KR20200076523A - Coating composition for protection display glass and manufacturing mathod thereof - Google Patents

Abstract

Manufacturers that manufacture or apply display glass are applying laminating film and paper to remove defects that occur during transport or handling of the glass. However, since a scratch, a stain, static electricity, or the like is actually generated, the productivity is decreased. According to the present invention, the laminating film process and the paper process are replaced with a simple coating process, so that intrinsic defects are removed, and the mechanical strength of the light and simple glass itself is increased, thereby, preventing even breaking and cracking, and accordingly, the production yield is increased.

Description

Display glass protective coating composition and manufacturing method therefor {COATING COMPOSITION FOR PROTECTION DISPLAY GLASS AND MANUFACTURING MATHOD THEREOF}

The present invention relates to a coating glass protective coating composition and a method for manufacturing the same, and more specifically, it is possible to prevent defects, etc., which may occur in the process of transporting and handling glass, and at the same time, it is a coating glass protective coating for eco-friendly properties It relates to a composition and a method of manufacturing the same.

The surface of glass melts so slowly that we cannot feel it because Na+ ions are eluted by moisture from soda ash (Na2O), which is a component of glass, when exposed to high temperature and humidity for a long time under closed conditions. That is, the glass is eroded by water and corroded. In addition, weathering occurs when the glass is exposed to moisture and dust in the air for a long period of time, which causes the glass to turn cloudy. When such erosion or corrosion or weathering is performed for a long time, the surface of the glass appears to have dirt or contaminants on it, and the stains on the glass surface are called stains on the glass. Since the occurrence of stains due to corrosion proceeds at a very slow rate, consumers who end-use the glass are not interested in corrosion or weathering of the glass that causes stains. However, manufacturers that manufacture and process glass or those who handle large quantities of glass should pay more attention to the conditions and environment in which the packaged glass does not corrode. The elution of the glass component due to moisture may cause adhesion due to contact between the glass and the glass during long-term storage of the glass, and as a result, separation between the glass and the glass may not be easy. In this case, in the process of handling a large glass, the glass is easily broken because the glass has a low bending strength. In addition, physical damage due to scratches may occur in the production process of glass, the process of glass use, or the transportation of glass, and mechanical stains on the glass surface due to friction between the glass layers may cause defects on the glass surface. It might be.

As such, the occurrence of stains in glass is a major cause of deterioration of the durability of the glass, and the existence of this stain itself causes a fatal problem to the function of the entire glass product. do. Therefore, the manufacturer who manufactures or processes glass, or who handles a large amount of glass, prevents the occurrence of stains due to corrosion or weathering, protects the glass surface during transport and loading during the glass manufacturing process, and handles the final glass. Various efforts have been made to prevent damage to the glass surface due to friction between the glass during transport.

The most effective method currently used for this purpose is the method of attaching the laminating film used by glass manufacturers in the process of glass production, the method of inserting a sheet of paper between glass and glass when packaging glass, or the corrosion inhibitor PMMA and There is a method of adding an interleaving powder such as a mixture of adipic acid. As such, these, called laminating films and glass slips, protect the glass surfaces during transport and loading operations during the glass manufacturing process, buffering against friction and damage between glasses, preventing stains on the glass surfaces, and also disc glass Refers to a functional thin paper inserted between glass and glass for the purpose of preventing static electricity and adhesion between glass and glass surface. In particular, such laminating films and glass sheets are used as display glass such as LCD (Liquid Crystal Display), PDP, Plasma Display Panel (PDP), Organic Lighting Emitted Diode (OLED), and Touch Panel. In the case of very thin glass, it prevents electrostatic and glass-to-glass adhesion of the original glass, and absorbs moisture on the glass surface and is used very effectively to maintain the surface protection of glass products. The biggest problem with the use of glass slipper is that, first of all, the cost of manufacturing laminating film and slipper is never small. In addition, a separate facility investment is needed to insert the laminating film and slip sheet between the glass.

In addition to the method of inserting such a glass slippery, there is also a problem in the method of inserting the interleaving powder used between the glasses. In other words, in the manufacturing process using plain clear glass as the original plate, the interleaving powder applied to the glass surface must be removed by the glass manufacturer. If not, this stain-preventing material may act as an impurity in the processing process. Therefore, in the manufacture of application products using disc glass, the glass cleaning process is very important in terms of the quality of processed glass. The problem is that this cleaning process is not easy. In the washing process, firstly, the glass surface is sufficiently wetted by spraying a detergent solution such as dilute alkali based on the glass surface, and secondly, the detergent residue or powder residue is dehydrated with high-pressure demineralized water or deionized water. Remove it. In addition, the first application of detergent solution is to reduce the force of mutual attraction generated by static electricity between the glass surface and the interleaving powder. Commercially, the glass washing process is carried out at all stages of the continuous processing process, and the optimum washing method should be selected in consideration of various detergents, washing water, and machine parameters of the washing machine.

