw speed of 50-200 rpm, and an extrusion temperature of 160-220℃.

[0031] Preferably, in step (4), the operating conditions of the co-rotating twin-screw extruder include: a screw length-to-diameter ratio of 44-65, a screw speed of 50-300 rpm, a main feed speed of 30-50 rpm, a die head temperature of 170-200℃, a screw feed section temperature of 120-170℃, and a screw melt mixing section temperature of 180-220℃.

[0032] A third aspect of the present invention provides a vulcanized rubber prepared by the preparation method described above, wherein the vulcanized rubber has a tensile strength of not less than 3 MPa, an elongation at break of not less than 285%, and a compression set of not more than 45%.

[0033] A fourth aspect of the present invention provides an application of the vulcanized rubber described herein in the automotive and rail transportation fields.

[0034] Through the above technical solution, the present invention has the following beneficial effects:

[0035] The vulcanized rubber prepared from the compositions of the present invention can obtain excellent mechanical properties, such as stronger tensile strength, greater elongation at break and less compression set.

[0036] The preparation method of the present invention can further improve the mechanical properties of vulcanized rubber, which is suitable for the automotive and rail transportation fields. Detailed Implementation

[0037] The endpoints and any values ​​of the ranges disclosed herein 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 the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0038] In this invention, the Mooney viscosity was measured at ML100℃1+4.

[0039] The first aspect of the present invention provides a composition for preparing vulcanized rubber, the composition comprising:

[0040] (a) Styrene-butadiene rubber with Mooney viscosity of 48-66, 10-100 parts by weight;

[0041] (b) Polypropylene, 40-200 parts by weight;

[0042] (c) Organic peroxides, 1.0-10 parts by weight;

[0043] (d) Antioxidant, 0.1-5 parts by weight; and

[0044] 100 parts by weight of EPDM rubber.

[0045] The vulcanized rubber prepared from the composition of the present invention can obtain excellent mechanical properties.

[0046] In this invention, there is no particular limitation on the number-average molecular weight of the styrene-butadiene rubber as long as the objective of the invention can be achieved. According to a preferred embodiment of the invention, the number-average molecular weight of the styrene-butadiene rubber is 200,000-300,000 g / mol. By adopting the aforementioned preferred embodiment, the mechanical properties of the vulcanized rubber can be further improved.

[0047] In this invention, the polypropylene can be a conventional choice in the art. According to a preferred embodiment of the invention, the number-average molecular weight of the polypropylene is 20,000-900,000 g / mol. By adopting the aforementioned preferred embodiment, the mechanical properties of the vulcanized rubber can be further improved.

[0048] In this invention, there is no particular limitation on the Mooney viscosity of the EPDM rubber, as long as the objective of the invention can be achieved. According to a preferred embodiment of the invention, the Mooney viscosity of the EPDM rubber is 25-90. By adopting the aforementioned preferred embodiment, the mechanical properties of the vulcanized rubber can be further improved.

[0049] According to a preferred embodiment of the present invention, based on the total amount of the EPDM rubber, the content of structural units from the unsaturated third monomer in the EPDM rubber is 0.5-10 wt%, the content of structural units from ethylene is 50-75 wt%, and the content of structural units from propylene is 15-49.5 wt%. By adopting the aforementioned preferred embodiment, the mechanical properties of the vulcanized rubber can be further improved.

[0050] In this invention, the organic peroxide can be a conventional selection in the art. According to a preferred embodiment of the invention, the organic peroxide is selected from at least one of bis(tert-butylperoxyisopropyl)benzene, tert-butylperoxyisopropylbenzene, 2,5-bis(tert-butylperoxy)-2,5-dimethyl-3-hexyne, dibenzoyl peroxide, dicumyl peroxide, tert-butyl peroxide, ditert-butyl peroxide, and 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, preferably at least one of dicumyl peroxide, bis(tert-butylperoxyisopropyl)benzene, and dicumyl peroxide. By adopting the aforementioned preferred embodiment, the mechanical properties of vulcanized rubber can be further improved.

[0051] In this invention, the antioxidant can be a conventional choice in the art. According to a preferred embodiment of the invention, the antioxidant is selected from at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), 2,6-di-tert-butyl-p-cresol, 2,2-methylenebis(4-methyl-6-tert-butylphenol) (antioxidant 2246), and 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane. By employing the aforementioned preferred embodiment, the mechanical properties of the vulcanized rubber can be further improved.

