Low-odor ABS (Acrylonitrile Butadiene Styrene) composition and preparation method thereof

Abstract

The invention provides a low-odor ABS (Acrylonitrile Butadiene Styrene) composition and a preparation method thereof. The preparation method comprises the following steps: weighing preparative raw materials in parts by weight, and blending the raw materials to obtain the mixture, wherein the preparative raw materials comprise 5-100 parts of ABS resins, 0-40 parts of fillers and 0.2-10 parts of additives; feeding the mixture into an extruder, and melting, extruding and granulating under microwave heating conditions, thereby obtaining the low-odor ABS composition. The microwaves are introduced into preparation of the ABS composition, so that the heat can penetrate into ABS macromolecules and additive molecules, the unnecessary over-reaction caused by local overheating is avoided, the amountof the ABS or additives decomposed into odor-containing small molecule compounds during production of the ABS composition is further effectively reduced, and the odor level of the ABS composition is obviously lowered; the process is simple, green and environmental-friendly, and extra additives capable of reducing small organic molecules do not need to be added; and the performance of the ABS composition is not influenced.

Description

technical field [0001] The invention relates to the field of polymer compositions, in particular to a low-odor ABS composition and a preparation method thereof. Background technique [0002] ABS materials are widely used in industries such as automobiles, home appliances, electronics, and medical equipment. However, during use, especially in high temperature environments, ABS compositions will release certain odorous or harmful substances to human health to varying degrees. odor. 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, devel...

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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 degree of vacuum during the extrusion granulation process, which is widely used in the ABS composition modification industry The method requires harsh processing conditions and high energy consumption. At the same time, a single vacuum devolatilization device cannot completely remove odors 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. On the other hand, the odor concentration can be reduced, 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 treat the odor of the ABS composition pellets. It can indeed meet the low-odor requirements of downstream customers, but the processing conditions are harsh and the energy consumption is high, which is not conducive to large-scale continuous production;

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

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