Modified hyperbranched polyester grafted carbon microspheres as well as preparation method and application thereof
A technology of hyperbranched polyester and carbon microspheres, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of mismatched size of formation micro-cracks, insufficient high temperature resistance, poor sealing effect, etc. The effect of maintaining wellbore stability, low cost, and optimizing rheological properties
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[0021] The first aspect of the present invention provides a kind of preparation method of modified hyperbranched polyester grafted carbon microspheres, it is characterized in that, the method comprises:
[0022] (1) In the presence of the first catalyst, the aminated carbon microspheres and AB containing both hydroxyl and carboxyl 2 Type monomer carries out the first reaction in the first solvent, obtains the first product;
[0023] (2) In the presence of the second catalyst, the first product is reacted with the fatty acid containing long alkyl chain in the second solvent, and the product of the second reaction is washed and dried to obtain Modified hyperbranched polyester grafted carbon microspheres.
[0024] In some embodiments of the present invention, the amidated carbon microspheres are prepared by a third reaction between carbon microspheres and an aminosilane coupling agent in a third solvent; wherein, the third solvent can be an aqueous solution of ethanol , prefera...
Embodiment 1
[0060] (1) In a four-necked flask equipped with a thermometer, a stirring rod, a reflux condenser, and a nitrogen conduit, disperse the amidated carbon microspheres AC1 in xylene, pass through nitrogen protection, and then add 2,2-dimethylol Propionic acid was added, and p-toluenesulfonic acid was added, and the first reaction was carried out for 8 hours under the conditions of heating in an oil bath at 150° C. and a stirring rate of 1000 rpm. The obtained product system was subjected to suction filtration, then washed 3 times with absolute ethanol, transferred to a vacuum drying oven and dried at 50°C for 8 hours to obtain the first product; wherein, xylene:aminated carbon microspheres AC1:2, The weight ratio of 2-dimethylolpropionic acid: p-toluenesulfonic acid is 100:6:18:0.15;
[0061] (2) In a four-necked flask equipped with a thermometer, a stirring rod, a reflux condenser and a nitrogen conduit, the first product and lauric acid are dispersed in xylene, then p-toluenesu...
Embodiment 2
[0064] (1) In a four-necked flask equipped with a thermometer, a stirring rod, a reflux condenser, and a nitrogen gas conduit, disperse the amidated carbon microspheres AC2 in xylene, pass through nitrogen protection, and then add 2,2-dimethylol Propionic acid was added, and p-toluenesulfonic acid was added, and the first reaction was carried out for 8 hours under the conditions of heating in an oil bath at 140° C. and a stirring rate of 1200 rpm. The obtained product system was subjected to suction filtration, then washed 3 times with absolute ethanol, transferred to a vacuum drying oven and dried at 50°C for 8 hours to obtain the first product; wherein, xylene:aminated carbon microspheres AC2:2, The weight ratio of 2-dimethylolpropionic acid: p-toluenesulfonic acid is 100:8:25:0.2;
[0065] (2) In a four-necked flask equipped with a thermometer, a stirring rod, a reflux condenser and a nitrogen conduit, the first product and stearic acid are dispersed in xylene, then p-tolue...
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