CN112795217A - Preparation method of colorless transparent titanium dioxide sol for building material surface self-cleaning - Google Patents
Preparation method of colorless transparent titanium dioxide sol for building material surface self-cleaning Download PDFInfo
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- CN112795217A CN112795217A CN202110050561.2A CN202110050561A CN112795217A CN 112795217 A CN112795217 A CN 112795217A CN 202110050561 A CN202110050561 A CN 202110050561A CN 112795217 A CN112795217 A CN 112795217A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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Abstract
The invention discloses a preparation method of colorless transparent titanium dioxide sol for building material surface self-cleaning, which mainly promotes TiO in the sol through the combined action of two dispersing steps2Degree of dispersion. First step on TiO synthesized by hydrothermal method2Washing and drying to obtain TiO2Nano-particle powder, then large-particle TiO is treated by using a high-energy ball mill under the protection of inert gas at room temperature2Grinding to small particles of nanometer scale can disperse the agglomerates to some extent. The second step is by adding into TiO2Adding polyethylene glycol, sodium hexametaphosphate and sodium carboxymethylcellulose composite dispersant into the sol, and simultaneously adding ethanol to improve the qualitySolubility and dissolution rate. The invention can effectively inhibit TiO in the sol2Aggregation of the nanoparticles. Greatly improves TiO in the sol on the premise of ensuring the stability of the sol and no coagulation2The solid content is 2.5%, the particle size of the formed sol is about 5nm, the extremely high transparency is kept, and the nano coating film formed by covering the nano coating film on the surface of the base material is colorless and transparent.
Description
Technical Field
The invention relates to the technical field of energy environmental protection, in particular to a preparation method of colorless and transparent titanium dioxide sol for self-cleaning of building material surfaces.
Background
There are many types of self-cleaning techniques for exterior walls, super-hydrophobic/super-hydrophilic self-cleaning, photocatalytic self-cleaning, antistatic self-cleaning, etc. The most widely applied technology is the photocatalysis self-cleaning technology, the photocatalyst can be excited to generate electron-hole under the action of sunlight, and the photo-generated electron-hole moves to the surface of the photocatalysis coating to react with adsorbed oxygen, water molecules and the like to generate free radicals to decompose organic dust. TiO is now mostly used commercially2Preparing the sol as photocatalyst into nano sol, and preparing TiO2The nano particles are dispersed in the solvent to form uniform colloid, and a layer of uniform nano coating film is formed on the surface of the base material in an atomization spraying mode, so that the effects of photocatalytic degradation of organic matters and super-hydrophilic self-cleaning are achieved. The self-cleaning process is divided into two stages; in the first stage, organic dirt is decomposed through a photocatalytic process under the irradiation of ultraviolet light; second stage due to TiO2The hydrophilic property of the cleaning agent can clean dust. However, the dispersion degree of the nanoparticles in the sol is not high enough, so that the nanoparticles with small particle size in the sol are agglomerated into large particles, and the transparency of the sol is reduced. After the paint is sprayed on the surface of a building material, a white mark can be formed, and the appearance of the base material is seriously influenced. The photocatalytic self-cleaning sol for the outer surface of a substrate is used for keeping the surface of the substrate clean and unchanged in appearance, so that the TiO is modified2The formula of the photocatalyst sol greatly improves TiO in the sol on the premise of ensuring the colorless and transparent sol2Solid content, and improves the photocatalytic activity and hydrophilicity of the nano coating formed by the product.The preparation method of the colorless transparent titanium dioxide sol is very necessary for various complex external wall applications.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a colorless transparent titanium dioxide sol for self-cleaning of building material surfaces, namely TiO2The whitening phenomenon generated when the nano sol is sprayed on the surface of the base material is improved by adding water-soluble macromolecules into the sol2And (4) nanoparticle dispersibility.