Therefore, it is possible to prevent the occurrence of stains that cause fatal problems to the function of the entire glass product due to corrosion or weathering, to protect the glass surface during transport and loading during the glass manufacturing process, and to prevent damage to the glass surface due to friction between the glasses. The plan is a very necessary issue in all processes of developing and producing new products by the use of glass, as well as manufacturers of glass products.

The present invention can prevent defects such as scratches and stains that may occur in the process of transporting and handling glass, but it is possible to reduce costs and remove coating films through a simple manufacturing process and washing process compared to conventional methods, and a protective coating composition for glass for display and It is intended to provide a method for manufacturing the same.

In addition, another object of the present invention does not use a volatile organic solvent, only water is prepared as a solvent, and a coating film can be easily removed from a glass sheet simply by using water at room temperature without using a special solvent or mechanical treatment during the washing process. It is to provide a glass protective coating composition for a display and a method for manufacturing the same, which can implement an environmentally friendly coating that can be removed.

The coating composition for protecting glass for display according to an embodiment of the present invention includes a solvent, a polyvinylpyrrolidone/vinyl acetate copolymer (PVP/VA Copolymer), and polyethylene glycol (PEG).

In addition, the solvent is characterized in that the ultra-pure water (DIW, De-Ionized Water).

In addition, the polyvinylpyrrolidone / vinyl acetate copolymer is characterized in that 1 to 15% by weight based on 100% by weight of the coating composition for protecting the glass for display.

In addition, the polyethylene glycol is characterized in that 0.1 to 1.5% by weight based on 100% by weight of the coating composition for protecting the glass for the display.

In addition, the polyethylene glycol is characterized by having a molecular weight of 190 to 420.

In addition, it is characterized in that it further comprises an antistatic agent.

In addition, the antistatic agent is characterized in that it contains 0.1 to 5.0% by weight based on 100% by weight of the coating glass protective coating composition.

In addition, the antistatic agent, Trans-Polyacetylene (Trans-Polyacetylene), cis-Polyacetylene (Cis-Polyacetylene), poly para-phenylene (Poly para-phenylene), poly para-phenylene vinylene (Poly para- Features one or more selected from the group consisting of phenylene vinylene, polypyrrole, polythiophene, polyphenylene sulfide, saturated fatty acid and quaternary ammonium salt Should be

In addition, a surfactant, a surface tension reducing agent, or a mixture thereof is further included.

In addition, mixing of the surfactant and the surface tension reducing agent is further included,

The surfactant, 0.01 to 0.12% by weight based on 100% by weight of the coating glass protective coating composition, the surface tension reducing agent, 0.01 to 0.12% by weight based on 100% by weight of the glass protective coating composition for the display is included It is characterized by.

In addition, it is characterized in that a colorant for the identification of the coating is further included.

In addition, the display glass protective coating composition is characterized in that it is removed from the glass surface through ultrapure water washing.

A method of manufacturing a coating glass protective coating composition according to an embodiment of the present invention is to prepare a coating composition by mixing a solvent, polyvinylpyrrolidone/vinyl acetate copolymer (PVP/VA Copolymer) and polyethylene glycol (PEG) And filtering the coating composition.

In addition, the polyvinylpyrrolidone/vinyl acetate copolymer is contained in 1 to 15% by weight based on 100% by weight of the glass protective coating composition for the display, and the polyethylene glycol is in 100% by weight of the coating glass protective coating composition for the display. It is characterized by containing 0.1 to 1.5% by weight.

The method for treating a glass sheet according to an embodiment of the present invention comprises: preparing a glass sheet coated with a glass protective coating composition for a display as described above, and washing the glass sheet with ultrapure water, thereby coating the glass protective coating for the display And removing the composition.

According to the present invention as described above, it is possible to prevent defects such as scratches and stains that may occur in the process of transporting and handling glass, but it is possible to reduce costs and remove coatings through a simple manufacturing process and cleaning process compared to conventional methods. It is possible to provide a coating composition for protecting glass and a method for manufacturing the same.

In addition, according to the present invention, a volatile organic solvent is not used, only water is prepared as a solvent, and a special solvent is not used even in the washing process, or the coating film is easily removed from the glass sheet by simply using water at room temperature. It is possible to provide a glass protective coating composition for a display capable of implementing an environmentally friendly coating agent and a method for manufacturing the same.

1 is a view for explaining a method of manufacturing a glass protective coating composition for a display according to an embodiment of the present invention.
2 is a view showing a glass sheet coated with a protective coating composition for protecting glass for display according to an embodiment of the present invention.
3 is a view for explaining a processing method of a glass sheet according to an embodiment of the present invention.

Hereinafter, exemplary embodiments related to the present invention will be illustrated in the drawings and described in detail through detailed description. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. .

Hereinafter, with reference to the drawings related to the embodiments of the present invention, it will be described with respect to the display glass protective coating composition according to an embodiment of the present invention and a method for manufacturing the same.

