A kind of easy-spraying polypropylene composite material and its preparation method and application

Abstract

The invention relates to an easily-sprayed polypropylene composite material which can be used for automobile parts and a preparation method and application thereof. The easily-sprayed polypropylene composite material is mainly prepared by mixing the following ingredients (by weight): 40-65 parts of polypropylene, 10-18 parts of a thermoplastic elastomer, 0-3 parts of polyethylene, 0-3 parts of a polar copolymer, 20-30 parts of a mineral filler and a few amount of an anti-oxidant, a light stabilizer and other functional aids. The preparation method comprises the following steps: successively adding polypropylene, the thermoplastic elastomer, polyethylene, the polar copolymer, the mineral filler, the anti-oxidant, the light stabilizer and other functional aids into a low speed mixer and mixing for at least 2 min; adding the mixture into a twin-screw extruder and mixing, setting the extrusion temperature to be 170-240 DEG C, extruding and granulating, and uniformly mixing to obtain the product. The easily-sprayed polypropylene composite material can be used for preparation of automobile bumper products and has comprehensive properties such as excellent impact resistance, fluidity, rigidity, heat stability, dimensional stability, sprayability, etc.

Description

technical field [0001] The invention belongs to the technical field of organic polymer composite material and its preparation, and in particular relates to a polypropylene composite material and its preparation method and application. Background technique [0002] With the rapid development of the automobile industry at home and abroad, resource and environmental issues have become increasingly prominent, and the application of lightweight materials in automobiles has become a research hotspot. Automobile bumper materials must not only have excellent impact resistance, fluidity, rigidity, thermal stability, and dimensional stability, but also have good sprayability. However, most of the current automobile bumper materials cannot meet these comprehensive performance requirements at the same time. . [0003] Polypropylene has the advantages of high strength, low density, heat resistance, chemical resistance, and wide processing temperature range. It has been rapidly applied a...

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Problems solved by technology

[0004] The Chinese patent document with the publication number CN 103087593A discloses an easy-to-spray polypropylene compound and its preparation method. Toughener 2%-10% for olefin copolymerization, 0-25% reinforced inorganic material and 0.3-1.5% additive, the processing temperature is 180°C-230°C, extruding through a twin-screw extruder according to a certain feeding sequence The product obtained by granulation has a melt index of 7.7-10g / 10min, a tensile strength of 23-25MPa, an elongation at break of 15%-30%, and an Izod notched impact strength (23°C) of 8.5-10kJ / m 2 , coating film adhesion is grade I, this material has high strength and excellent sprayability, but poor fluidity and impact performance, it is not suitable for the production of bumper products with complex mold structure design

[0005] The Chinese patent document with the publication number CN 101838423A discloses a modified polypropylene material for thin-walled bumpers and its preparation method, which uses high-melting index copolymerized polypropylene to improve the flow properties of the material, and through a certain ratio of toughening The balance of rigidity and toughness of the material can be achieved by using additives and mineral fibers, but the thermal deformation temperature of the material is low, which cannot meet the thermal stability of bumper products in high temperature environments

[0006] It can be seen from the above that the existing technology still cannot meet the higher requirements for the comprehensive performance of automobile bumper products. It is necessary to develop a car with excellent impact resistance, fluidity, rigidity, thermal stability, dimensional stability and sprayability. Accessory materials and supplies have become a major technical problem in this field

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