Raw material composition, foaming master batch, preparation method of foaming master batch, micro-foaming material composition, micro-foaming material, preparation method of micro-foaming material and application of micro-foaming material

Abstract

The invention relates to the field of foaming polymer materials, and discloses a foaming master batch raw material composition, a foaming master batch using the raw material composition, a preparation method of the foaming master batch, an EPDM / PP TPV micro-foaming material composition, an EPDM / PP TPV micro-foaming material, and a preparation method and application of the EPDM / PP TPV micro-foaming material. The raw material composition for the foaming master batch comprises a base material, extending oil, a first foaming agent, a second foaming agent, an auxiliary foaming agent and a surfactant, the first foaming agent is one or more of azodicarbonamide, 4, 4 '-oxybisbenzenesulfonyl hydrazide, trihydrazino-s-triazine and biurea, and the second foaming agent is an inorganic foaming agent. The EPDM / PP TPV micro-foaming material prepared by using the foaming master batch disclosed by the invention is lower in foaming agent consumption and higher in tensile strength and elongation at break under the same foaming ratio.

Description

Technical Field

[0001] This invention relates to the field of foamed polymer materials, specifically to a low-density foaming masterbatch raw material composition, a low-density foaming masterbatch using the raw material composition and its preparation method, as well as an EPDM / PP TPV microfoaming material composition, EPDM / PP TPV microfoaming material and its preparation method and application. Background Technology

[0002] Foamed polymer materials refer to a class of polymer materials formed by dispersing a large amount of gas within the material. They possess properties such as lightweight, heat insulation, sound absorption, and vibration damping. Microfoamed materials, while maintaining the necessary mechanical properties, can significantly reduce the weight of finished products, thereby reducing raw material consumption and production costs. Furthermore, the high pore density and small pore size of the cells endow microfoamed materials with many superior properties unmatched by unfoamed and traditional foamed materials, such as higher impact strength, toughness, and fatigue life. Currently, there is considerable research on microporous plastics and microporous rubber foaming. Dynamically vulcanized thermoplastic elastomers (TPVs) exhibit excellent performance and are suitable for applications in automotive lightweighting and rail transportation. However, research on TPV foaming is still limited.

[0003] The literature (Chen Wenquan et al., Preparation of Foamed EPDM / PP Thermoplastic Vulcanizate by Chemical Foaming Method; Synthetic Rubber Industry, 2008, No. 5: 385-389) used azodicarbonamide (AC) as a foaming agent and employed a single-screw extruder to foam Shandong Dawn 21-64A grade TPV. The effects of the dosage of foaming agent, co-foaming agent, and surfactant on the density, tensile properties, and cell size and distribution of the foamed TPV were investigated. The EPDM / PP TPV microfoamed material prepared using 0.5 phr of AC as a foaming agent with a foaming ratio of 1.3 showed a significant decrease in tensile strength and elongation at break, affecting the application of the TPV product.

[0004] CN102775652B discloses a thermoplastic elastomer microporous foamed material and its preparation method. The material comprises 70-95 parts by weight of thermoplastic elastomer and 5-30 parts by weight of foaming agent masterbatch. The foaming agent masterbatch is prepared by mixing 50-90 parts by weight of compatibilizer, 6-30 parts by weight of foaming agent, and 4-20 parts by weight of foaming aid in a two-roll mill. The foaming agent masterbatch is prepared by mixing 100 parts by weight of base rubber, 5-10 parts by weight of activator, 20-100 parts by weight of reinforcing filler, and 0-10 parts by weight of softener. 20 parts of vulcanizing agent, 0.5-5 parts of curing agent, and 1-10 parts of accelerator are added sequentially to an open mill or internal mixer and mixed evenly to prepare a compound. The compound is then shredded and mixed evenly with 10-70 parts of plastic in a high-speed mixer. The mixture is then extruded and granulated to prepare TPV granules. The foaming agent masterbatch and TPV granules are mixed evenly and then extruded again to obtain a microporous foamed material for vibration damping. This TPV foaming process is complex, the amount of foaming agent is high, and the prepared TPV microfoamed material has low tensile strength and elongation at break. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem of uneven distribution of foaming agent in TPV substrates in existing technologies, which leads to low tensile strength and elongation at break in the prepared micro-foamed TPV materials. This invention provides a low-density foaming masterbatch raw material composition, a low-density foaming masterbatch using this raw material composition, its preparation method, an EPDM / PP TPV micro-foamed material composition, an EPDM / PPTPV micro-foamed material, its preparation method, and its applications. By using the low-density foaming masterbatch of this invention, the prepared EPDM / PPTPV micro-foamed material achieves higher tensile strength and elongation at break at the same foaming ratio with a lower amount of foaming agent.

