Polyethylene wax is commonly used as an external lubricant and processing aid in the compounding of Polyvinyl Chloride (PVC).
Typical applications
Lubrication
Polyethylene wax serves as an effective lubricant, reducing friction between PVC particles and processing equipment like extruders and moulds. This lubrication helps in the smooth flow of the PVC melt during processing and prevents it from sticking to metal surfaces, reducing wear and tear on machinery.
Flow Enhancement
By reducing the melt viscosity of PVC, polyethylene wax improves flowability during processing. This is particularly important in PVC extrusion, injection moulding, and calendaring, where it ensures that the material can fill moulds or flow through dies evenly and with minimal resistance.
Anti-blocking
Polyethylene wax can act as an anti-blocking agent, preventing PVC products from sticking together during storage and transportation. This is especially relevant for PVC films, sheets, or molded parts.
Thermal Stability
Polyethylene wax helps improve the thermal stability of PVC compounds, making it less prone to thermal degradation during processing at elevated temperatures.
Gloss and Surface Finish
In applications where surface appearance is crucial, polyethylene wax can enhance the gloss and overall finish of PVC products, providing a smooth and shiny surface.
Impact Modification
In some cases, polyethylene wax can contribute to improving the impact strength of PVC compounds, making them more resistant to cracking and breaking.