Organically modified silica sol and preparation method thereof

A silica and organosilicon technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as non-aqueous systems that cannot be directly applied

Active Publication Date: 2014-08-20
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The silica sol obtained according to the above method is only a dispersion of nanomaterials in water or alcohol-water systems,

Method used

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  • Organically modified silica sol and preparation method thereof
  • Organically modified silica sol and preparation method thereof
  • Organically modified silica sol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Method embodiment 1 of the present invention: it comprises the following steps:

[0028] (1) Dissolve 20ml of tetraethyl orthosilicate in 50ml of N,N-dimethylformamide under stirring conditions at room temperature to prepare mixed solution A.

[0029] (2) Measure 20ml of N,N-dimethylformamide into a three-necked flask under stirring at room temperature, add 2 drops of ammonia water, 1.5ml of deionized water and 0.01g of trisilanol phenyl POSS , to make mixed solution B.

[0030] (3) Add the mixed solution in A dropwise to the mixed solution B at a certain temperature under the condition of stirring. After the dropwise addition, stir for 10-12 hours, transfer the mixed solution to a beaker, and seal it with a parafilm. Prick several small holes on the sealing film, seal and store at room temperature for 1-15 days to obtain POSS modified nano-silica sol.

Embodiment 2

[0032] (1) Dissolve 10ml of tetraethyl orthosilicate and 0.01g of octaaminophenyl POSS in 30ml of isopropanol under stirring at room temperature to make mixed solution A.

[0033] (2) At room temperature and under stirring conditions, measure 10ml of N,N-dimethylformamide in a three-necked flask, add 0.1ml of tetramethylammonium hydroxide and 1ml of deionized water to make a mixed solution b.

[0034] (3) Add the mixed solution in A to the mixed solution B dropwise at a certain temperature and under stirring conditions, stir for 10-12 hours, transfer the mixed solution to a beaker, seal it with a parafilm, and tie it on the parafilm Several small holes are sealed and stored at room temperature for 1-15 days to obtain POSS-modified nano silica sol.

Embodiment 3

[0036] (1) Dissolve 10ml of tetraethyl orthosilicate in 30ml of N,N-dimethylformamide under stirring at room temperature to make mixed solution A.

[0037] (2) Under room temperature and stirring conditions, measure 10ml of N,N-dimethylformamide in a three-necked flask, add 0.77ml of deionized water, 3 drops of acetic acid and 0.05g of carboxyl-terminated hyperbranched polyester , to make mixed solution B.

[0038] (3) Add the mixed solution in A dropwise to the mixed solution B at a certain temperature under the condition of stirring. After the dropwise addition, stir for 10-12 hours, transfer the mixed solution to a beaker, and seal it with a parafilm. Piercing several small holes on the sealing film, sealing and storing at room temperature for 1-15 days to obtain hyperbranched polyester modified nano-silica sol.

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Abstract

The invention relates to an organically modified silica sol and a preparation method thereof. The preparation method comprises the steps: under stirring, adding organic silicon into an organic solvent to obtain a mixed solution A, wherein the molar ratio of organic silicon to the organic solvent is 1:7-12; under stirring, adding a silane coupling agent, POSS or a hyperbranched polymer, deionized water and a catalyst into the organic solvent, to obtain a mixed solution B, wherein the molar ratio of the modification agent (the hyperbranched polymer, the silane coupling agent or POSS), deionized water, the organic solvent and the catalyst is 1-10:45-55:150-170:0.01-1; under stirring, slowly dropwise adding the mixed solution A into the mixed solution B, transferring the mixed solution into a beaker, sealing a mouth with a parafilm, pricking a plurality of small holes on the parafilm, storing at the room temperature for 1-15 days, and thus obtaining the modified organic silicon sol. The organically modified silica sol and the preparation method thereof have the advantages of simple production process and lower manufacturing cost, the used solvent is the organic solvent, and the field of silica sol application is expanded.

Description

technical field [0001] The invention mainly relates to the preparation of silica sol modified by hyperbranched polymer, POSS or silane coupling agent in an organic system. Using this method, the uniform dispersion of nano-silica rigid particles in an organic solvent system can be realized in situ. Background technique [0002] As a new type of material, nanomaterials will become the leading industry in the 21st century. Nano-silica sol is a colloid formed by the uniform diffusion of silica colloidal particles in a solvent. It is one of the most important colloidal materials in the sol-gel process and is widely used. Used in industries such as electronics, biology, rubber, coatings and ceramics. In recent years, nano-dioxide sol has also been applied in the field of medicine, such as toothpaste and drug delivery system. However, due to the small particle size, large specific surface area and high surface energy of nano-silica particles, nano-materials are easy to aggl...

Claims

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Application Information

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IPC IPC(8): C01B33/145
Inventor 付继芳施利毅余文琪贾海森殷金涛陈立亚宗培松董星
Owner SHANGHAI UNIV
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