TPE (thermoplastic elastomer) material as well as preparation method and application thereof

Abstract

The invention provides a TPE (thermoplastic elastomer) material as well as a preparation method and application thereof. The TPE material comprises the following raw materials in parts by mass: 20-40 parts of a first matrix material, 20-30 parts of a second matrix material, 1-5 parts of a compatilizer and 20-50 parts of base oil, the first base material comprises a hydrogenated styrene-butadiene-styrene block copolymer and / or a styrene-butadiene-styrene block copolymer, the number-average molecular weight of the hydrogenated styrene-butadiene-styrene block copolymer and / or the styrene-butadiene-styrene block copolymer is 18-22 w, and the content of styrene is 30-33 wt%; the second matrix material includes polypropylene. The prepared TPE material is small in smell and simple in preparation process, and when the TPE material is used for manufacturing the TPE skin of the automobile instrument board, the high-flexibility TPE skin can be obtained without an additional foaming material. The flexibility is further improved by designing the structure of the TPE skin.

Description

Technical Field

[0001] The present invention relates to the technical field of TPE material processing, and in particular to a TPE material and a preparation method and application thereof. Background Art

[0002] Thermoplastic Elastomer (TPE) is a linear block copolymer with hard segments and soft segments. It combines the excellent properties of rubber, such as high elasticity, aging resistance, and oil resistance, with the easy processing of thermoplastic materials, and has broad application prospects.

[0003] In the prior art, automotive dashboard skins are typically produced using slush-molded PVC or negative-molded TPO+PP foam processes, but these processes suffer from strong odor and complex processes. Injection-molded TPE overcomes these drawbacks, offering a lower odor and simpler process. However, injection-molded TPE produces a rigid TPE material, which has a poor feel when used as a dashboard skin. To improve this feel, the commonly used method involves adding a foaming material to the prepared TPE material, requiring an additional foaming step, which negates the advantage of injection-molded TPE's simplicity.

[0004] Therefore, how to reduce the hardness of the TPE surface while simplifying the process and obtain a car dashboard with a better feel is an urgent problem that needs to be solved. Summary of the Invention

[0005] The present invention provides a TPE material with low odor. When used for preparing a TPE surface, the use of a foaming material can be avoided. The process is simple and the problems in the prior art can be overcome.

[0006] The present invention also provides a method for preparing a TPE material. The TPE material prepared by the method has a simple process and can reduce the hardness of the TPE surface.

[0007] The present invention also provides a TPE skin comprising the above TPE material. The TPE skin has low odor and low hardness.

[0008] The present invention also provides an automobile instrument panel, comprising the above-mentioned TPE surface skin, and the surface skin of the automobile instrument panel has a good hand feel.

[0009] The present invention provides a TPE material, the raw materials of which, calculated by weight, include: 20-40 parts of a first base material, 20-30 parts of a second base material, 1-5 parts of a compatibilizer, and 20-50 parts of a base oil;

[0010] The first matrix material comprises hydrogenated styrene-butadiene-styrene block copolymer and / or styrene-butadiene-styrene block copolymer, wherein the hydrogenated styrene-butadiene-styrene block copolymer and / or styrene-butadiene-styrene block copolymer has a number average molecular weight of 18-22 wt% and a styrene content of 30%-33 wt%;

[0011] The second matrix material includes polypropylene.

[0012] According to one embodiment of the present invention, the polypropylene has a linear structure and a melt index of 20 g / 10 min-50 g / 10 min.

[0013] The present invention also provides a method for preparing a TPE material, comprising mixing the first matrix material, the second matrix material, a compatibilizer, and a base oil and then granulating the mixture to obtain the TPE material.

[0014] According to one embodiment of the present invention, the first matrix material and base oil are mixed for at least 3 minutes, and then a compatibilizer and the matrix material are added and mixed for at least 5 minutes to obtain a raw material mixture;

[0015] The raw material mixture is granulated at 180-220° C. to obtain the TPE material.

[0016] The present invention also provides a TPE skin, which is prepared using the aforementioned TPE material or the TPE material obtained by the aforementioned preparation method.

[0017] According to one embodiment of the present invention, the TPE skin comprises a planar layer and N protruding structures arranged on the planar layer, where N≥1.

[0018] According to one embodiment of the present invention, the demoulding angle of the TPE skin is 1.5-3° on one side;

[0019] The top and bottom ends of the protruding structure are chamfered, and the chamfer height is no greater than 1 / 4 of the dimension of the protruding structure perpendicular to the planar layer.

