The amount of PE wax added to PVC, PE wax has a very long non-polar carbon chain with a very strong polar center. The part of its structure that is compatible with the plastic in polarity acts as internal lubrication, and the part that is incompatible with the plastic in polarity acts as external lubrication and demoulding.
The important application of PE wax is in PVC processing. It does not adversely affect melt tension and Vicat softening point and provides excellent anti-blocking and flow control compared to fatty acid based lubricants. PE wax can be used to control melting in special processing methods.
Even if the added amount is large, it has good compatibility with other ingredients. PE wax is the only known plastic lubricant that can have both internal lubrication and external lubrication (release effect), while maintaining a high degree of transparency and has almost no effect on gelation.
In addition, the low volatility characteristics of PE wax are extremely important for calendering and vacuum degassing. As an internal lubricant, PE wax has good compatibility with polymers. It plays a role in reducing the cohesion between polymer molecules inside the polymer, thereby improving the internal friction heat of the plastic melt and the fluidity of the melt. .
The role of PE wax as an external lubricant is mainly to improve the friction between the polymer melt and the hot metal surface of the processing equipment. It has poor compatibility with polymers and easily migrates out of the melt, so it can form a lubricating thin layer at the interface between the plastic melt and the metal.
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