Solubilized ultrahigh molecular weight ultrafine polyethylene and its preparation method
An ultra-high molecular weight, polyethylene technology, used in the field of solubilizing polymers and their preparation, can solve the problems of single component, high price, and reduced catalyst activity, and achieve the advantages of speeding up the process flow, excellent processing performance, and energy saving. Effect
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[0038] [Catalyst preparation method]
[0039] The catalyst used in the preparation method of the present invention can be prepared by the method disclosed in the invention patent application submitted by the applicant (application number 201510271254.1), the entirety of which is incorporated in this application as a reference.
[0040] Specifically, the catalyst used in the preparation method of the present invention is prepared by a method comprising the following steps:
[0041] (a) magnesium halide, alcohol compound, auxiliary agent, part of the internal electron donor and solvent are mixed to prepare mixture I;
[0042] (b) Add the above-mentioned mixture I into the reactor, preheat to -30°C to 30°C, and add the titanium compound dropwise; or, add the titanium compound to the reactor, preheat to -30°C to 30°C, add dropwise the above-mentioned mixture I;
[0043] (c) After the dropwise addition is completed, the temperature of the reaction system is raised to 90°C-130°C a...
Embodiment 1
[0096] In the reactor fully replaced by high-purity nitrogen, add 4.94g of anhydrous magnesium chloride, 18.9g of isooctyl alcohol, and 30ml of decane in sequence, raise the temperature to 130°C under stirring, and maintain it for 2 hours, then add 2.65g of tetrabutyl titanate The ester and 2.05g of diisobutyl phthalate were reacted at 130°C for 1 hour, and finally cooled to room temperature to form a homogeneous transparent solution, namely mixture I.
[0097] Add 200ml of titanium tetrachloride to the reaction kettle, stir and preheat to 0°C, add the mixture I dropwise to the titanium tetrachloride in about 2 hours. After the dropwise addition was completed, the temperature was raised to 110° C. within 2 hours. 1.23 g of internal electron donor diisobutyl phthalate was added. After reacting at this temperature for 2 hours, remove the reaction liquid, add 200ml of titanium tetrachloride again, and react for 2 hours. Finally, the reaction liquid was removed, and the remainin...
Embodiment 2
[0103] Ethylene homopolymer and its preparation
[0104] The preparation method of catalyst is the same as embodiment 1.
[0105] Slurry Polymerization of Ethylene:
[0106] Using the slurry polymerization process, first pretreat the polymerization tank (under the protection of high-purity nitrogen, dry and deoxygenate the 5L high-pressure reactor), add 500 g of n-pentane as a dispersion medium, then add 150 mL of n-hexane, 20 mg of the above-mentioned Catalyst and triethylaluminum 12ml, then feed ethylene gas to maintain 0.7MPa; Wherein, in ethylene, carbon monoxide content is less than 5ppm, carbon dioxide is less than 15ppm, and conjugated diene content is less than 10ppm; Polymerization reaction starts, and system temperature maintains 70°C, and the reaction time is 30 minutes. Cool down after the polymerization reaction, discharge the slurry material directly from the bottom valve, add the required amount of white oil, and distill off the dispersion medium to obtain the...
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