Preparation method of halogenated EPDM / PP rubber-plastic blend material, dynamically vulcanized thermoplastic elastomer and its preparation method and application

Abstract

The invention relates to the field of thermoplastic elastomer materials, and discloses a preparation method of a halogenated EPDM / PP rubber-plastic blend material, a dynamically vulcanized thermoplastic elastomer, and a preparation method and application thereof. The preparation method of the halogenated EPDM / PP rubber-plastic blend material of the invention comprises: while blending EPDM and PP into rubber and plastic, halogenating EPDM. The invention utilizes an initiator to graft halogen onto the EPDM main chain, and improves the elongation at break and tensile strength of the EPDM / PPTPV material without affecting the vulcanization speed and density of EPDM, so as to prepare a dynamically vulcanized thermoplastic elastomer with a smooth surface and excellent processing performance.

Description

Technical Field

[0001] The present invention relates to the field of thermoplastic elastomer materials, and in particular to a method for preparing a halogenated EPDM / PP rubber-plastic blend material, a dynamically vulcanized thermoplastic elastomer, and a preparation method and application thereof. Background Art

[0002] EPDM / PP thermoplastic elastomer materials are the first type of thermoplastic elastomer to enter the market. They have good physical properties and can be processed using thermoplastic plastic processing equipment and processes. They are widely used in household appliances, wires and cables, construction, automobiles and other industries. As the scope of application continues to expand, EPDM / PP TPV, as the "third generation rubber", has gradually replaced traditional rubber. However, due to its poor compatibility among various phases and complex preparation process, the mechanical properties and processing properties of TPV products are affected, thus limiting its scope of application.

[0003] Literature (Jiang Wanlan et al., Properties of New Chlorinated EPDM Rubber and Its Vulcanizates; World Rubber Industry, 2001, Vol. 28, No. 2: pp. 15-16) uses dichlorocarbonyl to react with double bonds of EPDM rubber to obtain modified EPDM rubber, which improves its adhesion and co-vulcanization properties with highly unsaturated rubbers. However, due to the reduction of double bonds in the modified rubber, the vulcanization rate and vulcanization network density of EPDM rubber are reduced, and its tensile strength is low and its tensile permanent deformation is high.

[0004] CN101597378A discloses a method for preparing a thermoplastic dynamically vulcanized rubber, and the specific operation steps are as follows: (1) EPDM rubber, polypropylene, talcum powder, and antioxidant 1010 are uniformly mixed in a high-speed mixer, melt-blended at 180°C through a twin-screw extruder, and a naphthenic oil softener is added through a liquid filling port; (2) the product of (1), tert-octylphenolic resin vulcanizer, and stannous chloride are uniformly mixed in a high-speed mixer, and dynamically vulcanized at 180°C through a twin-screw extruder, and a naphthenic oil softener is added; (3) the product of (2) and black masterbatch are uniformly mixed in a high-speed mixer, and melt-extruded at 180°C through a twin-screw extruder, and a naphthenic oil softener is added. The dynamically vulcanized thermoplastic elastomer material prepared by this preparation method has low elongation at break, rough surface, and poor processing performance. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of low tensile strength and elongation at break, rough surface and poor processing performance of the TPV material produced due to the difficulty in dispersing the halogen donor stannous chloride and poor temperature resistance in the existing EPDM / PP dynamic vulcanization technology, and to provide a preparation method of a halogenated EPDM / PP rubber-plastic blend material, a dynamically vulcanized thermoplastic elastomer and its preparation method and application. The present invention uses an initiator to graft halogens onto the EPDM main chain, and improves the elongation at break and tensile strength of the EPDM / PP TPV material without affecting the EPDM vulcanization speed and density, and prepares a dynamically vulcanized thermoplastic elastomer with a smooth surface and excellent processing performance.

[0006] In order to achieve the above object, the present invention provides a method for preparing a halogenated EPDM / PP rubber-plastic blend material, wherein the method comprises: while blending EPDM and PP into rubber-plastic, performing a halogenation reaction on EPDM.

[0007] Preferably, EPDM and PP are rubber-plastic blended in the presence of halogen gas and an initiator.