The coating composition for protecting glass for display according to an embodiment of the present invention may include a solvent, polyvinylpyrrolidone/vinyl acetate copolymer (PVP/VA Copolymer), and polyethylene glycol (PEG, Polyethylene Glycol).

The solvent may be environmentally friendly water, and in particular, since the content of particles and the like is extremely low and a washing process using ultrapure water must be applied later, the solvent may be realized as DIW (De-Ionized Water).

Polyvinylpyrrolidone/vinyl acetate copolymer (PVP/VA Copolymer) is a copolymer of PVP (PolyVinylPyrrolidone) and VA (Vinyl Acetate). The present invention presupposes eco-friendliness and intends to use water as a basic solvent without using an organic solvent, so that all kinds of PVP/VA that can be dissolved in water can be a main material for forming a coating film.

PVP (PolyVinylPyrrolidone) is a material produced by polymerizing N-vinyl pyrrolidone on a hydrogen peroxide catalyst, which is a polymer of N-vinyl-2-pyrrolidone, that is, a polymer. It is hopless, soluble in water or alcohol, but hydrocarbon Does not melt. There is no irritation and stability is very high. By detoxifying action, it combines many toxic substances and viruses such as bacteria, pigments, pharmaceuticals, and chemicals to reduce the toxicity, irritation, and activity of these substances, thereby reducing direct toxicity to the human body. The biggest feature is used for detoxification and hypoallergenic action. It is usually applied to foundations to prevent discoloration, and is a substance used as a shampoo, hair dye, toothpaste, and detoxifying drug.

VA (Vinyl Acetate) is a clear, colorless liquid that is slightly soluble in water and vapor is heavier than air and can irritate the eyes and respiratory system. It can be polymerized when heated or polluted, and polymerization reaction takes place inside the container, and is used in the manufacture of adhesives, paints, and plastics. Copolymer of PVP/VA, which is a mixture having the advantages of PVP and VA, may be used as a main material of the coating composition according to an embodiment of the present invention.

In the case of polyvinylpyrrolidone/vinyl acetate copolymer, properties vary depending on the component ratio of PVP and VA. In the coating glass protective coating composition according to an embodiment of the present invention, the composition may have a water-soluble ratio.

For example, the component ratio (PVA:VA) of the polyvinylpyrrolidone/vinyl acetate copolymer may be set to 1:0.3 to 1 or 60:40 to 70:30.

The polyvinylpyrrolidone/vinyl acetate copolymer may contain 1 to 15% by weight, 1 to 10% by weight, or 1 to 7% by weight based on 100% by weight of the coating glass protective coating composition for display, but is not limited thereto.

When the content is less than 1% by weight, the glass protective effect is inferior, and when the content exceeds 15% by weight, the coating film becomes too thick, so it is preferable to use it within the weight%.

Polyethylene glycol may serve as a release agent for increasing an effective cleaning effect in a process for removing the coated thin film later.

The polyethylene glycol may include 0.1 to 1.5% by weight, 0.1 to 1.0% by weight, or 0.1 to 0.7% by weight based on 100% by weight of the coating composition for protecting a glass for display, but is not limited thereto.

If the content is less than 0.1% by weight, the effect as a release agent is reduced, and the residue of the coating composition may remain on the glass even after the washing process. If the content exceeds 1.5% by weight, the coating properties are lowered and the coating film is not well formed, so the content is within the weight%. It is preferred to use.

Polyethylene glycol maintains a liquid or solid state at room temperature depending on its molecular weight. For example, when the molecular weight of polyethylene glycol is 190 to 420, it exists in a liquid state at room temperature, so it is advantageous to use a polyethylene glycol having such a molecular weight when preparing a coating glass protective coating composition. Therefore, PEG 200 (molecular weight 190-210), 400 (molecular weight 380-420) may be used when preparing the actual composition.

On the other hand, PEG 1500 (molecular weight 1400~1600), 4000 (molecular weight 3800~4400), etc. exist in a solid state at room temperature, and in the case of PEG 600 (molecular weight 570~630), precipitation occurs after 3 days, so actual mass production It is difficult to apply to.

By using a polyvinylpyrrolidone/vinyl acetate copolymer and polyethylene glycol to form a glass protective coating composition for display, it is possible to prevent defects such as scratches and stains that may occur during the transportation and handling of glass, while using only ultrapure water. It can be completely removed from the glass surface through an ultrapure cleaning process.

When the coated glass is moved or laminated, static electricity is generated by the surrounding environment, and damage to the glass may occur due to the static electricity. Accordingly, the coating composition for protecting a glass for a display according to an embodiment of the present invention may further include an antistatic agent for removing such static electricity.

The antistatic agent may be included in an amount of 0.1 to 5.0% by weight or 0.1 to 2.0% by weight based on 100% by weight of the coating composition for protecting a glass for display, but is not limited thereto. When the content is less than 0.1%, the antistatic effect is reduced, so it is difficult to separate the glass due to the charging phenomenon, and when the content exceeds 5.0% by weight, the coating properties are deteriorated and the coating film is not well formed, so it is preferable to use it within the weight%.

