KR20000034870A - A filming solution for CRT and the method for fabricating filming layer - Google Patents

Abstract

PURPOSE: A filming solution of a color cathode ray tube is provided to perform a process simply and safely. CONSTITUTION: A filming solution of a color cathode ray tube comprises an emersion and an addition. The emersion comprises a butyl methacrylate over 70 wt%, and is obtained by copolymers with a mono polymer. The mono polymer comprises one selected from a group of an acrylic acid induce substance, a methcrylic acid induce substance, a sthylene, acrylamaid, and acrylolate. The acrylic acid induce substance comprises acrylic acid, methacrylic acid, methyl methacrylate, ethyl acrylate, and benzyl acrylate, and the methcrylic acid induce substance comprising methacrylic acid, methyl methacrylate, ethyl methacrylate, hydracyethyl methacrylate, isobonyl methacrylate, benzyl methacrylate, and penocy methacrylate.

Description

Filming solution for color CRT and method for forming film using same {A filming solution for CRT and the method for fabricating filming layer}

The present invention relates to a peeling liquid used for forming a film of a color brown tube (Cathode Ray Tube: CRT), in particular an additional baking process using an acrylic emulsion containing at least 70 wt% of butyl methacrylate. There is no need for this, and it is related with the blooming liquid which can carry out a process safely and simply.

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 with red, green, and blue phosphor stripes does not form a flat surface due to phosphor holes in the stripe, if aluminum wool is deposited directly on the aluminum, the phosphors It penetrates and reduces the effect of the aluminum film as a mirror.

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, in order to vacuum-deposit aluminum on the organic film formed by this filming and then completely dissipate unnecessary organic substances, a firing process must be performed. 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.

However, in the conventional method of using an aqueous acrylic emulsion, a polyvinyl alcohol, an acrylic emulsion, glycerin, ammonium hydroxide, hydrogen peroxide, etc. is added and used, but in this case, after the aluminum film is formed, the fluorescent film is used. In order to decompose the organic material of the film and the film, the firing is performed at a temperature range of 400 to 450 ° C., but the frit sealing process is then performed again at a temperature range of 400 to 450 ° C. for the combination of a panel and a funnel. As a result, the film has the disadvantage of being subjected to double firing. 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.

In addition, 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 the process is complicated, such as the need for a separate facility.

Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, in forming the film film which is an intermediate film of the color-brown tube fluorescent film, it can be performed more safely and simply than the oil-based lacquer, of course, It is an object of the present invention to provide an acrylic emulsion that does not require a firing process and a blooming solution using the same.

In order to realize the above object, the present invention is water-based acrylic pyrolysis start temperature (5 wt% loss point) is 200-220 ℃, pyrolysis completion temperature (95 wt% loss point) is 300-320 ℃ and the residual carbon ratio is less than 1.0% An emulsion, a method of forming a filming solution and a filming film using the same, are provided.

Emulsion copolymerized with other monomers copolymerizable with butyl methacrylate, which is used as a main component of the blooming solution in the present invention, has a decomposition initiation temperature of 200 ° C., which is decomposed at about 100 ° C. lower than a conventional acrylic emulsion. It is started, and since the residual carbon ratio in 400-450 degreeC is 0.65% and 0.4%, respectively, removal is easy. Therefore, the filming film manufactured using the filming solution containing the emulsion of the present invention can omit the baking step performed after the formation of the metal film.

The emulsion of the present invention contains at least 70 wt% of butyl methacrylate, acrylic acid derivatives such as acrylic acid, ethyl acrylate, benzyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate. Methacrylic acid derivatives such as methacrylate, hydroxyethyl methacrylate, isobornyl methacrylate, benzyl methacrylate, phenoxy methacrylate and at least one selected from styrene, acrylamide and acrylonitrile Obtained by copolymerization with a monomer.

At this time, sodium dodecylsulfosuccinate, an anionic surfactant, may be used as the surfactant.

