Polypropylene modified composite material automobile bumper

Abstract

The invention discloses a polypropylene modified composite material automobile bumper which is made of materials including polypropylene, bis (p-hydroxyphenyl) phenyl phosphine oxide, metallocene polyolefin elastomer, nylon, maleic anhydride, thermoplastic polyurethane, acrylonitrile-butadiene-styrene, ethylene propylene rubber, polyethylene, shear thickening fluids, poly (m-phenylene isophthalamide) fibers, antistatic agents, antioxidants, dispersing agents, plasticizers and ultraviolet absorbents. The materials of the bumper are fine in flowability and easy to process and avoid deform and post-shrinkage even if the materials are used in a high-temperature high-humidity environment, shrinkage is effectively reduced, and other mechanical performance indexes of polypropylene automobile materials can be met. Compared with existing bumper materials, bending modulus, tensile strength, hardness and melt flow rate are greatly increased.

Description

technical field [0001] The invention relates to the field of auto parts materials, in particular to a polypropylene modified composite auto bumper. Background technique [0002] PP is a semi-crystalline material. It is harder and has a higher melting point than PE. Because the homopolymer PP temperature is very brittle below 0C, many commercial PP materials are random copolymers with 1 to 4% ethylene or clamp copolymers with higher ethylene content. Copolymer PP materials have a low heat distortion temperature (100C), low transparency, low gloss, and low rigidity, but have stronger impact strength. The strength of PP increases with the increase of ethylene content. The Vicat softening temperature of PP is 150°C. Due to the high degree of crystallinity, this material has very good surface stiffness and scratch resistance properties. PP does not have environmental stress cracking problems. Usually, PP is modified by adding glass fibers, metal additives or thermoplastic r...

AI Technical Summary

Problems solved by technology

At present, most of the materials used for bumpers have problems such as poor shrinkage control, low paint adhesion, poor weather resistance, poor toughness, unsatisfactory impact resistance, small elongation at break and low thermal deformation temperature.

Chinese invention patent application CN1566196A discloses a new type of polypropylene composite material, which is composed of the following components by weight: copolymerized polypropylene pellets 25-60, thermoplastic elastomer 5-20, high-density polyethylene 0-20, Mineral filler 0-40, polar polymer material 0-10, anti-heat oxidant 0.1-0.6, coupling agent 0.1-0.3, light stabilizer 0.1-0.3, which have strong adhesion, but the volume change of the material is relatively small Large, poor impact resistance; and poor fluidity during molding, complicated preparation process

Chinese invention patent CN1235989A discloses a paintable modified polypropylene composition, which contains 100 parts of polypropylene, 10-50 parts of rubber-type toughening agent, 5-15 parts of oligomer, 5-20 parts Parts of grafted modified polypropylene, 1-15 parts of inorganic fillers, which are uniformly mixed with the above-mentioned various materials in proportion, melted and blended at a processing temperature of 180-220°C, and then extruded into pellets or internal mixer It is produced by granulation; the impact strength of the composition prepared by the above method is up to 629.6J / m, and when it is used as a material for preparing automobile bumpers, its impact strength is not high enough to absorb more impact energy , thereby reducing the safety performance of the car