SBS resin and application thereof in preparation of TPEE composite material

Abstract

The invention discloses SBS resin and application thereof in preparation of a TPEE composite material, and belongs to the technical field of polymer engineering plastics. The SBS resin provided by the invention is prepared from the following raw materials in parts by mass: 80 parts of hydrogenated SBS resin, 0.8 to 1.5 parts of trimethylallyl isocyanate, 0.5 to 1 part of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, 15 to 25 parts of paraffin oil and 1 to 3 parts of a lubricating agent. When the SBS resin provided by the invention is applied to preparation of the TPEE composite material, the obtained TPEE composite material has excellent fluidity and mechanical strength, and also has a lower glossiness grade.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer engineering plastics, and in particular relates to an SBS resin and an application thereof in preparing a TPEE composite material. Background Art

[0002] TPEE (thermoplastic polyester elastomer) is a high-performance engineering-grade elastomer that combines the elasticity of rubber with the strength of engineering plastics while offering the processing ease of thermoplastics. It possesses excellent heat and chemical resistance, as well as a pleasant feel, making it a popular choice for molding parts that come into contact with humans. Due to its excellent feel, TPEE has promising applications in surface coverings such as seats, automotive door panels, and dashboard skins. However, the high gloss and low fluidity of conventional TPEE materials pose challenges in both appearance and molding. Prior art attempts to address this issue include adding fillers to TPEE, but the introduction of fillers reduces the mechanical strength of the TPEE material. Summary of the Invention

[0003] The object of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide an SBS resin which, when used in the preparation of TPEE composite materials, can enable the TPEE composite materials to have excellent fluidity, lower gloss level and better mechanical strength, and its application in the preparation of TPEE composite materials.

[0004] To achieve the above object, in a first aspect of the present invention, the present invention provides an SBS resin, wherein the SBS resin comprises the following raw materials in parts by weight:

[0005] 80 parts of hydrogenated SBS resin, 0.8-1.5 parts of trimethylallyl isocyanate, 0.5-1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 15-25 parts of paraffin oil, and 1-3 parts of lubricant.

[0006] The present invention provides an SBS resin, which is prepared by selecting hydrogenated SBS resin as a raw material, simultaneously selecting 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and hydrogenated SBS resin to undergo a cross-linking reaction under the action of a specific cross-linking agent, and supplementing with appropriate amounts of paraffin oil and lubricant. The obtained SBS resin has low fluidity and a unique chain structure. Therefore, when it is subsequently used in the preparation of a TPEE composite material, it can form a microscopic sea-island structure with the TPEE resin, thereby reducing the macroscopic gloss of the TPEE composite material while retaining the excellent mechanical strength and good fluidity of TPEE.

[0007] The present invention has no special requirements on the hydrogenation rate of the hydrogenated SBS resin, which can be within the conventional range in the art.

[0008] For example, the hydrogenation rate of the hydrogenated SBS resin may be 40-60%. The hydrogenation rate is tested by scanning the sample using a nuclear magnetic resonance analyzer to obtain a nuclear magnetic resonance spectrum, and then calculating the relative content of unsaturated double bonds in the sample by integrating the areas of each structural characteristic peak in the spectrum, thereby further calculating the degree of hydrogenation.

[0009] The present invention has no particular limitation on the viscosity of the paraffin oil, and the viscosity can be within the range of the paraffin oil conventionally used in the art. For example, the viscosity of the paraffin oil at 40°C can be 5-110 mm 2 / s.

[0010] The present invention has no particular limitation on the selection of lubricant, and any lubricant commonly used in the art can be used. For example, the lubricant includes at least one of silicone, silicone oil, and erucamide.

[0011] As a preferred embodiment of the SBS resin of the present invention, the viscosity of a 20 wt % toluene solution of the hydrogenated SBS resin is 500-1200 Pa·s.

[0012] It should be noted that the viscosity of the 20 wt % toluene solution of the hydrogenated SBS resin is obtained by testing with reference to the Q / SH1085130-2006 standard.

