Release time:

2021-11-09

It was found that the lead salt stabilizer blended with other additives would react and generate complex phosphate with very small solubility, thus making the lead precipitation of the lead salt stabilization system significantly reduced. For example, dibasic phosphate is a widely used in PVC and other plastics and, as an absorbent of HCL, the reactant is mainly dichloro derivative, when an additive is added to the dibasic lead phosphate, the product of the chlorination reaction can be converted into a complex extremely insoluble salt. This stabilizer has been entered by the US Environmental Protection Agency into the lead salt stabilizer for toxicity purposes, and some other lead salts can also be modified by this method. This kind of lead salt stabilizer has the characteristics of low solubility, low precipitation and low migration, and when it is blended with polymer, the above performance is better. However, in view of the fact that lead salt stabilizers do have toxicity, efforts are being made to develop such stabilizers with lower precipitability. In addition, the use of dust-free composite lead salt stabilizers has an increasing trend, which provides convenience for PVC processing enterprises and reduces lead salt dust pollution in processing enterprises. Looking back on the market in recent years, the development of heat stabilizers is very fast, and there are the following trends in general: 1: Improve stabilization efficiency Improving the stabilization efficiency can not only prolong the service life of the product, but also improve the high temperature processability and reduce the amount of PVC stabilizer added. Especially in the development of some environmentally friendly stabilizers, new organic auxiliary stabilizers, such as phosphites, will be developed. It has excellent who solubility for polyolefins, polyesters and polycarbonates. In addition, it is necessary to improve the compounding technology and develop the compounding technology of weather-resistant additives and light stabilizers. Development of metal-free stabilizers to reduce the use of metal soaps, especially zinc soaps. 2: Reduce costs Improving the stability efficiency can undoubtedly reduce the cost, but people are still working hard to centralize and automate the production and develop a new variety of multi-functional PVC stabilizers to reduce the cost. At the same time, we should make full use of cheap raw materials. Such as the development of antimony stabilizer instead of tin stabilizer, because of its excellent heat resistance, only a small amount of mixing can obtain better heat resistance than tin stabilizer. Its single disadvantage is poor weather resistance. This needs to be overcome. At present, the sales of antimony products are increasing. Rare earth PVC stabilizers are a rookie in the world's stabilizer series, non-toxic, with good light and thermal stability. I have a very rich rare earth resources, should strengthen the research in this area. The research and development of composite rare earth PVC stabilizer is much better than a single component, and has broad application prospects.