Preparation method of transparent LLDPE (linear low density polyethylene) thin-film resin
A film resin and transparent technology, applied in the field of transparent and easy-to-process LLDPE film resin, to achieve the effects of inhibiting formation, refining crystals, and reducing crystallinity
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[0063] Catalyst preparation:
[0064] Using Al 2 o 3 , titanium and F modified porous inorganic carrier SiO 2 Carrier (the carrier can also be replaced by zirconia or thorium oxide), through the step-by-step or co-impregnation method, the vanadium source is impregnated in the porous inorganic carrier SiO 2 on a silica gel carrier to obtain the desired modified catalyst. Immerse about 10-15g of porous silica gel modified by Ti, Al, F, V in basic chromium acetate aqueous solution, wherein the chromium load is 0.1-1wt% of the total weight of the catalyst, after continuous stirring for 3-8 hours , heat up and dry, then roast the silica gel carrier loaded with basic chromium acetate in a fluidized bed at high temperature, remove the physical water of the carrier at the low temperature section, and remove the hydroxyl groups on the silica gel surface at the high temperature section of 500°C-900°C, This high temperature section is maintained for 5-8 hours, and finally under the p...
Embodiment 1
[0068] Add ethylene, 1-butene, hydrogen, oxygen, nitrogen, and modified supported chromium-based catalysts into a single gas-phase fluidized bed reactor. According to the 1-butene / ethylene molar ratio of 0.01:1, the ratio of hydrogen to ethylene The molar ratio is 0.001, the oxygen concentration is 140ppb, and the polymerization reaction is carried out under the process conditions of polymerization temperature of 80°C, polymerization pressure of 1.8MPa, circulation gas velocity of 0.60m / s, catalyst addition of 2g / h, and residence time of 2h .
Embodiment 2
[0070] Add ethylene, 1-butene, hydrogen, oxygen, nitrogen, and modified supported chromium-based catalysts into a single gas-phase fluidized bed reactor. According to the 1-butene / ethylene molar ratio of 0.024:1, the ratio of hydrogen to ethylene The molar ratio is 0.002, the oxygen concentration is 120ppb, and the polymerization reaction is carried out under the process conditions of polymerization temperature of 82°C, polymerization pressure of 1.9MPa, circulation gas velocity of 0.62m / s, catalyst addition of 2g / h, and residence time of 2h. .
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