[0006] To achieve the above objectives, the present invention provides a raw material composition for foaming masterbatch, wherein the composition comprises a matrix material, a filler oil, a first foaming agent, a second foaming agent, a co-foaming agent, and a surfactant, wherein the first foaming agent is one or more of azodicarbonamide, 4,4'-oxobis(benzenesulfonylhydrazine), trihydrazine triazine, and biuret, and the second foaming agent is an inorganic foaming agent.

[0007] Preferably, relative to 100 parts by weight of the matrix material, the content of the filler oil is 15-65 parts by weight, the content of the first foaming agent is 15-35 parts by weight, the content of the second foaming agent is 2-25 parts by weight, the content of the co-foaming agent is 5-20 parts by weight, and the content of the surfactant is 5-35 parts by weight; more preferably, relative to 100 parts by weight of the matrix material, the content of the filler oil is 20-60 parts by weight, the content of the first foaming agent is 20-30 parts by weight, the content of the second foaming agent is 4-20 parts by weight, the content of the co-foaming agent is 10-15 parts by weight, and the content of the surfactant is 10-30 parts by weight.

[0008] Preferably, the matrix material is SEBS and / or POE, and more preferably SEBS elastomer.

[0009] Preferably, the second foaming agent is one or more of sodium bicarbonate, ammonium bicarbonate, and water; more preferably, the first foaming agent is azodicarbonamide, and the second foaming agent is sodium bicarbonate.

[0010] Preferably, the foaming agent is zinc stearate and / or magnesium stearate, with zinc stearate being the most preferred.

[0011] Preferably, the surfactant is stearic acid or zinc oxide, with stearic acid being more preferred.

[0012] Preferably, the filler oil is paraffin oil.

[0013] According to a second aspect of the present invention, a foaming masterbatch is provided, wherein it is obtained by mixing the foaming masterbatch described in the first aspect of the present invention with a raw material composition and then extruding, foaming, and granulating it.

[0014] According to a third aspect of the present invention, a method for preparing foaming masterbatch is provided, wherein the method includes the step of mixing the foaming masterbatch described in the first aspect of the present invention with a raw material composition and then performing extrusion foaming granulation.

[0015] Preferably, the matrix material, the filler oil, the first foaming agent, the second foaming agent, the foaming aid, and the surfactant are mixed and then fed into a twin-screw extruder for extrusion foaming and granulation.

[0016] Preferably, the extrusion temperature is 90-120℃ and the twin-screw speed is 150-300rpm.

[0017] According to a fourth aspect of the present invention, an EPDM / PP TPV microfoaming material composition is provided, wherein the microfoaming material comprises EPDM / PP TPV and a foaming masterbatch prepared by the preparation method of the foaming masterbatch described in the second aspect of the present invention or the foaming masterbatch described in the third aspect of the present invention, wherein the content of the foaming masterbatch is 2-8 parts by weight relative to 100 parts by weight of EPDM / PP TPV.

[0018] According to a fifth aspect of the present invention, a method for preparing an EPDM / PP TPV microfoam material is provided, wherein the microfoam material is obtained by extruding and granulating the EPDM / PP TPV microfoam material composition described in the fourth aspect.

[0019] Preferably, the micro-foamed material is obtained by mixing EPDM / PP TPV and the foaming masterbatch, and then feeding the mixture into a twin-screw extruder for extrusion granulation.

[0020] Preferably, the extrusion temperature is 180-220℃ and the twin-screw speed is 150-400rpm.

[0021] According to a sixth aspect of the present invention, an EPDM / PP TPV microfoam material is provided, which is prepared by the preparation method of the EPDM / PP TPV microfoam material described in the fifth aspect of the present invention.

[0022] According to a seventh aspect of the present invention, the application of the EPDM / PP TPV microfoamed material described in the sixth aspect of the present invention is provided in the fields of automotive lightweighting and rail transportation.

