Halogen-free flame-retardant PC/ABS (polycarbonate/acrylonitrile butadiene styrene) mixture with high fluidity and high rigidity and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant PC / ABS (polycarbonate / acrylonitrile butadiene styrene) mixture with high fluidity and high rigidity and a preparation method thereof. The halogen-free flame-retardant PC / ABS mixture is prepared from the following raw materials in percentage by weight: 43 to 76% of PC resin, 13 to 43% of ABS resin, 0 to 5% of compatilizer, 5 to 10% of polyaromatic phosphate, 0.5 to 3% of phosphenylic acid rare earth salt, 0 to 2% of metal hybridized polysilsesquioxane, and 5 to 15% of short chopped carbon fiber. The preparation method comprises the following steps of mixing the raw materials (except the short chopped carbon fiber) by a high-speed mixer, adding into a material cylinder of an extruder via a main material feeding bin, adding the short chopped carbon fiber, melting and mixing by parallel double screw rods in the same direction, extruding and granulating, so as to obtain the halogen-free flame-retardant PC / ABS mixture with high fluidity and high rigidity. The prepared PC / ABS mixture has the advantages that the fluidity is good, the strength is high, the anti-static and flame-retardant properties are outstanding, and the like; the PC / ABS mixture is suitable for preparing ultrathin parts.

Description

technical field [0001] The invention relates to the field of PC / ABS alloy modification, in particular to a high fluidity and high rigidity halogen-free flame-retardant PC / ABS mixture and a preparation method thereof. Background technique [0002] At present, in the field of high-end electronic equipment, magnesium-aluminum alloy is mostly used as the equipment casing at home and abroad. This material is rigid and beautiful, but it is expensive and has a large specific weight, which cannot meet the development needs of lightweight. Carbon fiber composite materials can not only meet its lightweight requirements, but also endow the material with excellent mechanical properties, good electromagnetic shielding effect and antistatic effect. However, the addition of carbon fiber also has some negative effects on PC / ABS composite materials: on the one hand, the viscosity of the material melt increases, and the processing difficulty increases, making it difficult to meet the producti...

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Problems solved by technology

However, when it is used alone, its charcoal performance is poor, its flame retardant efficiency is low, and its addition amount is large, which seriously deteriorates the mechanical properties and processing properties of the material, and it is difficult to meet the performance requirements of carbon fiber reinforced PC / ABS composite materials. Therefore, a processability It is particularly urgent and important to develop a halogen-free flame-retardant PC / ABS composite material with good mechanical strength and high mechanical strength.

[0003] At present, research on halogen-free flame retardant and fiber-reinforced PC / ABS composites has made some progress. Wei et al. used aluminum hypophosphite (AHP) and ethylene-methyl acrylate-glycidyl methacrylate copolymer (EMA) Flame-retardant and toughened PC / ABS can achieve high-efficiency flame-retardant while maintaining the mechanical properties of the matrix without being greatly affected, but the flow properties are significantly deteriorated, which is not conducive to processing (Wu N, Lang S. Flame retardancy and toughness modification of flame retardant polycarbonate / acrylonitrile‐butadiene‐styrene / AHP composites[J].Polymer Degradation and Stability,2016,123:26‐35.); Chinese invention patent application CN103013089A discloses a flame-retardant glass fiber reinforced PC / ABS composite material and its The preparation method proposes to add appropriate amount of N, N ethylene bis stearic acid amide and erucic acid amide as internal and external lubricants and anti-glass fiber leakage agents to realize the synergistic effect of the two, so that the fibers are dispersed evenly and the mechanical properties of the material are improved. , but the glass fiber deteriorates the fluidity of the PC / ABS composite material and cannot be used to prepare ultra-thin parts; It is used as a flame retardant and compounded with processing aids such as styrene-maleic anhydride copolymer and methyl methacrylate / butadiene / styrene terpolymer to develop a halogen-free flame retardant with good fluidity PC / ABS (Wei Fenfen, Xie Shiping. Preparation of High Fluidity Halogen Free Flame Retardant PC / ABS Alloy [J]. Shandong Chemical Industry, 2014, 7:017.)

However, the deterioration of the mechanical properties of PC / ABS by TPP is very serious, and the decomposition temperature of TPP is low, so it is easy to volatilize and degrade during processing

[0004] The above existing technologies related to PC / ABS alloy reinforcement and flame retardancy cannot take into account the balance between flame retardancy, mechanical properties and processing properties, and are difficult to apply to ultra-thin electronic parts and lightweight components

At present, there are no research reports on PC / ABS mixtures with high fluidity, high rigidity and high flame retardancy at home and abroad.

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