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Process for preparing amphiphilic nano silicon dioxide

A nano and amphiphilic block technology, which is applied in the field of preparation of amphiphilic nano SiO2, can solve the problems of high production cost and achieve the effects of low cost, reduced agglomeration and mild reaction conditions

Inactive Publication Date: 2007-04-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-silica products prepared by the above methods have hydrophobic or hydrophilic properties, and the production cost is relatively high, while the preparation methods of amphiphilic nano-silica are rare

Method used

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  • Process for preparing amphiphilic nano silicon dioxide
  • Process for preparing amphiphilic nano silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: After filtering out impurities with sodium silicate (water glass) with a modulus of 3.4 and a content of 3%, in the presence of amphiphilic block polyether silanol compounds, wherein the amphiphilic block polyether silanol The dosage of the compound is 0.5% of sodium silicate, the x value of the block polyether silanol is 12, and the y value is 10. Perform ion exchange through polystyrene cation exchange resin until the pH value of the liquid reaches 2, then perform ion exchange through polystyrene anion exchange resin until the pH value of the body reaches 4, add NaOH solution, adjust the pH value to 8.5, and let it stand for 12 After 1 hour, heat at 60°C for 6 hours, cool to room temperature, and concentrate to a solid content of 20% by ultrafiltration through an ultrafiltration membrane with a molecular weight of 50,000 to obtain an amphiphilic nano-SiO with an average particle size of 50nm. 2 Dispersion liquid, which is stable under acidic and alkaline co...

Embodiment 2

[0025] Example 2: After filtering out impurities with sodium silicate (water glass) with a modulus of 3.4 and a content of 10%, in the presence of amphiphilic block polyether silanol compounds, wherein the amphiphilic block polyether silanol The dosage of the compound is 5% of the sodium silicate, the x value of the block polyether silanol is 120, and the y value is 100. Perform ion exchange through polystyrene cation exchange resin until the pH value of the liquid reaches 3, then perform ion exchange through polystyrene anion exchange resin until the pH value of the body reaches 6, add NaOH solution, adjust the pH value to 10.5, and let it stand for 24 After 1 hour, heat at 80°C for 2 hours, cool to room temperature, and concentrate to a solid content of 35% by ultrafiltration through an ultrafiltration membrane with a molecular weight of 40,000 to obtain an amphiphilic nano-SiO with an average particle size of 30nm. 2 Dispersion liquid, which is stable under acidic and alkal...

Embodiment 3

[0026] Example 3: After filtering out impurities with sodium silicate (water glass) with a modulus of 3.4 and a content of 5%, in the presence of amphiphilic block polyether silanol compounds, wherein the amphiphilic block polyether silanol The dosage of the compound is 2% of the sodium silicate, the x value of the block polyether silanol is 60, and the y value is 50. Perform ion exchange through polystyrene cation exchange resin until the pH value of the liquid reaches 3, then conduct ion exchange through polystyrene anion exchange resin until the pH value of the body reaches 5, add NaOH solution, adjust the pH value to the range of 9, and statically After standing for 24 hours, heat at 80°C for 2 hours, cool to room temperature, and concentrate through an ultrafiltration membrane with a molecular weight of 20,000 to a solid content of 30% to obtain amphiphilic nano-SiO with an average particle size of 10nm. 2 Dispersion liquid, which is stable under acidic and alkaline condi...

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Abstract

A process for preparing the amphiphilic SiO2 nano-particles from sodium silicate includes such steps as removing impurities, cationic exchange with cationic exchange resin of polystyrene under the existence of amphiphilic block polyether silanol compound, anionic exchange with anionic exchange resin of polystyrene, adding NaOH solution, regulating pH value, laying aside, heating, cooling, and ultra-filter for concentrating to obtain the amphiphilic SiO2 nano-particles dispersed in liquid.

Description

technical field [0001] The invention relates to an amphiphilic nano-SiO 2 method of preparation. Background technique [0002] nano-SiO 2 Wide range of applications, involving almost all applications of SiO 2 powder industry. [0003] Nano-SiO 2 There are two kinds of preparation methods: dry method and wet method. Dry methods include gas phase method and arc method, wet method precipitation method and gel method. [0004] The gas phase method mostly uses silicon tetrachloride as the raw material, and uses silicon tetrachloride gas to hydrolyze under high temperature of hydrogen and oxygen flow to obtain smoky silicon dioxide. The method has expensive raw materials, high energy consumption, complex technology and high equipment requirements, which limit the use of products. [0005] The gel method is to add acid to reduce the alkalinity to induce the polymerization reaction of silicate, so that the particle size of the highly polymerized si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/113C01B33/14B82B3/00
Inventor 张超灿吴力立金小刚李曦
Owner WUHAN UNIV OF TECH