Rubber And Plastic Additives – Polytetrafluoroethylene Anti-drip Agents

In engineering plastics, polytetrafluoroethylene (PTFE) is generally used as an additive. Polytetrafluoroethylene is mainly used in two aspects in the field of engineering plastics: anti-drip agents and wear-resistant lubricants.

micronized ptfe

The difference between anti-drip agents and wear-resistant lubricants:

1. The chemical composition of anti-drip agents and wear-resistant lubricants is polytetrafluoroethylene. The difference is that the molecular weight of anti-drip agents is about 4 million to 5 million, and the molecular weight of wear-resistant lubricants is about 300,000.

2. Large molecular weight polytetrafluoroethylene is fibrotic under the shear force of the screw to form a network structure, which plays an anti-drip role.
3. Adding small molecular weight polytetrafluoroethylene to plastics, rubbers, coatings and other materials can significantly reduce the friction coefficient of the material surface and improve the wear resistance of the material itself. At the same time, it can play the role of internal lubrication and demolding.

Anti-drip agents are mainly used in plastic materials that require flame retardants to reach V0 level. They can prevent melting and dripping and improve flame retardant properties. When reducing the amount of flame retardants, they can also meet the requirements of UL V-0, while reducing costs and enhancing product competitiveness.

Among them, PC and PC/ABS are the most used; in addition, they are also widely used in materials such as PBT, ABS, and HIPS; PA and PP are crystalline polymers, which are not compatible with polytetrafluoroethylene. Anti-drip agents are not easy to use in these two materials. If they are not well controlled, they are prone to swelling. It is recommended to use pure powder anti-drip agents in PA and PP.