KR100582448B1 - Plasma Display Panel Bulkhead Remover Composition - Google Patents

Abstract

The present invention relates to a plasma display panel ("PDP") partition remover composition, wherein the butyldiglycol is 5-30% by weight; 5 to 40 wt% ethyldiglycol; 2 to 8% by weight potassium hydroxide; Sodium gluconate 1 to 10% by weight; 2 to 6% by weight of ethylene glycol, if necessary; And it provides the PDP dielectric layer or partition removal agent composition before baking after drying consisting of a residual amount of water.

The partition removing agent composition of the present invention has good removal efficiency and exhibits high performance not only for PbO but also for non-PbO-based partition walls without damaging an electrode layer made of a metal such as Ag.

Plasma display panel, plasma display panel, dielectric layer

Description

Plasma display panel bulkhead remover composition {composition to remove barrior rib in repairing plasma display panel}

The present invention relates to a plasma display panel ("PDP") partition remover composition. In particular, the invention relates to compositions for use in removing barrier ribs without affecting the metal conductive layer underneath the dielectric layer.

The plasma display panel ("PDP") is largely comprised of a front plate (or top plate) and a back plate (or bottom plate). For example, in the case of an AC PDP, the electrodes are arranged side by side with the sustain (x) electrode and the scan (y) pole, and on the back plate, the address electrodes are arranged at right angles to the two electrodes on the front plate, and the fluorescent film is reflective. I adopt it. First, a signal electrode is provided on the back plate, and a dielectric layer is applied thereon. In addition, a barrier rib is installed at a predetermined height to separate the discharge cells and to secure a space between the front and back plates, and then a phosphor is coated on the dielectric covering the partition and the signal electrode. Three valleys corresponding to red (r), green (g), and blue (b) applied along the partition wall form one pixel. Meanwhile, the front panel is formed of indium tin oxide (ITO) in consideration of the transmittance of the x electrode and the y electrode for maintaining the discharge, and at the edge of the electrode, a bus such as Ag or Cr-Cu-Cr is used to compensate for the high resistance of the ITO. Form an electrode. PbO or non-PbO-based dielectric layers are applied to limit current through natural capacitive formation, and a protective film such as Mgo is deposited on the surface. This dielectric layer formation results in memory characteristics, one of the main characteristics of AC PDP.

Briefly summarizing the layer structure of the AC PDP, it consists of two glass tubes of the front plate back plate, and the discharge sustaining electrode, the bus electrode, the dielectric layer, and the protective film rise on the front plate, and the address plate, the dielectric layer, and the partition wall on the back plate. Goes up. The layer structure of the DC PDP is similar to that of the insulating layer instead of the electrode and the dielectric layer, but the partition and the phosphor are similar. The panel is completed by assembling, sealing, exhausting, and gas sealing the front plate and the back plate.

In the dielectric or bulkhead forming process of PDP, the dielectric material or bulkhead paste is applied and dried at low temperature. In the case of the bulkhead, the ribs are generally formed as long as furrows by sandblasting to form the bulkhead. If there is no abnormality in the dried dielectric layer or partition wall, the firing process is carried out to a glass state. However, if the dielectric layer is bad before the firing, or if the bulkhead is broken in the form of a partition, or if there is a problem in the smoothness, it will be a defective product even if it is fired, and the expensive glass plate on which the electrode is formed should be discarded. This is a significant burden.

If the partition material can be effectively removed, the panel from which the partition material has been removed can be put back into the partition formation process. Conventionally, attempts have been made to regenerate defective PDP glass plates by removing defective partition walls or dielectric layers with a single component solvent. However, the method of removing the partition wall material or the dielectric layer by a single organic solvent takes a long time and has a problem of corrosion of the electrode layer.

Such barrier remover should have good permeability and good removal efficiency and should not damage the electrode layer made of metal such as Ag. It should also be easy to remove the dielectric layer.

