Requirements for automotive plastic parts

Excellent weather resistance to ensure no discoloration, aging and cracking after long-term use (including thermal oxidation aging and light aging);

Good chemical resistance, resistant to the corrosion of oil products and daily chemicals;

Moulding property: sufficient fluidity for injection molding materials to ensure the molding of complex parts and improve production efficiency;

Economical, requiring high cost performance of materials.

Material requirements for exterior decoration

Weather resistance: weather resistant materials, such as AES, ASA (AAS), PC/PBT (PET), etc., It shall be selected for unpainted or plated parts;

Heat resistance: due to low ambient temperature, the standard heat resistance level can meet the requirements;

Low temperature resistance: the material is required to have a certain low temperature resistance to prevent cracking of components under low temperature environment in winter;

Chemical resistance: prevent the corrosion of oil products and acid rain;

Scratch resistance: the material is required to have a certain surface hardness and low friction coefficient to prevent scratches.

Material requirements for interior trim

Auto parts manufacturer

Heat resistance: due to the long sunshine time in summer and high temperature in the car, the interior materials are required to have high heat resistance;

Anti aging: including thermal oxidation aging and light aging to prevent aging, discoloration and deterioration of components;

Odor: For the health of drivers and passengers, the materials shall be low in volatility and odor;

Matte: To ensure driving safety, choose matte materials or matte leather lines;

Scratch resistance: the material is required to have a certain surface hardness and low friction coefficient to prevent scratches and fuzzing.

On the premise of not affecting the appearance and use of the plastic parts, the plastic parts shall be designed to meet the following requirements as far as possible. (1) The metallic luster will make the original shrinkage more obvious. Therefore, the uneven wall thickness of the product should be avoided to avoid shrinkage. The wall thickness should be moderate to avoid too thin (less than 1.5 mm), otherwise it will cause poor rigidity, deformation during electroplating, poor adhesion of the coating, and deformation during use, which will cause the coating to fall off. (2) Avoid blind holes, or the residual treatment solution in the blind holes will not be easy to clean, which will pollute the next process and affect the electroplating quality. (3) The electroplating process has sharp edges and thickening. Sharp edges in electroplating can cause electric discharge, leading to coating bulge at corners. Therefore, round corner transition shall be adopted as far as possible, and the radius of round corner shall be at least 0.3mm. It is difficult to electroplating flat plastic parts. The middle part of the plated parts is thinner, and the thicker the plated parts are closer to the edge. The whole plated parts are uneven. The shape of the flat plate shall be changed to a slightly arc shaped or a matte surface made of orange peel. The larger the electroplating surface area is, the greater the difference between the glossiness of the middle and the edge is. A slight paraboloid can improve the glossiness uniformity of the electroplating surface.