[0013] Illustratively, the viscosity of a 20 wt% toluene solution of the hydrogenated SBS resin may be any point value or any two point range values between 500-1200 Pa·s, for example, 600-1000 Pa·s, or 500 Pa·s, 550 Pa·s, 600 Pa·s, 650 Pa·s, 700 Pa·s, 750 Pa·s, 800 Pa·s, 850 Pa·s, 900 Pa·s, 950 Pa·s, 1000 Pa·s, etc.

[0014] In a second aspect of the present invention, the present invention provides a method for preparing the SBS resin, which comprises the following steps: mixing the components uniformly and then melt-extruding to obtain the SBS resin.

[0015] As a preferred embodiment of the preparation method of the present invention, in the melt extrusion, the aspect ratio of the twin-screw extruder is ≥56:1, the screw speed is 350-450 r / min, and the temperature is 120-180°C.

[0016] In a third aspect of the present invention, the present invention provides a TPEE composite material, wherein the TPEE composite material comprises the following components in parts by mass:

[0017] 58-82 parts of TPEE resin, 8-32 parts of the SBS resin of the present invention, 4-16 parts of maleic anhydride grafted material, and 0-1 part of an auxiliary agent.

[0018] The TPEE composite material provided by the present invention has excellent interaction between the components by selecting appropriate mass fractions, thereby achieving good mechanical strength, low gloss and excellent fluidity of the TPEE composite material.

[0019] Specifically, the present invention chooses to add the SBS resin of the present invention to the TPEE resin. The two have excellent compatibility under the action of maleic anhydride grafts, and can effectively form a microscopic sea-island structure, thereby reducing the macroscopic glossiness; and the SBS resin of the present invention has a specific chain structure, which can interact with the TPEE resin and the compatibilizer, thereby improving the fluidity of the TPEE composite material and retaining the good mechanical strength of the TPEE composite material.

[0020] Based on the total mass of the TPEE composite material, the mass percentage of the TPEE resin is ≥54%.

[0021] Preferably, the mass percentage of the TPEE resin is 60-78% based on the total mass of the TPEE composite material.

[0022] For example, the mass fraction of the TPEE resin can be any point value or any two point range values between 58-82 parts, such as 60-80 parts, or 58 parts, 60 parts, 62 parts, 64 parts, 66 parts, 68 parts, 70 parts, 72 parts, 74 parts, 76 parts, 78 parts, 80 parts, 82 parts, etc.; the mass fraction of the SBS resin can be any point value or any two point range values between 8-32 parts, such as 10-30 parts, or 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, The content of the maleic anhydride grafted compound can be any value between 4 and 16 parts or any two-point range value, such as 5 to 15 parts, or 4 parts, 5 parts, 7 parts, 9 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, etc.; the content of the auxiliary agent can be any value between 0 and 1 part or any two-point range value, such as 0 part, 0.3 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1.0 part, etc.

[0023] The TPEE resin of the present invention can be purchased from the market or prepared by itself, wherein the homemade resin can be prepared by conventional homemade methods.

[0024] Preferably, during the preparation of the TPEE resin, the hard segment monomers may be terephthalic acid and butanediol, and the soft segment monomer may be butanediol.

[0025] Preferably, the preparation method of the TPEE resin comprises the following steps: mixing terephthalic acid (PTA), benzoic acid (BA), butanediol (BG) and tetramethylene glycol (PTMG), then adding n-butyl titanate and heating to react in a closed manner, reducing the pressure after the closed heating reaction is completed and continuing to heat the reaction, and cooling to room temperature after the reaction is completed to obtain TPEE resin.

[0026] Preferably, the molar ratio of terephthalic acid, benzoic acid, butanediol and tetrahydrofuran polyether is 1:(0.1-2):(1-2):(0.01-0.05).

[0027] Preferably, the mass percentage of n-butyl titanate is 0.01-0.03% based on the total mass of terephthalic acid, benzoic acid, butanediol and tetramethylene glycol.

[0028] Preferably, the temperature of the heated sealed reaction is 220-240° C., and the time is 2.5-3.5 hours.

