Method for preparing monodisperse large-particle-diameter silica sol through organic-inorganic complex catalysis

A technology of composite catalysis and silica sol, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems of unsatisfactory use requirements, high cost, complicated procedures, etc., to avoid the generation of new particles, good sphericity, and improve the scope of application Effect

Active Publication Date: 2016-02-03
SHANDONG YINFENG NANOMETER NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, the large particle size silica sol produced in China, no matter the water glass method or the silica powder hydrolysis method, there are metal ions (mainly Na introduced by the inorganic catalyst). + , K + ) content is high, which cannot meet the needs of some industries. To reduce the content of metal ions, it is necessary to perform complex post-processing on the product, which is complicated and expensive.

Method used

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  • Method for preparing monodisperse large-particle-diameter silica sol through organic-inorganic complex catalysis
  • Method for preparing monodisperse large-particle-diameter silica sol through organic-inorganic complex catalysis
  • Method for preparing monodisperse large-particle-diameter silica sol through organic-inorganic complex catalysis

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Embodiment 1

[0056] A method for preparing monodisperse large particle size silica sol by organic-inorganic composite catalysis, comprising the following steps:

[0057] (1) Take 1000 grams of deionized water and add it to the reaction kettle equipped with a reflux condenser, so that the liquid level is at 3 / 4 of the reaction kettle, start the agitator, stir at a speed of 500 rpm, and heat the water to 70°C , add catalyst sodium hydroxide 0.8 gram to water, be mixed with the aqueous solution of 0.08wt% sodium hydroxide, be warming up to 80 ℃, add silicon powder 100 grams (purity > 99%, particle size 100~200 mesh) at one time, stir React for 1 hour at a speed of 500 rpm to obtain a uniform silica sol mother solution with an average particle size of 13 nm and a concentration of 1.6 wt%, which serves as the basis for further growth of the particle size.

[0058] (2) Weigh 5 grams of ethanolamine (boiling point 170°C, easily soluble in water, strong alkalinity), add it to 95 grams of deionized...

Embodiment 2

[0063] A method for preparing monodisperse large particle size silica sol by organic-inorganic composite catalysis, comprising the following steps:

[0064] (1) Take 1000 grams of deionized water and add it to the reaction kettle equipped with a reflux condenser, so that the liquid level is at 3 / 4 of the reaction kettle, start the agitator, stir at a speed of 500 rpm, and heat the water to 70°C , add catalyst sodium hydroxide 0.3 gram to water, be mixed with the aqueous solution of 0.03wt% sodium hydroxide, be warmed up to 80 ℃, add silicon powder 100 grams (purity > 99%, particle size 100~200 mesh) at one time, stir React for 1 hour at a speed of 500 rpm to obtain a uniform silica sol mother solution with an average particle size of 14 nm and a concentration of 0.78%, which serves as the basis for further growth of the particle size.

[0065] (2) Weigh 5.5 grams of ethanolamine (boiling point 170° C., easily soluble in water, strong alkalinity), add it into 94.5 grams of deio...

Embodiment 3

[0070] A method for preparing monodisperse large particle size silica sol by organic-inorganic composite catalysis, comprising the following steps:

[0071] (1) Take 1000 grams of deionized water and add it to the reaction kettle equipped with a reflux condenser, so that the liquid level is at 3 / 4 of the reaction kettle, start the agitator, stir at a speed of 500 rpm, and heat the water to 70°C , add catalyst sodium hydroxide 0.1 gram to water, be mixed with the aqueous solution of 0.01wt% sodium hydroxide, be warming up to 75 ℃, add silicon powder 125 grams (purity > 99%, particle size 40~120 orders) at one time, stir React for 1 hour at a speed of 500 rpm to obtain a uniform silica sol mother solution with an average particle size of 18 nm and a concentration of 0.28%, which serves as the basis for further growth of the particle size.

[0072] (2) Weigh 5 grams of 1,1,3,3-tetramethylguanidine (boiling point 160°C, easily soluble in water, strong alkalinity), add it to 95 gra...

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Abstract

The invention relates to a method for preparing monodisperse large-particle-diameter silica sol through organic-inorganic complex catalysis. The method includes the following steps that 1, silica powder is added into an inorganic alkali solution, the mass ratio of the silica powder to water is controlled to be 1:8-15, and a reaction is conducted to obtain a silica sol mother solution with the pH of 9.5-10.5; 2, an organic alkali solution is added into the silica sol mother solution, a reaction is conducted at 70-90 DEG C to increase the particle diameter, and the system pH value in the reaction process is controlled to be 9.5-10.5; 3, after the reaction is finished, unreacted solid impurities in reaction liquid are removed, the product is concentrated to needed concentration, and then the monodisperse large-particle-diameter silica sol is obtained. According to the difference of the relative use quantities and proportions of two kinds of catalysts added in two steps and the difference of the particle diameters, activities and use quantities of the selected silica powder, the monodisperse large-particle-diameter silica sol with the mean particle diameter ranging from 20 nm to 100 nm or so is prepared.

Description

technical field [0001] The invention relates to a method for preparing monodisperse large-diameter silica sol by organic-inorganic composite catalysis, which belongs to the technical field of new materials. Background technique [0002] Silica sol is a colloidal solution formed by the uniform dispersion of amorphous silica aggregate particles in water. It is a nanomaterial with a special structure and its molecular formula is mSiO 2 ·nH 2 O, the colloidal particle size is generally 5 ~ 200nm. Among them, in the industry, the silica sol with a colloidal particle size greater than 20nm is called a large particle size silica sol, which can be prepared into different concentrations according to different usage requirements, usually between 20% and 50%. [0003] Colloidal particles with large particle size and high concentration of silica sol have a large specific surface area, a porous surface structure, strong adsorption capacity, strong stability and bonding performance, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/14
Inventor 谢可彬朱丽杰陈少华郑聪曲玲玲牛怀成刘静
Owner SHANDONG YINFENG NANOMETER NEW MATERIAL CO LTD
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