The present invention is to provide a composition that can be used to remove the defective dielectric layer or partition wall material before firing having good permeability and good removal efficiency and not damaging an electrode layer made of a metal such as Ag. In addition, the present invention is to provide a barrier removal composition exhibiting high performance not only for PbO but also for non-PbO-based barrier materials. The present inventors tested various solvents and could not obtain the desired result with a single solvent. The inventors have found that the removal agent having a ratio of approximately butyl diglycol; ethyl diglycol; sodium gluconate approximately 3: 3: 1 is the best and has completed the present invention.

5 to 30% by weight of butyldiglycol according to the present invention; 5 to 40 wt% ethyldiglycol; 2 to 8% by weight potassium hydroxide; Sodium gluconate 1 to 10% by weight; 2 to 6% by weight of ethylene glycol, if necessary; And a barrier removal composition comprising a residual amount of water. Preferably 7 to 25% by weight of butyldiglycol; 7-30 wt% ethyldiglycol; 3 to 6 weight percent of potassium hydroxide; Sodium gluconate 1 to 7 wt%; Ethylene glycol 3 to 5% by weight.

The barrier material and the dielectric layer material are composed of metal oxide frit glass powder, more specifically PbO, B2O3, SiO2, ZnO, SnO2 based amorphous glass mixture, and Al2O3, TiO2 to control the bonding strength and thermal expansion coefficient. , PbTiO3 and the like can be added. The partition material and the dielectric layer material are not particularly limited and may be appropriately selected and used.

The partition material or the dielectric material is prepared in a paste form by mixing an acrylate-based binder and a solvent with the frit glass. After the paste is applied to a glass substrate and dried, the solvent is blown off and the shape is fixed by a binder. The bulkhead remover needs a good penetrating solvent to melt the binder holding the frit powder in a short time.

KOH is preferably used 3 to 6% by weight to prevent corrosion of metal electrodes such as Ag.

The bulkhead remover composition removes the following four substances in the PDP manufacturing process:

One). Bulkhead Structure (Sandblasting Completed Bulkhead)

2). Bulkheads in uncoated state (non-sandblasted, ie rib-free bulkhead layers)

3) .Dielectric layer

4) .Removable non-Pb bulkheads (ZnO bulkheads) as well as the above PbO bulkheads.

 The removal efficiency (at room temperature) should be within 8 seconds to 15 seconds for 1), 2 minutes for 2), 50 seconds for 3) and 4 minutes for 5).

 Hereinafter, the present invention will be described in detail with reference to Examples.

Specimen Manufacturing

250 nm on a glass plate specimen (3 cm * 2 cm) in which an Ag electrode layer was formed using a dielectric paste transfer paper made of an inorganic particle mixture of 60 wt% lead oxide + 20 wt% boron oxide + 20 wt% silicon oxide and an acrylate binder and a plasticizer. A large number of specimens of type B are prepared by coating with a thickness and drying (150 ° C.).

The B-type specimen was calcined at 400 ° C. and coated with a partition wall material having a thickness of 500 nm using a partition paper transfer paper made of lead oxide, boron oxide, silicon oxide, alumina-based inorganic particles, a binder, and a plasticizer, followed by drying. (150 ° C.) A specimen of type C was prepared. A portion of the C-type specimen is masked with an aluminum foil having a 1 mm groove and then sand-blasted to make an A-type specimen having a partition wall.

D-type specimens are prepared in the same manner as the preparation of the C-type specimens, except that inorganic particles of zinc oxide + silicon oxide + boron oxide are used.

Application of remover

 The specimen was fixed vertically on the board and the chemical liquid was sprayed with a small atomizer to measure the time for the dielectric layer and the partition wall to flow down.

Comparative example  1-15

Methanol was sprayed on the prepared A, B, C and D specimens and the removal time was measured. In the same way, the removal time was measured with various single solvents and the results are summarized in Table 1.

