High-flow, impact-resistant, low-gloss pc / abs material for automotive interiors and method for producing the same

Abstract

The application discloses a high-flow, impact-resistant and low-gloss PC / ABS material for automobile interiors and a preparation method thereof. The low-gloss PC / ABS alloy material comprises the following components in parts by weight: 50-70 parts of polycarbonate (PC); 20-50 parts of acrylonitrile-butadiene-styrene copolymer (ABS) resin; 3-5 parts of a compatilizer; 3-7 parts of a toughening agent; 0.3-1 part of a light stabilizer; and 0.3-1 part of a heat stabilizer. The technical scheme has the following beneficial effects: (1) the ABS3274 low-cyanide low-gel introduced promotes the compatibility with PC, can improve the flexibility of the polymer molecular chain, and further increases the flowability of the PC / ABS alloy; (2) the ABS3274 high-gel particle size introduced forms a small high-low relief pattern on the surface, increases the roughness of the surface, and further achieves the low-gloss effect; and (3) the ABS3274 introduced has an obvious gloss reduction effect, can partially or completely reduce the use of the matting agent, significantly reduces the material cost, and maintains the comprehensive performance at a good level.

Description

Technical Field

[0001] This invention relates to the field of alloy materials technology, and specifically to a method for preparing a high-flow, impact-resistant, low-gloss PC / ABS material for automotive interiors. Background Technology

[0002] PC / ABS alloy material is obtained by melt blending polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS). PC / ABS alloy has heat resistance, impact resistance, and good processing performance, and is currently widely used in electronics, electrical appliances, and automotive parts. In the automotive interior field, to avoid various glare and reflections formed by high-gloss parts on the windshield, reduce driver visual fatigue, and improve safety, it is necessary to give the parts ultra-low gloss properties.

[0003] The design strategies for low-gloss interior parts generally include several aspects: 1) Matte paint spraying. Achieving low gloss through matte paint spraying is prone to high costs and severe environmental pollution. 2) Surface texturing treatment. This is generally achieved by adjusting the mold surface to create an uneven textured structure on the injection molded part, resulting in a low-gloss surface effect. However, mold wear can weaken the textured structure, causing the gloss to return. 3) Application of low-gloss materials. Typically, reducing material gloss involves adding matting agents and fillers to create a rough surface structure, achieving a matte effect. However, adding these substances can lead to poor material flowability and reduced impact strength, failing to meet the requirements for high-performance materials. Improving the interplay between flowability, impact toughness, and gloss in low-gloss PC / ABS materials is becoming increasingly important for enhancing their practical application value.

[0004] This invention introduces a method for preparing a high-flow, impact-resistant, low-gloss PC / ABS material that meets the requirements of automotive interior applications. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing PC / ABS materials with high flowability, impact resistance, and low gloss, so as to solve the above-mentioned problems in the prior art.

[0006] The objective of this invention is achieved through the following technical solutions.

[0007] A high-flow, impact-resistant, low-gloss PC / ABS material for automotive interiors is composed of the following raw materials in parts by weight: 50-70 parts polycarbonate (PC); 20-50 parts acrylonitrile-butadiene-styrene copolymer (ABS) resin; 3-5 parts compatibilizer; 3-7 parts toughening agent; 0.3-1 part light stabilizer; and 0.3-1 part heat stabilizer.

[0008] The PC mentioned is one or more of the polycarbonate resin system. Lotte Chemical 1100 is preferred.

[0009] The ABS resin is one or more of the acrylonitrile-butadiene-styrene copolymer system. Preferred resins are Shengxi A371 and Huajin 3274.

[0010] The compatibilizer is one or a combination of maleic anhydride grafts.

[0011] The toughening agent is one or a combination of ABS powder, MBS and EBS.

[0012] The light stabilizer is one or more of benzotriazole and benzophenone light stabilizers.

[0013] The heat stabilizer is one or more of hindered phenolic antioxidants and phosphate ester antioxidants.

[0014] The preparation method of the above-mentioned high-flow, impact-resistant, low-gloss PC / ABS material includes the following steps:

[0015] 1) Weigh each ingredient according to the above formula;

[0016] 2) After the dried raw materials are mixed, they are continuously and evenly fed into the main barrel of a twin-screw extruder with a screw diameter of 35mm and a length-to-diameter ratio of L / D = 40 using a twin-screw feeder. The temperature of the main barrel is controlled in sections from the feed port to the die outlet at 100℃, 255℃, 255℃, 245℃, 245℃, 240℃, 240℃, 235℃, 235℃, and 225℃. The twin screw speed is 500 rpm. After the extruded strip is cooled in a water tank, it is granulated to obtain the product.

[0017] The low-gloss PC / ABS alloy material and its preparation method of the present invention improve the flexibility of molecular chains and increase the surface roughness by introducing high-flow, low-gloss ABS3274 resin from the microstructure, thereby affecting the flowability of the material and reducing its gloss.

[0018] The beneficial effects of the technical solution of this invention are as follows:

[0019] (1) The introduction of ABS 3274 with low acrylonitrile and low adhesiveness promotes compatibility with PC, improves the flexibility of polymer molecular chains, and thus increases the fluidity of PC / ABS alloy.

[0020] (2) The high particle size of ABS 3274 introduced forms a small undulating morphology on the surface, which increases the surface roughness and thus achieves a low gloss effect.

[0021] (3) The introduction of ABS 3274 has a significant gloss reduction effect, which can partially or completely reduce the use of matting agents, not only significantly reducing material costs, but also maintaining a good level of overall performance. Detailed Implementation

[0022] The present invention will be further described below through specific embodiments, but the embodiments are only used to illustrate the present invention and not to limit the present invention.

