Magnesium alkoxide particle and application thereof

Abstract

The magnesium alkoxide particle contains the reaction product of the following components: 1) a magnesium powder; 2) a mixed alcohol; 3) a halogenating agent; and 4) a titanate compound. The magnesium alkoxide particle is used for preparing a catalyst for olefin polymerization.

Claims

1. An alkoxymagnesium particle, comprising a reaction product of a reaction mixture comprising reactants of 1) magnesium powder; 2) a mixed alcohol; 3) a halogenating agent; 4) a titanate compound; and optionally 5) a dispersing agent, wherein the alkoxymagnesium particle comprises titanium in an interior and on a surface thereof, the bulk density units should be changed from g/m.sup.3 to g/cm.sup.3 wherein a mass percentage of the titanate compound is 0.1-8.0 wt % of a total weight of the alkoxymagnesium particle, and wherein the dispersing agent is selected from hexane, heptane, octane, decane, benzene, toluene, xylene, and mixtures thereof.

2. The alkoxymagnesium particle according to claim 1, wherein the titanate compound has a structure of Formula I:
(R.sup.1O).sub.aTi(OR.sup.2).sub.b(OR.sup.3).sub.cX.sub.d  Formula I, wherein R.sup.1, R.sup.2 and R.sup.3 are identical to or different from each other, and are independently H or an alkyl; X is selected from alkoxy, carboxyl, halogen, sulfonic acid group, phosphoric acid group, and sulfuric acid group; and each of a, b, c and d independently represents an integer number in a range of 0 to 4, and a+b+c+d=4.

3. The alkoxymagnesium particle according to claim 1, wherein the halogenating agent is an elementary halogen and/or an inorganic halide, and the mixed alcohol is a linear or branched monohydric alcohol or polyhydric alcohol.

4. The alkoxymagnesium particle according to claim 1, wherein a molar ratio of the halogenating agent to the magnesium powder measured by halogen atoms is (0.0002-0.2):1 and a molar ratio of the mixed alcohol to the magnesium powder is (2-50):1.

5. The alkoxymagnesium particle according to claim 1, wherein the mixed alcohol is a mixture of ethanol and isooctanol and the halogenating agent is a mixture iodine and magnesium chloride.

6. The alkoxymagnesium particle according to claim 5, wherein a molar ratio between the dispersion agent and the titanate compound is the reaction mixture used is 1.3 mol to 1.45 mmol to 1.3 mol to 17.6 mmol.

7. An alkoxymagnesium particle, comprising a titanate compound in the particle, wherein the titanate compound is distributed from an interior and to a surface of the alkoxymagnesium particle and has a bulk density in a range of 0.40 g/cm.sup.3 to 0.47 g/cm.sup.3, and a mass percentage of the titanate compound is 0.1-8.0 wt % of a total weight of the alkoxymagnesium particle.

8. The alkoxymagnesium particle according to claim 7, wherein the titanate compound has a structure as shown in formula I:
(R.sup.1O).sub.aTi(OR.sup.2).sub.b(OR.sup.3).sub.cX.sub.d  Formula I, wherein, R.sup.1, R.sup.2 and R.sup.3 are identical to or different from each other, and are independently selected from a group consisting of H and alkyl; X is selected from a group consisting of alkoxy, carboxyl, halogen, sulfonic acid group, phosphoric acid group, and sulfuric acid group; and each of a, b, c and d independently represents an integer number in a range of 0 to 4, and a+b+c+d=4.

9. The alkoxymagnesium particle according to claim 7, wherein a method for preparing the alkoxymagnesium particle comprises: providing a reaction mixture comprising reactants of 1) a magnesium powder, 2) a mixed alcohol, 3) a halogenating agent, and 4) the titanate compound, and carrying out a reaction in the reaction mixture to form the alkoxymagnesium particle.

10. The alkoxymagnesium particle according to claim 9, wherein a weight ratio of the titanate compound to the magnesium powder is (0.01-5):1.

