Ethylene propylene diene monomer / polypropylene thermoplastic elastomer composition, ethylene propylene diene monomer / polypropylene thermoplastic elastomer and preparation method and application thereof

Abstract

The invention relates to the technical field of polymer composite material production, and discloses an ethylene propylene diene monomer / polypropylene thermoplastic elastomer composition, an ethylene propylene diene monomer / polypropylene thermoplastic elastomer, and a preparation method and application thereof. The thermoplastic elastomer composition comprises ethylene propylene diene monomer, polypropylene, a cross-linking agent and a co-cross-linking agent, wherein the use amount of the ethylene propylene diene monomer is 30-80 parts by weight, the use amount of the polypropylene is 10-50 parts by weight, the use amount of the cross-linking agent is 0.1-1 part by weight, the use amount of the co-cross-linking agent is 0.5-6 parts by weight, and the diene monomer of the ethylene propylene diene monomer contains 5-vinyl-2-norbornene. According to the ethylene propylene diene monomer / polypropylene thermoplastic elastomer composition and the ethylene propylene diene monomer / polypropylene thermoplastic elastomer, the dosage of the cross-linking agent is low, and the comprehensive performance is excellent.

Description

Technical Field

[0001] This invention relates to the field of polymer composite material production technology, specifically to a EPDM / polypropylene thermoplastic elastomer composition, an EPDM / polypropylene thermoplastic elastomer, its preparation method, and its application. Background Technology

[0002] As a "third-generation rubber," EPDM / PP thermoplastic elastomer materials are gradually replacing traditional thermosetting rubbers due to their excellent elastomer properties, ease of molding and processing, recyclability, energy saving, and environmental friendliness.

[0003] EPDM / PP thermoplastic elastomers are produced using EPDM / PP as the base material through a dynamic vulcanization process. Currently, industrial production mainly uses a peroxide vulcanization system. While conventional EPDM rubber uses more peroxides during vulcanization, the degree of vulcanization reaction is insufficient, resulting in limited crosslinking efficiency. This easily leads to poor overall physical properties of TPV materials, and the decomposition products of residual peroxides during dynamic vulcanization produce a strong odor, while also increasing costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems existing in the prior art of dynamic vulcanization of EPDM / polypropylene thermoplastic elastomer materials in peroxide systems, and to provide an EPDM / polypropylene thermoplastic elastomer composition, an EPDM / polypropylene thermoplastic elastomer, its preparation method and application. The EPDM / polypropylene thermoplastic elastomer composition and the EPDM / polypropylene thermoplastic elastomer have a low amount of crosslinking agent and excellent comprehensive performance (especially excellent mechanical properties, heat aging properties and compression set properties).

[0005] To achieve the above objectives, the present invention provides a EPDM / polypropylene thermoplastic elastomer composition, wherein the thermoplastic elastomer composition comprises EPDM, polypropylene, a crosslinking agent, and a co-crosslinking agent; wherein the amount of EPDM is 30-80 parts by weight, the amount of polypropylene is 10-50 parts by weight, the amount of crosslinking agent is 0.1-1 parts by weight, the amount of co-crosslinking agent is 0.5-6 parts by weight, and the diene monomer of the EPDM contains 5-vinyl-2-norbornene (VNB).

[0006] Preferably, the amount of EPDM rubber is 40-50 parts by weight, the amount of polypropylene is 15-30 parts by weight, the amount of crosslinking agent is 0.3-0.5 parts by weight, and the amount of co-crosslinking agent is 2-3 parts by weight.

[0007] Preferably, the weight-average molecular weight of the EPDM rubber is 100,000 to 1,000,000, and more preferably 300,000 to 900,000.

[0008] Preferably, based on the total weight of the EPDM rubber, the content of the ethylene structural unit is 50-70% by weight, preferably 55-65% by weight; and the content of the 5-vinyl-2-norbornene structural unit is 0.5-4.5% by weight, preferably 1.5-3% by weight.

[0009] Preferably, the diene monomer of the EPDM rubber is 5-vinyl-2-norbornene.

