Catalyst for ethylene and alpha-olefin copolymerization and preparation method thereof
A technology of olefin copolymerization and catalyst, which is applied in the field of olefin polymerization catalysts, can solve the problems of not realizing the copolymerization of ethylene and 1-hexene, uneven distribution of 1-hexene, and difficult separation of catalyst solids, etc., and achieves low cost and good shape , the effect of convenient operation
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Embodiment 1
[0039] This embodiment provides a catalyst for the copolymerization of ethylene and α-olefin, which is prepared by the following steps:
[0040] (1) Add 2 grams of anhydrous magnesium chloride, 60 milliliters of hexane and 6.5 milliliters of isobutanol into a three-necked flask replaced by argon, stir and heat to 70° C., then react for 3 hours to obtain a suspension;
[0041] (2) Add 0.18 ml of tributyl phosphate to the suspension, stir and react at 70°C for 1 hour, then add 0.6 ml of tetraethoxysilane, and stir and react at 70°C for 1 hour;
[0042] (3) Cool down to room temperature, slowly add 47 ml of titanium tetrachloride dropwise, the dropwise addition time is 90 minutes, gradually warm up to 70°C, the heating time is 2 hours, and then stir and react for 2 hours;
[0043] (4) Then press filter the supernatant, add 50 ml of n-hexane, heat up to 70°C, add 0.10 ml of tetraethoxysilane, stir for 1 hour, then add 0.12 ml of tributyl phosphate, stir for 1 hour ;
[0044] (5)...
Embodiment 2
[0048] This embodiment provides a catalyst for the copolymerization of ethylene and α-olefin, the preparation method of which is the same as that of Example 1, except that:
[0049] 12 milliliters of isobutanol consumptions in the step (1).
[0050] In step (2), diisobutyl phthalate is used to replace tributyl phosphate, and the consumption is 0.06 milliliters; tetraethoxysilane is replaced with isobutyltrimethoxysilane, and the consumption is 0.17 milliliters.
[0051] The amount of titanium tetrachloride used in step (3) was 83 milliliters, the time for dropping was 2 hours, and the reaction time was 1 hour.
[0052] In step (4), replace tetraethoxysilane with isobutyltrimethoxysilane, and its consumption is 0.03 milliliters, and the reaction time is 2 hours; Replace tributyl phosphate with diisobutyl phthalate, and its consumption is 0.22 milliliters , the reaction time is 2 hours.
[0053] In the step (5), the consumption of titanium tetrachloride is 42 milliliters, and ...
Embodiment 3
[0056] This embodiment provides a catalyst for the copolymerization of ethylene and α-olefin, the preparation method of which is the same as that of Example 1, except that:
[0057] In the step (1), the consumption of isobutanol is 4.30 milliliters.
[0058] In step (2), diethyl succinate was used to replace tributyl phosphate, and the amount was 0.30 ml; 3-chloropropyltriethoxysilane was used to replace tetraethoxysilane, and the amount was 0.21 ml.
[0059] In the step (3), the amount of titanium tetrachloride is 31 milliliters, the time for dropping is 2 hours, and the reaction time is 1 hour.
[0060] In step (4), replace tetraethoxysilane with 3-chloropropyltriethoxysilane, and its consumption is 0.04 milliliters, and the reaction time is 2 hours; Replace tributyl phosphate with diethyl succinate, and its consumption is 0.15 ml.
[0061] 15.50 milliliters of titanium tetrachloride consumptions in the step (5).
[0062] The titanium content of the prepared solid catalys...
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