KR20000038564A - Coating composition for preventing glass from being dirty and its use - Google Patents

Abstract

PURPOSE: A coating composition comprised of titanium dioxide, silicon dioxide, and solvent, for preventing the surface of glass from being dirty which can improve translucency and durability of the glass surface to be coated by using titanium and inorganic binder, easily workable at room or low temperature, and reduce the frequency of cleaning of the coated glass, is provided. CONSTITUTION: A composition for coating glass to prevent being dirty is containing titanium dioxide, silicon dioxide, and solvent selected from a group comprising methanol or ethanol, also a method for using the coat composition to glass is characteristically comprised of the following steps: cleaning and drying the glass to be coated; applying the coat composition of 40-100cc per square meter to the at least one surface of the glass cleaned; and drying the applied coat composition on the glass surface.

Description

Coating composition for pollutant purification and its use

The present invention relates to a coating composition for purification of contaminants and a method of using the same, and more particularly, by coating a surface of a glass forming a cover such as a lamp and fixing various kinds of contaminants such as dust adhered to the glass. The present invention relates to a coating composition for cleaning pollutants that can reduce the frequency of cleaning and a method of coating the coating composition on a glass surface.

When the lighting fixture is installed and used, various contaminants such as dust adhere to the surface of the cover glass over time, thereby reducing the intensity of lighting. Therefore, in order to restore the intensity of the light again, the cover glass of the lighting fixture is cleaned or cleaned.

In particular, compared to lighting fixtures used in homes, lighting fixtures used in industrial sites, that is, used in factories, as well as street lamps and tunnels on highways, national roads, etc., are polluted more quickly. In order to clean it, much effort and effort were required.

That is, the cover glass surface of the luminaire is best kept clean. However, under poor environmental conditions, their contamination is inevitable, especially in the case of tunnels where it is difficult to discharge automobile fumes and various dusts generated therein, the pollution is more serious.

Therefore, the glass surface of these lamps should be cleaned or cleaned at regular intervals to remove various impurities such as dust attached to maintain proper lighting intensity, which is not only cumbersome but also almost manual, which requires a lot of labor. do.

In particular, in the case of tunnel lighting, the traffic volume is congested and the space is narrow, which causes a lot of risks in the cleaning work, and also implicates many problems such as disturbing traffic communication.

Therefore, reducing the frequency of cleaning such lighting is emerging as an important task. There may be a way to isolate the cover glass surface from contamination, but this is not possible.

Therefore, the present invention is to solve the problems of the prior art using the self-cleaning action of titanium as a photocatalyst.

That is, an object of the present invention is to provide a coating composition for cleaning pollutants that can reduce the frequency of cleaning the glass surface of the lamp to purify the contaminants such as dust is coated on the cover glass surface of the various lights.

Another object of the present invention is to provide a method of using a coating composition for purifying pollutants that effectively applies the coating composition in a cover glass component state, as well as cover glass surfaces such as various lighting lamps already installed or lighting lamps that are not yet installed.

1 is a graph showing a change in dust color difference (ΔE) according to the light irradiation time after the glass surface coated with the coating composition according to the present invention exposed to tobacco dust.

Figure 2 is a graph showing the change in the amount of contamination according to the light irradiation time after the glass surface coated with the coating composition according to the present invention to cigarette smoke.

Figure 3 is a graph showing the change in transmittance over time of the glass surface coated with the coating composition according to the present invention.

Contaminant purification coating composition for achieving the object of the present invention is composed of titanium dioxide (TiO 2), the binder, the solvent and the general characteristics are shown in Table 1.

Table 1

MODEL item ST-K01 ST-K03 Solids concentration 10% 10% TiO2 / binder (wl) 80/20 50/50 Solvent Alcohol, water Alcohol, water P H 1.5 1.5 Viscosity 5 cp 5 cp

Manufacturer: Japan Ishihara Sanyo (ISHIHAL SANGYO CO)

The coating composition of this composition is prepared by putting three raw materials in a stirrer at room temperature and slowly stirring at a speed of 10 to 15 rpm.

In addition, the method of using a coating composition for cleaning pollutants for achieving the object of the present invention can be divided into two. One method is to dry at room temperature after spraying the coating composition, the other is to heat-dry after spray coating the coating composition. This method is dependent on the content of titanium, the firing temperature of titanium is generally around 300 ℃, by using the inorganic binder it is possible to dry the coating composition at a temperature of room temperature or less than 200 ℃. That is, when the titanium content is low, room temperature drying is possible.

