Generally speaking, the yellowing of plastic products is caused by the aging or degradation of materials. Generally, PP is caused by aging (degradation). Due to the existence of the upper side group of polypropylene, its stability is not good, especially in the case of light. Generally, light stabilizers are added. As for PE, because there is no side base, there is not a lot of yellowing at the initial stage of processing or use. PVC will turn yellow, which has a great relationship with the formula of the product
To put it bluntly, it is oxidation. The surface of some masterbatch is easy to be oxidized, so it is necessary to carry out surface treatment on masterbatch.
In addition to the bad additives and impurities in the system, I think it is mainly caused by aging. Adding appropriate antioxidant system and anti ultraviolet agent can improve the yellowing of PE and PP, but many hindered phenolic antioxidant systems will bring slight yellowing. In addition, some antioxidant systems and anti ultraviolet agents have resistance effect, so we should be very careful when using them. By adding polymer lubricant, a kind of flowing polymer fluoropolymer film can be formed on the machine wall, which can improve the extrusion processing performance, extrusion pressure and processing temperature of polyolefin resin, improve the product quality and production capacity, reduce the production cost, reduce or eliminate the melt fracture, and reduce the scrap rate.
About JasonMould Industrial Company Limited
Jasonmould is a China mold maker of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer, mold manufacturer China– plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.
Contact:
Person: James Yuan
Company: JasonMould Industrial Company Limited
Add: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong Province, China
Tel: 86-752-6682869
Email: [email protected]
Site: https://www.jasonmolding.com/custom-injection-molding/
