Ethanol solution of silicon dioxide, its manufacturing method and sue

A technology of silicon dioxide and ethanol solution, which is applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems affecting the performance of mold shells and casting quality, short life of coatings, cumbersome processes, etc., to achieve easy quality control, The effect of low production cost and simple production process

Inactive Publication Date: 2006-06-14
章浩龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When it is used as a precision casting binder, foundry companies can only obtain it on-site by hydrolysis of ethyl silicate, and special equipment is required. Poor performance, the prepa

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0017] Example 1: An ethanol solution of silicon dioxide, containing 87.5% ethanol, 7.5% water, and 5% silicon dioxide. The average particle size of silica colloidal particles is 5nm.

Example Embodiment

[0018] Example 2: An ethanol solution of silica, containing 85% ethanol and 15% silica. The average particle size of silica colloidal particles is 8nm.

Example Embodiment

[0019] Example 3: An ethanol solution of silicon dioxide, containing 62% ethanol, 10% water, and 28% silicon dioxide. The average particle size of silica colloidal particles is 11 nm.

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Abstract

The present invention discloses a silicon dioxide ethyl alcohol solution, its preparation method and application. It contains silicon dioxide and ethyl alcohol, the silicon dioxide is existed in the ethyl alcohol in the form of colloid granules. The weight content of silicon dioxide is 5-35%, optimum weight content is 15-28%, and the average grain size of colloid granules is 5-20 nano. Its preparation method includes the following steps: adding ethyl alcohol into silica sol to obtain solution, heating and evaporating, condensating evaporated water and ethyl alcohol and recovering, and making the water content evaporated in the solution be less than 15% so as to obtain the invented silicon dioxide ethyl alcohol solution which can be used as binder for making shell mould in precision casting.

Description

technical field [0001] The invention relates to a silicon dioxide ethanol solution and its production method and application. Background technique [0002] At present, the most typical silica ethanol solution is ethyl silicate hydrolyzate, which is generally obtained by hydrolyzing ethyl silicate. Ethyl silicate mainly utilizes SiCl 4 React with ethanol to produce: [0003] <chemistry num="001"> <chem file="200410089493_cml001.xml" / > < / chemistry> When used in investment casting as a shell-making binder, ethanol, water and hydrochloric acid are added to ethyl silicate, and -OC in ethyl silicate molecules 2 h 5 Substitution by -OH in water yields silanols: Condensation of silanols to polyethoxysiloxanes Silanol and polyethoxysiloxane are further hydrolyzed to produce orthosilicic acid and polysilicic acid. Hydrolysis of orthosilicic acid can also produce polysilicic acid. When forming polysilicic acid, the Si-O-Si chain can also be in the middle of...

Claims

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Application Information

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IPC IPC(8): C01B33/145
Inventor 章浩龙
Owner 章浩龙
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