11. The alkoxymagnesium particle according to claim 9, wherein a molar ratio of the halogenating agent to the magnesium powder measured by halogen atoms is (0.0002-0.2):1.

12. The alkoxymagnesium particle according to claim 9, wherein the reaction mixture further comprises a dispersing agent, and the dispersing agent is an inert organic solvent.

13. A Ziegler-Natta catalyst component, comprising a reaction product of the alkoxymagnesium particle of claim 1, a titanium-containing halide, and an electron donor compound.

14. The catalyst component according to claim 13, wherein the electron donor compound is selected from a carboxylate compound, a 2,3-di-non-linear alkyl-2-cyano disuccinate compound, an aliphatic ether compound, and mixtures thereof, wherein the carboxylate compound is a mono benzoate compound or a phthalate compound as shown in Formula II ##STR00003## wherein, in Formula II, R.sub.1 and R.sub.2 are identical to or different from each other, and are independently selected from the group consisting of substituted or unsubstituted C.sub.1-C.sub.8 alkyl, C.sub.3-C.sub.10 cycloalkyl or C.sub.6-C.sub.20 aryl; R.sub.3-R.sub.6 are independently selected from the group consisting of hydrogen, halogen, C.sub.1-C.sub.4 alkyl, and C.sub.1-C.sub.4 alkoxy, and/or, the 2,3-di-non-linear alkyl-2-cyano disuccinate compound has a structure of Formula III: ##STR00004## wherein, R.sub.1 and R.sub.2 are identical to or different from each other, and each is a linear alky of 1 to 10 carbon atoms, a branched alkyl or cycloalkyl of 3 to 10 carbon atoms, an aryl of 6 to 10 carbon atoms, an alkaryl or aralkyl of 7 to 10 carbon atoms, wherein a hydrogen atom on a carbon in said alkyl, cycloalkyl, aryl, alkaryl or aralkyl is unsubstituted or substituted by a halogen (hetero) atom, alkyl, or alkoxy, and a carbon atom on a main chain is unsubstituted or substituted by a hetero atom; and/or, wherein the aliphatic ether compound is at least one selected from the group consisting of: 2,2′-di-n-propyl-1,3-dimethyl ether, 2,2′-diisopropyl-1,3-dimethyl ether, 2,2′-di-n-butyl-1,3-dimethyl ether, 2,2′-diisobutyl-1,3-dimethyl ether, 2,2′-di-n-pentyl-1,3-dimethyl ether, 2,2′-diisopentyl-1,3-dimethyl ether, 2,2′-di-n-hexyl-1,3-dimethyl ether, 2,2′-diisohexyl-1,3-diether, 2-n-propyl-2-isopropyl-1,3-dimethyl ether, 2-n-propyl-2-n-butyl-1,3-dimethyl ether, 2-n-propyl-2-isobutyl-1,3-dimethyl ether, 2-n-propyl-2-n-pentyl-1,3-dimethyl ether, 2-n-propyl-2-isopentyl-1,3-dimethyl ether, 2-n-propyl-2-n-hexyl-1,3-dimethyl ether, 2-n-propyl-2-isohexyl-1,3-dimethyl ether, 2-isopropyl-2-n-butyl-1,3-dimethyl ether, 2-isopropyl-2-isobutyl-1,3-dimethyl ether, 2-isopropyl-2-n-pentyl-1,3-dimethyl ether, 2-isopropyl-2-isopentyl-1,3-dimethyl ether, 2-isopropyl-2-n-hexyl-1,3-dimethyl ether, 2-isopropyl-2-isohexyl-1,3-dimethyl ether, 2-n-butyl-2-isobutyl-1,3-dimethyl ether, 2-n-butyl-2-n-pentyl-1,3-dimethyl ether, 2-n-butyl-2-isopentyl-1,3-dimethyl ether, 2-n-butyl-2-n-hexyl-1,3-dimethyl ether, 2-n-butyl-2-isohexyl-1,3-dimethyl ether, 2-isobutyl-2-n-pentyl-1,3-dimethyl ether, 2-isobutyl-2-isopentyl-1,3-dimethyl ether, 2-isobutyl-2-n-hexyl-1,3-dimethyl ether, 2-isobutyl-2-isohexyl-1,3-dimethyl ether, 2-n-pentyl-2-isopentyl-1,3-dimethyl ether, 2-n-pentyl-2-n-hexyl-1,3-dimethyl ether, 2-n-pentyl-2-isohexyl-1,3-dimethyl ether, 2-isopentyl-2-n-hexyl-1,3-dimethyl ether, 2-isopentyl-2-isohexyl-1,3-dimethyl ether, and 2-n-hexyl-2-isohexyl-1,3-dimethyl ether and/or, the titanium-containing halide is of Formula IV:
TiX.sub.n(OR.sub.7).sub.4-n  Formula IV wherein, in Formula IV, X is halogen; R.sub.7 is C.sub.1-C.sub.20 alkyl; and n is an integer number in a range of 0-4.

