Catalyst compounding system for improving rigidity and toughness balance of base resin special for PPR pipes

Abstract

The invention discloses a catalyst compounding system for improving rigidity and toughness balance of a base resin special for PPR pipes. The catalyst compounding system comprises a main catalyst, a cocatalyst, an external electron donor and an internal electron donor; the main catalyst is MgCl2 / SBA-15 composite carrier loaded titanium tetrachloride, the cocatalyst is triethylaluminum, the internal electron donor is a diether, and the external electron donor is dimethyloxysilane; an adopted carrier is an MgCl2 / SBA-15 composite carrier; ordered mesoporous silicon SBA-15 serving as a model carrier has very excellent performance; SBA-15 silicon molecular sieve has highly ordered large mesopores; the specific surface area is large, the stability is good, mussel bionic dopamine is used for regulation and control in the preparation process of the MgCl2 / SBA-15 composite carrier, the water solubility and the loading property of titanium tetrachloride loaded on the MgCl2 / SBA-15 composite carrier can be improved, and meanwhile the catalytic activity can be enhanced.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a catalyst compounding system for improving the rigidity-toughness balance of a special base resin for PPR pipes. Background technique [0002] Mesoporous molecular sieve materials have the advantages of ordered pores, adjustable pore size, large specific surface area and pore volume, and are good catalysts and carrier materials. In recent years, heterogeneous catalysts such as solid acids and heteropolyacids prepared using mesoporous molecular sieve materials as templates not only have high catalytic activity for propylene polymerization, but also have fewer side reactions and simpler post-treatment. [0003] Because the homogeneous polypropylene catalyst requires a large amount of catalyst to achieve high activity, the production cost is high, and the obtained polymer has no particle shape, it cannot be used in the widely used slurry method or gas phase polymerization process...

AI Technical Summary

Problems solved by technology

[0003] Because the homogeneous polypropylene catalyst requires a large amount of catalyst to achieve high activity, the production cost is high, and the obtained polymer has no particle shape, it cannot be used in the widely used slurry method or gas phase polymerization process, an effective way to overcome the above problems It is to load the soluble polypropylene catalyst

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