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These 7 materials can improve the wear resistance of plastic

Author:QINSUN Released in:2022-12 Click:132


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Some plastics already have good wear resistance. After adding various wear-resistant additives, the wear resistance can be further improved. These additives such as polytetrafluoroethylene, molybdenum disulfide, graphite, silicone oil, glass fiber, carbon fiber and aramid fiber additives make plastic composites self-lubricating and reduce the friction of interlocking parts. pressure, improving the wear resistance of the material.

Let's look at the materials that can improve the wear resistance of materials.

1. Polytetrafluoroethylene (PTFE, Teflon)

PTFE has the lowest coefficient of friction between all additives. The PTFE molecules that are ground away during the friction process form a lubricating film on the surface of the part. PTFE hProvides good lubrication and wear resistance under friction and shear. In high load applications, PTFE is the best additive for wear resistance. These high load applications include hydraulic piston ring seals and thrust washers. The most suitable PTFE content is 15% PTFE for amorphous plastics and 20% PTFE for crystalline plastics.

2. Molybdenum Disulfide

Another common name for molybdenum disulfide is "Moly", a wear-resistant additive mainly used in nylon plastics. Molybdenum disulphide acts as a crystallizing agent to increase the crystallinity of nylon, making the nylon material produce a harder and more wear-resistant surface. Molybdenum disulfide has a high affinity for metals. Once adsorbed on the metal surface, the molybdenum disulfide molecules will fill the microscopic pores of the metal surface and make the metal surface smoother.This makes molybdenum disulfide an ideal anti-wear additive for applications where nylon rubs against metal.

3. Graphite

The chemical structure of graphite is a unique lattice structure. This unique chemical structure allows graphite molecules to slide easily over each other with little friction. This property of abrasion resistance is especially important in environments where water is present. This property makes graphite an ideal anti-wear additive for many applications that are placed in water, such as water-laid housings, impellers and value seals.

4. Polysiloxane

Polysiloxane fluid is a migratory anti-wear additive. When added to thermoplastics, the additive will slowly migrate to the surface of the part and form a continuous film. Polysiloxanes are available in a wide range of viscosities, measured in centistokeses. The viscosity of polysiloxane is very low and becomes fluid and quickly migrates to the surface of the part to provide wear resistance. If the viscosity of polysiloxane is too low, it will be more volatile and will migrate and quickly disappear from the parts.

5. Fiberglass

Fiberglass is hard and very scratchy. It is therefore often wrongly assumed that the addition of glass fibers to plastics negates the wear resistance of the plastics. Glass fibers provide a strong mechanical bond between polymers, so glass fibers can increase the integrity of thermoplastic structures and improve wear resistance. The reinforcement by glass fibers can increase the creep resistance, thermal conductivity and thermal deformation of plastics, greatly improving the ability of plastics to withstand load and wear rate.

6. Carbon fiber

Like fiberglass, carbon fiber can improve structural integrity, abrasion resistance, and the ability to withstand load and wear rate. Unlike fiberglass, carbon fiber is a softer and less scratchy fiber. Carbon fiber will not scratch the iron or steel abrasive faces it rubs against. Adding more than 10% carbon fiber to thermoplastics will have the function of eliminating static electricity and thus overcome the problem of static electricity caused by it.

7. Aramid fiber

Aramid fiber is also wear-resistant One of the additives . Unlike fiberglass and carbon fiber, it is the softest and most scratch-resistant fiber. This property is the main advantage of aramid fibers in wear-resistant applications, especially in mating areas where the surface of the fiber is resistant to scratching.