KR20110056130A - Coating composition for protecting the glass surface and method thereof - Google Patents

Abstract

PURPOSE: A coating agent for protecting the surface of glass and a method for manufacturing the same are provided to sufficiently protect the surface of the glass in a cutting or polishing process by being composed of components similar to glass. CONSTITUTION: A coating agent for protecting the surface of glass includes a silane-base component and a silica-contained component. The coating agent is based on siloxane bond. The coating agent includes methyltriethoxysilane, ethylsilicate, and nanosilica. A method for manufacturing the coating agent includes the following: A first intermediate including methyltriethoxysilane and ethylsilicate is prepared. Hydrochloric acid is added to the first intermediate in order to obtain second intermediate. Nanosilica is added to the second intermediate. A refluxing process is implemented at temperature higher than room temperature.

Description

Coating composition for protecting the glass surface and method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for protecting a glass surface during thin glass processing, and to a method of manufacturing the same. The present invention can effectively protect a glass surface upon cutting of a thin glass sheet and cutting an edge of a cut thin glass cell coated on the glass surface. To a coating composition.

Thin tempered glass, which is used as a display window for mobile terminals such as mobile phones, PDPs, navigation, notebooks, etc., is divided into small cell units after cutting, polishing, etc. from large glass sheets.

It is important to protect the glass surface from scratches, blemishes, whitening, and the like during the processing.

Conventionally, it was common to remove a protective film or ink after performing a process of cutting, grinding | polishing, etc. in the state which coated a protective film on the glass surface or screen-printed with ink.

However, such a protective film is wound on a polishing tool that rotates at high speed in the edge polishing process, causing the polishing machine to malfunction or lose its surface protection function, and in the case of ink, the surface is damaged by chemicals during peeling. Subjects frequently lost surface protection.

In addition, the film is often insufficient to protect the glass surface by losing the hardness and becoming cloudy by contact with the cutting oil used in the edge polishing process.

Therefore, there is a need for a technique capable of sufficiently protecting the glass surface in the cutting and edge polishing process of the glass thin sheet.

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a coating that can sufficiently protect the glass surface even in a cutting and polishing process.

In particular, it is an object of the present invention to provide a coating agent composed of a component similar to the glass component, which is excellent in adhesion to the glass surface and capable of sufficiently protecting the glass surface in the environment of a cutting or polishing process.

As a technical idea for achieving the above object, in the present invention,

As a first aspect,

A glass surface coating agent comprising a silane component and a component including silica is provided and comprises a siloxane bond.

On the other hand, it is characterized in that it comprises methyl triethoxysilane, ethyl silicate, nano-silica,

On the other hand, when the weight of methyl triethoxysilane is 1,

Methyltriethoxysilane 1, 0.2 to 0.3 of ethyl silicate, 0.035 to 0.1 of nano silica, 0.25 to 0.35 of ethanol, 0.00075 to 0.001 of hydrochloric acid, and 0.4 to 0.6 of pure water.

As a second aspect,

In the method for producing a glass surface coating agent,

(a) preparing a mixed first intermediate comprising methyltriethoxysilane, ethylsilicate; (b) adding hydrochloric acid to the first intermediate to form a second intermediate; (c) adding nanosilica to the second intermediate; (d) refluxing to a temperature higher than room temperature; a method for producing a glass surface coating, further comprising;

On the other hand, step (b) is characterized in that the 0,1N hydrochloric acid aqueous solution is added dropwise over 2 to 3 hours,

On the other hand, the step (c) is characterized in that the solid content of 30% nanosilica dispersion is added dropwise,

On the other hand, step (d), characterized in that the reflux for 4 to 6 hours in a round container at 50 ~ 60 ℃,

On the other hand, in the step (a), ethanol, pure water is further included and mixed,

Methyltriethoxysilane 1, ethyl silicate 0.2 ~ 0.3, nano silica 0.035 ~ 0.1, ethanol 0.25 ~ 0.35, hydrochloric acid 0.00075 ~ 0.001, characterized in that the composition is composed of a weight ratio of 0.4 ~ 0.6.

