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UHMWPE Sheet Extrusion Machine
Characteristics of UHMWPE
The extraordinarily excessive molecular weight of uhmwpe (the molecular weight of hdpe is usually simplest 20 ~ 300,000) endows it with exceptional overall performance, and it's miles a type of thermoplastic engineering plastics with mild rate and amazing performance, with normal polyethylene and other engineering plastics incomparable wear resistance, impact resistance, self-lubrication, corrosion resistance, absorption effect power, low temperature resistance, health non-poisonous, no longer easy adhesion, now not smooth to take in water, low density and other complete properties. in fact, no unmarried polymer material has so many wonderful houses.
Abrasion resistance:
The impact strength of UHMWPE is the highest among all engineering plastics. Compared with other engineering plastics, the impact strength of UHMWPE is about 2 times of that of impact resistant PC, 5 times of ABS and 10 times of POM and PBTP. The impact resistance is so high that it is difficult to break it by conventional impact test methods. The impact strength increases with the increase of molecular weight, reaches the maximum when the molecular weight is 1.5 million, and then decreases with the increase of molecular weight. It is worth pointing out that it also maintains excellent impact strength in liquid nitrogen (- 195 °C) , a characteristic not found in other plastics. In addition, it has a higher hardness on repeated impact surfaces.
Self-lubrication:
UHMWPE has very low friction coefficient (0.05 ~ 0.11) , so it has excellent self-lubrication. Table 1 shows the comparison of friction factor between UHMWPE and other engineering plastics. As can be seen from Table 1, the dynamic friction factor of UHMWPE is 1/2 of that of PA66 and POM under water lubrication, and is second only to that of the plastic under non-lubrication conditions, when it operates in a sliding or rotary manner, and the friction coefficient of UHMWPE is 1/2 of that of POM, it’s better than steel and brass with oil. Therefore, Uhmwpe is regarded as a very ideal friction material in the field of tribology.
