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AssigneesChina Petroleum & Chemical Corporation, Sinopec Yangzi Petrochemical Company Ltd.
InventorsChuanfeng LI, Wenrui WANG, Kun JING, Yuejun XING, Huimin XIA, Minghua CHEN, Zhonglin YOU, Shaohui CHEN, Jianhong ZHAI, Feng GUO, Liu YANG
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The present invention relates to an ultra-high molecular weight polyethylene and a process for preparing the same, said ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×104 g/mol, a metal element content of 0-50 ppm, a bulk density of 0.30-0.55 g/cm3, a true density of 0.900-0.940 g/cm3, a melting point of 140-152° C., and a crystallinity of 40-75%, and said polyethylene satisfies at least one of condition (1) and condition (2): Condition (1): tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa, more preferably greater than 300 MPa, Condition (2): Young's modulus is greater than 300 MPa, preferably greater than 350 MPa. The ultra-high molecular weight polyethylene has high mechanical properties, high melting point, low metal element content and ash content, and the preparation process is simple, flexible and adjustable, and the ultra-high molecular weight ethylene copolymer has a high tensile elasticity module.
A process for preparing an ultra-high molecular weight polyethylene, wherein said ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×104 g/mol, preferably 200-850×104 g/mol, more preferably 300-700×104 g/mol, which is characterized in that raw materials containing ethylene and optionally at least one como-nomer are subjected to the slurry polymerization in the absence of hydrogen gas, with a supported non-metallocene catalyst as the main catalyst, with one or more of aluminoxane, alkyl aluminum, and haloalkyl aluminum as the cocatalyst, with an alkane solvent having a boiling point of 5-55° C. or a mixed alkane solvent having a saturated vapor pressure at 20° C. of 20-150 KPa as the polymerization solvent.
An ultra-high molecular weight polyethylene, which is characterized in that the ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000×104 g/mol, preferably 200-850×104 g/mol, more preferably 300-700×104 g/mol, and a metal element content of 0-50 ppm, preferably 0-30 ppm, and said polyethylene satisfies at least one of Condition (1) and Condition (2):
Dependencies are inferred from the claim text.