Plastic Additives: Polymer Stabilizers, Plasticizers and Lubricants
During the manufacturing of polymeric materials, such as plastics and rubbers, a number of chemical additives are added to inhibit or retard their degradation or to achieve better product quality. Heat stabilizers, antioxidant , UV absorber, plasticizers and lubricants are the most commonly seen and widely used additives. Heat stabilizers Heat stabilizers are mainly used for polyvinyl chloride and its copolymers. During the thermal processing of polyvinyl chloride (PVC), a small amount of molecular chain breaks before reaching the melt flow and releases hydrogen chloride, and hydrogen chloride is a kind of catalyst that will accelerate the molecular chain breaking reaction. Therefore, if the newly decomposed hydrogen chloride is not eliminated in time, the polymer chain will be continuously cracked into low molecular compounds, so that plastics such as polyvinyl chloride cannot be well-processed and well-formed. Adding appropriate alkaline substances to PVC can immediately neutrali...