[0023] Through the above technical solution, the present invention first uses an inorganic foaming agent (the second foaming agent) to foam the foaming masterbatch, thereby reducing the density of the foaming masterbatch. Then, the EPDM / PP TPV material is uniformly dispersed with the low-density foaming masterbatch. Since the foaming masterbatch itself has been foamed and has a low density, the first foaming agent (e.g., foaming agent AC) is more uniformly dispersed in the TPV substrate. The prepared EPDM / PP TPV micro-foamed material has a lower amount of first foaming agent and higher tensile strength and elongation at break under the same foaming ratio. Detailed Implementation

[0024] 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.

[0025] According to a first aspect of the present invention, a raw material composition for foaming masterbatch is provided, wherein the composition comprises a matrix material, a filler oil, a first foaming agent, a second foaming agent, a co-foaming agent, and a surfactant, wherein the first foaming agent is one or more of azodicarbonamide, 4,4'-oxobis(benzenesulfonylhydrazine), trihydrazine triazine, and biuret, and the second foaming agent is an inorganic foaming agent.

[0026] According to the present invention, the amounts of the filler oil, the first foaming agent, the second foaming agent, the co-foaming agent, and the surfactant can be selected according to the matrix material. From the perspective of further reducing the amount of the first foaming agent and improving tensile strength and elongation at break, preferably, relative to 100 parts by weight of the matrix material, the content of the filler oil is 15-65 parts by weight, the content of the first foaming agent is 15-35 parts by weight, the content of the second foaming agent is 2-25 parts by weight, the content of the co-foaming agent is 5-20 parts by weight, and the content of the surfactant is 5-35 parts by weight; more preferably, relative to 100 parts by weight of the matrix material, the amount of the filler oil is 15-65 parts by weight, the amount of the first foaming agent is 15-35 parts by weight, the amount of the second foaming agent is 2-25 parts by weight, the amount of the co-foaming agent is 5-20 parts by weight, and the amount of the surfactant is 5-35 parts by weight. The matrix material contains 0 parts by weight of the filler oil, 20-60 parts by weight of the first foaming agent, 20-30 parts by weight of the second foaming agent, 4-20 parts by weight of the second foaming agent, 10-15 parts by weight of the co-foaming agent, and 10-30 parts by weight of the surfactant; more preferably, relative to 100 parts by weight of the matrix material, the filler oil contains 35-45 parts by weight of the first foaming agent, 23-27 parts by weight of the first foaming agent, 6-12 parts by weight of the second foaming agent, 11.5-13.5 parts by weight of the co-foaming agent, and 15-25 parts by weight of the surfactant.

[0027] According to the present invention, preferably, the matrix material is SEBS and / or POE; more preferably, the matrix material is SEBS elastomer. The styrene content in the SEBS elastomer is preferably 25-35 wt%.

[0028] According to the present invention, preferably, the filler oil is one or more of paraffin oil, naphthenic oil and aromatic oil; more preferably, the filler oil is paraffin oil.

[0029] According to the present invention, the first foaming agent is used for foaming EPDM / PP TPV (described later), and the second foaming agent is used for foaming the foaming masterbatch. In the present invention, the foaming masterbatch is first foamed using an inorganic foaming agent to reduce its density. Then, the EPDM / PP TPV material is uniformly dispersed with the foaming masterbatch. Since the foaming masterbatch itself has a low density due to foaming, the first foaming agent is more uniformly dispersed in the TPV substrate. The prepared EPDM / PP TPV micro-foamed material, at the same foaming ratio, requires a lower amount of the first foaming agent and exhibits higher tensile strength and elongation at break.

[0030] In this invention, the first blowing agent is one or more selected from azodicarbonamide (blowing agent AC), 4,4'-oxobis(benzenesulfonylhydrazine) (blowing agent OBSH), trihydrazine triazine (blowing agent THT), and biuret. Among them, azodicarbonamide is preferred.

[0031] In this invention, the second foaming agent is preferably one or more of sodium bicarbonate, ammonium bicarbonate, and water. Sodium bicarbonate is preferred.

[0032] In a particularly preferred embodiment of the present invention, the first foaming agent is azodicarbonamide, and the second foaming agent is sodium bicarbonate. This allows for a further reduction in the amount of the first foaming agent used, while improving tensile strength and elongation at break.

[0033] According to the present invention, preferably, the foaming agent is one or more of zinc stearate, magnesium stearate, sodium aluminum silicate and phthalic acid; more preferably, the foaming agent is zinc stearate and / or magnesium stearate; and even more preferably, the foaming agent is zinc stearate.

