People pay more and more attention to the safety of PVC composite stabilizers. The safety of PVC composite stabilizers should be considered from three aspects, one is the safety of the raw material processor, the second is the safety of the user, and the third is the safety of the waste to the environment. The safety protection of the processor can be solved through measures such as liquefaction, paste and granulation of stabilizers. For the safety protection of users, the stabilizer can be polymerized or prepared to improve its resistance to pumping. However, considering that the stabilization effect is a molecular-level chemical reaction, the above method is not the most suitable method. The best way is to use high-safety stabilizers. When choosing a stabilizer, you must also consider the safety of chemical substances generated by the reaction between the resin and the stabilizer or the stabilizer during the stabilization process.
From the perspective of the safety of various stabilizers, cadmium stabilizers will stop using them in the near future. However, one of the reasons for a slow process is that most cadmium-free stabilizers have a cost increase of 10%-20% when used, and cadmium-free stabilizers cannot be used in a wide range of PVC mixtures. If the processing range is narrow, auxiliary stabilizers are often needed to make up for their performance defects. Now the performance of cadmium-free stabilizers has reached the performance of cadmium stabilizers. The rapid development of calcium and zinc stabilizers. And sold in powder, paste and liquid, as well as standard and non-toxic grades, the second-generation calcium and zinc stabilizers have replaced zinc-based tin and methyl tin in food and drug packaging.
The lead stabilizer has a small extractability, so the safety during use is not a problem, but there is a safety problem that is harmful to the environment. Due to the low cost and high efficiency of lead stabilizers, many companies use this. With the development of non-lead PVC composite stabilizers, lead salts are being replaced by non-toxic environmentally friendly stabilizers. Due to lead bans in many countries, lead stabilizers are withdrawing from the market
In short, the composite heat stabilizer is conducive to large-scale production and provides a new direction for the development of lead salt heat stabilizers. An important indicator of the composite lead salt stabilizer is the lead content. The lead content of the composite lead salt stabilizer currently produced is generally 20%-60%; the amount used in the production of PVC plastic door and window profiles is 3.5-6 parts