KR20050122097A - A curtain coated with a photocatalyst containing titanium dioxide and a preparation method thereof - Google Patents

Abstract

The present invention relates to a curtain coated with a titanium dioxide photocatalyst having a self-cleaning, air purifying, antibacterial action and UV absorbing function and a method of manufacturing the same.

Description

A curtain coated with a photocatalyst containing titanium dioxide and a preparation method

The present invention relates to a curtain coated with a titanium dioxide photocatalyst having a self-cleaning, air purification, antibacterial action and UV absorption function and a method for producing the same.

Curtains are typically used for shading or shading, so they are installed in windows and exposed to sunlight. By using this property to coat the photocatalytic material on the curtain can have additional functions in addition to the simple shading function.

The inventors of the present invention are neutral transparent room temperature-curable titanium dioxide coating materials, which have excellent transparency, adhesion, crystallinity, absorbance, and stability, and thus prepare coating materials that can be used as coating agents for polymers, ceramics, and glass paper products. It is described in detail in patent application 2003-21092.

Accordingly, the present inventors have applied the above-described coating material to the curtain, thereby inventing a functional curtain having prevention of contamination by various contaminant components and microorganisms, air purification, antibacterial action, and UV absorption function.

An object of the present invention is to provide a curtain having a neutral transparent room temperature-curable titanium dioxide coating liquid is coated with anti-fouling, air purification, antibacterial action and UV absorption.

Another object of the present invention is a method of manufacturing a curtain having a transparent titanium dioxide coating layer, anti-pollution, air purification, antibacterial action and UV absorption function,

It provides a manufacturing method comprising applying a neutral transparent room temperature-curable titanium dioxide coating liquid to the curtain surface to form a coating layer, and curing the coating layer formed by drying at room temperature.

According to one embodiment of the present invention, a neutral transparent room temperature-curable titanium dioxide coating liquid is coated to provide a curtain having antifouling, air purification, antibacterial action and UV absorption function.

Neutral transparent room temperature-curable titanium dioxide coating liquid used in the present invention is dispersed in 1 to 5% by weight of nanoparticles of titanium dioxide, an organic acid having an alcohol group and a ketone group, an organic acid having an alcohol group and an acetate group and salts thereof or these At least 0.1% by weight of a stabilizer selected from a mixture of a, a basic solution in an amount capable of neutralizing the stabilizer, and the balance is characterized in that it comprises water or alcohol as a solvent.

The alcohol is a C ₁ -C ₄ lower alcohol such as methanol, ethanol, propanol, isopropanol, butanol.

The stabilizer is preferably glycolic acid and glycolic acid salts, organic acids and salts thereof having a structure similar to glycolic acid, oxalic acid and oxalate, or mixtures thereof. In addition, the stabilizer may further include pentinediol, alkyl acetoacetate, polyethylene glycol, cetyltrimethylammonium hydroxide, polyvinylacetate, polyvinyl alcohol, trialkyl alcohol amine ((RO) ₃ N) or mixtures thereof. can do.

Examples of the basic solution include a caustic soda, an alkali metal basic compound, ammonia, an alkylammonium basic compound, an alkaline earth metal group basic compound, or a polyvalent cationic basic compound such as aluminum ions.

The titanium dioxide coating liquid further includes silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), zirconium oxide, iron oxide, or a mixture thereof in the form of nanoparticles to be 50 wt% or less based on the titanium dioxide content. can do. When the organosilicon oxide is further included, the adhesion of the coating solution to the substrate is further improved.

 The method for preparing a neutral transparent room temperature-curable titanium dioxide coating liquid for use in the present invention is described in detail in the specification of Patent Application No. 2003-21092 filed by the present inventors.

In summary, depending on the solvent used,

A) 1 to 50% by weight of a titanium compound and an organic acid having an alcohol group and a ketone group, a step of sequentially adding at least 0.1% by weight of a stabilizer selected from an alcohol group and an organic acid having an alcohol group, and salts thereof to react by dissolving;

B) slowly adding the reacted solution to distilled water with stirring and stirring for 1 hour or more;

C) adding a basic solution to the resulting solution to neutralize the pH to a range of 6-8; And

D) heating the solution at a temperature of 85 ° C. or higher for at least 7 hours to produce a clear and transparent colloidal solution in which titanium dioxide fine particles having anatase structure and a uniform size of less than 10 nm are dispersed.

