Unsaturated polyester resin is a composite material, which has great applications in coatings, glass fiber reinforced plastics, artificial stone and handicrafts, but the color of unsaturated resin will turn yellow, which has always been a problem that puzzles everyone. Generally speaking, there are several reasons for unsaturated resin to turn yellow: one is that during the synthesis process, due to the influence of high temperature, the resin reaches the esterification temperature, so it will turn yellow; the second is due to the influence of ultraviolet rays, this is Because of the presence of benzene rings in the resin, the aromatic compounds will undergo thermal oxygen degradation under high temperature conditions, which will cause the resin to turn yellow. In addition, the influence of additives, such as antioxidants, polymerization inhibitors and curing agents, etc., will have a certain effect on the color of the resin.
In addition to this, there are some other factors that can cause the resin to turn yellow. In general, there are two major factors that cause the resin to turn yellow, one is thermal oxygen and the other is ultraviolet. At present, we use saturated dibasic acid to replace aromatic dibasic acid, which can control the color of the resin, but it has not achieved good results in cost, performance and other aspects, so this method is not an ideal method. On the one hand, we have to isolate it from oxygen to the greatest extent during production and storage. On the other hand, we can add some antioxidants and ultraviolet absorbers to protect the resin color. The experts recommended by Kebao building materials are the use of antioxidants that do not contain amines. If you want to further improve yellow resistance, you can also add some ultraviolet absorbent scenic spots. In this way, the color of the resin can be guaranteed to the greatest extent.