[0023] Raw materials used in this invention:

[0024] PC-1: Lotte Chemicals, 1100;

[0025] ABS Resin-1: Shengxi'ao, A371;

[0026] ABS Resin-2: Huajin, 3274;

[0027] Compatibilizer: Maleic anhydride graft;

[0028] Toughening agent: ABS powder, manufactured by Kumho Sunray Chemical, HR-181

[0029] Light stabilizer-1: Benzotriazole light stabilizer.

[0030] Light stabilizer-2: Benzophenone-based light stabilizers

[0031] Heat stabilizer-1: Hindered phenolic antioxidant, manufactured by DOUBLE BOND CHEMICAL IND. Ltd., 1010;

[0032] Heat stabilizer-2: Phosphate ester antioxidant, manufactured by Ciba AG, Switzerland, 619F;

[0033] Product performance testing methods:

[0034] Notched impact strength: KJ / m2 according to ISO 179-1 / 1eA method;

[0035] Melt flow rate: according to ISO-1133-1 method, 260℃ / 5kg, g / 10min;

[0036] Gloss: 60° according to GB / T 8807 method;

[0037] Examples 1-4 and Comparative Examples 1-2

[0038] The dried PC, ABS resin, compatibilizer, toughening agent, light stabilizer, and heat stabilizer were mixed according to the proportions in Table 1 and continuously and evenly fed into the main barrel of a twin-screw extruder (screw diameter 35mm, L / D ratio L / D = 40) using a twin-screw feeder. The temperature of the main barrel was controlled in sections (from the feed port to the die outlet) at 100℃, 255℃, 255℃, 245℃, 245℃, 240℃, 240℃, 235℃, 235℃, and 225℃. The twin-screw speed was 500 rpm. After the extruded strip was cooled in a water bath, it was granulated to obtain the product. The above product was dried in a forced-air oven at 100℃ for 4 hours and then injection molded into standard test strips using a plastic injection molding machine at an injection temperature of 245℃. The injection-molded test strips were immediately placed in a glass desiccator and left at room temperature for at least 24 hours before performance testing. The test results are shown in Table 1.

[0039] Table 1 Composition and Properties of Modified PC / ABS Materials

[0040] Material composition Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 PC-1 60 60 60 60 60 60 ABS Resin-1 35 35 ABS Resin-2 35 32 30 30 compatibilizer 5 5 5 5 5 5 toughening agent 3 5 5 matting agent 1 2 Light stabilizer-1 0.5 0.5 0.5 0.5 0.5 0.5 Light stabilizer-2 0.5 0.5 0.5 0.5 0.5 0.5 Heat stabilizer-1 0.15 0.15 0.15 0.15 0.15 0.15 Heat stabilizer-2 0.3 0.3 0.3 0.3 0.3 0.3 Test performance Low-temperature notched impact strength 22.5 30.2 40.5 28 25.6 21.7 melt flow rate 28.6 23.7 21.8 20.3 22.1 18 gloss 4.5 6.7 7.5 3.2 20.6 6.4

[0041] Comparing the test results of Examples 1, 2, 3, and 4 with Comparative Examples 1 and 2, it can be seen that the gloss of the PC / ABS material is significantly reduced when ABS resin-2 is added, but the low-temperature notched impact strength also decreases. Appropriate selection and formulation of the toughening agent and ABS resin-2 ratio in the PC / ABS material can yield a PC / ABS material with high fluidity, good toughness, and low gloss. After selecting a suitable material ratio, increasing the amount of matting agent can further reduce the gloss of the material.

Claims

1. A high-flow, impact-resistant, low-gloss PC / ABS material for automotive interiors, characterized in that: It is composed of the following raw materials in parts by weight: 50-70 parts of polycarbonate (PC); 20-50 parts of acrylonitrile-butadiene-styrene copolymer (ABS) resin; 3-5 parts of compatibilizer; 3-7 parts of toughening agent; 0.3-1 part of light stabilizer; 0.3-1 part of heat stabilizer; the ABS resin is Huajin 3274.

2. The high-flow, impact-resistant, low-gloss PC / ABS material for automotive interiors according to claim 1, characterized in that: The PC mentioned is Lotte Chemical 1100.

3. The high-flow, impact-resistant, low-gloss PC / ABS material for automotive interiors according to claim 1, characterized in that: The compatibilizer is one or a combination of maleic anhydride grafts.

4. The high-flow, impact-resistant, low-gloss PC / ABS material for automotive interiors according to claim 1, characterized in that: The toughening agent is one or a combination of ABS powder and MBS.

5. The high-flow, impact-resistant, low-gloss PC / ABS material for automotive interiors according to claim 1, characterized in that: The light stabilizer is one or more of benzotriazole and benzophenone light stabilizers.

6. The high-flow, impact-resistant, low-gloss PC / ABS material for automotive interiors according to claim 1, characterized in that: The heat stabilizer is one or more of hindered phenolic antioxidants and phosphate ester antioxidants.

7. The method for preparing a high-flow, impact-resistant, low-gloss PC / ABS material according to any one of claims 1-6, characterized in that, The steps are as follows: 1) Weigh each ingredient according to the above formula; 2) After the dried raw materials are mixed, they are continuously and evenly fed into the main barrel of a twin-screw extruder with a screw diameter of 35mm and a length-to-diameter ratio of L / D = 40 using a twin-screw feeder. The temperature of the main barrel is controlled in sections from the feed port to the die outlet at 100℃, 255℃, 255℃, 245℃, 245℃, 240℃, 240℃, 235℃, 235℃, and 225℃. The twin screw speed is 500 rpm. After the extruded strip is cooled in a water tank, it is granulated to obtain the product.