Low smell glass fiber-reinforced polycarbonate/acrylonitrile-butadiene styrene (PC/ABS) alloy and preparation method thereof

Abstract

The invention provides a low smell glass fiber-reinforced polycarbonate / acrylonitrile-butadiene styrene (PC / ABS) alloy and a preparation method thereof. The preparation method includes the following steps: weighing preparation raw materials in parts by weight, wherein the preparation raw material is prepared from 5-80 parts of polycarbonate resin, 5-80 parts of acrylonitrile-butadiene-styrene resin, 1-40 parts of glass fiber, 1-20 parts of compatibilizer, 0-20 parts of filler, and 0.2-10 parts of assistant; blending the polycarbonate resin, the acrylonitrile-butadiene-styrene resin, the compatibilizer, the filler and the assistant to obtain a mixture; feeding the mixture and the glass fiber to an extruder, and performing melting, extrusion and granulation under microwave heating conditions. The preparation method can surely avoid unnecessary over-reaction caused by local overheating, reduce decomposition of the preparation raw materials into small molecular compounds having off-odor and reduce the odor level of the alloy. The preparation method is simple in process and environmentally friendly, and does not need to additionally add assistant to reduce organic small molecules and does not affect the performance of the alloy.

Description

technical field [0001] The invention relates to the field of polymer composite materials, in particular to a low-odor glass fiber reinforced PC / ABS alloy and a preparation method thereof. Background technique [0002] Glass fiber reinforced PC / ABS alloys are widely used in industries such as automobiles, home appliances, electronics, and medical equipment. However, glass fiber reinforced PC / ABS alloys will release some odors that are unpleasant or harmful to human 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 materials. Therefore, the developme...

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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 vacuum degree during the extrusion granulation process, which is widely used in glass fiber reinforced PC / ABS alloy The processing conditions in the modification industry are demanding and require 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 glass fiber reinforced PC / ABS alloy The odor of pellets 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 deodorants, such as aluminosilicates, activated carbon, porous silica, porous alumina, porous molecular sieves or combinations, during the extrusion and granulation of glass fiber reinforced PC / ABS alloys The resulting mixture, the glass fiber reinforced 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, and may Cause attenuation of material properties

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