The combination effect of stabilizers and lubricants

Almost the vast majority of rigid polyvinyl chloride is used as a structural material, so the stabilization effect should sacrifice its characteristics as a structural material, including thermal distortion temperature, modulus, wear resistance, etc.

Therefore, all stabilizers used for rigid polyvinyl chloride must not act as plasticizers. The selected stabilizer (such as lead salt/calcium zinc stabilizer) must be able to penetrate into the matrix of the polymer without increasing its mobility. Lubricants are allowed as stabilizer assistants. By definition, lubricants can only temporarily affect the structure of polymers and cannot significantly alter their properties. Therefore, the efficiency of stabilizers depends on their ability to coordinate with internal lubricants.

In many cases, degradation occurs simultaneously during the production of rigid polyvinyl chloride products. Shear and friction heat generation are very intense in these processes, so external lubricants are also important to reduce the shear rate near the processing surface, so that the composite of stabilizer and internal lubricant can minimize shear forces and remedy internal defects of the compound. Therefore, the balance of internal and external lubricants and the function of stabilizers play equally important roles.