Matt PC-ABS (polycarbonate-acrylonitrile-butadiene-styrene) material as well as preparation method and application thereof

Abstract

The invention discloses a matte PC-ABS (polycarbonate-acrylonitrile-butadiene-styrene) material as well as a preparation method and application thereof, and the matte PC-ABS material comprises the following components in parts by weight: 55-45 parts of PC, 35-25 parts of ABS, 0-10 parts of a toughening agent, 0-10 parts of a matte agent, 0.1-0.5 part of an antioxidant and 0.1-1 part of a lubricant. According to the invention, in a PC / ABS material system, the specific matting agent is selectively added, a certain amount of flexibilizer is added, and the flexibilizer, the antioxidant and the lubricant are synergistically matched, so that the PC / ABS has good matting performance, high toughness and color uniformity can be maintained, the application space of the PC-ABS material is widened, and the PC-ABS material has good application prospects. The application of the PC / ABS material in the spraying-free field can be realized, and the cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a matte PC-ABS material, a preparation method and application thereof. Background Art

[0002] The matte principle is to use the incompatibility of two substances or the cross-linking of polymers to reduce the gloss of the material surface: when the polymer alloy with matting agent is injected into products or samples, the incompatibility of the material itself or the micro-gelation effect caused by chemical cross-linking will form a micro-rough (concave-convex) effect on the material surface. When the incident light reaches the micro-rough surface, the reflection direction of the light will change, and diffuse reflection will occur, thus producing a low-gloss appearance and achieving the purpose of matting.

[0003] The main factors affecting the glossiness of PC / ABS are: ① The glossiness of the material itself; ② The fluidity of the material. If the material has ultra-high fluidity, during injection molding, the ultra-high fluidity material will be concentrated on the surface of the component, so it will show a very good mold replication effect, and finally get a good low-light effect; ③ The matte effect of the mold leather grain.

[0004] Generally speaking, the matte effect of the mold surface grain plays a decisive role in the final gloss effect of the component; however, in some materials with poor fluidity, even if the mold itself has a good low-gloss effect, if the material does not replicate the mold grain well, the low-gloss effect of the molded product will not achieve the ideal effect.

[0005] In practical applications, the color uniformity of matte materials is a complex and critical technical issue, which is directly related to the visual quality of the final product. Current matte PC-ABS materials often face the problem of long-term mixing of raw materials to ensure color uniformity, resulting in low efficiency. Summary of the invention

[0006] In view of the above-mentioned deficiencies of the current PC-ABS materials, the present invention provides a matte PC-ABS material, a preparation method and an application thereof, which improves the notched impact strength without reducing the flexural modulus, and innovatively develops a matte and uniformly colored PC-ABS material.

[0007] To achieve the above object, the embodiments of the present invention adopt the following technical solutions: A matte PC-ABS material, comprising the following components by weight: PC 55-45 copies; ABS 35-25 copies; Toughener 0-10 parts; Matting agent 0-10 parts; Antioxidant 0.1-0.5 parts; Lubricant 0.1-1 part.

[0008] The toughening agent is one or a mixture of liquid acrylic rubber, liquid polybutadiene rubber, nitrile rubber, ethylene propylene rubber and styrene butadiene rubber.

[0009] The matte agent is one of cross-linked styrene-acrylonitrile copolymer (BMAT), semi-cross-linked styrene-acrylonitrile copolymer (XGM), a polymer containing epoxy functional groups, PMMA, or a mixture of two thereof.

[0010] The ABS is manufactured by a bulk method.

[0011] By adopting the above technical solution, the viscosity of the PC will affect the fluidity of the material. The material with good fluidity will be concentrated on the surface of the component, showing a very good mold replication effect, and finally a good low-light effect will be obtained. In the production process of emulsion ABS, not all emulsifiers or salts can be removed. Some of them will remain in the primary emulsion ABS resin as impurities, and the resin base color will be yellowish. Due to the different impurity contents in the resin, the primary emulsion ABS resin has different degrees of yellowish base color. Bulk ABS uses polybutadiene rubber, styrene and acrylonitrile for polymerization. Since no emulsifier or salt is used in the production process, the primary ABS resin produced has a white base color and uniform color. The toughening agent is a kind of auxiliary agent that reduces the brittleness of the composite material and improves the impact resistance of the composite material. It can be divided into two categories: active toughening agent and inactive toughening agent. The active toughening agent refers to an active group on its molecular chain that can react with the matrix resin. It can form a network structure and increase a part of the flexible chain, thereby improving the impact resistance of the composite material. Inactive toughening agents are a type of toughening agent that is well soluble in the matrix resin but does not participate in chemical reactions.

