A thermoplastic elastomer composition for thin-wall molding and preparation method thereof

Abstract

The present application relates to the technical field of compositions of polymer compounds, and specifically discloses a thermoplastic elastomer composition for thin-wall molding and a preparation method thereof. The thermoplastic elastomer composition is mainly made of the following raw materials: SEBS elastomer, modified PP resin, POE resin, scratch-resistant agent, lubricant, antistatic agent, anti-aging compounding agent, colorant; the modified PP resin is mainly made of the following raw materials: PP resin, organic peroxide, 4-hydroxybutyl acrylate glycidyl ether, diallyl isocyanurate, lubricant, antioxidant. The thermoplastic elastomer composition has the characteristics of good hardness, high tensile strength, high elongation at break, high tear strength, and high melt flow rate. It maintains good fluidity during thin-wall molding, is convenient for thin-wall molding, and meets market demand.

Description

Technical Field

[0001] The present application relates to the technical field of polymer compound compositions, and more specifically, to a thermoplastic elastomer composition for thin-wall molding and a preparation method thereof. Background Art

[0002] With the continuous development of science and technology, the automotive interior decoration industry has also made rapid progress. In the automotive interior decoration industry, it is often necessary to use skin materials, which mainly include genuine leather, artificial leather, and thermoplastic elastomer compositions. For thermoplastic elastomer compositions, it is a composition of polymer compounds, which has the characteristics of excellent elasticity, aging resistance, and oil resistance. It also has the advantages of high processing efficiency and high yield rate, and has been accepted and recognized by the market. Thermoplastic elastomer compositions in the prior art generally use SEBS elastomer as the matrix, and add antioxidants, lubricants, and colorants as auxiliary materials. After mixing, extrusion granulation, a thermoplastic elastomer composition is obtained, and then thin-wall molding is performed to obtain a skin material. However, the applicant found in actual processing that the thermoplastic elastomer composition obtained by the above method has a slightly poor melt flow rate, which is not conducive to the flow during the thin-wall molding process. Summary of the invention

[0003] In order to increase the melt flow rate of a thermoplastic elastomer composition, the present application provides a thermoplastic elastomer composition for thin-wall molding and a preparation method thereof.

[0004] In a first aspect, the present application provides a thermoplastic elastomer composition for thin-wall molding, which adopts the following technical solution:

[0005] A thermoplastic elastomer composition for thin-wall molding, the thermoplastic elastomer composition is mainly made of the following raw materials in parts by weight: 50-70 parts of SEBS elastomer, 10-20 parts of modified PP resin, 3-9 parts of POE resin, 5-10 parts of scratch resistant agent, 0.1-0.5 parts of lubricant, 0.2-0.5 parts of antistatic agent, 0.5-1.5 parts of anti-aging compounding agent, and 0.5-3 parts of colorant;

[0006] The modified PP resin is mainly made of the following raw materials in parts by weight: 100 parts of PP resin, 0.4-0.8 parts of organic peroxide, 0.01-0.05 parts of 4-hydroxybutyl acrylate glycidyl ether, 0.01-0.05 parts of diallyl isocyanurate, 0.2-0.4 parts of lubricant, and 0.05-0.2 parts of antioxidant.

[0007] The thermoplastic elastomer composition for thin-wall molding of the present application has a Shore hardness of 80±5A, a tensile strength ≥7.5MPa, an elongation at break ≥566%, a tear strength ≥31.5kN / m, and a melt flow rate ≥57g / 10min at 190°C and 2.16kg through the mutual coordination of raw materials. It exhibits the characteristics of good hardness, high tensile strength, high elongation at break, high tear strength, and high melt flow rate, which is beneficial for the molten thermoplastic elastomer composition to maintain good fluidity during the thin-wall molding process, facilitates thin-wall molding, and is suitable for thin-wall molded products for automotive interiors, such as replacing genuine leather, artificial leather, etc., to meet market demand.

[0008] The thermoplastic elastomer composition of the present application adds PP resin to the raw materials, and uses organic peroxide, 4-hydroxybutyl acrylate glycidyl ether, and diallyl isocyanurate to treat the PP resin. The organic peroxide can release free radicals, break the molecular chain of the PP resin, increase the melt flow rate, and use the mutual cooperation between them to make the thermoplastic elastomer composition show better comprehensive performance.

