Rare Earth Stearates as Thermal Stabilizers for Rigid Poly(vinyl chloride)
来源期刊：JOURNAL OF RARE EARTHS2005年第2期
论文作者：Cai Weilong Fu Minglian Zhang Xing Wang Canyao Zheng Yuying
Key words：poly(vinyl chloride); thermal dehydrochlorination; rare-earth stearates; stabilization mechanism; conductivity method; congo red test;
Abstract: A series of stearates with different rare-earth ion were investigated as thermal stabilizers for rigid PVC at 180 ℃ in air. Their stabilizing efficiency was based on measuring the rate of dehydrochlorination. The resulted revealed the higher stabilizing efficiency of the investigated rare-earth stearates as thermal stabilizers for rigid PVC compared with the thermal stabilizers for industry: calcium stearate, zinc stearate, butyl stannum mercaptide, phosphite esters, β-diketone and epoxidized sunflower oil. This was well illustrated by longer incubation period (TS) values and lower rate of dehydrochlorination. The stable efficiency was affected by the nature of rare-earth element's individual electronic shell. The mechanism for the stabilizing effect of rare-earth stearates was proposed. The result was experimentally proved based on IR spectrum.
Cai Weilong1，Fu Minglian1，Zhang Xing1，Wang Canyao1，Zheng Yuying1
(1.College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350002, China)
Abstract:A series of stearates with different rare-earth ion were investigated as thermal stabilizers for rigid PVC at 180 ℃ in air. Their stabilizing efficiency was based on measuring the rate of dehydrochlorination. The resulted revealed the higher stabilizing efficiency of the investigated rare-earth stearates as thermal stabilizers for rigid PVC compared with the thermal stabilizers for industry: calcium stearate, zinc stearate, butyl stannum mercaptide, phosphite esters, β-diketone and epoxidized sunflower oil. This was well illustrated by longer incubation period (TS) values and lower rate of dehydrochlorination. The stable efficiency was affected by the nature of rare-earth element''s individual electronic shell. The mechanism for the stabilizing effect of rare-earth stearates was proposed. The result was experimentally proved based on IR spectrum.
Key words:poly(vinyl chloride); thermal dehydrochlorination; rare-earth stearates; stabilization mechanism; conductivity method; congo red test;
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