The first method capable of drying at room temperature includes one step of washing and drying the glass, two steps of applying the above-described coating composition to at least one surface of the cleaned glass, and three steps of drying the coating composition applied to the glass surface. Is done.

The washing step of the first step may be simply wiped off with water, or may be wiped off again using methanol after washing with water. By using methanol, the glass surface is cleaned more cleanly.

In the two step coating process, the coating composition is applied at one time or two times, using spraying or doping. The coating composition used herein uses the materials shown in Table 1, and the drying conditions are ST-K01 for 30 minutes at 150 ° C, ST-K03 for 30 minutes at room temperature, or 150 ° C.

Coating is usually performed using a spray gun or atomizer coating, and the amount of coating composition to be applied is preferably 40 to 100 mm 3 for 1 m 2 of glass surface. The reason is that if it is used below 40 mW / m2, the self-cleaning capacity is lowered and in fact, it is safe to use a larger amount, but in this case, it is not economical. Therefore, the coating composition is preferably used within the above range.

The three step drying process is carried out at room temperature.

The second method of drying the coating composition at a high temperature includes the first step of washing and drying the glass, the second step of applying silicon dioxide (SiO 2) to at least one surface of the cleaned glass surface, and drying the applied silicon dioxide to form a substrate. It consists of three steps of forming, four steps of applying the coating composition on the base layer, and five steps of drying the applied coating composition.

The washing process of the second method is the same as the first method. However, in case of coating composition on unused glass surface, it is better to simply wipe the glass surface with methanol and then ultrasonically clean it.

The two-stage base layer coating process is preferably carried out at room temperature of less than 70% RH, because if the surface is too humid, the glass surface becomes cloudy after coating.

The drying step of the third step and the fifth step is to proceed for 15 to 30 minutes at 60 to 180 ℃, respectively, it is preferred that the three-step drying step is carried out at 60 to 120 ℃, 5 step drying step at 60 to 180 ℃. The reason for heating and drying the coating composition is that the amount of titanium contained in the coating composition is large, and the drying temperature may vary depending on the content of the titanium.

In the coating composition coating process of step 4, the coating composition is applied to the glass surface in an amount of 30 to 80 m 3 / m 2. The reason why the application amount is reduced in comparison with the first method is due to the difference in the content of titanium. That is, when the content of titanium is large, the amount of the coating composition can be reduced by that much. The coating composition used here is composed of 40 to 50% by weight of titanium dioxide, 10 to 20% by weight of inorganic binder and 40% by weight of solvent.

Hereinafter, a coating composition for purifying pollutants and a method of using the same according to the present invention will be described in detail.

Example 1

30 parts by weight of milky liquid titanium dioxide having a viscosity of 5 cps, 30 parts by weight of silicon dioxide, and 40 parts by weight of methanol were added to a stirrer, and stirred and mixed at a speed of 15 rpm for 30 minutes to prepare a coating composition of the present invention. Hereinafter referred to as coating agent 1.

Example 2

40 parts by weight of titanium dioxide, 20 parts by weight of silicon dioxide, and 40 parts by weight of methanol were added to a stirrer, and stirred and mixed for 30 minutes at a speed of 10 rpm to prepare a coating composition of the present invention. Hereinafter referred to as coating agent 2.

Example 3

50 parts by weight of titanium dioxide, 10 parts by weight of silicon dioxide and 40 parts by weight of methanol were put in a stirrer and stirred and mixed for 30 minutes at a speed of 10 rpm to prepare a coating composition of the present invention. Hereinafter referred to as coating agent 3.

Example 4

After the glass was washed and dried cleanly, one or two coats of coating agent 1 or 2 were applied twice at an amount of 40 m 3 / m 2 at a time, and then dried at room temperature for 24 hours. At this time, the coating was applied using a spray gun (Sample 1, Specimen 2).

This Example 4 is an example for drying the room temperature coating in the installed site without removing the installed lighting fixtures.

Example 5

The glass was wiped clean with methanol, and then ultrasonically cleaned to make a clean coated surface, and spray-coated silicon dioxide at room temperature below 70% RH, dried at 100 ° C. for 20 minutes, and then cooled sufficiently at room temperature to form a substrate.

Next, spray coating agents 2 and 3 on the base layer once with a spray gun and apply evenly in an amount of 60㏄ / ㎡, and then dry in a drying furnace at a temperature of 60 ° C. for coating agent 2 and 150 ° C. for coating agent 3 for 20 minutes. It was cooled to room temperature (called Specimen 3 and Specimen 4).

