Ultrahigh molecular weight polyethylene catalyst preparation method and catalyst prepared by same and application of catalyst
An ultra-high molecular weight, polyethylene technology, applied in the production of bulk chemicals, etc., can solve the problems of not wide adjustment range of product molecular weight, low catalyst activity, etc., and achieve the effect of favorable processing, narrow particle size distribution and high bulk density
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Embodiment 1
[0034] 1. Catalyst synthesis (the ratio of butanediol to magnesium chloride is 0.88ml / g): the reaction bottle is vacuum-baked and fully replaced with high-purity nitrogen. Take 2g of silica gel and 30ml of tetrahydrofuran, add 0.5ml of 1,4-butanediol, and stir magnetically until the dispersion is uniform. Take 0.57g of magnesium chloride and 30ml of tetrahydrofuran, magnetically stir at 60°C until they are completely dissolved, slowly transfer them to the silica gel tetrahydrofuran solution, and a precipitate appears. After stirring for 2 hours, the precipitate is separated, washed four times with n-hexane, and dispersed after vacuum drying. In n-hexane, add 8ml of triethylaluminum in isopentane solution (0.57mol / L), stir and react at 60°C for 1h, separate the precipitate, wash and dry it, then disperse it in n-hexane, then add 2ml of tetrachloromethane Titanium oxide was stirred and reacted at 60° C. for 2 h, washed with n-hexane for more than three times, and vacuum-dried to...
Embodiment 2
[0037] 1, catalyst is synthesized (butanediol and magnesium chloride consumption ratio are 1.3ml / g): except that the addition of magnesium chloride is changed into 0.38g, all the other preparation processes are the same as embodiment 1, obtain solid catalyst 2.3g.
[0038] 2. Ethylene polymerization: The polymerization process is the same as in Example 1, and the polymerization results are shown in the attached table.
Embodiment 3
[0040] 1, catalyst is synthesized (butanediol and magnesium chloride consumption ratio are 2.6ml / g): except that the addition of magnesium chloride is changed into 0.19g, all the other preparation processes are the same as embodiment 1, obtain solid catalyst 2.2g.
[0041] 2. Ethylene polymerization: The polymerization process is the same as in Example 1, and the polymerization results are shown in the attached table.
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