Resin composition capable of direct evaporation molding and preparation method thereof

Abstract

The invention discloses a thermoplastic resin composition capable of being formed by direct evaporation and a preparation method thereof. The composition comprises the following components in part by weight: 1 to 70 parts of thermoplastic resin, 10 to 60 parts of rubber grafted styrene resin copolymer, 0.2 to 5.0 parts of extracting agent, 0.1 to 2.0 parts of lubricant and 0.1 to 1.0 part of antioxidant. The preparation method of the composition comprises the following steps of: carrying out premixing on the extracting agent and the rubber-grafted styrene resin copolymer in a spray mode in a low speed mixer, adding the premixed materials, the thermoplastic resin, the lubricant and the antioxidant from a double-screw extrusion charging hole with a degasser and carrying out melt mixing at a temperature of 200 to 280 DEG C to obtain melt; and applying a low pressure of below 300mbar to a degassing region, ensuring the melt to stay in the degassing region for 20 to 50s, extruding and cooling to obtain the thermoplastic resin composition. According to the resin composition disclosed by the invention, the problems of fogging of the surface, forming precipitation, rugged surface and the like of a formed product are solved and the method is particularly suitable for the products which can be formed by directly evaporation.

Description

technical field [0001] The invention relates to a resin composition, in particular to a thermoplastic resin composition capable of direct evaporation molding and a preparation method. Background technique [0002] In order to improve the appearance and durability of auto parts and electronic and electrical products, it is often necessary to carry out surface metallization treatment on the product. A common example is the evaporation treatment of the lamp body of the automobile lamp. Before the evaporation treatment, the surface of the plastic part is often required to be sprayed. To eliminate defects on the surface of molded products to improve the qualified rate of evaporation, these defects are often caused by the volatile organic compounds (VOC) in the material during the molding process attached to the surface of the blank, the existence of these volatiles will not only cause evaporation The surface of the coating is foggy and will affect the subsequent welding performan...

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Problems solved by technology

Patent WO 2008 / 025446 discloses a PC / ABS mixture with low content of residual solvents, monomers and oligomers, which is degassed by an inert gas such as supercritical CO2, and is discharged from the degassing port by applying a low pressure, But the disadvantage is that the extruder and auxiliary equipment need to be specially designed and require heavy investment, and the requirements for process precision are relatively high, and it has been tested and tested that when the PC / ABS mixture of the invention is used for direct evaporation molding, its evaporation low yield

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