Stretch-resistant high-low temperature-resistant CR / EPDM material and preparation method thereof

Abstract

The invention relates to the technical field of rubber, and discloses a tensile high and low temperature resistant CR / EPDM material and a preparation method thereof.The tensile high and low temperature resistant CR / EPDM material is prepared from, by weight, 60-75 parts of ethylene propylene diene monomer rubber master batch, 25-40 parts of chloroprene rubber master batch, 3-10 parts of modified polyester fiber, 0.7-1.2 parts of vulcanizing agent and the like; the modified polyester fiber has good compatibility with ethylene propylene diene monomer and chloroprene rubber, so that the polyester fiber can be uniformly dispersed in the CR / EPDM material, and the tensile strength, tearing strength and other mechanical properties of the material are greatly improved. And the CR / EPDM material still has relatively high tensile strength after thermal aging, and meanwhile, the low-temperature brittleness temperature is low, so that the CR / EPDM material shows good high and low temperature resistance.

Description

Technical Field

[0001] The present invention relates to the field of rubber technology, in particular to a CR / EPDM material that is tensile-resistant and resistant to high and low temperatures and a preparation method thereof. Background Art

[0002] EPDM rubber has high UV and weather resistance, excellent heat aging resistance, and strong corrosion resistance, and is widely used in wires and cables, sealing gaskets, household appliances, and the automotive industry. Combining EPDM with chloroprene rubber, fluororubber, and nitrile rubber can leverage their respective strengths, resulting in composite rubber materials with improved mechanical properties and high and low temperature resistance.

[0003] Polyester fibers have excellent tensile properties, high modulus, and high breaking strength, making them important for reinforcing polymers such as plastics and rubber. However, polyester fibers have poor compatibility with EPDM and chloroprene rubber, resulting in poor reinforcement. A master's thesis, "Study on the Adhesion and Properties of EPDM and Polyester Cord," reported that surface treatment of polyester fibers using KH550 coupling agent, plasma, and supercritical carbon dioxide improved the interfacial adhesion between the fibers and EPDM. However, this thesis did not improve the tensile strength, heat resistance, and other properties of EPDM. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a CR / EPDM material that is resistant to stretching and high and low temperatures and a preparation method thereof, which improves the compatibility between polyester fiber and EPDM rubber and chloroprene rubber, and solves the problems of poor tensile properties and temperature resistance of CR / EPDM materials.

[0005] The technical solution of the present invention is a CR / EPDM material that is tensile-resistant and resistant to high and low temperatures and a preparation method thereof, comprising 60-75 parts by weight of EPDM 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 an antioxidant, 2.5-3.3 parts by weight of an accelerator, and 0.7-1.2 parts by weight of a vulcanizing agent. The preparation method of the CR / EPDM material is as follows:

[0006] (1) Adding polyester fiber to dimethyl sulfoxide and heating to swell; then adding the polyester fiber to an acetone solution of vinyl acrylamide monomer, adding dropwise an acetone solution of dibenzoyl peroxide, stirring and reacting in a nitrogen atmosphere, filtering, adding the fiber to xylene, heating and stirring, filtering, washing with ethanol, and drying to obtain a modified polyester fiber.

[0007] (2) Add EPDM masterbatch, chloroprene rubber masterbatch, modified polyester fiber and antioxidant into an open mill for mixing, then add accelerator and vulcanizing agent, roll thin pass, large triangle wrap, sheeting, and then vulcanize in a flat vulcanizer 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 vinyl acrylamide monomer to dibenzoyl peroxide is 1 mol:(0.011-0.016) mol.

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

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

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

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

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

[0015] Preferably, the preparation method of EPDM rubber masterbatch comprises: 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 the chloroprene rubber masterbatch comprises: 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.

[0017] Preferably, the preparation method of the vinyl acrylamide monomer is as follows: 4-amino-2-[(tert-butoxycarbonyl)amino]-4-oxobutanoic 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, and amidation reaction is carried out at 15-30° C. with stirring for 12-18 hours, and distillation is carried out under reduced pressure. The product is washed with water and petroleum ether, and after drying, the intermediate product and trifluoroacetic acid are added to dichloromethane, and the reaction is stirred at 20-30° C. for 2-3 hours to remove the Boc protecting group. The product is distilled under reduced pressure, and the product is added to ethyl acetate, extracted with a saturated sodium bicarbonate solution, and the organic layer is separated. Anhydrous sodium sulfate is added, and the filtrate is filtered and distilled under reduced pressure and dried to obtain the vinyl acrylamide monomer.