[0010] Preferably, the crosslinking agent is selected from one or more of dicumyl peroxide, benzoyl peroxide, diisopropylphenyl peroxide, di-tert-butyl peroxide, and tert-butyl peroxybenzoate, and is more preferably di(2-tert-butylperoxyisopropyl)benzene; or the crosslinking agent is selected from crosslinking agents with ethylene propylene rubber as a carrier, and is more preferably dicumyl peroxide with ethylene propylene rubber as a carrier and / or di(2-tert-butylperoxyisopropyl)benzene with ethylene propylene rubber as a carrier.

[0011] Preferably, the co-crosslinking agent is selected from triallyl cyanurate and / or triallyl isocyanate.

[0012] Preferably, the thermoplastic elastomer composition further contains a softener selected from one or more paraffinic rubber oils.

[0013] Preferably, the amount of the softener is 10-50 parts by weight, and more preferably 25-30 parts by weight.

[0014] Preferably, the thermoplastic elastomer composition further contains an antioxidant selected from one or more of antioxidants RD, MB, and 1010.

[0015] Preferably, the antioxidant is used in an amount of 0.1-2 parts by weight, more preferably 0.5-1.5 parts by weight.

[0016] According to a second aspect of the present invention, a method for preparing an ethylene propylene diene monomer (EPDM) / polypropylene thermoplastic elastomer is provided, wherein the EPDM / polypropylene thermoplastic elastomer is prepared using the EPDM / polypropylene thermoplastic elastomer composition described in the first aspect of the present invention.

[0017] Preferably, the method includes: premixing the EPDM / polypropylene thermoplastic elastomer composition and then vulcanizing and extruding it in a twin-screw extruder.

[0018] Preferably, the conditions for the vulcanization extrusion include: a temperature of 150-250°C, a rotation speed of 200-1000 rpm, and a time of 0.5-2 min.

[0019] According to a third aspect of the present invention, a EPDM / polypropylene thermoplastic elastomer is provided, wherein the EPDM / polypropylene thermoplastic elastomer is prepared by the preparation method of the EPDM / polypropylene thermoplastic elastomer described in the second aspect of the present invention.

[0020] According to a fourth aspect of the present invention, the application of the EPDM / polypropylene thermoplastic elastomer composition of the first aspect of the present invention or the EPDM / polypropylene thermoplastic elastomer of the second aspect of the present invention in at least one of automotive parts, building materials, wires and cables, and household appliances is provided.

[0021] Through the above technical solution, the EPDM / polypropylene thermoplastic elastomer composition of the present invention contains EPDM rubber with a specific structure. In conjunction with other components in the composition, the obtained thermoplastic elastomer composition can reduce the amount of crosslinking agent used during dynamic vulcanization, thereby reducing costs and improving the crosslinking efficiency of the vulcanization reaction. This reduces the odor of the product and improves the overall performance of the thermoplastic elastomer obtained by dynamic vulcanization of the composition (especially its excellent mechanical properties, heat aging properties, and compression set properties). Detailed Implementation

[0022] 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.

[0023] According to a first aspect of the present invention, a EPDM / polypropylene thermoplastic elastomer composition is provided, wherein the thermoplastic elastomer composition comprises EPDM, polypropylene, a crosslinking agent, and a co-crosslinking agent; wherein the amount of EPDM is 30-80 parts by weight, the amount of polypropylene is 10-50 parts by weight, the amount of crosslinking agent is 0.1-1 parts by weight, the amount of co-crosslinking agent is 0.5-6 parts by weight, and the diene monomer of the EPDM contains 5-vinyl-2-norbornene.

[0024] In this invention, preferably, the amount of EPDM rubber is 40-50 parts by weight, the amount of polypropylene is 15-30 parts by weight, the amount of crosslinking agent is 0.3-0.5 parts by weight, and the amount of co-crosslinking agent is 2-3 parts by weight.

[0025] Specific examples of the amount of EPDM rubber used include: 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, 50 parts by weight, 51 parts by weight, 52 parts by weight, 53 parts by weight, 54 parts by weight, and 5... 5 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 parts by weight, 74 parts by weight, 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight, 79 parts by weight, 80 parts by weight, etc., and any range formed by any two of the above values.