[0009] Optionally, the organic peroxide is one or more of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, 3,5,5-trimethylhexanoic acid tert-butyl peroxide, tert-butyl peroxyacetate, didodecanoyl peroxide, and tert-butyl peroxyisopropyl formate.

[0010] By adopting the technical solution, the organic peroxide is optimized, which facilitates the selection of the organic peroxide.

[0011] Optionally, the melt flow rate of the PP resin at 230° C. and 2.16 kg is 10-100 g / 10 min.

[0012] By adopting the above technical solution, the melt flow rate of the PP resin is optimized, the stability of the source of the PP resin is ensured, the modification of the PP resin is facilitated, the use effect of the modified PP resin is improved, and the mechanical properties and melt flow rate of the thermoplastic elastomer composition are enhanced. In multiple embodiments, the melt flow rate of the PP resin at 230°C and 2.16kg is 50g / 10min, and the melt flow rate can also be set to 10g / 10min, 20g / 10min, 30g / 10min, 40g / 10min, 60g / 10min, 70g / 10min, 80g / 10min, 90g / 10min, 100g / 10min as needed, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0013] Optionally, the modified PP resin is prepared by the following method:

[0014] PP resin, organic peroxide, 4-hydroxybutyl acrylate glycidyl ether, diallyl isocyanurate, lubricant and antioxidant are mixed, melt-extruded at a temperature of 160-190° C., and granulated to obtain modified PP resin.

[0015] By adopting the above technical solution, the preparation of modified PP resin is facilitated. In multiple embodiments, the temperature of melt extrusion is 170°C, and the temperature can also be set to 160°C, 165°C, 175°C, 180°C, 185°C, 190°C as needed, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0016] Optionally, in the preparation method of the modified PP resin, a twin-screw extruder is used for melt extrusion, and the screw speed is 400-500 rpm. In multiple embodiments, the screw speed is 500 rpm, and the speed can also be set to 400 rpm, 420 rpm, 450 rpm, 480 rpm as needed, but is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0017] Optionally, the SEBS elastomer is one or more of SEBS elastomer Kraton G1653, SEBS elastomer Kraton G1643, and SEBS elastomer YH-505;

[0018] The POE resin is one or more of POE resin Vistamaxx 3000, POE resin 6102FL, POE resin 8480, and POE resin 8200.

[0019] By adopting the above technical solution, SEBS elastomer and POE resin are optimized, which facilitates the selection of SEBS elastomer and POE resin, and can also stabilize the source, thereby ensuring the quality and use effect of the thermoplastic elastomer composition.

[0020] Optionally, the SEBS elastomer is SEBS elastomer Kraton G1653 and SEBS elastomer Kraton G1643, and the weight ratio of SEBS elastomer Kraton G1653 and SEBS elastomer Kraton G1643 is (1-3): (1-3). In multiple embodiments, the weight ratio of SEBS elastomer Kraton G1653 and SEBS elastomer Kraton G1643 is 1:2, and the weight ratio can also be set to 1:1, 1:3, 2:1, 2:3, 3:1, 3:2 as needed, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0021] Optionally, the anti-scratch agent is one or more of the anti-scratch agent HG-650, the anti-scratch agent NM100, the anti-scratch agent IrgasurfSR100B, and the anti-scratch agent MERAntiScratch100;

[0022] The antistatic agent is one or more of antistatic agent Atmer 129, antistatic agent E-XCB, antistatic agent SAS93, and antistatic agent AE-2;

[0023] The colorant is one or more of carbon black, silicon dioxide, titanium dioxide, ferric oxide, and chromium oxide.

[0024] By adopting the above technical solution, the scratch resistant agent, antistatic agent and colorant are optimized, which is convenient for the selection of scratch resistant agent, antistatic agent and colorant. In addition, the scratch resistant agent can improve the scratch resistance and reduce the generation of micro cracks and wear. The antistatic agent can reduce the surface resistivity, reduce the accumulation of static electricity and reduce the adhesion of dust. The colorant plays a good coloring role, improves the appearance quality, improves the visual effect and adapts to different color requirements.

[0025] Optionally, the lubricant is one or more of erucamide, ethylene bisstearamide, zinc stearate, and calcium stearate.

[0026] By adopting the above technical solution, the lubricant is optimized and the selection of the lubricant is convenient. The lubricant can improve the processability of the thermoplastic elastomer composition and reduce wear.

