Silicon dioxide Janus colloidal particles and preparation method and application thereof
A technology of colloidal particles and silica, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as limited application occasions, inability to tightly adsorb on shale surfaces, unfavorable downhole construction, etc.
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specific Embodiment approach 1
[0024] The polymerizable siloxane hydrophobic monomer is a combination of vinyltriethoxysilane and vinyltrimethoxysilane in a weight ratio of 1:(1-2).
specific Embodiment approach 2
[0026] The polymerizable siloxane hydrophobic monomer is a combination of methylvinyldiethoxysilane and methylvinyldimethoxysilane in a weight ratio of 1:(1-2).
[0027] Preferably, in step (1), based on the total weight of the material A, the polymerizable siloxane hydrophobic monomer and the double bond-containing reactive monomer, the polymerizable siloxane hydrophobic The monomers are used in an amount of 1-20% by weight; preferably 10-15% by weight.
[0028] Preferably, in step (1), the double bond-containing reactive monomer is selected from at least one of styrene, methyl methacrylate, methyl acrylate and tert-butyl acrylate.
[0029] Preferably, in step (1), based on the total weight of the material A, the polymerizable siloxane hydrophobic monomer and the double bond-containing reactive monomer, the double bond-containing reactive monomer The amount of body used is 1-10% by weight; preferably 5-10% by weight.
[0030] It should be noted that, preferably, based on th...
Embodiment 1
[0057] Spherical Janus colloidal particles M1 were prepared by interface modification polymerization.
[0058] (1) Stir 1 g of nano-silica into 50 mL of distilled water, and perform ultrasonic treatment at room temperature for 30 minutes to obtain solution A1;
[0059] (2) Add vinyltriethoxysilane, vinyltrimethoxysilane and tert-butyl acrylate to solution A1 under nitrogen protection, stir at 8000rpm for 30 minutes to form emulsion B1, and add vinyltriethyl Oxysilane and vinyltrimethoxysilane account for 5% by weight and 10% by weight of the system respectively, and tert-butyl acrylate added accounts for 5% by weight of the system;
[0060] (3) Add 0.0625g of potassium persulfate to the emulsion B1, and react at 40°C for 4h. After the reaction, stop stirring and cool to room temperature to obtain a white emulsion. After demulsification, filter through absolute ethanol, wash 3 times, and dry in a vacuum oven at 70°C for 24 hours to obtain spherical Janus colloidal particles M1...
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