[0020] According to one embodiment of the present invention, the width of the protrusion structure in a direction parallel to the planar layer is 25-100% of the thickness of the planar layer, the height of the protrusion structure in a direction perpendicular to the planar layer is 100-250% of the width of the protrusion structure in a direction parallel to the planar layer, and the spacing between two adjacent protrusions is 100-200% of the width of the protrusion structure in a direction parallel to the planar layer.

[0021] According to one embodiment of the present invention, the ratio of the thickness of the planar layer to the height of the protruding structure is (0.4-1.2): (0.2-0.6).

[0022] The present invention also provides an automobile instrument panel, comprising the TPE surface skin described above.

[0023] The present invention selects raw materials with high fluidity and strong molecular chain flexibility, and controls the ratio of the raw materials and the molecular weight and styrene content of the hydrogenated styrene-butadiene-styrene block copolymer or styrene-butadiene-styrene block copolymer in the raw materials. As a result, the prepared TPE material has low hardness, low odor, and a simple preparation process. When preparing a TPE skin using the TPE material, no additional foaming material needs to be added, and the obtained TPE skin has high flexibility. By performing 3D structural design on the TPE skin and molding parts with the 3D structure, the prepared TPE parts have low hardness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the three-dimensional TPE skin prepared in Example 1, Examples 4-11, and Comparative Examples 1-8;

[0025] Figure 2 Schematic top views of TPE skins prepared in Example 1, Examples 4-11, and Comparative Examples 1-8;

[0026] Figure 3 Schematic side views of TPE skins prepared in Example 1, Examples 4-11, and Comparative Examples 1-8;

[0027] Figure 4 Schematic side views of TPE skins prepared in Example 1, Examples 4-11, and Comparative Examples 1-8;

[0028] Figure 5 is a schematic three-dimensional diagram of the TPE skin prepared in Example 2;

[0029] Figure 6 Schematic top view of the TPE skin prepared in Example 2;

[0030] Figure 7 is a schematic side view of the TPE skin prepared in Example 2;

[0031] Figure 8 is a schematic side view of the TPE skin prepared in Example 2;

[0032] Figure 9 is a three-dimensional schematic diagram of the TPE skin prepared in Example 3;

[0033] Figure 10 3 is a schematic top view of the TPE skin prepared in Example 3;

[0034] Figure 11is a schematic side view of the TPE skin prepared in Example 3;

[0035] Figure 12 Schematic side view of the TPE skin prepared in Example 3. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below. The specific embodiments listed below are only for describing the principles and features of the present invention. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts are within the scope of protection of the present invention.

[0037] The first aspect of the present invention provides a TPE material, wherein the raw materials thereof, calculated by weight, include: 20-40 parts of a first matrix material, 20-30 parts of a second matrix material, 1-5 parts of a compatibilizer, and 20-50 parts of a base oil;

[0038] The first matrix material comprises hydrogenated styrene-butadiene-styrene block copolymer (SEBS) or styrene-butadiene-styrene block copolymer (SBS), wherein the number average molecular weight of the styrene-butadiene-styrene block copolymer or the styrene-butadiene-styrene block copolymer is 18-22 wt % and the styrene content is 30%-33 wt %;

[0039] The second matrix material includes polypropylene (PP).

[0040] The compatibilizer is a substance that improves the compatibility between the first and second substrate materials. The present invention is not limited to a specific type of compatibilizer; for example, it may be an ethylene-octene copolymer or a maleic anhydride-grafted compatibilizer. To improve adhesion and compatibility between PP and SEBS, a maleic anhydride-grafted compatibilizer is preferred.

[0041] The base oil is a substance that comprises 70-90% by weight of the main components of lubricating oils and greases. The present invention is not limited to a specific type of base oil. For example, it may include white oil or paraffin oil. For compatibility with SEBS, paraffin oil is preferred.

[0042] The number average molecular weight of the above SEBS or SBS is preferably 22w; and the styrene content is preferably 30%.

[0043] By selecting the above raw materials and controlling the ratio of each component, the molecular weight of SEBS or SBS in the first matrix material, and the styrene content, the hardness of the TPE material can be reduced. The inventors believe that this may be due to the high fluidity and flexible molecular chains of the above raw materials.

[0044] It should be noted that the second matrix material may also be PE and / or PS, but the amount used is different from that of PP. If PE and / or PS is to be used, the amount needs to be adjusted.