Antistatic agents are usually cationic surfactants, and include quaternary ammonium salt type and quaternary resin type.

For example, antistatic agents include Benzalkonium Chloride, Benzethonium Chloride, Alkyltrimethylammonium Chloride, Alkylpyridinium halide, and Alkyl Sulphate. One or more may be selected from the configured group.

In addition, anti-static agents include trans-polyacetylene, cis-polyacetylene, poly para-phenylene, and poly para-phenylene vinylene. ), polypyrrole, Polythiophene, Polyphenylene Sulfide, Saturated fatty acid, and one or more selected from the group consisting of quaternary ammonium salt.

For example, saturated fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, and stearic acid. acid), arachidic acid, behenic acid, lignoceric acid, or serotic acid.

On the other hand, the coating composition for protecting glass for display according to an embodiment of the present invention is a surfactant for improving the coating film removal power in the coating film removal process (washing process), for reducing the tension so that the coating composition is applied to the glass well in the coating process Surface tension reducing agents, or mixtures thereof may be further included.

Surfactants may be generally classified into anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants, and one or more of them may be selected. As an example, as the surfactant, lauramine oxide (Lauramine Oxide) may be used.

The surfactant may be included in an amount of 0.01 to 0.12% by weight based on 100% by weight of the coating composition for protecting glass for display, but is not limited thereto.

If the content is less than 0.01% by weight, the effect as a surfactant does not occur, and if the content exceeds 0.12% by weight, it may be problematic to form a coating film.

The surface tension reducing agent is at least one selected from the group consisting of polysiloxane, polyacrylate, polydimethylsiloxane, polyether modified polydimethylsiloxane, and polymethylalkylsiloxane. Can be. However, it is not limited thereto, and may be selected from common materials known as surface tension reducing agents.

The surface tension reducing agent may be included in an amount of 0.01 to 0.12% by weight based on 100% by weight of the coating composition for protecting a glass for display, but is not limited thereto.

If the content is less than 0.01% by weight, the effect as a surface tension reducing agent does not occur, and if the content exceeds 0.12% by weight, excessive surface tension may occur, which may cause problems in coating film formation.

In addition, the coating composition for protecting a glass for display according to an embodiment of the present invention may further include a colorant for distinguishing between coating coated glass and untreated glass (identification of coating).

Accordingly, the glass coated through the glass protective coating composition for display according to an embodiment of the present invention may have a predetermined color, and through this, it may be easily distinguished from untreated glass that is not coated.

The colorant may be a dye or a pigment, but is usually a pigment. The pigment may be an organic pigment or an inorganic pigment. The colorant is not limited to a specific color or material, and may be used as a colorant as long as it is a material that imparts a color sufficient to discriminate coated glass and untreated glass to the coating film.

1 is a view for explaining a method of manufacturing a glass protective coating composition for a display according to an embodiment of the present invention.

Referring to FIG. 1, a method of manufacturing a coating glass protective coating composition according to an embodiment of the present invention may include a coating composition composition manufacturing step (S10) and a filtering step (S20).

In the coating composition preparation step (S10), a coating composition may be prepared by mixing a solvent, polyvinylpyrrolidone/vinyl acetate copolymer, and polyethylene glycol.

As described above, ultrapure water may be used as a solvent, and the component ratio (PVA:VA) of the polyvinylpyrrolidone/vinyl acetate copolymer may be set to 1:0.3 to 1 or 60:40 to 70:30. .

In addition, the polyvinylpyrrolidone/vinyl acetate copolymer may contain 1 to 15% by weight, 1 to 10% by weight, or 1 to 7% by weight based on 100% by weight of the coating composition, but is not limited thereto.

Polyethylene glycol may include 0.1 to 1.5% by weight, 0.1 to 1.0% by weight, or 0.1 to 0.7% by weight based on 100% by weight of the coating composition, but is not limited thereto. In addition, polyethylene glycol may have a molecular weight of 190 to 420.

In addition, in the step of preparing the coating composition (S10), if necessary, an antistatic agent, a surfactant, a surface tension reducing agent, a colorant, or a mixture thereof may be added as an additional material.

The antistatic agent may be included in an amount of 0.1 to 5.0% by weight or 0.1 to 2.0% by weight based on 100% by weight of the coating composition for protecting a glass for display, but is not limited thereto.

For example, antistatic agents include Benzalkonium Chloride, Benzethonium Chloride, Alkyltrimethylammonium Chloride, Alkylpyridinium halide, and Alkyl Sulphate. One or more may be selected from the configured group. In addition, anti-static agents include trans-polyacetylene, cis-polyacetylene, poly para-phenylene, and poly para-phenylene vinylene. ), polypyrrole, Polythiophene, Polyphenylene Sulfide, Saturated fatty acid and Quaternary ammonium salt.

