Nano silicon dioxide emulsion, its preparation method and application

A technology of nano-silica and manufacturing method, applied in latex paint, dyed low-molecular-weight organic compound treatment, coating, etc., can solve the problems of increased dosage, limited dispersibility, rising cost, etc., and achieves good dispersibility and stability performance, improved optical performance, faster response effects

Inactive Publication Date: 2004-10-13
ZHEJIANG YUDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this nano-SiO X There are following deficiencies in the method of modified waterborne paint: the one, nano-SiO X After chemical modification and physical modification, the nano-SiO X dispersion properties, but due to the nano-SiO X The effect of the Van der Waals force between the particles and the agglomeration limit the dispersion; the second is due to the nano-SiO X Insufficient dispersibility, resulting in nano-SiO X The increase in the amount added will increase the cost: third, the application enterprise needs to increase the process steps when using it, and at the same time purchase related special equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 200 grams of colloidal solution (silica sol, commercially available) with a silicon dioxide content of 25%, add 100 grams of industrial ethylene glycol, and mix it into a mixture. After mixing evenly, add A-187 silane coupling agent to the above mixture 5 grams, after mixing for half an hour, add 50 grams of Tween 60 surfactant, and then add water until the total amount of the emulsion is 1000 grams.

[0025] If the silicon dioxide content in the colloidal solution is not 25%, then convert and weigh the colloidal solution with the same net content of silicon dioxide. The following examples are all the same.

Embodiment 2

[0027] Take 800 grams of colloidal solution (silica sol, commercially available) with a silicon dioxide content of 25%, add 100 grams of industrial ethylene glycol, and mix it into a mixture. After mixing evenly, add A-187 silane coupling agent to the above mixture 20 grams, after mixing for half an hour, add 50 grams of Tween 60 surfactant, and then add water until the total amount of the emulsion is 1000 grams.

Embodiment 3

[0029] Take 400 grams of colloidal solution (silica sol, commercially available) with a silicon dioxide content of 25%, add 100 grams of industrial ethylene glycol, and mix it into a mixture. After mixing evenly, add A-187 silane coupling agent to the above mixture 10 grams, after mixing for half an hour, add 50 grams of Tween 60 surfactant, and then add water until the total amount of the emulsion is 1000 grams.

[0030] According to embodiment 1-3, the surfactant Tween 60 (polyoxyethylene sorbitan monostearate) that adds is changed into any emulsifier that is suitable for making oil-in-water structure, and its addition can also be Be 100 grams or 150 grams, other operation is unchanged, still can be protection scope of the present invention.

[0031] In the above embodiment, the surfactant is added last, and then water is added until the total amount of the emulsion is 1000 g. The surfactant and water can be mixed first and then added.

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Abstract

The present invention discloses a nano silicon dioxide emulsion, its preparation method and application. Said emulsion contains nano silicon dioxide, silane coupling agent, surfactant and water. The described nano silicon dioxide and the described silane coupling agent are combined into a hydrophobic particle, and the described hydrophobic particles are covered with surfactant, and dispersed in the water. Its preparation method includes the following steps: adding water-soluble alcohol into the colloid solution of silicon dioxide in the water, then adding silane coupling agent and adding surfactant and water; another preparation method includes the following steps: adding water-soluble alcohol or aqueous solution of described alcohol into nano silicon dioxide gel, then adding silane coupling agent, surfactant and water. Said emulsion can be directly added into the water-based paint, and can be used for modifying water-based paint and improving various properties of the water-based paint.

Description

technical field [0001] The invention relates to a nano silicon dioxide emulsion and its production method and application. Background technique [0002] In recent years, people have done a lot of research on the preparation and application of nano-silica. With the gradual maturity of nano-silica production technology, many studies have tried to apply nano-silica to various fields, but due to the The dispersion of silica affects the modification efficiency and the full play of the modification effect, and also restricts the further popularization and application of nano silica. The application of nano silica in aqueous solvents is generally as follows. [0003] "Fine Chemical Industry" published in August 2002 (Volume Nineteenth Issue No. 8) "Microemulsion Preparation Conditions Effect on Nano-SiO 2 Influence of Particle Morphology and Particle Size Distribution", a nano-SiO 2 Microemulsion, the microemulsion includes surfactant (TritonX-100), n-octanol, cycloethane, water,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/08C09D5/02C09D7/12
Inventor 章浩龙
Owner ZHEJIANG YUDA CHEM IND
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