Modified fiber material and preparation method thereof, and plugging agent for oil-based drilling fluid
A technology of modifying fibers and matrix fibers, applied in the field of oil-based drilling fluids, can solve the problems of low plugging strength, poor lipophilicity, and difficult plugging agents, and achieve better plugging performance, good compatibility, and good affinity. oily effect
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[0036] The present invention provides a preparation method of the aforementioned modified fiber material. The preparation method includes the following steps: S1, mixing acrylic monomers, amide monomers, acrylate monomers, cationic monomers, water and an emulsifier, A pre-emulsion is obtained; S2, matrix fibers, an initiator and a cross-linking agent are sequentially added to the pre-emulsion to carry out an emulsion polymerization reaction to obtain a modified fiber material.
[0037] In the present invention, acrylic monomers, amide monomers, acrylate monomers, cationic monomers and emulsifiers are first mixed to obtain a pre-emulsion, and then fiber materials, an initiator and a cross-linking agent are added to the pre-emulsion in sequence to carry out the emulsion. The polymerization reaction is carried out to obtain a modified fiber material. In this way, adding matrix fibers, initiators and cross-linking agents after the raw materials are mixed evenly and stably, can mak...
Embodiment 1
[0045] 10 g of acrylic acid, 5 g of caprolactam, 5 g of acrylamide, and 3 g of dimethyl diallyl ammonium chloride were added to 180 mL of deionized water and mixed, and 10 mL of 30 wt% sodium hydroxide solution was added to obtain a mixed solution with a pH of 7.0.
[0046] Add 25 g of butyl acrylate, 10 g of dodecyl acrylate, 3 g of N-vinylpyrrolidone, and 12 g of emulsifier MS-12 g to the mixed solution, and emulsify by a shearing emulsifier to obtain a pre-emulsion, wherein the rotating speed of the shearing emulsifier is 3000r / min .
[0047] The pre-emulsion was placed in a three-necked flask to preheat and stir, and when the temperature reached 55 °C, 20 g of polypropylene modified fiber (purchased from Shanghai Bangwei Municipal Engineering Co., Ltd.) was added, and the heating and stirring state was maintained, and the initiator solution (0.1 g potassium persulfate dissolved in 2 mL of deionized water), and the crosslinking agent solution (0.1 g of N,N-methylenebisacryl...
Embodiment 2
[0050] 10 g of methacrylic acid, 5 g of caprolactam, 5 g of acrylamide, and 4 g of 2-(methacryloyloxy)ethyltrimethylammonium chloride were added to 180 mL of deionized water and mixed, and 10 mL of 30wt% sodium hydroxide solution was added to obtain The pH of the mixture is 7.0.
[0051] 22 g of dodecyl acrylate, 10 g of octadecyl acrylate, 5 g of styrene, and 2 g of emulsifier MS-1 were added to the mixed solution, and the pre-emulsion was obtained by emulsification with a shearing emulsifier, wherein the rotating speed of the shearing emulsifier was 3000 r / min.
[0052] The pre-emulsion was placed in a three-necked flask with preheating and stirring. When the temperature reached 55 °C, 20 g of newspaper fiber (purchased from Hebei Danxu Mineral Products Trading Co., Ltd.) was added, and the heating and stirring state was maintained. Potassium sulfate was dissolved in 2 mL of deionized water), and the cross-linking agent solution (0.1 g of N,N-methylenebisacrylamide was disso...
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