[0029] Preferably, the temperature of the temperature-raising reaction is 245-255° C., and the time is 2.5-3.5 hours.

[0030] Preferably, the pressure reduction is to a pressure of 80-120 Pa.

[0031] It should be noted that the preparation of TPEE resins with different melt indexes can be achieved by adjusting the amount of benzoic acid added to the reaction raw materials.

[0032] Preferably, in the TPEE resin, the molar ratio of the hard segment (polybutylene terephthalate) to the soft segment (polytetramethylene ether) is 1:(0.85-0.95).

[0033] It should be noted that the molar ratio of the hard segment to the soft segment in the TPEE resin can be obtained by nuclear magnetic resonance spectroscopy.

[0034] As a preferred embodiment of the TPEE composite material of the present invention, the TPEE composite material comprises the following components in parts by mass: 65-72 parts of TPEE resin, 18-22 parts of the SBS resin of the present invention, 8-12 parts of maleic anhydride grafts, and 0-1 part of an auxiliary agent.

[0035] The present invention has found that the mass parts of the components will also affect the comprehensive performance of the product to a certain extent. When the mass parts of the components are further selected to be within the above range, the comprehensive performance of the obtained product is better.

[0036] As a preferred embodiment of the TPEE composite material of the present invention, the melt index of the TPEE resin at 230° C. / 2.16 kg is 90-140 g / 10 min.

[0037] It should be noted that the melt index of the TPEE resin is obtained by testing with reference to ISO 1133-1-2011, and the test conditions are 230° C. / 2.16 kg.

[0038] Illustratively, the melt index of the TPEE resin at 230°C / 2.16kg may be any point value or any two point range values between 90-140 g / 10min, for example, 100-130 g / 10min, or 90 g / 10min, 95 g / 10min, 100 g / 10min, 105 g / 10min, 110 g / 10min, 115 g / 10min, 120 g / 10min, 125 g / 10min, 130 g / 10min, 135 g / 10min, 140 g / 10min, etc.

[0039] As a preferred embodiment of the TPEE composite material of the present invention, the grafting rate of the maleic anhydride graft is 0.4-1.6%.

[0040] It should be noted that the grafting rate of the maleic anhydride graft is measured by titration. Specifically, the refined graft is accurately weighed, added to xylene, heated under reflux until completely dissolved, cooled, added with KOH-ethanol standard solution for neutralization, and then titrated with HCl-isopropanol standard solution until pink, and the consumed volume is recorded. The grafting rate is calculated using the calculation formula.

[0041] Exemplarily, the grafting rate of the maleic anhydride graft can be any point value or any two point range values between 0.4-1.6%, such as 0.5-1.5%, 0.5-1%, 1-1.5%, etc., or can be 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, etc.

[0042] Preferably, the grafting rate of the maleic anhydride graft is 0.8-1.2%.

[0043] The present invention has found that maleic anhydride grafts with different grafting rates have a certain impact on the compatibility of TPEE resin and SBS resin. When the grafting rate of the maleic anhydride graft is further selected to be 0.4-1.6%, especially 0.8-1.2%, the obtained product has higher mechanical strength, better fluidity and lower gloss level.

[0044] As a preferred embodiment of the TPEE composite material of the present invention, the maleic anhydride grafted material includes at least one of maleic anhydride grafted SEBS and maleic anhydride grafted PP.

[0045] As a preferred embodiment of the TPEE composite material of the present invention, the auxiliary agent includes a light stabilizer and an antioxidant.

[0046] Preferably, the light stabilizer includes hindered amine light stabilizers and triazine light stabilizers.

[0047] More preferably, in the light stabilizer, the mass ratio of the hindered amine light stabilizer to the triazine light stabilizer is 3:2.

[0048] Illustratively, the hindered amine light stabilizer includes at least one of light stabilizer 622, light stabilizer 944, light stabilizer 783, light stabilizer 3853, light stabilizer 292, and light stabilizer 123; the triazine light stabilizer includes at least one of UV-234, UV-236, and UV-237.

