Application of organosilane in the preparation of high-density polyethylene and high-density polyethylene and its preparation method and application
A high-density polyethylene and organosilane technology, which is used in the preparation of high-density polyethylene and the application field of high-density polyethylene, can solve the problem of not being able to provide high-melt strength polyethylene products, low utilization efficiency of comonomers, and impact on Polymer properties and other issues, to achieve the effect of improving strain hardening effect, high crystallinity, and improving melt strength
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[0024] The main improvement of the method for preparing high-density polyethylene provided by the present invention is that before the ethylene polymerization reaction and / or during the ethylene polymerization reaction, add the general structure formula R to the polymerization reaction system 1 SiX 2 R 2 For organosilanes, the polymer is steam treated after the polymerization reaction is complete. Catalyst selection Ziegler-Natta catalyst and chromium-based catalyst, ethylene polymerization method and conditions can be conventional selection in the field.
[0025] According to the present invention, various existing substances that can be used to catalyze the polymerization reaction of olefin monomers can be used, and specific examples thereof include but not limited to: Ziegler-Natta catalysts or chromium-based catalysts.
[0026] The above-mentioned Ziegler-Natta catalysts include titanium series catalysts and vanadium series catalysts, and the titanium series and vanadium...
Embodiment 1
[0062] The polymerization reaction was carried out in a 2L polymerization kettle equipped with mechanical stirring. After the reaction system was evacuated for 30 minutes, at 80° C., ethylene was introduced to normal pressure. Then add 1L of n-hexane, 0.01mol of triethylaluminum, 0.2g of 3-butenylmethyldichlorosilane and 100mg of catalyst 1 into the kettle, feed 0.15g of hydrogen, and then feed ethylene, and keep the ethylene at The reaction was carried out at 0.4MPa, the reaction temperature was controlled at 80°C, and the polymerization reaction time was 30 minutes. After the polymerization was completed, the gas in the reactor was vented, and the polymer was obtained by filtration, and then treated in 100°C water vapor for 30 minutes, and finally at 50 It was vacuum-dried at °C to obtain 252 g of high-density polyethylene.
[0063] The melting temperature, crystallization temperature, crystallinity, melt strength, melt index and gel content of the high-density polyethylene...
Embodiment 2
[0065] The polymerization reaction was carried out in a 2L polymerization kettle equipped with mechanical stirring. After the reaction system was evacuated for 30 minutes, at 80° C., ethylene was introduced to normal pressure. Then add 1L of n-hexane, 0.01mol of triethylaluminum, 0.2g of 5-hexenylmethyldichlorosilane and 100mg of catalyst 1 into the kettle, feed 0.15g of hydrogen, and then feed ethylene, and keep the ethylene at The reaction was carried out at 0.4MPa, the reaction temperature was controlled at 80°C, and the polymerization reaction time was 30 minutes. After the polymerization was completed, the gas in the reactor was vented, and the polymer was obtained by filtration, and then treated in 100°C water vapor for 10 minutes, and finally put in Vacuum drying at 50° C. yielded 245 g of high-density polyethylene.
[0066] The melting temperature, crystallization temperature, crystallinity, melt strength, melt index and gel content of the high-density polyethylene pr...
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