Heat stabilizer
Heat stabilizers are mainly used for polyvinyl chloride and its copolymers, polyvinyl chloride in the hot processing process, before reaching the melt flow, there is a small amount of molecular chain breaks and release hydrogen chloride, and hydrogen chloride is a catalyst that accelerates the chain reaction of molecular chain breaks, so if the newly decomposed hydrogen chloride is not ruled out in time, the polymer chain will not break into a low molecular compound, so that plastics such as polyvinyl chloride cannot be processed and molded. Adding appropriate alkaline substances to PVC can immediately neutralize the decomposed hydrogen chloride and achieve the purpose of stabilizing PVC.
Commonly used heat stabilizers are divided into primary stabilizers and auxiliary stabilizers:
Main stabilizer: mainly salts and soaps containing lead, calcium, cadmium, zinc, barium, aluminum, lithium, strontium and other heavy metal cations
Among them, lead sulfate and lead stearate are the most widely used.
Auxiliary stability: mainly refers to epoxygenated oils and esters, but they also have a certain plasticizer function.
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