KR19990010441A - Filling liquid composition for cathode ray tube and manufacturing method of screen film using same - Google Patents

Abstract

The present invention provides a composition for forming a film of film for forming a metal film of a cathode ray tube screen film, wherein the film composition contains 30 to 35% by weight of an acrylic emulsion containing an acrylic resin, 2 to 3% by weight of an ammonium oxalate, and a wetting agent. It provides a filming composition for cathode ray tubes, characterized in that it comprises 2 to 3% by weight, pore generator 0.7 to 0.9% by weight, binder 0.3 to 0.5% by weight and the rest of the pure water. According to the present invention, it is possible to reduce manufacturing time and cost by omitting the drying process of the conventional filming film forming process, and at the same time to eliminate the risk of explosion in the lacquer-type peel mill process that has been commonly used. Can be.

Description

Filling liquid composition for cathode ray tube and manufacturing method of screen film using same

The present invention relates to a cathode liquid tube peeling liquid composition and a method for producing a screen film using the same, by eliminating the drying step of the conventional film forming film (filming) process to reduce the manufacturing time and cost and at the same time used lacquer The present invention relates to a peeling liquid composition for a cathode ray tube capable of removing an explosion hazard in a (laquer) type mill mill process and a method of manufacturing a screen film using the same.

Referring to Figure 1 briefly described the structure of the cathode ray tube screen film and its manufacturing process as follows.

The screen film of the cathode ray tube forms a black matrix 2 on the remaining portion of the panel 1 except for the pixel formation region, and forms a fluorescent film 3 for pixel formation by photolithography using a photosensitive resin thereon. After forming, the film is manufactured by applying or spraying a filming solution on the fluorescent film 3 to form a film 4 as an intermediate film and then depositing a metal film 5 thereon.

The peeling film is then removed by high temperature heating, and thus the upper metal film is provided spaced apart from the phosphor layer at a predetermined interval.

Phosphor particles of the fluorescent film collide with electrons emitted from the electron gun and emit light. In this case, the emitted light is emitted in all directions including the front and rear surfaces of the panel. Therefore, the luminance of light emitted from the entire surface of the panel on which the image is formed is significantly lower than the actual amount of light emitted by the phosphor. In order to solve this problem, a metal deposition film is formed on the fluorescent film. Here, the metal deposition film serves to greatly increase the luminance at the front of the screen film by reflecting the light emitted to the back surface to the front.

As the metal deposition film, a film formed using aluminum having a small specific gravity and capable of transmitting high energy electrons without energy loss is mainly used.

However, since the phosphor film formed on the inner surface of the panel has a non-uniform size of phosphor particles and its surface is uneven, if aluminum is directly formed on the phosphor layer, metal enters between the phosphor layers, thereby obtaining a uniform and continuous reflective film. There will be no. As a result, light leaks through the discontinuous points, so that the amount of specular reflection is reduced, thereby not sufficiently improving the emission luminance of the phosphor.

In order to efficiently reflect the light emitted to the rear surface to the front surface, it is preferable to form the aluminum film flat with a predetermined distance from the fluorescent film. To this end, an intermediate film made of an organic substance decomposed at a predetermined temperature is applied to the upper part of the fluorescent film to form a smooth film, and aluminum is deposited on the upper part of the film, and then heated at a predetermined temperature to decompose the organic material layer. . When the film is formed, a flat aluminum film may be formed on the fluorescent film to be spaced apart at a predetermined interval.

The method of forming the film can be divided into a method of using an aqueous acrylic emulsion composition and a method of using an oil-based lacquer.

The aqueous peeling liquid composition contains polyvinyl alcohol, an acrylic emulsion, and the like as ammonium hydroxide, hydrogen peroxide, and the like. In the film forming process using this composition, a step of forming an aluminum film and then firing at a temperature of about 400 to 450 ° C. in order to decompose and remove organic matter in the film is necessary. However, since there is a process of frit sealing again in the temperature range of 400 to 450 ° C. for the panel and the funnel to be combined, the film is double fired.

In the conventional liquidening liquid composition, acrylic emulsion B-74, which is mainly used as a main component, has a molecular weight of about 4 million and a decomposition start temperature of 300 ° C. or more, so that frit sealing is performed immediately without undergoing a separate firing process for organic matter decomposition. If decomposing the organic material of the film is slowed down, the decomposition gas of organic matter remains at the softening point of the frit and the crystallization temperature of 400 to 450 ° C., thus preventing the frit sealing, making it difficult to completely seal or even the sealing. The gas remains in the cathode ray tube without being completely burned, which adversely affects the lifespan, brightness, and the like of the cathode ray tube. Therefore, a separate firing process for organic decomposition and removal is essential.

