PA / ASA composition as well as preparation method and application thereof

Abstract

The invention discloses a PA / ASA composition as well as a preparation method and application thereof. The PA / ASA composition comprises the following components in parts by weight: 48-72 parts of PA resin; 28 to 42 parts of ASA rubber powder; 1-10 parts of a compatilizer; 1-10 parts of a modified thermoplastic elastomer; wherein the compatilizer comprises a styrene-acrylonitrile-maleic anhydride copolymer, and the content of maleic anhydride in the compatilizer is not higher than 5wt%; the modified thermoplastic elastomer comprises an epoxy group and / or maleic anhydride. According to the invention, the terpolymer with specific maleic anhydride content and the modified thermoplastic elastomer are added into a PA / ASA composition system, so that the prepared PA / ASA composition has better appearance effect and toughness.

Description

Technical Field

[0001] This invention relates to the field of engineering plastics technology, and more specifically, to a PA / ASA composition, its preparation method, and its application. Background Technology

[0002] Nylon (PA), a semi-crystalline engineering plastic, possesses excellent mechanical strength, chemical resistance, and processing flowability, making it widely used in automotive parts, electronics, and other fields. However, its inherent poor weather resistance and low notched impact strength under wet conditions limit its application in outdoor or demanding environments. Furthermore, nylon is sensitive to notches, with a notched impact strength typically below 5 kJ / m², exhibiting significant brittleness, especially in low-temperature or dry environments.

[0003] Acrylonitrile-styrene-acrylate copolymer (ASA) has excellent weather resistance, high notched impact strength and good surface gloss, making it suitable for paint-free exterior parts, such as automotive exteriors and consumer electronics housings.

[0004] In theory, the combination of PA and ASA can complement each other's advantages. However, since PA is a polar material and ASA is non-polar, their compatibility is extremely poor. Simple blending easily leads to phase separation, which not only fails to improve toughness but may also further reduce impact strength due to interface defects. In addition, when used in combination, flow marks or weld lines are prone to appear. More seriously, due to phase separation and elastomer deformation, especially when the amount of ASA powder is large, defects such as tiger stripe patterns often appear on the surface of the product, which greatly limits the application of PA / ASA alloys in scenarios with high appearance requirements. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art in which PA / ASA alloy materials are prone to tiger-skin pattern appearance and reduced impact strength, and to provide a PA / ASA composition.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned PA / ASA composition.

[0007] Another object of the present invention is to provide the application of the above-described PA / ASA composition.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A PA / ASA composition comprising the following components in parts by weight: 48-72 parts of PA resin; 28-42 parts of ASA adhesive powder; 1-10 parts compatibilizer; 1-10 parts of modified thermoplastic elastomer; The compatibilizer comprises a styrene-acrylonitrile-maleic anhydride copolymer, and the maleic anhydride content in the compatibilizer is not higher than 5 wt%; the modified thermoplastic elastomer contains epoxy groups and / or maleic anhydride.

[0009] This invention provides a PA / ASA composition. Adding ASA powder to PA resin allows the composition to possess the properties of both resins while also providing a toughening effect. When the spacing between ASA powder particles is less than the critical toughening spacing, the ASA powder induces shear yielding and creasing in the PA resin matrix, causing a brittle-tough transition. However, excessive ASA powder leads to excessively small particle spacing, increasing the probability of continuous phase formation and inducing the tiger-skin pattern problem. The applicant discovered that introducing a certain amount of modified thermoplastic elastomer can effectively control the ASA powder spacing near the critical toughening spacing, achieving a toughening effect while reducing the probability of ASA powder forming a continuous phase. Furthermore, the modified thermoplastic elastomer dispersed around the ASA powder forms a core-shell-core structure, further improving the system's toughness. Simultaneously, combining a terpolymer as a compatibilizer can effectively improve the tiger-skin pattern problem in the PA / ASA composition.

[0010] It should be noted that the maleic anhydride content in the compatibilizer described in this invention is not higher than 5 wt%, for example, but not limited to, not higher than 5 wt%, 4.8 wt%, 4.5 wt%, 4.2 wt%, 4 wt%, 3.8 wt%, 3.5 wt%, 3.2 wt%, 3 wt%, 2.8 wt%, 2.5 wt%, 2.2 wt%, 2 wt%, 1.8 wt%, 1.5 wt%, 1.2 wt%, 1 wt%, 0.8 wt%, 0.5 wt%, or 0.2 wt%, etc., as well as the specific values ​​between the above values. Due to space limitations and for the sake of brevity, the specific values ​​included in the range are not exhaustively listed in this invention.

