Preparation method of propene polymer composition
The invention relates to a preparation method of a propene polymer composition. The method is characterized in that in the presence of catalyst components and hydrogen, firstly the propene homopolymer is produced in three or more than three reactors, then the propene polymer is produced in a final reactor, the multiple reactors comprise liquid reactors and gas reactors, the reaction temperature of the liquid reactor is 60-85 DEG C, the pressure of the liquid reactor is 2-5 MPa, the reaction temperature of the gas reactor is 70-90 DEG C, the pressure of the gas reactor is 1-3 MPa, the number-average molecular weight of the polymer is not less than the average molecular weight of the homopolymer, the ratio of the melt index of the final polymer and the melt index of the homopolymer is 0.3 to 1.0, and the catalyst component adopts the catalyst disclosed in the patent CN1453298A. The propene polymer composition is fewer in xylene soluble matters, the melt temperature is low, the molecular weight is widely distributed, the modulus of the polymer is high, the processing is favored, and a BOPP (biaxially-oriented polypropylene) film of 12 micrometers can be stretched at a high speed (420m/min or more). 1. A process for producing propylene polymer composition, which is characterized in that: it is in the catalyst component and the presence of hydrogen, in the three or more than three in the multi-reactor, the production of propylene homopolymer first, in the last reactor in the production of copolymers of propylene, wherein the multi-reactor comprises liquid phase reactor and gas-phase reactor, wherein the reaction temperature of the liquid phase in the reactor for the 60-85 the [...][...] , the pressure is 2 MPa -5 MPa, the reaction temperature of the gas-phase reactor is in the 70-90 the [...][...] , pressure is 1 MPa to 3 MPa, and the number average molecular weight of the copolymer is not less than the average molecular weight of the homopolymers of the, final polymer with the homopolymers of the melt index of the melt index ratio is 0.3-1.0, the catalyst component uses proprietary CN1453298A the disclosed catalyst. 2. Process for producing propylene polymer composition according to Claim 1, which is characterized in that: the multi-reactor is two liquid phase cauldron and two gas phase cauldron Hypol process device of the three well.