As a wide range of composite materials, unsaturated resin is widely used in coating, FRP, artificial stone, artifact and other fields. Due to the effect of high temperature, unsaturated resin in the finished product will have some special conditions, such as yellowing problems. What's going on here?
Generally speaking, the temperature in the resin synthesis process is generally about 180 degrees to 220 degrees. Under the condition of temperature rise, the color of unsaturated resin will age rapidly, resulting in yellowing phenomenon, which brings a lot of influence on the external image of resin products.

Resin this kind of material if exposed to ultraviolet light, will lead to yellowing, the main reason is that it contains benzene ring, because aromatic compounds in the manufacturing, the temperature is higher and lead to the thermal oxygen phenomenon continues to slow down, at this time is likely to cause resin yellowing phenomenon.

Unsaturated resin in the production and packaging process, due to the tightness of the device is not tight enough, resulting in raw materials and oxygen contact, unsaturated polyester molecular chain not only contains esters, hydroxyl, but also contains double bonds and aromatic rings, trace oxygen can make its thermal oxidation degradation, but also yellow problems.

Another possibility is that the effects of additives, such as antioxidants, polymers, curing agents, etc., all have their own colors, which will affect the color of the resin to varying degrees, and finally appear yellow problems.

Therefore, according to the causes of unsaturated resin yellowing, we can find solutions for the corresponding problems to reduce yellowing. For example, in the production and storage process can be filled with inert gas as far as possible to isolate the contact with oxygen, there is a more effective method, is to add antioxidants and UV absorbent, can effectively prevent and delay the yellowing of polyester. For more solutions, you are welcome to consult Jiangyin Qianqian Chemical Co., LTD. - a professional composite material problem solving provider. Our main sales products are resin, glass fiber, additives and other composite products, rich experience, after sale worry-free!