In order to achieve the purpose, the invention is realized by the following technical scheme: the preparation method of the colorless transparent titanium dioxide sol for self-cleaning of the building material surface comprises the following steps:
1. under the conditions of stirring and constant temperature water bath at 40-70 ℃, adding 100ml of absolute ethyl alcohol into a flask, and slowly dropwise adding a certain amount of butyl titanate into the flask to form an ethanol solution of the butyl titanate;
2. 200ml of ethanol is added into a flask and heated in water bath at 40-70 ℃. Adding deionized water 100ml and glacial acetic acid 100ml while stirring;
3. mixing the two solutions, stirring at constant temperature for 4 hr in sealed environment, and standing at room temperature for 12 hr to obtain TiO with solid content of about 2.5%2Sol;
4. the sol is polished at high speed for 8h under the protection of inert gas by a ball mill, and TiO in the sol obtained by reaction is effectively reduced2The granularity of the particles is improved, and the dispersity is improved;
5、TiO2under the condition of violent stirring, adding 1-5% of polyethylene glycol, 0.2-0.5% of sodium hexametaphosphate and 0.1% of sodium carboxymethylcellulose into the sol, adding 10% of absolute ethyl alcohol to improve the solubility and dissolution speed of the dispersing agent, and carrying out constant-temperature water bath at 40-70 ℃ for 30min to obtain the TiO with high dispersibility and high transparency2Sol, coating the sol on the surface of a substrate and naturally drying to form a layer of colorless transparent TiO2And (5) nano coating.
The invention has the following beneficial effects:
1. by adding into absolute ethyl alcoholAdding butyl titanate to prevent hydrolysis of butyl titanate, mixing deionized water and glacial acetic acid, and stirring to obtain TiO granules2Nanoparticles.
2. Large-particle TiO can be grinded by a ball mill at high speed2The aggregate is grinded into small-particle nano particles, so that the dispersibility is improved, and the transparency of the sol is improved.
3. By reaction on TiO2The composite dispersant is added into the sol and stirred, so that TiO can be effectively inhibited2The agglomeration of nano particles improves the dispersion degree and obtains TiO with uniformity and high transparency2And (3) colloid.
4. By increasing TiO content2The dispersion degree of the nano particles can effectively improve the film forming property and transparency of the colloid coated on the surface of the base material, so that the appearance of the base material is not influenced by the nano coating film on the surface.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1, the following technical solutions are adopted in the present embodiment: the preparation method of the colorless transparent titanium dioxide sol for self-cleaning of the building material surface comprises the following steps:
1. under the conditions of stirring and constant temperature water bath at 40-70 ℃, adding 100ml of absolute ethyl alcohol into a flask, and slowly dropwise adding a certain amount of butyl titanate into the flask to form an ethanol solution of the butyl titanate;
2. 200ml of ethanol is added into a flask and heated in water bath at 40-70 ℃. Adding deionized water 100ml and glacial acetic acid 100ml while stirring;
3. mixing the two solutions, stirring at constant temperature for 4 hr in sealed environment, and standing at room temperature for 12 hr to obtain TiO with solid content of about 2.5%2Sol;
4. the sol is polished at high speed for 8h under the protection of inert gas by a ball mill, and TiO in the sol obtained by reaction is effectively reduced2The granularity of the particles is improved, and the dispersity is improved;
5、TiO2under the condition of violent stirring, adding 1-5% of polyethylene glycol, 0.2-0.5% of sodium hexametaphosphate and 0.1% of sodium carboxymethylcellulose into the sol, adding 10% of absolute ethyl alcohol to improve the solubility and dissolution speed of the dispersing agent, and carrying out constant-temperature water bath at 40-70 ℃ for 30min to obtain the TiO with high dispersibility and high transparency2Sol, coating the sol on the surface of a substrate and naturally drying to form a layer of colorless transparent TiO2And (5) nano coating.
