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PVC thermal stabilizer market and development.
The world USES 850,000 t a year of thermal stabilizers, 70 % of which are used in PVC production. At present, the global demand for PVC continues to rise, and it is estimated that the use of PVC will reach 35 million t in 2010, and the market of thermal stabilizer will increase accordingly. Because of different national conditions, the consumption structure of thermal stabilizer is different. For example, in the American thermal stabilizer consumption structure, the compound stabilizer accounts for about 45 % of the total, and the organic tin class accounts for about 40%.
Lead salts account for about 15%; Japan is still dominated by lead salt, accounting for more than 50 %, and the compound is about 30 %, and the organic tin is about 12 %. The consumption structure of thermal stabilizer in Western Europe is similar to that of Japan. At present, the production of thermal stabilizer in China is about 90,000 t/ a, with lead salt accounting for 36 %, stearate accounting for 34 %, organic tin as 5 %, compound liquid as 11 %, and other 14 %.
Research and development in the field of heat stabilizer in the world is a hot spot for the replacement of lead and cadmium. Enter since the 1990 s, due to the global demand for environmental protection is becoming more and more strict, the limit of heavy metals stabilizer regulations, make the production and consumption of heat stabilizer further to develop in the direction of non-toxic, low toxicity, composite efficient, lead-free, no cadmium has been paid attention to by the developed countries, caused by substitute products appear constantly, and application of lead, cadmium cadmium) (especially the application of stabilizers are the decline gradually. But despite some countries in environmental pollutants set restrictions on the use of special brand products, is also introduced based on calcium/zinc stabilizer as alternatives, but the stability of system is much complicated, and due to the need to add organic stabilizer, its price is very difficult to compete with lead salt stabilizer. As a result, lead stabilizers will continue to dominate the world market for a long time. At present, the average ratio of lead salt stabilizer to the replacement stability system is 8:2. In the future, it will replace the heavy metal stabilizer system which is the dominant position in the market. It is predicted that by 2010, the use of lead stabilizers will be less than 80,000 t.
Global market is mixed metal stabilizer protecting resources or the direction of "green" alternative, through constant technical progress and product improvement, efficient calcium/zinc stabilizer, calcium/barium/zinc stabilizer and rare earth stabilizer is expected to replace the existing mixed metal products. The trimetal stabilizer system can reduce the use of heavy metal and phenolic products and improve the overall efficacy. Barium/calcium/zinc mixed stabilizers, which are based on novel calcium and barium intermediates, are competitive in both cost and performance. In recent years, rare earth stabilizer has been used as a domestic high speed development product, and it is replacing the lead salt stabilizer in the field of pipe and special-section, which greatly reduces the lead content in these PVC products.
Multivariate composite "packaging" type products become the trend of the development of the market, between the different heat stabilizer, stabilizer, plasticizer, lubricant, antioxidant and other additives, and optimization of composite mixed in certain proportion, made from composite "packaging" type stabilizer system, not only can create synergies and improve the effect of thermal stability, the solving formula stabilizer and lubricant additives added inaccuracy and troublesome problems, but also can reduce resource waste and environmental pollution, easy to use and storage.
At present, the research and development of foreign thermal stabilizers are mainly manifested in 5 aspects:
The composite packaging is adopted to improve the economy and efficiency of the stabilizer.
The use of non-toxic natural resources to improve its environmental protection;
Adopt "one-bag" package to improve operability;
The use of chemical compound to improve its functionality;
Chemical modification was used to improve its efficacy.
Now, our country in the field of heat stabilizer, in addition to the research and production of rare earth stabilizer, the bigger progress in general, not only single variety, performance is poor, with foreign gap is very big, has seriously restricted the ability to compete with foreign manufacturers in China.
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