Preparation method of ultrapure silica sol and product thereof
A silica sol and colloidal sol technology, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems that the purity requirements of silica sol cannot be met, and the particle size and concentration requirements of silica sol are difficult to meet.
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[0022] The present invention provides a method for preparing a highly stable, ultra-pure silica sol, comprising the following steps:
[0023] S100: Weigh the silicon powder, divide the silicon powder into a first portion of silicon powder and a second portion of silicon powder, mix water and the first portion of silicon powder in proportion, stir and heat to form a silicon powder mixture.
[0024] In one of the embodiments, the first portion of silicon powder accounts for 1 / 10-1 / 3 of the mass of the total silicon powder. The first part of silicon powder is mixed with water to form a mixture, which is mainly to provide a solution environment for the next step. The silicon powder mixture can promote the subsequent positive reaction between silicon powder and water, and improve the conversion rate.
[0025] In one embodiment, in step S100, the mass ratio of the first part of silicon powder to water is 1-2:8-30.
[0026] Optionally, the mass content of silicon in the silicon powd...
Embodiment 1
[0038] The preparation method of the large particle size silica sol of the present embodiment comprises the following steps:
[0039] S100: Weigh the silicon powder with a silicon mass content of 96%, and divide the silicon powder into the first silicon powder and the second silicon powder. The first silicon powder accounts for 1 / 5 of the total silicon powder mass, and the first silicon powder is divided into The silicon powder and water are mixed at a mass ratio of 1:20, stirred and heated to a temperature of 60° C. to form a silicon powder mixture.
[0040] S200: The silicon powder mixture, the second portion of silicon powder and the catalyst are respectively added to the reaction vessel at a certain flow rate, and the catalyst added each time accounts for ≤5% of the total mass of the silicon powder mixture, the second portion of silicon powder and the catalyst. The reaction at a temperature of 100° C. obtains a crude product of silica sol.
[0041] The catalyst is a mixtu...
Embodiment 2
[0044] The preparation method of the large particle size silica sol of the present embodiment comprises the following steps:
[0045] S100: Weigh the silicon powder with a silicon mass content of more than 95%, and divide the silicon powder into the first silicon powder and the second silicon powder. The first silicon powder accounts for 1 / 4 of the total silicon powder mass, and the first silicon powder is divided into Silica fume and water are mixed at a mass ratio of 2:25, stirred and heated to a temperature of 60°C to form a silicon fume mixture;
[0046] S200: The silicon powder mixture, the second part of silicon powder and the catalyst triethylenetetramine are respectively added to the reaction vessel at a certain flow rate, and the catalyst added each time accounts for the content of the total mass of the silicon powder mixture, the second part of silicon powder and the organic base. All ≤5%, react under the condition of temperature of 110 ℃, and obtain the crude produc...
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