What are the ultra-high molecular weight polyethylene identification method

by:SanTong     2021-02-05
Ultra-high molecular weight polyethylene ultra - English name 高分子量聚乙烯( UHMWPE) No branched chain, is the molecular weight of more than 1. 5 million linear polyethylene. Molecular formula: - ( — CH2- CH2— ) — n— , density: 0. 920-0. 964g/cm3。 Thermal deformation temperature ( 0. 46MPa) 85 ℃, melting point 130 ~ 136 ℃. Ultra-high molecular weight polyethylene pipes in China in 2001 by the Ministry of Science and Technology the KeJi word ( 2000). No. 056 document listed as national key scientific and technological achievements promotion plan, chemical new material, new products. The state planning commission Ministry of Science and Technology will ultra-high molecular weight polyethylene pipe as the current priority to the development of high-tech industry in key areas. Ultra-high molecular weight polyethylene is a kind of high molecular compound, it is difficult to machining, and it has strong wear resistance, self-lubrication, high strength, stable chemical properties, ageing resistance is strong, so when discern between true and false polymer polyethylene, it is important to note that several characteristics of it, specific discrimination method is as follows: with gel spinning - Super stretching technique was used to prepare high strength and high modulus polyethylene fiber is in the late 70 s a new spinning method. Holland DSM company first patented in 1979, then Allied companies in the United States, Japan and the Netherlands Toyobo - can be established DSM company, Japan's Mitsui company implement the industrial production. China's chemical fiber textile university from 1985 began the project study, gradually formed its own technology, products with high performance of ultra high molecular weight polyethylene ( 超高分子量。 PE) Fiber. Ultra-high molecular weight polyethylene ( 超高分子量。 PE) Is a kind of linear structure of thermoplastic engineering plastics with excellent comprehensive performance. Ultra-high molecular weight polyethylene pipes in China in 2001 by the Ministry of Science and Technology the KeJi word ( 2000). No. 056 document listed as national key scientific and technological achievements promotion plan, chemical new material, new products. The state planning commission Ministry of Science and Technology will ultra-high molecular weight polyethylene pipe as the current priority to the development of high-tech industry in key areas. Ultra-high molecular weight polyethylene is a kind of high molecular compound, it is difficult to machining, and it has strong wear resistance, self-lubrication, high strength, stable chemical properties, ageing resistance is strong, so when discern between true and false polymer polyethylene, it is important to note that several characteristics of it, specific discrimination method is as follows: 1. Weighing principle: the proportion of pure made of ultra-high molecular weight polyethylene products in 0. 93 - 0. 95, density is small, can float on the water. If it is not the pure polyethylene material, will sink to the bottom.     2. Temperature measurement: the pure ultra-high molecular weight polyethylene products, in 200 degrees Celsius is not melting, not deformation, but will soften. If it is not the pure ultra-high molecular weight polyethylene material in 200 degrees Celsius is there will be a deformation.     3. Visual methods: real ultra-high molecular weight polyethylene smooth, uniform, smooth surface and edge density is very uniform, if not the pure colour and lustre is dim and uneven density polyethylene materials.     4. Edge test method: the pure ultra-high molecular weight polyethylene flanging end face round, uniform, smooth, if not the pure polyethylene material flanging end face has a crack, slag and flanging occurs after heating off phenomenon.
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