Development of heat stabilizers for the hottest pl

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Development of plastic heat stabilizers with the development and production of organotin and other heat stabilizers in the early 1980s, the heat stabilizer industry structure has basically taken shape. Especially in recent 10 years, the consumption of heat stabilizers in China has increased significantly with the rapid development of PVC industry. According to incomplete statistics, at present, the total annual output of heat stabilizers in China is about 80000 tons, with more than 70 manufacturers. There are 40~50 kinds of heat stabilizers that can be produced, mainly including lead salts (three salts and two salts, etc.), stearic acid metal soaps, composite stabilizers, organic tin and organic auxiliary additives. The average annual growth rate of output is about 12.5%. It is one of the fastest growing categories in the plastic additives industry, especially in the open-end materials industry

in recent years, China has also imported and exported a certain amount of heat stabilizer products, but generally speaking, China's products are not of high grade, and high toxic products still occupy the main position. The main export varieties are lead salt heat stabilizers, with an export volume of about 4000~5000 tons. At the same time, a certain amount of composite lead salts and organotin heat stabilizers need to be imported to meet the needs of the domestic plastic processing industry. The research on production technology, variety development and application of heat stabilizer is very important for the development of PVC industry. In recent years, the construction of domestic PVC production units has been rapid, which has stimulated and promoted the development of heat stabilizer industry. Some research departments and enterprises have developed many new processes and varieties

at present, the development focus of lead salt heat stabilizers in China is to eliminate powdery pollution and develop composite lead salt technology; Organotin heat stabilizers have begun to take shape in China. In addition to the 3-000t/a production plant jointly built by Beijing No. 3 chemical plant and French elf Atto company, which can produce more than 20 brands of organotin products, the 3-000t/a production plant of WANGWENZHI, a postdoctoral fellow of the Packaging Research Institute of Hunan University of technology, has also been built in Zhejiang, Shenzhen, Guangxi and other places; Shandong Zhaoyuan chemical plant has introduced American technology to build a 3000 ton/year composite metal soap device, which can produce 260 brands of composite soap products including calcium, zinc, barium and cadmium. Chengdu, Guangdong and other places also have small-scale metal soap heat stabilizer production devices; As China is rich in antimony and rare earth resources, the development of antimony and rare earth heat stabilizers has accelerated in terms of new product development of heat stabilizers. An antimony series heat stabilizer device has been built in Yiyang, Hunan, and a lanthanide rare earth composite heat stabilizer is mainly used in Changshu, Jiangsu; It is worth mentioning that the β- Diketone auxiliary heat stabilizer has been put into production, which has successfully filled the blank of efficient auxiliary heat stabilizer in China, and has positive significance for the upgrading of domestic calcium/zinc and barium/zinc composite heat stabilizers

with the gradual strengthening of global environmental protection and health awareness, plastic heat stabilizers are developing towards low toxicity, pollution-free, composite and high efficiency. The main development trends are as follows: first, alternative products of lead and cadmium heat stabilizers have been launched one after another. Due to the serious harm of lead and cadmium to human health, although there is no law and regulation that completely prohibits the use of lead and cadmium heat stabilizers in the world, since the 1990s, some industrial developed countries and regions have successively issued relevant laws and regulations restricting lead, cadmium and even barium. The research and development focus in the field of heat stabilizers in the world is the substitute products of lead and cadmium, and continue to promote their industrial production. Second, the multi-element composite "one package" products have become the market development trend. There are sometimes synergistic effects among different heat stabilizers, stabilizers, plasticizers, lubricants, antioxidants and other additives. In order to achieve ideal thermal stability and other effects, they are compounded and mixed in appropriate proportions and ways to make a composite "one package" stabilizer system, which can not only improve the stability effect, avoid the addition of plastic additives such as stabilizers and lubricants and tedious calculation process in the formulation, facilitate the use and storage of users, but also reduce resource waste and environmental pollution. "One package" products can be made into powder, granular, fusible flake and pellet. At present, the representative products in the foreign market include the series products of akcros company in the UK. Third, vigorously develop new organotin products. Organotin heat stabilizer is the best and most promising heat stabilizer for PVC at present. It causes serious air pollution in most cities. It has excellent heat stabilizer, light resistance, weather resistance and color stabilizer, and is suitable for high transparent products. Therefore, its development and research are very active at present. Its main directions are as follows: first, it improves and improves the performance of the original varieties. For example, the cyclic organotin heat stabilizer has high tin content and good stabilization effect. When it is combined with other stabilizers, it has better effect. It is a newly developed type of plastic heat stabilizer. Second, develop new organotin heat stabilizers, such as introducing benzene ring into stabilizer molecules. Thirdly, increasing the molecular weight of organotin heat stabilizer and forming polymerized organotin heat stabilizer can avoid the volatilization of small molecular heat stabilizer and improve the stability. Fourth, develop organotin products without odor. Although considerable achievements have been made in the production and development of heat stabilizers in China, there are still many deficiencies and large gaps compared with the world advanced level. First, there are few varieties and the structure is unreasonable. PVC heat stabilizers are widely studied and applied abroad, with nearly 10000 varieties, and more than 1000 brands of organotin alone. At present, there are only kinds of heat stabilizers produced on a large scale in China, and the structure is unreasonable. Lead salt heat stabilizers with high toxicity, high pollution and low grade are absolutely dominant, while the proportion of organotin is far lower than that of developed countries. Second, the production scale is small and the product quality is poor

the rapid development of China's PVC industry provides a good market guarantee and broad development space for the development of the heat stabilizer industry, and also puts forward higher requirements for the heat stabilizer industry. According to the development plan of China's plastics industry, China's demand for heat stabilizers will reach about 160000 tons in 2010. 11.10 therefore, in the future, China's heat stabilizer industry should focus on adjusting the product structure, complying with the trend of environmental protection, expanding the production scale, improving the product quality, increasing the production of calcium/zinc composite varieties and organic tin, especially the research and development of non-toxic heat stabilizers used in daily necessities. Production promotion β- Diketones, indole noise and other organic auxiliary stabilizers and dust-free composite lead heat stabilizers. The rich antimony and rare earth resources in China are used to develop, produce and popularize organic antimony and rare earth heat stabilizers

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