Preparation method of solid catalyst for propylene polymerization and catalyst prepared thereby
Disclosed are a method for preparing a solid catalyst for propylene polymerization and a catalyst prepared thereby. Specifically, disclosed are a method for preparing a solid catalyst for propylene polymerization which can prepare polypropylene having excellent stereoregularity with a high production yield by using silane compounds and bicycloalkanedicarboxylate or bicycloalkenedicarboxylate as an internal electron donor, and a catalyst prepared thereby method for preparing polypropylene using the same.
1. A method for preparing a solid catalyst for propylene polymerization comprising the following steps:
(1) reacting dialkoxy magnesium with silane compounds in the presence of an organic solvent selected from the group consisting of C6-C12 aliphatic hydrocarbons, C6-C12 aromatic hydrocarbons and C6-C12 halogenated hydrocarbons;
(2) reacting titanium halide with the resulted product obtained from the step (1)
(3) adding one or more internal electron donors to the product resulted from the above step (1) while increasing the temperature to the range of 60-150° C., and reacting them together, wherein the internal electron donors are selected from the bicycloalkane dicarboxylates or bicycloalkene dicarboxylates represented by the following formula (III), formula (IV), formula (V) or formula (VI):
wherein R 1 and R 2 , which may be same or different, are a linear, branched or cyclic C1-20 alkyl, alkenyl, aryl, arylalkyl or alkylaryl group, respectively; R 3 , R 4 , R 5 and R 6 , which may be same or different, are hydrogen, a linear, branched or cyclic C1-20 alkyl, alkenyl, aryl, arylalkyl or alkylaryl group, respectively; and
(4) reacting the product obtained from the above step (3) with titanium halide at the temperature of 60-150° C. and washing the resulted product.
2. The method for preparing a solid catalyst for propylene polymerization according to claim 1 , wherein the silane compounds is represented as the following formula (I):
Si(OR 1 ) a R 2 (4-a) (I)
wherein R 1 and R 2 , being independent to each other, are C1-10 alkyl, cyclic alkyl or aryl; when R 2 is 2 or more, R 2 may be same or different, a is an integer of 0-4 for the atomic valence.
3. The method for preparing a solid catalyst for propylene polymerization according to claim 1 , wherein the silane compounds is tetraalkoxysilane.
4. The method for preparing a solid catalyst for propylene polymerization according to claim 1 , wherein the silane compounds is used at the amount of 0.1-1.0 moles based on the 1 mole of the dialkoxymagnesium.
5. The method for preparing a solid catalyst for propylene polymerization according to claim 1 , wherein the internal electron donor is used at the amount of 0.1-1.0 moles based on the 1 mole of the dialkoxymagnesium.