According to the present invention, the coating agent is composed of a component similar to the glass component, has excellent adhesion to the glass surface, there is an effect that can sufficiently protect the glass surface in the environment of the cutting or polishing process.

In addition, when the coating film peeling off can be peeled off with a weak toxicity can create an environment-friendly working environment.

Hereinafter, the configuration and operation of the embodiment of the present invention will be described in detail.

Table 1 below shows the composition of the various experimental samples according to the embodiment of the present invention (unit (grams)).

First sample Second sample Third sample Fourth sample Methyltriethoxysilane 150 50 200 200 Ethyl silicate 200 200 50 50 Nano Silica Dispersion 0 0 0 30 ethanol 35 28 70 60 0.1N HCl aqueous solution 62 73 62 52 pure 100 100 100 100

Using the composition components for each of these samples to prepare a coating composition in the following manner.

<Preparation method 1> (when no nano silica dispersion is added)

First, methyltriethoxysilane, ethyl silicate, ethanol, and pure water are mixed and stirred uniformly at room temperature to form a first intermediate.

Next, 0.1N HCl aqueous solution is slowly added dropwise to the first intermediate over 2 to 3 hours to prepare a siloxane (Si-O-Si) compound as the second intermediate.

Next, the mixture was stirred for 1 hour at room temperature, and the reaction was performed for 4 to 6 hours under reflux in a 1 L round flask while maintaining the temperature at 50 to 60 degrees to obtain a resultant nanocomposite inorganic polysiloxane coating solution.

<Manufacturing Method 2> (When Nanosilica Dispersion is Added)

First, methyltriethoxysilane, ethyl silicate, ethanol, and pure water are mixed and stirred uniformly at room temperature to form a first intermediate.

Next, 0.1N HCl aqueous solution is slowly added dropwise to the first intermediate over 2 to 3 hours to prepare a siloxane (Si-O-Si) compound as the second intermediate.

Next, the nano-silica dispersion (Ludox-LS solid content 30%, the average size of the silica particles 10 ~ 15nm) was added dropwise to the second intermediate while stirring for 1 hour at room temperature, the temperature is 50 ~ 60 degrees While maintaining, the reaction was refluxed in a 1 L round flask for 4 to 6 hours to obtain a resultant nanocomposite inorganic polysiloxane coating solution.

Table 2 below shows the results of inspection of the thin glass plate after cutting and polishing using the composition component of Table 1 and the composition sample prepared by the above manufacturing method.

First sample Second sample Third sample Fourth sample Scratch resistance Good Very good Not good Good Peeling by pressure Some damage Not good Good Good Immersion Resistance Good Good Some damage Very good

From Table 1 and Table 2 the following conclusions can be obtained.

As the ratio of methyl triethoxy silane to ethyl silicate is smaller than 1, it can be seen that the scratch resistance is better and the bleeding resistance is good, but the peeling by pressure is severe.

In order to overcome this, when the ratio of methyl triethoxysilane to ethyl silicate is greater than 1 (about 4), the peeling phenomenon due to pressure is overcome, but the scratch resistance and the peeling resistance are unsatisfactory.

In order to maintain the peeling effect due to pressure well while adding the nano-silica dispersion (30% solids) in order to improve the scratch resistance and resistance to scratching, all three characteristics were obtained.

At this time, when the ratio of methyl triethoxy silane to ethyl silicate exceeds 5, the cutting and polishing process is completed, a toxic peeling agent should be used when peeling the coated coating film, it could damage the glass surface.

Although the fourth sample shows the optimum composition ratio, effective results can be obtained even within the following ranges.

When the weight of methyl triethoxysilane is 1,

Ethyl silicate 0.2 ~ 0.3

Nanosilica 0.035 ~ 0.1 (only considering solids in nanosilica dispersion)

Ethanol 0.25-0.35

Hydrochloric acid 0.00075 ~ 0.001 (only pure hydrochloric acid in hydrochloric acid solution is considered)

Pure 0.4 ~ 0.6

It can be formulated as.

