High-gloss and low-volatility flame retardant polycarbonate composition as well as preparation method and application thereof

Abstract

The invention discloses a high-gloss and low-volatility flame retardant polycarbonate composition as well as a preparation method and application thereof. The polycarbonate composition consists of the following components: 100 parts of PC resin, 5-30 parts of acrylonitrile butadiene styrene (ABS) resin, 5-20 parts of a phosphate fire retardant, 0-20 parts of glass fiber, 0.5-2 parts of a high-gloss additive, 0.5-2 parts of fennelflower, 0.3-1 part of an anti-dropping agent and 0.1-2 parts of an additive. The preparation method comprises the steps of mixing the PC resin, the ABS resin, the high-gloss additive, the anti-dropping agent, the fennelflower and the additive in a high-speed mixer for 1-2min to obtain a premix; melting and extruding the premix through a dual-screw extruder; laterally feeding the phosphate fire retardant and the glass fiber, and implementing secondary vacuum pelleting to obtain a finished product. The flame retardant polycarbonate composition disclosed by the invention, through the high-gloss additive, improves gloss thereof, and simultaneously avoids remarkable change in mechanical performance, flowing property and flame retardant performance; the prepared flame retardant polycarbonate composition is high in gloss, good in fluidity, low in volatile content and excellent in mechanical performance, and is applicable to such electronic appliances as television and computer frame as well as products having requirement on high gloss such as automobile.

Description

technical field [0001] The invention relates to a flame-retardant polycarbonate composition, in particular to a high-gloss, low-volatility flame-retardant polycarbonate composition and a preparation method and application thereof. Background technique [0002] Flame-retardant PC / ABS alloy is a material with good comprehensive performance. It not only has the advantages of PC and ABS, such as good heat resistance, high fluidity, good chemical resistance and stress cracking ability, but also has high flame retardancy. grade. Therefore, flame-retardant PC / ABS alloys are widely used in household appliances such as televisions, automobile industry and communication equipment. For halogen-free flame-retardant PC / ABS alloys, the mainstream of the market is phosphate ester flame retardants. For example, European patent EP-A-0174493 uses small molecule triphenyl phosphate (TPP) as a flame retardant for PC / ABS alloys and has obtained Good flame retardant effect. Although TPP has a ...

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Problems solved by technology

Although TPP has a good flame retardant effect, it is easy to volatilize during processing due to its small molecular weight, which eventually leads to easy precipitation when molding high-gloss parts and affects the appearance

[0003]Preparing high-gloss and low-volatility flame-retardant PC / ABS alloys has always been a difficult point in the industry. Patent WO2007052074-A2 discloses a palladium-doped molecular sieve to adsorb gas. This kind of molecular sieve can effectively adsorb volatile gas for a long time, especially in a humid environment, and is an effective gas gas remover. However, the substances adsorbed by the molecular sieve still exist in the system. risk of re-release

CN 101759978 A adds about 20% PMMA to the flame-retardant PC / ABS alloy to improve the gloss of the material and achieve certain effects, but the mechanical properties of the material are not high enough due to the limited compatibility between PMMA and the PC / ABS system

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