[0011] Furthermore, the maleic anhydride content in the compatibilizer is 0.5~4wt%.

[0012] Furthermore, the compatibilizer contains 1.5 to 3.5 wt% maleic anhydride.

[0013] Furthermore, the compatibilizer contains 2-3 wt% maleic anhydride.

[0014] Specifically, the method for determining the maleic anhydride content in the compatibilizer is a chemical titration method using standard NaOH solution titration and phenolphthalein as an indicator.

[0015] It should be noted that the compatibilizer described in this invention is 1 to 10 parts, for example, but not limited to 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, or 10 parts, etc., and the specific point values ​​between the above point values ​​are not exhaustively listed in this invention due to space limitations and for the sake of brevity.

[0016] It should be noted that the compatibilizer described in this invention can be homemade or commercially available. The compatibilizer can be a styrene-acrylonitrile-maleic anhydride random copolymer and / or a maleic anhydride-grafted styrene-acrylonitrile copolymer.

[0017] Specifically, the compatibilizer can be prepared by the following method: SAN resin, maleic anhydride (MAH) monomer, and dicumyl peroxide (DCP) are premixed uniformly in a high-speed mixer at a certain mass ratio; the mixture is placed in a twin-screw extruder and melt-blended at 180°C, and extruded at a screw speed of 250 rpm to obtain maleic anhydride-grafted styrene-acrylonitrile copolymer; the amount of DCP added is 0.1 wt% of SAN resin, and the feeding ratio of maleic anhydride to SAN resin is (1~8):100.

[0018] Specifically, the compatibilizer can also be prepared by the following method: SAN resin, maleic anhydride (MAH) monomer, and azobisisobutyronitrile (AIBN) were dissolved in xylene solvent at a certain mass ratio. Under a nitrogen atmosphere, the mixture was mechanically stirred and refluxed in an oil bath at 110°C for 4 hours. After the reaction, the reaction solution was cooled to room temperature and slowly poured into excess ethanol with stirring to precipitate the product. The precipitate was collected by filtration and washed three times with fresh ethanol to remove residual solvent and unreacted monomers. Finally, the product was dried in a vacuum drying oven at 50°C to constant weight to obtain maleic anhydride-grafted styrene-acrylonitrile copolymer. The concentration of SAN in xylene was 0.1 g / mL, the amount of AIBN added was 0.5 wt% of the SAN resin, and the feeding ratio of maleic anhydride to SAN resin was (3~10):100. It should be noted that in the PA / ASA composition described in this invention, the content of PA resin is preferably not less than 40 wt%.

[0019] Furthermore, in the PA / ASA composition of the present invention, the content of ASA adhesive powder is preferably not higher than 40 wt%, and more preferably, the content of ASA adhesive powder is 27~39 wt%.

[0020] Furthermore, in the PA / ASA composition of the present invention, the content of modified thermoplastic elastomer is preferably 0.9~10wt%.

[0021] Furthermore, in the PA / ASA composition of the present invention, the compatibilizer content is preferably 0.9~10wt%. Furthermore, in the PA / ASA composition of the present invention, the total amount of ASA powder and modified thermoplastic elastomer in the composition is preferably 35-42 wt%.

[0022] Furthermore, the modified thermoplastic elastomer comprises a thermoplastic elastomer grafted with GMA (glycidyl methacrylate) and / or a maleic anhydride grafted with a thermoplastic elastomer, wherein the content of GMA (glycidyl methacrylate) or maleic anhydride in the modified thermoplastic elastomer is 0.2~2.0wt%, for example, it can be 1.0~2.0wt%.

[0023] Specifically, the thermoplastic elastomer includes styrene-based elastomers and / or polyolefin-based elastomers.

[0024] Furthermore, the maleic anhydride-grafted styrene elastomer includes maleic anhydride-grafted SEBS and / or maleic anhydride-grafted SBS; the maleic anhydride-grafted polyolefin elastomer includes maleic anhydride-grafted POE and / or maleic anhydride-grafted EPDM.

[0025] Furthermore, the maleic anhydride content in the thermoplastic elastomer grafted with maleic anhydride is 0.2~1.0 wt%.

