Method for preparing modified nanosilicon dioxide

A nano-silica, modification technology, applied in the field of nano-materials, can solve the problems of poor dispersion of nano-silica, unfavorable industrialization, environmental pollution, etc., and achieve the effect of good dispersion, not easy to agglomerate, and enhance hydrophobicity

Active Publication Date: 2015-08-26
杭州爱净科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is easy to operate, but the cost is high, it is easy to cause environmental pollution, and it is not conducive to industrialization
The preparation of nanomaterials by the microemulsion method has the characteristics of easy operation. However, the microemulsion method is easily affected by factors such as test conditions in the process of preparing nano-silica, and the dispersion of the obtained nano-silica is poor.

Method used

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  • Method for preparing modified nanosilicon dioxide

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preparation example Construction

[0020] The embodiment of the present invention discloses a preparation method of modified nano silicon dioxide, comprising the following steps: step a) mixing cyclohexane, phenylethylphenol polyoxypropylene polyoxyethylene ether, n-hexanol and polyglycerol oleate , obtain a microemulsion system after stirring; step b) add deionized water, 1-2 mass parts of chitosan and 2-6 mass parts of ethyl orthosilicate to the microemulsion system in turn, stir, drop by drop Ammonia, add disodium edetate, add acetone after stirring, then add 1,2 propylene glycol and deionized water for washing to obtain nano silicon dioxide; step c) 2-8 parts by mass of the nano silicon dioxide obtained in step b Silicon oxide is added to the mixed solution of deionized water and ethanol, after stirring, 5-8 mass parts of polyethylene glycol are added, and the stirring is continued, and 1-2 mass parts of methacrylic acid oxypropylmethyldimethoxy Silane, to obtain a mixed solution after the reaction; step d)...

Embodiment 1

[0050] The invention provides a kind of preparation method of nano silicon dioxide, comprises the following steps:

[0051] 1. Mix 120 mass parts of cyclohexane, 20 mass parts of phenylethylphenol polyoxypropylene polyoxyethylene ether, 20 mass parts of n-hexanol, and 12 mass parts of polyglycerol oleate, stir for 15 minutes, It is a microemulsion system.

[0052] 2. Add 5 parts by mass of deionized water and stir for 10 minutes.

[0053] 3. Add 1 mass part of chitosan and 56 mass parts of tetraethyl orthosilicate, and stir for 10 minutes.

[0054] 4. Add 3 parts by mass of ammonia water dropwise, add 1 part by mass of disodium edetate and stir at room temperature for 1-2 hours.

[0055] 5. Add 80 parts by mass of acetone to break the emulsion to precipitate the nanospheres, and add 5 parts by mass of 1,2 propylene glycol for ultrasonic treatment. Then add a certain amount of deionized water and ethanol to repeatedly centrifuge and wash several times.

[0056] 6. The above...

Embodiment 2

[0062] 1. Mix 100 mass parts of cyclohexane, 12 mass parts of phenylethylphenol polyoxypropylene polyoxyethylene ether, 25 mass parts of n-hexanol, and 10 mass parts of polyglycerol oleate, stir for 15 minutes, It is a microemulsion system.

[0063] 2. Add 3 parts by mass of deionized water and stir for 18 minutes.

[0064] 3. Add 1 mass part of chitosan and 6 mass parts of tetraethyl orthosilicate, and stir for 6 minutes.

[0065] 4. Add 2 parts by mass of ammonia water dropwise, add 1 part by mass of disodium edetate and stir at room temperature for 1 hour.

[0066] 5. Add 60 parts by mass of acetone to break the emulsion to precipitate the nanospheres, and add 10 parts by mass of 1,2 propylene glycol for ultrasonic treatment. Then add a certain amount of deionized water and ethanol to repeatedly centrifuge and wash several times.

[0067] 6. Add 2-8 parts by mass of the above-mentioned nano silicon dioxide to the mixed solution of 100 parts by mass of deionized water and...

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Abstract

The invention provides a method for preparing modified nanosilicon dioxide. Firstly, nanosilicon dioxide is reunited as little as possible by adding chitosan during the nucleation process, thereby obtaining modified nanosilicon dioxide which is uniform, steady and excellent in dispersivity. Secondly, ethylene diamine tetraacetic acid and the nanosilicon dioxide react to enable the surface of the ethylene diamine tetraacetic acid to modify a certain amount of amino. Thirdly, silanol and aminosilylation are arranged on the outer layer of the nanosilicon dioxide, added stannous chloride enables the silanol and the aminosilylation to have excellent activities to epoxy groups, speeds up reaction progress, and greatly improves modified grafting ratio of surface of the nanosilicon dioxide.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a preparation method of modified nano silicon dioxide. Background technique [0002] Nano-silica is amorphous white powder, non-toxic, tasteless, and non-polluting. It is a non-metallic material with hydroxyl groups and adsorbed water on its surface. The molecules of nano-silica have a three-dimensional chain structure, which has the characteristics of small particle size, low density and large specific surface area, and has excellent stability, thickening, extinction, anti-sticking, reinforcing, thixotropy Excellent optical and mechanical properties, widely used in ceramics, rubber, plastics, electronic packaging materials, antibacterial materials, coatings, pigments and catalyst carriers and other fields. Since the properties of the material are closely related to the particle size and shape of the material, many properties can only be manifested macroscopically wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B82Y40/00
Inventor 石峰张寒洁
Owner 杭州爱净科技有限公司
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