15. A catalyst for olefin polymerization, comprising a reaction product of the following components: (1) the catalyst component according to claim 13; (2) an organic aluminum compound; and (3) optionally, an external electron donor compound.

16. The catalyst according to claim 15, wherein the organic aluminum compound is an organic aluminum compound of Formula AlR′.sub.mX′.sub.3-m, wherein R′ is at least one selected from hydrogen, C.sub.1-C.sub.20 alkyl, and C.sub.6-C.sub.20 aryl; X′ is halogen; and m is an integer number in a range of 1-3; and/or the external electron donor compound is an organic silicon compound of R.sup.4.sub.pR.sup.5.sub.qSi(OR.sup.6).sub.4-p-q, wherein R.sup.4 and R.sup.5 are independently at least one selected from halogen, hydrogen atom, C.sub.1-C.sub.20 alkyl, C.sub.3-C.sub.20 cycloalkyl, C.sub.6-C.sub.20 aryl, and C.sub.1-C.sub.20 haloalkyl; R.sup.6 is selected from C.sub.1-C.sub.20 alkyl, C.sub.3-C.sub.20 cycloalkyl, C.sub.6-C.sub.20 aryl, and C.sub.1-C.sub.20 haloalkyl; and p and q respectively are an integer number in a range of 0-3, and p+q<4.

17. The catalyst according to claim 15, wherein a molar ratio of aluminum in the organic aluminum compound to titanium in the catalyst component is (5-5000):1, and/or a molar ratio of aluminum in the organic aluminum compound to the external electron donor compound is (0.1-500):1.

18. A method of olefin polymerization, comprising contacting olefin with the catalyst according to claim 15 under olefin polymerization conditions, wherein at least one of the olefin is represented by formula CH.sub.2═CHR, in which R is one of hydrogen and C.sub.1-C.sub.6 alkyl.

19. The alkoxymagnesium particle according to claim 1, wherein the titanate compound is at least one selected from tetramethyl titanate, tetraethyl titanate, tetra-n-propyl titanate, tetra-n-butyl titanate, tetra-n-pentyl titanate, tetra-n-hexyl titanate, tetra-n-heptyl titanate, tetra-isooctyl titanate, tetra-n-nonyl titanate, tetra-n-decyl titanate, and isomers thereof.

20. The alkoxymagnesium particle according to claim 5, wherein the reaction is carried out at a temperature from 0° C. to a reflux temperature of the reaction mixture for 2-30 h to obtain the alkoxymagnesium particle.

21. The alkoxymagnesium particle according to claim 7, wherein the titanate compound selected from tetramethyl titanate, tetraethyl titanate, tetra-n-propyl titanate, tetra-n-butyl titanate, tetra-n-pentyl titanate, tetra-n-hexyl titanate, tetra-n-heptyl titanate, tetra-isooctyl titanate, tetra-n-nonyl titanate, tetra-n-decyl titanate, and isomers thereof.

22. The alkoxymagnesium particle according to claim 9, wherein a reaction temperature of the reaction is in a range from 0° C. to a reflux temperature of the reaction mixture for 2-30 h.

