Olefin polymerization catalyst and preparation method and use thereof

US8716417B2 · kind B2 · utility

Assignee

• PetroChina Company Limited · CN

Inventors

• Jianjun Yi · Beijing, CN
• Chunming Cui · Tianjin, CN
• Huashu Li · Renqiu City, CN
• Zhifei Li · 翁根苏木, CN
• Baozuo Yin · Tianjin, CN
• Liang Cui · 安丰镇, CN
• Jianying Zhang · Beijing, CN
• Liang Wang · Changzhou City, CN

Key dates

• Filing date: Jun 3, 2011
• Grant date: May 6, 2014
• Expiry date: Jun 3, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F10/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An olefin polymerization catalyst and preparation method and use thereof are provided. The components of the catalyst comprise an active magnesium halide, a titanium compound containing at least one Ti-halide bond loaded on the active magnesium halide, and an internal electron donor selected from one or more silicon esters compounds having formula (I). The method for preparing the catalyst components is that: adding spherical magnesium chloride alcoholate particles and the electron donor into the solution of titanium compound in sequence, and processing with the titanium compound for one or more times to obtain the catalyst. The catalyst system used for the olefin polymerization comprises the catalyst components, a cocatalyst and an external electron donor. The catalyst has high activity for the propylene polymerization, and the activity is 4399 gPP/gTi·h(50° C., 1 h, slurry polymerization at atmospheric pressure), and the isotacticity of the polymer is 98%.