Table 1

 Drug name Processing result removal time (sec) TYPE A TYPE B (dielectric) TYPE C (Pb bulkhead) TYPE D (Zn bulkhead) Comparative Example 1 METHANOL 15 113 554 698 Comparative Example 2 ETHANOL 12 125 598 745 Comparative Example 3 ETHYLENE GLYCOL MONOBUTYL ETHER 45 200 541 698 Comparative Example 4 TETRA HYDRO FURAN 12 225 314 387 Comparative Example 5 DIACETONA ALCOHOL 23 212 361 446 Comparative Example 6 DMSO 30 312 334 412 Comparative Example 7 NMP 25 320 323 398 Comparative Example 8 AMMONIUM ACETATE 18 225 365 462 Comparative Example 9 1,1,2,2 TETRA CHLORO ETHANE 21 207 335 435 Comparative Example 10 N-OCTHYL ACETATE 45 262 451 512 Comparative Example 11 MONO CHLORO BENZEN 30 225 321 421 Comparative Example 12 O-CHLOROBENZEN 25 362 387 324 Comparative Example 13 BDG 45 260 641 812 Comparative Example 14 EDG 24 187 637 786 Comparative Example 15 KOH 40 367 473 584

Example  1-19

20% by weight of butyldiglycol ("BDG") + 20% by weight of ethyl diglycol ("EDG") + 5% by weight of potassium hydride and the remaining amount of water in the prepared A, B, C and D specimens Spray and remove time was measured. In the same way, the removal time was measured with various complex solvents and the results are summarized in Table 2.

Table 2

 Drug name Processing result removal time (sec) TYPE A TYPE B (dielectric) TYPE C (Pb bulkhead) TYPE D (Zn bulkhead) Example 1 BDG (20%) + EDG (20%) + KOH (5%) 13 72 208 257 2 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (1%) 11 63 160 198 3 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 11 52 135 167 4 BDG (5%) + EDG (5%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 30 72 289 278 5 BDG (10%) + EDG (10%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 18 67 178 215 6 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 11 52 135 167 7 BDG (30%) + EDG (30%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 17 59 166 197 8 BDG (20%) + EDG (5%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 34 71 195 268 9 BDG (20%) + EDG (10%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 21 68 176 226 10 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 11 52 135 167 11 BDG (20%) + EDG (30%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 19 55 152 196 12 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 11 52 135 167 13 BDG (20%) + EDG (20%) + KOH (10%) + Sodium Gluconate (1%) + EG (4%) 10 52 146 159 14 BDG (20%) + EDG (20%) + KOH (15%) + Sodium Gluconate (1%) + EG (4%) 15 56 178 175 15 BDG (20%) + EDG (20%) + KOH (20%) + Sodium Gluconate (1%) + EG (4%) 17 55 182 194 16 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (1%) + EG (4%) 11 52 135 167 17 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (5%) + EG (4%) 11 52 134 167 18 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (7%) + EG (4%) 12 52 135 167 19 BDG (20%) + EDG (20%) + KOH (5%) + Sodium Gluconate (10%) + EG (4%) 11 52 134 168

Test results of 10 to 20% by weight of butyldiglycol; 10-30 wt% ethyldiglycol; 5 to 10 weight percent potassium hydroxide; Sodium gluconate 1 to 10% by weight; It was best when 3 to 5% by weight of ethylene glycol and the remaining amount of water were used. In Comparative Examples 1 to 15 where no alkali was used, corrosion of the metal electrode layer was observed.

The partition removing agent composition of the present invention has good removal efficiency and exhibits high performance not only for PbO but also for non-PbO-based partition walls without damaging an electrode layer made of a metal such as Ag.

Claims (2)

5 to 30 wt% butyldiglycol; 5 to 40 wt% ethyldiglycol; 2 to 8% by weight potassium hydroxide; Sodium gluconate 1 to 10% by weight; 2 to 6% by weight of ethylene glycol, if necessary; And a PDP dielectric layer or barrier rib removal composition before firing after drying, which comprises residual water. The method of claim 1, wherein the butyl diglycol 7 to 25% by weight; 7-30 wt% ethyldiglycol; 3 to 6 weight percent of potassium hydroxide; Sodium gluconate 1 to 7 wt%; Ethylene glycol 3 to 5% by weight PDP dielectric layer or barrier rib removal composition.