23. The catalyst component according to claim 13, wherein an amount of the electron donor compound is 0.005-10 mol relative to an amount of magnesium in 1 mol of a dialkoxymagnesium compound; and/or an amount of the titanium-containing halide is 0.5-100 mol.

24. The catalyst component according to claim 14, wherein: the carboxylate compound is at least one selected from di-n-butyl phthalate, diisobutyl phthalate, diethyl phthalate, dipentyl phthalate, dioctyl phthalate, methyl benzoate, ethyl benzoate, propyl benzoate, isopropyl benzoate, butyl benzoate and isobutyl benzoate; and/or, the 2,3-di-non-linear alkyl-2-cyano disuccinate compound is at least one selected from diethyl 2,3-diisopropyl-2-dicyano succinate, diethyl 2-cyano-2,3-diisopropyl succinate, diethyl 2-cyano-2,3-di-n-butyl succinate, diethyl 2-cyano-2,3-diisobutyl succinate, diethyl 2-cyano-2,3-di-n-pentyl succinate, diethyl 2-cyano-2,3-diisopentyl succinate, diethyl 2-cyano-2-isopropyl-3-n-butyl succinate, diethyl 2-cyano-2-isopropyl-3-isobutyl succinate, diethyl 2-cyano-2-isopropyl-3-n-pentyl succinate, diethyl 2-cyano-2-isopropyl-3-isopentyl succinate, diethyl 2-cyano-2-isopropyl-3-cyclopentyl succinate, diethyl 2-cyano-2-n-butyl-3-isopropyl succinate, diethyl 2-cyano-2-isobutyl-3-isopropyl succinate, diethyl 2-cyano-2-n-pentyl-3-isopropyl succinate, diethyl 2-cyano-2-isopentyl-3-isopropyl succinate, and diethyl 2-cyano-2-cyclopentyl-3-isopropyl succinate; and/or, the aliphatic ether compound is at least one selected from 2-isopropyl-2-(3-methyl butyl)-1,3-dimethoxy propane, 2,2′-diisopropyl-1,3-dimethyl ether, 2,2′-diisobutyl-1,3-dimethyl ether, 2,2′-diisopentyl-1,3-dimethyl ether, 2-isopropyl-2-isobutyl-1,3-dimethyl ether, 2-isopropyl-2-n-pentyl-1,3-dimethyl ether, 2-isopropyl-2-isopentyl-1,3-dimethyl ether, 2-isopropyl-2-isohexyl-1,3-dimethyl ether, 2-isobutyl-2-n-pentyl-1,3-dimethyl ether, 2-isobutyl-2-isopentyl-1,3-dimethyl ether, and 2-n-pentyl-2-isopentyl-1,3-dimethyl ether.

25. The method of olefin polymerization according to claim 18, wherein the olefin polymerization is carried out at a temperature of 0-150° C. for a time duration of 0.1-5 h and under a pressure of 0.01-10 MPa.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a scanning electron microscope photograph of a cross section of alkoxymagnesium particle in a comparative example and an example according to the present invention.

(2) FIG. 2 shows a scanning electron microscope photograph of morphology of alkoxymagnesium particle in a comparative example and an example according to the present invention.

(3) FIG. 3a shows a result of an energy spectrum analysis of Comparative Example 1 according to the present invention.

(4) FIG. 3b shows a result of an energy spectrum analysis of Example 1 according to the present invention.

(5) FIG. 3c shows a result of an energy spectrum analysis according to Example 2 of the present invention.

(6) FIG. 3d shows a result of an energy spectrum analysis according to Example 14 of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(7) The present invention will be described in a detailed way below based on embodiments and the accompanying drawings, but the present invention is not limited by the following embodiments.

(8) It should be noted that, evaluation of alkoxymagnesium particle and polyolefin prepared in embodiments of the present invention is made by the following methods.

(9) 1. A content of titanate in the alkoxymagnesium particle and a content of titanium atoms in an olefin polymerization catalyst component are tested with a 721 spectrophotometer.

