A CR / EPDM material with tensile strength and resistance to high and low temperatures and its preparation method

Abstract

This invention relates to the field of rubber technology and discloses a CR / EPDM material with tensile strength and resistance to high and low temperatures, and its preparation method. The CR / EPDM material of this invention comprises 60-75 parts by weight of EPDM rubber masterbatch, 25-40 parts by weight of chloroprene rubber masterbatch, 3-10 parts by weight of modified polyester fiber, and 0.7-1.2 parts by weight of vulcanizing agent, etc. The modified polyester fiber has good compatibility with EPDM rubber and chloroprene rubber, which allows the polyester fiber to be uniformly dispersed in the CR / EPDM material, greatly improving the tensile strength and tear strength and other mechanical properties of the material. Furthermore, the CR / EPDM material still has high tensile strength after heat aging, and at the same time has a low low-temperature brittleness temperature, exhibiting good resistance to high and low temperatures.

Description

Technical Field

[0001] This invention relates to the field of rubber technology, specifically to a CR / EPDM material with tensile strength and resistance to high and low temperatures, and its preparation method. Background Technology

[0002] Ethylene propylene diene monomer (EPDM) rubber has high UV resistance, excellent heat aging resistance, and strong corrosion resistance, making it widely used in wires and cables, gaskets, household appliances, and the automotive industry. Combining EPDM with neoprene rubber, fluororubber, and nitrile rubber can leverage the advantages of each material, resulting in composite rubber materials with improved mechanical properties and resistance to high and low temperatures.

[0003] Polyester fibers possess excellent tensile properties, high modulus, and high tensile strength, making them important for reinforcing polymer materials such as plastics and rubber. However, the poor compatibility between polyester fibers and EPDM rubber and neoprene rubber results in ineffective reinforcing properties. A master's thesis, "Research on the Bonding and Properties of EPDM Rubber and Polyester Cord," reported on improving the interfacial adhesion between polyester fibers and EPDM rubber through surface treatments using KH550 coupling agent, plasma, and supercritical carbon dioxide. However, this thesis did not improve the tensile strength, temperature resistance, or other properties of EPDM rubber. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a CR / EPDM material with tensile strength and resistance to high and low temperatures, and its preparation method. This improves the compatibility between polyester fiber and EPDM rubber and chloroprene rubber, and solves the problem of poor tensile properties and temperature resistance of CR / EPDM materials.

[0005] The technical solution of this invention: A CR / EPDM material with tensile strength and resistance to high and low temperatures and its preparation method, comprising 60-75 parts by weight of EPDM rubber masterbatch, 25-40 parts by weight of chloroprene rubber masterbatch, 3-10 parts by weight of modified polyester fiber, 0.8-1.3 parts by weight of antioxidant, 2.5-3.3 parts by weight of accelerator, and 0.7-1.2 parts by weight of vulcanizing agent; the preparation method of the CR / EPDM material is as follows:

[0006] (1) Add polyester fiber to dimethyl sulfoxide and heat to swell; then add polyester fiber to acetone solution of vinyl acrylamide monomer, add acetone solution of benzoyl peroxide dropwise, stir and react in nitrogen atmosphere, filter, add fiber to xylene, heat and stir, filter, wash with ethanol, dry to obtain modified polyester fiber.

[0007] (2) Add EPDM masterbatch, chloroprene rubber masterbatch, modified polyester fiber and antioxidant to open mill for refining, then add accelerator and vulcanizing agent, roll thin pass, large triangle wrap, sheet out, and then vulcanize in flat vulcanizing machine to obtain CR / EPDM material with tensile strength and high and low temperature resistance.

[0008] Preferably, the concentration of the acetone solution of vinyl acrylamide monomer in (1) is 0.4-1 mol / L.

[0009] Preferably, the ratio of vinylacrylamide monomer to benzoyl peroxide is 1 mol:(0.011-0.016) mol.

[0010] Preferably, the temperature of the stirring reaction in (1) is 75-85℃ and the reaction time is 1.5-3h.

[0011] Preferably, the start time in (2) is 5-7 minutes.

[0012] Preferably, in (2), the vulcanization temperature in the flat vulcanizing machine is 175-185℃, the pressure is 10-12MPa, and the time is 5-9min.

[0013] Preferably, the antioxidants include antioxidant 4010NA and antioxidant MB.

[0014] Preferably, the accelerator includes accelerator DM and accelerator TMTD; the vulcanizing agent includes sulfur.

