KR20000033226A - Filming solution for forming a filming film of a color cathode ray tube - Google Patents

Abstract

PURPOSE: A filming solution for forming a filming film of a color cathode ray tube is provided to increase a brightness by improving a low leveling and a crack of the filming layer. CONSTITUTION: A filming solution for forming a filming film of a color cathode ray tube comprises as a spot increasing material a hydrophilic polymer(RM-8W) of a low molecular weight which is surrounded by a hydrophobic property group. In order to obtain the filming solution(60), first, 38% acrylic emersion 24g, 1% AOS 2g, 4% RM-8W 1g and 2% poly vinyle alcohol 14g are mixed with a pure water 21g at 60°C, and then pH of the mixed material is adjusted so as to have 6.9 to 7.5 by use of 38% ammonia water.

Description

Filming solution for forming film film of color CRT

The present invention relates to a peeling liquid used to form a film of a cathode ray tube (CRT), particularly a hydrophilic low molecular weight polymer surrounded by a hydrophobic group to improve cracking and low flatness of the film. It is related with the blooming liquid which can improve the.

In general, a fluorescent film of a color cathode ray tube converts electron beam energy emitted from an electron gun into light energy, and realizes an image by excitation emission of a phosphor, and a black matrix forming process and a green, blue and red fluorescent pattern forming process. Is made.

The fluorescent film thus formed improves the luminance of the fluorescent film, prevents the potential drop of the fluorescent film, and prevents burning of the fluorescent surface due to ion bombardment, thereby evaporating and diffusing aluminum under vacuum to form a thin aluminum film.

However, since the phosphor film formed with the G, B, and R phosphor stripes does not form a flat surface due to the phosphor holes in the stripe, when aluminum wool is deposited directly, aluminum penetrates the phosphor and reduces the effect of the aluminum film as a mirror. Let's go.

Therefore, in general, in the color cathode ray tube, in order to prevent such a phenomenon, a special coating material for blocking the holes between the phosphors is coated on the phosphor film. That is, after the phosphor layer is applied to the inner surface of the panel, a film is applied to form an intermediate film to smooth the deposition of aluminum, to reduce the unevenness of the aluminum film caused by the holes between the phosphors, and to increase the reflection efficiency of the aluminum film to improve luminance. To make it possible.

Since such an interlayer film must be made of a material that does not adversely affect the phosphor and does not interfere with electron emission of the electron gun, it is formed into a thermally decomposable organic film, and the process of forming the organic film is called filming.

In addition, aluminum is vacuum-deposited on the organic film formed by this filming, and then a firing process is required to completely dissipate unnecessary organic substances. In this firing process, the aluminum-attached fluorescent surface is heated to 350-450 ° C.

Conventional techniques for forming such filming films are roughly divided into two methods using aqueous acrylic emulsions and oil based lacquers.

In the case of using an oil-based laca, there is a low organic matter and does not require a separate firing, but there is a risk of explosion of the solvent, and there is a complicated process such as the need for a separate facility.

In addition, in the method of using an aqueous acrylic emulsion, polyvinyl alcohol, an acrylic emulsion, glycerin, ammonium hydroxide, hydrogen peroxide, etc. are added and used. In this case, after the aluminum film is formed, firing is performed at a temperature in the range of 400-450 ° C. to decompose the organic material of the fluorescent film and the film, but then again 400-450 for the combination of the panel and the funnel. Since there is a process of frit sealing in the temperature range of ° C, the film is eventually double baked. On the other hand, if there is no separate firing process, since decomposition of the filming film organic matter is late, organic decomposition gas remains at the softening point of the frit and the crystallization temperature of 400-450 ° C., thus preventing the frit sealing.

On the other hand, since organic matter is thermally decomposed, gasified, and released into the atmosphere, bulging or peeling occurs when the film does not have proper processability, and when such swelling occurs, reflection of light from the fluorescent surface becomes uneven and causes a decrease in luminance. .

Moreover, in order to act as a reflecting surface of high reflectance with respect to the emitted light of a fluorescent substance, it is necessary to be flatter, and the film | membrane film which becomes an intermediate film of an aluminum reflecting film and a fluorescent film must be formed more flatly besides having the said suitable workability.

Therefore, in order to obtain such a film of film having the opposite properties, conventionally, a method of coating a fluorescent surface as an aqueous emulsion of an acrylic resin (emulsion) and heating and drying is used.

However, the film film formed using the thermally decomposable acrylic emulsion (Rom & Haas company name: B-74) as a main component in the conventional filming solution, and using G-110 (Rom & Haas company name) as the thickener is the thickener used. Is a water-soluble polymer that forms strong linkages with surrounding water molecules in solution, thereby increasing the volume of water-soluble components in a constant volume, causing aggregation of pigments or binders (see FIG. 3), resulting in cracking on the surface after drying. Occurs and is very rough and has a poor flatness depending on the shape of the fluorescent film. 1 shows a structure of such a conventional film.

