What Lubricant Can Be Used on PVC?

Lubricants are additives used to improve the processing performance and appearance of polymers such as plastics and rubber. In addition to reducing friction, improving flowability and mold release, lubricants can also improve the surface finish of products, prevent sticking between products, and enhance interfacial properties.

Different Mechanisms of Internal and External Lubricants in Plastic Processing

Lubricants can be divided into internal lubricants and external lubricants, mainly depending on their compatibility with resins. Internal lubricants have high affinity with resins, reducing the interaction forces between large molecules, and mainly play the following roles:

External lubricants have low affinity with the resin, reducing friction between the resin and processing machinery. They mainly play the following roles:

Common Plastic Lubricants

Saturated hydrocarbons - Saturated hydrocarbons can be divided into non-polar hydrocarbons (such as polyethylene wax and polypropylene wax) and polar hydrocarbons (such as chlorinated paraffin waxes and oxidized polyethylene, etc.). They are mainly used for non-toxic external lubricants in PVC.

Liquid paraffin - Commonly known as white oil, it is a colorless transparent liquid that can be used as a transparent internal lubricant for PVC.

Solid paraffin - Also known as natural paraffin, it is a white solid that can be used as an external lubricant for PVC; excessive use can affect transparency.

Fischer-Tropsch synthetic wax - Can replace paraffin as an external lubricant for PVC, with excellent performance and competitive prices.

Microcrystalline wax - White or light yellow solid in appearance, known for its superior lubrication and thermal stability compared to other waxes.

Low molecular weight polyethylene - Also known as polyethylene wax, it is a colorless or light yellow solid, with poor transparency. It can be used for PVC extrusion and calendering.

Oxidized polyethylene wax - Partially oxidized product of polyethylene wax, white powder in appearance; excellent internal and external lubrication effects, good transparency.

Chlorinated paraffin waxes - Good compatibility with PVC, poor transparency, good results when used in combination with other lubricants.

Metal soaps - Excellent heat stabilizers and lubricants, with both internal and external lubrication effects, slightly different emphasis on different varieties.

Stearic acid butyl ester - Colorless or light yellow oily liquid in appearance, mainly used for internal lubrication with some external lubrication effect in PVC.

Mono-stearate of glycerol - White waxy solid, excellent internal lubricant for PVC with minimal impact on transparency.

Stearic alcohol - White bead-like substance, acts as an internal lubricant with good transparency.

Pentaerythritol - High-temperature lubricant for PVC.

Recommended Selection Methods for Lubricants

Soft products

Hard products

Selection based on different processing methods

In a formulation, both internal and external lubricants should be used together. The amount of lubricant varies depending on the processing method.

When choosing lubricants, multiple factors need to be considered. In the production of plastic products such as molded injection parts, PVC window frames, and PVC pipes, products such as KHWAX QP115H, KH FT WAX 105, KHWAX QP85HN, and KHWAX QP80HN from Fischer-Tropsch synthetic wax are favored by customers at home and abroad. Please contact KING HONOR for details. 

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