[0034] According to the present invention, preferably, the surfactant is one or more selected from stearic acid, zinc oxide, sodium lauryl sulfate and organosilicon; more preferably, the surfactant is stearic acid or zinc oxide; and even more preferably, the surfactant is stearic acid.

[0035] In a preferred embodiment of the present invention, the matrix material is POE, the filler oil is paraffin oil, the first foaming agent is azodicarbonamide, the second foaming agent is sodium bicarbonate, the foaming aid is zinc stearate, and the surfactant is stearic acid.

[0036] In another preferred embodiment of the present invention, the matrix material is SEBS elastomer, the filler oil is paraffin oil, the first foaming agent is azodicarbonamide, the second foaming agent is sodium bicarbonate, the foaming aid is zinc stearate, and the surfactant is stearic acid.

[0037] According to a second aspect of the present invention, a foaming masterbatch is provided, wherein it is obtained by mixing the foaming masterbatch described in the first aspect of the present invention with a raw material composition and then extruding, foaming, and granulating it.

[0038] According to the present invention, preferably, the matrix material, the filler oil, the first foaming agent, the second foaming agent, the co-foaming agent, and the surfactant are mixed and then fed into a twin-screw extruder for extrusion foaming granulation. More preferably, the matrix material and the filler oil are first mixed, and then the mixture is secondly mixed with the first foaming agent, the second foaming agent, the co-foaming agent, and the surfactant before being fed into a twin-screw extruder for extrusion foaming granulation.

[0039] The first mixing can be carried out as long as it can be uniform, for example, in a mixer, and the temperature of the first mixing can be, for example, 10-45°C (preferably room temperature).

[0040] The second mixing can be carried out as long as it can be uniformly mixed, for example, in a mixer, and the temperature of the second mixing can be, for example, 10-45°C (preferably room temperature).

[0041] The above-mentioned extrusion foaming granulation is carried out in a twin-screw extruder. Preferably, the extrusion temperature is 90-120℃ and the twin-screw speed is 150-300 rpm; more preferably, the extrusion temperature is 95-110℃ and the twin-screw speed is 180-250 rpm. By extruding in a twin-screw extruder, the second foaming agent (inorganic foaming agent) foams the foaming masterbatch at the extrusion temperature to obtain foaming masterbatch.

[0042] According to a third aspect of the present invention, a method for preparing foaming masterbatch is provided, wherein the method includes the step of mixing the foaming masterbatch described in the first aspect of the present invention with a raw material composition and then performing extrusion foaming granulation.

[0043] According to the present invention, preferably, the matrix material, the filler oil, the first foaming agent, the second foaming agent, the co-foaming agent, and the surfactant are mixed and then fed into a twin-screw extruder for extrusion foaming granulation. More preferably, the matrix material and the filler oil are first mixed, and then the mixture is secondly mixed with the first foaming agent, the second foaming agent, the co-foaming agent, and the surfactant before being fed into a twin-screw extruder for extrusion foaming granulation.

[0044] The first mixing can be carried out as long as it can be uniform, for example, in a mixer, and the temperature of the first mixing can be, for example, 10-45°C (preferably room temperature).

[0045] The second mixing can be carried out as long as it can be uniformly mixed, for example, in a mixer, and the temperature of the second mixing can be, for example, 10-45°C (preferably room temperature).

[0046] The above-mentioned extrusion foaming granulation is carried out in a twin-screw extruder. Preferably, the extrusion temperature is 90-120℃ and the twin-screw speed is 150-300 rpm; more preferably, the extrusion temperature is 95-110℃ and the twin-screw speed is 180-250 rpm. By extruding in a twin-screw extruder, the second foaming agent (inorganic foaming agent) foams the foaming masterbatch at the extrusion temperature to obtain foaming masterbatch.

[0047] According to a fourth aspect of the present invention, an EPDM / PP TPV microfoaming material composition is provided, wherein the microfoaming material comprises EPDM / PP TPV and a foaming masterbatch prepared by the preparation method of the foaming masterbatch described in the second aspect of the present invention or the foaming masterbatch described in the third aspect of the present invention, wherein the content of the foaming masterbatch is 2-8 parts by weight relative to 100 parts by weight of EPDM / PP TPV.

