Ca-Zn stabilizer lead salt substitute that must be resolved
Liquid calcium zinc stabilizer is calcium zinc organic salts, phosphites, polyols, antioxidants and solvents composite components. Liquid calcium zinc stabilizer with the resin and plasticizer compatibility, transparency, and not precipitation, less dosage, easy to use. The main drawback is poor lubrication, lower the softening point of products, long-term storage will deteriorate and so on.
The solid compound calcium - zinc soap stabilizer stearic acid soap, followed by oleic acid is lauric acid soaps and soap. Products are characterized by good lubricity without lowering the softening point of PVC hard products for rigid PVC pipe and profile processing.
The use of micro-emulsion technology and processing of the products get the people to overcome the above drawbacks mainly from two aspects to improve: to improve the initial coloring, with a sufficient amount of zinc soap, using a chelating zinc chloride harmless, this As a high zinc complex: to reduce the amount of zinc soap to suppress zinc burn, additive initial coloration change, this approach becomes low zinc complexes. Not only widely used in soft products, the thermal stabilizing effect and transparency have been recognized, but also successfully applied to hardware products processing. In order to make the calcium / zinc system while maintaining the small initial coloring, and can suppress zinc burn.
Usually only lead salt PVC particles attached to the surface, which acts as PVC hinder fusion between the particles will be significantly delayed plasticized PVC reduces friction between particles, reducing the role of PVC within the shear processing equipment to withstand lower loads. Large amount of lead salt, lead salt finer particles, the more obvious secondary effect.