[0052] A second aspect of the present invention provides a method for preparing vulcanized rubber, the method comprising:

[0053] (1) Weigh 40-200 parts by weight of polypropylene and 0.1-5 parts by weight of antioxidant and mix them for the first time to obtain the first melt;

[0054] (2) The first melt is mixed and melted with 100 parts by weight of EPDM rubber and 10-100 parts by weight of styrene-butadiene rubber with a Mooney viscosity of 48-66 to obtain the second melt;

[0055] (3) The second melt is subjected to a first granulation to obtain compound particles;

[0056] (4) The compound particles are mixed with 1.0-10 parts by weight of organic peroxide and vulcanized and granulated to obtain vulcanized rubber.

[0057] The preparation method of the present invention can further improve the mechanical properties of vulcanized rubber and make it suitable for the automotive and rail transportation fields.

[0058] According to a preferred embodiment of the present invention, the method includes:

[0059] (1) Weigh 40-200 parts by weight of polypropylene and 0.1-5 parts by weight of antioxidant and mix them in an internal mixer to obtain the first melt;

[0060] (2) Add 100 parts by weight of EPDM rubber and 10-100 parts by weight of styrene-butadiene rubber with a Mooney viscosity of 48-66 to the first melt, and continue to perform the second mixing and melting in the internal mixer to obtain the second melt;

[0061] (3) The second melt is subjected to the first granulation through a single screw extruder to obtain compound granules;

[0062] (4) Mix the compound granules with 1.0-10 parts by weight of organic peroxide, vulcanize and granulate them through a co-rotating twin-screw extruder to obtain vulcanized rubber.

[0063] By adopting the aforementioned preferred scheme, the mechanical properties of vulcanized rubber can be further improved.

[0064] According to a preferred embodiment of the present invention, in step (1), the operating conditions of the internal mixer include: the rotor speed of the internal mixer is 60-90 rpm and the temperature is 160-220℃.

[0065] According to a preferred embodiment of the present invention, in step (2), the operating conditions of the internal mixer include: the rotor speed of the internal mixer is 60-90 rpm and the temperature is 160-220℃.

[0066] According to a preferred embodiment of the present invention, in step (3), the operating conditions of the single-screw extruder include: a screw length-to-diameter ratio of 20-30, a screw speed of 50-200 rpm, and an extrusion temperature of 160-220°C. By adopting the aforementioned preferred scheme, compounded granules can be obtained.

[0067] According to a preferred embodiment of the present invention, in step (4), the operating conditions of the co-rotating twin-screw extruder include: a screw length-to-diameter ratio of 44-65, a screw speed of 50-300 rpm, a main feed speed of 30-50 rpm, a die head temperature of 170-200℃, a screw feed section temperature of 120-170℃, and a screw melt mixing section temperature of 180-220℃. By adopting the aforementioned preferred scheme, vulcanized rubber can be obtained.

[0068] A third aspect of the present invention provides a vulcanized rubber prepared by the preparation method described above, wherein the vulcanized rubber has a tensile strength of not less than 3 MPa, an elongation at break of not less than 285%, and a compression set of not more than 45%.

[0069] A fourth aspect of the present invention provides an application of the vulcanized rubber described herein in the automotive and rail transportation fields.

[0070] The present invention will be described in detail below through embodiments.

[0071] In the following embodiments, unless otherwise specified, all raw materials used are commercially available products:

[0072] Ethylene propylene diene monomer (EPDM) rubber: purchased from Shanghai Sinopec Mitsui Chemicals Co., Ltd., grade 3092PM, Mooney viscosity 61, synthetic raw materials: 4.6 wt% ethylene-norbornene and 65 wt% ethylene.

[0073] Styrene-butadiene rubber: purchased from Sinopec Beijing Yanshan Branch, grade SSBR2506, Mooney viscosity 65±5, vinyl content 30±3wt%, and bound styrene content 25±2wt%.

[0074] Polypropylene: purchased from Sinopec Yangzi Petrochemical Co., Ltd., grade F401, with a number average molecular weight of 380,000-400,000 g / mol and a melt flow rate of 2.5 g / 10 min at 190℃ and a load of 2.16 kg.

[0075] Antioxidants: Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), purchased from Shanghai Jinhai Yabao Fine Chemical Co., Ltd.; 2,2-methylenebis(4-methyl-6-tert-butylphenol) (antioxidant 2246), purchased from Anhui Weichi Chemical Co., Ltd.

[0076] Organic peroxide: dicumyl peroxide, purchased from AkzoNobel China, brand name: BC-FF; bis(tert-butylperoxyisopropyl)benzene, purchased from Hubei Ruijin Chemical Co., Ltd.