[0048] According to the present invention, preferably, the content of the foaming masterbatch is 4-6 parts by weight relative to 100 parts by weight of EPDM / PP TPV.

[0049] According to a fifth aspect of the present invention, a method for preparing an EPDM / PP TPV microfoamed material is provided, wherein the microfoamed material is obtained by extruding and granulating the EPDM / PP TPV microfoamed material composition described in the fourth aspect of the present invention.

[0050] According to the present invention, preferably, the micro-foamed material is obtained by mixing the EPDM / PP TPV and the foaming masterbatch and then feeding them into a twin-screw extruder for extrusion granulation.

[0051] The above mixing only needs to achieve uniform mixing, for example, it can be carried out in a mixer, and the mixing temperature can be, for example, 10-45℃ (preferably room temperature).

[0052] The above extrusion granulation is carried out in a twin-screw extruder. Preferably, the extrusion temperature is 180-220℃ and the twin-screw speed is 150-400 rpm; more preferably, the extrusion temperature is 190-210℃ and the twin-screw speed is 250-350 rpm.

[0053] According to a sixth aspect of the present invention, an EPDM / PP TPV microfoam material prepared according to the fifth aspect of the present invention is provided.

[0054] According to a seventh aspect of the present invention, the application of the EPDM / PP TPV microfoamed material described in the sixth aspect of the present invention is provided in the fields of automotive lightweighting and rail transportation.

[0055] The EPDM / PP TPV microfoamed material provided by this invention effectively improves the dispersion of the first foaming agent (e.g., foaming agent AC) in the TPV substrate by adding foamed low-density foaming masterbatch. The TPV material foams more uniformly, and the tensile strength and elongation at break are greatly improved, thereby greatly expanding the application range of EPDM / PP TPV microfoamed material, which can be widely used in automotive lightweighting and rail transportation.

[0056] The present invention will be described in detail below through embodiments, but the present invention is not limited to the following embodiments.

[0057] Example 1

[0058] Examples 1-22 and Comparative Examples 1-2 were prepared using the following methods and the amounts shown in Tables 1-3, respectively, to produce EPDM / PPTPV microfoamed materials. The preparation methods are as follows:

[0059] (1) Paraffin oil (6110, Total) was added to the base material SEBS (505, Baling Petrochemical) in a mixer in proportion (the base material used in Example 19 was POE); the oil-extended SEBS, foaming agent (commercially available), foaming agent zinc stearate (commercially available), surfactant stearic acid (commercially available), and inorganic foaming agent sodium bicarbonate (commercially available) were mixed evenly in a blender (SVM-25-EB, Tianjin Xinyi) in proportion, and then added to a twin-screw extruder (STS35, Nanjing Koperon) for extrusion granulation. The extrusion temperature was 100°C and the twin-screw speed was 200 rpm. During the twin-screw extrusion process, the sodium bicarbonate foamed the foaming masterbatch at the extrusion temperature to obtain low-density foaming masterbatch.

[0060] (2) EPDM / PP TPV (21-64A, Shandong Dawn) and low-density foaming masterbatch are mixed evenly in a blender in a certain proportion, and then fed into a twin-screw extruder for extrusion granulation to obtain EPDM / PP TPV micro foamed material. The extrusion temperature is 200℃ and the twin-screw speed is 300rpm.

[0061] Table 1

[0062]

[0063] Table 2

[0064]

[0065] Table 3

[0066]

[0067] Test Example 1-22 and Comparative Test Example 1-2

[0068] Test Examples 1-22 and Comparative Test Examples 1-22 respectively tested the EPDM / PPTPV microfoamed materials prepared in Examples 1-22 and Comparative Examples 1-2 as follows, and the test results are shown in Table 4-6.

[0069] (1) Tensile strength

[0070] According to ASTM D412 testing, the tensile rate is 500 mm / min.

[0071] (2) Elongation at break

[0072] According to ASTM D412 testing, the tensile rate is 500 mm / min.

[0073] Table 4

[0074]

[0075] Table 5

[0076]

[0077] Table 6

[0078]

[0079] By comparing Examples 1-19 with Comparative Example 1, it can be seen that Examples 1-19 have higher tensile strength and elongation at break than Comparative Example 1, which uses only foaming agent AC.

[0080] By comparing Examples 1-19 with Comparative Example 2, it can be seen that Examples 1-19 have higher tensile strength and elongation at break compared to Comparative Example 2, which uses only sodium bicarbonate.

