Preparation method of scratch-resistant lacquer-free ABS moulding composition with high glaze

Abstract

The invention relates to a preparation method of a scratch-resistant lacquer-free ABS moulding composition with high glaze. The moulding composition comprises at least two acrylonitrile-butadiene-styrene graft copolymers with specific rubber phase grain diameter, rubber content and fusant flow characteristic, at least one of acrylonitrile-styrene copolymer with specific fusant flow characteristic, polymethylmethacrylate and polymethylmethacrylate copolymer, and black master batch made from hyperchromatic carbon black. The fusants with different flow characteristics are properly split and enriched by a moulding process such that the moulding article maintains the excellent shock-resistant toughness and has the scratch-resistant surface effect with high glaze without lacquering treatment.

Description

Technical field: [0001] The invention relates to a preparation method of a high-gloss anti-scratch paint-free ABS molding composition, belonging to the field of polymer processing. Background technique: [0002] Acrylonitrile-butadiene-styrene copolymer (ABS, Acrylonitrile-Butadiene-Styrene) has the characteristics of excellent processing fluidity, low temperature impact toughness and excellent dyeability due to the rational use of the advantages of each copolymerization composition. It is the most widely used resin variety in engineering plastics for household appliances. It is mainly used to make the shells and internal structural parts of TVs, computers, refrigerators, audio and video recorders, air conditioners, vacuum cleaners, telephones, electronic pianos and other small household appliances. By changing the ratio of the three components of ABS, the polymerization method, the particle size of the rubber phase and other parameters, a series of ABS varieties with differ...

AI Technical Summary

Problems solved by technology

A single ABS resin system is difficult to meet the requirements at the same time due to the low rubber phase content and small particle size required for high surface gloss and the high rubber phase content and large particle size required for high impact toughness, and the general surface hardness of ABS products Low, poor scratch resistance, unable to meet special application requirements

The traditional solution is to spray paint on the surface of ordinary injection molded products to meet the requirements for surface gloss and scratch resistance. However, spray paint not only increases the processing steps, but also increases the cost of materials, and the organic solvent used in spray paint pollutes the environment. , and cause harm to the operators. At the same time, the thermosetting surface coating also has a negative impact on the recycling of thermoplastic products.

[0004] CN101058623 discloses a preparation method of high-gloss injection molding grade ABS polymer based on continuous bulk method. By improving the synthesis process, different rubber particle sizes and distributions can be obtained by reacting under specific conditions, and high-gloss injection molding with good comprehensive performance can be obtained. Grade ABS polymer, due to starting from the front end of material synthesis, the flexibility of this method is low, while the surface gloss of the product is limited, and the scratch resistance of the product is improved very little; CN1404506 discloses an improved Processable and high-gloss ABS molding composition containing three butadiene polymer latices of defined particle size, particle size distribution and gel content from a synthetic point of view, at least one polybutadiene Polyethylene latex is prepared by seed polymerization, but this method cannot simultaneously achieve high gloss, high toughness and scratch resistance of the material

There are also many studies on ABS / polymethyl methacrylate (PMMA) and ABS / styrene-acrylonitrile copolymer (SAN) blended alloys, but most of them focus on their compatibility and mechanical properties. Gloss, hardness, etc. are studied, not to mention the phase structure control of melt rheology [The influence of the continuous change of the relative molecular weight of SAN resin on the mechanical properties of ABS resin, Tan Zhiyong, Zhang Mingyao, Yang Haidong, Zhang Huixuan, Polymer Materials Science and Engineering , Vol. 20, No. 2, 2004; Research on the Composition and Properties of ABS / PMMA Alloy, Jin Minshan, Hong Chongkui, Huang Yingchao, Changping, Plastics, Vol. 232, No. 1, 2003]

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