[0045] In order to further improve the flexibility of the TPE material, the present invention further selects a second matrix material comprising linear structure PP as raw material, and the melt index of PP is 20 g / 10 min-50 g / 10 min, preferably 30 g / 10 min.

[0046] In a specific implementation process, the TPE material is obtained by a preparation method including the following processes:

[0047] The first base material, the second base material, the compatibilizer and the base oil are mixed and then granulated to obtain a TPE material.

[0048] The process for preparing TPE materials is simple and helps reduce the production cost of TPE materials. The TPE materials obtained through granulation are easy to transport, which can improve the flexibility of the TPE skin production process.

[0049] In a specific implementation, in order to ensure that the first matrix material, the second matrix material, the compatibilizer, and the base oil are uniformly mixed, the mixed materials may be stirred for at least 30 minutes.

[0050] It is understood that during the preparation of TPE materials, in order to improve the material's processability, it is necessary to add certain additives. These additives are mixed with the first and second matrix materials, the compatibilizer, and the base oil. In the present invention, the additives used include stabilizers, such as antioxidants such as phenols, hydroxybenzoates, and phosphates, and are used in amounts of 1-2 parts by weight.

[0051] A second aspect of the present invention provides a method for preparing a TPE material, comprising: mixing a first matrix material, a second matrix material, a compatibilizer, and a base oil, and then granulating the mixture to obtain the TPE material.

[0052] The present invention mixes the first base material and the base oil for at least 3 minutes, then adds a compatibilizer and the base material and mixes for at least 5 minutes to obtain a raw material mixture;

[0053] The raw material mixture is granulated to obtain TPE material.

[0054] The above raw material mixing step can further improve the compatibility of the first matrix material and the second matrix material, which is beneficial to reducing the hardness of the TPE material.

[0055] When using this method, the additive is added together with the compatibilizer and the base material and mixed to obtain a raw material mixture.

[0056] In a specific implementation process, the temperature of the granulation treatment is 180-220°C.

[0057] A third aspect of the present invention provides a TPE skin made from the aforementioned TPE material, or a TPE material obtained by the aforementioned preparation method. This TPE skin has the advantage of low odor and can be used to obtain a highly flexible TPE skin without the need for additional foaming material.

[0058] The TPE skin comprises a planar layer and N protruding structures arranged on the planar layer, where N≥1.

[0059] Among them, the raised structure can be located on one side or both sides of the planar layer of the planar structure, and the present invention does not limit this. The present invention also does not limit the specific shape of the protrusion, which can be a regular shape or an irregular shape. For the sake of economy and ease of operation, the shape of the raised structure is preferably cylindrical, rib-shaped, or conical. Among them, the circular surface of the cone is close to one side of the planar layer. When the raised structure is in the shape of multiple ribs, it can be a plurality of mutually parallel ribs or mutually staggered ribs, and further, the staggered angle between the staggered ribs is 90°. The number of raised structures and the spacing between any two raised structures can also be selected by the inventor according to actual needs.

[0060] Compared with conventional TPE skins that only include a planar layer, the structure of the present invention can reduce the shear modulus and bulk modulus of the TPE skin under external force, and can produce a larger vertical stress displacement when subjected to the same load. Therefore, the TPE skin prepared by the present invention has high flexibility.

[0061] During specific implementation, this structure can be realized by designing the mold shape when injecting TPE materials. In order to facilitate the removal of the TPE skin from the injection mold, the demoulding angle of the TPE skin can also be set. Preferably, the demoulding angle of the planar layer of the TPE skin is 1.5-3° on one side. The top and bottom ends of the raised structure (the top end refers to the corner of the raised structure away from the planar layer; the bottom end refers to the connection between the raised structure and the planar layer) can be moderately chamfered, that is, the right-angled edges of the top and bottom ends of the raised structure are processed into angled planes, wherein the plane can be square or circular, which can be selected according to actual needs. Preferably, the chamfer height is not greater than 1 / 4 of the dimension of the raised structure perpendicular to the planar layer (raised height).

[0062] It is understood that the number of protrusions and the spacing between them will have a certain impact on flexibility. In one embodiment, the width of the protrusions in a direction parallel to the planar layer is 25-100% of the thickness of the planar layer, the height of the protrusions in a direction perpendicular to the planar layer is 100-250% of the width of the protrusions in a direction parallel to the planar layer, and the spacing between two adjacent protrusions is 100-200% of the width of the protrusions in a direction parallel to the planar layer.

