Method for preparing nano-silica

A nano-silicon dioxide and silicon source technology, applied in the directions of silicon dioxide, silicon oxide, nanotechnology, etc., can solve the problems of clogging and cleaning of microchannel reactor channels, and achieve uniform and controllable particle size and production efficiency. High, simple process effect

Active Publication Date: 2020-03-17
中垦农芯(佛山)智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing nanomaterials, microchannel reactors are prone to channel blockage and difficult cleaning.

Method used

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  • Method for preparing nano-silica
  • Method for preparing nano-silica

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Sodium silicate and sodium oleate were dissolved in deionized water to obtain solution A, wherein the mass concentration of sodium silicate was 15%, and the concentration of sodium oleate was 0.1mol / L; sodium oleate and excess ammonium sulfate were dissolved in deionized water In ionized water, take the solution part to obtain solution B with a sodium oleate concentration of 0.1mol / L; turn on the supergravity micro-reaction device, adjust the rotation speed of the micro-reaction plate to 1000rpm, and the rotation speed of the packing layer to 500rpm, wherein the size of the micro-reaction channel is 1 ~2mm; pump solution A and solution B into the supergravity micro-reaction device at a ratio of 1:3, and control the reaction temperature at 35°C; pump the precursor slurry obtained from the reaction into the high-pressure reactor, add After equal mass of deionized water, add a certain amount of polyacrylamide and hydrofluoric acid and stir evenly. The concentration of polya...

Embodiment 2

[0054] Prepare an ethanol solution with a tetraethyl tetrasilicate concentration of 3 mol / L and a hexadecyltrimethylammonium bromide concentration of 0.3 mol / L as solution A; add ammonia water dropwise to the mixture of deionized water and absolute ethanol Add cetyltrimethylammonium bromide and stir to obtain solution B afterward, wherein the concentration of ammoniacal liquor in solution B is 0.5mol / L, and cetyltrimethylammonium bromide concentration is 0.3mol / L, remove The volume ratio of ionized water to ethanol is 2:1; open the supergravity micro-reaction device, adjust the rotation speed of the micro-reaction plate to 1000rpm, and the rotation speed of the packing layer to 500rpm, wherein the size of the micro-reaction channel is 1.5mm; solution A and solution B Pump it into the supergravity micro-reaction device at a ratio of 1:2.5, and control the reaction temperature at 35°C; pump the precursor slurry obtained from the reaction into a high-pressure reactor, add deionize...

Embodiment 3

[0056] Dissolve sodium silicate and sodium dodecylbenzenesulfonate in deionized water to obtain solution A, wherein the mass concentration of sodium silicate is 20%, and the concentration of sodium dodecylbenzenesulfonate is 0.2mol / L; Sodium dodecylbenzenesulfonate concentration is the aqueous solution of 0.2mol / L, then add excess ammonium chloride and stir and take the supernatant to obtain solution B; open the supergravity micro-reaction device, adjust the rotating speed of the micro-reaction plate to 2000rpm, fill The rotation speed of the layer is 1500rpm, and the size of the micro-reaction channel is 0.5-1mm; the solution A and the solution B are pumped into the high-gravity micro-reaction device at a ratio of 1:3.5, and the reaction temperature is controlled at 35°C; The precursor slurry is pumped into the high-pressure reactor, after adding deionized water of equal mass, a certain amount of polyethylene glycol (400-2000) and hydrofluoric acid are added and stirred evenly...

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Abstract

The invention discloses a method for preparing nano-silica. The method comprises the following steps: (1) preparing a solution A containing a silicon source and a solution B containing a precipitator;(2) adding the solution A and the solution B into a supergravity micro-reaction device, and performing a reaction to obtain a precursor slurry; (3) carrying out solvothermal treatment on the precursor slurry; and (4) carrying out solid-liquid separation on the product, and carrying out washing, drying and calcining treatment to obtain the nano-silica material. The method is completed in a supergravity micro-reaction device, the device comprises a micro-reaction disc and a packing layer, and the micro-reaction disc and the packing layer coaxially and reversely rotate, so that the mass transfereffect is greatly enhanced while raw materials are quickly and uniformly mixed, thereby the nucleation size of the product is reduced, the dispersity and uniformity of the nano-material are improved,and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a preparation method of nano silicon dioxide. Background technique [0002] Nano-silica is widely used in catalysis, coatings, rubber, cosmetics, medicine, etc. due to its properties of resisting ultraviolet rays and improving the anti-aging properties of materials. At present, the preparation methods of nano-silica include mechanical crushing method, chemical vapor deposition method, precipitation method, sol-gel method and so on. However, the silicon dioxide powder obtained in the above preparation method has large particles, uneven particle size distribution, and the process is complex and difficult to control. [0003] Micro-reaction technology is a technology for preparing nanomaterials using a miniaturized chemical reaction system with a unit reaction interface scale of micron scale. This technology device has the characteristics of large specific surface area, high transfer rate, short contact time, and few by-products....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B82Y40/00
CPCC01B33/12B82Y40/00C01P2004/64C01P2004/51
Inventor 宋兰兰于跃江秀聪梁慧聂红娇戴志超
Owner 中垦农芯(佛山)智能科技有限公司
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