[0015] Preferably, the preparation method of EPDM rubber masterbatch includes: plasticizing 100 parts by weight of EPDM rubber in an internal mixer at 85-95°C for 5-7 minutes, then adding 13-18 parts by weight of carbon black, 2.2-3.5 parts by weight of stearic acid, 0.5-0.7 parts by weight of paraffin oil, and 4.2-5.6 parts by weight of zinc oxide, mixing for 5-7 minutes, and discharging to obtain EPDM rubber masterbatch.

[0016] Preferably, the preparation method of chloroprene rubber masterbatch includes: plasticizing 100 parts by weight of chloroprene rubber in an internal mixer at 70-85°C for 5-7 minutes, then adding 0.8-1.3 parts by weight of stearic acid, 10-15 parts by weight of carbon black, and 3-4 parts by weight of magnesium oxide, mixing for 5-7 minutes, and discharging to obtain chloroprene rubber masterbatch.

[0017] Preferably, the method for preparing vinylacrylamide monomer is as follows: 4-amino-2-[(tert-butoxycarbonyl)amino]-4-oxobutyric acid, a vinylamine compound, 1-hydroxybenzotriazole, and N,N'-diisopropylcarbodiimide are added to N,N-dimethylformamide in a ratio of (1-1.1) mol:1 mol:(1-1.2) mol:(1-1.2) mol. The mixture is stirred at 15-30 °C for 12-18 h to carry out an amidation reaction. The product is then distilled under reduced pressure, washed with water and petroleum ether, dried, and the intermediate product and trifluoroacetic acid are added to dichloromethane. The mixture is stirred at 20-30 °C for 2-3 h to remove the Boc protecting group. The product is then distilled under reduced pressure, added to ethyl acetate, extracted with saturated sodium bicarbonate solution, and the organic layer is separated. Anhydrous sodium sulfate is added, the mixture is filtered, and the filtrate is distilled under reduced pressure and dried to obtain the vinylacrylamide monomer.

[0018] Preferably, the vinylamine compound is 4-penten-1-amine or 5-hexen-1-amine.

[0019] The beneficial technical effects of this invention are as follows: Using benzoyl peroxide as an initiator, vinyl acrylamide monomer is grafted onto polyester fibers to obtain modified polyester fibers. These modified fibers are then blended and vulcanized with EPDM rubber masterbatch, chloroprene rubber masterbatch, and a vulcanizing machine to obtain a CR / EPDM material with high tensile strength and resistance to high and low temperatures. The modified polyester fibers are grafted with alkyl olefin polymers, whose molecular chains are similar to the poly(ethylene-propylene-non-conjugated diene) molecular chains of EPDM rubber, resulting in good compatibility between the modified polyester fibers and EPDM rubber. Furthermore, the presence of amino groups and multiple amide bonds allows for strong hydrogen bonding and elimination reactions with the chlorine atoms of chlorinated polyethylene, further enhancing the compatibility between the modified polyester fibers and EPDM rubber. This enables the polyester fibers to be uniformly dispersed in the CR / EPDM material, significantly improving its tensile strength and tear strength. Moreover, the CR / EPDM material retains high tensile strength after heat aging and exhibits a low low-temperature brittleness temperature, demonstrating excellent resistance to high and low temperatures. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following EPDM rubber model Mitsui 3112PM and chloroprene rubber model CR3222 are both sourced from Guangzhou Shuangli Rubber Raw Material Trading Co., Ltd.

[0022] Example 1

[0023] (1) Add 30 mmol of 4-amino-2-[(tert-butoxycarbonyl)amino]-4-oxobutyric acid (CAS No. 142847-17-4), 30 mmol of 5-hexen-1-amine (CAS No. 34825-70-2), 30 mmol of 1-hydroxybenzotriazole, and 30 mmol of N,N'-diisopropylcarbodiimide to 70 mL of N,N-dimethylformamide. Stir at 30 °C for 12 h, distill under reduced pressure, wash the product with water and petroleum ether, and dry to obtain the intermediate product. Add 50 mL of trifluoroacetic acid to 70 mL of dichloromethane, stir at 20 °C for 3 h, distill under reduced pressure, add the product to ethyl acetate, extract with saturated sodium bicarbonate solution, separate the organic layer, add anhydrous sodium sulfate, filter, distill under reduced pressure, and dry to obtain vinylacrylamide monomer. The reaction formula is:

[0024]

[0025] (2) Polyester fiber was added to dimethyl sulfoxide and heated to 140°C for 1.5 h to swell. Then, polyester fiber was added to 1 L of acetone solution of vinyl acrylamide monomer with a concentration of 0.4 mol / L, and 5 mL of acetone solution containing 4.4 mmol benzoyl peroxide was added dropwise. The mixture was heated to 80°C and stirred under a nitrogen atmosphere for 1.5 h. After filtration, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain modified polyester fiber.