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

[0019] The beneficial technical effects of the present invention are as follows: using dibenzoyl peroxide as an initiator, vinyl acrylamide monomer is grafted onto polyester fibers to obtain modified polyester fibers, which are then blended and vulcanized with EPDM masterbatch, chloroprene rubber masterbatch, and a vulcanizer to obtain a CR / EPDM material that is tensile-resistant and resistant to high and low temperatures. The surface of the modified polyester fibers is grafted with an alkyl olefin polymer, wherein the alkyl olefin molecular chain is similar to the poly(ethylene-propylene-non-conjugated diene) molecular chain of EPDM, resulting in excellent compatibility between the modified polyester fibers and EPDM. The alkyl olefin polymer contains amino groups and multiple amide bonds, which form strong hydrogen bonds and elimination reactions with the chlorine atoms of chlorinated polyethylene, thereby improving the compatibility between the modified polyester fibers and EPDM, allowing the polyester fibers to be evenly dispersed in the CR / EPDM material, significantly improving the material's mechanical properties such as tensile strength and tear strength. Furthermore, the CR / EPDM material still has a high tensile strength after thermal aging, and has a low low-temperature brittleness temperature, exhibiting excellent high and low temperature resistance. DETAILED DESCRIPTION

[0020] The following describes in detail embodiments of the present invention. The embodiments are exemplary and are only used to explain the present invention, and are not to 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 Materials Trading Co., Ltd.

[0022] Example 1

[0023] (1) Add 30 mmol of 4-amino-2-[(tert-butyloxycarbonyl)amino]-4-oxobutanoic 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 and react at 30°C for 12 hours, distill under reduced pressure, wash the product with water and petroleum ether, and dry the intermediate product and 50 mL of trifluoroacetic acid to 70 mL of dichloromethane, stir and react at 20°C for 3 hours, 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 the filtrate under reduced pressure, and dry to obtain vinyl acrylamide monomer. The reaction formula is:

[0024]

[0025] (2) The polyester fiber was added to dimethyl sulfoxide, heated to 140°C, and swelled for 1.5 hours; then the polyester fiber was added to 1L of acetone solution of vinyl acrylamide monomer with a concentration of 0.4 mol / L, 5mL of acetone solution containing 4.4mmol of dibenzoyl peroxide was added dropwise, heated to 80°C, and stirred in a nitrogen atmosphere for 1.5 hours. After filtering, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain a modified polyester fiber.

[0026] (3) 5 kg of EPDM rubber was plasticized in an internal mixer at 90 ° C for 6 min, and then 800 g of carbon black, 155 g of stearic acid, 25 g of paraffin oil, and 26 g of zinc oxide were added and mixed for 7 min. The material was discharged to obtain an EPDM rubber masterbatch.

[0027] (4) 5 kg of chloroprene rubber was plasticized in an internal mixer at 70°C for 7 min, and then 40 g of stearic acid, 600 g of carbon black, and 200 g of magnesium oxide were added and mixed for 5 min. The mixture was discharged to obtain a chloroprene rubber masterbatch.

[0028] (5) 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 were added to an open mill and mixed for 5 min. Then, 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur were added. The mixture was rolled into a thin layer, rolled into a large triangle, and sheeted. The mixture was then vulcanized for 6 min in a flat vulcanizing press at 180 ° C and a pressure of 12 MPa to obtain a CR / EPDM material that is tensile-resistant and resistant to high and low temperatures.

[0029] Example 2

[0030] (1) Add 33 mmol 4-amino-2-[(tert-butyloxycarbonyl)amino]-4-oxobutanoic acid, 30 mmol 4-penten-1-amine (CAS No. 22537-07-1), 36 mmol 1-hydroxybenzotriazole, and 36 mmol N,N'-diisopropylcarbodiimide to 100 mL N,N-dimethylformamide, stir and react at 15°C for 18 hours, and distill under reduced pressure. Wash the product with water and petroleum ether. After drying, the intermediate product and 60 mL trifluoroacetic acid are added to 85 mL dichloromethane, stir and react at 30°C for 2 hours, and distill under reduced pressure. The product is added to ethyl acetate and extracted with saturated sodium bicarbonate solution. The organic layer is separated, anhydrous sodium sulfate is added, and the filtrate is filtered and distilled under reduced pressure and dried to obtain vinyl acrylamide monomer. The structural formula is

[0031] (2) The polyester fiber was added to dimethyl sulfoxide, heated to 140°C, and swelled for 1.5 hours; then the polyester fiber was added to 1L of 1mol / L acetone solution of vinyl acrylamide monomer, 20mL of acetone solution containing 15mmol dibenzoyl peroxide was added dropwise, heated to 85°C, and stirred in a nitrogen atmosphere for 2 hours. After filtering, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain a modified polyester fiber.

