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High-stability silicon dioxide sol and preparation method thereof

A technology of silica and high stability, applied in the direction of coating, etc., can solve the problems of easy aggregation of polymer emulsion, poor stability, and inability to store for a long time, and achieve the effect of good durability, high stability, and uniform size

Pending Publication Date: 2022-08-09
YANGZHOU POLYTECHNIC INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used as a hydrophobic material, there are still problems such as poor stability, inability to store for a long time, and easy agglomeration in polymer emulsions.

Method used

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  • High-stability silicon dioxide sol and preparation method thereof
  • High-stability silicon dioxide sol and preparation method thereof
  • High-stability silicon dioxide sol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Add perfluoron-octyl propylene oxide to the reaction flask with epoxy resin E-03 Under the catalysis of CTAB, the ring-opening reaction is carried out to obtain a fluorine-containing epoxy resin; then the amino-terminated polyether is added. (Molecular weight is 600), add ethanol as solvent, heat to 60°C, stir for 3h, and then remove the solvent to obtain a modifier with hydrophilic main chain and hydrophobic side chain.

[0025] 2) Dissolve 0.25g of modifier in 60ml of absolute ethanol, add 5ml of ammonia water, stir and mix at room temperature to obtain solution A; add 1.9ml of ethyl orthosilicate to 5ml of absolute ethanol, stir and mix at room temperature The solution B was uniformly obtained; the solution B was added dropwise to the continuously stirred solution A, after the dropwise addition was completed, sealed and stirred for 4 hours, left to stand overnight, and then a certain amount of absolute ethanol and water were added to adjust its solid content...

Embodiment 2

[0028] Dissolve 0.25g of modifier in 60ml of absolute ethanol, add 5ml of ammonia water, stir and mix at room temperature to obtain solution A; add 2.2ml of ethyl orthosilicate to 5ml of absolute ethanol, stir and mix at room temperature to obtain solution A Solution B; add solution B dropwise to solution A which is continuously stirred, after the dropwise addition is completed, seal and stir for 4 hours, let stand overnight, and then add a certain amount of absolute ethanol and water to adjust its solid content to 1-2wt% .

[0029] Dissolve 1.1 ml of KH550 in 5 ml of absolute ethanol, add dropwise to the system in step 2), seal and stir for 4 hours, and let stand overnight to obtain a high-stable silica sol.

Embodiment 3

[0031] Dissolve 0.25g of modifier in 60ml of absolute ethanol, add 5ml of ammonia water, stir and mix at room temperature to obtain solution A; add 2.6ml of ethyl orthosilicate to 5ml of absolute ethanol, stir and mix at room temperature to obtain solution A Solution B; add solution B dropwise to solution A which is continuously stirred, after the dropwise addition is completed, seal and stir for 4 hours, let stand overnight, and then add a certain amount of absolute ethanol and water to adjust its solid content to 1-2wt% .

[0032] 1.5ml of KH550 was dissolved in 5ml of absolute ethanol, added dropwise to the system in step 2), sealed and stirred for 4h, and allowed to stand overnight to obtain a highly stable silica sol.

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PUM

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Abstract

The invention relates to high-stability silicon dioxide sol and a preparation method thereof.The preparation method comprises the steps that tetraethoxysilane serves as a precursor, a modifier serves as a core, absolute ethyl alcohol serves as a cosolvent, ammonia water serves as a catalyst, core-shell silicon dioxide sol is prepared through a sol-gel method, and then a certain amount of absolute ethyl alcohol and water are added to adjust the solid content to be 4-6 wt%; and dropwise adding an absolute ethyl alcohol solution of a silane coupling agent, sealing and stirring, and standing overnight, thereby obtaining the product. The modifier provided by the invention can be used for preparing the core-shell type silicon dioxide sol through a simple and feasible method in the preparation of the silicon dioxide sol, and the sol is high in stability, can be stored for a long time and is suitable for large-scale production; the coating is easy to form, core-shell silicon dioxide sol particles are large and uniform in size, transparency of the coating can be guaranteed, the contact angle is large and can reach 158.5 degrees, the surface of a coated object can be covered with a transparent hydrophobic film, the self-cleaning effect is achieved, and the durability of the coating is good.

Description

technical field [0001] The invention relates to the technical field of nano-silicon materials, in particular to a silica sol and a preparation method thereof. Background technique [0002] Silica sol is a dispersion of nano-sized silica particles in water or solvent, and is a colloidal solution. Due to its many excellent properties, such as large specific surface area, fire resistance, high temperature resistance, high stability, etc., silica sol is widely used in chemical industry, materials, textiles, electronics and many other fields. At the same time, silica sol has certain film-forming properties, and its water resistance and heat resistance are better than traditional organic coatings, and the formed coating film is dense and hard. The coating of the hydrophobic material on the surface of the object can bring the effect of cleaning, and the nano-silica sol as the main film-forming substance in the hydrophobic material has been studied a lot, and certain research resul...

Claims

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Application Information

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IPC IPC(8): C09D1/00
CPCC09D1/00
Inventor 陈华进
Owner YANGZHOU POLYTECHNIC INST