Surfactants may be generally classified into anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants, and one or more of them may be selected. As an example, as the surfactant, lauramine oxide (Lauramine Oxide) may be used.

The surfactant may be included in an amount of 0.01 to 0.12% by weight based on 100% by weight of the coating composition for protecting glass for display, but is not limited thereto.

The surface tension reducing agent is at least one selected from the group consisting of polysiloxane, polyacrylate, polydimethylsiloxane, polyether modified polydimethylsiloxane, and polymethylalkylsiloxane. Can be. However, it is not limited thereto, and may be selected from common materials known as surface tension reducing agents.

The surface tension reducing agent may be included in an amount of 0.01 to 0.12% by weight based on 100% by weight of the coating composition for protecting a glass for display, but is not limited thereto.

The colorant is used to distinguish between coating coated glass and untreated glass (identification of coating), and various types of dyes or pigments may be employed.

In the filtration step (S20), the coating composition is filtered to remove foreign substances such as particles and impurities present in the coating solution prepared in the coating composition preparation step (S10).

At this time, the filtration of the coating composition may be performed through a filter (filter), it is possible to use a filter of a size that can remove 0.3 ~ 0.7um size impurities, but is not limited thereto.

The coating composition for protecting a glass for a display may be manufactured through the manufacturing step (S10) and the filtering step (S20) for the coating composition, and the finished coating composition for protecting a glass for a display may be a dipping method or a spraying method. It can be coated on the glass surface.

FIG. 2 is a view showing a glass sheet coated with a glass protective coating composition for display according to an embodiment of the present invention, and FIG. 3 is a view for explaining a processing method of the glass sheet according to an embodiment of the present invention.

Referring to FIG. 3, a method of processing a glass sheet according to an embodiment of the present invention may include a glass sheet preparation step (S30) and a cleaning step (S40).

In the glass sheet preparation step (S40 ), the glass sheet 10 in which the coating film 20 is present on the surface may be prepared.

At this time, the coating film 20 may be formed on both surfaces of the glass sheet 10, the coating film 20 is formed by coating the glass protective coating composition according to various embodiments described above on the glass sheet 10 Can.

At this time, as a method of forming the coating film 20, dipping that is commonly applied. Spraying, spinning, slitting, chemical bath deposition (CBD), etc. can be used, but the dipping method is used to avoid contact with the surface of the glass sheet 10. Or, it is preferred that the spraying method is used.

In addition, the thickness of the coating film 20 may be set to 0.0001mm to 0.0200mm. If the thickness of the coating film 20 is less than 0.0001mm, there is a problem that a pressing mark may occur between the glass due to particles, and when the thickness exceeds 0.0200mm, it is unreasonable that the film is not formed because it is not dried properly even after the drying process due to the nature of the solution. Can occur.

The glass sheet 10 may be used in a display device, and the coating film 20 may be removed through a cleaning step (S40) through a cleaning device (not shown) before starting a display manufacturing process.

That is, in the cleaning step (S40 ), the glass sheet 10 is washed with ultrapure water, so that the coating film 20 present on the glass sheet 10, that is, the glass protective coating composition for display can be removed.

In the case of the coating composition for protecting glass for display according to an embodiment of the present invention, since it comprises a polyvinylpyrrolidone/vinyl acetate copolymer and polyethylene glycol, only ultrapure water is used without using a separate solvent or mechanical treatment. It can also be removed.

Example 1

Selected as the main polymer

The glass coating material must have adhesion and cohesion to the glass and must have a hydrophilic property that can be easily removed from the glass by forming hydrogen bonds with water molecules during cleaning.

Among water-soluble coating materials, PVV/VA (PolyVinylPyrrolidone/Vinyl Acetate) Copolymer is a copolymer of PVP and VA, which is usually used as a fixative or binding agent for hair. Depending on the type of coating properties (liquid or solid) or solvents (Solvent), the coating properties can be variously implemented.

Since PVP exhibits polarity by nitrogen molecules and can form hydrogen bonds with water molecules, it has a hydrophilic property (Hydrophaic), so it is effective in washing well when washing with water. In addition, since it has a property that is soluble in alkali well, a part that is not removed when washing with water can be removed through alkali cleaning. In addition, PVP is a very safe substance because it has no toxicity or irritation, so there is no human harmful factor for wastewater after cleaning. It is stable up to 100~130 degrees to heat, so there is no discoloration or solubility change due to external temperature. However, although the film forming performance is good, it has the disadvantage that the film strength is weakened with time due to its good moisture repellency.

Since VA does not have a group capable of hydrogen bonding, it has excellent water resistance and water resistance by having water-insoluble properties due to its hydrophobicity (Hydrophobic). In addition, since it has an acetic acid group, it is not crystallized by regular filling of the molecular backbone, so particles due to crystallization are not generated during washing. It has the effect of improving causticity and toughness by copolymerization with other monomers, and has no toxicity to human body since it has no toxicity when washing after coating.