[0032] (3) 5 kg of EPDM rubber was plasticized in an internal mixer at 95 ° C for 5 min, and then 750 g of carbon black, 110 g of stearic acid, 35 g of paraffin oil, and 28 g of zinc oxide were added and mixed for 7 min. The material was discharged to obtain an EPDM rubber masterbatch.

[0033] (4) 5 kg of chloroprene rubber was plasticized in an internal mixer at 85°C for 5 min, and then 65 g of stearic acid, 500 g of carbon black, and 180 g of magnesium oxide were added and mixed for 7 min. The material was discharged to obtain a chloroprene rubber masterbatch.

[0034] (5) 6.7 kg EPDM masterbatch, 3.3 kg chloroprene rubber masterbatch, 0.6 kg modified polyester fiber, 52 g antioxidant 4010NA, and 40 g antioxidant MB were added to an open mill and mixed for 7 min. Then, 172 g accelerator DM, 126 g accelerator TMTD, and 70 g sulfur were added, and the mixture was rolled into a thin layer, wrapped in a large triangle, and produced into a sheet. Then, the mixture was vulcanized in a flat vulcanizing press at 175 ° C and a pressure of 12 MPa for 9 min to obtain a CR / EPDM material that is tensile-resistant and resistant to high and low temperatures.

[0035] Example 3

[0036] (1) The polyester fiber was added to dimethyl sulfoxide, heated to 145°C, and swollen for 1 hour; then the polyester fiber was added to 1 L of an acetone solution of vinyl acrylamide monomer (prepared according to the method of Example 1) with a concentration of 0.7 mol / L, 12 mL of an acetone solution containing 11.2 mmol of dibenzoyl peroxide was added dropwise, and the mixture was heated to 75°C and stirred in a nitrogen atmosphere for 3 hours. After filtering, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain a modified polyester fiber.

[0037] (2) 5 kg of EPDM rubber was plasticized in an internal mixer at 85 ° C for 7 min, and then 900 g of carbon black, 175 g of stearic acid, 32 g of paraffin oil, and 21 g of zinc oxide were added and mixed for 5 min. The material was discharged to obtain an EPDM rubber masterbatch.

[0038] (3) 5 kg of chloroprene rubber was plasticized in an internal mixer at 75°C for 5 min, and then 40 g of stearic acid, 750 g of carbon black, and 150 g of magnesium oxide were added and mixed for 5 min. The mixture was discharged to obtain a chloroprene rubber masterbatch.

[0039] (4) 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 were added to an open mill and mixed for 5 min. Then, 183 g of accelerator DM, 115 g of accelerator TMTD, and 120 g of sulfur were added, and the mixture was rolled into a thin layer, wrapped in a large triangle, and produced into a sheet. Then, the mixture was vulcanized in a flat vulcanizing press at 185 ° C and a pressure of 10 MPa for 5 min to obtain a CR / EPDM material that is tensile-resistant and resistant to high and low temperatures.

[0040] Comparative Example 1: The difference between this comparative example and Example 1 is that polyester fiber is used instead of modified polyester fiber.

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

[0042] Comparative Example 2: The difference between this comparative example and Example 1 is that acrylamide is used instead of vinyl acrylamide monomer.

[0043] (1) The polyester fiber was added to dimethyl sulfoxide, heated to 140°C, and swelled for 1.5 hours; then the polyester fiber was added to 1L of 0.4mol / L acrylamide in acetone solution, 5mL of 4.4mmol of dibenzoyl peroxide in acetone solution was added dropwise, heated to 80°C, and stirred in a nitrogen atmosphere for 1.5 hours. After filtering, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain a modified polyester fiber.

[0044] (2) 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 were added to an open mill and mixed for 5 min. Then, 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur were added, and the mixture was rolled into a thin layer, triangularly wrapped, and sheeted. The mixture was then vulcanized in a flat vulcanizing press at 180 ° C and a pressure of 12 MPa for 6 min to obtain CR / EPDM material.

