POLYPROPYLENE MATERIAL WITH HIGH MELT STRENGTH AND PREPARATION PROCESS AND USE THEREOF

摘要

Disclosed are a polypropylene material with a high melt strength, and a preparation process and the use thereof. The polypropylene material is prepared from 65-99.79 parts of polypropylene, 0.01-10 parts of an initiator, 0.1-10 parts of a multi-functional monomer, 0.1-5 parts of a free radical stabilizer and 0-10 parts of an inert processing aid. The free radical stabilizer is a lanthanide rare earth oxide, a carboxylate of a lanthanide rare earth element, a naphthenic acid complex of a lanthanide rare earth element or a dithiocarbamic acid rare earth compound. The lanthanide rare earth element does not include promethium. In the present invention, by controlling the proportion of polypropylene, initiator and multi-functional monomer, increasing the time for the grafting reaction, inhibiting the degradation of polypropylene using rare earth materials and prolonging the lifetime of the free radicals, polypropylene having a high melt strength, a long branched chain and stable performance is obtained and the usage of common polypropylene is improved. The process in the present invention is easy to operate, convenient to control and facilitates industrialized production.