[0012] By adopting the above technical solution, the matting agent reacts with the terminal hydroxyl group of PC to branch or partially cross-link the PC. The molecular weight of the branched or cross-linked PC is greatly increased, but the end group concentration decreases rapidly, and the compatibility of the PC and ABS interface is also reduced compared with before branching, thereby achieving a matting effect.

[0013] Preferably, the lubricant is one or a mixture of pentaerythritol stearate, polydimethylsiloxane, and ethylene bisstearamide.

[0014] Preferably, the antioxidant is antioxidant 168.

[0015] In a second aspect, a method for preparing a matte PC-ABS material is characterized by comprising the following steps: S1: After the raw materials are uniformly mixed with a high-speed mixer, carbon black and a composite dye are added and mixed again to obtain a composite raw material; S2: adding the composite raw materials into a twin-screw extruder for melt co-extrusion, cooling, drying and pelletizing after screw extrusion to obtain a matte PC-ABS material.

[0016] Preferably, in step S1, the high-speed mixer mixes the raw materials for 6 minutes and then mixes for 10 minutes.

[0017] Preferably, in step S2, the temperature of zone 2 of the extruder is 230°C, the temperature of zone 3 is 240°C, the temperature of zone 4 is 250°C, the temperature of zone 5 is 245°C, the temperature of zone 6 is 255°C, the temperature of zone 7 is 255°C, the temperature of zone 8 is 255°C, the temperature of zone 9 is 255°C, the temperature of zone 10 is 255°C, and the temperature of zone 11 is 250°C.

[0018] Preferably, in step S2, the screw speed of the extruder is 550 r / min and the residence time is 3 min.

[0019] Thirdly, the matte PC-ABS material mentioned above is used in the production of automotive interiors, communication equipment, and electronic appliances.

[0020] The advantages of the implementation of the present invention are as follows: by adding a toughening agent and a matte agent to a PC-ABS material, the gloss of the composite material is reduced, the brittleness of the composite material is reduced, the impact resistance of the composite material is improved, and the toughness of the PC-ABS is enhanced, the gloss of the spray-free material is reduced, and the application space of the PC-ABS material is broadened, so that the application of the PC / ABS material in the spray-free field can be realized and the cost can be reduced. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The raw materials used in the examples and comparative examples of the present invention are all commercially available, but are not limited to these materials: High viscosity PC (MFR≤6 g / 10min): LEXAN™ PC950, LEXAN™ PC PK2870, LEXAN™ PCML3290; Medium viscosity PC (MFR≤15 g / 10min): LEXAN™ PC 945A-116, LEXAN™ PC 940-201; Low viscosity PC (MFR ≤ 30 g / 10 min): LEXAN™ PC 923A-1129, LEXAN™ PC 121R-11011; Bulk ABS, POLYLAC®ABS, Chi Mei Company, Taiwan, China.

[0023] The reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased from the market.

[0024] Preparation methods of embodiments and comparative examples: S1: First, PC, ABS, toughening agent, matte agent, antioxidant and lubricant are mixed uniformly with a high-speed mixer according to the ratio of the implementation ratio, and the mixing time is 6 minutes, and carbon black and composite dye are added, and the mixing time is 10 minutes; S2: Add the mixed raw materials into a twin-screw extruder for melt co-extrusion, the extruder temperature: the temperature of zone 2 is 230℃, the temperature of zone 3 is 240℃, the temperature of zone 4 is 250℃, the temperature of zone 5 is 245℃, the temperature of zone 6 is 255℃, the temperature of zone 7 is 255℃, the temperature of zone 8 is 255℃, the temperature of zone 9 is 255℃, the temperature of zone 10 is 255℃, the temperature of zone 11 is 250℃, the extruder screw speed is 550 rpm, and the residence time is 3min. After screw extrusion, cooling, drying, and pelletizing are performed to obtain matte PC-ABS material.

[0025] Related performance test methods: (1) Bending properties: Tested according to ISO 178-2010 standard, span 64 mm, test rate 2 mm / min; (2) Simple supported beam notched impact strength: tested according to ISO 179-1eA standard, notch depth 2 mm, 23°C, -30°C; (3) Gloss: Tested according to ISO 2813-2014 standard, tested at an angle of 60°.

[0026] Examples 1-7 are matte PC-ABS materials of the present invention. The raw materials and weight portions of the matte PC-ABS materials of Examples 1-7 are shown in Table 1.

[0027] Table 1: Raw materials and weight parts of matte PC-ABS materials in the examples

[0028] The performance test results of the matte PC-ABS materials of Examples 1-7 are shown in Table 2.

