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Nanometer polysilicon particles and preparation method and application thereof

A microparticle and polysilicon technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient hydrophobicity and inability to widely use nano-polysilicon materials, and achieve strong superhydrophobic performance and small particle size , the effect of a narrow distribution

Active Publication Date: 2010-08-25
河南海博瑞硅材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As reported in Russia, the use of γ-ray-activated additives to chemically modify nano-silicon dioxide produces nano-polysilicon with a wide particle size distribution of 5-100nm, but its existence is difficult when the permeability is very low. Defects in low-permeability oil fields; in Chinese patent ZL200410010121.0, Li Zhiwei et al. prepared polymer-coated nano-polysilicon particles, and the contact angle of water on the surface of the nanoparticles can reach more than 95°, but the disadvantage is that the hydrophobicity is insufficient
Therefore, nano-polysilicon materials cannot be widely used at present.

Method used

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  • Nanometer polysilicon particles and preparation method and application thereof
  • Nanometer polysilicon particles and preparation method and application thereof
  • Nanometer polysilicon particles and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Add 100ml of ethanol and 40mmol of ethyl orthosilicate into the reaction flask, raise the temperature to 60°C, add 5mmol of propylacryloyloxytrimethoxysilane, 1mmol of lactic acid solution, reflux at a constant temperature of 60°C for 2 hours, and then add ammonium bicarbonate dropwise The aqueous solution was added to make the pH value reach 9-10. After 1 hour of reaction, 10 mmol of diethoxydimethylsilane was added, and the reaction was continued at a constant temperature of 60° C. for 3 hours. Spray drying, the outlet temperature is 110°C, and the obtained white powder is nano-polysilicon particles. The transmission electron micrograph of gained nano polysilicon particle sees figure 1 , the particle size is 10-20nm.

Embodiment 2

[0027] Add 40mmol of butyl orthosilicate to the mixed solution of 30ml of xylene and 30ml of water at a constant temperature of 60°C, then add 10mmol of hexamethyldisilazane and 0.5mmol of adipic acid, react at a constant temperature of 60°C for 2 hours, then drop Add ammonia water, adjust the pH value to about 10, and react for 5 hours. After spray drying, the outlet temperature is 110° C. to obtain nano-polysilicon particles with a particle size of 40-60 nm. The dispersion state of gained nano polysilicon particles in solvent diesel oil, carbon tetrachloride and water sees figure 2 , it can be seen that the lipophilic and hydrophobic properties of the particles are very good.

Embodiment 3

[0029] 40mmol Na 2 SiO 3 ·5H 2 O was added to a mixed solution of 100ml of methanol and water at a constant temperature of 60°C, and a mixed solution containing 10mmol of chlorotrimethylsilane, 1mmol of perfluorooctanoic acid and 1mol of γ-glycidyl etheroxypropyltrimethoxysilane was added dropwise, and the reaction was constant temperature 2 Hour. Filter and wash to remove sodium ions and chloride ions, add the filter cake to ethanol solution, add ammonia water to adjust the pH to about 9, add 1 mmol alanine, and react at 80°C for 1 hour. The solvent is distilled off to obtain nano polysilicon particles with a particle diameter of 20-25nm. The photo of water on the film formed by the obtained nano-polysilicon particles is shown in image 3 , It can be seen that the contact angle is greater than 170°, and the hydrophobicity is very good.

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Abstract

The invention relates to nanometer polysilicon particles and a preparation method thereof. The particles use silicon dioxide as nuclei; the surfaces of the particles are bonded with modifying agents of organic compounds which contain hydrophobic groups and adsorption assisting groups; the particle diameter is between 5 and 60 nm; and the organic compounds which contain the hydrophobic groups and the adsorption assisting groups accounts for 5 to 35 weight percent and 1 to 10 weight percent of the nanometer polysilicon particles respectively. The nanometer polysilicon particles have good dispersibility in an organic medium, super-hydrophobic performance and strong adsorption on sandstone and is applicable to depressurization and stimulation of a water injection well of a low or superlow-permeability oilfield.

Description

(1) Technical field [0001] The invention relates to a nano polysilicon particle, a preparation method and application thereof. (2) Background technology [0002] Water flooding is the main production method for low permeability oilfields. However, low-permeability oil reservoir formations have weak pressure conduction capacity, and low-permeability oil wells have problems such as high water injection pressure, small water injection volume, and unbalanced injection and production, resulting in large seepage resistance and rapid rise in water injection pressure, resulting in a rapid decrease in water injection volume. Production declines rapidly. [0003] At present, acidizing is a relatively effective treatment method for increasing injection of water injection wells commonly used in oilfields. However, when it is used in oil fields with very low permeability, there are problems such as poor construction effect, short validity period, and high construction cost. [0004] N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58
Inventor 张治军李小红曹智李庆华
Owner 河南海博瑞硅材料科技有限公司
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