The PVP/VA copolymer, which is a mixture having both the advantages of PVP and VA having these characteristics, was selected as the main polymer.

In addition, in general, a water-soluble type PVP/VA fixed material of 60%/40% was used as the main polymer, and the solvent was also applied as a water-soluble type ultrapure water (DIW) to consider mass productivity in the future. (Ecosystem) was intended to be implemented.

Solvent selection

Since the coating composition according to the embodiment of the present invention forms a coating thin film, and finally, the thin film must be completely removed with ultrapure water, the main solvent is to use the cost side and environmentally stable water (Water). When using distilled water as the main solvent and using ultra-pure water (DIW, De-Ionized Water), no problem occurred when preparing a coating composition solution and forming a coating thin film. However, in order to apply mass production in the field, particles must not be generated in the coating solution.

The case where distilled water and ultrapure water were used as the main solvent was compared through LPC (Liquid Particle Counter). In the case of 1.0 um, it can be seen that, even with an average value, it is markedly improved to about 7.2% with about 1,800 ultrapure waters compared to about 25,000 of distilled waters. In addition, as a result of checking whether impurities were included in the solution, Na and K were detected in the coating solution using distilled water as the main solvent, but the analysis result showed that impurities were hardly detected in the coating solution using the ultrapure solvent. Therefore, it is considered that it is preferable to set the main solvent of the coating composition according to the embodiment of the present invention to ultrapure water.

Anti-static agent selection

In order to prevent static electricity generated during the movement or lamination of glass, it is necessary to add an antistatic agent.

Antistatic agents include trans-polyacetylene, cis-polyacetylene, poly para-phenylene, and poly para-phenylene vinylene as described above. ), polypyrrole, Polythiophene, Polyphenylene Sulfide, Saturated fatty acid and Quaternary ammonium salt, or one or more selected from the group consisting of Benzalkonium One or more may be selected from the group consisting of Benzalkonium Chloride, Benzethonium Chloride, Alkyltrimethylammonium Chloride, Alkylpyridinium halide, and Alkyl sulfate. .

Selection of release agent

Nonionic surfactant polyethylene glycol (PEG, Polyethylene Glycol) was applied as a release agent. The ether bonds constituting PEG are chemically stable, so they are not hydrolyzed at all and can not be propagated by rancidity, mold, or bacteria for long-term storage. Various types have been studied, and among them, PEG (molecular weight of 190 to 420 Mw) having a liquid state at room temperature is applicable to the present invention.

Selection of surface tension reducing agent

In order to form a coating thin film, there must be hydrophilicity with glass, and the contact angle should also be zero. To this end, an appropriate amount of a tension reducing agent must be added to all components.

PVP/VA film formation and cleaning effect

Only the single component of PVP/VA Copolymer, the main component of the coating solution component, was coated with a dipping method on the glass surface according to the concentration, followed by hot air drying. After hot air drying, the surface condition was confirmed by a laser optical measuring instrument. In addition, after checking the surface, the glass surface was checked after cleaning with DIW.

Analysis of coating film shape and presence or absence of coating material after cleaning

As a sample, a mixed solution was prepared according to the PVP/VA Copolymer concentration, and the presence or absence of particles was confirmed after cleaning using a coating film shape and ultrapure water.

Scratch on the PVP/VA Copolymer coating surface showed whether the entire surface was coated, and thus the entire surface was coated, and the same form was confirmed regardless of the concentration. The excitation shape and size of the coating solution through scratch are influenced by the PVP/VA Copolymer concentration, from which the results can be predicted to be due to the thickness of the coating thin film.

In addition, the scratch shape was removed under all conditions after washing with ultrapure water, but a trace amount of particle morphology was confirmed. These particle components are presumed to be PVP/VA Copolymer, and the particle increase with increasing concentration was not confirmed.

In other words. When PVP/VA Copolymer was used as the sole material of the coating composition, it was confirmed that 100% removal was not achieved through ultrapure water.

Example 2

Effect of film formation and cleaning according to PEG mixing on PVP/VA Copolymer

Depending on the PVP/VA Copolymer concentration, the properties of the coating thin film and the surface of the coating after cleaning were checked. The entire coating was made regardless of the PVP/VA Copolymer concentration, and an increase in the thickness of the coating thin film was also confirmed. In addition, after cleaning, it was confirmed whether a trace amount of PVP/VA Copolymer remained on the surface.

After coating with PVP/VA Copolymer alone, the existence of PVP/VA Copolymer was confirmed during cleaning, and thus, it was confirmed that the use of the coating solution with a single material of PVP/VA Copolymer did not meet the purpose. Therefore, PEG (Polyethylene Glycol), which affects the desorption of coating materials, was applied during cleaning.

PEG is a polyether compound used in a variety of applications, from industrial production to medicine. It is also known as polyethylene oxide (Polyethylene Oxide, PEO) or polyoxyethylene (Polyoxyethylene, POE) depending on the molecular weight and is generally expressed as H-(O-CH2-CH2)n-OH. PEG is formed as a liquid or a solid depending on the molecular weight, and is used depending on the application, but the chemical properties have almost the same properties.