[0045] Comparative Example 3: The difference between this comparative example and Example 1 is that 4-penten-1-amine is used instead of vinyl acrylamide monomer.

[0046] (1) The polyester fiber was added to dimethyl sulfoxide, heated to 140°C, and swollen for 1.5 hours; then the polyester fiber was added to 1L of 0.4mol / L 4-penten-1-amine acetone solution, 5mL of acetone solution containing 4.4mmol dibenzoyl peroxide was added dropwise, heated to 80°C, and stirred in a nitrogen atmosphere for 1.5 hours. After filtering, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain a modified polyester fiber.

[0047] (2) 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 were added to an open mill and mixed for 5 min. Then, 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur were added, and the mixture was rolled into a thin layer, triangularly wrapped, and sheeted. The mixture was then vulcanized in a flat vulcanizing press at 180 ° C and a pressure of 12 MPa for 6 min to obtain CR / EPDM material.

[0048] Comparative Example 4: The difference between this comparative example and Example 1 is that allylamine monomer is used instead of 4-penten-1-amine.

[0049] (1) Add 30 mmol 4-amino-2-[(tert-butyloxycarbonyl)amino]-4-oxobutanoic acid, 30 mmol allylamine, 30 mmol 1-hydroxybenzotriazole, and 30 mmol N,N'-diisopropylcarbodiimide to 70 mL N,N-dimethylformamide, stir and react at 30°C for 12 hours, and distill under reduced pressure. Wash the product with water and petroleum ether. After drying, add the intermediate product and 50 mL trifluoroacetic acid to 70 mL dichloromethane, stir and react at 20°C for 3 hours, and distill under reduced pressure. Add the product to ethyl acetate and extract with saturated sodium bicarbonate solution. Separate the organic layer, add anhydrous sodium sulfate, filter, distill the filtrate under reduced pressure, and dry to obtain vinyl acrylamide monomer. The structural formula is

[0050] (2) The polyester fiber was added to dimethyl sulfoxide, heated to 140°C, and swelled for 1.5 hours; then the polyester fiber was added to 1L of acetone solution of vinyl acrylamide monomer with a concentration of 0.4 mol / L, 5mL of acetone solution containing 4.4mmol of dibenzoyl peroxide was added dropwise, heated to 80°C, and stirred in a nitrogen atmosphere for 1.5 hours. After filtering, the fiber was added to xylene, heated and stirred, filtered, washed with ethanol, and dried to obtain a modified polyester fiber.

[0051] (3) 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 were added to an open mill and mixed for 5 min. Then, 135 g of accelerator DM, 167 g of accelerator TMTD, and 86 g of sulfur were added, and the mixture was rolled into a thin layer, triangularly wrapped, and sheeted. Then, the mixture was vulcanized in a flat vulcanizing press at 180 ° C and a pressure of 12 MPa for 6 min to obtain CR / EPDM material.

[0052] The tensile strength of CR / EPDM materials was tested according to GB / T 528-2009. The materials were hot-air aged in an aging chamber at 180°C for 7 days. The tensile strength was then tested. The low-temperature brittleness temperature was tested according to GB / T 15256-2014. The tear strength was tested according to GB / T 529-2008.

[0053] Table 1 Properties of CR / EPDM materials

[0054]

[0055] Comparative Example 1: EPDM masterbatch, chloroprene rubber masterbatch, and polyester fiber were blended to obtain a CR / EPDM material with low tensile strength and tear strength. This was mainly because the compatibility of polyester fiber with EPDM and chloroprene rubber was very poor, making it difficult to effectively improve the mechanical properties of the material. The alkyl olefin molecular chain is similar to the poly(ethylene-propylene-non-conjugated diene) molecular chain of EPDM rubber, which makes the modified polyester fiber and EPDM rubber have good compatibility. At the same time, it contains amino groups and multiple amide bonds, which form strong hydrogen bonds and elimination reactions with the chlorine atoms of chlorinated polyethylene, thereby improving the compatibility between the modified polyester fiber and EPDM rubber, allowing the polyester fiber to be evenly dispersed in the CR / EPDM material, greatly improving the material's mechanical properties such as tensile strength and tear strength. In addition, the CR / EPDM material still has a high tensile strength after thermal aging, and the lowest low-temperature brittle temperature is only -61.3°C, showing good high and low temperature resistance.

