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A novel type of thermal stabilizers-antimony tris(mercaptoethyl carboxylates) (Sb(SCH 2CH 2OOCR) 3), was synthesized from carboxylic acid, antimony trioxide and 2-mercaptoethanol in two steps. The experimental results show that the molar ratio of carboxylic acid to antimony tris(2-hydroxyethyl mercaptide) is 1.2, when adding 0.6% tetra-n-butyl titanate as catalyst and xylene as isotropic solvent, heating and refluxing for about 2～4 h. The thermal stability was measured by heat-aging oven test. The thermal stability time is about 8～40 min(at 200 ℃) when adding 2% tetra-n-butyl titanate in polyvinyl chloride(PVC). Among these stabilizers, antimony tris(mercaptoethyl stearate) has best thermal stability. Its thermal stability is better than that of Ca-Zn complex and basic lead stabilizers, and equal to that of organotin. In addition, the stabilization mechanism of this kind of stabilizers for PVC was discussed briefly.
A novel type of thermal stabilizers-antimony tris mercaptoethyl carboxylates (Sb (SCH 2 CH 2 OOCR) 3), was synthesized from carboxylic acid, antimony trioxide and 2-mercaptoethanol in two steps. The experimental results show that the molar ratio of carboxylic acid to antimony tris (2-hydroxyethyl mercaptide) is 1.2, when adding 0.6% tetra-n-butyl titanate as catalyst and xylene as isotropic solvent, heating and refluxing for about 2-4 h. The thermal stability was measured by heat-aging oven When these stabilizers, antimony tris (mercaptoethyl stearate) has the best thermal stability. Its thermal stability is about 8 ~ 40 min (at 200 ℃) when adding 2% tetra-n-butyl titanate in polyvinyl chloride thermal stability is better than that of Ca-Zn complex and basic lead stabilizers, and equal to that of organotin. In addition, the stabilization mechanism of this kind of stabilizers for PVC was discussed briefly.