[0063] Preferably, when the shape of the protrusion structure is cylindrical, the width of the protrusion structure in the direction parallel to the planar layer refers to the diameter of the circular surface of the cylindrical protrusion structure, and the diameter of the circular surface is 25-60% of the thickness of the planar layer; the height of the protrusion structure in the direction perpendicular to the planar layer refers to the height of the cylindrical protrusion structure, and the protrusion height is 100-200% of the diameter of the circular surface; the spacing between two adjacent protrusions refers to the spacing between the center points of two adjacent cylindrical protrusion structures, and the spacing between the center points is 120-200% of the diameter of the circular surface.

[0064] When the shape of the raised structure is a rib-like shape, the width of the raised structure in the direction parallel to the plane layer refers to the width of the rib raised structure, and the rib width is 40-80% of the thickness of the plane layer. The height of the raised structure in the direction perpendicular to the plane layer refers to the height of the rib raised structure, and the rib height is 100-250% of the rib width. The spacing between two adjacent raised structures refers to the outer side spacing of two adjacent rib-like raised structures, and the outer side spacing is 100-150% of the rib width.

[0065] When the shape of the protrusion structure is conical, the width of the protrusion structure in the direction parallel to the planar layer refers to the circular diameter of the bottom end of the conical protrusion structure, and the circular diameter is 50-80% of the thickness of the planar layer. The spacing between two adjacent protrusions refers to the spacing between two adjacent conical protrusion structures, and the spacing between two adjacent conical protrusion structures is 100-180% of the circular diameter.

[0066] According to the inventors' research, when the thickness of the planar layer and the height of the protruding structure are controlled to be (0.4-1.2): (0.2-0.6), it is more conducive to improving the flexibility of the TPE surface.

[0067] In a specific implementation, the TPE skin can be obtained by directly injection molding after mixing the raw materials of the TPE material, or by granulating the TPE material and then injection molding the resulting granules to obtain the TPE skin; the injection molding temperature is 190-230°C. By injection molding this TPE material, no additional foaming process is required, and the resulting TPE skin has a low hardness.

[0068] A fourth aspect of the present invention provides an automobile instrument panel, comprising the aforementioned TPE skin.

[0069] In a specific embodiment, the automobile instrument panel further comprises a PP+EPDM-TD20 or PP-LGF20 skeleton, wherein the TPE skin covers the skeleton.

[0070] The above-mentioned PP+EPDM-TD20 refers to polypropylene modified with EPDM rubber and 20% talc powder; the above-mentioned PP-LGF20 refers to polypropylene modified with 20% long glass fiber.

[0071] The car dashboard is more comfortable to the touch and has less odor.

[0072] The present invention does not limit the bonding method of the TPE skin and the skeleton. The injection-molded TPE skin and the skeleton can be bonded by an adhesive, which can be a chloroprene type, a polyurethane type, an acrylic type, etc.; the TPE skin and the skeleton can also be molded by two-color injection molding; two-color injection molding refers to using a two-color injection molding machine to first injection mold a hard glue such as PP+EPDM-TD20 at an injection temperature of 200-240°C, then flip the mold and inject a soft glue TPE at an injection temperature of 170-200°C.

[0073] Compared to bonding the car body and TPE skin with adhesive, the two-shot overmolding process creates an integrated instrument panel. The TPE skin and car body are well-compatible, improving the instrument panel's feel. This also reduces raw material usage, simplifies the process, and improves odor performance.

[0074] Hereinafter, the present invention will be described in more detail through specific examples.

[0075] Example 1

[0076] The automobile instrument panel of this embodiment is prepared by the following process:

[0077] 1) SEBS and white oil were mixed for 3 minutes, and then copolymerized PP (Shanghai Petrochemical, M2600R), a maleic anhydride grafted compatibilizer, and a phenolic antioxidant were added and mixed for 5 minutes to obtain a raw material mixture. The raw material mixture was mixed at 70°C and then added to a twin-screw extruder for granulation at an extrusion temperature of 200°C and a screw speed of 120 r / min to obtain a TPE material;

[0078] The number average molecular weight of SEBS is 18w, the styrene content in SEBS is 30wt%, and the melt index of PP is 30g / 10min. The TPE material includes 39 parts of SEBS, 20 parts of PP, 1 part of compatibilizer, 39 parts of white oil, and 0.5 parts of antioxidant.

