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Ammonium stabilized silica sol, its production and use thereof

A manufacturing method and technology of silica sol, applied in the direction of silicon oxide, silicon dioxide, etc., can solve problems such as affecting high temperature resistance performance, and achieve the effect of reducing the content of sodium oxide

Active Publication Date: 2005-07-27
ZHEJIANG YUDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when silica sol is used as a high-temperature binder and to prepare aluminum silicate polycrystalline mullite refractory fibers, the presence of a relatively high content of sodium oxide will generate low-melting substances at high temperatures, which will affect its high-temperature resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] SiO 2 10%, Na 2 O is 0.3%, pH value is 8.5, colloidal particle size is 1000g of alkaline silica sol 8nm, add 300g of 001×7 type cation exchange resin that has been treated with 3% ammonia water and washed, stir, after about 1 hour Filter with a filter cloth, add 300g of the same 001×7 type cation exchange resin to the filtrate, stir, and filter with a filter cloth after about 1 hour to obtain 920g of filtrate. The physical and chemical indicators of the product are: SiO 2 10%, Na 2 O 0.01%, NH 4 + Take NH 3 Calculated as 0.15%, pH value is 8.0, colloidal particle size is 8nm.

Embodiment 2

[0017] SiO 2 20%, Na 2 O is 0.33%, pH value is 9.0, colloidal particle size is 1000g of alkaline silica sol of 8nm, add 200g of 001×7 type cation exchange resin that has been treated with 4% ammonia water and washed, stir, after about 1 hour Filtrate with a filter cloth to obtain 950g of filtrate, the physical and chemical indicators of which are: SiO 2 20%, Na 2 O 0.2%, NH 4 + Take NH 3 Calculated as 0.05%, pH value is 8.5, colloidal particle size is 10nm.

Embodiment 3

[0019] Take 1000 g of 001×7 type cation exchange resin treated with 5% ammonia water and washed, and put it into an exchange column. SiO 2 25%, Na 2 O is 0.35%, the pH value is 9.5, and 500 g of alkaline silica sol with a colloidal particle size of 13 nm is passed through an ion exchange column. From the outlet of the exchange column, 950g of ammonium-stabilized silica sol can be obtained, and the physical and chemical indicators of the product are: SiO 2 25%, Na 2 O is 0.08%, NH 4 + Take NH 3 Calculated as 0.1%, pH value is 9.0, colloidal particle size is 13nm.

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Abstract

An ammonium stabilized silica sol consists of silica 10-36%, sodium oxide 0.01-0.2% and ammonia 0.05-0.5%, with the pH value of 8.0-10.0. The silica with colloidal particle exists in water, the average particle size is 8-20 nanometer, sodium oxide with Na+ exists in silica sol solution, the ammonia with NH3.H2O and NH4 stable state exist in silica sol solution. Production is carried out by taking basic sodium silica sol as material, ionic exchange reacting by cation exchange resin with ammonia water of ammonium bicarbonate pretreated, and obtaining ammonium stabilized silica sol. It is prepared for polycrystal mullite fire-proof fiber. It achieves higher temperature resistant performance.

Description

technical field [0001] The present invention relates to a silica sol and its production method and application, especially an ammonium-stabilized silica sol and its production method and application. Background technique [0002] Silica sol is a colloidal solution of silica in water, and its colloidal particle size is 1-100nm. The most widely used in industry is silica sol with a particle size of 8-20nm. Silica sol can be widely used in architectural coatings, precision casting, catalyst carriers, refractory materials and other industries. The main methods for preparing silica sol include ion exchange method, elemental silicon dissolution method and electrodialysis method. [0003] At present, the main varieties of silica sol in China are alkaline sodium silica sol and acid silica sol. For example, the "Inorganic Salt Industry Handbook" published by Chemical Industry Press in January 1996, page 40, quoted the industry standard of the Ministry of Chemical Industry, and intr...

Claims

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Application Information

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IPC IPC(8): C01B33/14C04B35/185
Inventor 章浩龙
Owner ZHEJIANG YUDA CHEM IND
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