A novel type of thermal stabilizer antimony tris (thioethyl stearate)(ATS) was synthsized. Its thermal stability was measured by heat aging oven test when incorporated into PVC. ATS was synthesized from stearic acid, antimony trioxide and 2 mercaptoethanol in two steps. The reaction conditions of synthesis were optimized through orthogonal test. Experimental results show that the molar ratio of stearic acid and antimony tris (2 hydroxyethylthiolate) was 1.2, adding 0.6% tetra n butyl titanate as catalyst and xylene as azeotropic solvent, heating and refluxing for about 4 h, and the yield of ATS is 83.9%. The thermal stability time is about 40 min(at 200 ℃) when added 2phr(per hundred resin) in PVC. The thermal stability of ATS is better than that of Ca Zn complex and basic lead stabilizers, and equal to that of dibutyltin dilaurate.
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