A kind of ethylene polymerization catalyst and preparation method thereof
A technology of ethylene polymerization and catalyst, which is applied in the field of ethylene polymerization catalyst and its preparation, which can solve the problems of affecting the shape of final polymer particles, poor reaction stability, and high initial activity of polymerization, and achieve increased strength, concentrated particle size distribution, and stable polymerization reaction. Effect
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Embodiment 1
[0052] Preparation of catalyst:
[0053] (1) Under the protection of room temperature and nitrogen, add 80ml of hexane solution of dibutylmagnesium compound with a concentration of 0.8186mol / L, 80ml of hexane and 2.428g of triethylaluminum to a 0.5 liter reactor with electromagnetic stirring. , The reaction was stirred for 0.5 hours. Then use a metering pump to slowly add a solution composed of 19.468 g of diethylhexanol and 40 ml of hexane at a constant speed. The addition time is 35 minutes. After the addition, the reaction is maintained for 1 hour. Finally, 6.1g of epichlorohydrin was added, the temperature was raised to 50°C, and the reaction was kept for 2 hours to obtain magnesium complex solution A;
[0054] (2) Cool the reaction kettle to -25°C, and slowly add a solution of 11.42g titanium tetrachloride and 40ml hexane with a metering pump at a constant speed. The addition time is 45 minutes. After the addition, keep it at this temperature and react for 2 hours. Get solut...
Embodiment 2
[0063] Preparation of catalyst:
[0064] (1) At room temperature and under the protection of nitrogen, add 70ml of heptane solution of 1.0336mol / L butyloctylmagnesium compound, 80ml of n-heptane and triisobutyl to a 0.5 liter reactor with electromagnetic stirring. Aluminum 8.14g, stirred and reacted for 0.5 hour. Then use a metering pump to slowly add a solution consisting of 26.66 g of diethylhexanol and 40 ml of heptane at a constant speed for 1.0 hr. After the addition, keep the reaction for 2 hours. Finally, 6.8g of tetrahydrofuran was added, the temperature was raised to 50°C, and the reaction was kept for 2 hours to obtain magnesium complex solution A;
[0065] (2) Cool the reaction kettle to -15°C, use a metering pump to slowly add a solution of 7.16g titanium tetrachloride and 30ml heptane at a constant speed. The addition time is 0.5 hours. After the addition, keep it at this temperature and react for 3 hours. Get solution B;
[0066] (3) Replace the nitrogen in the react...
Embodiment 3
[0072] Preparation of catalyst:
[0073] (1) Under the protection of room temperature and nitrogen, add 80ml of hexane solution of dibutylmagnesium compound with a concentration of 0.8186mol / L, 80ml of hexane and 3.86 of triisobutylaluminum to a 0.5L reactor with electromagnetic stirring. g, stir and react for 1 hour. Then use a metering pump to slowly add a solution consisting of 9.77 g of isobutanol and 40 ml of hexane at a constant speed. The addition time is 35 minutes. After the addition, the reaction is maintained for 1 hour. Finally, 13.4g of epichlorohydrin was added, the temperature was raised to 50°C, and the reaction was kept for 2 hours to obtain magnesium complex solution A;
[0074] (2) Cool the reaction kettle to -30°C, use a metering pump to slowly add a solution of 23.1g titanium tetrachloride and 60ml hexane at a constant rate. The addition time is 1.5 hours. After the addition, keep it at this temperature and react for 2 hours. Get solution B;
[0075] (3) Repla...
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