The coating solution prepared as above has the following characteristics.

1. It is non-toxic, inorganic and flame retardant, so there is no environmental hormone substance and no harmful substances are generated.

2. Since it is a silicon-based compound that forms a siloxane bond, the glass and its components are similar, so it has excellent adhesion to the glass surface when coating, and can be coated with a thickness of 6 to 40㎛ at a pulling speed of 2 to 15 cm / sec by a deep method. It is possible to prevent the glass surface from being damaged by the binary substance.

3. The coating liquid has a viscosity paint (Zahn Cup # 2) characteristics of 5-30 seconds.

4. After coating on glass surface, it can endure more than 20 minutes at 70 ℃ water temperature during cutting process by waterjet cutting device (water jet method) and other cutting device, and protect glass surface from scratch, stamping, whitening, etc. Can be. In particular, it is possible to prevent damage to the glass surface with traces of the adsorption means for preventing the surrounding whitening phenomenon and fixing the glass sheet during hole drilling.

5. After coating, it can withstand up to 10 minutes at 90MPA adsorption pressure for cutting oil during edge grinding process.

6. After coating, it can endure hardness above 1H ~ 9H. This is adjusted according to the content of the nanosilica dispersion.

7. The peeling of the coating after cutting and polishing is peeled off by a water-soluble weak alkaline releasing agent, and after peeling, no insoluble salts are formed and there is no damage to the glass surface.

The incidence of defects (defects such as scratches on the surface of the glass, scratches, etc.) during the cutting and edge polishing processes of the glass sheet coated with the coating agent was very good. Particularly, the whitening around the hole during waterjet cutting was flawless. It was good.

The present invention is a coating composition coated on the glass surface in order to protect the glass surface from scratching, stamping, whitening, etc. when cutting and polishing the thin glass sheet, the cell phone is used in the laminated glass sheet processing industry as well as the processed thin glass cell It can also be usefully used in related industries such as portable terminals such as PDP, PDA and the like.

Claims (8)

A glass surface coating agent comprising a silane component and a component including silica, and comprising a siloxane bond. The method according to claim 1, A glass surface coating composition comprising methyltriethoxysilane, ethyl silicate, and nanosilica. The method according to claim 2, When the weight of methyl triethoxysilane is 1, Methyltriethoxysilane 1, ethyl silicate 0.2-0.3, nanosilica 0.035-0.1, A glass surface coating composition further comprising 0.25 to 0.35 ethanol, 0.00075 to 0.001 hydrochloric acid, and 0.4 to 0.6 pure water. In the method for producing a glass surface coating agent, (a) preparing a mixed first intermediate comprising methyltriethoxysilane, ethylsilicate; (b) adding hydrochloric acid to the first intermediate to form a second intermediate; (c) adding nanosilica to the second intermediate; (d) refluxing to a temperature higher than room temperature; the method of producing a glass surface coating, characterized in that it further comprises. The method according to claim 4, In the step (b), a 0,1N hydrochloric acid aqueous solution is added dropwise over 2 to 3 hours to produce a glass surface coating agent. The method according to claim 4, The step (c) is a method for producing a glass surface coating, characterized in that the addition of the dropwise addition of the nano-silica dispersion having a solid content of 30%. The method according to claim 4, The step (d) is a method for producing a glass surface coating, characterized in that reflux for 4 to 6 hours in a round container at 50 ~ 60 ℃. The method according to claim 4, In the step (a), ethanol, pure water is further included and mixed, Methyltriethoxysilane 1, ethyl silicate 0.2 ~ 0.3, nano silica 0.035 ~ 0.1, ethanol 0.25 ~ 0.35, hydrochloric acid 0.00075 ~ 0.001, pure water 0.4 ~ 0.6 to prepare a glass surface coating agent, characterized in that the composition Way.