What is the use of PE wax in PVC?

Polyethylene wax is a white powder with a softening point of about 100-117 ℃. Due to its large relative molecular weight, high melting point and low volatility, it also shows obvious lubrication effect at high temperature and shear rate. It is suitable for hard PVC single and twin-screw extrusion, with a common amount of 0.1-0.5phr.


During the production of PVC pipe profiles, there will be the phenomenon of unsmooth and poor brightness. Paraffin, as a PVC lubricant, has low softening point and poor dispersion. Due to the high temperature in the production process, the paraffin is basically liquefied and evaporated into gaseous state. It is difficult for paraffin to play a role in the application of PVC pipes. The dispersion effect is not good, and the PVC pipe profiles will be stained from the surface.
PVC pipe profiles produced by polyethylene wax (PE wax) will not have such problems, because the softening point of polyethylene wax wood body is high, and under high temperature conditions, polyethylene wax (PE wax) will only become liquid, with high viscosity and poor dispersion of polyethylene wax (PE wax), but the brightness is very good. If the viscosity of polyethylene wax (PE wax) is low, the dispersion is very good and the brightness is OK.
Qingdao Sainuo polyethylene wax has concentrated carbon distribution, concentrated molecular weight distribution, low thermal weight loss and good early, middle and late lubrication performance. Low viscosity, high softening point, large molecular weight, good thermal stability, excellent external lubricity and strong internal lubrication. Easy to disperse, which can greatly improve the gloss of products; Good compatibility, compatible with many products and anti precipitation; Good demoulding performance, long continuous production time and other advantages, with excellent characteristics. We will choose the appropriate polyethylene wax according to the different needs of customers.


Polyethylene wax has a very strong polar center and a long non-polar carbon chain. In the structure of polyethylene wax, the part compatible with plastic in polarity plays the role of internal lubrication, and the part incompatible with plastic in polarity plays the role of external lubrication and demoulding.
The important application of polyethylene wax lies in the processing of PVC. Compared with fatty acid lubricants, polyethylene wax has no adverse effect on melt tension and Vicat softening point, and provides it with excellent anti adhesion and flow control. In special processing methods, PE wax can be used to control melting. Even if the amount is large, it can have good compatibility with other components.
Polyethylene wax is the only known plastic lubricant that can both internal and external lubrication (demoulding effect), maintain high transparency and have little effect on gelation. In addition, the low volatility of PE wax is very important for calendering and vacuum degassing,.
As an internal lubricant, polyethylene wax has good compatibility with polymers. It plays a role in reducing the cohesion between polymer molecules in the polymer, so as to improve the internal friction heat generation and melt fluidity of plastic melt.
The function of PE wax as external lubricant is mainly to improve the friction between polymer melt and hot metal surface of processing equipment. It has poor compatibility with polymer and is easy to migrate from the melt to the outside, so it can form a lubricating thin layer at the interface between plastic melt and metal.
Qingdao Sainuo Chemical Co.,Ltd. We are manufacturer for PE wax, PP wax, OPE wax, EVA wax, PEMA, EBS,Zinc/Calcium Stearate…. Our products have passed the REACH, ROHS, PAHS, FDA testing.
Sainuo rest assured wax, welcome your inquiry!
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