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Introduction of impact resistance of ultra high molecular weight polyethylene board

Aug 13, 2019

Ultra-high molecular weight polyethylene sheet is a kind of engineering plastic with excellent performance, such as high wear resistance, impact resistance, low friction coefficient, good self-lubricating performance, excellent low temperature resistance and chemical resistance. Improve wear resistance. One of the most striking features of the improved molecular weight polyethylene is its extremely high wear resistance, which is invaluable in many engineering applications.


 

 

In all current plastics, the wear resistance is the best, even many metal materials (such as carbon steel, stainless steel, bronze, etc.) are not as regular as the grinding. As the molecular weight of polyethylene increases, the material becomes more wear resistant. Extremely high impact resistance. The impact strength of ultrahigh molecular weight polyethylene is related to its molecular weight, and when the molecular weight is less than 2 million, it increases with molecular weight.

 

The impact strength increases and reaches a peak at around 2 million. At this time, the molecular weight increases and the impact strength decreases. This is because the molecular chain is very obstructive to its photonic action, so that there is a large amorphous region in the macromolecule and thus can absorb a large impact energy. Very low friction coefficient. Ultra high molecular weight polyethylene is very wear resistant.

 

Moreover, it has low friction coefficient and good self-lubricating property, and is an ideal bearing bushing, slider and lining material. The use of ultra-high molecular weight polyethylene as the friction component of the equipment, in addition to improving the wear life, can also receive energy-saving effects. Good chemical resistance. Ultra-high molecular weight polyethylene has good chemical corrosion resistance, and it is not corroded in all alkali or acid except for concentrated nitric acid and concentrated sulfuric acid.

 

It can also be used in concentrated hydrochloric acid at 80oC. It is also stable in <20% nitric acid and <75% sulfuric acid. It is also very stable to water and liquid washing. However, ultra high molecular weight polyethylene is in aromatic flavor or Halogenated compounds (especially at higher temperatures) are highly swellable, so special care should be taken when applying them.