A kind of preparation method of impact-resistant polypropylene
A technology of polypropylene and propylene, which is applied in the field of preparation of impact polypropylene, can solve the problems of low efficiency of circulating air heat exchanger, high cost of equipment transformation, and decrease of equipment production capacity, so as to meet the heat removal capacity and prevent the phenomenon of sticking , The effect of reducing production energy consumption
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preparation example
[0052] This preparation example is used to prepare the titanium-containing solid catalyst component in the Ziegler-Natta catalyst.
[0053] After fully replacing the 16L pressure-resistant reactor with agitator with nitrogen, add 10L ethanol, 300mL 2-ethylhexanol, 11.2g iodine, 8g magnesium chloride and 640g magnesium powder into the reactor. While stirring, the system was refluxed until no more hydrogen was emitted. The reaction was stopped, and the product was washed with 3L of ethanol, filtered, and dried to obtain an alkoxymagnesium carrier. The alkoxy magnesium carrier D50=30.2um, Span=0.81, m=0.015. Take 650 g of the above alkoxymagnesium carrier and 3250 mL of toluene to prepare a suspension. In a 16L pressure-resistant reactor that has been repeatedly replaced by high-purity nitrogen, add 2600 mL of toluene and 3900 mL of titanium tetrachloride, raise the temperature to 80 ° C, then add the prepared suspension to the kettle, keep the temperature for 1 hour, and add p...
Embodiment 1
[0055] This example is used to illustrate that nitrous oxide can increase the reactivity ratio of ethylene in the method for preparing impact polypropylene with high ethylene content.
[0056] 1) Raw material
[0057] The Ziegler-Natta catalyst obtained in the preparation example is used as the main catalyst; triethylaluminum is the cocatalyst; diisopropyldimethoxysilane (DIPDMS) is the external electron donor; propylene, ethylene and hydrogen are polymerization grades , used after removal of water and oxygen; hexane used after dehydration; nitrous oxide and nitrogen are used as a mixed gas at a molar ratio of 1:25.
[0058] 2) Test device
[0059] A polymerization process in which two horizontal tank gas phase reactors are connected in series is adopted. The volume of the horizontal tank gas phase reactor is 0.2 cubic meters, the stirring blade is a T-shaped inclined blade, the inclination angle is 10 degrees, and the stirring speed is 100 rpm.
[0060] 3) Test process
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Embodiment 2
[0065] In Example 2 and Example 3, except that the addition of nitrous oxide in the (2) step propylene and ethylene gas phase copolymerization process of the test process is different, other conditions are the same as Example 1, and the specific process conditions and test results are shown in Table 1 .
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