(10) 2. A melt index (MI) of a polymer is measured with a XRZ-00 melt indexer by using a method stipulated in GB/T3682-2000.

(11) 3. A particle size and a particle distribution of dialkoxymagnesium and that of a catalyst are measured by using Malvern Mastersizer TM2000 laser diffraction method with n-hexane as a dispersant, wherein SPAN=(D90−D10)/D50.

(12) 4. A content of carboxylate electron donor in an olefin polymerization catalyst component is measured by using a gas chromatography.

(13) 5. An isotactic index (II) of the polymer is measured by the following process: 2 g of a dry polymer sample is placed in an extracter and extracted with boiling heptane for 6 h, and then a residue is dried to constant weight. Isotacticity is calculated by the following formula:
Isotacticity II=mass of the polymer after extraction/2×100%.

(14) 6. A bulk density (BD) of alkoxymagnesium and that of the polymer are measured by a method of the weight of loose solid in each unit volume.

(15) 7. A content (%) of fine powder in the polymer is obtained by sieving the polymer obtained with an 80 mesh sieve, and is a weight percentage of small size powder sieved out in the total polymer.

(16) 8. A scanning electron microscopy—energy spectrum analysis is tested by a Hitachi S-480 cold field emission scanning electron microscope, and testing is performed under a condition that a voltage of the scanning electron microscope is 1 kV.

(17) A TEAM Octane Super energy disperse spectroscopy is used for the testing, and conditions of the testing are: a voltage of 20 KV, an amplification factor of 5000, a take-off angle of 30, a live time of 100 (s), a time constant of an amplifier of 7.68 (μs), and a resolution ratio of 128.2 (eV).

(18) FIG. 1 shows a scanning electron microscope photograph of a cross section of alkoxymagnesium particle in an example and a comparative example according to the present invention, wherein 1a, 1b, 1c and 1d correspond to Comparative Example 1, Example 2, Example 1, and Example 14, respectively. It can be seen from photographs that in the preparation of alkoxymagnesium particle, when a titanate compound is not added, obtained alkoxymagnesium is formed by a combination of polygonal flaky crystals (see 1a in FIG. 1), and after the titanate compound is added, it plays a similar role of cross-linking, so that a structure of the particle is more compact and tighter, some of the flaky crystals being combined by a certain chemical action (see FIGS. 1b, 1c and 1d) and the structure being changed.

(19) FIG. 2 shows a scanning electron microscope photograph of morphology of alkoxymagnesium particle in an example and a comparative example according to the present invention, wherein 2a, 2b, 2c and 2d correspond to Comparative Example 1, Example 2, Example 1, and Example 14, respectively. It can be seen from FIG. 2 that in the preparation of alkoxymagnesium particle, after the titanate compound is added, a structure of the particle is more compact and tighter, flaky crystals are crosslinked gradually so as to form a compact structure. Moreover, as an amount of the titanate compound added increases, the flaky crystals will not be identified finally and form a stable structural body by crosslinking. Besides, after the titanate compound is crosslinked with one particle, a plurality of particles will be crosslinked if the titanate compound is sufficient so as to form a bigger compact structure.

(20) FIG. 3a, FIG. 3b, FIG. 3c and FIG. 3d correspond to an energy spectrum image of Comparative Example 1, Example 2, Example 1, and Example 14, respectively. By characterizing energy spectrum of selected regions in the blocks in FIG. 2, it can be seen that the alkoxymagnesium particle of the examples has titanium element therein, which shows that the titanate compound is contained in the alkoxymagnesium particle (including the interior) of the examples.