[0026] Further, the maleic anhydride accounts for 0.03 to 0.25 wt% of the PA / ASA composition.

[0027] Specifically, the method for determining the maleic anhydride content in the thermoplastic elastomer grafted with maleic anhydride is a chemical titration method using standard NaOH solution titration and phenolphthalein as an indicator.

[0028] Furthermore, the styrene-based elastomer grafted GMA includes SEBS-grafted GMA and / or SBS-grafted GMA; the polyolefin-based elastomer grafted GMA includes POE-grafted GMA and / or EPDM-grafted GMA.

[0029] Furthermore, the GMA content in the thermoplastic elastomer grafted with GMA is not less than 1 wt%; preferably 1 to 2 wt%.

[0030] Specifically, the GMA content in the thermoplastic elastomer grafted with GMA is determined by Fourier transform infrared spectroscopy. Further, the relative viscosity of the PA resin is 2~2.6.

[0031] It should be noted that the test standard for the relative viscosity of the PA resin described in this invention is ASTM D789-2015.

[0032] Specifically, the relative viscosity was measured at a concentration of 0.01 g / mL.

[0033] Furthermore, the PA resin is a mixture of PA resin A with a relative viscosity of 1.5 to 2 and PA resin B with a relative viscosity of 2.6 to 3.

[0034] Furthermore, the mass ratio of resin A to resin B is 1:(0.8~1.25).

[0035] Furthermore, the PA resin includes one or more of aliphatic PA resin and aromatic PA resin.

[0036] Specifically, the aliphatic PA resin is one or more of PA66, PA610, PA612, PA1010, PA1012, PA1212, PA6, PA7, PA11, PA12, and PA PACM12.

[0037] The aromatic PA resin is one or more of PA6T, PA9T, PA10T, PA11T, PA12T, PA13T, PA6T / 6I, PA6T / 6I / 66, PA6I, PA6I / 6T, PA10T / 66, PA10T / 1010, PA10T / 10I, PPTA, MPDI, PARA, and PA6-3-T.

[0038] Furthermore, the acrylate rubber content in the ASA rubber powder is 40~70wt%.

[0039] Furthermore, the particle size distribution of the ASA adhesive powder is 100~500nm, preferably 100~300nm.

[0040] Specifically, the particle size distribution of the ASA adhesive powder was determined using a Malvern laser particle size analyzer.

[0041] It should be noted that, without affecting the tiger-skin effect and impact performance of the PA / ASA composition, the PA / ASA composition of the present invention also includes 0.1 to 10 parts of additives.

[0042] Specifically, the additives include one or more of flame retardants, antioxidants, abrasion retardants, or light stabilizers.

[0043] The flame retardant described in this invention can be a commonly used flame retardant, such as, but not limited to, one or more of bromine-based flame retardants, phosphorus-based flame retardants, nitrogen-based flame retardants, or inorganic flame retardants.

[0044] Specifically, the brominated flame retardant includes one or more of the following: decabromodiphenyl ethane, decabromodiphenyl ether, brominated styrene, tris(tribromonepentyl) phosphate, tetrabromobisphenol A-bis(2,3-dibromopropyl) ether, tris(2,3-dibromopropyl)isocyanurate, tetrabromobisphenol S-bis(2,3-dibromopropyl) ether, or melamine hydrobromide.

[0045] Specifically, the phosphorus-based flame retardant includes one or more of triphenyl phosphate, resorcinol bis(diphenyl phosphate), ammonium polyphosphate, or aluminum diethylphosphinate.

[0046] Specifically, the nitrogen-based flame retardant includes melamine cyanurate and / or melamine polyphosphate.

[0047] Specifically, the inorganic flame retardant includes one or more of aluminum hydroxide, magnesium hydroxide, or zinc borate.

[0048] The antioxidants described in this invention can be commonly used antioxidants, such as, but not limited to, hindered phenolic antioxidants and / or phosphite antioxidants.

[0049] Specifically, the hindered phenolic antioxidant is one or more of N,N'-hexamethylene bis(3,5-di-tert-butyl-4-hydroxyphenylpropionamide (Irganox 1098), pentaerythritol tetrakis(β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) (Irganox 1010), triethylene glycol bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate (Iragnox 245), octadecyl β-(4-hydroxy-3,5-di-tert-butylphenyl)propionate (Iragnox 1076), or 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)acrylic acid]-1,1-dimethyl}-2,4,8,10-tetraoxaspirocycloundecane] (ADK AO-80).