In this study, PEG 400 (molecular weight 380-420), 1500 (molecular weight 1400-1600), and 4000 (molecular weight 3800-4400) were tested according to the molecular weight. Here, in the case of PEG 1500 and 4000, there was no problem in coating after heating, but a problem occurred in storage in a synthesized state. When stored in room temperature conditions, PEG4000 precipitated as gelation after about 6 hours and then became a complete solid. It can be used by heating again, but it cannot be used considering mass production. In the case of PEG 1500, there was a difference in time compared to PEG 4000, but after about 3 days, it became a complete solid after 7 days after gelation. In other words, there is no problem in using the coating solution in the form of an aqueous solution by heating, but it is considered that the PEG becomes a state transition to a solid state, so that the two types of PEG described above cannot be used for storage at room temperature after preparing the solution. Is judged.

In the case of PEG 400, it exists as a liquid at room temperature. Therefore, PEG 400 was mixed with PVP/VA Copolymer to confirm the properties and cleaning properties of the coating thin film, and it is expected that PEG 200 (molecular weight 190 to 210) will have the same properties.

Analysis of coating film shape and presence or absence of coating material after cleaning

As a sample, a mixed solution of PEG 400 in a concentration of PVA/VA Copolymer was prepared, and the presence or absence of particles was confirmed after washing using a coating film shape and ultrapure water.

In the shape of the thin film, when the amount of PEG exceeds 1.5% by weight, the coating surface is not properly formed and thickly generated. This is considered to be the case that PEG is more than a step to make the separation between PVP/VA and glass.

After cleaning with ultrapure water, the scratch surface was removed under all conditions. It was confirmed that cleaning was performed from the scratch shape being removed. After cleaning under all conditions, the result of surface confirmation did not confirm the remaining PVP/VA Copolymer.

Example 3

Effect of film formation and cleaning by mixing antistatic agent in PVP/VA Copolymer & PEG mixed solution

As a result of the single coating and cleaning of the main material, PVP/VA Copolymer, the coating shape was confirmed as a surface shape. However, it was confirmed that PVP/VA Copolymer remained in all conditions after cleaning. From this, the coating formation was excellent when PVP/VA Copolymer was used alone, but some were not removed during cleaning, and the cleaning effect was confirmed by adding PEG, which can serve as a release agent containing a surfactant as an additive. However, when mixing more than 1.5% by weight of PEG, the strength of the coated surface was weak, and when laminating coated glass, it was confirmed that the glass surfaces adhered to each other. From this it was confirmed the effect on the strength due to PEG mixing, it was possible to determine the optimal concentration of PEG 400.

In order to prevent damage to the glass due to static electricity, antistatic agents included in the antistatic agent candidate groups described above were added to measure the shape of the coated surface and whether it remained after cleaning, and static electricity.

Surfactants were added to obtain a cleaning effect by removing the thin film with ultrapure water after forming the coating thin film. The surfactant was appropriately selected as anionic (Negative Ion) and cationic (Positive Ion) and added in a small amount. This is because when the amount added is a lot of bubbles due to the nature of the surfactant, this may cause more irrationality due to bubbles when removing the coating thin film.

Analysis of coating film shape and presence or absence of coating material after cleaning

As shown in Table 1, a solution was prepared by adding an antistatic agent to PVP/VA Copolymer, PEG 400, and a trace amount of surfactant was added for a cleaning effect. Coating and cleaning were performed using each prepared solution. In order to check whether the entire surface was coated, a scratch was made on the coated surface to check whether or not it was coated on glass.

In addition, PVP/VA Copolymer was experimented by changing 2.0% by weight within the range, and PEG was changed by 0.2% by weight within the range. In addition, in the case of the antistatic agent, the experiment was conducted by changing 0.1 wt%, 0.5 wt%, and then 0.5 wt% within the range, and the surface tension reducing agent and surfactant were 0.01 wt%, 0.04 wt%, and 0.07 within the range. The experiment was conducted while changing to weight%, 0.10% by weight, and 0.12% by weight.

Under the corresponding test conditions, no change in the shape of the coating was observed, and it appeared as a front coating regardless of concentration, and showed a surface shape. After cleaning, it was confirmed that no residue was present in all conditions. In addition, as a result of checking after cleaning, it was determined that no scratches were found, so that the slip property of the thin film was high.

Ingredient/Test content PVP/VA (wt%) 1.0~15.0 PEG (wt%) 0.1~1.5 Antistatic agent (wt%) 0.1~5.0 Surface tension reducing agent 0.01~0.12 Surfactants 0.01~0.12 DIW (wt%) 78.26~98.78 Total (wt%) 100

Electrostatic analysis of coating film

As a result of experiments while changing the content of the antistatic agent, the amount of static electricity also tended to decrease as the content of the antistatic agent increased. This data value shows that the amount of static electricity was slightly reduced than that of the antistatic agent only added to the PVP/VA Copolymer. This is because the release agent of PEG 400 has the property to hop water, and after forming a thin film as in the case of synthesis with the antistatic agent It can be said that the moisture in the air when exposed to the atmosphere is a hop effect. The measured data value was measured slightly lower as the content of the antistatic agent increased, so that it could take a margin for the process. At the time of measurement, the temperature of the environment was 20.0°C and the relative humidity was 56.0%.

