Catalytic system for preparation of low-molecular-weight polypropylene, low-molecular-weight polypropylene, and preparation method for low-molecular-weight polypropylene
A catalytic system and low molecular weight technology, which is applied in the field of low molecular weight polypropylene and low molecular weight polypropylene preparation, can solve the problem of high molecular weight polypropylene and achieve high-efficiency preparation
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[0041] According to the second aspect of the present invention, the present invention provides a method for preparing low-molecular-weight polypropylene, the preparation method comprising: contacting the above-mentioned components of the catalytic system under olefin polymerization reaction conditions.
[0042] The olefin polymerization reaction of the present invention is carried out according to known polymerization methods. For example, the olefin polymerization reaction can be carried out in liquid phase or gas phase, or can also be carried out under the operation of combining liquid phase and gas phase polymerization stages. Conventional techniques such as slurry method, gas-phase fluidized bed, etc. are used. The polymerization temperature may be 0 to 150°C, preferably 60 to 90°C.
[0043] The medium used for liquid phase polymerization can be selected from saturated aliphatic hydrocarbons such as isobutane, hexane, heptane, cyclohexane, naphtha, raffinate, hydrogenated ...
Embodiment 1
[0052] Fully dry the 250mL polymerization bottle, vacuumize and flush with nitrogen, repeat three times. Vacuumize, controlled by a solenoid valve, fill with 1 atmosphere of propylene, add 26.5 ml of toluene at 70 ° C, add 1.5 mL of MAO toluene solution (2.5 mmol), add 1 ml of diethylzinc toluene solution (100 micromol), 1 ml of rac-dimethylsilyl[bis(2-methyl-4-phenylindenyl)]zirconium dichloride in toluene (2.0 micromole) and start the timer. After 20 minutes, close the propylene, pour the reaction solution into a beaker, add acidified ethanol, stir for more than 6 hours, filter to obtain the polymer, vacuum dry at 60°C for 24 hours, weigh to obtain 3.78 grams of the polymer, and the gel penetration of the polymer Chromatograms such as figure 1 shown. The aggregation results are shown in Table 1.
Embodiment 2
[0054] Fully dry the 250mL polymerization bottle, vacuumize and flush with nitrogen, repeat three times. Vacuumize, controlled by a solenoid valve, fill with 1 atmosphere of propylene, add 25.5 ml of toluene at 80 ° C, add 1.5 mL of MAO toluene solution (2.5 mmol), add 2 ml of diethylzinc toluene solution (200 micromol), 1 ml of rac-dimethylsilyl[bis(2-methyl-4-phenylindenyl)]zirconium dichloride in toluene (2.0 micromole) and start the timer. After 20 minutes, turn off the propylene, pour the reaction solution into a beaker, add acidified ethanol, stir for more than 6 hours, filter to obtain the polymer, vacuum dry at 60°C for 24 hours, and weigh to obtain 3.08 grams of the polymer. The aggregation results are shown in Table 1.
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