[0077] In the following embodiments, the performance involved was obtained through testing using the following methods:

[0078] (1) Hardness: Tested according to standard GB / T 531.1-2008;

[0079] (2) Tensile strength: Tested according to standard GB / T 528-2009;

[0080] (3) Elongation at break: Tested according to standard GB / T 528-2009;

[0081] (4) Compression set: Tested according to standard GB / T 7759-1996.

[0082] Example 1

[0083] The specific formulation of the composition is shown in Table 1;

[0084] The preparation of vulcanized rubber is as follows:

[0085] (1) 160 parts by weight of polypropylene and 0.5 parts by weight of antioxidant 1010 are added to a mixer at 180°C. After the polypropylene melts, 100 parts by weight of EPDM rubber and 100 parts by weight of styrene-butadiene rubber are added. The mixture is melted at high temperature and then mixed to obtain a compound. The mixing conditions include: a rotation speed of 75 rpm and a mixing temperature of 180°C. The compound is then subjected to a first granulation through a single screw extruder to obtain compound granules. The length-to-diameter ratio of the single screw extruder is 20:1. The conditions for the first granulation include: a screw rotation speed of 100 rpm and an extrusion temperature of 200°C.

[0086] (2) The compound granules prepared in step (1) are dynamically vulcanized and granulated with 2 parts by weight of organic peroxide (diisopropylbenzene peroxide) in a co-rotating twin-screw extruder to obtain thermoplastic vulcanized rubber particles. The length-to-diameter ratio of the co-rotating twin-screw extruder is 44:1. The conditions for dynamic vulcanization include: screw speed of 200 rpm, main feed speed of 40 rpm, die head temperature of 180°C, screw feed section temperature of 150°C, and melt mixing section temperature of 180°C.

[0087] Examples 2-5

[0088] The same method as in Example 1 was used, except that the formulation or process parameters of the composition were different, and vulcanized rubber was obtained, as detailed in Table 1.

[0089] Table 1

[0090]

[0091]

[0092] Examples 6-9

[0093] The same method as in Example 1 was used, except that the formulation or process parameters of the composition were different, and vulcanized rubber was obtained, as detailed in Table 1.

[0094] Table 1 (continued 1)

[0095]

[0096]

[0097] Examples 10-13

[0098] The same method as in Example 1 was used, except that the formulation or process parameters of the composition were different, and vulcanized rubber was obtained. In Example 10, the EPDM rubber was purchased from Dow Chemical Company, USA, with the grade 3722P, Mooney viscosity of 20, ethylidene-norbornene content of 0.5%, and ethylene content of 70.5%. In Example 13, a one-step method was used to prepare thermoplastic elastomers by mixing EPDM rubber particles, styrene-butadiene rubber particles, polypropylene particles, antioxidants, organic peroxides, etc., and then directly using a twin-screw extruder for dynamic vulcanization. See Table 1 for details.

[0099] Table 1 (continued 2)

[0100]

[0101]

[0102] Comparative Examples 1-5

[0103] The same method as in Example 1 was used, except that the formulation or process parameters of the composition were different to obtain vulcanized rubber. In Comparative Example 3, the styrene-butadiene rubber used was purchased from Sinopec Qilu Branch, grade 1510, with a Mooney viscosity ML(1+4) of 30 at 100°C. In Comparative Example 5, nitrile rubber was used instead of EPDM rubber. The nitrile rubber was purchased from PetroChina Lanzhou Petrochemical Company, grade 3308E, with a combined acrylonitrile of 32.5-34.5 wt% and a Mooney viscosity of 75-85. See Table 1 for details.

[0104] Table 1 (continued 3)

[0105]

[0106]

[0107] Test case

[0108] The properties of the vulcanized rubbers prepared in the above examples were tested respectively, and the specific results are shown in Table 2.

[0109] Table 2

[0110]

[0111] Table 2 (continued 1)

[0112]

[0113] Table 2 (continued 2)

[0114]

[0115] Table 2 (continued 3)

[0116]

[0117] As can be seen from Tables 1 and 2, the vulcanized rubber obtained using the compositions of the present invention exhibits excellent physical and mechanical properties. For example, compared with Examples 10 (Mounney viscosity of 20, not in the 25-90 range) and 13 (one-step preparation) using the preferred embodiments of the present invention, the vulcanized rubber prepared using Example 1 of the present invention has stronger tensile strength, greater elongation at break, and lower compression set. Compared with Comparative Examples 1-5 that do not employ the technical solutions of the present invention, Examples 1-13 using the solutions of the present invention have significantly better physical and mechanical properties.

