Non-toxic PVC heat stabilizers situation and development trend

Abstract: This paper analyzes the domestic non-toxic PVC heat stabilizers situation and Development trend, summed up the production of PVC heat stabilizers, there are some problems, mainly in small scale, fewer species, the structure is unreasonable, and that its future Development direction.

Keywords:: PVC; non-toxic heat stabilizers; domestic situation; Development
Abstract: The domestic present status and Development of the non-toxic PVC heat stabilizers were analyzed in this paper. We also discussed some problems in the production of PVC heat stabilizers, such as small scale, less variety and irrational structure and pointed out the future of Development direction.

Keywords:: PVC; non-toxic heat stabilizers; domestic present status; development

Polyvinyl chloride (PVC) is second only to polyethylene production (PE) of the common plastic, with self-extinguishing, flame retardant, wear-resistant, high strength, electrical insulation and good chemical stability, etc., and the price is low, widely used in industry, agriculture, national defense and construction and other fields, but the special structure of PVC, PVC at high temperatures and high shear processing conditions, easy off the HCL molecule caused by the degradation of polymer products for its color and products, mechanical properties decreased, affecting their life, so you need to add stabilizer to increase its stability.

Traditionally, PVC heat stabilizers are: lead salt, organic metal soaps, organic tin compound stabilizers, organic heat stabilizers and so on. With the expansion of application fields of chemical building materials, in particular, profiles, tubes and The rapid increase in the amount of sheet metal, etc., the demand for PVC will increase substantially. the ratio of specific consumption: about 40% of the lead salt type, about 10% stearic acid salts, organic tin about 15%, rare earth about 8%, Ca / Zn compound stabilizer for about 25%, other 2%.

1PVC heat stabilizers situation and development trend
In recent years, with the growing environmental awareness around the world to strengthen, lead salt heat stabilizers will be replaced by non-toxic products, and now lead salt heat stabilizers in China's development priorities is to eliminate the dust, the development of lead salt compound Technology. Representative results are in Nanjing, Wenzhou, Chongqing, clean lead salt production base established. Most of the products of these enterprises with the lipids through the lubricant manufacturing, product to replace the traditional powder and flake powder, a better solution measurement of dust pollution and the difficulty of the problem. but such stabilizers because of the RoHS Directive and the EUP Directive and China on Technical Barriers to increasing the impact of environmental requirements, decline in market share will continue to .20 after the 80 century, heat stabilizers in Technology relatively slow progress on, but the Research in environmental protection is quite active. European Parliament and the European Commission in February 13, 2003 on its official website RoHS and WEEE Directive, RoHS Directive was July 1, 2006 the official implementation of all the products sold in EU countries must comply with EU RoHS directive specification, prohibit the use of electrical and electronic equipment containing lead and cadmium and other elements of the material. Europe is growing to replace lead salt, the Nordic countries, pipe manufacturers have committed Alternative lead salt. The EU asked the European countries in January 1, 2008 to replace the toxic effect of lead salt, cadmium salt in the electrical and electronic equipment application. Back in 2003, the Netherlands plans to completely replace the 2004 class of stable lead salt agent, the British developed strictly Migration of lead salts in water and even cancel the use of lead salt type stabilizer. 25% of the wire and cable in Europe and 10% of the PVC-U products, heat stabilizers used in class from the lead salt stability Agents turn to Ca / Zn heat stabilizer In 2003, China began to concern the toxicity of PVC processing aid issues in 2004, the Ministry of Construction in the announcement made clear that: a nationwide PVC-U pipes for water supply shall be stable class of disabled lead salt agent. nontoxic, pollution-free, complex and efficient Research and development has become the trend of PVC additives. We analyzed several types of non-toxic heat stabilizers status and development trends:
1.1 Rare Earth Heat Stabilizer
Rare Earth Heat stabilizer is developed in recent years a new type of heat stabilizer, based on rare earth oxides and chloride-based single compounds or mixtures. With non-toxic, efficient, versatile, affordable, etc., suitable for soft , rigid and transparent and opaque PVC products. At present, Guangdong Guang Yang Technology Co., Ltd. is the largest manufacturer of rare earth thermal stabilizer, the production scale of 8 000 t / a. Furthermore, chemical synthesis, Zhejiang, Guangdong Zhaoqing Ding Lake has fine production.

1.2 The heat stabilizers of organic antimony
Antimony organic heat stabilizers also developed rapidly in China in recent years, a non-toxic thermal stabilizers, thermal stability, effectiveness and transparency of its Type is not such as organic tin, but the price is much lower organic tin stabilizer, but also has itself is unstable and easily decomposed, storage difficulties and resistance to UV light of other shortcomings. At present, antimony stabilizer developed mainly for its three main components of antimony and antimony compound stabilizer. its thermal stability than Ca / Zn Compound Heat Stabilizer for PVC has good long-term thermal stability, but will also prevent the early stages of coloring products. of antimony rich in resources, the development prospects of organic antimony stabilizer, while non-toxic organic antimony stabilizers, thermal stability, high efficiency, Therefore, the development of the organic antimony stabilizer is being more and more attention. Yiyang, Hunan manufacturers mainly nitrogen fertilizer plant.