[0008] Preferably, EPDM, PP, antioxidant, filler oil and initiator are rubber-plastic blended in the presence of halogen gas.

[0009] Preferably, EPDM, PP, antioxidant, filler oil and initiator are added into an extruder for rubber and plastic blending to obtain rubber and plastic masterbatch, and halogen gas is introduced into the twin-screw extruder during the preparation process.

[0010] Preferably, the initiator is a peroxide initiator.

[0011] Preferably, the initiator is one or more of benzoyl peroxide, diisopropylbenzene peroxide, di-tert-butyl peroxide isopropylbenzene and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, preferably di-tert-butyl peroxide isopropylbenzene.

[0012] Preferably, the filler oil is naphthenic oil and / or paraffin oil.

[0013] Preferably, the amount of the initiator is 0.02-0.2 parts by weight, preferably 0.05-0.1 parts by weight, relative to 100 parts by weight of the EPDM.

[0014] Preferably, the halogen gas is chlorine gas or bromine vapor, preferably chlorine gas.

[0015] Preferably, the amount of the halogen gas used is such that the halogen content in the halogenated EPDM is 0.5-3% by weight, preferably 1-2% by weight.

[0016] Preferably, the antioxidant is one or more of an amine antioxidant, a quinoline antioxidant and a benzimidazole antioxidant.

[0017] Preferably, relative to 100 parts by weight of the EPDM, the amount of the antioxidant is 0.2-2 parts by weight, preferably 0.4-0.8 parts by weight, and more preferably 0.5-0.6 parts by weight.

[0018] Preferably, relative to 100 parts by weight of the EPDM, the amount of the PP is 30-90 parts by weight, preferably 40-80 parts by weight.

[0019] Preferably, the amount of the extender oil is 10-80 parts by weight, more preferably 20-60 parts by weight, relative to 100 parts by weight of the EPDM.

[0020] Preferably, the conditions for blending the rubber and plastic include: a temperature of 170-200° C. and a time of 1.5-2.5 min.

[0021] According to a second aspect of the present invention, a method for preparing a dynamically vulcanized thermoplastic elastomer is provided, wherein the method comprises the step of dynamically vulcanizing the halogenated EPDM / PP rubber-plastic blend material prepared by the method for preparing the halogenated EPDM / PP rubber-plastic blend material described in the present invention.

[0022] Preferably, the thermoplastic elastomer is obtained by dynamically vulcanizing the masterbatch of the halogenated EPDM / PP rubber-plastic blend material and the vulcanizing agent masterbatch.

[0023] Preferably, the vulcanizing agent masterbatch is obtained by kneading the vulcanizing agent and EPDM and then extruding and granulating the mixture.

[0024] According to a third aspect of the present invention, there is provided a dynamically vulcanized thermoplastic elastomer prepared according to the second aspect of the present invention.

[0025] According to a fourth aspect of the present invention, a method for preparing a halogenated EPDM / PP rubber-plastic blend of the present invention is provided, and the halogenated EPDM / PP rubber-plastic blend is used in preparing a dynamically vulcanized thermoplastic elastomer.

[0026] Through the above technical scheme, the present invention uses an initiator to graft halogens onto the EPDM main chain, thereby improving the elongation at break and tensile strength of the EPDM / PP TPV material without affecting the EPDM vulcanization speed and density, and preparing a dynamically vulcanized thermoplastic elastomer with a smooth surface and excellent processing performance. DETAILED DESCRIPTION

[0027] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0028] According to a first aspect of the present invention, a method for preparing a halogenated EPDM / PP rubber-plastic blend is provided, wherein the method comprises: while blending EPDM and PP into rubber-plastic, performing a halogenation reaction on EPDM.

[0029] In the present invention, halogen is grafted onto the EPDM main chain by using an initiator, and the elongation at break and tensile strength of the EPDM / PP TPV material are improved without affecting the EPDM vulcanization speed and density, so as to prepare a dynamically vulcanized thermoplastic elastomer with a smooth surface and excellent processing performance.

