Preparation and Application of Calcium/Zinc Laurel Monomaleate Used as Thermal Stabilizers for PVC
In order to obtain thermal stabilizer calcium/zinc Laurel monomaleate used in PVC system,maleic acid and Laurel alcohol were used to produce the intermediate Laurel monomaleate without catalyst,then,the Laurel monomaleate is reacted with sodiumhydroxide,following the reaction with calcium/zinc chloride. The intermediate and final synthesized product were verified by UV and FTIR. The thermal stabilities of PVC in the presence of the calcium/zinc Laurel monomaleate were evaluated systematically by means of thermal aging oven test,Congo red test and conductivity test. Furthermore,the thermal stabilizing effect and mechanical properties ofPVC added by calcium/zinc Laurel monomaleate were compared with those of PVC added by traditional calcium/zinc stearate. The results exhibit that the calcium/zinc Laurel monomaleate compound system enhances the thermal stability of PVC based on synergy effects. The degradation and coloring of PVC samples in the early thermal aging stages are effectively restrained,thermal stability time of the samples is dramatically increased and the time of beginning to release hydrogen chloride is prolonged,the best efficacy mass ratio of calcium Laurel monomaleate and zinc Laurel monomaleate is 3:1,which has better stabilizing effect for PVC and similar effects on tensile properties of PVC compared with the traditional calcium/zinc stearate under the same conditions. In conclusion,the prepared calcium/zinc Laurel monomaleate can replace traditional calcium/zinc stearate products for being used in PVC system.
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