KR20000013595A - Stain-proofing coating composition and glass product coated with the same - Google Patents

Abstract

PURPOSE: A stain-proofing coating composition is provided to have a good coating property for glass, resin, ceramic and metal materials and hence large thickness of the coating, which causes no degradation of the coating product under heat treatment at a high temperature and effectively prevents a stain on the surface of a substrate. CONSTITUTION: The coating composition comprises boron and sodium carbonate at a molar ratio of 1:0.01 to 1:2, the total content of the boron and sodium carbonate being 1 to 10 wt.% based on the total weight of the aqueous solution. The glass product contains a coating comprising the stain-proofing coating composition. The coating has a thickness of 500 to 2,000 angstroms.

Description

Antifouling coating composition and glass article coated thereby

The present invention relates to an antifouling coating composition and a glass article coated thereby, and more particularly, to a glass article including an aqueous solution containing boric acid and sodium carbonate used as a coating material and a coding film formed thereby. .

Generally, in order to prevent contamination of foreign matters adhered to the surface during the manufacture, packaging, storage, and transportation of glass, resin, ceramic, and metal materials, contamination of the surface before the use of the substrate or to keep the surrounding environment clean A method of physically and chemically removing a substance by washing is used. However, it is difficult to maintain the cleanliness of the substrate surface simply by keeping the surrounding environment clean or removing with a detergent in a place where a large amount of product is handled.

On the other hand, a method of applying a water-soluble salt such as sodium tripolyphosphate, sodium tetraborate or sodium citrate to the surface of a substrate to wash the contaminants adhered to the surface with water or the like is known. 7-000908 and Japanese Patent Laid-Open No. 9-110477. However, in the case of coating by the known method, the coating property is inferior, and because of the thin thickness of the coating film, the coating film may be damaged during the heat treatment at high temperature before the substrate is used, and in the case of the sodium tetraborate There is a problem that a large amount of crystals are deposited on the surface. In addition, in the case of the film coated with sodium citrate, since sodium citrate washed out when washing the coating film with water is an organic acid, there is a problem that the biological oxygen demand and the chemical oxygen demand are increased, resulting in additional costs in wastewater treatment. do.

Moreover, the method of apply | coating a film | membrane using the water-soluble organic substance ester, ester polymer, alcohol polymer, etc. which are melt | dissolved in hot water 30 degreeC or more is also known. However, the method has a disadvantage in that when the heat treatment at a high temperature before using the coated substrate to reduce the thickness of the coating film is a phenomenon that the film is partially or entirely removed, preventing the contamination effectively, even in the process of removing the coating film There is a problem in that additional equipment costs because it should be washed for a long time at 50 ℃ or more not room temperature.

The inventors of the present invention have made intensive studies to solve the above problems, and as a result, when coating the surface of the substrate such as glass, resin, ceramic and metal materials using an aqueous solution containing boric acid and sodium carbonate in a suitable molar ratio, the surface of the substrate The problem that the crystal phase is precipitated in the phase and the environmental problem that occurs when the coated film is removed by washing with water is solved, and the present invention has been completed by confirming that a homogeneous film is formed and does not deteriorate even during the heat treatment at a high temperature.

Accordingly, it is an object of the present invention to provide a composition for antifouling coatings that can effectively achieve adhesion and removal of contaminants from substrates such as glass.

Another object of the present invention to provide a glass article coated by the antifouling coating composition.

The present invention includes boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2, and the total content of the boric acid and sodium carbonate is 1 to 10% by weight based on the total aqueous solution.

In addition, the present invention is another feature of a glass article comprising a coating film formed of the antifouling coating composition.

Referring to the present invention in more detail as follows.

The coating material used to prevent contamination of the surface of the substrate is composed of a material for imparting film firmness and a material for improving coatability. In the composition of the present invention, boric acid is used as a material for imparting film toughness. In addition, since the boric acid has a high solubility in water, the composition of the present invention is easily removed by water in the cleaning process for removing contaminants from the coated substrate, which does not require additional equipment.

Meanwhile, in the composition of the present invention, sodium carbonate or calcium carbonate may be used as the material for improving the coating property, but preferably sodium carbonate.

Boric acid and sodium carbonate in the composition of the present invention is preferably a molar ratio of 1: 0.01 to 1: 2 bar, when the molar ratio is out of the above range, the coating property of the substrate is reduced or the moisture absorption of the surface after coating increases the problem that the coating film is removed There is this.

In addition, the boric acid and sodium carbonate in the composition of the present invention 1 to 10% by weight of the total composition aqueous solution is preferred, there is a problem that the coating properties of the substrate is lowered, if it exceeds 10% by weight increase the coating film thickness Precipitation is likely to occur.

The substrate to which the antifouling coating composition of the present invention is applied is preferably a glass, a resin, a ceramic and a metal material, and a material coated with an organic or inorganic material on the surface of the substrate, and most preferably a glass material.

