A low-odor and low-emission polypropylene composite material and its preparation method

Abstract

The invention discloses a low-odor low-emission polypropylene composite material and a preparation method thereof. The polypropylene composite material comprises the following components: 60-80 partsof polypropylene; 17-23 parts of inorganic filler; and 0.1-3 parts of ethanol, wherein based on the total weight of the low-odor low-emission polypropylene composite material, the weight content of iron element is 10ppm-200ppm. The preparation method of the polypropylene composite material includes: adding polypropylene, an iron-containing compound and ethanol into a high-speed mixer for mixing, then putting the mixture into a twin-screw extruder, adding inorganic filler into the twin-screw extruder from a side feed inlet, carrying out melt extrusion, drawing, water cooling, granulation, drying and bagging, then performing drying in a drying tank, and turning over the materials every 2-4h. Specifically, the twin-screw extruder has a three-vacuum design, the vacuum degree is controlled lessthan or equal to 0.05bar, and the twin-screw extruder head is equipped with a filter net to remove large particle impurities. According to the invention, the polypropylene composite material has obviously improved low-odor emission properties, at the same time can maintain good mechanical and thermal properties, and can be widely applied to automotive interior parts.

Description

technical field [0001] The invention relates to the field of polymer materials and their molding processing, in particular to a low-odor and low-emission polypropylene composite material and a preparation method thereof. Background technique [0002] Automobile air conditioner shell is an extremely important functional part under the hood of the automobile engine. The temperature of the working environment changes greatly, and the circulating gas directly passes through the interior space of the car. It has high requirements on mechanical strength, especially heat resistance, odor and emission characteristics. Very demanding. [0003] At present, China's automobile industry is developing vigorously with a big stride, and consumers' demand for automobile comfort and health is increasing day by day. The national GB / T27630-2011 "Guidelines for Air Quality Evaluation in Passenger Cars" clearly stipulates the upper limit of benzene, aldehydes and ketone organic volatiles, and th...

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Problems solved by technology

Traditional air-conditioning shell materials are injection-molded with composite materials of polypropylene, talcum powder, thermoplastic elastomers, and antioxidants, which can easily meet the basic mechanical strength and injection molding requirements, but the above-mentioned composite materials will emit a strong odor of organic volatiles. Even if porous minerals are added to the raw materials of the above-mentioned air-conditioning shells as adsorbents, the effect is still not good, and the air quality in the car is still not up to the standard of GB / T27630-2011 "Guidelines for the Evaluation of Air Quality in Passenger Cars" due to the organic matter emitted by plastics

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