Generally, the yellowing of plastic products is caused by the aging or degradation of materials. Generally, PP is produced by aging (degradation). Due to the presence of the side groups on the polypropylene, its stability is not good, especially in the light. In case. Light stabilizers are generally added. As for PE, since there is no side base, there is not much yellowing in general processing or initial use. PVC will turn yellow, and the formula of the product is relatively large. To put it bluntly, it is oxidized. Some masterbatch surfaces are easily oxidized, and it is necessary to surface-treat the masterbatch.
In addition to the bad additives and impurities in the system, I think it is mainly caused by aging. Adding suitable anti-oxidation system and anti-UV agent can improve the yellowing of PE and PP, but many hindered phenolic antioxidant systems will Bring a slight yellowing, and some anti-oxidation systems and anti-UV agents have resistance, so be careful when using them. Adding a polymer lubricant mainly allows it to form a movable polymer fluoropolymer film on the machine wall, improving the extrusion processing performance, extrusion pressure and processing temperature of the polyolefin resin, and improving product quality and productivity. Reduce production costs, reduce or eliminate melt fracture, and reduce scrap rate.
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