The specific embodiment provides a colorless transparent titanium dioxide sol formula for self-cleaning of the outer surface of a building, and TiO in the sol is improved mainly through the combined action of two dispersing steps2Degree of dispersion. First step on TiO synthesized by hydrothermal method2Washing and drying to obtain TiO2Nano-particle powder, then large-particle TiO is treated by using a high-energy ball mill under the protection of inert gas at room temperature2Grinding to small particles of nanometer scale can disperse the agglomerates to some extent. The second step is by adding into TiO2The sol is added with a composite dispersant of polyethylene glycol, sodium hexametaphosphate and sodium carboxymethyl cellulose, and simultaneously, ethanol is added to improve the solubility and the dissolution speed. The dispersant is a good dispersant of a water-soluble dispersion system, and can effectively inhibit TiO in sol2Aggregation of the nanoparticles. Greatly improves TiO in the sol on the premise of ensuring the stability of the sol and no coagulation2The solid content is 2.5 percent, the granularity of the formed sol is about 5nm, the extremely high transparency is kept, the nano coating film formed by covering the nano coating film on the surface of the base material is colorless and transparent, the appearance of the base material is not influenced, the problem that the surface of the photocatalytic self-cleaning coating film is easy to whiten is solved, and the application range of the photocatalytic self-cleaning technology is expanded.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. The preparation method of the colorless transparent titanium dioxide sol for self-cleaning of the building material surface is characterized by comprising the following steps:
(1) adding 100ml of absolute ethyl alcohol into a flask under the conditions of stirring and constant-temperature water bath at 40-70 ℃, and slowly dropwise adding a certain amount of butyl titanate into the flask to form an ethanol solution of the butyl titanate;
(2) adding 200ml of ethanol into a flask, heating in a water bath at 40-70 ℃, and adding 100ml of deionized water and 100ml of glacial acetic acid under the condition of stirring;
(3) mixing the two solutions, stirring uniformly, stirring at constant temperature for 4h in a sealed environment, and standing at room temperature for 12h to obtain TiO with the solid content of 2.5%2Sol;
(4) the sol is polished at high speed for 8 hours under the protection of inert gas by a ball mill, and the TiO in the sol obtained by reaction is effectively reduced2The granularity of the particles is improved, and the dispersity is improved;
(5)、TiO2under the condition of violent stirring, adding 1-5% of polyethylene glycol, 0.2-0.5% of sodium hexametaphosphate and 0.1% of sodium carboxymethylcellulose into the sol, adding 10% of absolute ethyl alcohol to improve the solubility and dissolution speed of the dispersing agent, and carrying out constant-temperature water bath at 40-70 ℃ for 30min to obtain the TiO with high dispersibility and high transparency2Sol, coating the sol on the surface of a substrate and naturally drying to form a layer of colorless transparent TiO2And (5) nano coating.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040100732A (en) * | 2003-05-24 | 2004-12-02 | 대주전자재료 주식회사 | Production Method of Nano-sized Crystalline Titania Powders |
| CN101372394A (en) * | 2007-08-21 | 2009-02-25 | 黑龙江大学 | Method for synthesizing ultra-hydrophilic film using surfactant modified titania |
| CN102658103A (en) * | 2012-04-17 | 2012-09-12 | 太原理工大学 | Preparation method and application of high-active-dispersibility nanometer titanium dioxide |
| CN102786088A (en) * | 2012-09-05 | 2012-11-21 | 中国工程物理研究院核物理与化学研究所 | Preparation method of nano titanium dioxide compound |
| CN104085165A (en) * | 2014-07-21 | 2014-10-08 | 济南大学 | Method for preparing titanium dioxide photocatalyst coating |
| CN110922060A (en) * | 2019-11-27 | 2020-03-27 | 江苏捷斯安环保科技有限公司 | Preparation method and application method of nano titanium dioxide photocatalytic sol |
-
2021
- 2021-01-14 CN CN202110050561.2A patent/CN112795217A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040100732A (en) * | 2003-05-24 | 2004-12-02 | 대주전자재료 주식회사 | Production Method of Nano-sized Crystalline Titania Powders |
| CN101372394A (en) * | 2007-08-21 | 2009-02-25 | 黑龙江大学 | Method for synthesizing ultra-hydrophilic film using surfactant modified titania |
| CN102658103A (en) * | 2012-04-17 | 2012-09-12 | 太原理工大学 | Preparation method and application of high-active-dispersibility nanometer titanium dioxide |
| CN102786088A (en) * | 2012-09-05 | 2012-11-21 | 中国工程物理研究院核物理与化学研究所 | Preparation method of nano titanium dioxide compound |
| CN104085165A (en) * | 2014-07-21 | 2014-10-08 | 济南大学 | Method for preparing titanium dioxide photocatalyst coating |
| CN110922060A (en) * | 2019-11-27 | 2020-03-27 | 江苏捷斯安环保科技有限公司 | Preparation method and application method of nano titanium dioxide photocatalytic sol |
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Application publication date: 20210514 |