Nano-silica graft polymer, preparation method and application thereof, and filtrate reducer
A nano-silica, graft polymer technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as wellbore blockage, filtration reduction effect needs to be improved, increased cost and operational difficulty, etc. The effect of increasing the viscosity of filtrate, reducing the invasion of hydrate formation, and reducing the degree of invasion of filtrate
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[0056] The preparation method of nano silicon dioxide graft polymer of the present invention, adopts chemical formula to be the compound of formula (4) as silane coupling agent, carries out modification reaction to the surface silanol hydroxyl group of nano silicon dioxide, obtains modified Nano silicon dioxide; and then through N-vinyl pyrrolidone and N-vinyl caprolactam under the action of an initiator, the modified nano silicon dioxide is subjected to a graft polymerization reaction to obtain a graft polymer.
[0057]
[0058] Concrete reaction equation is as follows:
[0059] Reaction step one:
[0060]
[0061] Wherein, the structural formula of A is:
[0062]
[0063] Reaction step two:
[0064]
[0065] In the preparation method of the present invention, the principle of preparation and synthesis is that the compound (KH-570) with the chemical formula (4) is used as a silane coupling agent to connect nano silicon dioxide and polymer monomers, thereby formi...
Embodiment 1
[0084] The preparation steps of the nano-silica grafted polymer of the present embodiment are as follows:
[0085] S1), adding 5 g of nano silicon dioxide into 100 ml of ethanol solution and mixing, then ultrasonically dispersing the mixed solution at 15° C. for 30 min, and then stirring for 5 min.
[0086] S2), heating the mixed solution obtained in step S1 to 40°C, adding 20g of compound KH570 to react to obtain a solid product, then taking out the solid product, washing with absolute ethanol for 3 times, and drying at 60°C for 12 hours , to obtain modified nano-silica.
[0087] S3), add 100 g of pure water to 10 g of modified nano-silica obtained in step S2, stir and mix evenly, then add to a three-necked flask equipped with a stirrer and a condensing device, raise the temperature to 50 ° C, and add 25 g of N-vinyl Pyrrolidone and 25g N-vinylcaprolactam, nitrogen gas 30-40min.
[0088] Add 0.3 g of ammonium persulfate as an initiator, stir and react to obtain a nano-silic...
Embodiment 2
[0094] The preparation steps of the nano-silica grafted polymer of the present embodiment are as follows:
[0095] S1), adding 5 g of nano silicon dioxide into 100 ml of ethanol solution and mixing, then ultrasonically dispersing the mixed solution at 15° C. for 30 min, and then stirring for 5 min.
[0096] S2), heating the mixed solution obtained in step S1 to 60°C, adding 20g of compound KH570 to react to obtain a solid product, then taking out the solid product, washing with absolute ethanol for 3 times, and drying at 60°C for 12 hours , to obtain modified nano-silica.
[0097] S3), add 100g of pure water to 10g of modified nano-silica obtained in step S2, stir and mix evenly, then add to a three-necked flask equipped with a stirrer and a condensing device, heat up to 70°C, and add 20g of N-vinyl Pyrrolidone and 30g N-vinyl caprolactam, nitrogen gas 30-40min.
[0098] Add 0.3g ammonium persulfate as initiator, stir reaction, obtain nano silicon dioxide graft polymer;
[...
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