Preparation method of highly isotactic polypropylene
A polypropylene and high isotactic technology, applied in the field of preparation of isotactic polypropylene, can solve problems such as limiting the application range of polymers and easily corroding metals, and achieve the effects of saving energy, facilitating temperature control operations, and promoting isotactic polymerization
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[0017] The preparation method of metal cerium hybridized POSS complex is:
[0018] Step (1), add 360mL isopropanol, 71.38g phenyltrimethoxysilane, 7.45g deionized water and 9.50g sodium hydroxide successively in a 500mL single-necked round bottom flask equipped with a condensing reflux tube and a magnetic stirrer; Place the flask in an oil bath, stir and reflux at 70°C for 4 hours; then cool to room temperature, and continue to stir for 15 hours; after the reaction is complete, remove the solvent by suction to obtain a white filter cake, and then wash the filter cake with isopropanol Suction filtration 3 times, the filter cake is phenyl cage silsesquioxane tetraol sodium salt;
[0019] Step (2): Add 57.80 g of phenyl cage silsesquioxane tetraol sodium salt, 15.18 g of triethylamine (TEA) and 300 mL of anhydrous THF into a 500 mL four-necked flask, and stir in an ice bath for 0.5 h. Under the protection of nitrogen, inject 21.16g of methyl dichlorosilane, react in ice bath for...
Embodiment 1
[0024] A preparation method of polypropylene particles:
[0025] Step 1. Catalyst loading: According to the molar ratio of metal cerium hybrid poss complex, titanium tetrachloride and anhydrous oxygen-free tetrahydrofuran 1:1:50, add metal cerium hybrid poss complex to anhydrous and oxygen-free Tetrahydrofuran solution, then dropwise add titanium tetrachloride dropwise within 65 minutes. After the dropwise addition, stir and react at 35 degrees Celsius for 4 hours under anhydrous and anaerobic conditions, and then distill the solvent under reduced pressure at 45 degrees Celsius. Methanol was washed 3 times to obtain the poss loaded titanium tetrachloride catalyst for subsequent use;
[0026] Step 2. Polymerization: Firstly, propylene is dehydrated, hydrolyzed, desulfurized by desulfurization tower, dehydrated by molecular sieve, deoxygenated by deoxygenation tower, arsenic removed by arsenic tower and dehydrated by molecular sieve to remove water, oxygen, sulfur and arsenic in...
Embodiment 2
[0030] A preparation method of polypropylene particles:
[0031] Step 1. Catalyst loading: According to the molar ratio of metal cerium hybrid poss complex, titanium tetrachloride and anhydrous oxygen-free tetrahydrofuran 1:1:60, add metal cerium hybrid poss complex to anhydrous and oxygen-free Tetrahydrofuran solution, then add titanium tetrachloride dropwise within 70 minutes. After the dropwise addition, stir and react for 5 hours under anhydrous and anaerobic conditions at 30 degrees Celsius, and then distill the solvent under reduced pressure at 50 degrees Celsius. Methanol was washed 3 times to obtain the poss loaded titanium tetrachloride catalyst for subsequent use;
[0032] Step 2. Polymerization: Firstly, propylene is dehydrated, hydrolyzed, desulfurized by desulfurization tower, dehydrated by molecular sieve, deoxygenated by deoxygenation tower, arsenic removed by arsenic tower and dehydrated by molecular sieve to remove water, oxygen, sulfur and arsenic in raw mate...
PUM
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