This method is a method of coating a coating composition on the surface of the cover glass, such as lighting that is not yet installed, or the cover glass parts themselves. However, it goes without saying that the method of Example 4 can be applied here.

In the above embodiments of the present invention, a transparent and smooth glass having a thickness of 5 mm used as a cover glass of a lamp is used.

In order to examine the effect of the coating composition of the present invention, a light transmittance test was performed using a glass plate coated with a coating composition and an uncoated glass plate. Since it was difficult to test in a tunnel or a road site, it was tested using specimen 1 and a control piece (glass plate without coating composition) as the same sample as the cover glass of a lamp.

The self-cleaning (purification) effect of the coating sample after exposing the amount of cigarette smoke mites comparable to vehicle smoke on the glass surface is shown graphically in FIG. 1.

The experimental condition is that the dust color difference ΔE corresponds to the dirt when filling the smoke of one third of the filler material in a space of 1 L through the filter, and the light intensity was 0.1mw / cm 2 in the ultraviolet ray. In the test, the glass is 200 mm (width) × 400 mm (length) × 50 mm (thickness) size, and the glass box is 300 mm (width) × 500 mm (length) × 10 mm (thickness) = 15000 mm. Used. The glass box is an airtight, airtight container. Five cigarettes are filled in the box through a filter. The fluorescent lamp was irradiated for 300 hours at 25 ° C. (20w glimmer, distance 1 m from specimen).

Referring to Figure 1 showing the relationship between the irradiation time and ΔE, it can be seen that there is a very large difference over time between the glass with a coating film and the glass without a coating film.

Figure 2 is a graph of the data of the mind decomposition by the exhaust gas. This corresponds to one month in a heavily polluted tunnel, where BLB was used as a lamp and an accelerated test with a UV intensity of 4mw / cm 2. Referring to the drawings, it can be seen that the self-cleaning effect of the glass with a coating film over time.

Also, the change in transmittance due to contamination of the photocatalytic film (coating film) glass in the tunnel was measured and shown in FIG. 3. Referring to the drawings, it can be seen that the glass with the coating film has a transmittance of 95% (after 4 months), whereas the glass with the coating film shows a 82% transmittance.

As described in detail above, the coating composition for purification of contaminants according to the present invention can not only increase the light transmittance and durability of the glass surface to be coated because the inorganic binder is used in titanium dioxide, and can be coated at room temperature or low temperature. It is possible to economically and quickly cover glass coating work of various lights on the road, and also to reduce the frequency of cleaning the cover glass of the lights, the effect is very excellent. In fact, in the case of using the coating composition according to the present invention, it is possible to give the self-cleaning effect of 3 to 5 years to the glass surface of the lighting fixture by one operation.

Claims (11)

Coating composition for the purification of pollutants composed of titanium dioxide, silicon dioxide and a solvent. The coating composition of claim 1, wherein the solvent is one selected from methanol and ethanol. The coating composition for cleaning pollutants according to claim 1, wherein the coating composition is composed of 20 to 60% by weight of titanium dioxide, 10 to 40% by weight of silicon dioxide, and 30 to 50% by weight of a solvent. Contamination comprising one step of cleaning and drying the glass, two steps of applying the coating composition of claim 1 to at least one surface of the cleaned glass, and three steps of drying the coating composition applied to the glass surface Method of using coating composition for substance purification. The method of claim 4, wherein the coating composition is applied to the glass surface in an amount of 40 to 100 mW / m 2. The method of claim 4, wherein the drying step of the three steps is carried out at room temperature. 1 step of washing and drying the glass, 2 steps of applying silicon dioxide to at least one surface of the cleaned glass surface, 3 steps of drying the applied silicon dioxide to form a base layer, and on the base layer A method of using a coating composition for cleaning pollutants comprising four steps of applying the coating composition of claim 5 and five steps of drying the applied coating composition. 8. The method of claim 7, wherein the first step of cleaning comprises cleaning the glass surface with methanol and then ultrasonically cleaning the glass surface. 8. The method according to claim 7, wherein the two-stage base layer application process is performed at room temperature of less than or equal to 70% RH. 8. The method of claim 7, wherein the drying step of step 3 and step 5 is carried out at 60 to 180 ° C for 15 to 30 minutes, respectively. 8. The method according to claim 7, wherein the coating composition is applied in an amount of 30 to 80 mW / m2 with respect to the glass surface in the four step coating process.