[0027] Optionally, the antioxidant is one or more of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, β-(3.5-di-tert-butyl, 4-hydroxyphenyl) propionate octadecyl alcohol ester, tris(2,4-di-tert-butyl)phenyl phosphite, and bis(2,4-di-tert-butylphenol) pentaerythritol diphosphite.

[0028] By adopting the above technical solution, the antioxidant is optimized and the selection of the antioxidant is facilitated.

[0029] Optionally, the antioxidant is two kinds of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester and tris(2,4-di-tert-butyl)phenyl phosphite, and the weight ratio of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester and tris(2,4-di-tert-butyl)phenyl phosphite is (1-3):(1-3). In multiple embodiments, the weight ratio of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester and tris(2,4-di-tert-butyl)phenyl phosphite is 1:2, and the weight ratio can also be set to 1:1, 1:3, 2:1, 2:3, 3:1, 3:2 as needed, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0030] Optionally, the anti-aging compound comprises an antioxidant and an anti-UV agent, and the weight ratio of the antioxidant to the anti-UV agent is (1-3):(1-3).

[0031] By adopting the above technical solution, antioxidants and anti-UV agents are used as anti-aging compounding agents, and the two cooperate with each other to reduce the degradation of the thermoplastic elastomer composition under high temperature and ultraviolet irradiation, increase the stability in use, and extend the service life. In multiple embodiments, the weight ratio of antioxidants and anti-UV agents is 2:1, and the weight ratio can also be set to 1:1, 1:2, 1:3, 2:3, 3:1, 3:2 as needed, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0032] Optionally, the anti-UV agent is one or more of 2-hydroxy-4-octyloxybenzophenone, 5-benzoyl-4-hydroxy-2-methoxybenzenesulfonic acid, 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, and 2,(2-hydroxy-5-methylphenyl)benzotriazole.

[0033] By adopting the above technical solution, the anti-UV agent is optimized, which facilitates the selection of the anti-UV agent. Moreover, 2-hydroxy-4-n-octyloxybenzophenone, 5-benzoyl-4-hydroxy-2-methoxybenzenesulfonic acid, 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, and 2, (2-hydroxy-5-methylphenyl) benzotriazole can effectively reduce the aging effect of ultraviolet rays on the thermoplastic elastomer composition and extend the service life.

[0034] Optionally, the anti-UV agent is 2-hydroxy-4-octyloxybenzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, and the weight ratio of 2-hydroxy-4-octyloxybenzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole is (1-3):(1-3). In multiple embodiments, the weight ratio of 2-hydroxy-4-octyloxybenzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole is 1:1, and the weight ratio can also be set to 1:2, 1:3, 2:1, 2:3, 3:1, 3:2 as needed, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0035] In a second aspect, the present application provides a method for preparing a thermoplastic elastomer composition for thin-wall molding, which adopts the following technical solution:

[0036] A method for preparing a thermoplastic elastomer composition for thin-wall molding mainly comprises the following steps:

[0037] SEBS elastomer, modified PP resin, POE resin, scratch resistance agent, lubricant, antistatic agent, anti-aging compounding agent and colorant are mixed, melt-extruded and granulated at a temperature of 160-180° C. to obtain a thermoplastic elastomer composition.

[0038] By adopting the above technical solution, the preparation of the thermoplastic elastomer composition is facilitated. In multiple embodiments, the temperature of melt extrusion is 170°C, and the temperature can also be set to 160°C, 165°C, 175°C, 180°C as required, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0039] Optionally, in the method for preparing the thermoplastic elastomer composition, a twin-screw extruder is used for melt extrusion, and the screw speed is 400-600 rpm. In multiple embodiments, the screw speed is 500 rpm, and the speed can also be set to 400 rpm, 420 rpm, 450 rpm, 480 rpm, 520 rpm, 550 rpm, 580 rpm, 600 rpm as needed, but is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0040] In summary, this application has at least the following beneficial effects:

[0041] The thermoplastic elastomer composition for thin-wall molding of the present application is based on SEBS elastomer and POE resin, on which modified PP resin is added, and the PP resin is treated with organic peroxide, 4-hydroxybutyl acrylate glycidyl ether, and diallyl isocyanurate, and the tensile strength, tear strength and melt flow rate are improved by mutual cooperation. The Shore hardness of the thermoplastic elastomer composition is 80±5A, the tensile strength is ≥7.5MPa, the elongation at break is ≥566%, the tear strength is ≥31.5kN / m, and the melt flow rate at 190°C and 2.16kg is ≥57g / 10min, which is conducive to the molten thermoplastic elastomer composition to maintain good fluidity during thin-wall molding, facilitate thin-wall molding, and meet market demand. DETAILED DESCRIPTION

[0042] In order to make the present application easier to understand, the present application will be further described in detail below in conjunction with the examples, which are merely illustrative and are not intended to limit the scope of application of the present application. The raw materials or components used in the present application can be obtained through commercial routes or conventional methods unless otherwise specified.

[0043] Preparation Example

[0044] Table 1 Amount of each raw material used in modified PP resin (unit: kg)

[0045]

[0046] Preparation Example 1

[0047] A modified PP resin, the raw materials and raw material ratios of which are shown in Table 1.

[0048] Among them, the PP resin is Formosa Plastics PP resin 1450T, and the melt flow rate of the PP resin at 230°C and 2.16kg is 50g / 10min; the organic peroxide is didodecanol peroxide; the lubricant is calcium stearate; the antioxidants are two types of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tris(2,4-di-tert-butyl)phenyl phosphite, and the weight ratio of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tris(2,4-di-tert-butyl)phenyl phosphite is 1:2.

[0049] A method for preparing a modified PP resin mainly comprises the following steps:

[0050] Add PP resin, organic peroxide, 4-hydroxybutyl acrylate glycidyl ether, diallyl isocyanurate, lubricant, and antioxidant into a mixer and stir for 5 minutes. Then feed into a twin-screw extruder, melt extrude at a temperature of 170°C and a screw speed of 500 rpm, and granulate to obtain a modified PP resin.

[0051] Preparation Example 2-3

[0052] A modified PP resin, which differs from Preparation Example 1 in that the raw material ratio of the modified PP resin is different, and the raw material ratio of the modified PP resin of Preparation Examples 2-3 is shown in Table 1.

[0053] Example

[0054] Table 2 Amount of each raw material used in the thermoplastic elastomer composition (unit: kg)

[0055]

[0056] Example 1

[0057] A thermoplastic elastomer composition for thin-wall molding, the raw materials and raw material ratios of which are shown in Table 2.

[0058] Among them, the SEBS elastomers are SEBS elastomer Kraton G1653 and SEBS elastomer Kraton G1643, and the weight ratio of SEBS elastomer Kraton G1653 to SEBS elastomer Kraton G1643 is 1:2; the modified PP resin is prepared by the method of Preparation Example 1; the POE resin is POE resin Vistamaxx 3000; the scratch resistant agent is Jiahua scratch resistant agent HG-650; the lubricant is erucic acid amide; the antistatic agent is antistatic agent Atmer 129; The anti-aging compound agent is an antioxidant and an anti-UV agent, and the weight ratio of the antioxidant and the anti-UV agent is 2:1. The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tris(2,4-di-tert-butyl)phenyl phosphite, and the weight ratio of the tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tris(2,4-di-tert-butyl)phenyl phosphite is 1:2. The UV agents are 2-hydroxy-4-octyloxybenzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, and the weight ratio of 2-hydroxy-4-octyloxybenzophenone and 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole is 1:1; the colorant is carbon black, the average particle size of the carbon black is 18μm, and it is selected from Shandong Wanhua Tianhe New Materials Co., Ltd.

[0059] A method for preparing a thermoplastic elastomer composition for thin-wall molding mainly comprises the following steps:

[0060] Add SEBS elastomer, modified PP resin, POE resin, scratch resistance agent, lubricant, antistatic agent, anti-aging compounding agent and colorant into a mixer and stir for 5 minutes. Then feed into a twin-screw extruder and melt extrude at a temperature of 170°C and a screw speed of 500 rpm to obtain a thermoplastic elastomer composition.

[0061] Embodiment 2-5

[0062] A thermoplastic elastomer composition for thin-wall molding, which differs from Example 1 in that the raw material ratio of the thermoplastic elastomer composition is different, and the raw material ratios of the thermoplastic elastomer compositions of Examples 2-5 are shown in Table 2.

