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Characteristics and mechanism of heat stabilization of PVC by 4A zeolite
Pages: 33-36,53
Year: Issue:  2
Journal: China Synthetic Resin and Plastics

Keyword:  polyvinyl chloride4A zeoliteheat stabilizercharacteristics of heat stabilizationmechanism of heat stabilization;
Abstract: The heat stabilization of polyvinyl chloride (PVC) by 4A zeolite was studied by oven discoloration method. The results indicate that 4A zeolite is a long-term type heat stabilizer with the heat stabilizing efficiency markedly higher than that of calcium stearate, and exhibits synergistic effect with zinc stearate (ZnSt2); the heat discoloration of PVC stabilized with 4A zeolite and 4A zeolite/ZnSt2 shows obvious step-type characteristics. The unique heat stabilizing characteristics of 4A zeolite can be explained reasonably by the mechanism as follows: it exchanges Na+ with H+ of HCl produced from thermal degradation of PVC or with Zn2+ of ZnCl 2 transformed from ZnSt2 by ion exchange at the earlier stage, and neutralizes HCl with its skeleton structure {[(AlO2)12·(SiO2)12]12-} at the later stage.
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