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Method for reducing viscosity of silica sol with high solid content

A technology with high solid content and silica sol, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., and can solve problems such as reducing viscosity

Active Publication Date: 2022-02-11
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the experiment, it was found that adding alkali metal salts such as sodium chloride and potassium chloride to the high-viscosity silica sol (to make the metal mass fraction reach 500-1000ppm) can significantly reduce the viscosity, but such silica sol is not suitable for IC manufacturing and some Applications sensitive to metal ions such as infrared device polishing

Method used

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  • Method for reducing viscosity of silica sol with high solid content

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Embodiment 1

[0022] Prepare 1 kg of high-purity silica sol (containing SiO 2 7.5%, pH 9.7), 5 g of sodium fluoride powder was added thereto, and then heated to 60° C. and kept for 10 minutes. After the solution was cooled, it passed through a cation exchange column and an anion exchange column successively, and the obtained semi-product was concentrated by ultrafiltration to a specific gravity of 1.315 to obtain a finished product. The characterization results are shown in Table 1.

Embodiment 2

[0024] Prepare 10kg of high-purity silica sol (containing SiO 2 19.0%, pH 8.0), 50 g of tetra-n-butylammonium fluoride (TBAF) crystals were added thereto, and then heated to 30° C. and kept for 60 minutes. After the solution was cooled, it passed through a cation exchange column and an anion exchange column successively, and the obtained semi-product was concentrated by ultrafiltration to a specific gravity of 1.374 to obtain a finished product. The characterization results are shown in Table 1.

Embodiment 3

[0026] Prepare 3kg of high-purity silica sol (containing SiO 2 19.0%, pH 9.0), 15 g of ammonium fluoride powder was added thereto, and then heated to 40° C. and kept for 30 minutes. After the solution was cooled, it passed through a cation exchange column and an anion exchange column successively, and the obtained semi-finished product was concentrated by ultrafiltration to a specific gravity of 1.265 to obtain a finished product. The characterization results are shown in Table 1.

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Abstract

The invention discloses a method for reducing the viscosity of silica sol with high solid content, and relates to the technical field of silica sol preparation. The method is suitable for silica sol prepared by an ion exchange method, and the silica sol is treated by using fluoride, so that part of hydroxyl groups are converted into fluorine substituent groups, the hydrogen-bond interaction among particles is reduced, and a silicic acid polymer in the silica sol is depolymerized. Then the silica sol is treated by using cation exchange resin and anion exchange resin in sequence, and unreacted fluorine ions and cations introduced when fluoride is added are removed. Unreacted silicic acid polymers in the silica sol can be removed at the same time in the anion exchange step, so that the viscosity is further reduced.

Description

technical field [0001] The invention relates to a method for reducing the viscosity of silica sol with high solid content, and relates to the technical field of silica sol preparation. Background technique [0002] At present, the techniques for preparing silica sol abrasives mainly include orthosilicate hydrolysis, ion exchange and silica powder. The ion exchange method has cheap raw materials, simple equipment and process, easy operation, and controllable product technical parameters, so it is widely used. The method uses water glass as a raw material, obtains silicic acid through an ion exchange process, and the latter nucleates and grows under alkaline conditions to obtain silica sol. However, the silica sol prepared by this method often contains a small amount of unreacted silicic acid. When the concentration of the glue solution is low, it usually does not cause obvious effects. Once the glue solution is concentrated, these silicic acids will polymerize to a certain e...

Claims

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Application Information

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IPC IPC(8): C01B33/146C01B33/148C09K3/14
CPCC01B33/146C01B33/148C09K3/14C01P2006/80
Inventor 李洪深高逸飞吕毅张剑
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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