Today's application in real life is very common. However, many undesirable conditions often occur during the manufacture of unsaturated resins, especially due to the effect of high temperature, which causes heat aging and gradually turns yellow. Occurred, generally speaking, during the compounding process, the main temperature of the resin is generally around 180 degrees, or around 220 degrees. Of course, in some cases, this kind of temperature change is encountered. In the case of high temperature, it may become higher, and below this temperature, the color of the unsaturated resin will rapidly deteriorate, which in turn leads to yellowing, which brings a lot to the external image of the resin product. The impact of the resulting unsaturated resin problem.
Among them, if it is a resin material, if it is exposed to ultraviolet rays, it will cause yellowing. This is mainly due to the presence of benzene rings in it, and the main factor is because of aromatic compounds. When the ingredients are manufactured, the phenomenon of higher temperature leads to the continuous reduction of the thermal oxygen phenomenon. At this time, it is likely that the resin will yellow.
At the same time, during the manufacture of unsaturated resins, due to the lack of tightness inside the device, the raw materials are occasionally exposed to oxygen, and the general unsaturated polyester molecules such as fat groups etc. A type of substance also contains dust seals such as double bonds. Therefore, if there is a decrease in thermal oxygen, it will cause the value to turn yellow.