A kind of polyolefin block copolymer and its preparation method and leather finishing material
A technology of block copolymer and polyolefin block, applied in the direction of coating, etc., can solve the problems of difficulty in manufacturing, affecting the scope of application, and inability to effectively control the performance and structure of polyolefin.
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Embodiment 1
[0070] The polyolefin block copolymer of the present embodiment is prepared according to the following method:
[0071] 1) Use Schlenk technology to vacuumize and fill high-purity nitrogen treatment (reciprocating 3 times) to the single-necked flask equipped with a stirring rotor, then inject quantitative toluene and MMAO (according to Al / Ti=400) into the single-necked flask and Stir well;
[0072] Under stirring conditions, use a vacuum pump to remove the nitrogen in the reaction flask, then quantitatively feed ethylene and propylene gas (monitored by a mass flow meter, the molar ratio of ethylene and propylene is 3 / 5, ethylene is 4.5mmol, propylene is 7.5mmol), and the remaining The negative pressure space is backfilled with nitrogen to the normal pressure environment;
[0073] Add 10 μmol of the toluene solution of the catalyst represented by the aforementioned formula [2] to the system at 10-30°C, react for more than 30 minutes until the monomers in the system are consume...
Embodiment 2
[0081] The polyolefin block copolymer of the present embodiment is prepared according to the following method:
[0082] 1) Use Schlenk technology to vacuumize and fill high-purity nitrogen treatment (reciprocating 3 times) to the single-necked flask equipped with a stirring rotor, then inject quantitative toluene and MMAO (according to Al / Ti=400) into the single-necked flask and Stir well;
[0083] Under stirring conditions, use a vacuum pump to remove the nitrogen in the reaction flask, then quantitatively feed ethylene (monitored by a mass flow meter, ethylene is 10 mmol), and the remaining negative pressure space is backfilled with nitrogen to the normal pressure environment;
[0084] Add 10 μmol of the toluene solution of the catalyst represented by the formula [2] to the system at 0°C, and react for more than 30 minutes until the monomers in the system are consumed and the polyethylene block synthesis is completed;
[0085] 2) Raise the temperature of the system to 25°C,...
Embodiment 3
[0092] The polyolefin block copolymer of the present embodiment is prepared according to the following method:
[0093] 1) Use Schlenk technology to vacuumize and fill high-purity nitrogen treatment (reciprocating 3 times) to the single-necked flask equipped with a stirring rotor, then inject quantitative toluene and MMAO (according to Al / Ti=400) into the single-necked flask and Stir well;
[0094] Under stirring conditions, use a vacuum pump to remove the nitrogen in the reaction flask, then quantitatively feed ethylene (monitored by a mass flow meter, ethylene is 10 mmol), and the remaining negative pressure space is backfilled with nitrogen to the normal pressure environment;
[0095] Add 10 μmol of the toluene solution of the catalyst represented by the aforementioned formula [1] to the system at 0°C, and react for more than 30 minutes until the monomers in the system are consumed and the polyethylene block synthesis is completed;
[0096] 2) Raise the temperature of the ...
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Abstract
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