[0026] Specific examples of the amount of polypropylene used include: 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, 50 parts by weight, and any range formed by any two of the above values.

[0027] The specific amounts of the crosslinking agent used can be 0.1 parts by weight, 0.2 parts by weight, 0.3 parts by weight, 0.35 parts by weight, 0.4 parts by weight, 0.45 parts by weight, 0.5 parts by weight, 0.55 parts by weight, 0.6 parts by weight, 0.65 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, etc., as well as any range of any two of the above values.

[0028] The specific amounts of the co-crosslinking agent can be 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, 1 part by weight, 1.1 parts by weight, 1.2 parts by weight, 1.3 parts by weight, 1.4 parts by weight, 1.5 parts by weight, 1.6 parts by weight, 1.7 parts by weight, 1.8 parts by weight, 1.9 parts by weight, 2 parts by weight, 2.1 parts by weight, 2.2 parts by weight, 2.3 parts by weight, 2.4 parts by weight, 2.5 parts by weight, 2.6 parts by weight, 2.7 parts by weight, 2.8 parts by weight, 2.9 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, etc., as well as any range formed by any two of the above values.

[0029] In this invention, preferably, the ethylene structural unit content is 50-70% by weight based on the total weight of the EPDM rubber; more preferably, the ethylene structural unit content is 55-65% by weight based on the total weight of the EPDM rubber.

[0030] In this invention, preferably, the content of the 5-vinyl-2-norbornene structural unit in the EPDM rubber is 0.5-4.5% by weight, based on the total weight of the EPDM rubber; more preferably, the content of the 5-vinyl-2-norbornene structural unit in the EPDM rubber is 1-3% by weight, based on the total weight of the EPDM rubber; even more preferably, the content of the 5-vinyl-2-norbornene structural unit in the EPDM rubber is 1.5-3% by weight, based on the total weight of the EPDM rubber.

[0031] Specific examples of the content of the 5-vinyl-2-norbornene structural unit of the EPDM rubber, based on the total weight of the EPDM rubber, include, for example, 1 wt%, 1.2 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, etc., as well as any range of any two of the above values.

[0032] In a preferred embodiment of the present invention, the diene monomer of the EPDM rubber is 5-vinyl-2-norbornene.

[0033] In this invention, preferably, the sum of the contents of ethylene structural units, propylene structural units, and the third monomer structural unit in the EPDM rubber is 100% by weight.

[0034] The weight-average molecular weight of the EPDM rubber can be 100,000 to 1,000,000, preferably 300,000 to 900,000.

[0035] In this invention, the polypropylene is homopolymer polypropylene and / or random copolymer polypropylene, and the melt index of the polypropylene at 230°C and under a load of 2.16 kg is 1-30 g / 10 min. To further improve the mechanical properties of the vulcanized rubber, preferably, the comonomer of the random copolymer polypropylene is ethylene.

[0036] According to the present invention, preferably, the crosslinking agent is selected from one or more of dicumyl peroxide, benzoyl peroxide, diisopropylphenyl peroxide, di-tert-butyl peroxide and tert-butyl peroxybenzoate, more preferably di(2-tert-butylperoxyisopropyl)benzene (BIPB).

[0037] According to the present invention, preferably, the crosslinking agent is selected from crosslinking agents with ethylene propylene rubber as a carrier, and more preferably dicumyl peroxide with ethylene propylene rubber as a carrier and / or benzoyl peroxide with ethylene propylene rubber as a carrier.

[0038] According to the present invention, the co-crosslinking agent is used as a co-crosslinking agent for the crosslinking agent, preferably, the co-crosslinking agent is selected from triallyl cyanurate (TAC) and / or triallyl cyanurate (TAIC).

[0039] According to the present invention, for the purpose of plasticization, preferably, the thermoplastic elastomer composition further contains a softener selected from one or more paraffinic rubber oils; more preferably, the softener is selected from paraffinic rubber oils, for example, an environmentally friendly paraffinic colorless rubber oil can be used.