[0030] According to the present invention, the EPDM may be various EPDM rubbers commonly used in the art, for example, based on the total weight of the EPDM rubber, the content of ethylene structural units in the EPDM rubber is 50-70% by weight, and the content of the third monomer is 4-6% by weight; the weight average molecular weight of the EPDM rubber is 100,000-400,000; the third monomer may be various third monomers commonly used in the art, for example, it may be one or more of 1,4-hexadiene, dicyclopentadiene (DCPD) and 5-ethylidene-2-norbornene, preferably 5-ethylidene-2-norbornene (ENB)

[0031] According to the present invention, the PP is homopolymer polypropylene and / or random copolymer polypropylene, and the melt index of the polypropylene at 230° C. and 2.16 kg load is 1-20 g / 10 min. In order to further improve the mechanical properties of the vulcanized rubber, preferably, the comonomer of the random copolymer polypropylene is ethylene.

[0032] According to the present invention, preferably, EPDM and PP are blended into a rubber-plastic mixture in the presence of a halogen gas and an initiator. By blending EPDM and PP into a rubber-plastic mixture in the presence of a halogen gas and an initiator, the halogen can be grafted onto the EPDM main chain by the initiator, thereby improving the elongation at break and the tensile strength of the EPDM / PP TPV material without affecting the EPDM vulcanization speed and density, and preparing a dynamically vulcanized thermoplastic elastomer with a smooth surface and excellent processing performance.

[0033] More preferably, in the presence of halogen gas, EPDM, PP, antioxidant, filler oil and initiator are blended with rubber and plastic; more preferably, EPDM, PP, antioxidant, filler oil and initiator are added to an extruder for rubber and plastic blending to obtain rubber and plastic masterbatch, and halogen gas is introduced into the twin-screw extruder during the preparation process; further preferably, EPDM, PP, antioxidant, filler oil and initiator are added to an extruder for rubber and plastic blending to obtain rubber and plastic masterbatch, and halogen gas is continuously introduced into the twin-screw extruder during the preparation process.

[0034] In a preferred embodiment of the present invention, EPDM, PP, antioxidant, filler oil and initiator are added into an extruder for rubber-plastic blending to obtain rubber-plastic masterbatch, and halogen gas is continuously introduced into the twin-screw extruder under nitrogen protection during the preparation process.

[0035] According to the present invention, the initiator can achieve the purpose of grafting halogen onto the EPDM main chain. Preferably, the initiator is a peroxide initiator; more preferably, the initiator is one or more of benzoyl peroxide, diisopropylbenzene peroxide, di-tert-butyl peroxide isopropylbenzene and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane; particularly preferably, the initiator is di-tert-butyl peroxide isopropylbenzene.

[0036] According to the present invention, the amount of the initiator can be selected according to the amount of the EPDM. Preferably, the amount of the initiator is 0.02-0.2 parts by weight relative to 100 parts by weight of the EPDM; more preferably, the amount of the initiator is 0.05-0.1 parts by weight relative to 100 parts by weight of the EPDM.

[0037] According to the present invention, preferably, the halogen gas is chlorine gas or bromine vapor, more preferably chlorine gas.

[0038] In addition, it is preferred that the amount of the halogen gas used is such that the halogen content in the halogenated EPDM is 0.5-3 wt %; more preferably, the amount of the halogen gas used is such that the halogen content in the halogenated EPDM is 1-2 wt %.

[0039] According to the present invention, the antioxidant may be one or more of an amine antioxidant, a quinoline antioxidant and a benzimidazole antioxidant. Specifically, the amine antioxidant is a naphthylamine antioxidant and / or a p-phenylenediamine antioxidant. More specifically, the naphthylamine antioxidant is naphthylamine and its derivatives; the p-phenylenediamine antioxidant is p-phenylenediamine and its derivatives; the quinoline antioxidant is quinoline and its derivatives, such as 2,2,4-trimethyl-1,2-dihydroquinoline; the benzimidazole antioxidant is benzimidazole and its derivatives, such as 2-mercaptobenzimidazole. Further preferably, the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (antioxidant 1010).