In addition, the blooming liquid of this invention is obtained by adding 1 or more types of additives, such as a polyvinyl alcohol, hydrogen peroxide, surfactant, and an antifoamer, to the copolymer emulsion containing 70 wt% or more of butyl methacrylates.

Herein, the content of the electro-copolymer emulsion is preferably 4-40 wt% based on the total amount of the blooming solution in the amount of solids.

In addition, in the present invention, a conventionally used thickener such as G-110 (product name of Rohm and Haas) may be added as a viscosity change stabilizer due to freezing and alteration of acrylic emulsion.

On the other hand, when the filming solution of the present invention is applied onto the fluorescent film and the aluminum film is deposited, ammonium oxalate can be sprayed to prevent swelling of the aluminum film.

Hereinafter, the configuration of the present invention will be described in more detail with reference to preferred embodiments, which illustrate the present invention, the present invention is not limited only to these examples.

Example 1

480 g of butyl methacrylate, 8 g of hydroxyethyl methacrylate, 8 g of acrylic acid, 650 g of pure water, and 4 g of sodium dodecylsulfosuccinate (trade name: Triton GR-5M) were mixed together, and then, as a polymerization initiator, 1 15 g of wt% potassium persulfonate was added and reacted at 75 ° C to obtain a 30 wt% butyl methacrylate emulsion in a yield of 98%.

Thermal analysis of the obtained emulsion showed that the 5 wt% and 95 wt% loss points were 220 ° C. and 340 ° C., respectively. Moreover, xanthan coal at 450 degreeC was 1.0 wt%.

Example 2

480 g of butyl methacrylate, 4 g of hydroxyethyl methacrylate, 4 g of acrylic acid, 650 g of pure water, and 4 g of sodium dodecylsulfosuccinate were mixed together, and then 15 g of 1 wt% potassium potassium persulfonate as a polymerization initiator. Was added and reacted at 75 ° C. to obtain a 30 wt% butyl methacrylate emulsion in a yield of 98%.

Thermal analysis of the obtained emulsion showed that the 5 wt% and 95 wt% loss points were 220 ° C. and 320 ° C., respectively. Moreover, xanthan coal at 450 degreeC was 0.4 wt%.

Comparative Example 1

55 g of methyl methacrylate (MMA), 40 g of ethyl acrylate (EA), 5 g of methyl methacrylic acid (MMC), 300 g of pure water, and 4 g of sodium dodecylsulfosuccinate were mixed together, followed by polymerization initiator. 3 g of 1 wt% potassium persulfonate was added and reacted at 75 ° C. to obtain 25 wt% of a conventional emulsion in 95% yield.

Thermal analysis of the obtained emulsion showed that the 5 wt% and 95 wt% loss points were 205 ° C. and 430 ° C., respectively. Moreover, the xanthan coal at 450 degreeC was 3 wt%.

Example 3

Emulsion polymer of which the composition ratio of butyl methacrylate (BMA), hydroxyethyl methacrylate (HEMA), methacrylic acid (MAA) and acrylic acid (AA) is BMA: HEMA: MAA: AA = 120: 1: 1: 1 After mixing 4 wt%, 0.4 wt% of polyvinyl alcohol, and 0.2 wt% of hydrogen peroxide solution with pure water and stirring, the pH was adjusted to 7.0 using ammonia water to obtain 1000 g of the blooming solution of the present invention.

The obtained peeling liquid was spun onto the fluorescent film layer and dried, and then an aluminum film was deposited. After baking this at 450 degreeC through the sealing process, as a result of measuring the brightness | luminance, the brightness | luminance of 80% of the conventional peeling liquid of the comparative example 2 mentioned later was shown.

Example 4

Butyl methacrylate, hydroxyethyl methacrylate and acrylic acid in which the composition ratio of BMA: HEMA: AA = 120: 1: 1 is mixed with 9 wt% of emulsion polymer, 0.4 wt% of polyvinyl alcohol and 0.2 wt% of hydrogen peroxide with pure water. After stirring, the pH was adjusted to 7.0 using ammonia water to obtain 1000 g of the blooming solution of the present invention.