[0056] In Comparative Example 2, acrylamide is used to graft polyester fibers. The introduced polyacrylamide molecular chains do not contain alkyl olefin molecular chains, and have poor compatibility with EPDM rubber. In addition, the polyacrylamide molecular chains only contain amide bonds but no amino groups, and have low interaction with the chlorine atoms of chlorinated polyethylene. The two have poor compatibility, resulting in weak reinforcement of the polyester fibers and low tensile strength and tear strength of the CR / EPDM material.

[0057] In Comparative Example 3, 4-pentene-1-amine was used to graft polyester fibers. The introduced poly(4-pentene-1-amine) molecular chain did not contain amide bonds, and had low interaction with the chlorine atoms of chlorinated polyethylene. The two had poor compatibility, resulting in low reinforcement effect of the polyester fibers and low tensile strength and tear strength of the CR / EPDM material.

[0058] In Comparative Example 4, the polyester fiber is grafted with vinyl acrylamide monomer. The alkyl chain in the introduced alkyl olefin molecular chain is relatively short, which is not conducive to improving the compatibility between the polyester fiber and the EPDM rubber, resulting in a weaker reinforcement effect of the polyester fiber. The tensile strength and tear strength of the CR / EPDM material are lower than those in 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. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the spirit of the present invention.

Claims

1. A CR / EPDM material that is tensile-resistant and resistant to high and low temperatures, characterized in that: The CR / EPDM material comprises 60-75 parts by weight of EPDM 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 modified polyester fiber comprises: adding the polyester fiber to dimethyl sulfoxide and heating to swell it; then adding the polyester fiber to an acetone solution of vinyl acrylamide monomer, dropwise adding an acetone solution of dibenzoyl peroxide, stirring and reacting in a nitrogen atmosphere, filtering, adding the fiber to xylene, heating and stirring, filtering, washing with ethanol, and drying to obtain the modified polyester fiber.

2. The tensile strength and high and low temperature resistant CR / EPDM material 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 tensile strength and high and low temperature resistant CR / EPDM material according to claim 1, characterized in that: The preparation method of the EPDM rubber masterbatch comprises: plasticizing 100 parts by weight of the 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 the EPDM rubber masterbatch.

4. The tensile strength and high and low temperature resistant CR / EPDM material according to claim 1, characterized in that: The preparation method of the chloroprene rubber masterbatch comprises: 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 tensile strength and high and low temperature resistant CR / EPDM material according to claim 1, characterized in that: The concentration of the acetone solution of the vinyl acrylamide monomer is 0.4-1 mol / L; the ratio of the vinyl acrylamide monomer to dibenzoyl peroxide is 1 mol:(0.011-0.016) mol.

6. The tensile strength and high and low temperature resistant CR / EPDM material according to claim 1, characterized in that: The stirring reaction temperature is 75-85° C., and the reaction time is 1.5-3 h.

7. The tensile strength and high and low temperature resistant CR / EPDM material according to claim 1, characterized in that: The preparation method of the vinyl acrylamide monomer comprises: adding 4-amino-2-[(tert-butoxycarbonyl)amino]-4-oxobutanoic acid, a vinylamine compound, 1-hydroxybenzotriazole, and N,N'-diisopropylcarbodiimide in a ratio of (1-1.1) mol: 1 mol: (1-1.2) mol: (1-1.2) mol to N,N-dimethylformamide, stirring and reacting at 15-30° C. for 12-18 hours, performing reduced pressure distillation, washing the product with water and petroleum ether, drying the intermediate product, and adding trifluoroacetic acid to dichloromethane, stirring and reacting at 20-30° C. for 2-3 hours, performing reduced pressure distillation, adding the product to ethyl acetate, and extracting and separating to obtain the vinyl acrylamide monomer.

8. The tensile strength and high and low temperature resistant CR / EPDM material according to claim 7, characterized in that: The vinylamine compound is 4-penten-1-amine or 5-hexen-1-amine.

9. A method for preparing the tensile-resistant and high-low temperature-resistant CR / EPDM material according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: adding EPDM rubber masterbatch, chloroprene rubber masterbatch, modified polyester fiber and antioxidant into an open mill for mixing, then adding an accelerator and a vulcanizing agent, performing roller wrapping, large triangle wrapping, sheeting, and then vulcanizing in a flat vulcanizing machine to obtain a CR / EPDM material that is tensile-resistant and resistant to high and low temperatures.

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

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