A kind of polypropylene preparation method for preparing high chlorination rate chlorinated polypropylene

Abstract

The present invention relates to a polypropylene preparation method for preparing chlorinated polypropylene with high chlorination rate; adding 3-20mmol alkyl aluminum hexane solution to 1000ml linear saturated alkane or linear saturated alkane mixture; adding 0.1- 0.5g catalyst / ml linear saturated alkanes or linear saturated alkanes mixture; 10-150μl orthosilicate compound / g catalyst, 10-150μl nitrogen-containing heterocyclic compound / g catalyst, feed propylene / hydrogen mixed gas; The catalyst is Ziegler-Natta catalyst; the linear saturated alkane is hexane or octane; the linear saturated alkane mixture is a mixture of nonane and decane; the nitrogen-containing heterocyclic compound is 2,2,6,6-tetramethyl Pyridine: The melt index of the polypropylene is 20-50g / 10min, the isotacticity is 91-95%, the crystallinity is 40-54%, and the bulk density is greater than 0.38g / cm3.

Description

Technical field:

[0001] The invention relates to a polypropylene preparation method for preparing high chlorination rate chlorinated polypropylene. Background technique:

[0002] As an important synthetic resin, polypropylene is widely used. The different properties of polypropylene determine its use. At present, due to the requirements of the polymerization process, the polypropylene prepared by the slurry method generally has a high isotacticity (above 97%), a high degree of crystallinity (above 60%), and the melting index of industrial powder products is difficult to determine. to very high (higher than 20g / 10min). Unable to meet the needs of some specific purposes. For example, it is used in the production of chlorinated polypropylene by the aqueous phase suspension chlorination method. The aqueous phase suspension chlorination method requires polypropylene to have both uniform powder, relatively low isotacticity and crystallinity, and a high melt index at the same ti...