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A preparation method of highly active silica sol composed of ultrafine silica 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 effect of uniform size, easy control and reduction of equipment cost.

Inactive Publication Date: 2011-12-14
LUDONG UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A preparation method of highly active silica sol composed of ultrafine silica particles
  • A preparation method of highly active silica sol composed of ultrafine silica particles
  • A preparation method of highly active silica sol composed of ultrafine silica particles

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Experimental program
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Effect test

Embodiment 1

[0028] 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%.

[0029] The high-resolution transmission electron microscope o...

Embodiment 2

[0031] The water glass of precipitation treatment is diluted to 5wt% with deionized water, then joins in the reaction kettle 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%.

[0032] The transmission electron microscope observation result of gained silica sol in the embodiment is as follows figure 2 shown. 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...

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Abstract

The invention discloses a preparation method of highly active silica sol with fine particles and narrow particle size distribution. It is characterized in that sodium silicate solution is used as raw material, and an active silicic acid solution is obtained after removing sodium ions by an improved ion exchange method. By controlling the proportion of active silicic acid solution, reaction pH value and heating temperature, the ultrafine The silica sol composed of silicon particles is finally prepared by the ultrafiltration membrane infiltration method to obtain colloidal particles with a particle size of 6-12 nanometers, a silicon dioxide content of 10-30%, a sodium oxide content of 0.2-0.3%, and a pH value of 8.5 -10.5 highly active silica sol. The silica sol prepared by the method can meet the technical requirements of textile sizing, organic polymerization reaction catalysis, modification and the like. Compared with the general ion exchange method, the preparation method of the present invention has the advantages of small particles, uniform particle size distribution, simultaneous dehydration and purification, and low energy consumption, and can flexibly control the particle size according to actual application requirements.

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 Patents(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