Patent ID: 8435913

Claim:
A method for preparing a catalyst for propylene polymerization, wherein the method comprises: obtaining a dialkoxy magnesium carrier by reacting metal magnesium with 5-50 parts by weight of an alcohol, based on 1 part by weight of metal magnesium, at 60-110° C. in the presence of 0.001-0.2 parts by weight of a nitrogen-based halogen compound as a reaction initiator, based on 1 part by weight of metal magnesium, selected from the following (1)-(4): (1) N-halide succinimides represented by the general formula wherein, X is a halogen atom, and R 1 , R 2 , R 3 and R 4 are independently hydrogen, or C 1-12 alkyl or C 1-12 aryl; (2) trihaloisocyanuric acid compounds represented by the general formula wherein, X is a halogen atom; (3) N-halophthalimide compounds represented by the general formula wherein, X is a halogen atom, and R 1 , R 2 , R 3 and R 4 are independently, hydrogen, or C 1-12 alkyl or C 1-12 aryl; and (4) hydantoin compounds represented by the general formula wherein, X is a halogen atom, and R 1 and R 2 are independently hydrogen, or C 1-12 alkyl or C 1-12 aryl; reacting the above obtained dialkoxy magnesium carrier with titanium tetrachloride; and reacting the resultant product with titanium tetrachloride and an internal electron donor.