[0079] 2) injection molding the TPE material at 210° C. to obtain a TPE skin;

[0080] The schematic diagram of the TPE skin structure prepared in this example is shown in Figure 1 、 2 , 3, 4, the area of ​​the raised structure is 50% of the overall structure area, it has a raised structure, the raised structure is cylindrical, the demoulding angle of the flat layer of the TPE skin is 2° on one side; the chamfer radius of the top and bottom ends of the raised structure is 0.1mm; the thickness of the flat layer is 0.8mm; the distance between the raised structures is 0.8mm, the height of the raised structure is 0.4mm, the diameter of the circular surface of the raised structure is 0.4mm, and the spacing between adjacent raised structures is 0.8mm;

[0081] 3) The surface of the PP+EPDM-TD20 skeleton is heated using an acetylene-oxygen flame, and then a water-based polyurethane adhesive is evenly applied to the surface of the PP+EPDM-TD20 skeleton to bond it to the TPE surface to obtain a car dashboard.

[0082] Example 2

[0083] The difference between this embodiment and embodiment 1 is that the schematic diagram of the TPE skin structure is shown in Figure 5 、 6 , 7, and 8, the area of ​​the raised structure is 50% of the overall structure area, the raised structure is in the shape of ribs, and the demoulding angle of the flat layer of the TPE skin is 2° on one side; the chamfer radius of the top and bottom ends of the raised structure is 0.1mm; the thickness of the flat layer is 0.8mm; the height of the reinforcement rib is 0.4mm, the width of the reinforcement rib is 0.4mm, and the distance between the outer edges of the two reinforcement ribs is 0.6mm.

[0084] Example 3

[0085] The difference between this embodiment and embodiment 1 is that the schematic diagram of the TPE skin structure is shown in Figure 9 、 10 , 11, 12, the area of ​​the raised structure is 30% of the overall structure area, the raised structure is conical, and the demoulding angle of the flat layer of the TPE skin is 2° on one side; the chamfer radius of the top and bottom ends of the raised structure is 0.1mm; the thickness of the flat layer is 0.6mm; the height of the raised structure is 0.4mm, the diameter of the raised side close to the plane is 0.3mm, and the spacing between adjacent raised structures is 0.1mm.

[0086] Example 4

[0087] The difference between this embodiment and embodiment 1 is that the diameter of the circular surface of the protruding structure is 0.2 mm, the height of the protruding structure is 0.2 mm, and the distance between two adjacent protruding structures is 0.4 mm.

[0088] Example 5

[0089] The difference between this embodiment and embodiment 1 is that:

[0090] 1) SBS and white oil were first mixed for 3 minutes, and then copolymerized PP, maleic anhydride grafted compatibilizer, and hydroxybenzoate antioxidant were added and mixed for 5 minutes to obtain a raw material mixture, and the raw material mixture was granulated at 70-80° C. to obtain a TPE material;

[0091] The number average molecular weight of SBS is 22w, the styrene content is 30wt%, and the melt index of PP is 20g / 10min. The TPE material includes 40 parts of SBS, 10 parts of PP, 2 parts of maleic anhydride grafted compatibilizer, 37.5 parts of white oil, and 0.5 parts of hydroxybenzoate antioxidant.

[0092] 2) injection molding the TPE material at 210° C. to obtain a TPE skin;

[0093] 3) The surface of the PP-LGF20 skeleton is heated with an acetylene-oxygen flame, and then a water-based polyurethane adhesive is evenly applied to the surface of the PP-LGF20 skeleton and bonded to the TPE skin to obtain a car dashboard.

[0094] Example 6

[0095] The difference between this embodiment and embodiment 1 is that the melt index of PP is 100 g / 10 min.

[0096] Example 7

[0097] The difference between this embodiment and embodiment 1 is that the melt index of PP is 15 g / 10 min.

[0098] Example 8

[0099] The difference between this embodiment and embodiment 1 is that SEBS, PP, compatibilizer, white oil, and additives are mixed together for 8 minutes and then granulated to obtain a TPE material, which is used to prepare a TPE skin.

[0100] Example 9

[0101] The difference between this embodiment and embodiment 1 is that the height of the protruding structure of the TPE skin is 1.0 mm.

[0102] Example 10

[0103] The difference between this embodiment and embodiment 1 is that the TPE surface has no protruding structure.

[0104] Comparative Example 1

[0105] The difference between this comparative example and Example 1 is that the number average molecular weight of SEBS in the TPE material is 27 wt %, and the styrene content is 34 wt %; the TPE skin prepared in this comparative example has no 3D structure.

