| 摘要 |
FIELD: polymerization processes and catalysts. ^ SUBSTANCE: invention relates to preparing supported titanium-magnesium catalyst for production of polyethylene and superhigh-molecular weight polyethylene via suspension polymerization of ethylene in hydrocarbon solvent. Invention provides a method for preparing supported ethylene polymerization catalyst containing titanium compound on magnesium-containing support, which is prepared by interaction of dissolved organomagnesium compound having following composition: MgPh2.nMgCl2.mR2O, wherein R represents butyl or isoamyl, n=0.37-0.7, and m=1-2, with compounds inducing conversion of organomagnesium compound into solid magnesium-containing support. As such compounds, there is used a composition including product of reaction of alkylsilane R'kSi4-k, wherein R is alkyl or phenyl and k=1, 2, with silicon tetraalkoxide Si(OEt)4 at molar ratio 2-4, respectively, and a dialkylaromatic ether. Catalyst is characterized by high activity at temperatures <=60°C and particle size within a range 5.5 to 3.0 mum. Catalyst allows a polymer powder with average particle size <=150 mum, narrow particle size distribution, and high loose density (>=250 g/L) to be obtained. ^ EFFECT: enhanced low-temperature catalyst activity and selectivity. ^ 3 cl, 1 tbl, 15 ex |
