Low-smell PC/ABS alloy and preparation method thereof

Abstract

The invention provides low-smell PC / ABS alloy and a preparation method thereof. The preparation method comprises the following steps: weighing preparation raw materials, and mixing the preparation rawmaterials to obtain mixture, wherein the preparation raw materials are prepared from the following components in parts by weight: 5-80 parts of polycarbonate resin, 5-80 parts of acrylonitrile-butadiene-styrene resin, 0-40 parts of filler and 0.2-10 parts of additives; and feeding the mixture into an extruding machine, and performing melting, extrusion and granulation under the condition of microwave heating. Microwaves are introduced to preparation of a PC / ABS composite material to ensure that heat penetrates into the interior of the raw materials to avoid unnecessary over-reaction caused bylocal overheating, thereby effectively reducing the decomposition of the raw materials into small molecular compounds with peculiar smell during production, and obviously reducing the smell level ofthe PC / ABS alloy; the process is simple and environment-friendly, and additives for reducing organic small molecules do not need to be added additionally; and the properties of the PC / ABS alloy can not be influenced.

Description

technical field [0001] The invention relates to the field of polymer composite materials, in particular to a low-odor PC / ABS alloy and a preparation method thereof. Background technique [0002] PC / ABS alloys are widely used in industries such as automobiles, home appliances, electronics, and medical equipment. However, during use, PC / ABS alloys will release certain odorous or harmful substances to the human body to varying degrees, especially in high temperature environments. Harmful odor to health. When the smell in the car reaches a certain concentration, the driver and passengers may experience symptoms such as dizziness, headache, fatigue and nausea. In severe cases, it will damage the liver, kidneys, brain and nervous system of the human body, resulting in memory loss. From July 1, 2018, my country will use the current recommended standard ("Guidelines for the Evaluation of Air Quality in Passenger Cars" (GB / T27630-2011)) as a mandatory standard for automotive materia...

AI Technical Summary

Problems solved by technology

[0005] Second, add a vacuum devolatilization device in the extrusion granulation section: install a vacuum device in the screw extruder to maintain a high degree of vacuum during the extrusion granulation process, which is widely used in the PC / ABS alloy modification industry The method requires harsh processing conditions and high energy consumption. At the same time, a single vacuum devolatilization device cannot completely remove odorous and volatile substances, and must be used in conjunction with other measures.

[0006] Third, extract the molten mixture in the extrusion granulation section: add a reagent rich in low-boiling volatile components or directly introduce gas (such as carbon dioxide or nitrogen) in the extrusion granulation section. It can reduce the concentration of peculiar smell, but it will obviously increase the production cost and production difficulty

[0007] Fourth, bake the extruded pellets: bake the extruded pellets at a high temperature (90-140°C), and use this method, which is also widely used in the modification industry, to process the PC / ABS alloy pellets. Odor can indeed meet the low odor requirements of downstream customers, but the processing conditions are harsh and energy consumption is high, which is not conducive to large-scale continuous production;

[0008] Fifth, use odor absorbers: add various deodorizers during PC / ABS alloy extrusion granulation, such as aluminosilicate, activated carbon, porous silica, porous alumina, porous molecular sieve or a combination Mixture, the PC / ABS alloy produced by this method is easy to release the odorous gas again when the temperature rises, and these inorganic deodorants are not compatible with PC resin or ABS resin, which may cause the attenuation of material properties

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