| abstract |
The invention belongs to the technical fields of automotive material, provide a kind of polyurethane shape memory bumper and preparation method that EVA is modified.When this method prepares polyurethane as raw material progress chemical polymerization using polyether polyol, isocyanates, the co-implanted mold for placing metallic framework is mixed with ethylene propylene diene rubber, ethylene-vinyl acetate (EVA) heat, cross-linking radiation is carried out after taking-up in maturing process, the modified polyurethane shape memory bumper of EVA is made.It is compared with the traditional method, the bumper of preparation of the invention, by the modification of EVA resin, bumper shape memory function is imparted, shape recovery rate is high, shape-memory properties are excellent, and there is excellent impact resistance, elasticity is good, and safety is good, it can effectively absorb and mitigate foreign impacts power, protection vehicle body, vehicle drive safety can be obviously improved. |