Examples 1-14

(21) Preparation of alkoxymagnesium particle: A reactor with a stirrer was equipped with a reflux condenser, a thermometer and a burette. After air in the reactor was fully replaced with nitrogen, ethanol having a water content of less than 200 ppm and a small amount of isooctanol having a water content of less than 200 ppm were added into the reactor, and elementary iodine and magnesium chloride were also added to be dissolved. Magnesium powder (less than 300 μm) and toluene were then added. A certain amount of the titanate compound was added to a feed liquid of a reaction to carry out the reaction. After stirring, a temperature was increased to reach a reflux temperature of the reaction system. The reaction was carried out until the reaction was completed, i.e. no hydrogen was discharged. Then, washing, separating and drying were performed. Additions of respective raw materials and a result are shown in Table 1.

(22) Preparation of a solid catalyst component by using the alkoxymagnesium particle prepared: 10 mL of toluene and 90 mL of titanium tetrachloride were added into a 300 mL reactor after air therein was repeatedly replaced with high purity nitrogen. After a temperature is increased to 50° C., a suspension prepared with 10 g of the akoxymagnesium particle prepared, 50 mL of toluene, and 1.2 mL of an electron donor compound, i.e., di-n-butyl phthalate (abbreviated as “DNBP” in Table 1), or diethyl 2,3-diisopropyl-2-dicyano succinate (abbreviated as “JS” in the Table 1), or 2-isopropyl-2-(3-methyl butyl)-1,3-dimethoxy propane (abbreviated as “2# ether” in Table 1), was added. The temperature was slowly increased up to 115° C. and maintained for 2 h, and then liquid was removed by filtration under reduced pressure. Then a mixed solution of 30 mL of titanium tetrachloride and 120 mL of toluene was added. After the temperature was increased to 110° C., 1.5 mL of the electron donor compound, i.e., di-n-butyl phthalate (abbreviated as “DNBP” in Table 1), or diethyl 2,3-diisopropyl-2-dicyano succinate (abbreviated as “JS” in Table 1), or 2-isopropyl-2-(3-methyl butyl)-1,3-dimethoxy propane (abbreviated as “2# ether” in Table 1) was added. After a stirring treatment is performed for 1 h, the liquid was removed by filtration under reduced pressure. Then, a mixed solution of 30 mL of titanium tetrachloride and 120 mL of toluene was added. The temperature was increased to 110° C., and a stirring treatment was performed for 1 h. Such treatment was repeated for 2 times, and the liquid was removed by filtration. An obtained solid was washed with 150 mL of hexane for 4 times at a temperature of 60° C., and the liquid was removed by filtration. After drying was performed, solid powder was obtained, which is the solid catalyst component. Specific data are shown in Table 1.

(23) Propylene polymerization: In a 5 L autoclave, nitrogen gas flow was used for purging for 1 h at a temperature of 70° C., and then 5 mL of a hexane solution of triethyl aluminium (a concentration of triethyl aluminium is 0.5 mmol/ml), 1 mL of a hexane solution of cyclohexyl methyl dimethoxy silane (CHMMS) (a concentration of CHMMS is 0.10 mmol/ml), 10 mL of anhydrous hexane and 10 mg of the solid catalyst component were introduced in the nitrogen gas stream at room temperature. After the autoclave was closed, 1 L of hydrogen (in the standard state) and 2.0 L of liquid propylene were introduced. Then the temperature was increased to 70° C. in 10 min under stirring. After a polymerization was carried out at 70° C. for 2 h, the stirring was stopped. Unpolymerized propylene monomers were removed, and polymers were collected for testing. Specific data are shown in Table 1.

Comparative Examples 1-2

(24) Preparation of an alkoxymagnesium carrier: A reactor with a stirrer was equipped with a reflux condenser, a thermometer and a burette. After air in the reactor was fully replaced with nitrogen, ethanol and a small amount of isooctanol were added into the reactor, and elementary iodine and magnesium chloride were also added to be dissolved. Magnesium powder and toluene were then added. A titanate compound having a certain structure was added to a feed liquid of a reaction to carry out the reaction. After stirring, a temperature was increased to reach a reflux temperature of a reaction system. The reaction was carried out until the reaction was completed, i.e. no hydrogen was discharged. Then, washing, separating and drying were performed. Additions of respective raw materials and a result are shown in Table 1.

