Strategic report on UHMWPE sheet sustainable development

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2014-01-09

Ultra-high molecular weight polyethylene (UHMW-PE) is a thermoplastic engineering plastics. It combines the most plastics have superior performance, impact resistance, low temperature resistance, abrasion resistance, chemical resistance, self-lubricating, absorb impact energy, this feature is currently six plastic has the highest value in recent years, this new plastic products are widely used in the United States and Europe, demand is growing. Similarly, in the application of ultra high molecular weight polyethylene products are increasingly being used, is China's "Ninth Five " plan " priority focus on high-tech industries have developed Field Guide " was to promote the project.

UHMWPE sheet using Ziegler-type catalyst efficiency low-pressure synthesis, molecular weight control 150-300 million or more as needed. Taking into account the thermal degradation during processing elements too, so it has a viscosity average molecular weight of more than 1.7 million have high-density polyethylene processed into various products, in order to be able to be more advantageous. 1, high wear resistance: at present all have plastic wear in UHMW-PE was the best and most compelling. The higher molecular weight materials more resistant, even more than many metal materials ( such as carbon steel, stainless steel, bronze, etc. ). UHMW-PE pipe for example, in strong corrosion and high wear conditions is 4-6 times the life of steel, but also improve the transmission efficiency of 20%. Fully demonstrated the "energy, environmental, economic, and efficient" too superiority. 2, the corrosion resistance: from corrosion in alkaline solution, can be applied in a 80 ℃ concentrated hydrochloric acid was 75% concentrated sulfuric acid, 20% nitric acid was stable, its water, the liquid detergent is also stable. 3, have a very low coefficient of friction: static friction coefficient of 0.07, good self-lubricating, is an ideal get bearings, bushings, sliders, lining materials. UHMW-PE as optional equipment was friction components, in addition to improved wear life, it can also receive energy-saving effect. 4, impact resistance: shock resistance ranks first in plastic, whether it is strong external shock, or internal pressure fluctuations, making it difficult to crack. Nylon 66 is the impact strength was 10 times, 20 times of PVC, PTFE 8 times; especially at low temperatures, but the impact strength of the highest value, which provides a flexible delivery system performance extremely reliable safeguarded. 5, anti-aging: stable performance, good aging resistance, ground, can be buried underground for 50 years without aging. Measured according to ASTM method (load 4.6 kg / cm2), heat distortion temperature of 85 ℃, temperature up to 90 ℃, under special circumstances, allows the use of higher temperatures too. UHMW-PE is a ductile material was excellent, it was also very excellent low temperature resistance, low temperature at -269 ℃, still has some too malleable, and no signs of embrittlement. But larger coefficient of linear expansion, thermal conductivity is poor, so when designing products, to give full attention. 6, the electrical properties: the volume resistance, the breakdown voltage of 50KV/mm, a dielectric constant of 2.3. Obtained in a wide temperature and frequency range suitable for use as structural materials in electrical engineering too. 7, non-toxic health: UHMW-PE, tasteless, non-toxic, odorless, non-corrosive itself, with physical inertia and physiological adaptation. The U.S. Food and Drug Administration (FDA) and the U.S. Department of Agriculture (USDA) to allow it to be used in contact with food and medicines have occasion. The drawback of UHMWPE sheet is: low surface hardness, high mechanical strength, low thermal deformation temperature, poor high temperature performance and processing difficulties. To fill these deficiencies may have modified accordingly.

 

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