[0050] The phosphite antioxidant is one or more of tris(2,4-di-tert-butylphenyl) phosphite (Irganox 168), bis(2,6-di-tert-butyl-4-tolyl) pentaerythritol phosphite (PEP-36), or 627A.

[0051] The wear-resistant agent described in this invention can be a commonly used wear-resistant agent, such as, but not limited to, one or more of polydimethylsiloxane, aminopolysiloxane, polymethylphenylsiloxane, or polyether-modified polysiloxane.

[0052] The light stabilizer described in this invention can be a commonly used light stabilizer, such as, but not limited to, hindered amine light stabilizers, benzotriazole light stabilizers, or benzophenone light stabilizers.

[0053] Further, the PA / ASA composition comprises the following components in parts by weight: 50-70 parts of PA resin; 30-40 parts of ASA adhesive powder; 3-8 parts compatibilizer; 3-8 parts of modified thermoplastic elastomer; Additives: 0.5-5 parts.

[0054] This invention also protects a method for preparing the above-mentioned PA / ASA composition, comprising the following steps: The components are mixed evenly in proportion and then extruded and granulated to obtain the PA / ASA composition.

[0055] Specifically, the extruder is a twin-screw extruder.

[0056] Specifically, the twin-screw extruder is equipped with a vacuum devouring device.

[0057] Specifically, the vacuum degree of the vacuum devolatilization device is -0.05MPa to 0.1MPa.

[0058] Specifically, the temperature of the twin-screw extruder is 200~260℃.

[0059] This invention also protects the use of the above-mentioned PA / ASA composition in the preparation of automotive parts, especially in paint-free products, such as wheel covers, car grilles, bumpers, roof rack brackets, B-pillar trim panels, rearview mirror housings, and other materials.

[0060] This invention also protects an automotive part made using the above-described PA / ASA composition. Preferably, the automotive part is a paint-free automotive part.

[0061] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a PA / ASA composition. By adding a styrene-acrylonitrile-maleic anhydride copolymer with a specific maleic anhydride content as a compatibilizer to the PA / ASA system, and combining it with a certain amount of modified thermoplastic elastomer, the appearance of the PA / ASA composition can be effectively improved, while also exhibiting good impact strength. Attached Figure Description

[0062] Figure 1 Image showing the exterior without tiger stripes; Figure 2 Image showing a slight tiger-stripe pattern; Figure 3 Image showing a distinct tiger-stripe pattern; Figure 4 This is a picture showing a more severe tiger-stripe pattern. Figure 5This is a picture showing a severe tiger-skin pattern. Detailed Implementation

[0063] The present invention will be further described below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise stated, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents.

[0064] 1. Raw materials used in each embodiment and comparative example: PA resin: PA Resin 1: PA6 resin, PA6 M2400, with a relative viscosity of 2.42, purchased from Xinhui Meida; PA Resin 2: PA66 resin, PA66 EPR24, relative viscosity 2.36, purchased from Shenma; PA Resin A: PA6 resin, PA6 J2000, relative viscosity 2.0, purchased from PolymerShun; PA Resin B: PA6 resin, PA6 BE 3280, with a relative viscosity of 2.8, purchased from Jiangsu Hongsheng; ASA adhesive powder: ASA adhesive powder 1: LP2068X, particle size distribution 100~160nm, purchased from Entropy Energy; ASA adhesive powder 2: LP2065X, particle size distribution 200~300nm, purchased from Entropy Energy; Compatibilizer: Compatibilizer 1: Styrene-acrylonitrile-maleic anhydride copolymer, maleic anhydride content 2wt%, self-made; Compatibilizer 2: Styrene-acrylonitrile-maleic anhydride copolymer, maleic anhydride content 2.8wt%, self-made; Compatibilizer 3: Styrene-acrylonitrile-maleic anhydride copolymer, maleic anhydride content 0.5wt%, self-made; Compatibilizer 4: Styrene-acrylonitrile-maleic anhydride copolymer, maleic anhydride content 4wt%, self-made; Compatibilizers 1-4 are prepared by the following methods: SAN resin (Kumho Petrochemical, SAN 320NA), maleic anhydride (MAH) monomer, and dicumyl peroxide (DCP) are premixed uniformly in a high-speed mixer at a certain mass ratio; the mixture is placed in a twin-screw extruder and melt-blended at 180°C, and extruded at a screw speed of 250 rpm to obtain a compatibilizer; the amount of DCP is 0.1 wt% of SAN resin, and the feed ratio of maleic anhydride to SAN resin is (1~8):100, and the maleic anhydride content is adjusted by adjusting the feed ratio of raw materials.