1.3 hydrotalcite heat stabilizers
Hydrotalcite-like thermal stability of Japan in the 20th century developed a class of 80 new secondary inorganic PVC stabilizer, the thermal stability of better than barium soap, calcium soap, and their mixture of good. Have good transparency, good insulation, weather good and the processing advantages and good, without sulfide pollution, non-toxic, with soap and organic tin, zinc heat stabilizer from the synergies, is very promising development of a class of non-toxic auxiliary heat stabilizer. to hydrotalcite, zeolite as a secondary stabilizer. Germany, Japan, Korea and other countries have their own brand of goods sold hot stabilizer, China Dalian Rich Metal Company Limited and Jiangsu Yixing Auxiliary plant using the patented Technology Beijing University of Chemical Technology, also began production and sales of hydrotalcite thermal stabilizer. hydrotalcite thermal stabilizer for the complex technology and Research is the rise at home and abroad. reposted elsewhere in the Research Papers Download http://www.hi138.com 1.4 Ca / Zn compound stabilizer
As lead and cadmium as a heavy metal, has a serious hazard to human health, the world in recent years the field of Research and development of heat stabilizer is a hot lead, cadmium alternative products, and continue to advance its industrial production.

Currently, the world's largest manufacturer of thermal stability Baerocher company's newly developed varieties are non-toxic thermal stabilizer: MC-KA41, MC-KA60 Solid Ca / Zn stabilizer for cable; MC-8367KA is a kind of Calcium / lead / zinc as the main body of the high heat stabilizers and lubricants; MC8369KA series with a stable dual role of agents and lubricants, and the higher cost.

Chi Hai Industrial Co., Ltd. Shenzhen AIMSTA6800 series of calcium / zinc composite stabilizer products, successfully replaced the lead salt stabilizer used in wire and cable market; Hangzhou clover Research and development of liquid additives Limited Ca / Zn composite stabilizer, barium can replace Cadmium stabilizers used in PVC soft class products; Zhejiang Science and Technology Co., Ltd. laborers Hepton Himpton1086L series of calcium / zinc composite stabilizer, can be used in injection molding of rigid PVC products. the current global lead and cadmium stabilizers limit a faster pace and significant price increases lead salt stabilizer for the promotion of alternative products provide a good historical opportunity. But as the traditional lead salt stabilizer cheap and efficient primary heat stabilizer products, in many ways irreplaceable advantages, will be in a certain period of time, in the field of thermal stability still dominant.

1.5 Organic tin heat stabilizer
Organotin PVC stabilizer is one of the best thermal stability, the advantages are: �� overall performance than other more widely used stabilizer good for high temperature processing, such as extrusion and rolling processing, the highest temperature up to 200 �� ~ 230 ��; �� good weather resistance, suitable for outdoor products used; �� excellent transparency, no bleaching, but also can be used as a transparent bright coloring products; �� good compatibility with PVC, long-term use not precipitate; �� low toxicity, can be used for food, medicine packaging PVC products and in the water pipe; �� processing flow is very good, non-stick rollers, not scaling. drawback is that manufacturing costs are high, so sales prices are high, and there is a certain smell.

Organotin stabilizers now beginning to take shape in China's manufacturing enterprises are: Arkema Beijing Chemical Co., Ltd. 5 000 t / a production plant can produce more than 20 brands of organic tin products, the main variety is octyl tin mercaptide ; Zhejiang Hepton Chemical Technology Co., Ltd. 5 000 t / a methyl tin production line of heat stabilizers; Hubei D Star Chemical Co., Ltd. has a 2 000 t / a production plant, production of methyl mercaptan tin.

Organic tin heat stabilizer in the direction of development and research have the following main aspects: �� the development and promotion with Sn-S bond of the organic tin compounds. These compounds are thiosulfate acid and thiols two, thio acid class of organotin can reduce the corrosion of metals, with anti-consider the nature of human toxicity is extremely small, allowing for food grade PVC heat stabilizers. thiol organic tin, not only has good thermal stability, light transmission is also very , and can be used for the field of optical materials; �� non-toxic, odorless organic tin product development; �� Development of complex multi-functional organotin heat stabilizer is an organic tin heat stabilizer is another big trend. organic stabilizers used alone without help of any stabilizing effect, however, and with the use of organotin stabilizers to play a good synergy.

Problems and recommendations 2
Overall, our production and development of thermal stability has made certain achievements, but with the world advanced level, there are still many deficiencies and gaps:
2.1 varieties and small in scale
PVC heat stabilizers research applications in foreign countries are more concerned for varieties, nearly one million, only 1 in 000 tin machine class, and our large-scale production of only 50 to 60 species, the dominant type of lead salt , and organic tin stabilizers are far less than the proportion of the level of developed countries.

2.2 The structure is irrational, poor product quality
The production of thermal stability of poor quality, there are many small workshops, inconsistent quality of the thermal stability of production and market.

3PVC direction of development of heat stabilizers
With the PVC industry, China's new development after another heat stabilizer, but due to historical reasons, the new thermal stability of the production and application is far from meeting China's PVC industry, the future of heat stabilizer industry should focus on the adjustment of product structure, comply with the trend of environmental protection, expanding production scale and improve the industry concentration, increased calcium / zinc composite varieties and organic tin production, the use of rare earth rich in resources, production and promotion of rare earth stabilizer. especially in the development and production of multifunctional , composite, efficient, non-toxic, odorless heat stabilizer. Links http://www.hi138.com Research Papers Download