[0049] Illustratively, the antioxidant includes at least one of antioxidant 1010, antioxidant 1076, antioxidant 1790, antioxidant 168, antioxidant DLTP, and antioxidant 626.

[0050] In a fifth aspect of the present invention, the present invention provides a method for preparing the TPEE composite material, the preparation method comprising the following steps:

[0051] The dried raw materials are weighed, mixed and fed into a twin-screw extruder, and subjected to extrusion, strand drawing, cooling, pelletizing and drying to obtain a TPEE composite material.

[0052] As a preferred embodiment of the preparation method of the present invention, in the melt extrusion, the aspect ratio of the twin-screw extruder is ≥56:1, the screw speed is 400-500 r / min, and the temperature is 120-200°C.

[0053] In a sixth aspect of the present invention, the present invention provides the use of the TPEE composite material in the preparation of automobile injection-molded surface parts.

[0054] For example, the TPEE composite material is used to prepare the skin of automobile seats, automobile door panels, and instrument panels.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] The present invention provides an SBS resin that uses hydrogenated SBS resin as a raw material, selects 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and hydrogenated SBS resin to undergo a cross-linking reaction under the action of a specific cross-linking agent, and is supplemented with paraffin oil and lubricants in appropriate parts by mass. The resulting SBS resin has low fluidity and a unique chain structure. Therefore, when it is subsequently applied to the preparation of a TPEE composite material, it can form a microscopic sea-island structure with the TPEE resin under the action of a maleic anhydride graft, thereby reducing the macroscopic gloss of the TPEE composite material, improving its fluidity, and retaining the excellent mechanical strength of TPEE. In addition, the preparation methods of the SBS resin and TPEE resin provided by the present invention are simple to operate and are conducive to practical production applications. DETAILED DESCRIPTION

[0057] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0058] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0059] Hydrogenated SBS resin 1: ZL-Q5501, hydrogenation rate 40%, 20 wt% toluene solution viscosity 600 Pa·s, Zhongli Technology;

[0060] Hydrogenated SBS resin 2: ZL-Q5503, hydrogenation rate 60%, 20 wt% toluene solution viscosity 1000 Pa·s, Zhongli Technology;

[0061] TPEE resin 1: melt index 130g / 10min, homemade;

[0062] TPEE resin 2: melt index is 100g / 10min, homemade;

[0063] Maleic anhydride grafted compound 1: G622, maleic anhydride grafted SEBS, grafting rate 1.0%, Nengzhiguang;

[0064] Maleic anhydride grafted compound 2: G873, maleic anhydride grafted SEBS, grafting rate 0.5%, Nengzhiguang;

[0065] Maleic anhydride grafted compound 3: G531, maleic anhydride grafted SEBS, grafting rate 1.5%, Nengzhiguang;

[0066] Maleic anhydride grafted compound 4: AD-105, maleic anhydride grafted PP, grafting rate 0.8%, Bochen;

[0067] Paraffin oil: 500N, Formosa Plastics;

[0068] Lubricant: silicone, MB50-002, Dow Corning;

[0069] Light stabilizer: a mixture of light stabilizer 944 and light stabilizer UV-234 in a mass ratio of 3:2, where light stabilizer 944 and light stabilizer UV-234 are commercially available;

[0070] Antioxidant: Antioxidant 1010, commercially available.

[0071] The preparation method of TPEE resin 1 includes the following steps: preparing terephthalic acid (PTA), benzoic acid (BA), butanediol (BG), and tetramethylene glycol (PTMG, molar mass 2000 g / mol). PTA, BA, BG, and PTMG are placed in a reaction kettle at a molar ratio of 1:0.2:1.5:0.02. n-butyl titanate is added at a rate of 0.2% by weight of the raw materials. The temperature is raised to 230°C and the reaction is carried out in a sealed container for 3 hours. The pressure in the container is then reduced to 100 Pa, and the temperature is raised to 250°C for 3 hours. After the reaction is completed, the reaction is cooled to room temperature to yield TPEE resin 1.

[0072] The melt index of TPEE resin 2 was changed by adjusting the amount of BA added.