[0118] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition for preparing vulcanized rubber, characterized in that, The composition comprises the following components: (a) 10-100 parts by weight of styrene-butadiene rubber with a Mooney viscosity of 48-66 under the conditions of ML100℃1+4; (b) Polypropylene, 40-200 parts by weight; (c) Organic peroxides, 1.0-10 parts by weight; (d) Antioxidant, 0.1-5 parts by weight; and 100 parts by weight of EPDM rubber; The number-average molecular weight of the styrene-butadiene rubber is 200,000-300,000 g / mol; The Mooney viscosity of the EPDM rubber at ML100℃ 1+4 is 25-90. The number-average molecular weight of the polypropylene is 20,000-900,000 g / mol; Based on the total amount of the EPDM rubber, the EPDM rubber contains 0.5-10 wt% structural units from the unsaturated third monomer, 50-75 wt% structural units from ethylene, and 15-49.5 wt% structural units from propylene.

2. The composition according to claim 1, wherein, The organic peroxide is selected from at least one of bis(tert-butylperoxyisopropyl)benzene, tert-butylperoxyisopropylbenzene, 2,5-bis(tert-butylperoxy)-2,5-dimethyl-3-hexyne, benzoyl peroxide, diisopropylbenzene peroxide, tert-butyl peroxybenzoate, ditert-butyl peroxide, and 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane.

3. The composition according to claim 2, wherein, The organic peroxide is selected from at least one of dicumyl peroxide, bis(tert-butylperoxide)benzene, and dicumyl peroxide.

4. The composition according to any one of claims 1-3, wherein, The antioxidant is selected from at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,6-di-tert-butyl-p-cresol, 2,2-methylenebis(4-methyl-6-tert-butylphenol) and 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

5. A method for preparing vulcanized rubber, characterized in that, The method includes: (1) Weigh 40-200 parts by weight of polypropylene and 0.1-5 parts by weight of antioxidant and mix them for the first time to obtain the first melt; the number average molecular weight of the polypropylene is 20,000-900,000 g / mol; (2) The first melt is mixed and melted with 100 parts by weight of EPDM rubber and 10-100 parts by weight of styrene-butadiene rubber with a Mooney viscosity of 48-66 under ML 100℃ 1+4 conditions to obtain a second melt. The number average molecular weight of the styrene-butadiene rubber is 200,000-300,000 g / mol; the Mooney viscosity of the EPDM rubber under ML 100℃ 1+4 conditions is 25-90; based on the total amount of the EPDM rubber, the content of structural units from the unsaturated third monomer in the EPDM rubber is 0.5-10 wt%, the content of structural units from ethylene is 50-75 wt%, and the content of structural units from propylene is 15-49.5 wt%. (3) The second melt is subjected to a first granulation to obtain compound particles; (4) The compound particles are mixed with 1.0-10 parts by weight of organic peroxide and vulcanized and granulated to obtain vulcanized rubber.

6. The preparation method according to claim 5, wherein, The method includes: (1) Weigh 40-200 parts by weight of polypropylene and 0.1-5 parts by weight of antioxidant and mix them in an internal mixer to obtain the first melt; (2) Add 100 parts by weight of EPDM rubber and 10-100 parts by weight of styrene-butadiene rubber with a Mooney viscosity of 48-66 to the first melt, and continue to perform the second mixing and melting in the internal mixer to obtain the second melt; (3) The second melt is subjected to the first granulation through a single screw extruder to obtain compound granules; (4) Mix the compound granules with 1-10 parts by weight of organic peroxide, vulcanize and granulate them through a co-rotating twin-screw extruder to obtain vulcanized rubber.

7. The preparation method according to claim 6, wherein, In step (1), the operating conditions of the internal mixer include: the rotor speed of the internal mixer is 60-90 rpm, and the temperature is 160-220℃; and / or In step (2), the operating conditions of the internal mixer include: the rotor speed of the internal mixer is 60-90 rpm, and the temperature is 160-220℃; and / or In step (3), the operating conditions of the single-screw extruder include: a screw length-to-diameter ratio of 20-30, a screw speed of 50-200 rpm, and an extrusion temperature of 160-220℃; and / or In step (4), the operating conditions of the co-rotating twin-screw extruder include: a screw length-to-diameter ratio of 44-65, a screw speed of 50-300 rpm, a main feed speed of 30-50 rpm, a die head temperature of 170-200℃, a screw feed section temperature of 120-170℃, and a screw melt mixing section temperature of 180-220℃.

8. A vulcanized rubber prepared by the method according to any one of claims 5-7, characterized in that, The vulcanized rubber has a tensile strength of not less than 3 MPa, an elongation at break of not less than 285%, and a compression set of not more than 45%.

9. The application of the vulcanized rubber of claim 8 in the automotive and rail transportation fields.

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