Heat stabilizer is one of the important categories of plastic processing additives, the birth and development of heat stabilizer and PVC resin is synchronous. It is mainly used for PVC resin processing, so there is a close relationship between the heat stabilizer and PVC resin in PVC, the proportion of soft and hard products. At present, the global annual consumption is about 500000 tons, the main varieties are lead salts, organic tin, metal soap, compound stabilizer and organic additives, etc.. Heat stabilizer consumption structure in different countries are not the same, in the United States, composite stabilizer accounted for the total consumption of 40%-50%, organotin accounted for nearly 40%. It is the key point in the development of heat stabilizer that no cadmium, low lead, no dust and no lead salt. In order to protect the living environment of human beings, many countries have passed laws to restrict the application of toxic heavy metals in PVC processing. European PVC heat stabilizer manufacturers have made a commitment that by 2010, the amount of lead heat stabilizer will be halved and in 2015 to achieve full lead-free. Many countries in Europe are using alternatives based on organotin or calcium zinc based alternatives. The amount of lead stabilizer in Europe has been be reduced from 120 thousand tons / year in 1999 to 80 thousand tons / year in 2010. It is expected that the demand for lead - based heat stabilizers in the Asia Pacific region will also be greatly reduced. New stabilizers, including organic tin based systems (OBS), have been widely used in the United States.