[0063] Example 6

[0064] A thermoplastic elastomer composition for thin-wall molding, which differs from Example 2 in that the source of the modified PP resin in the raw materials of the thermoplastic elastomer composition is different, and the modified PP resin is prepared by the method of Preparation Example 2.

[0065] Example 7

[0066] A thermoplastic elastomer composition for thin-wall molding, which differs from Example 2 in that the source of the modified PP resin in the raw materials of the thermoplastic elastomer composition is different, and the modified PP resin is prepared by the method of Preparation Example 3.

[0067] Comparative Example

[0068] Comparative Example 1

[0069] A thermoplastic elastomer composition for thin-wall molding, which is different from Example 2 in that no modified PP resin is added to the raw materials of the thermoplastic elastomer composition.

[0070] Comparative Example 2

[0071] A thermoplastic elastomer composition for thin-wall molding, which differs from Example 2 in that an equal amount of PP resin is used to replace the modified PP resin in the raw materials of the thermoplastic elastomer composition.

[0072] Comparative Example 3

[0073] A thermoplastic elastomer composition for thin-wall molding, which differs from Example 2 in that 4-hydroxybutyl acrylate glycidyl ether and diallyl isocyanurate are not added to the raw materials of the thermoplastic elastomer composition and the raw materials of the modified PP resin.

[0074] Comparative Example 4

[0075] A thermoplastic elastomer composition for thin-wall molding, which differs from Example 2 in that in the raw materials of the thermoplastic elastomer composition and in the raw materials of the modified PP resin, an equal amount of 4-hydroxybutyl acrylate glycidyl ether is used to replace diallyl isocyanurate.

[0076] Comparative Example 5

[0077] A thermoplastic elastomer composition for thin-wall molding, which differs from Example 2 in that, in the raw materials of the thermoplastic elastomer composition, in the raw materials of the modified PP resin, 4-hydroxybutyl acrylate glycidyl ether is replaced by an equal amount of diallyl isocyanurate.

[0078] Performance Testing

[0079] The thermoplastic elastomer compositions obtained in Examples 1-7 and Comparative Examples 1-5 were respectively taken, and the following performance tests were performed on the thermoplastic elastomer compositions. The test results are shown in Table 3.

[0080] Wherein, the Shore A hardness of the thermoplastic elastomer composition is tested according to ISO 868-2003.

[0081] The tensile strength and elongation at break of the thermoplastic elastomer composition were tested according to Type I in ISO 37-2017 at a test speed of 500 mm / min.

[0082] The tear strength of the thermoplastic elastomer composition was tested according to Type B in ISO 34-1-2015 at a test speed of 500 mm / min.

[0083] According to ISO 1133-1-2011, the melt flow rate of the thermoplastic elastomer composition at 190° C. and 2.16 kg was measured.

[0084] Table 3 Test results

[0085]

[0086] As can be seen from Table 3, the thermoplastic elastomer composition of the present application has a good Shore hardness of 80±5A, showing good hardness. It also has high tensile strength, elongation at break and tear strength, with a tensile strength of 7.5-8.5MPa, an elongation at break of 566-572%, and a tear strength of 31.5-32.6kN / m, showing the characteristics of high tensile strength, high elongation at break, and high tear strength. At the same time, it also has a high melt flow rate, with a melt flow rate of 57-63g / 10min at 190°C and 2.16kg, showing the characteristics of a high melt flow rate. The thermoplastic elastomer composition of the present application has good comprehensive performance and meets market demand.

[0087] Comparative Examples 1-2 are compared, and Comparative Example 1 is used as the basis. Compared with Comparative Example 1, Comparative Example 2 adds PP resin to the raw material of the thermoplastic elastomer composition. It can be seen that adding PP resin to the raw material of the thermoplastic elastomer composition can make it show better comprehensive performance. Combined with Example 1, compared with Comparative Example 1, Example 1 adds modified PP resin to the raw material of the thermoplastic elastomer composition. It can be seen that modifying the PP resin can further improve the tensile strength, tear strength and melt flow rate, and make the modified PP resin show better use effect.