[0073] The light stabilizer, antioxidant, lubricant, trimethylallyl isocyanate, and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane used in the parallel experiments of the examples and comparative examples remained consistent.

[0074] Examples 1-4 and Comparative Examples 1-2

[0075] The present invention provides an SBS resin according to the embodiment and comparative example. The raw material content (parts by weight) of the SBS resin is shown in Table 1.

[0076] Table 1

[0077] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Hydrogenated SBS resin 1 80 80 80 80 80 Hydrogenated SBS resin 2 80 Trimethylallyl isocyanate 1 0.8 1.5 1 1 Dicumyl peroxide 1 2,5-Dimethyl-2,5-bis(tert-butylperoxy)hexane 0.8 1 0.5 0.8 0.8 Benzoyl peroxide 0.8 paraffin oil 20 15 25 20 20 20 lubricant 2 1 3 2 2 2

[0078] The preparation method of the SBS resin provided in Example 1 comprises the following steps: mixing hydrogenated SBS, trimethylallyl isocyanate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, and a lubricant, and adding the mixture to the main feed port of a twin-screw extruder; adding paraffin oil to the third section of the twin-screw extruder, melt-mixing, and extruding into pellets; wherein the twin-screw extruder has a screw length-to-diameter ratio of 56:1, a screw speed of 400 r / min, and the temperatures of each section are 80° C., 180° C., 200° C., 200° C., 200° C., 200° C., 200° C., and 220° C., respectively;

[0079] The preparation methods of the SBS resins provided in Examples 2-4 and Comparative Examples 1-2 are the same as those in Example 1.

[0080] The SBS resins prepared in Examples 1-4 were named SBS resins AD, and the SBS resins prepared in Comparative Examples 1-2 were named SBS resins ab.

[0081] Application Examples 1-10 and Comparative Application Examples 1-3

[0082] The application examples of the present invention and the comparative application examples provide a TPEE composite, and the component contents (parts by weight) of the TPEE composite are shown in Table 2-3;

[0083] Table 2

[0084] Application Example 1 Application Example 2 Application Example 3 Application Example 4 Application Example 5 Application Example 6 Application Example 7 TPEE resin 1 70 60 80 / 70 70 70 TPEE resin 2 / / / 70 / / / SBS Resin A 20 30 10 20 / / / SBS resin B / / / / 20 / / SBS Resin C / / / / / 20 / SBS resin D / / / / / / 20 Maleic anhydride grafted compound 1 10 5 15 10 10 10 10 Light stabilizers 0.3 0 0.3 0.3 0.3 0.3 0.3 antioxidants 0.3 0 0.3 0.3 0.3 0.3 0.3

[0085] Table 3

[0086] Application Example 8 Application Example 9 Application Example 10 Comparative Application Example 1 Comparative Application Example 2 Comparative Application Example 3 TPEE resin 1 70 70 70 70 70 70 SBS Resin A 20 20 20 / / / SBS resin a / / / 20 / / SBS resin b / / / / 20 / Hydrogenated SBS resin 1 / / / / / 20 Maleic anhydride grafted compound 1 / / / 10 10 10 Maleic anhydride grafted 2 10 / / / / / Maleic anhydride grafted compound 3 / 10 / / / / Maleic anhydride grafted 4 / / 10 / / / Light stabilizers 0.3 0.3 0.3 0.3 0.3 0.3 antioxidants 0.3 0.3 0.3 0.3 0.3 0.3

[0087] The preparation method of the TPEE composite material provided in Application Example 1 comprises the following steps: weighing the dried raw materials, mixing them, and feeding them into a twin-screw extruder; extruding, drawing, cooling, pelletizing, and drying to obtain the TPEE composite material; wherein the screw aspect ratio of the twin-screw extruder is 56:1, the screw speed is 450 r / min, and the temperatures of each section are 80°C, 180°C, 220°C, 220°C, 220°C, 220°C, 220°C, and 230°C, respectively;

[0088] The preparation methods of the TPEE composite materials provided in Application Examples 2-10 and Comparative Application Examples 1-3 are consistent with those in Application Example 1.

