Polypropylene catalyst and preparation method thereof

• Main Authors: LIU QIANG, ZHANG WENXUE, DENG SHOUJUN, SHAO YUEJUN, XU RENWEI, XIE XIN, LI YANQIN, MU RUIJUAN, ZHANG PINGSHENG, LIU XIAOYAN, GAO LIN, WANG XIA, SONG SAINAN, XIE KEFENG, XU YUNBEI, HUANG ANPING
• Format: Patent
• Language: Chinese; English
• Published: 05.10.2016
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to a polypropylene catalyst, comprising an alcoholic compound carrier of magnesium halide, titanium halide and an internal electron donor compound. The internal electron donor compound is a biphenyl-structure-containing diphosphine compound as shown in a general formula (I) which is described in the specification. In the formula, substituents R1 to R6 are same or different and are selected from a group consisting of C1-20 straight-chain alkyl groups, C3-20 branched-chain alkyl groups, C6-20 aryl groups and C7-20 alkoxyaryl groups. In the compound as shown in the general formula (I), phosphorus atom lone pair electrons can stabilize central metal titanium; meanwhile, the spatial effect of a biphenyl structure and groups with electronic effect introduced into the biphenyl structure can better stabilize active central metal titanium; thus, the catalyst has better activity in propylene polymerization compared with catalysts containing single or double phosphate, and enables polypropylene wit