Propylene/1-butene copolymerization method patented

On May 3, a preparation method of propylene/1-butene random copolymer resin developed by the China Petroleum and Petrochemical Research Institute won the national invention patent authorization. The invention breaks through the prior art propylene/1-butene random copolymer preparation technology, the gas phase polymerization method is only applicable to the limitations of the gas phase process polypropylene device, and at the same time makes up for the tedious post-treatment process of adopting an inert solvent polymerization product. It is suitable for the production of copolymer products by bulk polymerization polypropylene devices.

Homo-polypropylene has relatively poor low-temperature impact strength, heat-sealing temperature and transparency, which limits its application in packaging materials. The random copolymerization of propylene and α-olefin can effectively increase the transparency of polypropylene and reduce the initial sealing temperature of the resin. Copolymer products also have the advantages of high transparency and flexibility, comparable to other transparent resins.

Researchers at the Petrochemical Institute used MgCl2-supported Ziegler-Natta catalysts to optimize the process conditions of bulk polymerization and the screening and compounding of external electron donors, so that the catalyst activity of propylene and 1-butene copolymerization was homopolymerized with propylene. quite. The resulting copolymer product has good particle morphology and suitable particle size distribution, lower melting point, high transparency, low xylene solubles, higher impact strength and modulus, and can be used for the production of BOPP film or CPP film.