[0040] According to the present invention, the amount of the antioxidant can be selected according to the amount of the EPDM. Preferably, the amount of the antioxidant is 0.2-2 parts by weight relative to 100 parts by weight of the EPDM; more preferably, the amount of the antioxidant is 0.4-0.8 parts by weight relative to 100 parts by weight of the EPDM; further preferably, the amount of the antioxidant is 0.5-0.6 parts by weight relative to 100 parts by weight of the EPDM.

[0041] According to the present invention, the amount of the PP can be selected according to the amount of the EPDM. Preferably, the amount of the PP is 30-90 parts by weight relative to 100 parts by weight of the EPDM; more preferably, the amount of the PP is 40-80 parts by weight relative to 100 parts by weight of the EPDM.

[0042] According to the present invention, preferably, the filler oil is cyclohexane oil and / or paraffin oil; more preferably, the filler oil is environmentally friendly paraffin oil.

[0043] According to the present invention, the amount of the filler oil can be selected according to the amount of the EPDM. Preferably, the amount of the filler oil is 10-80 parts by weight relative to 100 parts by weight of the EPDM; further preferably, the amount of the filler oil is 20-60 parts by weight relative to 100 parts by weight of the EPDM.

[0044] According to the present invention, preferably, the conditions for blending the rubber and plastic include: a temperature of 170-200° C. and a time of 1.5-2.5 min.

[0045] The rubber-plastic blending can be carried out in various equipment commonly used in the art, such as a twin-screw extruder. When carried out in a twin-screw extruder, the rubber-plastic blending conditions include: temperature of 170-200°C, time of 1.5-2.5 min, and screw speed of 150-400 rpm.

[0046] According to a second aspect of the present invention, a method for preparing a dynamically vulcanized thermoplastic elastomer is provided, wherein the method comprises the step of dynamically vulcanizing the halogenated EPDM / PP rubber-plastic blend material prepared by the method for preparing the halogenated EPDM / PP rubber-plastic blend material described in the present invention.

[0047] According to the present invention, preferably, the masterbatch of the halogenated EPDM / PP rubber-plastic blend material and the masterbatch of the vulcanizing agent are dynamically vulcanized to obtain the thermoplastic elastomer.

[0048] According to the present invention, preferably, the vulcanizing agent masterbatch is obtained by kneading the vulcanizing agent and EPDM and then extruding and granulating them; more preferably, the vulcanizing agent masterbatch is obtained by kneading the vulcanizing agent and EPDM in a weight ratio of 1:2-8 and then extruding and granulating them.

[0049] The above-mentioned internal mixing can be carried out in an internal mixer, and the internal mixing time can be, for example, 3-6 minutes.

[0050] The above-mentioned dynamic vulcanization can be carried out in the equipment commonly used for dynamic vulcanization in the art, for example, it can be carried out in a twin-screw extruder. In addition, the conditions of dynamic vulcanization can be carried out according to the conventional conditions in the art.

[0051] According to the present invention, preferably, the vulcanizing agent is one or more of tert-butylphenol formaldehyde resin, tert-octylphenol formaldehyde resin and epoxy resin; more preferably, the vulcanizing agent is tert-octylphenol formaldehyde resin.

[0052] According to the present invention, the amount of the vulcanizing agent can be selected according to the amount of the EPDM. Preferably, the amount of the vulcanizing agent is 3-10 parts by weight relative to 100 parts by weight of the EPDM; more preferably, the amount of the vulcanizing agent is 6-8 parts by weight relative to 100 parts by weight of the EPDM.

[0053] In a particularly preferred embodiment of the present invention, the thermoplastic elastomer is prepared according to the following method:

[0054] 1) Add EPDM, PP, antioxidant, filler oil, initiator and chlorine into a twin-screw extruder to mix rubber and plastic to obtain halogenated EPDM / PP rubber and plastic masterbatch;

[0055] 2) Mix the vulcanizing agent and EPDM in an internal mixer, add them into a single screw granulator for extrusion granulation to obtain a vulcanizing agent masterbatch, the internal mixing temperature is 90°C, and the single screw granulation temperature is 70°C;

[0056] 3) After mixing the halogenated EPDM / PP rubber and plastic masterbatch and the vulcanizing agent masterbatch, add them into the first main feed port of the twin-screw extruder for dynamic vulcanization.

