Catalyzer for ethylene polymerization and copolymerization and preparing method thereof
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A technology of ethylene polymerization and copolymerization, which is applied in the field of main catalyst components and ethylene polymerization technology, and can solve the problem of high catalyst preparation cost
Inactive Publication Date: 2009-01-28
BEIJING UNIV OF CHEM TECH
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Catalyst preparation costs are high
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Embodiment 1
[0040] (1) Preparation of catalyst components: In the reactor fully replaced by nitrogen, add 5g of magnesium dichloride, 7.5ml of epichlorohydrin, 10.5ml of tributyl phosphate, 75ml of toluene, 3ml of hexane, and 6.2ml of ethanol in sequence , the temperature was raised to 60°C under stirring, and after the solid was completely dissolved to form a uniform solution, the temperature was kept constant for 1h. Cool down to -25°C, add 58ml of titanium tetrachloride dropwise, then add 3.5ml of tetraethoxysilane, react for 1h, keep the temperature at -10°C for 1h, keep the temperature at 0°C for 1h, keep the temperature at 20°C for 1h, slowly raise the temperature to 80°C, keep the temperature Reaction 2h. Stirring was stopped, the suspension was allowed to stand, the layers were separated slowly, the supernatant was extracted, washed twice with toluene and twice with hexane, and dried with nitrogen to obtain a main catalyst component with good fluidity and narrow particle size dist...
Embodiment 2
[0044] (1) Except not adding tetraethoxysilane, others are the same as Example 1.
[0045] (2) Catalyst evaluation condition is only AlEt 3 The amount of solution is changed into 1.06ml, and other conditions are with embodiment 1. The experimental results are shown in Table 1.
Embodiment 3
[0047] (1) Except that the amount of hexane is changed to 3.8ml, other conditions are the same as in Example 1, the suspension is allowed to stand, the layering is relatively slow, the supernatant is extracted, washed twice with toluene, and washed twice with hexane, Blow dry with nitrogen to obtain the main catalyst component with good fluidity and narrow particle size distribution.
[0048] (2) Catalyst evaluation condition is only AlEt 3 The amount of solution is changed into 1.25ml, and other conditions are with embodiment 1. The experimental results are shown in Table 1.
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Abstract
A catalyst for the polymerization or copolymerization of ethene and a preparation method thereof belong to the field of an olefin polymerization catalyst. The catalyst includes a main catalyst component and at least one organic aluminum compound; the main catalyst component includes a magnesium compound, at least one titanium compound and at least one organic alcohol compound. The magnesium compound is an output obtained by dissolving magnesium halide in a mixed solvent which contains an organic epoxide and an organic phosphor compound. During the preparation process of the catalyst, an alkane compound is used as an agent for assisting precipitation. The catalyst is provided with high catalytic activity and better hydrogen response. Simultaneously, the invention also relates to a preparation technique for the catalyst for the polymerization or copolymerization of the ethene. The catalyst is applied to the techniques of slurry polymerization and gas phase fluidized bed or combination; the grain diameters of the obtained polymer are uniform; in addition, the grain diameters are narrowly arranged.
Description
technical field [0001] The invention relates to a main catalyst component for ethylene polymerization or ethylene and comonomer copolymerization, the catalyst has high catalytic activity and makes the obtained ethylene polymer have excellent particle properties; it also relates to an ethylene A preparation process of a polymerization catalyst and an ethylene polymerization process using the catalyst. The invention belongs to the field of olefin polymerization catalyst and olefin polymerization. Background technique [0002] Olefin polymerization catalysts are the core of polyolefin polymerization technology. From the perspective of the development of olefin polymerization catalysts, there are two main aspects: (1) the development of polyolefin resin catalysts that can prepare special properties or better properties, such as metallocene catalysts (2) For the production of general-purpose polyolefin resins, on the basis of further improving catalyst performance, simplify the ...
Claims
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