[0029] Table 2: Performance test results of matte PC-ABS materials in the examples

[0030]

[0031] Comparative Examples 1-9 are matte PC-ABS materials of the present invention. The raw materials and weight portions of the matte PC-ABS materials of Comparative Examples 1-9 are shown in Table 3.

[0032] Table 3: Raw materials and weight parts of matte PC-ABS materials of comparative example

[0033] The performance test results of the matte PC-ABS materials of Comparative Examples 1-9 are shown in Table 4.

[0034] Table 4: Performance test results of matte PC-ABS materials of comparative example

[0035] Based on the above data, it can be seen from Examples 1-7 that increasing the proportion of toughening agent can reduce the brittleness of the composite material and improve the impact resistance of the composite material, and increasing the proportion of matting agent can reduce the gloss of the composite material to achieve a matting effect. By comparing Comparative Examples 1 to 9, it can be seen that high-viscosity PC can increase the rigidity and strength of the product; by comparing Comparative Example 5 with Example 7, it can be seen that the increase of matting agent can reduce the gloss of the product, but will reduce the bending strength and impact resistance of the product; by comparing Comparative Example 8, Example 4, Example 6 and Example 7, it can be seen that the increase of toughening agent improves the matting effect of matting agent.

[0036] The raw materials for preparing the PC-ABS material of Comparative Example 10 are the same as those of Example 1, except that the ABS used is prepared by an emulsion method. The gloss comparison results of the PC-ABS materials of Comparative Example 10 and Example 1 at different positions are as follows.

[0037]

[0038] Based on the above data, it can be seen from the comparison between Comparative Example 10 and Example 1 that the use of ABS manufactured by the bulk method as a raw material can effectively increase the color uniformity of the PC-ABS material.

[0039] The advantages of the implementation of the present invention are as follows: by adding a toughening agent and a matte agent to a PC-ABS material, the gloss of the composite material is reduced, the color uniformity of the material is improved, and the impact resistance of the composite material is improved, so that the toughness of the PC-ABS is enhanced, the gloss of the spray-free material is reduced, and the application space of the PC-ABS material is broadened, so that the application of the PC / ABS material in the spray-free field can be realized and the cost can be reduced.

[0040] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A matte PC-ABS material, characterized in that: By weight, it includes the following components: PC 55-45 copies; ABS 35-25 copies; Toughener 0-10 parts; Matting agent 0-10 parts; Antioxidant 0.1-0.5 parts; Lubricant 0.1-1 part; The toughening agent is one or a mixture of liquid acrylic rubber, liquid polybutadiene rubber, nitrile rubber, ethylene propylene rubber and styrene butadiene rubber; The matte agent is one or a mixture of cross-linked styrene-acrylonitrile copolymer, semi-cross-linked styrene-acrylonitrile copolymer, polymer containing epoxy functional group, PMMA; The ABS is manufactured by a bulk method.

2. The matte PC-ABS material according to claim 1, characterized in that: The lubricant is one or a mixture of pentaerythritol stearate, polydimethylsiloxane, and ethylene bisstearamide.

3. The matte PC-ABS material according to claim 1, characterized in that: The antioxidant is antioxidant 168.

4. A method for preparing a matte PC-ABS material, characterized in that: The following steps are involved: S1: After the raw materials are uniformly mixed with a high-speed mixer, carbon black and a composite dye are added and mixed again to obtain a composite raw material; S2: adding the composite raw materials into a twin-screw extruder for melt co-extrusion, cooling, drying and pelletizing after screw extrusion to obtain a matte PC-ABS material.

5. The method for preparing matte PC-ABS material according to claim 4, characterized in that: In step S1, the high-speed mixer mixes the raw materials for 6 minutes and then mixes for 10 minutes.

6. The method for preparing matte PC-ABS material according to claim 4, characterized in that: In step S2, the temperature of zone 2 of the extruder is 230°C, the temperature of zone 3 is 240°C, the temperature of zone 4 is 250°C, the temperature of zone 5 is 245°C, the temperature of zone 6 is 255°C, the temperature of zone 7 is 255°C, the temperature of zone 8 is 255°C, the temperature of zone 9 is 255°C, the temperature of zone 10 is 255°C, and the temperature of zone 11 is 250°C.

7. The method for preparing matte PC-ABS material according to claim 4, characterized in that: In step S2, the extruder screw speed is 550 r / min and the residence time is 3 min.

8. Application of the matte PC-ABS material according to any one of claims 1 to 7 in the production of automobile interiors, communication equipment, and electronic appliances.

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