[0026] (3) Put 5 kg of EPDM rubber into a mixer and plasticize it at 90°C for 6 min. Then add 800 g of carbon black, 155 g of stearic acid, 25 g of paraffin oil and 26 g of zinc oxide, mix for 7 min, and discharge to obtain EPDM masterbatch.

[0027] (4) Put 5 kg of chloroprene rubber in a mixer and plasticize it at 70°C for 7 min. Then add 40 g of stearic acid, 600 g of carbon black, and 200 g of magnesium oxide and mix for 5 min. Discharge the mixture to obtain chloroprene rubber masterbatch.

[0028] (5) Add 7.5 kg of EPDM masterbatch, 2.5 kg of chloroprene rubber masterbatch, 0.3 kg of modified polyester fiber, 68 g of antioxidant 4010NA, and 34 g of antioxidant MB to a two-roll mill and start milling for 5 min. Then add 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur. Perform roll wrapping, large triangle wrapping, and sheeting. Then vulcanize in a flat vulcanizing machine at 180°C and 12 MPa pressure for 6 min to obtain CR / EPDM material with tensile strength and resistance to high and low temperatures.

[0029] Example 2

[0030] (1) Add 33 mmol of 4-amino-2-[(tert-butoxycarbonyl)amino]-4-oxobutyric acid, 30 mmol of 4-penten-1-amine (CAS No. 22537-07-1), 36 mmol of 1-hydroxybenzotriazole, and 36 mmol of N,N'-diisopropylcarbodiimide to 100 mL of N,N-dimethylformamide. Stir and react at 15 °C for 18 h. Distill under reduced pressure, wash the product with water and petroleum ether, and dry. Add the intermediate product and 60 mL of trifluoroacetic acid to 85 mL of dichloromethane. Stir and react at 30 °C for 2 h. Distill under reduced pressure, add the product to ethyl acetate, extract with saturated sodium bicarbonate solution, separate the organic layer, add anhydrous sodium sulfate, filter, distill under reduced pressure, and dry to obtain vinylacrylamide monomer. The structural formula is:

[0031] (2) Add polyester fiber to dimethyl sulfoxide and heat to 140°C to swell for 1.5 h; then add polyester fiber to 1 L of acetone solution of vinyl acrylamide monomer with a concentration of 1 mol / L, add 20 mL of acetone solution containing 15 mmol / L benzoyl peroxide, heat to 85°C, stir and react for 2 h in a nitrogen atmosphere, filter, add fiber to xylene, heat and stir, filter, wash with ethanol, dry to obtain modified polyester fiber.

[0032] (3) Put 5 kg of EPDM rubber into a mixer and plasticize it at 95°C for 5 min. Then add 750 g of carbon black, 110 g of stearic acid, 35 g of paraffin oil and 28 g of zinc oxide, mix for 7 min, and discharge to obtain EPDM masterbatch.

[0033] (4) Put 5 kg of chloroprene rubber into a mixer and plasticize it at 85°C for 5 min. Then add 65 g of stearic acid, 500 g of carbon black, and 180 g of magnesium oxide and mix for 7 min. Discharge the mixture to obtain chloroprene rubber masterbatch.

[0034] (5) Add 6.7 kg of EPDM masterbatch, 3.3 kg of chloroprene rubber masterbatch, 0.6 kg of modified polyester fiber, 52 g of antioxidant 4010NA, and 40 g of antioxidant MB to a two-roll mill and start milling for 7 min. Then add 172 g of accelerator DM, 126 g of accelerator TMTD, and 70 g of sulfur. Perform roll wrapping, large triangle wrapping, and sheeting. Then vulcanize in a flat vulcanizing machine at 175°C and 12 MPa pressure for 9 min to obtain CR / EPDM material with tensile strength and resistance to high and low temperatures.

[0035] Example 3

[0036] (1) Polyester fibers were added to dimethyl sulfoxide and heated to 145°C for 1 hour to swell. Then, polyester fibers were added to 1 L of acetone solution containing 0.7 mol / L vinyl acrylamide monomer (prepared according to the method in Example 1), and 12 mL of acetone solution containing 11.2 mmol benzoyl peroxide was added dropwise. The mixture was heated to 75°C and stirred under a nitrogen atmosphere for 3 hours. After filtration, the fibers were added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain modified polyester fibers.

