Filtrate reducer copolymer as well as preparation method and application thereof
A technology of fluid loss control agent and copolymer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unsatisfactory comprehensive performance of fluid loss control agent, and improve the effect of fluid loss control and reaction conditions Gentle, easy-to-apply effect
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Embodiment 1
[0099] [Example 1] Preparation of Alkenyl Rigid Monomer
[0100] Add 600 mL of acetone and 25.83 g (0.2 mol) of N-(2-hydroxypropyl) acrylamide into a dry three-necked flask with a stirrer, condenser and dropping funnel, and add 30.6229 g (0.22 mol) of 4 - Methylcyclohexyl isocyanate. Stir until the N-(2-hydroxypropyl)acrylamide in the flask is fully dissolved, then heat in a water bath to 55°C, and vacuumize for 2 hours while heating to remove moisture. Under nitrogen protection, 0.0338 g of dibutyltin dilaurate was added. The 4-methylcyclohexyl isocyanate in the dropping funnel was dropped into the three-necked flask, and the reaction was continued for 5 hours under stirring conditions, and the acetone was removed by distillation under reduced pressure to obtain the crude product of the target molecule. The crude product was rinsed with chloroform three times to remove unreacted monomers, and placed in an oven at 72°C until constant weight to obtain the target product. The...
Embodiment 2
[0111] [Example 2] Preparation of Alkenyl Rigid Monomer
[0112] Add 600mL toluene and 28.6367g (0.2mol) N-(2-hydroxypropyl) methacrylamide to a dry three-necked flask with a stirrer, condenser and dropping funnel, add 30.6229g (0.22mol) to the dropping funnel ) cyclohexyl methyl isocyanate. Stir until the N-(2-hydroxypropyl)acrylamide in the flask is fully dissolved, then heat in a water bath to 65°C, and vacuumize for 2 hours while heating to remove moisture. Under nitrogen protection, 0.0338 g of dibutyltin dilaurate was added. The cyclohexylmethyl isocyanate in the dropping funnel was dropped into the three-necked flask, and the reaction was continued for 6 hours under stirring conditions, and the toluene was removed by distillation under reduced pressure to obtain the crude product of the target molecule. The crude product was rinsed with chloroform three times to remove unreacted monomers, and placed in an oven at 80° C. to constant weight to obtain the target product....
Embodiment 3
[0115] [Example 3] Preparation of Alkenyl Rigid Monomer
[0116] Add 600mL dimethyl sulfoxide and 25.83g (0.2mol) N-(2-hydroxypropyl) acrylamide to a dry three-necked flask with a stirrer, condenser and dropping funnel, add 33.7087g (0.22 mol) cyclohexyl ethyl isocyanate. Stir until the N-(2-hydroxypropyl)acrylamide in the flask is fully dissolved, then heat in a water bath to 75°C, and vacuumize for 2 hours while heating to remove moisture. Under nitrogen protection, 0.0338 g of dibutyltin dilaurate was added. The cyclohexyl ethyl isocyanate in the dropping funnel was dropped into a three-necked flask, the reaction was continued for 7 hours under stirring, and the dimethyl sulfoxide was removed by distillation under reduced pressure to obtain the crude product of the target molecule. The crude product was rinsed with chloroform three times to remove unreacted monomers, and placed in an oven at 86° C. to constant weight to obtain the target product. The reaction formula is ...
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