PVC lubricants narrative

PVC processing is an essential lubricant additives . Add appropriate amount of lubricant in PVC can reduce PVC and PVC particles before melting melt friction between macromolecules ; reduce PVC melt and the plastic flame retardant  friction between the contact surfaces of plastic machinery . Amount of lubricant can improve the PVC melt flow , improve production efficiency and to prevent friction and heat caused by PVC degradation and improve product appearance. Press the function can be divided into external and internal lubricant lubricants. PVC to poor external lubricant , the resin inside the melt easily migrate to the surface, forming a lubricant interface layer , thereby reducing the P PVC particles melt prior to melting the plastic mechanical friction between the contact surfaces . Lubricants containing a polar group , and has good compatibility with PVC , PVC can reduce intermolecular forces , reduce melt viscosity and improve the melt fluidity .
Lubricant inside and outside of the titanium dioxide  points only relatively speaking , there is no strict criteria for the classification . In a different polarity resins , internal and external lubricant may change .
Such as stearic alcohol, stearic acid amine, butyl stearate , and stearic acid monoglyceride the polar resin ( such as PVC and PA) made ​​, from the internal lubrication, but for non -polar resin ( such as PE
, PP) , the external lubrication effect is displayed . In contrast , polymer with polar resins such as paraffin poor , such as in polar
PVC is used as external lubricant , and the PE
, PP and other non-polar resin was internally lubricated
Agent. At different  processing  titanium dioxide temperatures , inside and outside will change the role of a lubricant such as stearic acid and stearyl alcohol are used in PVC calendering initially, as the processing temperature is low, and PVC
Compatibility is poor, mainly from outside the lubricating effect, when the temperature rises, increases compatibility with PVC , then transformed into an internal lubricant effect.