[0037] (2) Put 5 kg of EPDM rubber into a mixer and plasticize it at 85°C for 7 min. Then add 900 g of carbon black, 175 g of stearic acid, 32 g of paraffin oil and 21 g of zinc oxide, mix for 5 min, and discharge to obtain EPDM masterbatch.

[0038] (3) Put 5 kg of chloroprene rubber in a mixer and plasticize it at 75°C for 5 min. Then add 40 g of stearic acid, 750 g of carbon black, and 150 g of magnesium oxide and mix for 5 min. Discharge the mixture to obtain chloroprene rubber masterbatch.

[0039] (4) Add 6 kg of EPDM masterbatch, 4 kg of chloroprene rubber masterbatch, 1 kg of modified polyester fiber, 90 g of antioxidant 4010NA, and 28 g of antioxidant MB to a two-roll mill and start milling for 5 min. Then add 183 g of accelerator DM, 115 g of accelerator TMTD, and 120 g of sulfur. Perform roll wrapping, large triangle wrapping, and sheeting. Then vulcanize in a flat vulcanizing machine at 185°C and 10 MPa pressure for 5 min to obtain CR / EPDM material with tensile strength and resistance to high and low temperatures.

[0040] Comparative Example 1 differs from Example 1 in that polyester fiber is used instead of modified polyester fiber.

[0041] (1) 7.5 kg of EPDM masterbatch, 2.5 kg of chloroprene rubber masterbatch, 0.3 kg of polyester fiber, 68 g of antioxidant 4010NA, and 34 g of antioxidant MB were added to the open mill and milled for 5 min. Then, 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur were added. The mixture was then rolled, rolled into a large triangle, and sheeted. Finally, it was vulcanized in a flat vulcanizing machine at 180°C and 12 MPa pressure for 6 min to obtain CR / EPDM material.

[0042] Comparative Example 2 differs from Example 1 in that acrylamide is used instead of vinylacrylamide monomer.

[0043] (1) Polyester fiber was added to dimethyl sulfoxide and heated to 140°C for swelling for 1.5 h. Then, polyester fiber was added to 1 L of acetone solution of acrylamide with a concentration of 0.4 mol / L, and 5 mL of acetone solution containing 4.4 mmol benzoyl peroxide was added dropwise. The mixture was heated to 80°C and stirred under a nitrogen atmosphere for 1.5 h. After filtration, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain modified polyester fiber.

[0044] (2) Add 7.5 kg of EPDM masterbatch, 2.5 kg of chloroprene rubber masterbatch, 0.3 kg of modified polyester fiber, 68 g of antioxidant 4010NA, and 34 g of antioxidant MB to a two-roll mill and start milling for 5 min. Then add 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur. Perform roll wrapping, large triangle wrapping, and sheeting. Then vulcanize in a flat vulcanizing machine at 180°C and 12 MPa pressure for 6 min to obtain CR / EPDM material.

[0045] Comparative Example 3 differs from Example 1 in that 4-penten-1-amine is used instead of the vinylacrylamide monomer.

[0046] (1) Polyester fiber was added to dimethyl sulfoxide and heated to 140°C for swelling for 1.5 h. Then, polyester fiber was added to 1 L of acetone solution of 0.4 mol / L 4-penten-1-amine, and 5 mL of acetone solution containing 4.4 mmol benzoyl peroxide was added dropwise. The mixture was heated to 80°C and stirred under a nitrogen atmosphere for 1.5 h. After filtration, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain modified polyester fiber.

[0047] (2) Add 7.5 kg of EPDM masterbatch, 2.5 kg of chloroprene rubber masterbatch, 0.3 kg of modified polyester fiber, 68 g of antioxidant 4010NA, and 34 g of antioxidant MB to a two-roll mill and start milling for 5 min. Then add 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur. Perform roll wrapping, large triangle wrapping, and sheeting. Then vulcanize in a flat vulcanizing machine at 180°C and 12 MPa pressure for 6 min to obtain CR / EPDM material.

[0048] Comparative Example 4 differs from Example 1 in that it uses allylamine monomer instead of 4-penten-1-amine.