In the step A), the titanium compound and the stabilizer may be any one of the first method for producing a neutral and transparent, aqueous titanium dioxide coating liquid, characterized in that

a) 50 to 90% by weight of a titanium compound, an organic acid having an alcohol group and a ketone group, an organic acid having an alcohol group and an acetate group, and 0.1% by weight or more of a stabilizer selected from these salts are added sequentially, followed by stirring for 1 hour or more. Making a step;

b) neutralizing the pH to a range of 6-8 by adding a basic solution to the resulting solution; And

c) heating the solution at a temperature of 75 ° C. or higher for at least 7 hours to produce a clear and transparent colloidal solution in which titanium dioxide fine particles having anatase structure and a uniform size of less than 10 nm are dispersed;

In step a), the titanium compound and the stabilizer may be classified into a method for preparing a neutral and transparent, alcohol-based titanium dioxide coating liquid, characterized in that any one may be added first.

Titanium dioxide compounds preferably used in the above methods include titanium (IV) isopropoxide (tetraisopropanol titanium), titanium (IV) butoxide, titanium (IV) ethoxide (titanium tetraethanolate) and titanium (IV). Methoxide, titanium (IV) styrate, or mixtures thereof. The titanium dioxide compound is added in a concentration of 1 to 5% by weight of the titanium dioxide in the form of nanoparticles produced in the coating solution.

If necessary, an organosilicon compound, an aluminum compound, a zirconium compound, an iron compound or a mixture thereof can be added and reacted with the titanium dioxide compound. The organosilicon compound and the like are added in such a ratio that the ratio of TiO ₂ : SiO ₂ and the like dispersed in the resulting colloidal solution is 2: 1 or less.

Further details regarding the method for preparing the titanium dioxide coating liquid, for example, the conditions at each step, the preparation example, and the characteristics of the prepared coating liquid can be easily understood by those skilled in the art with reference to the specification of Patent Application No. 2003-21092. In the present specification, only one preparation example of each of the aqueous and alcoholic titanium dioxide coating solution will be illustrated in the following examples.

According to still another aspect of the present invention, there is provided a method of manufacturing a curtain having a transparent titanium dioxide coating layer and having antifouling, air purification and antibacterial action,

There is provided a method comprising applying a neutral transparent room temperature-curable titanium dioxide coating solution to a curtain surface to form a coating layer, and curing the coating layer formed by drying at room temperature.

The curtain of the present invention may be a curtain of blind, vertical or roll screen type. In addition, the blinds applied to the present invention is a conventional contrast-controlled blinder in which the unit blinds of resin or iron such as polyester are bound with a connecting string.

The application process is usually performed using a spray method. It is preferable that the thickness of a coating layer shall be 1.0 micrometer or less. When the thickness exceeds 1.0 μm, a coating film is formed to easily peel off the coating layer.

Since the curtain of the present invention and the curtain manufactured by the manufacturing method of the present invention have a titanium dioxide coating layer acting as a photocatalyst, various types of radicals are formed when the coating layer is irradiated with light energy (ultraviolet rays) above the band gap of titanium dioxide. Is generated. The generated radicals can decompose microorganisms by strong oxidizing power, and can react with organic substances to decompose environmental hormones and volatile organic compounds in the atmosphere. Titanium dioxide in the coating layer in the form of fine particles having a uniform size of less than 10nm, not only the coating layer is transparent, but also the surface area of the photocatalyst can be widened to perform air purification, antibacterial action and anti-pollution effect efficiently in a short time. Can be.

In addition, the curtain of the present invention and the curtain produced by the manufacturing method of the present invention has a superhydrophilic titanium dioxide coating layer, there is a self-cleaning effect can be easily removed contaminants with water only when washing.

Example

Preparation Example 1 Preparation of Aqueous Coating Solution

175 g tetraisopropanol titanium and 5 g of TEOS (TetraEthoxySilane) were dissolved in 100 mL ethanol, and 5 mL of 40% titanium tetrachloride aqueous solution was added to the hydrolysis reaction with gentle stirring. After 2 mL of pentindiol and 6 g of glycolic acid were added to the resulting solution, the mixture was sufficiently reacted. The solution was slowly added to 750 mL of distilled water with vigorous stirring, and stirring was continued at room temperature for about 1 hour after complete addition. The solution of 3M caustic soda was slowly added to the solution to adjust the pH of the solution to 7. The solution was heated at 85 ° C. for 7 hours to produce a clear and clear titanium dioxide colloidal solution in which titanium dioxide nanoparticles having an anatase structure (10 nm or less) were dispersed.

