- Sep 15, 2018 -
More and more attention has been paid to the safety of PVC compound stabilizers. The safety of PVC composite stabilizer should be considered from three aspects: the safety of raw material processors, the safety of users and the safety of waste to the environment. The safety protection of the processors can be solved by means of liquefaction, paste and granulation of stabilizers. For the safety protection of users, the high molecular weight stabilizer or the preparation of reactive stabilizer can be used to improve its pumping resistance. However, considering that the stabilization effect is a molecular chemical reaction, the above method is not the most appropriate method, and the best method is to choose a high safety stabilizer. When choosing stabilizers, the safety of chemicals produced by the reaction between resin and stabilizer or stabilizer during stabilization must also be considered.
Judging from the safety of various stabilizers, cadmium stabilizers will be used in the near future. But one of the reasons for this slow process is that the cost of most cadmium-free stabilizers increases by 10-20% when used, and that cadmium-free stabilizers cannot be used in a wide range of PVC mixtures. If the processing area is relatively narrow, it is often necessary to use auxiliary stabilizer to compensate for its performance defects. Now the performance of cadmium-free stabilizers has reached that of cadmium stabilizers. The rapid development of calcium and zinc stabilizers. And sold in powders, pastes and liquids, as well as in standard and non-toxic grades, second-generation calcium-zinc stabilizers have replaced zinc-based tin and methyltin in food and drug packaging.
The safety of lead stabilizers is not a problem because of their small extractability, but there are safety problems that endanger the environment. Due to the low cost and high efficiency of lead stabilizers, many enterprises use this kind of stabilizers. With the development of non-lead PVC composite stabilizers, lead salts are being replaced by non-toxic environmental protection stabilizers. Lead stabilizers are being withdrawn from the market due to the ban of lead in many countries.
In short, the composite heat stabilizer is beneficial to large-scale production, and provides a new direction for the development of lead salt heat stabilizer. The content of lead is an important index of compound lead salt stabilizer. At present, the content of lead in compound lead salt stabilizer is generally 20% - 60%; the amount used in PVC plastic door and window profiles is 3.5 - 6 phr.
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