[0049] (1) Add 30 mmol of 4-amino-2-[(tert-butoxycarbonyl)amino]-4-oxobutyric acid, 30 mmol of allylamine, 30 mmol of 1-hydroxybenzotriazole, and 30 mmol of N,N'-diisopropylcarbodiimide to 70 mL of N,N-dimethylformamide. Stir and react at 30 °C for 12 h. Distill under reduced pressure, wash the product with water and petroleum ether, and dry. Add the intermediate product and 50 mL of trifluoroacetic acid to 70 mL of dichloromethane. Stir and react at 20 °C for 3 h. Distill under reduced pressure, add the product to ethyl acetate, extract with saturated sodium bicarbonate solution, separate the organic layer, add anhydrous sodium sulfate, filter, distill under reduced pressure, and dry to obtain vinylacrylamide monomer. The structural formula is:

[0050] (2) Polyester fiber was added to dimethyl sulfoxide and heated to 140°C for 1.5 h to swell. Then, polyester fiber was added to 1 L of acetone solution of vinyl acrylamide monomer with a concentration of 0.4 mol / L, and 5 mL of acetone solution containing 4.4 mmol benzoyl peroxide was added dropwise. The mixture was heated to 80°C and stirred under a nitrogen atmosphere for 1.5 h. After filtration, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain modified polyester fiber.

[0051] (3) Add 7.5 kg of EPDM masterbatch, 2.5 kg of chloroprene rubber masterbatch, 0.3 kg of modified polyester fiber, 68 g of antioxidant 4010NA, and 34 g of antioxidant MB to a two-roll mill and start milling for 5 min. Then add 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur. Perform roll wrapping, large triangle wrapping, and sheeting. Then vulcanize in a flat vulcanizing machine at 180°C and 12 MPa pressure for 6 min to obtain CR / EPDM material.

[0052] The tensile strength of CR / EPDM material was tested according to GB / T 528-2009 standard. The CR / EPDM material was placed in an aging test chamber for hot air aging at 180℃ for 7 days. Tensile strength was then tested again. Low-temperature brittleness temperature was tested according to GB / T 15256-2014 standard. Tear strength was tested according to GB / T529-2008 standard.

[0053] Table 1 Properties of CR / EPDM Materials

[0054]

[0055] Comparative Example 1 involved blending EPDM rubber masterbatch, chloroprene rubber masterbatch, and polyester fiber. The resulting CR / EPDM material exhibited low tensile and tear strength, primarily due to the poor compatibility between polyester fiber and both EPDM and chloroprene rubber, hindering effective improvement of the material's mechanical properties. The modified polyester fibers added in each example were grafted with alkyl olefin polymers. The alkyl olefin molecular chains are similar to the poly(ethylene-propylene-non-conjugated diene) molecular chains of EPDM rubber, resulting in good compatibility between the modified polyester fibers and EPDM rubber. Furthermore, the presence of amino groups and multiple amide bonds allows for strong hydrogen bonding and elimination reactions with the chlorine atoms of chlorinated polyethylene, further enhancing the compatibility between the modified polyester fibers and EPDM rubber. This enables the polyester fibers to be uniformly dispersed in the CR / EPDM material, significantly improving its tensile strength and tear strength. Moreover, the CR / EPDM material retains high tensile strength even after heat aging, with a minimum low-temperature brittleness temperature of only -61.3℃, demonstrating excellent high and low temperature resistance.

[0056] Comparative Example 2 uses acrylamide to graft polyester fibers. The introduced polyacrylamide molecular chain does not contain alkyl olefin molecular chains, resulting in poor compatibility with EPDM rubber. Furthermore, it only contains amide bonds and does not contain amino groups, leading to low interaction with the chlorine atoms of chlorinated polyethylene. This poor compatibility results in weak reinforcement of the polyester fibers and low tensile and tear strength of the CR / EPDM material.

[0057] Comparative Example 3 uses 4-penten-1-amine to graft polyester fibers. The introduced poly(4-penten-1-amine) molecular chain does not contain amide bonds, and its interaction with the chlorine atoms of chlorinated polyethylene is low. The two have poor compatibility, resulting in low reinforcement effect of polyester fibers and low tensile strength and tear strength of CR / EPDM materials.

[0058] Comparative Example 4 uses vinyl acrylamide monomer to graft polyester fibers. The alkyl chain in the introduced alkyl olefin molecular chain is relatively short, which is not conducive to improving the compatibility between polyester fibers and EPDM rubber. As a result, the reinforcing effect of polyester fibers is weak, and the tensile strength and tear strength of CR / EPDM material are lower than those of Example 1.