The obtained peeling liquid was spun onto the fluorescent film layer, dried, and sprayed with ammonium oxalate, followed by vapor deposition of an aluminum film. After baking this at 450 degreeC through the sealing process, as a result of measuring the brightness | luminance, the brightness | luminance of 102% compared with the conventional filming liquid of the comparative example 2 mentioned later was shown.

Example 5

Butyl methacrylate, hydroxyethyl methacrylate and acrylic acid composition ratio of BMA: HEMA: AA = 120: 1: 1 emulsion polymer 10 wt%, polyvinyl alcohol 0.4 wt%, hydrogen peroxide 0.2 wt%, polymerization carboxyl After stirring and stirring 0.07 wt% of sodium salt polymeric carboxylic axid (trade name of Rohm and Haas, Ortan 731-SD) with pure water, the pH was adjusted to 7.0 using ammonia water to adjust the pH of the present solution 1000 g was obtained.

The obtained peeling liquid was spun onto the fluorescent film layer, dried, and sprayed with ammonium oxalate, followed by vapor deposition of an aluminum film. After baking this at 450 degreeC through the sealing process, as a result of measuring the brightness | luminance, the brightness | luminance of 105% compared with the conventional peeling liquid of the comparative example 2 mentioned later was shown.

Example 6

15 wt% of an emulsion polymer having a composition ratio of butyl methacrylate, isobornyl methacrylate (IM) and acrylic acid (AA), BMA: IM: AA = 120: 1: 1, 0.4 wt% polyvinyl alcohol, 0.2 wt% hydrogen peroxide % Was mixed with pure water and stirred, and the pH was adjusted to 7.0 using ammonia water to obtain 1000 g of the blooming solution of the present invention.

The obtained peeling liquid was spun onto the fluorescent film layer, dried, and sprayed with ammonium oxalate, followed by vapor deposition of an aluminum film. After baking this at 450 degreeC through the sealing process, as a result of measuring the brightness | luminance, the brightness | luminance of 107% compared with the conventional peeling liquid of the comparative example 2 mentioned later was shown.

Comparative Example 2

15 wt%, 0.4 wt%, 0.3 wt%, 0.3 wt% of B 74 (product name of Rohm and Haas), polyvinyl alcohol, hydrogen peroxide and glycerin were respectively mixed with pure water, and the pH was adjusted to 7.0 with ammonia water. 1000 g of a peeling liquid was obtained.

The obtained peeling liquid was applied over the fluorescent film layer, dried, and an aluminum film was deposited. This was calcined at 450 ° C., and further calcined at 450 ° C. through the sealing step, and then luminance was measured. The resultant at this time was 100%, and the blooming liquid of the present invention was compared with the luminance.

Example 7

Add 15 wt% of butyl methacrylate and 84 wt% of pure water, and add 0.5 wt% of SDS (sodium dodecyl sulfate) as a surfactant and 0.5 wt% of potassium forsium sulfate (K ₂ S ₂ O ₈ ) as a polymerization initiator. After stirring for 10 minutes by rotating stirring at 60 ℃ slowly for 4 hours to prepare a 1000g acrylic crab emulsion. 0.5 wt%, 0.3 wt%, 1.5 wt%, 0.03 wt% of polyvinyl alcohol, hydrogen peroxide, glycerin, and ammonium oxalate were respectively added as additives, and pH was adjusted to 7 with ammonium hydroxide to obtain 1023 g of a blooming solution. This was applied over the fluorescent film layer and an aluminum film was deposited. This was calcined at 450 ° C. through a sealing step and then PL (photoluminescence) was measured. The PL value measured at this time was 202%.

