Metallocene catalyst component for preparing polyethylene wax and application thereof
A metallocene catalyst and polyethylene wax technology are applied in the field of metallocene catalysts for preparing polyethylene wax, and can solve the problem of interference with the molecular weight and molecular weight distribution of polyethylene wax products, increase in the number of unsaturated bonds in polyethylene wax products, and problems with polyethylene wax products. Stability performance decline and other problems, to achieve no hydrogen release effect, stable product performance, good hydrogen sensitivity
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Embodiment 1
[0032] Preparation of solid catalyst components
[0033] Weigh 10 g of granular silica gel (Davison 955) that has been calcined at 600 ° C for 4 hours for dehydroxylation treatment, add it to a four-necked reaction flask replaced by nitrogen, add 50 ml of toluene, start stirring, and then continue to add MMAO solution (that is, 1 mol / L of butane D-modified methylaluminoxane toluene solution) 30ml, heated to 90°C within 30min and reacted at this temperature for 1hr, then cooled to 25°C, and slowly added (pentamethylcyclopentadienyl) ( n-Propylcyclopentadienyl) zirconium dichloride solution 5ml (1.0mol / L toluene solution), then continue to drop slowly into MMAO solution (i.e. 10wt% methylaluminoxane toluene solution) 20ml, be warming up to 60 ℃ , and react at this temperature for 1 hr, then filter, wash, and dry to obtain solid catalyst component 1. The Zr content of the catalyst is 3.79% (wt).
[0034] Ethylene polymerization
[0035] Add 1L of hexane to the 2L polymerizatio...
Embodiment 2
[0038] Preparation of solid catalyst components
[0039] Except that the metallocene catalyst compound is (tetramethylcyclopentadienyl)(n-propylcyclopentadienyl)zirconium dichloride, others are as in Example 1. The Zr content of the catalyst is 3.65% (wt).
[0040] Ethylene polymerization
[0041] Add 1L of hexane into the 2L polymerization kettle that has been purged with hydrogen, start stirring, then add 6ml of 1mol / L n-octyl-modified methylaluminoxane toluene solution and 30mg of catalyst 1 prepared above, and add hydrogen to make the kettle The internal pressure reaches 0.05MPa, and after the hydrogenation is completed, ethylene is introduced to make the total pressure in the kettle reach 0.9MPa (gauge pressure), and the temperature is raised to a reaction temperature of 60°C, and ethylene is added as needed at this temperature to maintain a total pressure of 0.9 MPa in the kettle. MPa polymerization reaction for 1 hour, cooling down and discharging.
[0042] Obtain po...
Embodiment 3
[0044] The metallocene catalyst is not loaded, and is added to the polymerization reactor in the form of a homogeneous catalyst.
[0045] Ethylene polymerization
[0046] Add 1L of hexane to the 2L polymerizer that has been purged with hydrogen, start stirring, and then add 10ml of 1mol / L n-octyl-modified methylalumoxane toluene solution and 10 μmol (tetramethylcyclopentadienyl) ( n-propylcyclopentadienyl) zirconium dichloride, catalyst 1 above-mentioned making, add hydrogen and make pressure in the still reach 0.02MPa, pass into ethylene again after finishing hydrogenation and make total pressure in the still reach 0.9MPa (gauge pressure ), the temperature was raised to a reaction temperature of 60°C, and ethylene was added as needed at this temperature to maintain a total pressure of 0.9 MPa in the kettle, and the polymerization reaction was carried out for 1 hour, and the temperature was lowered to discharge.
[0047] Obtain polyethylene wax powder material 103g, other dat...
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