The study found that mix the lead salt stabilizer and other auxiliary will happen a reaction and generate compound phosphate with minimum solubility, thus lead precipitation of lead salt stabilizer decreased significantly. For example, dibasic phosphate is a kind of widely used in PVC and other plastics, as the absorbent of hydrogen chloride; the reaction was mainly two chloro derivatives, when adding an additive to the two basic lead phosphates, the product two chloro two basic lead phosphate chlorides into compound very difficult soluble salt. This stabilizer has been lead salt stabilizer USA Environmental Protection Bureau of entry to the toxicity of lead salt orders, but the other was modified by this way. This kind of lead salt stabilizer has low solubility, low precipitation and low mobility characteristics, and when the polymer blend, the better performance. But considering the existence of the toxicity of lead salt stabilizer, HALS so people are trying to develop precipitating lower.
In addition, the use of dust-free composite lead stabilizers a trend of increase, the use of PVC processing enterprises to provide a convenient, while reducing the processing enterprises lead salt dust pollution.
1. To improve the stability performance
To improve the stability performance can not only extend the service life of the products, but also can improve the high temperature processing, reduce the amount of PVC stabilizer. Especially in the development of some environmental protection of stabilizer, the development of organic auxiliary stabilizer model, such as phosphite. It is who dissolved, excellent for polyolefins, polyesters and polycarbonates. In addition, there are to improve the combination technology, creating quality products, the development of weather resistant agent and light stabilizer technology. The development of non-metal stabilizer, reduce metal soap, especially the use amount of zinc soap.
2. Reduce the cost
To improve the stability performance, it can reduce the cost, but people still continue efforts, the centralized production, automation, development of a good PVC stabilizer agent more new varieties, in order to reduce the cost of. At the same time, it also should make full use of cheap raw materials. Such as the development of antimony stabilizer to replace the tin stabilizers, because of excellent heat resistance, with a small amount of heat resistance can be obtained only than tin stabilizers better. But its shortcoming is the poor weather resistance, which need to be overcome. The antimony product sales are increasing, the rare earth stabilizer PVC is one of the world's stabilizer series in a rookie, and pollution-free, non-toxic, has good optical, thermal stability. Rare earth resources are very rich in China; we should strengthen the research in this area. Composite rare earth stabilizer PVC recent research development of the effect than single component is much better, and has a broad prospect of application.
