Method for preparing high-activity silicon collidal sol formed from superfine silicon dioxide particles

A technology of ultra-fine silica and silica sol, applied in the field of chemistry, can solve the problems of wide particle size distribution and difficult preparation of silica sol, and achieve the effects of uniform size, easy control and mild reaction conditions

Inactive Publication Date: 2007-11-14
LUDONG UNIVERSITY +1
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Problems solved by technology

[0007] The present invention aims to solve the technical problem of preparing silica sol with wide particle size distribution and difficulty in preparing smaller particle size silica sol by the traditional ion exchange method, and discloses a high-activity silica sol composed of ultrafine silica particles that can overcome the above-mentioned defects. The preparation method of silica sol

Method used

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  • Method for preparing high-activity silicon collidal sol formed from superfine silicon dioxide particles
  • Method for preparing high-activity silicon collidal sol formed from superfine silicon dioxide particles
  • Method for preparing high-activity silicon collidal sol formed from superfine silicon dioxide particles

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Embodiment 1

[0029]The water glass of precipitation treatment is diluted to 4.5wt% with deionized water, then joins in the reactor that cationic exchange resin is placed, obtains the concentration after exchange and is the active silicic acid solution of 3.5%, then in the active silicic acid solution Add 5% sodium hydroxide solution, adjust the pH to 9, and heat to 100° C. to obtain a dilute silica sol with a concentration of 3.3% and a particle size of silicon dioxide of 4-6 nanometers. Then, under stirring, continuously and slowly add a solution of active silicic acid with a concentration of 3.5%, add sodium hydroxide solution at any time during this process, adjust the pH value of the reaction solution between 9-10, and react for 1 hour to obtain the particle size Silica sol at 7-11 nm. According to the requirement, permeate and filter through an ultrafiltration membrane to obtain a silica sol with a concentration of 30%.

[0030] The high-resolution transmission electron microscope ob...

Embodiment 2

[0032] The water glass of precipitation treatment is diluted to 5wt% with deionized water, then joins in the reaction still that is placed on cation exchange resin, obtains the active silicic acid solution that concentration is 4%, then adds concentration to 5% active silicic acid solution in active silicic acid solution % sodium hydroxide solution, adjust the pH value to 10, heat to 98 ° C, and react for 2 hours to obtain a dilute silica sol with a concentration of 3.8% and a particle size of silicon dioxide of 6-9 nanometers. According to the requirement, permeate and filter through an ultrafiltration membrane to obtain a silica sol with a concentration of 15%.

[0033] The transmission electron microscope observation results of the silica sol obtained in the examples are shown in FIG. 2 . It can be clearly seen from the structure and morphology that silica sol is composed of spherical particles with a size of about 6-9 nanometers, uniform particle size and narrow size distr...

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Abstract

The invention discloses a kind of preparation method of silica sol of high activity. For this kind of silica sol, the particle is tiny and grain size of it is distributed narrowly. It is characterized in that it takes sodium silicate as raw material, natrium ion is took out using method of exchanging ion and then get active silicic acid solution, prepare silica sol of high activity whose grain size is 6-12 nm, content of silicon dioxide is accounting for 10-30%,content of sodium monoxide is accounting for 0.2-0.3%, and PH value is between 8.5 and 10.5,through controlling proportion, pH value of reaction and heating temperature of active silicic acid solution. Silica sol prepared using this method can satisfy needs of spinning sizing, organic polymerization catalysis and modifying technology. Compared to common ion-exchanging method, preparation method of the invention has advantages of tiny particle, equal granularity, synchronizing dehydration and purification and low energy wasting, and it can control size of particle according to needs of actual utilization.

Description

technical field [0001] The present invention belongs to the compound product class in the field of chemistry. It relates to a preparation process of highly active silica sol composed of ultrafine particles. Especially the preparation method of highly active silica sol applied in the fields of organic reaction catalyst, inorganic / organic nano-hybrid material and textile slurry. Background technique [0002] In many organic materials, in order to improve the strength, heat resistance and other properties of organic materials, silica is often added for modification during the preparation process; the best raw material to add is colloidal silica (silica sol for short). Silica sol is a colloidal solution in which silica is dispersed in water. Because of its large specific surface area, high adsorption, insulation at high temperature, and chemical stability, it is widely used in investment casting, refractory Materials, catalysts, coatings, fibers, fabrics, paper, rubber, adhesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/14
Inventor 高善民黄百勇胡玉才徐彦宾刘军深孔令艳殷平
Owner LUDONG UNIVERSITY
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