Preparation Example 2 Preparation of Alcohol-Based Coating Solution

2 mL of pentindiol and 6 g of glycolic acid were dissolved in 800 mL ethanol, and then 175 g of tetraisopropanol titanium and 5 g of TEOS (TetraEthoxySilane) were added thereto. While stirring this solution, 10 mL of 40% titanium tetrachloride aqueous solution was added, and the hydrolysis reaction was performed. At this time, a very vigorous exothermic reaction proceeds, and the reaction is performed until the exotherm stops with sufficient stirring. Then, slowly adding 3M aqueous solution of caustic soda to adjust the pH of the solution to 7, and then heating at a temperature of 75 ° C. or higher for about 7 hours to produce clear transparent titanium dioxide in which titanium dioxide nanoparticles having an anatase structure (10 nm or less) were dispersed. A colloidal solution was produced.

Preparation Example 3 Coating Method of Titanium Dioxide on Blinder

The titanium dioxide colloidal solution prepared in Preparation Example 1 was sprayed with a 1.3 mm multi-hole vortex type nozzle, and was subjected to 0.5 ~ from a polyester blinder (Changshin Co., Ltd.) under a compressor pressure of ⁴ kg / cm ² . After spraying 1 to 2 times at a distance of 1m to form a titanium dioxide coating layer on the front and back surface, it was dried for 2 hours or more at room temperature.

Example 1: Antibacterial Test

The antimicrobial activity of the titanium dioxide coated blinder prepared in Preparation Example 3 was tested according to AATCC TM147 by KATRI (Korea Apparel Testing & Research Institute), and the photographs of the test results were taken and shown in FIGS. 1 and 2. The bacteria used in this test were Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 25922).

As can be seen in the picture of Figure 1 and Figure 2, the blind according to the invention had an excellent antibacterial action.

Example 2: Air Deodorization Test

The air purification effect of the titanium dioxide coated blinder prepared in Preparation Example 3 was carried out for the ammonia (NH ₃ ) gas by the gas detection tube method, the results are shown in Table 1.

Table 1

Test period Air Purification Rate (%) After 30 minutes After 60 minutes After 90 minutes After 120 minutes 99.699.699.899.8

As can be seen in Table 1, the blinder according to the present invention had excellent air purification.

The titanium dioxide coated curtain according to the present invention is excellent in photocatalytic activity and can be used as a multifunctional blinder capable of performing self-cleaning, air purification, antibacterial action, antifouling action and UV absorption action. In addition, the manufacturing method of the titanium dioxide coated curtain according to the present invention is very simple because the coating solution used is neutral and the working environment is excellent and it is cured at room temperature, the operation is performed only by drying without heat treatment.

1 to 2 are photographs showing the test results of the antibacterial action of the titanium dioxide coated blinder according to the present invention.

Claims (7)

Titanium dioxide in the form of nanoparticles is dispersed at 1 to 5% by weight; 0.1 wt% or more of a stabilizer selected from organic acids having alcohol groups and ketone groups, organic acids having alcohol groups and acetate groups, and salts thereof or mixtures thereof; Basic solution in an amount capable of neutralizing the stabilizer; And the remainder of which the surface is coated with a neutral transparent room temperature-curable titanium dioxide coating liquid containing water or alcohol as a solvent, and having a pollution prevention, air purification and antibacterial effect. The method of claim 1, wherein the titanium dioxide coating liquid further comprises a silicon oxide, aluminum oxide, zirconium oxide, iron oxide or a mixture thereof in the form of nanoparticles to be 50% by weight or less based on the titanium dioxide content. Curtain. The curtain according to claim 1 or 2, wherein the stabilizing agent is glycolic acid and glycolic acid salts, organic acids having a structure similar to glycolic acid and salts thereof, oxalic acid and oxalate, or mixtures thereof. The method of claim 1 or 2, wherein the stabilizing agent further comprises pentinediol, alkylacetoacetate, polyethylene glycol, cetyltrimethylammonium hydroxide, polyvinylacetate, polyvinyl alcohol, trialkyl alcohol amine ((RO ₃ N) or a mixture thereof. The curtain according to claim 1 or 2, wherein the curtain is a blinder made of polyester resin or iron. In the manufacturing method of the curtain having a transparent titanium dioxide coating layer, has a pollution prevention, air purification and antibacterial action, Titanium dioxide coating liquid is applied to the curtain surface to form a coating layer, and dried at room temperature to cure the coating layer formed, The titanium dioxide coating solution is dispersed in 1 to 5% by weight of the nanoparticles of titanium dioxide, 0.1 weight of stabilizer selected from an organic acid having an alcohol group and a ketone group, an organic acid having an alcohol group and an acetate group and salts thereof or mixtures thereof. At least%, a basic solution in an amount capable of neutralizing the stabilizer, and the remainder comprising water or an alcohol as the remainder.  7. The method according to claim 6, wherein the coating is performed by a spray method, and the coating layer is formed to have a thickness of 1.0 mu m or less.