[0057] The dynamic vulcanization conditions include: twin-screw extruder ￠=35mm L / D=56; dynamic vulcanization temperature 190°C; dynamic vulcanization time 2.5min; rotation speed 300rpm.

[0058] According to a third aspect of the present invention, there is provided a dynamically vulcanized thermoplastic elastomer prepared according to the second aspect of the present invention.

[0059] According to a fourth aspect of the present invention, a method for preparing a halogenated EPDM / PP rubber-plastic blend of the present invention is provided, and the halogenated EPDM / PP rubber-plastic blend is used in preparing a dynamically vulcanized thermoplastic elastomer.

[0060] The preparation method of the halogenated EPDM / PP rubber-plastic blend material provided by the present invention and its application in dynamically vulcanized thermoplastic elastomers, utilize peroxide initiators to graft halogens onto the EPDM main chain, improve the elongation at break and tensile strength of the EPDM / PP TPV material without affecting the EPDM vulcanization speed and density, and prepare a dynamically vulcanized thermoplastic elastomer material with a smooth surface and excellent processing performance, thereby greatly broadening the application scope of the flame-retardant EPDM / PPTPV material, and can be widely used in household appliances, wires and cables, construction, automobiles and other industries.

[0061] The present invention will be described in detail below by way of examples, but the present invention is not limited to the following examples.

[0062] Examples 1-7 and Comparative Examples 1-3

[0063] Examples 1-7 Dynamically vulcanized thermoplastic elastomers were prepared according to the following preparation method and the amounts shown in Table 1, wherein the preparation method is:

[0064] (1) EPDM (3092EPM, Mitsui Chemicals), PP (K4912, Yanshan Petrochemical), antioxidant (1010, commercially available), environmentally friendly paraffin oil (Yongzhen Oil), initiator (BIBP, commercially available), and chlorine (commercially available) were added into a twin-screw extruder (purchased from Nanjing Coperion, model STS35) in proportion for rubber and plastic blending (temperature 180°C, time 2 min, screw speed 200 rpm) to obtain halogenated EPDM / PP rubber and plastic masterbatch (chlorine content is shown in Table 1).

[0065] (2) The vulcanizing agent (tert-octylphenol formaldehyde resin, commercially available) and EPDM were mixed in a mixer at a ratio of 1:6 for 5 min, and then added to a single-screw granulator for extrusion granulation to obtain a vulcanizing agent masterbatch. The mixing temperature was 90°C and the single-screw granulation temperature was 70°C.

[0066] (3) The halogenated EPDM / PP rubber and plastic masterbatch and the vulcanizing agent masterbatch calculated as the vulcanizing agent (the amount thereof is shown in the “vulcanizing agent” amount in Table 1) are mixed uniformly in a high-speed mixing device in proportion, and added into the main feed port of the first stage of the twin-screw extruder for dynamic vulcanization.

[0067] (4) Dynamic vulcanization process conditions are: twin-screw extruder ￠ = 35 mm L / D = 56; dynamic vulcanization temperature 190°C; dynamic vulcanization time 2.5 min; rotation speed 300 rpm.

[0068] In addition, comparative examples 1-3 were set up. Comparative examples 1-3 were also used to prepare dynamically vulcanized thermoplastic elastomers according to the above preparation method and the amounts shown in Table 1. The difference was that in step 1) of comparative example 1-2, no initiator and chlorine were added, and in step 1) of comparative example 3, no initiator and chlorine were added, and the vulcanizing agent used in the vulcanization was stannous chloride.

[0069] Table 1

[0070]

[0071] Test Examples 1-7 and Comparative Examples 1-3

[0072] The tensile strength and elongation at break were tested according to ASTM D412, with a tensile rate of 500 mm / min.

[0073] Table 2

[0074]

[0075] From Table 1 and Table 2, it can be seen that the embodiment uses a peroxide initiator to graft halogen onto the EPDM main chain, thereby improving the elongation at break and tensile strength of the EPDM / PP TPV material without affecting the EPDM vulcanization speed and density, and preparing a dynamically vulcanized thermoplastic elastomer material with a smooth surface and excellent processing performance, thereby greatly broadening the application scope of the EPDM / PP TPV material, which can be widely used in household appliances, wires and cables, construction, automobiles and other industries.

