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Micro-channel preparation method of nano silicon dioxide with uniform particle size

A nano-silicon dioxide and silicon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, nanotechnology for materials and surface science, etc., can solve the problems of difficult particle size and uneven particle size

Active Publication Date: 2015-02-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of non-uniform particle size and difficult control of particle size in the current nano-silica preparation technology, and propose a method for preparing nano-silica with uniform particle size through microchannels. Simple operation, precise control, and easy zoom-in

Method used

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  • Micro-channel preparation method of nano silicon dioxide with uniform particle size
  • Micro-channel preparation method of nano silicon dioxide with uniform particle size
  • Micro-channel preparation method of nano silicon dioxide with uniform particle size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 178ml of tetraethyl orthosilicate to 222ml of ethanol to make solution A, add 110ml of ammonia water and 45ml of water to 245ml of ethanol to make solution B; liquid A and liquid B enter the inlet at a flow rate of 2.055ml / min respectively, and the form is T-shaped , length is 60mm, internal diameter is to carry out reaction in the microchannel reactor of 0.68mm (microchannel reactor adopts laser drilling (inner diameter is 0.5mm), adopts the method for enlarging hole to prepare by wire cutting method then); Then feed liquid into the reactor for aging reaction. The reaction temperature and aging temperature were 80°C. Finally, a silica nanoparticle solution was obtained. The particle size and PDI value of the silica nanoparticles in the solution can be directly measured by a Malvern ZS90 particle size analyzer, and the results are shown in Table 1.

Embodiment 2

[0036] Carry out the same steps as Example 1, change the volume flow rate of liquid to be 1.233ml / min, evaluate in the same way as Example 1, the results are in Table 1.

Embodiment 3

[0038] Carry out the same steps as in Example 1, change the volume flow rate of the liquid to 0.822ml / min, evaluate in the same manner as in Example 1, and the results are shown in Table 1.

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Abstract

The invention discloses a micro-channel preparation method of nano silicon dioxide with a uniform particle size. The method comprises the following steps: injecting an alcoholic solution or water solution of soluble silicate, an alcoholic solution or water solution of an alkali, and inert gas into a micro-channel reactor according to a certain volume ratio, mixing the substances in the micro-channel reactor, and then making the mixture carry out reactions in the reactor so as to obtain a solution containing nano silicon dioxide particles with a controllable, stable and uniform particle size. The provided micro-channel preparation method can obtain nano silicon dioxide particles with a controllable, stable, and uniform size, which is controlled in a range of 1 to 600 nm.

Description

technical field [0001] The invention belongs to the field of preparation of silicon dioxide carrier materials in petroleum, chemical and biological processes, and in particular relates to a method for preparing nanometer silicon dioxide with uniform particle size through a microchannel. Background technique [0002] Nano-silica is an amorphous silica product with a particle size of nanometer (generally 1-100nm), and its appearance is white powder. It is a non-toxic, odorless, and non-polluting non-metallic oxide material. Because of its extremely small particle size, large specific surface area and excellent chemical properties, it exhibits excellent stability, reinforcement, thickening and thixotropy, so it is widely used in rubber, special coatings, textile industries, medicine, ink and other fields. At the same time, due to the characteristics of surface defects and many non-paired atoms, the nano-silica particles are more likely to be physically or chemically combined w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B82Y30/00
Inventor 王树东苏敏苏宏久任高远杜宝磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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