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
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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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