Preparation method for transparent random polypropylene copolymer composition
A polypropylene composition and random copolymerization technology are applied in the field of preparation of transparent random copolymerized polypropylene compositions, which can solve the problems of low rigidity, poor transparency, low toughness and the like, and achieve high modulus, good transparency and toughness. , prepare a simple effect
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Embodiment 1
[0044] Preparation of polypropylene:
[0045] The polymerization reaction is carried out in a 10L autoclave (bulk polymerization): inject 2L of liquid propylene into the autoclave that has been purged with hot nitrogen more than 3 times, add 6ml of co-catalyst triethylaluminum, start stirring, and then inject 2L of liquid propylene ; Add 11mg of HA catalyst, 30g of hydrogen and 500g of ethylene, and finally inject 1L of liquid propylene, flush all the catalyst into the reactor, and close the feeding valve. Raise the high-pressure polymerization reactor to 70°C within 15-20 minutes and count the time. After reacting for 1 hour, add 20ml of butene-1 and continue the reaction for 1 hour. The residual gas is discharged and the material is discharged to obtain a white homopolypropylene. Powder. After the polypropylene powder is fully dried, the total weight of the polymer is weighed at 1,110 grams, and the catalytic efficiency of the catalyst is calculated to be 98,000 times.
[0046]...
Embodiment 2
[0049] Preparation of polypropylene:
[0050] The polymerization reaction is carried out in a 10L autoclave (bulk polymerization): 2L of liquid propylene is injected into the autoclave that has been purged with hot nitrogen more than 3 times, 6ml of the cocatalyst triethylaluminum and 1ml of external electron donor D-donor are added. , Start stirring, and then inject 2L of liquid propylene; add 60mg of ND catalyst, 410g of hydrogen and 300g of ethylene, and finally inject 1L of liquid propylene, flush all the catalyst into the reactor, and close the feeding valve. Raise the high-pressure polymerization reactor to 70°C within 15-20 minutes and count the time. After reacting for 1 hour, add 200ml of butene-1. After the polymerization is continued for 1 hour, the residual gas is discharged and the material is discharged to obtain a white random copolymer Powder. After the random copolymer powder is fully dried, the total weight of the polymer is weighed to 1,200 grams, and the cata...
Embodiment 3
[0054] Preparation of polypropylene:
[0055] The polymerization reaction is carried out in a 10L autoclave (bulk polymerization): inject 2L of liquid propylene into the autoclave that has been purged with hot nitrogen more than 3 times, add 6ml of co-catalyst triethylaluminum, start stirring, and then inject 2L of liquid propylene ; Add 8mg of HA catalyst, 150g of hydrogen and 15g of ethylene, and finally inject 1L of liquid propylene, wash all the catalyst into the reactor, and close the feeding valve. Raise the high-pressure polymerization reactor to 70℃ within 15-20 minutes and count the time. After 0.5 hours of reaction, 200ml of butene-1 is added. After the reaction is continued for 1 hour, the residual gas is discharged and the material is discharged to obtain white polypropylene powder. . After the polypropylene powder is fully dried, the total weight of the polymer is weighed to 980 grams, and the catalytic efficiency of the catalyst is calculated to be 122,000 times.
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