Example 8

0.5 wt% sodium dodecyl sulfate as a surfactant in 12 wt% butyl methacrylate, 3 wt% methacrylic acid, and 84 wt% pure water and 0.5 wt% potassium forsium persulfate (K ₂ S ₂ O ₈ ) as a polymerization initiator The reaction mixture was stirred for 10 minutes at 4000 rpm, and then reacted for 4 hours while slowly rotating at 60 ° C. to prepare 1000 g of the emulsion of the present invention. Polyvinyl alcohol, hydrogen peroxide, glycerin, and ammonium oxalate were added as additives to each of 0.5 23%, 0.3 wt%, 1.5 wt%, and 0.03 wt%, respectively. g was obtained.

The obtained peeling liquid was applied over the fluorescent film layer, and an aluminum film was deposited. This was calcined at 450 ° C. through a sealing step, and then PL (photoluminescence) was measured. The PL value measured at this time was 210%.

Comparative Example 3

B 74, polyvinyl alcohol, hydrogen peroxide, glycerin, ammonium oxalate and ammonium hydroxide were mixed with 15 wt%, 0.5 wt%, 0.3 wt%, 1.5 wt% and 0.03 wt% of pure water and the pH was adjusted to 7 with ammonium hydroxide. It adjusted to and the conventional blooming liquid was obtained.

The obtained peeling liquid was applied over the fluorescent film layer, and an aluminum film was deposited. This was calcined at 450 ° C. through a sealing step, and then PL was measured to obtain 190% of the result.

As can be seen through the configuration described above, the present invention in forming a film film, which is an intermediate film of the color-brown tube fluorescent film, there is no risk of solvent, which is a problem of the oil-based lacquer, and is scattered in the change of temperature and humidity It is possible to carry out the process more safely and simply by using an acrylic emulsion containing 70% or more of butyl methacrylate having low pyrolysis temperature and low xanthan in the less water-based polymer. It is possible to omit an additional firing step to reduce the process time.

Claims (11)

A color-browning film peeling liquid containing at least 70 wt% of butyl methacrylate and an emulsion copolymerized with at least one monomer copolymerizable therewith and at least one additive. The method of claim 1, wherein the monomer is an acrylic acid derivative such as acrylic acid, ethyl acrylate, benzyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, hydroxyethyl methacrylate, isobornyl methacrylate, A methacrylic acid derivative, such as benzyl methacrylate and phenoxy methacrylate, and a pill, acrylamide and acrylonitrile. The peeling liquid of the color-brown tube according to claim 1 or 2, wherein the content of the electrical emulsion is 4-40 wt% based on the total amount of the blooming liquid. The coloring tube peeling liquid according to claim 1, wherein the electrical additive is selected from polyvinyl alcohol, hydrogen peroxide, a surfactant, an antifoaming agent, and the like. The peeling liquid of a color-brown tube according to claim 1 or 2, wherein butyl methacrylate and methacrylic acid are copolymerized. The color liquid tube blooming liquid according to claim 1, further comprising a thickener. 70 wt% or more of butyl methacrylate; acrylic acid derivatives such as acrylic acid, ethyl acrylate, benzyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, hydroxyethyl methacrylate, isobutyl meta Emulsions copolymerized with methacrylic acid derivatives such as acrylate, benzyl methacrylate and phenoxy methacrylate and at least one selected from styrene, acrylamide and acrylonitrile. 8. The emulsion according to claim 7, which contains 0.1 to 20 wt% of hydroxyethyl methacrylate and 0.1 to 10 wt% of acrylic acid. 8. The emulsion according to claim 7, further comprising sodium dodecylsulfosuccinate as a surfactant. A peeling film forming method for color-brown tubes, characterized by spraying a small amount of ammonium oxalate solution after applying a peeling liquid containing 70 wt% or more of butyl methacrylate to the upper portion of the fluorescent film layer. The method of claim 10, wherein after spraying the ammonium oxalate solution, the film is decomposed and removed in a subsequent frit sealing process without a separate firing step.