(25) Preparation of a catalyst: A process is same as that in Example 1.

(26) Propylene polymerization: A process is same as that in Example 1.

(27) Specific data are shown in Table 1.

Comparative Example 3

(28) Preparation of an alkoxymagnesium carrier: A process is same as that in Example 2 except that no tetrabutyl titanate was added in the preparation process. A result is shown in Table 1.

(29) Preparation of a catalyst: A solid catalyst component was prepared by using alkoxymagnesium particle prepared. 10 mL of toluene and 90 mL of titanium tetrachloride were added into a 300 mL reactor after air therein was repeatedly replaced with high purity nitrogen. After a temperature was increased to 50° C., a suspension prepared with 10 g of the akoxymagnesium particle prepared, 50 mL of toluene, and 1.2 mL of a carboxylate ester (di-n-butyl phthalate DNBP is used for explanation, but the carboxylate ester is not limited to this compound) was added. The temperature was slowly increased, and when the temperature reached 80° C., 5 g of tetrabutyl titanate was added. The temperature was increased up to 115° C. and maintained for 2 h, and then liquid was removed by filtration under reduced pressure. Then a mixed solution of 30 mL of titanium tetrachloride and 120 mL of toluene was added. After the temperature was increased to 110° C., 1.5 mL of DNBP was added by dropping. After a stirring treatment is performed for 1 h, the liquid was removed by filtration under reduced pressure. Then, a mixed solution of 120 mL of titanium tetrachloride and 30 mL of toluene was added. The temperature was increased to 110° C., and a stirring treatment was performed for 1 h. Such treatment was repeated for 2 times, and the liquid is removed by filtration. An obtained solid was washed with 150 mL of hexane for 4 times at a temperature of 60° C., and the liquid was removed by filtration. After drying was performed, solid powder was obtained, which is the solid catalyst component. Specific data are shown in Table 1.

(30) Propylene polymerization: A process is same as that in Example 1.

(31) Specific data are shown in Table 1.