Laminating film is applied or interleaved to prevent the occurrence of stains that cause fatal problems in the function of the entire glass product, to protect the glass surface during transport and loading during the glass manufacturing process, and to prevent damage to the glass surface due to friction between the glasses. The method of adding powder between glass or inserting a glass slip between glass was used. The method of using a laminating film and a sheet for protecting glass is expensive due to the use of expensive devices and materials, and a method of adding interleaving powder between glasses requires a high-precision cleaning process separately.

In order to solve the above problems, the present invention protects the surface of the glass by forming a coating film to remove defects that may occur during transport and handling on the glass surface without using a laminating film and a glass slipper, as well as protecting the glass surfaces. It is possible to suppress the occurrence of scratches that may occur in the process due to the high mechanical strength of the film, and at the same time, to further increase the strength of the glass itself by coating, thereby reducing the defect rate for glass breakage, thereby increasing production yield. It is an object to provide a coating composition and a method for manufacturing the same. In addition, when using a coating agent that achieves the above-mentioned purpose, a separate labeling material may be additionally included in order to distinguish between used and unused. In particular, the coating composition according to the embodiment of the present invention can be applied to and used for thin glass for manufacturing display panels.

Those of ordinary skill in the art to which the present invention pertains will appreciate that the present invention may be implemented in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims, which will be described later, rather than the detailed description, and all the changed or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted.

10: glass sheet
20: coating film

Claims (15)

menstruum;
Polyvinylpyrrolidone/vinyl acetate copolymer (PVP/VA Copolymer); And
Polyethylene glycol (PEG); Glass protective coating composition for a display comprising a. According to claim 1,
The solvent, ultra-pure water (DIW, De-Ionized Water) glass protective coating composition for a display, characterized in that. According to claim 1,
The polyvinylpyrrolidone / vinyl acetate copolymer, the glass protective coating composition for a display, characterized in that contained 1 to 15% by weight relative to 100% by weight of the coating glass protective coating composition. According to claim 1,
The polyethylene glycol is 0.1 to 1.5% by weight based on 100% by weight of the coating glass protective coating composition for the display glass protective coating composition for display. According to claim 1,
The polyethylene glycol has a molecular weight of 190 to 420, characterized in that the glass coating protective composition for a display. According to claim 1,
A coating composition for protecting a glass for a display, further comprising an antistatic agent. The method of claim 6,
The antistatic agent, the glass protective coating composition for a display, characterized in that contained 0.1 to 5.0% by weight relative to 100% by weight of the coating glass protective coating composition The method of claim 6,
The antistatic agent,
Trans-Polyacetylene, Cis-Polyacetylene, Poly para-phenylene, Poly para-phenylene Vinylene, Polypyrrole ), Polythiophene, Polyphenylene Sulfide, Saturated fatty acid and Quaternary ammonium salt. Composition. According to claim 1,
Surfactant, surface tension reducing agent, or a glass protective coating composition for a display, characterized in that further comprises a mixture thereof. The method of claim 9,
Mixing of the surfactant and the surface tension reducing agent is further included,
The surfactant, 0.01 to 0.12% by weight based on 100% by weight of the coating glass protective coating composition for the display,
The surface tension reducing agent, the glass protective coating composition for a display, characterized in that contained in the 0.01 to 0.12% by weight relative to 100% by weight of the coating glass protective coating composition. According to claim 1,
A coating composition for protecting a glass for a display, further comprising a colorant for identification of coating. According to claim 1,
The glass protective coating composition for a display, the glass protective coating composition for a display, characterized in that is removed from the glass surface through ultrapure water washing. Preparing a coating composition by mixing a solvent, polyvinylpyrrolidone/vinyl acetate copolymer (PVP/VA Copolymer) and polyethylene glycol (PEG); And
Filtering the coating composition; Method for producing a glass protective coating composition for a display comprising a. The method of claim 13,
The polyvinylpyrrolidone / vinyl acetate copolymer is contained in 1 to 15% by weight based on 100% by weight of the coating composition for protecting glass for the display,
The polyethylene glycol is a method for producing a glass protective coating composition for a display, characterized in that 0.1 to 1.5% by weight based on 100% by weight of the coating glass protective coating composition. A method for treating a glass sheet coated with the coating composition for protecting a glass for display according to claim 1,
Preparing a glass sheet coated on the surface of the display glass protective coating composition; And
Removing the glass protective coating composition for the display by washing the glass sheet with ultrapure water; The processing method of the glass sheet containing.

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