A method of using an oil-based lacquer is a method of forming a flat organic film by spraying a composition containing a hydrophobic solvent such as methyl ethyl kecon, xylene, toluene and an acrylic organic material on top of a fluorescent film coated with a wetting agent. According to this method, compared to the method using an aqueous acrylic emulsion, an intermediate film having excellent flatness can be obtained, and since the amount of organic matter is small, the firing process for removing organic matter can be omitted. However, since organic solvents such as xylene and toluene are flammable, there is a high risk of fire, requiring a separate ventilation facility and a complicated process.

The first technical problem to be achieved by the present invention is to solve the above problems, there is no risk of fire and explosion, and excellent adhesion, and to provide a curing liquid composition for cathode ray tube that is rapidly cured and dried.

The second technical problem to be achieved by the present invention is to provide a method for producing a screen film by using the peeling liquid composition to simplify the process and reduce manufacturing cost and time.

1 is a cross-sectional view showing a screen configuration of a conventional cathode ray tube.

Explanation of symbols for the main parts of the drawings

1. Panel 2. Black Matrix

3. Fluorescent film 4. Filming film

5. Metal film

In order to achieve the first object of the present invention, in the present invention, in the composition for forming a film film as an intermediate film for forming a metal film of the cathode ray tube screen film, 30 to 35% by weight of the acrylic emulsion containing an acrylic resin, oxalic acid It provides a film composition for cathode ray tube, characterized in that it comprises 2 to 3% by weight of ammonium, 2 to 3% by weight of wetting agent, 0.7 to 0.9% by weight of pore generator, 0.3 to 0.5% by weight of binder and the rest of the pure water. .

A second object of the present invention is to form a fluorescent film on the inner surface of the panel on which the black matrix is formed; 30 to 35% by weight of an acrylic emulsion containing acrylic resin on top of the fluorescent film, 2 to 3% by weight of ammonium oxalate, 2 to 3% by weight of wetting agent, 0.7 to 0.9% by weight of pore generator, 0.3 to 0.5% by weight of binder Applying a peeling liquid composition containing the remaining amount of pure water, followed by drying to form a peeling film; And forming a metal film on top of the peeling film.

In the present invention, using a low molecular weight acrylic resin, that is, a polyacrylic acid ester having a molecular weight of 2 × 10 ⁵ or less as the film forming resin composition of the filming solution composition is excellent in adhesion and rapidly cured, dried as well as conventional filming process The firing process in this way can be omitted.

The pore generators rapidly decompose by heat in the drying process of the filming film to form pores in the filming film, thereby suppressing the swelling of the aluminum film formed later, including hydrogen peroxide and the like.

The humectant prevents excessive drying of the filming film and prevents peeling of the application interface of the filming solution from the inner surface of the panel. Glycerin etc. can be used as such a compound.

The binder is not particularly limited, but potassium silicate, gum arabic, gelatin and the like are used. Potassium silicate is one of water glass, which is a thick aqueous solution of alkali silicate obtained by melting silicon dioxide and alkali. It is generally very viscous, and is used for bonding artificial stone, glass, ceramics, refractory paint, and acid resistant paint. It is used a lot as an adhesive at the time of manufacture.

Since ammonium oxalate has a needle-like crystal structure, it is located in the deposition film and sublimes at low temperature, thereby facilitating the release of gas generated when the pores are formed and baked in the deposition film, thereby preventing swelling of the aluminum film.

Hereinafter, the present invention will be described in detail with reference to specific examples, but the present invention is not limited to the following examples.

(Example 1)

0.12 kg of LUDOX is dissolved in 1200 kg of pure water, 700 g of which is added, and 60 g of ammonium oxalate [(NH ₄ ) ₂ (COO) ₂ H ₂ O], 15 g of hydrogen peroxide (H ₂ O ₂ ), C 300 ml of -72 and 25 g of glycerin were mixed to prepare a blooming liquid composition.

The black matrix layer was formed on the remaining portion of the panel except for the pixel formation region. In the pixel formation region, a phosphor composition in which a phosphor, a polymer which causes a photocuring reaction by ultraviolet light, and a photosensitive agent are spin coated, and a shadow mask is mounted, followed by ultraviolet exposure. It was developed with pure water to wash the high solubility and to form a phosphor pattern. The phosphor composition was applied to each color, and the exposure and development processes were repeated to form the color phosphor pattern.