[0040] According to the present invention, the amount of the softener can vary within a wide range. Preferably, the amount of the softener is 10-50 parts by weight; more preferably, the amount of the softener is 25-30 parts by weight.

[0041] According to the present invention, for the purpose of improving antioxidant properties, the thermoplastic elastomer composition preferably further contains an antioxidant, which is preferably selected from one or more of antioxidant RD, antioxidant MB and antioxidant 1010.

[0042] According to the present invention, preferably, the amount of antioxidant used is 0.1-2 parts by weight, more preferably, the amount of antioxidant used is 0.5-1.5 parts by weight.

[0043] According to the present invention, preferably, the thermoplastic elastomer composition further comprises a crosslinking aid, which can be a variety of aids commonly used in the art, such as zinc oxide.

[0044] According to the present invention, preferably, the amount of the crosslinking aid is 0.5-2 parts by weight; more preferably, the amount of the crosslinking aid is 1-1.5 parts by weight.

[0045] The EPDM / polypropylene thermoplastic elastomer composition of the present invention comprises EPDM rubber with a specific structure, and together with other components in the composition, the obtained thermoplastic elastomer composition can reduce the amount of crosslinking agent used during dynamic vulcanization, thereby reducing costs and improving the crosslinking efficiency of the vulcanization reaction, thereby reducing the odor of the product and improving the overall performance of the thermoplastic elastomer obtained by dynamic vulcanization of the composition (especially excellent mechanical properties, heat aging properties and compression set properties).

[0046] According to a second aspect of the present invention, a method for preparing an ethylene propylene diene monomer (EPDM) / polypropylene thermoplastic elastomer is provided, wherein the EPDM / polypropylene thermoplastic elastomer is prepared using the EPDM / polypropylene thermoplastic elastomer composition described in the first aspect of the present invention.

[0047] Preferably, the method includes: premixing the EPDM / polypropylene thermoplastic elastomer composition and then vulcanizing and extruding it in a twin-screw extruder.

[0048] According to the present invention, preferably, the conditions for the vulcanization extrusion include: a temperature of 150-250°C, a rotation speed of 200-1000 rpm, and a time of 0.5-2 min.

[0049] In this invention, the EPDM / polypropylene thermoplastic elastomer obtained by vulcanization extrusion using a twin-screw extruder can be pelletized and dried using an underwater pelletizer.

[0050] According to a third aspect of the present invention, a EPDM / polypropylene thermoplastic elastomer is provided, wherein the EPDM / polypropylene thermoplastic elastomer is prepared by the preparation method of the EPDM / polypropylene thermoplastic elastomer described in the second aspect of the present invention.

[0051] According to a fourth aspect of the present invention, the application of the EPDM / polypropylene thermoplastic elastomer composition of the first aspect of the present invention or the EPDM / polypropylene thermoplastic elastomer of the second aspect of the present invention in at least one of automotive parts, building materials, wires and cables, and household appliances is provided.

[0052] The present invention will be described in detail below through embodiments, but the present invention is not limited to the following embodiments.

[0053] The source of the goods in the following examples:

[0054] EPDM-A1: PX052, with a diene monomer VNB content of 1.5 wt% and an ethylene structural unit content of 59 wt%, purchased from Mitsui Chemicals, Japan;

[0055] EPDM-A2: Keltan DE 8270C, with a diene monomer VNB content of 3 wt% and an ethylene structural unit content of 52 wt%, purchased from Arlanxyn.

[0056] EPDM-A3: PX046, with a diene monomer VNB content of 4.5 wt% and an ethylene structural unit content of 57 wt%, purchased from Mitsui Chemicals, Japan;

[0057] EPDM-D1: 3092EPM, diene monomer ENB, with a third monomer structural unit content of 5.4 wt% and an ethylene structural unit content of 64 wt% based on the total weight of EPDM, purchased from Shanghai Gaoqiao.

[0058] EPDM-D2: Keltan 8550C, with a diene monomer ENB content of 5.5 wt% and an ethylene structural unit content of 55 wt%, purchased from Arlanxyn.

