Novel composite heat stabilizer and application thereof in polyvinyl chloride material

The invention relates to a novel composite heat stabilizer which is characterized by containing phthalic acid metal salt, fatty acid rare earth, beta-diketone, calcium acetylacetonate, a composite antioxidant, PE wax and hexadecanol. The novel composite heat stabilizer provided by the invention can be used for comprehensively and effectively enhancing the heat stability of polyvinyl chloride, for instance, a polyvinyl chloride material with the composite heat stabilizer added has longer Congo red discoloring time and more excellent initial colorability and dynamic heat stability, has good processing property and is capable of promoting the plasticization, reducing the torque of a fusant, free of toxicity, environmental-friendly, capable of substituting an organic tin heat stabilizer, a lead heat stabilizer or other heat stabilizers with higher toxicity.