The peeling liquid composition was applied to the inner surface of the panel on which the black matrix and the respective phosphor patterns were formed by using a spin moting method, and then dried at about 42 ° C. Next, an aluminum film was formed to form a screen.

(Comparative Example 1)

580 g of an aqueous solution of rudox was mixed and mixed with it to form a mixture of 735 g of C-72, 60 g of ammonium oxalate [(NH ₄ ) ₂ (COO) ₂ H ₂ O], and 15 g of hydrogen peroxide (H ₂ O ₂ ). It carried out by the same method as Example 1 except having used as a composition.

(Comparative Example 2)

A blooming liquid composition was prepared by mixing 250 g of an acrylic emulsion (B-74), 20 g of ammonium oxalate, 5 g of hydrogen peroxide (H ₂ O ₂ ), 12.6 g of glycerin, and 0.54 g of ammonia water.

The black matrix layer was formed on the remaining portion of the panel except for the pixel formation region. In the pixel formation region, a phosphor composition in which a phosphor, a polymer which causes a photocuring reaction by ultraviolet light, and a photosensitive agent are spin coated, and a shadow mask is mounted, followed by ultraviolet exposure. It was developed with pure water to wash the high solubility and to form a phosphor pattern. The phosphor composition was applied to each color, and the exposure and development processes were repeated to form the color phosphor pattern.

The peeling liquid composition was applied to the inner surface of the panel on which the black matrix and the phosphor phosphor pattern were formed by using a spin coating method, and then dried at about 42 ° C. to form an aluminum film. Thereafter, the film was baked at about 450 ° C. to decompose the organic material of the film to form a screen.

In the case of Comparative Example 1, it was possible to observe a phenomenon in which part of the boundary portion to which the peeling liquid composition of the panel was applied was cracked. In Comparative Example 2, the firing process of 450 ° C. after applying and drying the peeling liquid was required. On the contrary, in the case of Example 1, it was possible to obtain a film of excellent adhesion and excellent flatness without undergoing a separate firing step. As a result, it was confirmed that the brightness of the screen film according to the embodiment is improved than that of Comparative Example 1-2.

As described above, when the cathode ray tube is manufactured using the peeling liquid composition according to the present invention, the following effects may be obtained.

First, the baking process is unnecessary after applying the peeling liquid, thereby reducing manufacturing cost and time.

Second, since there is no use of flammable organic solvent, it is safe because there is no need for a separate ventilation facility and there is no problem of environmental pollution.

Third, the brightness of the screen film is improved by forming a filming film having excellent flatness.

Claims (10)

In the composition for forming a film of film forming an intermediate film for forming a metal film of the cathode ray tube film, 30 to 35% by weight of the acrylic emulsion containing an acrylic resin, 2-3% by weight of ammonium oxalate, wetting agent 2-3 Filling liquid composition for a cathode ray tube, characterized in that it comprises a pure water of the weight%, pore generator 0.7 to 0.9% by weight, binder 0.3 to 0.5% by weight and the rest of the content. The film-forming composition for cathode ray tubes according to claim 1, wherein the acrylic resin is a polyacrylic acid ester having a molecular weight of 2 × 10 ⁵ or less. The film-forming composition for cathode ray tubes according to claim 1, wherein the humectant is glycerin. The film-forming composition for cathode ray tubes according to claim 1, wherein the binder is potassium silicate, gum arabic or gelatin. The filling liquid composition for cathode ray tube according to claim 1, wherein the pore generator is hydrogen peroxide. Forming a fluorescent film on an inner surface of the panel on which the black matrix is formed; 30 to 35% by weight of an acrylic emulsion containing acrylic resin on top of the fluorescent film, 2 to 3% by weight of ammonium oxalate, 2 to 3% by weight of wetting agent, 0.7 to 0.9% by weight of pore generator, 0.3 to 0.5% by weight of binder Applying a peeling liquid composition containing the remaining amount of pure water, followed by drying to form a peeling film; And forming a metal film on the film. The method for producing a screen film according to claim 6, wherein the acrylic resin is a polyacrylic acid ester having a molecular weight of 2 × 10 ⁵ or less. The method of claim 6, wherein the humectant is glycerin. The method of claim 6, wherein the binder is potassium silicate, gum arabic or gelatin. The method of claim 6, wherein the pore generating agent is hydrogen peroxide.