[0065] Compatibilizer 5: Styrene-acrylonitrile-maleic anhydride copolymer, maleic anhydride content 2.5wt%, self-made; Compatibilizer 5 is prepared by the following method: SAN resin (Kumho Petrochemical, SAN 320NA), maleic anhydride (MAH) monomer, and azobisisobutyronitrile (AIBN) were dissolved in xylene solvent at a certain mass ratio. Under a nitrogen atmosphere, the mixture was mechanically stirred and refluxed in an oil bath at 110°C for 4 hours. After the reaction, the reaction solution was cooled to room temperature and slowly poured into excess ethanol with stirring to precipitate the product. The precipitate was collected by filtration and washed three times with fresh ethanol to remove residual solvent and unreacted monomers. Finally, the product was dried to constant weight in a vacuum drying oven at 50°C to obtain maleic anhydride-grafted styrene-acrylonitrile copolymer. The concentration of SAN in xylene was 0.1 g / mL, the amount of AIBN added was 0.5 wt% of the SAN resin, and the feeding ratio of maleic anhydride to SAN resin was 4:100.

[0066] Compatibilizer 6: Styrene-acrylonitrile-maleic anhydride copolymer, SMA-800, maleic anhydride content 8wt%, purchased from Huawen; Compatibilizer 7: Styrene-maleic anhydride copolymer, SMA-700, purchased from Huawen; Compatibilizer 8, styrene-maleic anhydride-N-phenylmaleimide copolymer, MS-NB, maleic anhydride content 2wt%, purchased from Denki Kagaku, Japan; Modified thermoplastic elastomers: Modified thermoplastic elastomer 1: glycidyl methacrylate grafted POE, SOG-02, GMA content 1~2wt%, purchased from Jia Yi Rong; Modified thermoplastic elastomer 2: maleic anhydride-grafted SEBS, KT-2511, maleic anhydride content of 0.7~1.0wt%, purchased from Shenyang Ketong Plastics Co., Ltd. Additives: Antioxidants: A compound of hindered phenolic antioxidants and hindered amine antioxidants in a 1:1 mass ratio, both of which are commercially available; Light stabilizers: A mixture of hindered amine light stabilizers and benzotriazole light stabilizers in a 1:1 mass ratio, both of which are commercially available; It should be noted that the same raw materials were used in the parallel experiments of the embodiments and comparative examples of the present invention.

[0067] 2. The PA / ASA compositions described in the examples and comparative examples were prepared according to the formulations in Tables 1-2 by the following method: The components are added to a high-speed mixer in proportion and mixed evenly. Then, the mixture is fed into a twin-screw extruder equipped with two vacuum devouring devices (vacuum degree of -0.05MPa to 0.1MPa) and extruded and granulated at 200~260℃ to obtain the PA / ASA composition.

[0068] 3. Performance Testing: (1) Tiger stripe measurement: A wide-plate spiral mold with a total flow length of 1000 mm was used for evaluation. The mold shape was an Archimedean line, 50 mm wide and 2 mm thick. Side gate injection was used, the injection temperature was 250℃, and the speed and pressure were 80%. The total spiral length L0, the starting length L1 of the appearance of tiger stripes (alternating light and dark stripes perpendicular to the flow direction), the total number of tiger stripes N, and the tiger stripe grade V were recorded. The tiger stripe grade was divided into 1-5 levels, with level 1 being no tiger stripe (e.g., no tiger stripe). Figure 1 As shown), Level 2 is mild (e.g. Figure 2 As shown), level 3 is obvious (e.g.) Figure 3 As shown), level 4 is more serious (e.g. Figure 4 As shown), level 5 is severe (e.g. Figure 5 (As shown). The flow mark index is calculated as V×N×(L0-L1) / L0. The higher the flow mark index, the more severe the tiger-stripe pattern; when the flow mark index is 0, the part has no tiger-stripe appearance.

[0069] (2) Notched impact strength test: The PA / ASA compositions prepared in each example and comparative example were injection molded into 80 mm × 10 mm × 4 mm specimens and tested according to standard ISO 179-2010. The notch type was type A notch.