[0059] The present invention has been described in detail above with reference to the embodiments. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A CR / EPDM material with tensile strength and resistance to high and low temperatures, characterized in that, The CR / EPDM material comprises 60-75 parts by weight of EPDM rubber masterbatch, 25-40 parts by weight of chloroprene rubber masterbatch, 3-10 parts by weight of modified polyester fiber, 0.8-1.3 parts by weight of antioxidant, 2.5-3.3 parts by weight of accelerator, and 0.7-1.2 parts by weight of vulcanizing agent. The method for preparing the modified polyester fiber includes: adding polyester fiber to dimethyl sulfoxide and heating to swell; then adding polyester fiber to an acetone solution of alkenyl monomer, adding acetone solution of benzoyl peroxide dropwise, stirring and reacting under a nitrogen atmosphere, filtering, adding the fiber to xylene, heating and stirring, filtering, washing with ethanol, and drying to obtain the modified polyester fiber. The alkenyl monomer is prepared by adding 4-amino-2-[(tert-butoxycarbonyl)amino]-4-oxobutyric acid, a vinylamine compound, 1-hydroxybenzotriazole, and N,N'-diisopropylcarbodiimide to N,N-dimethylformamide in a ratio of (1-1.1)mol:1mol:(1-1.2)mol:(1-1.2)mol. The mixture is stirred at 15-30℃ for 12-18h, then distilled under reduced pressure and washed with water and petroleum ether to obtain an intermediate product. The dried intermediate product and trifluoroacetic acid are added to dichloromethane and stirred at 20-30℃ for 2-3h. The mixture is then distilled under reduced pressure, and the product is added to ethyl acetate for extraction and separation to obtain the alkenyl monomer. The vinylamine compound is 4-penten-1-amine or 5-hexen-1-amine.

2. The CR / EPDM material with tensile strength and resistance to high and low temperatures according to claim 1, characterized in that, The antioxidants include antioxidant 4010NA and antioxidant MB; the accelerators include accelerator DM and accelerator TMTD; and the vulcanizing agent includes sulfur.

3. The CR / EPDM material with tensile strength and resistance to high and low temperatures according to claim 1, characterized in that, The preparation method of the EPDM rubber masterbatch includes: plasticizing 100 parts by weight of EPDM rubber in an internal mixer at 85-95℃ for 5-7 minutes, then adding 13-18 parts by weight of carbon black, 2.2-3.5 parts by weight of stearic acid, 0.5-0.7 parts by weight of paraffin oil, and 4.2-5.6 parts by weight of zinc oxide, mixing for 5-7 minutes, and discharging to obtain the EPDM rubber masterbatch.

4. The CR / EPDM material with tensile strength and resistance to high and low temperatures according to claim 1, characterized in that, The method for preparing the chloroprene rubber masterbatch includes: plasticizing 100 parts by weight of chloroprene rubber in an internal mixer at 70-85°C for 5-7 minutes, then adding 0.8-1.3 parts by weight of stearic acid, 10-15 parts by weight of carbon black, and 3-4 parts by weight of magnesium oxide, mixing for 5-7 minutes, and discharging to obtain the chloroprene rubber masterbatch.

5. The CR / EPDM material with tensile strength and resistance to high and low temperatures according to claim 1, characterized in that, The concentration of the acetone solution of the alkenyl monomer is 0.4-1 mol / L; the ratio of alkenyl monomer to benzoyl peroxide is 1 mol:(0.011-0.016) mol.

6. The CR / EPDM material with tensile strength and resistance to high and low temperatures according to claim 1, characterized in that, In the preparation method of the modified polyester fiber, the reaction temperature during stirring in a nitrogen atmosphere is 75-85℃, and the reaction time is 1.5-3h.

7. A method for preparing a CR / EPDM material with tensile strength and resistance to high and low temperatures as described in any one of claims 1-6, characterized in that, The preparation method is as follows: EPDM masterbatch, chloroprene rubber masterbatch, modified polyester fiber, and antioxidant are added to a two-roll mill for two-roll milling, then accelerator and vulcanizing agent are added, and the mixture is rolled thinly, triangularly wrapped, and sheeted out. Then it is vulcanized in a flat vulcanizing machine to obtain CR / EPDM material with tensile strength and resistance to high and low temperatures.

8. The method for preparing the tensile-resistant and high / low temperature resistant CR / EPDM material according to claim 7, characterized in that, The initial rolling time is 5-7 minutes; the vulcanization temperature in the flat vulcanizing machine is 175-185℃, the pressure is 10-12MPa, and the time is 5-9 minutes.

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