Automobile bumper

Abstract

The invention discloses an automobile bumper which is made of materials including polypropylene, bis (p-hydroxyphenyl) phenyl phosphine oxide, thermoplastic polyurethane, ultrafine magnesium hydroxide, polyamide, acrylonitrile-butadiene-styrene, ethylene propylene rubber, polyethylene, shear thickening fluids, poly (m-phenylene isophthalamide) fibers, antistatic agents, antioxidants, dispersing agents, plasticizers and stabilizers. The materials of the bumper are low in shrinkage, high in flowability, fine in weather resistance and fine in paint performance, and have the advantages of high flexibility, strength, breaking elongation and heat distortion temperature. The bumper cannot fracture when an automobile is slightly collided. Compared with existing bumper materials, bending modulus, tensile strength, hardness and melt flow rate are greatly increased, and low-temperature impact resistance and chemical resistance are remarkably improved.

Description

Technical field [0001] The invention relates to the field of auto parts materials, in particular to automobile bumpers. Background technique [0002] PP is a semi-crystalline material. It is harder than PE and has a higher melting point. Since homopolymer PP is very brittle when the temperature is below 0°C, many commercial PP materials are random copolymers with 1 to 4% ethylene or clamp copolymers with higher ethylene content. Copolymer PP material has lower thermal distortion temperature (100°C), low transparency, low gloss, low rigidity, but has 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 crystallinity, the surface stiffness and scratch resistance of this material are very good. PP does not have the problem of environmental stress cracking. Usually, the PP is modified by adding glass fiber, metal additives or thermoplastic rubber. The flow rate MFR of PP ra...

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

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