[0070] Examples 1-13 and Comparative Examples 1-6 Table 1. Amounts (parts by weight) and properties of each component in the PA / ASA compositions of Examples 1-11

[0071] Table 2. Amounts (parts by weight) and properties of each component in the PA / ASA compositions of Examples 12-13 and Comparative Examples 1-6

[0072] The PA / ASA composition prepared in this invention has good appearance and impact strength, specifically: the tiger-skin pattern grade does not exceed level 2, and the notched impact strength of a simply supported beam at room temperature is not less than 40 KJ / m. 2 .

[0073] As can be seen from Comparative Examples 1 to 3, if the maleic anhydride content in the compatibilizer used is too high or if other types of compatibilizers are used to replace the compatibilizer in this invention, the tiger-skin pattern appearance of the obtained PA / ASA composition will be significantly worse.

[0074] As can be seen from Comparative Examples 4 and 5, without the addition of modified thermoplastic elastomers or compatibilizers, the resulting PA / ASA compositions exhibit significantly inferior tiger-skin pattern appearance or notched impact strength compared to the examples.

[0075] As can be seen from Comparative Example 6, if the amount of ASA adhesive powder is too large and does not meet the component ratio range of the present invention, even if the amount of compatibilizer is increased, the tiger-skin pattern appearance of the obtained PA / ASA composition is still poor.

[0076] As can be seen from Comparative Example 7, if the amount of modified thermoplastic elastomer is too large and does not meet the ratio range of each component in the present invention, the tiger-skin pattern appearance of the obtained PA / ASA composition is also poor.

[0077] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A PA / ASA composition, characterized in that, Includes the following components, calculated in parts by weight: 48-72 parts of PA resin; 28-42 parts of ASA adhesive powder; 1-10 parts compatibilizer; 1-10 parts of modified thermoplastic elastomer; The compatibilizer comprises a styrene-acrylonitrile-maleic anhydride copolymer, and the maleic anhydride content in the compatibilizer is not higher than 5 wt%; the modified thermoplastic elastomer contains epoxy groups and / or maleic anhydride.

2. The PA / ASA composition according to claim 1, characterized in that, The compatibilizer contains 0.5-4 wt% maleic anhydride; preferably, the compatibilizer contains 1.5-3.5 wt% maleic anhydride; more preferably, the compatibilizer contains 2-3 wt% maleic anhydride.

3. The PA / ASA composition according to claim 1, characterized in that, The modified thermoplastic elastomer comprises a thermoplastic elastomer grafted with GMA and / or a maleic anhydride grafted with thermoplastic elastomer, wherein the thermoplastic elastomer comprises a styrene-based elastomer and / or a polyolefin-based elastomer; preferably, the maleic anhydride grafted with styrene-based elastomer comprises maleic anhydride grafted with SEBS and / or maleic anhydride grafted with SBS; the maleic anhydride grafted with polyolefin elastomer comprises maleic anhydride grafted with POE and / or maleic anhydride grafted with EPDM; the styrene-based elastomer grafted with GMA comprises SEBS grafted with GMA and / or SBS grafted with GMA; and the polyolefin elastomer grafted with GMA comprises POE grafted with GMA and / or EPDM grafted with GMA.

4. The PA / ASA composition according to claim 1, characterized in that, The relative viscosity of the PA resin is 2 to 2.

6.

5. The PA / ASA composition according to claim 1, characterized in that, The PA resin is a mixture of PA resin A with a relative viscosity of 1.5 to 2 and PA resin B with a relative viscosity of 2.6 to 3.

6. The PA / ASA composition according to claim 1, characterized in that, The ASA rubber powder contains 40-70 wt% acrylate rubber and has a particle size distribution of 100-500 nm.

7. The PA / ASA composition according to claim 1, characterized in that, It also includes 0.1 to 10 parts of additives; the additives include one or more of flame retardants, antioxidants, abrasion retardants or light stabilizers.

8. A method for preparing the PA / ASA composition according to any one of claims 1 to 7, characterized in that, Includes the following steps: The components are mixed evenly in proportion and then extruded and granulated to obtain the PA / ASA composition.

9. The use of the PA / ASA composition according to any one of claims 1 to 7 in the preparation of automotive parts.

10. An automotive part, characterized in that, It is prepared using the PA / ASA composition according to any one of claims 1 to 7.

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