The applications of automotive plastics today are mainly divided into three categories: functional structural parts, interior trim parts and exterior trim parts. For different categories, the characteristics and use efficiency of plastic parts vary.
For functional structural parts, plastics can increase corrosion resistance, wear resistance, surface smoothness, and weight loss. For example, the engine intake manifold made of modified plastic and prepared by AIM process has many advantages compared with traditional cast iron and aluminum parts, such as 40% less weight compared with cast iron and aluminum; the inner wall is smooth, which helps to increase the intake air and good chemical resistance, effectively improve its service life.
In addition to aluminum, composite materials are also commonly used lightweight formulations for automotive structural parts. BMW used a glass fiber reinforced PP material with a ratio of nearly 30% in the front-end system of a micro-chassis vehicle to reduce the cost of parts by nearly 30%.
On exterior parts, plastic can reduce vehicle weight, reduce maintenance costs, and increase the freedom of car body design. The integrated plastic tailgate has become a boom. For example, the 1982 Citroen BX used BMC (unsaturated poly) on the tailgate. Ester plastic molding material).