Low-emission glass fiber reinforced polypropylene composite material and preparation method thereof

Abstract

The invention provides a low-emission glass fiber reinforced polypropylene composite material and a preparation method thereof. The preparation method comprises the following steps of: obtaining raw material polypropylene resin, glass fiber, compatibilizer and auxiliary agents, blending the polypropylene resin, the compatilizer and the auxiliary agents to obtain a mixture; feeding the mixture andthe glass fibers to an extruder and melt-extruding under microwave conditions. In that preparation of the composite material, the microwave is introduced into the preparation of the composite material, the heat can be ensured to penetrate into the interior of the polypropylene macromolecule and the additive molecule, the excessive overheating caused by partial overheating is avoided, thereby effectively reducing the amount of the polypropylene or the additive decomposed into the volatile organic small molecular compound when the glass fiber reinforced polypropylene composite material is produced, and obviously reducing the emission of the organic small molecules in the glass fiber reinforced polypropylene composite material; the process is simple, green and environment-friendly, and the auxiliary agents for reducing the organic small molecule are not required to be added in addition; and the performance of the glass fiber reinforced polypropylene composite material is not affected.

Description

technical field [0001] The invention relates to the field of polymer composite materials, in particular to a low emission glass fiber reinforced polypropylene composite material and a preparation method thereof. Background technique [0002] Glass fiber reinforced polypropylene composites are widely used in industries such as automobiles, home appliances, electronics, medical devices, and packaging. The modified and processed glass fiber reinforced polypropylene composites can meet the requirements of normal use in all aspects of performance. However, polypropylene composite materials, especially glass fiber reinforced polypropylene composite materials, will emit some volatile organic compounds (VOC) to varying degrees during high-temperature processing and use, especially in the It is more prominent in closed environments such as cars. When the TVOC in the car reaches a certain concentration, the driver and passengers may experience symptoms such as dizziness, headache, fa...

AI Technical Summary

Problems solved by technology

[0004] First, choose low-emission polypropylene resin and additives: When using low-emission polypropylene resin and additives, it will indeed reduce the emission of small organic molecules in the composite material to a certain extent, but in fact, the extruded pellets The content of small organic molecular compounds emitted is still relatively large and needs to be further processed

[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 polypropylene composite material modification industry The method requires harsh processing conditions and high energy consumption. At the same time, a single vacuum devolatilization device cannot completely remove easily emitted substances, so it 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 content of volatile organic small molecular compounds, 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 (110-140°C), and use this method, which is also widely used in the polypropylene composite material modification industry, to process the pellets. Odor can indeed meet the low emission 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, the use of odor absorbers: Add various deodorants during the extrusion and granulation of polypropylene composite materials, such as aluminosilicate, activated carbon, porous silica, porous alumina, porous molecular sieve or a combination Mixture, the composite material produced by this method is easy to emit small organic molecular compounds again when the temperature rises, and these inorganic deodorants are not compatible with polypropylene resin, which may cause the attenuation of material properties

Images