[0089] Effect Examples

[0090] The performance of the TPEE composite materials prepared in the effect verification application examples and comparative application examples of the present invention includes the following aspects:

[0091] 1. Melt index: Tested in accordance with ISO 1133-1-2011 standard method, under the test conditions of 230°C / 1.2kg; the melt index for injection molded skin parts should be ≥100g / 10min;

[0092] 2. Tensile strength test: Refer to ISO 37-2017 standard, test at 500mm / min, and meet the application requirements of injection molded skin parts. The tensile strength should be ≥6MPa;

[0093] 3. Glossiness test: Refer to ISO 2813-2014 standard test, examine the glossiness at 60° on a uniform plane, and meet the application requirements of injection molded surface parts. The glossiness must be less than 1.2;

[0094] The results are shown in Table 4;

[0095] Table 4

[0096]

[0097] As can be seen from Table 4, when the technical solution provided by the present invention is adopted, the obtained TPEE composite material has excellent fluidity and mechanical strength, and also has low gloss. Specifically, the melt index of the obtained TPEE composite material is above 102 g / 10 min, the tensile strength is above 7.2 MPa, and the gloss is below 1.1. In other words, the TPEE composite material prepared by the technical solution provided by the present invention meets the application requirements of injection molded skin parts.

[0098] It can be seen from Application Example 1, Application Examples 5-7 and Comparative Application Examples 1-3 that the type of SBS resin added to the TPEE composite material will affect the comprehensive performance of the product; when the raw material cross-linking agent prepared in the SBS resin used in Comparative Application Example 1 is not the type of the present invention, the gloss of the obtained TPEE composite material is too high; when the raw material prepared in the SBS resin used in Comparative Application Example 2 is not 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane in the present invention, the melt index and tensile strength of the obtained TPEE composite material are significantly reduced; when hydrogenated SBS is directly used in Comparative Application Example 3, the gloss of the obtained product is too high.

[0099] Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An SBS resin, characterized in that The SBS resin comprises the following raw materials in parts by mass: 80 parts of hydrogenated SBS resin, 0.8-1.5 parts of trimethylallyl isocyanate, 0.5-1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 15-25 parts of paraffin oil, and 1-3 parts of lubricant.

2. The SBS resin according to claim 1, characterized in that The viscosity of a 20 wt% toluene solution of the hydrogenated SBS resin is 500-1200 Pa·s.

3. The method for preparing the SBS resin according to claim 1 or 2, wherein: The preparation method comprises the following steps: mixing the components uniformly and then melting and extruding them to obtain SBS resin.

4. A TPEE composite material, characterized in that: The TPEE composite material includes the following components in parts by mass: 58-82 parts TPEE resin, 8-32 parts The SBS resin according to claim 1 or 2, 4-16 parts of maleic anhydride grafted material, and 0-1 part of an auxiliary agent.

5. The TPEE composite material according to claim 4, characterized in that The TPEE composite material includes the following components in parts by mass: 65-72 parts of TPEE resin, 18-22 parts of SBS resin as claimed in claim 1 or 2, 8-12 parts of maleic anhydride grafted material, and 0-1 part of auxiliary agent.

6. The TPEE composite material according to claim 4, characterized in that The TPEE resin has a melt index of 90-140 g / 10 min at 230° C. / 2.16 kg.

7. The TPEE composite material according to claim 4, characterized in that The grafting rate of the maleic anhydride grafted product is 0.4-1.6%.

8. The TPEE composite material according to claim 4, characterized in that The maleic anhydride grafted product includes at least one of maleic anhydride grafted SEBS and maleic anhydride grafted PP.

9. The method for preparing the TPEE composite material according to any one of claims 4 to 8, wherein: The preparation method comprises the following steps: weighing the dried raw materials, mixing them and feeding them into a twin-screw extruder, and performing extrusion, drawing, cooling, pelletizing and drying to obtain a TPEE composite material.

10. Use of the TPEE composite material according to any one of claims 4 to 8 in the preparation of automotive injection-molded surface parts.

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