[0106] Comparative Example 2

[0107] The difference between this comparative example and Example 1 is that the TPE material includes 50 parts of SEBS, 12 parts of PP, 1 part of a compatibilizer, 36.5 parts of white oil, and 0.5 parts of an antioxidant; and the TPE skin prepared in this comparative example has no 3D structure.

[0108] Comparative Example 3

[0109] The difference between this comparative example and Example 1 is that the TPE material includes 30 parts of SEBS, 31 parts of PP, 1 part of compatibilizer, and 38 parts of white oil; and the TPE skin prepared in this comparative example has no 3D structure.

[0110] Comparative Example 4

[0111] The difference between this comparative example and Example 1 is that the TPE material includes 26 parts of SEBS, 22 parts of PP, 1 part of a compatibilizer, and 51 parts of white oil; and the TPE skin prepared in this comparative example has no 3D structure.

[0112] Comparative Example 5

[0113] The difference between this comparative example and Example 1 is that no compatibilizer is added; the TPE skin prepared in this comparative example has no 3D structure.

[0114] Test Example 1

[0115] The Shore hardness of the TPE skins prepared in the examples and comparative examples was tested using the hardness test method GB / T531.1 standard. The odor performance of the TPE skins was evaluated using the Q / JLYJ7111800A-2022 standard. The results are shown in Table 1.

[0116] Table 1

[0117]

[0118]

[0119] As can be seen from the above table, by comparing Examples 1-10 with Comparative Examples 1-5, it can be seen that by controlling the components and component ratios of the raw materials, the TPE material prepared by the present invention has a low odor. When the TPE material is prepared into a TPE skin with a suitable protrusion structure, the prepared TPE skin has a low Shore A hardness. This shows that the present invention successfully prepares an automotive instrument panel skin with excellent odor performance and flexibility through a simple process.

[0120] Finally, it should be noted that the above description of the technical solutions of the present invention clearly and completely combines specific embodiments. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

Claims

1. A TPE material, characterized in that: The raw materials thereof include, by weight: 20-40 parts of a first base material, 20-30 parts of a second base material, 1-5 parts of a compatibilizer, and 20-50 parts of a base oil; The first matrix material comprises hydrogenated styrene-butadiene-styrene block copolymer and / or styrene-butadiene-styrene block copolymer, wherein the hydrogenated styrene-butadiene-styrene block copolymer and / or styrene-butadiene-styrene block copolymer has a number average molecular weight of 18-22 wt% and a styrene content of 30-33 wt%; The second matrix material includes polypropylene.

2. The TPE material according to claim 1, characterized in that The polypropylene has a linear structure and a melt index of 20 g / 10 min to 50 g / 10 min.

3. A method for preparing the TPE material according to claim 1 or 2, characterized in that: include: The first matrix material, the second matrix material, the compatibilizer and the base oil are mixed and then granulated to obtain the TPE material.

4. The method for preparing the TPE material according to claim 3, wherein: Mixing the first matrix material and base oil for at least 3 minutes, then adding a compatibilizer and the matrix material and mixing for at least 5 minutes to obtain a raw material mixture; The raw material mixture is granulated at 180-220° C. to obtain the TPE material.

5. A TPE skin, characterized in that: The invention is prepared by using the TPE material according to claim 1 or 2, or the TPE material obtained by the preparation method according to claim 3 or 4.

6. The TPE skin according to claim 5, characterized in that The TPE skin includes a planar layer and N protruding structures arranged on the planar layer, where N≥1.

7. The TPE skin according to claim 5 or 6, characterized in that The demoulding angle of the planar layer of the TPE skin is 1.5-3° on one side; The top and bottom ends of the protruding structure are chamfered, and the chamfer height is no greater than 1 / 4 of the dimension of the protruding structure perpendicular to the planar layer.

8. The TPE skin according to any one of claims 5 to 7, characterized in that: The width of the protrusion structure in a direction parallel to the planar layer is 25-100% of the thickness of the planar layer, the height of the protrusion structure in a direction perpendicular to the planar layer is 100-250% of the width of the protrusion structure in a direction parallel to the planar layer, and the spacing between two adjacent protrusions is 100-200% of the width of the protrusion structure in a direction parallel to the planar layer.

9. The TPE skin according to claim 8, characterized in that The ratio of the thickness of the planar layer to the height of the protruding structure is (0.4-1.2): (0.2-0.6).

10. A car dashboard, characterized in that: The invention comprises the TPE skin according to any one of claims 5 to 9.

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