Nano silicon dioxide preparation method

A technology of nano-silica and alkali metal silicate, which is applied in the direction of silica, silicon oxide, chemical instruments and methods, etc., can solve the problem of high cost, and achieve the effect of low cost, high yield and small dosage

Active Publication Date: 2006-11-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to use a large amount of surfactants and non-polar organic solvents, and the aqueous alkali metal silicate solution contains a large amount of water simultaneously, and this method uses a large amount of surfactants, and the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 900g of water glass (silica weight content is 25%, modulus is 2.8) is heated and boiled to remove part of the water to 750g, slowly add 50g of dewaxed oil, 7g of polyisobutenyl maleate and 13g of T -154 mixture, and mix at this temperature for 20 minutes, under -0.06MPa vacuum condition, remove 150g of water; add 36% hydrochloric acid to the above mixture, keep the pH value of the mixture at 8.5, until the precipitation is no longer Increase to keep it in a solubilized state, mix well; quickly add 36% hydrochloric acid to adjust the pH value to 4, and then mix well to make the reaction complete; wash with distilled water until sodium chloride is less than 0.5wt%, centrifuge, and then wash with ethanol Three times to remove most of the hydrocarbon components and surfactants, and finally dry at 90° C. for 4 hours under the vacuum condition of -0.05 MPa to obtain the nano silicon dioxide of the present invention. The average particle size of nano silicon dioxide is 30nm. ...

Embodiment 2

[0034]Heat and boil 1000g of water glass (silica weight content is 27%, modulus is 2.2) to remove part of the water to 850g, slowly add 40g of four-liner oil and 5g of polyisobutenyl triethanolamine maleate mixture at 75°C , and mixed at this temperature for 10 minutes, under the vacuum condition of -0.02MPa, remove 220g of water; add 95% sulfuric acid to the above mixture, keep the pH value of the mixture at 9, until the precipitation does not increase any more to keep it increasing Add 36% hydrochloric acid quickly to adjust the pH value to 5, then fully mix to make the reaction complete; wash with distilled water until the sulfate ion is less than 0.5wt%, centrifuge, then wash twice with ethanol to remove large Part of the hydrocarbon components and surfactants are finally dried at 100° C. for 3 hours under a vacuum condition of -0.09 MPa to obtain the nano silicon dioxide of the present invention. The average particle size of nano silicon dioxide is 30nm.

Embodiment 3

[0036] Heat and boil 850g of water glass (silica weight content 25%, modulus 2.8) to remove part of the water to 750g, slowly add 30g of Changsanxian dewaxed oil at 75°C, 60g of Sanxian wax paste and 60g of T-154 mixture , and mixed at this temperature for 20 minutes, under the vacuum condition of -0.06MPa, remove 150g of water; add 98% sulfuric acid to the above mixture, keep the pH value of the mixture at 8.5, until the precipitation no longer increases to keep it solubilized state, mix evenly; quickly add 36% hydrochloric acid to adjust the pH value to 4, and then fully mix to make the reaction complete; wash with distilled water until the sodium chloride is less than 0.5wt%, centrifuge, and then wash with ethanol 3 times to remove most of the The hydrocarbon component and the surfactant are finally dried at 90° C. for 4 hours under the vacuum condition of -0.05 MPa to obtain the nano silicon dioxide of the present invention. The average particle size of nano-silica is 28nm...

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PUM

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Abstract

This invention discloses a method for producing nanometer silica dioxide particle. The procedures comprise: add the alkali metal metasilicate into the mixture of hydrocarbons component, surfactant and cosurfactant to form the nanometer super solubilizing colloidal group system of oil-coated high concentration alkali metal metasilicate, which limits the produced nanometer silica dioxide in the nanometer colloidal group for precipitation reaction, and then the invented nanometer silica dioxide can be obtained by washing and drying. By using the characteristic of the highly internal phase dispersed system of oil-coated high concentration alkali metal metasilicate which can in-situ synthesize nanometer particles, the particle diameter of the produced silica dioxide can be 1-100nm, with a narrow range and single distribution state. This invention is characterized of low consumption of surfactant and hydrocarbon component, and low cost.

Description

technical field [0001] The invention relates to a method for preparing ultrafine silicon dioxide, in particular to a method for preparing nanometer silicon dioxide particles. Background technique [0002] Ultrafine silica is a high-quality material for electronic ceramics, transparent toothpaste fillers, catalyst carriers and rubber fillers, especially nano-scale silica. The preparation methods of ultrafine silica include sol-gel method, precipitation method and so on. CN1032641C discloses a method for preparing silicon dioxide by direct precipitation method, wherein water glass is used as silicon source, and inorganic acid is used as precipitating agent. CN 1040200C proposes a method of adding inorganic acid precipitation in stages to prepare silicon dioxide. CN1036990C discloses a method for preparing precipitated silica for rubber additives, the method is as follows: react with an alkali metal silicate and an inorganic acid at a temperature of 60-95° C., and maintain a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01B33/193
Inventor 王鼎聪孙万付
Owner CHINA PETROLEUM & CHEM CORP
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