Industrial Production and Performance Investigation of High Rubber Content Impact Polypropylene Copolymer
LUO Liqiong1,2, LIU Yang3, WU Yijian2,3, XIA Jianmeng2, LIU Weifeng1, YANG Bo3, MA Qingshan3, CAO Min3
1. College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
2. Ningbo Kingfa New Material Company Limited, Ningbo 315803, China;
3. Kingfa Science and Technology Company Limited, Guangzhou 510663, China
Abstract：In order to meet the increasingly stringent requirements of food contact regulations, this work used a large particle size of phthalate-free catalyst (Cat2) to prepare high rubber content impact polypropylene copolymer on a 400 kt/a ST-Ⅱ dual-loop polypropylene industrial plant, and compared the catalytic performance of Cat2 with the phthalate ester catalyst (Cat1) originally used in the plant. The industrial test results showed that comparing with Cat1, using Cat2 reduced the average hydrogenation dosage in the loop reactor section by about 12%, reduced the external electron donor consumption by about 84%, increased the isotropy of the homopolymer by 2 percentage points, and the xylene soluble content of the product remained basically unchanged. Further characterization and analysis were conducted on the microstructure, phase morphology, and macroscopic properties of the high impact polypropylene copolymer prepared by two catalysts. The rubber phase of the high impact polypropylene copolymer (IPC-Cat2) prepared by Cat2 had a higher weight average molecular weight, more uniform ethylene insertion, and larger domain size. The melting point, heat deformation temperature, tensile strength, bending strength, and bending modulus of IPC-Cat2 had all increased, but the impact strength and S-grain board gloss had slightly decreased. This work provided a basis for the industrial application of using Cat2 instead of Cat1 to prepare high rubber content impact polypropylene copolymer.
. Industrial Production and Performance Investigation of High Rubber Content Impact Polypropylene Copolymer[J]. Chemical Reaction Engineering and Technology, 2025, 41(6): 723-731.