[0059] PP: F401, purchased from Yangzi Petrochemical;

[0060] Paraffin-based rubber oil: Environmentally friendly paraffin-based colorless rubber oil, purchased from Wuxi Yongzhen Industrial Oil Co., Ltd.

[0061] Crosslinking agent: Perkadoc 14-40, odorless BIPB with ethylene propylene rubber as carrier, effective amount of DCP is 40wt%, purchased from Arkema;

[0062] Antioxidant: MB, purchased from Shanghai Chengjin Chemical Co., Ltd.;

[0063] Co-crosslinking agent: Triallyl cyanurate (TAC), purchased from Arkema;

[0064] Crosslinking aid: Zinc oxide, commercially available.

[0065] In this invention, the performance of the prepared thermoplastic elastomer material is tested as follows:

[0066] Tensile properties of thermoplastic elastomer materials: At room temperature, the test was conducted according to the national standard GB / T 1040-2006. The tensile testing machine model was Shenzhen Xin Sansi Material Testing Co., Ltd., model 4104, and the tensile rate was 100 mm / min.

[0067] Aging test of thermoplastic elastomer materials at 125℃: Tested according to standard JBT 10436, temperature: 158℃±1℃, time: 168h;

[0068] Hardness test of thermoplastic elastomer materials: At room temperature, the test was conducted according to the national standard GB / T 528-1998. Shore hardness tester A: Beijing Times Peak Technology Co., Ltd., model TH200.

[0069] Compression set (%) of thermoplastic elastomer materials: measured using a rubber compression setter from Yangzhou Changzhe Testing Machinery Co., Ltd.

[0070] Examples 1-9

[0071] EPDM (EPDM-A1 for Examples 1, 3, 5, 7, and 8; EPDM-A2 for Examples 2, 4, and 6; and EPDM-A3 for Example 9) was mixed uniformly with other components forming the thermoplastic elastomer material (as shown in Table 1, where the amount of each raw material is in parts by weight) in a high-speed mixer at 1500 rpm for 15 min. Then, dynamic vulcanization was carried out in a twin-screw extruder at 200°C and 300 rpm for 1.5 min. Finally, the mixture was pelletized by an underwater pelletizer and dried. The pellets were then packaged into finished products to obtain the EPDM / PP thermoplastic elastomer materials of the present invention as described in Examples 1-9.

[0072] Comparative Examples 1-2

[0073] Comparative Examples 1 and 2 were prepared using a method similar to that of Example 1. The difference is that the EPDM rubber in Comparative Example 1 was EPDM-D1, and the EPDM rubber in Comparative Example 2 was EPDM-D2. See Table 1 for details.

[0074] Table 1

[0075] S1 S2 S3 S4 S5 S6 S7 S8 S9 D1 D2 EPDM 50 50 45 45 40 40 50 50 50 50 50 Paraffin-based rubber oil 30 30 30 30 25 25 30 30 30 30 30 PP 20 20 20 20 20 20 15 25 20 20 20 Crosslinking agent 0.48 0.48 0.42 0.42 0.38 0.38 0.48 0.48 0.48 1.1 1.2 antioxidants 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Co-crosslinking agent 2.8 2.8 2.5 2.5 2.3 2.3 2.8 2.8 2.8 6.5 7.0 ZnO 1.3 1.3 1.2 1.2 1.1 1.1 1.3 1.3 1.3 3 3

[0076] Test Example 1

[0077] The EPDM / PP thermoplastic elastomers obtained in Examples 1-9 and Comparative Examples 1-2 were placed in a vacuum oven and dried at 90°C for 4 hours. Standard specimens were then made using an injection molding machine (temperature 215°C) and their tensile properties and hardness were tested. The results are shown in Table 2.

[0078] Table 2

[0079]

[0080] As shown in Table 2, the EPDM / PP thermoplastic elastomer of the present invention exhibits superior mechanical properties compared to the conventional EPDM using ENB as the third monomer, under conditions of lower crosslinking agent and co-crosslinking agent dosages. In particular, its heat aging performance and high-temperature compression set performance are better, resulting in superior overall performance.

