Study on Preparation and Application of Liquid Composite Thermal Stabilizers for PVC
Isocaprylic acid,sodium hydroxide,magnesium hydroxide,calcium hydroxide and zinc oxide were used as raw materials to synthesize sodiumlmagnesiumlcalciumlzinc isooctanoate by the one-step synthesis while white oil as solvent and diethylene glycol butyl ether as the reaction promoter.The compounded isooctanoic acid salts were used in polyvinyl chloride (PVC) composite system as the thermal stabilizer,and Congo red method,HAAKE torque rheometer and conductivity method were used to study the influence of different ratio of the composite thermal stabilizers on the thermal stability of PVC.The results showed that the thermostabilization effect of the ternary compound system was better than that of binary compound system.It had the best thermal stability when the ratio of sodiumlcalciumlzinc isooctanoate was 1/3/2 and the ratio of magnesium/calcium/zinc isooctanoate was 3/1/2 in the ternary compound system.
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