[0076] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for preparing a halogenated EPDM / PP rubber-plastic blend material, characterized in that: The method comprises: in the presence of halogen gas and initiator, EPDM and PP are blended together and halogenated at the same time. Wherein, relative to 100 parts by weight of the EPDM, the amount of the initiator is 0.02-0.2 parts by weight, and the amount of the PP is 30-90 parts by weight; The amount of the halogen gas used is such that the halogen content in the halogenated EPDM is 0.5-3% by weight.

2. The method according to claim 1, wherein: In the presence of halogen gas, EPDM, PP, antioxidant, filler oil and initiator are blended into rubber and plastic.

3. The method according to claim 2, wherein: EPDM, PP, antioxidant, filler oil and initiator are added into an extruder for rubber and plastic blending to obtain rubber and plastic masterbatch. During the preparation process, halogen gas is introduced into the twin-screw extruder.

4. The method according to claim 2, wherein: The initiator is a peroxide initiator.

5. The method according to claim 4, wherein: The initiator is one or more of benzoyl peroxide, dicumyl peroxide, di-tert-butylcumyl peroxide and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

6. The method according to claim 5, wherein: The initiator is di-tert-butyl cumene peroxide.

7. The method according to claim 1, wherein: The amount of the initiator is 0.05-0.1 parts by weight relative to 100 parts by weight of the EPDM.

8. The method according to claim 2, wherein: The halogen gas is chlorine gas or bromine vapor.

9. The method according to claim 8, wherein: The halogen gas is chlorine.

10. The method according to claim 1, wherein: The amount of the halogen gas used is such that the halogen content in the halogenated EPDM is 1-2% by weight.

11. The method according to any one of claims 2 to 10, wherein: The antioxidant is one or more of an amine antioxidant, a quinoline antioxidant and a benzimidazole antioxidant.

12. The method according to claim 2, wherein: The filler oil is naphthenic oil and / or paraffin oil.

13. The method according to claim 11, wherein: The amount of the antioxidant is 0.2-2 parts by weight relative to 100 parts by weight of the EPDM.

14. The method according to claim 13, wherein: The amount of the antioxidant is 0.4-0.8 parts by weight relative to 100 parts by weight of the EPDM.

15. The method according to claim 14, wherein: The amount of the antioxidant is 0.5-0.6 parts by weight relative to 100 parts by weight of the EPDM.

16. The method according to claim 1, wherein: The amount of the PP is 40-80 parts by weight relative to 100 parts by weight of the EPDM.

17. The method according to claim 2, wherein: The amount of the filler oil is 10-80 parts by weight relative to 100 parts by weight of the EPDM.

18. The method according to claim 17, wherein: The amount of the filler oil is 20-60 parts by weight relative to 100 parts by weight of the EPDM.

19. The method according to any one of claims 2 to 10, wherein: The conditions for the rubber and plastic blending include: a temperature of 170-200° C. and a time of 1.5-2.5 min.

20. A method for preparing a dynamically vulcanized thermoplastic elastomer, characterized in that: The method comprises the steps of: dynamically vulcanizing the halogenated EPDM / PP rubber-plastic blended material prepared by the preparation method of the halogenated EPDM / PP rubber-plastic blended material described in any one of claims 1 to 19.

21. The method according to claim 20, wherein: The thermoplastic elastomer is obtained by dynamically vulcanizing the masterbatch of the halogenated EPDM / PP rubber-plastic blend material and the masterbatch of the vulcanizing agent.

22. The method according to claim 21, wherein: The vulcanizing agent masterbatch is obtained by kneading the vulcanizing agent and EPDM and then extruding and granulating them.

23. A dynamically vulcanized thermoplastic elastomer prepared by the method for preparing a thermoplastic elastomer according to any one of claims 20 to 22.

24. Use of the halogenated EPDM / PP rubber-plastic blend prepared by the method for preparing the halogenated EPDM / PP rubber-plastic blend as claimed in any one of claims 1 to 19 in the preparation of dynamically vulcanized thermoplastic elastomers.

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