In the drawings, reference numeral 2 denotes a panel, 4 denotes a black matrix, 6 denotes a filming film, and 8 denotes an aluminum deposited film. As shown in FIG. 1, if the surface of the film 6 is rough and the leveling is not good, the aluminum deposition film 8 is also very rough and the flatness is not good, resulting in a small amount of specular reflection of light and a decrease in luminance.

Accordingly, an object of the present invention is to provide a filming solution capable of improving luminance by improving cracking and low flatness of a filming film, which is an intermediate film of a color brown tube fluorescent film, to solve the conventional problems as described above. have.

In order to realize the above object, the present invention provides an acrylic emulsion blooming liquid containing a hydrophilic low molecular weight polymer thickener.

The blooming liquid of this invention uses an acrylic emulsion (Rom & Haas company name: B-74) as a main component, and is characterized by including a hydrophilic low molecular weight polymer as a thickener.

Here, as the hydrophilic low molecular weight polymer, RM-8W (Rom and Haas Corporation) is used, and the content thereof is preferably 0.01 to 40 wt% based on the total amount of the blooming solution.

In the present invention, the hydrophilic low molecular weight polymer (Rom and Haas Co., Ltd .: RM-8W) surrounded by a hydrophobic group added as a thickener is adsorbed to particles and binders because it does not have strong association with surrounding water molecules. It has good fluidity when applied to the film. Therefore, when the polymer is added to the filming solution, it is possible to improve brightness by improving cracking and low flatness, which are disadvantages of the conventional film.

1 is a structural diagram of a conventional film film.

2 is a structural diagram of a film forming film formed using the film solution according to the present invention.

3 is a functional diagram showing the action of the conventional filming solution.

4 is a functional diagram showing the action of the blooming liquid of the present invention.

Explanation of symbols on the main parts of the drawings

2: panel 4: black matrix

6: film film 8: aluminum film

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 2 is a structural diagram of the film forming film formed using the film solution of the present invention, and FIG. 4 is a diagram showing the action of the film solution of the present invention.

Example 1 (Conventional Peeling Liquid)

24 g of 38% acrylic emulsion (Rom & Haas company name: RM-8W) 2 g of pure water, 2 g of 1% AOS (ammonium oxalate solution), 1 g of 4% G-110 (trade name of Rohm and Haas company), 14 g of 2% PVA (polyvinyl alcohol) was mixed, stirred at 60 ° C, and the pH was adjusted to 6.9-7.5 with 38% ammonia water to obtain a blooming liquid.

Example 2 (pilling liquid of the present invention)

24 g of 38% acrylic emulsion (Rom & Haas company name: RM-8W) 2 g of pure water, 2 g of 1% AOS (ammonium oxalate solution), 1 g of 4% RM-8W (trade name of Rohm and Haas company), 14 g of 2% PVA (polyvinyl alcohol) was mixed, stirred at 60 ° C, and the pH was adjusted to 6.9-7.5 with 38% ammonia water to obtain a blooming liquid of the present invention.

Example 3

The peeling liquids obtained in Examples 1 and 2 were applied to the fluorescent film for 10 seconds at 150 rpm by spin coating, dried, and inspected. The results are shown in the following [Table 1].

TABLE 1

Blooming liquid Crack Flatness after aluminum deposition Example 1 many Dot-shaped aluminum film Example 2 little Flat aluminum film

As can be seen from Table 1 and FIG. 2, the film forming film 60 formed by using a hydrophilic low molecular weight polymer (Rom and Haas Corporation name: RM-8W) surrounded by a hydrophobic group of the present invention is conventional. It was found that cracking and flatness, which were problems, were improved. In addition, the flatness of the aluminum film 80 can be improved thereby.

As can be seen through the configuration described above, the present invention is to form a filming film, which is an intermediate film of the color-brown tube fluorescent film, in particular, using a hydrophilic low-molecular weight polymer surrounded by a hydrophobic group cracking and low flatness of the film It is possible to improve the brightness by improving.

Claims (3)

An acrylic emulsion peeling liquid for forming a film of a color brown tube, wherein the film includes a hydrophilic low molecular weight polymer RM-8W surrounded by a hydrophobic group as a thickener. 2. The composition of claim 1 comprising pure water, 38% acrylic emulsion (Rom & Haas Corporation name: RM-8W), 1% ammonium oxalate solution, 4% RM-8W, 2% polyvinyl alcohol and 38% ammonia water. A peeling liquid for forming a filming film of a color brown tube. The peeling liquid for forming a peeling film of a color brown tube according to claim 1 or 2, wherein the content of the RM-8W is 0.01 to 40 wt% based on the total amount of the peeling liquid.