As a method of coating the composition of the present invention on the substrate may be used by the deposition method, spray method, flow method or rubbing, etc., if the size of the substrate is large and curved surface manufacturing process applied by spray method It is preferable.

When the coating by the composition of the present invention is made, the final coating film thickness on the substrate is preferably 500 to 2000 mm 3, more preferably 1000 to 2000 mm 3. If the thickness of the coating film is less than 500 kPa, there is a problem of deterioration in the case of high temperature heat treatment, and if the coating film exceeds 2000 kPa, crystal precipitation of the coating surface is prone to occur.

On the other hand, it is preferable to use water as a cleaning agent to remove the film coated on the substrate, and the method includes deposition in a washing tank, removal by an ultrasonic apparatus, and spraying by a high pressure spray. By spraying method.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by Examples.

Example 1

0.1 mol of boric acid and 0.05 mol of sodium carbonate are added to 1000 ml of distilled water, followed by stirring to prepare an antifouling coating composition.

Example 2

0.1 mol of boric acid and 0.2 mol of sodium carbonate are added to 1000 ml of distilled water, followed by stirring to prepare an antifouling coating composition.

Comparative Example 1

0.05 mole of boric acid is added to 1000 ml of distilled water and then stirred to prepare a composition for antifouling coating.

Comparative Example 2

0.05 mol of sodium tetraborate is added to 1000 ml of distilled water, followed by stirring to prepare a composition for antifouling coating.

Comparative Example 3

0.05 mol of sodium citrate salt is added to 1000 ml of distilled water, followed by stirring to prepare a composition for antifouling coating.

Production Examples 1-2 and Comparative Production Examples 1-3

A soda lime glass having a width of 30 cm × 30 cm and a thickness of 0.1 cm was washed by rubbing with a surfactant and cerium oxide (CeO ₂ , 50%), washed several times with distilled water, and then dried at room temperature. Subsequently, each of the antifouling aqueous solutions prepared in Examples 1 and 2 and Comparative Examples 1 to 3 was adjusted to 3.0 bar and 1.2 bar, respectively, on the glass substrate, between the spray nozzle and the specimen. The distance of 25 cm, the moving speed of the nozzle was 700 cm / sec, coated by spraying under the conditions of room temperature and 60% humidity, and then heat-treated at 150 ℃ 30 seconds to finally prepare a glass coated with an antifouling aqueous solution.

Experimental Example

In order to investigate the general characteristics of the coating film on the glass substrate prepared in the preparation example and the comparative preparation example was tested as follows.

First, the coating film of the glass substrate prepared in Preparation Example was visually inspected to investigate the coating property after drying, and the thickness of the coating film was measured using an ellipsometer (Plasmos, Germany, SD2100). In addition, the glass substrate was heat-treated at 460 ° C. for 2 hours to investigate whether the glass substrate was deteriorated at high temperature, and then the coating layer was visually observed. The glass substrate was distilled with water to investigate the removal of the coating layer during the cleaning process. Was washed at 3.0 bar pressure for 1 minute and then visually observed.

The results of the experiment are shown in Table 1 below.

division Anti-fouling coating liquid composition Coating after drying Thick film thickness after drying Surface condition after heat treatment Membrane Removability Environmental issues Production Example One Boric acid 0.1 mol sodium carbonate 0.05 mol distilled water ◎ 1000 ◎ ○ none 2 Boric acid 0.1 mol sodium carbonate 0.2 mol distilled water ◎ 1000 ◎ ○ none Comparative Production Example One Boric acid 0.05 mol distilled water ○ 250 × - none 2 Sodium tetraborate 0.05 mol distilled water × 300 × - none 3 Sodium citrate 0.05 mole distilled water △ 300 △ ○ has exist ◎: very good, ○: good, △: normal, ×: poor

As can be seen in Table 1, the glass coated with the composition for preventing contamination of the present invention was excellent in coating properties after drying, and thus the thickness of the coating film formed was found to be thick. All of the castle was excellent. In addition, it was found that within the range of the composition content of the present invention, there is no significant difference in the degree of the overall characteristics.

As described and demonstrated in detail above, the present invention provides a glass article comprising a composition for antifouling coating and a coating film formed thereby. The coating composition of the present invention is excellent in coating properties for glass, resin, ceramics and metal materials, and the resulting coating film is also thick, so that the coating surface is not deteriorated during high temperature heat treatment, thereby effectively preventing the surface of the substrate from being contaminated. In addition, there is an effect that can effectively remove contaminants because the coating film removal properties when cleaning with water or the like.

Claims (3)

In the water-soluble antifouling coating composition, boric acid and sodium carbonate are contained in a molar ratio of 1: 0.01 to 1: 2, and the total content of the boric acid and sodium carbonate is 1 to 10% by weight based on the total aqueous solution. Coating composition. Glass article comprising a coating film formed of the antifouling coating composition of claim 1. The glass article according to claim 2, wherein the coating film has a thickness of 500 to 2000 mm 3.