[0081] 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 EPDM / polypropylene thermoplastic elastomer composition, characterized in that, The thermoplastic elastomer composition comprises ethylene propylene diene monomer (EPDM) rubber, polypropylene, a crosslinking agent, and a co-crosslinking agent; The amount of EPDM rubber is 30-80 parts by weight, the amount of polypropylene is 10-50 parts by weight, the amount of crosslinking agent is 0.1-1 parts by weight, the amount of co-crosslinking agent is 0.5-6 parts by weight, and the diene monomer of EPDM rubber contains 5-vinyl-2-norbornene.

2. The thermoplastic elastomer composition according to claim 1, wherein, The amount of EPDM rubber is 40-50 parts by weight, the amount of polypropylene is 15-30 parts by weight, the amount of crosslinking agent is 0.3-0.5 parts by weight, and the amount of co-crosslinking agent is 2-3 parts by weight.

3. The thermoplastic elastomer composition according to claim 1, wherein, The weight-average molecular weight of the EPDM rubber is 100,000 to 1,000,000, preferably 300,000 to 900,000. Preferably, based on the total weight of the EPDM rubber, the content of the ethylene structural unit is 50-70% by weight, preferably 55-65% by weight; the content of the 5-vinyl-2-norbornene structural unit is 0.5-4.5% by weight, preferably 1.5-3% by weight. Preferably, the diene monomer of the EPDM rubber is 5-vinyl-2-norbornene.

4. The thermoplastic elastomer composition according to any one of claims 1-3, wherein, The crosslinking agent is selected from one or more of dicumyl peroxide, benzoyl peroxide, diisopropylphenyl peroxide, di-tert-butyl peroxide, and tert-butyl peroxybenzoate, preferably di(2-tert-butylperoxyisopropyl)benzene; or The crosslinking agent is selected from crosslinking agents with ethylene propylene rubber as a carrier, preferably dicumyl peroxide with ethylene propylene rubber as a carrier and / or di(2-tert-butylperoxyisopropyl)benzene with ethylene propylene rubber as a carrier.

5. The thermoplastic elastomer composition according to any one of claims 1-3, wherein, The co-crosslinking agent is selected from triallyl cyanurate and / or triallyl isocyanurate.

6. The thermoplastic elastomer composition according to any one of claims 1-3, wherein, The thermoplastic elastomer composition further contains a softener selected from one or more paraffinic rubber oils.

7. The thermoplastic elastomer composition according to claim 6, wherein, The amount of the softener is 10-50 parts by weight, preferably 25-30 parts by weight.

8. The thermoplastic elastomer composition according to any one of claims 1-3, wherein, The thermoplastic elastomer composition further contains an antioxidant selected from one or more of antioxidants RD, MB, and 1010.

9. The thermoplastic elastomer composition according to claim 8, wherein, The antioxidant is used in an amount of 0.1-2 parts by weight, preferably 0.5-1.5 parts by weight.

10. A method for preparing a EPDM / polypropylene thermoplastic elastomer, characterized in that, The EPDM / polypropylene thermoplastic elastomer is prepared using the EPDM / polypropylene thermoplastic elastomer composition according to any one of claims 1-9.

11. The method according to claim 10, wherein, The method includes: premixing the EPDM / polypropylene thermoplastic elastomer composition and then vulcanizing and extruding it in a twin-screw extruder.

12. The method according to claim 11, wherein, The conditions for vulcanization extrusion include: a temperature of 150-250℃, a rotation speed of 200-1000 rpm, and a time of 0.5-2 min.

13. A ternary ethylene propylene diene monomer (EPDM) / polypropylene thermoplastic elastomer, characterized in that, The ternary B1230588 I90272BHY The propylene rubber / polypropylene thermoplastic elastomer is prepared by the method for preparing ethylene propylene rubber / polypropylene thermoplastic elastomer according to any one of claims 10-12.

14. The use of the EPDM / polypropylene thermoplastic elastomer composition according to any one of claims 1-9 or the EPDM / polypropylene thermoplastic elastomer according to claim 13 in at least one of automotive parts, building materials, wires and cables, and household appliances.

Images