[0081] By comparing Examples 5-8 and 14-16 with Comparative Example 1, it can be seen that Examples 5-8 and 14-16 have higher tensile strength and elongation at break even when using less foaming agent AC.

[0082] Therefore, it can be seen that the present invention first uses an inorganic foaming agent to foam the foaming masterbatch to reduce the density of the foaming masterbatch, and then uniformly disperses the EPDM / PP TPV material with the low-density foaming masterbatch. Since the foaming masterbatch itself has been foamed and has a low density, the first foaming agent is more uniformly dispersed in the TPV substrate. The prepared EPDM / PP TPV micro-foamed material has a lower amount of first foaming agent and higher tensile strength and elongation at break under the same foaming ratio.

[0083] 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 raw material composition for foaming masterbatch, characterized in that, The composition comprises a matrix material, a filler oil, a first foaming agent, a second foaming agent, a co-foaming agent, and a surfactant, wherein the first foaming agent is one or more of azodicarbonamide, 4,4'-oxobis(benzenesulfonylhydrazine), trihydrazine triazine, and biuret, and the second foaming agent is an inorganic foaming agent.

2. The raw material composition for foaming masterbatch according to claim 1, wherein, Relative to 100 parts by weight of the matrix material, the content of the filler oil is 15-65 parts by weight, the content of the first foaming agent is 15-35 parts by weight, the content of the second foaming agent is 2-25 parts by weight, the content of the co-foaming agent is 5-20 parts by weight, and the content of the surfactant is 5-35 parts by weight; or Relative to 100 parts by weight of the matrix material, the content of the filler oil is 20-60 parts by weight, the content of the first foaming agent is 20-30 parts by weight, the content of the second foaming agent is 4-20 parts by weight, the content of the foaming aid is 10-15 parts by weight, and the content of the surfactant is 10-30 parts by weight.

3. The raw material composition for foaming masterbatch according to claim 1, wherein, The matrix material is SEBS and / or POE, preferably SEBS elastomer.

4. The raw material composition for foaming masterbatch according to any one of claims 1-3, wherein, The second foaming agent is one or more of sodium bicarbonate, ammonium bicarbonate, and water; or The first foaming agent is azodicarbonamide, and the second foaming agent is sodium bicarbonate.

5. The raw material composition for foaming masterbatch according to any one of claims 1-3, wherein, The foaming agent is zinc stearate and / or magnesium stearate, preferably zinc stearate; and / or The surfactant is stearic acid or zinc oxide, preferably stearic acid; and / or The filler oil is paraffin oil.

6. A foaming masterbatch, characterized in that, It is obtained by mixing the foaming masterbatch described in any one of claims 1-5 with the raw material composition and then extruding, foaming, and granulating it.

7. A method for preparing foaming masterbatch, characterized in that, The method includes the step of mixing the foaming masterbatch according to any one of claims 1-5 with a raw material composition and then extruding, foaming and granulating it.

8. The method according to claim 7, wherein, The matrix material, the filler oil, the first foaming agent, the second foaming agent, the foaming aid, and the surfactant are mixed and then fed into a twin-screw extruder for extrusion foaming and granulation.

9. The method according to claim 8, wherein, The extrusion temperature is 90-120℃, and the twin-screw speed is 150-300rpm.

10. An EPDM / PP TPV microfoam material composition, characterized in that, The microfoamed material comprises EPDM / PP TPV and foamed masterbatch prepared by the method of foamed masterbatch preparation according to claim 6 or any one of claims 7-9, wherein the content of foamed masterbatch is 2-8 parts by weight relative to 100 parts by weight of EPDM / PP TPV.

11. A method for preparing EPDM / PP TPV microfoamed material, characterized in that, The microfoamed material is obtained by extruding and granulating the EPDM / PP TPV microfoamed material composition according to claim 10.

12. The method according to claim 11, wherein, The micro-foamed material is obtained by mixing EPDM / PP TPV and the foaming masterbatch, and then feeding the mixture into a twin-screw extruder for extrusion granulation.

13. The method according to claim 12, wherein, The extrusion temperature is 180-220℃, and the twin-screw speed is 150-400rpm.

14. The EPDM / PP TPV microfoamed material prepared by the preparation method of any one of claims 11-13.

15. The application of the EPDM / PP TPV microfoamed material according to claim 14 in the fields of automotive lightweighting and rail transportation.

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