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Method for preparing finishing varnish with photocatalytic activity

A technology of photocatalytic activity and overcoat varnish, applied in the direction of coating, can solve the problems of polymer decomposition, affecting the service life of overcoat varnish, etc., and achieve the effect of high photocatalytic activity

Active Publication Date: 2013-05-22
FIRST NEW MATERIAL TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a kind of preparation method with the photocatalytic active finishing varnish, can solve the nano-titanium dioxide active finishing varnish of current production, because nano-titanium dioxide can produce hydroxyl free radical in the photocatalytic process, thereby can have high Decomposition of molecules will affect the service life of varnishes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] Embodiments of the present invention provide a method for preparing a photocatalytically active finish varnish, the method comprising the following steps:

[0015] Dissolving titanium tetrachloride in cold water to form a solution, adding excess hydrogen peroxide dropwise to the solution to obtain a titanium peroxide complex;

[0016] In the above steps, the amount of titanium tetrachloride is 3g; the amount of cold water is 200g, and the temperature is 0-10°C; the hydrogen peroxide added dropwise to the solution is 1.8-18g of hydrogen peroxide with a mass fraction of 30%;

[0017] Adding ammonia water dropwise to the titanium peroxide complex until the pH of the titanium peroxide complex is 10, stirring and reacting, filtering and washing to obtain hydrated titanium peroxide;

[0018] In the above steps, the ammoniacal liquor added dropwise to the titanium peroxide composite is the ammoniacal liquor with a mass fraction of 25%; the stirring reaction time is 30 minutes;...

Embodiment 1

[0024] This embodiment provides a method for preparing a photocatalytically active finish varnish, the method comprising the following steps:

[0025] Take 43.21g of TiCl4 and dissolve it in 3000g of cold water, then add 50g of hydrogen peroxide with a mass fraction of 30% dropwise into the solution to obtain a titanium peroxide composite. Then, 25% ammonia water was added dropwise to the titanium peroxide composite until the pH was 10, and the stirring reaction was continued for 30 minutes, followed by filtration and washing to obtain hydrated titanium peroxide. Re-dissolve the hydrated titanium peroxide in water, then add 33.3g of nano-silica sol with a mass fraction of 25%, and conduct a hydrothermal reaction at 120°C in an autoclave for 6 hours to obtain the final product nano-titanium dioxide composite dioxide active varnish.

Embodiment 2

[0027] This embodiment provides a method for preparing a photocatalytically active finish varnish, the method comprising the following steps:

[0028] Take 43.21g of TiCl4 and dissolve it in 3000g of cold water, then add 200g of hydrogen peroxide with a mass fraction of 30% to the solution dropwise to obtain a titanium peroxide composite. Then, 25% ammonia water was added dropwise to the titanium peroxide composite until the pH was 10, and the stirring reaction was continued for 30 minutes, followed by filtration and washing to obtain hydrated titanium peroxide. Redissolve the hydrated titanium peroxide in water, then add 720g of nano-silica sol with a mass fraction of 25%, and conduct a hydrothermal reaction at 120°C in an autoclave for 12 hours to obtain the final product nano-titanium dioxide composite dioxide active varnish.

[0029] The nano-titanium dioxide composite silica varnish obtained in the above-mentioned Examples 1 and 2 is evenly rolled onto the elastic napped ...

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Abstract

The invention discloses a method for preparing a finishing varnish with photocatalytic activity, and the method belongs to the field of building coating. The method comprises the following steps of: dissolving titanium tetrachloride into a cold water to form solution, and dripping excessive hydrogen peroxide into the solution to obtain a titanium peroxide compound; dripping ammonia water into the titanium peroxide compound until the pH of the titanium peroxide compound is 10, stirring to react, filtering and washing to obtain hydration titanium peroxide; and dissolving the hydration titanium peroxide in the water, adding nano silicon dioxide sol for hydrothermal reaction, and thus obtaining a product-nano titanium dioxide compound silicon dioxide gel, i.e. the finishing varnish with photocatalytic activity. When the low-temperature decomposition hydration titanium peroxide is adopted by the method to prepare the nano titanium dioxide sol, the nano silicon dioxide sol is added, so that the photocatalytic activity of nano anatase obtained after the reaction is higher, and a film can be formed later due to hydroxyl on a silicon dioxide surface; and the nano titanium dioxide is an inorganic substance and cannot be easily decomposed through the photochemical catalytic reaction of titanium dioxide.

Description

technical field [0001] The invention relates to the field of preparation of varnish materials, in particular to a preparation method of a photocatalytically active finish varnish. Background technique [0002] Nano titanium dioxide is an important semiconductor material. In 1967, Kenichi Honda and Akira Fujishima of the University of Tokyo discovered that titanium dioxide electrodes could decompose water into hydrogen and oxygen under ultraviolet light, which opened the door to the research of photocatalytic materials. [0003] When the photocatalytic material is illuminated, the valence band electrons will be excited to the conduction band, thereby forming electron and hole pairs, which interact with water and oxygen adsorbed on its surface to generate superoxide anions and hydroxyl radicals [0004] At present, the preparation methods of nano-titanium dioxide are mainly divided into two types: gas phase method and liquid phase method. Gas phase methods include chemical va...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12
Inventor 张仁哲刘东华房晓梅
Owner FIRST NEW MATERIAL TECH DEV
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