(32) TABLE-US-00001 TABLE 1 Data of added materials and results for carriers and catalysts examples and comparative examples No. Example Example Example Example Example Example Example Example item material 1 2 3 4 5 6 7 8 Raw Magnesium 32 32 32 32 32 32 32 32 materials powder [g] for Ethanol 260 260 380 260 260 380 260 260 preparing [ml] a carrier Isooctanol 10 20 10 20 10 10 20 10 [ml] Elementary 1.6 1.6 2.0 1.6 1.6 2.0 1.6 1.6 iodine [g] Magnesium 0.4 0.4 0.6 0.4 0.4 0.6 0.4 0.4 chloride [g] Titanate Tetrabutyl Tetrabutyl Tetrabutyl Tetraethyl Tetraethyl Tetraethyl Tetra- Tetra- [g] titanate titanate titanate titanate titanate titanate isopropyl isopropyl 5.0 0.5 60 0.5 5.0 60 titanate titanate 0.5 5.0 Toluene [ml] 120 120 0 120 120 0 120 120 Alkoxy- d50 [μm] 33.5 32.2 37.6 31.2 32.1 36.5 33.3 35.9 magnesium Span 0.82 0.70 0.80 0.82 0.81 0.96 0.72 0.88 carrier BD[g/cm.sup.3] 0.45 0.42 0.46 0.40 0.44 0.45 0.40 0.43 Titanate 1.1 0.2 5.5 0.5 1.7 6.8 0.3 1.5 content [wt %] Catalyst Titanate 0 0 0 0 0 0 0 0 addition [g] Titanium 2.6 2.5 3.2 2.7 2.9 3.5 2.6 2.8 content [wt %] Electron DNBP DNBP DNBP DNBP DNBP DNBP DNBP DNBP donor 13.0 13.2 14.1 13.1 13.5 14.3 12.8 13.6 content [wt %] Activity 77.8 76.5 71.1 75.5 76.9 70.8 72.2 73.5 [KgPP/gCat] Polymer BD[g/cm.sup.3] 0.43 0.41 0.44 0.41 0.42 0.43 0.41 0.42 MI[g/10 min] 2.9 2.6 3.1 2.8 2.7 3.2 2.9 3.0 Fine powder 0.2 0.4 0.3 0.4 0.3 0.3 0.3 0.3 [wt %] II[g/10 min] 98.9 98.7 98.6 98.7 98.8 98.5 98.7 98.6 No. Comparative Comparative Comparative Example Example Example Example Example Example Example Example Example item material 9 10 11 12 13 14 1 2 3 Raw Magnesium 32 32 32 32 32 32 32 32 32 materials powder [g] for Ethanol 380 260 260 380 380 260 260 630 260 preparing [ml] a carrier Isooctanol 10 10 10 10 10 10 20 0 10 [ml] Elemetary 2.0 1.6 1.6 2.0 2.0 2.5 1.6 1.0 1.6 iodine [g] Magnesium 0.6 0.4 0.4 0.6 0.6 0.6 0.4 0 0.4 chloride[g] Titanate Tetra- Tetrabutyl Tetrabutyl Tetrabutyl Tetrabutyl Tetrabutyl 0 0 0 [g] isopropyl titanate titanate titanate titanate titanate titanate 5.0 5.0 90 120 160 60 Toluene [ml] 0 120 120 0 0 0 120 0 120 Alkoxy- d50 [μm] 39.8 33.5 33.5 55.7 66.8 88.6 33.3 8.4 31.2 magnesium Span 0.95 0.82 0.82 0.86 0.98 1.51 0.75 1.62 0.89 carrier BD[g/cm.sup.3] 0.44 0.45 0.45 0.46 0.46 0.47 0.36 0.28 0.35 Titanate 6.2 1.1 1.1 7.0 7.7 9.7 0 0 0 content [wt %] Catalyst Titanate 0 0 0 0 0 0 0 0 5.0 addition [ml] Titanium 3.1 3.3 3.1 3.3 3.5 3.9 2.4 2.5 2.6 content [wt %] Electron DNBP JS 2#ester12.1 DNBP DNBP DNBP DNBP DNBP DNBP donor 14.8 11.0 14.6 15.0 15.2 12.7 12.0 13.0 content [wt %] Activity 66.7 67.8 93.6 71.3 67.9 56.3 75.2 72.7 68.7 [KgPP/gCat] Polymer BD[g/cm.sup.3] 0.43 0.41 0.42 0.45 0.42 0.42 0.39 0.38 0.39 MI 3.5 0.3 5.1 3.3 3.5 4.0 2.7 2.9 2.1 [g/10 min] Fine powder 0.5 0.3 0.5 0.2 0.5 1.1 0.4 1.5 0.5 [wt %] II 98.3 98.0 99.1 98.5 98.3 98.0 98.7 98.5 98.4 [g/10 min]

(33) It can be seen from the data in Table 1 that alkoxymagnesium particle of the present invention have a more compact structure and a significantly improved bulk density; and when a mixed alcohol and a mixed halogenating agent are used, the alkoxymagnesium particle can have a good morphology and uniform distribution. When a propylene polymerization is carried out using a catalyst provided by the present invention, a bulk density of an obtained polymer can be remarkably improved, and the bulk density of the polymer can be increased by 10% or more under same conditions (e.g., Comparative Embodiment 1 and Embodiment 1). At the same time, polymerization activity is high, and polymer particle have a small content of fine powder and better fluidity, which is advantageous for long-term stable application of the catalyst on a large-scale propylene polymerization apparatus. The catalyst has broad application prospects.

(34) The present disclosure is explained in combination with some embodiments hereinabove. However, various improvements can be made to the embodiments, and substances therein can be substituted by equivalents without departing from the protection scope of the present disclosure. Respective features disclosed in respective embodiments of the present disclosure can be combined with one another in any way, and no exhaustive description is made to the combinations only for saving space and resources. The present disclosure is not limited by the specific embodiments disclosed herein, but includes all technical solutions falling into the protection scope of the claims.