[0088] Comparative Examples 3-5 and Example 1 are compared. The modified PP resin of Comparative Example 3 is obtained by treating the PP resin with an organic peroxide; the modified PP resin of Comparative Example 4 is obtained by treating the PP resin with an organic peroxide and 4-hydroxybutyl acrylate glycidyl ether; the modified PP resin of Comparative Example 5 is obtained by treating the PP resin with an organic peroxide and diallyl isocyanurate; the modified PP resin of Example 1 is obtained by treating the PP resin with an organic peroxide, 4-hydroxybutyl acrylate glycidyl ether, and diallyl isocyanurate. It can be seen that the addition of organic peroxide, 4-hydroxybutyl acrylate glycidyl ether, and diallyl isocyanurate is beneficial to enhancing the tensile strength and tear strength, so that the thermoplastic elastomer composition exhibits better comprehensive performance.

[0089] It should be noted that the embodiments described above are only used to explain the present application and do not constitute any limitation to the present application. The present application is described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present application may be modified as specified within the scope of the claims of the present application, and the present invention may be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and embodiments, it does not mean that the present application is limited to the specific examples disclosed therein. On the contrary, the present application can be extended to all other methods and applications with the same functions.

Claims

1. A thermoplastic elastomer composition for thin-wall molding, characterized in that: The thermoplastic elastomer composition is mainly made of the following raw materials in parts by weight: 50-70 parts of SEBS elastomer, 10-20 parts of modified PP resin, 3-9 parts of POE resin, 5-10 parts of scratch resistant agent, 0.1-0.5 parts of lubricant, 0.2-0.5 parts of antistatic agent, 0.5-1.5 parts of anti-aging compounding agent, and 0.5-3 parts of colorant; The modified PP resin is mainly made of the following raw materials in parts by weight: 100 parts of PP resin, 0.4-0.8 parts of organic peroxide, 0.01-0.05 parts of 4-hydroxybutyl acrylate glycidyl ether, 0.01-0.05 parts of diallyl isocyanurate, 0.2-0.4 parts of lubricant, and 0.05-0.2 parts of antioxidant; The melt flow rate of the PP resin at 230° C. and 2.16 kg is 10-100 g / 10 min; the melt flow rate of the thermoplastic elastomer composition for thin-wall molding at 190° C. and 2.16 kg is ≥57 g / 10 min.

2. A thermoplastic elastomer composition for thin-wall molding according to claim 1, characterized in that: The organic peroxide is one or more of 2,5-dimethyl-2,5-di-tert-butyl peroxyhexane, 3,5,5-trimethylhexanoic acid tert-butyl peroxide, tert-butyl peroxyacetate, didodecanoyl peroxide, and tert-butyl peroxyisopropyl formate.

3. The thermoplastic elastomer composition for thin-wall molding according to claim 1, characterized in that: The modified PP resin is prepared by the following method: PP resin, organic peroxide, 4-hydroxybutyl acrylate glycidyl ether, diallyl isocyanurate, lubricant and antioxidant are mixed, melt-extruded at a temperature of 160-190° C., and granulated to obtain modified PP resin.

4. The thermoplastic elastomer composition for thin-wall molding according to claim 1, characterized in that: The colorant is one or more of carbon black, silicon dioxide, titanium dioxide, ferric oxide, and chromium oxide.

5. The thermoplastic elastomer composition for thin-wall molding according to claim 1, characterized in that: The lubricant is one or more of erucamide, ethylene bis stearamide, zinc stearate and calcium stearate.

6. The thermoplastic elastomer composition for thin-wall molding according to claim 1, characterized in that: The antioxidant is one or more of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, β-(3.5-di-tert-butyl, 4-hydroxyphenyl) propionate octadecyl alcohol ester, tris(2,4-di-tert-butyl)phenyl phosphite, and bis(2,4-di-tert-butylphenol) pentaerythritol diphosphite.

7. The thermoplastic elastomer composition for thin-wall molding according to claim 1, characterized in that: The anti-aging compound comprises two types of agents, an antioxidant and an anti-UV agent, and the weight ratio of the antioxidant to the anti-UV agent is (1-3):(1-3).

8. A method for preparing a thermoplastic elastomer composition for thin-wall molding as claimed in any one of claims 1 to 7, characterized in that: The main steps are as follows: SEBS elastomer, modified PP resin, POE resin, scratch resistance agent, lubricant, antistatic agent, anti-aging compounding agent and colorant are mixed, melt-extruded and granulated at a temperature of 160-180° C. to obtain a thermoplastic elastomer composition.

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