KR101053240B1 - Ceramic composite composition for partition wall of plasma display panel including hollow pearlite - Google Patents

Abstract

The present disclosure discloses a ceramic composite composition for partition walls of a plasma display panel including hollow pearlite, and the ceramic composite composition includes bismuth oxide (Bi ₂ O ₃ ), zinc oxide (ZnO), boron oxide (B ₂ O ₃ ), and oxidation An oxide selected from the group consisting of phosphorus (P ₂ O ₅ ), barium oxide (BaO), silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), tin oxide (SnO, SnO ₂ ), and combinations thereof 70 wt% or more but less than 100 wt% of the parent glass comprising; And hollow pearlite greater than 0 wt% to 30 wt% or less, and the barrier rib of the plasma display panel having low dielectric constant and excellent mechanical properties may be manufactured by including the hollow pearlite.

Plasma Display Panel Bulkhead, Hollow Pearlite

Description

Ceramic composite composition for bulkhead of plasma display panel including hollow pearlite {CERAMIC COMPOSITE COMPOSITION CONTAINING HOLLOW PERLITE FOR BARRIER RIB OF PLASMA DISPLAY PANEL}

The present invention relates to a ceramic composite composition for partition walls of a plasma display panel including hollow pearlite, and more particularly, by adding hollow perlite as a filler to an oxide-based mother glass, it has a low dielectric constant and excellent mechanical properties. Eggplant relates to a ceramic composite composition capable of producing partition walls of plasma display panels.

Plasma display panels (PDPs) are in the spotlight as next-generation display devices along with TFT liquid crystal display (LCD), organic EL, and FED. In the PDP device, ultraviolet rays generated during the discharge of a gas such as He + Xe, Ne + Xe, etc. in a discharge cell isolated by a barrier rib excite red, green, and blue phosphors, and the phosphors are in a ground state when the phosphors are excited. It is a display element that uses the phenomenon of light emission due to the energy difference when returning to. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development.

Among the components of the display device of the PDP, the partition wall on the rear substrate is important for forming discharge cells coated with red (R), green (G), and blue (B) phosphors, determining pixels, and preventing inter-pixel mixing. Play a role. The required characteristics of the partition wall include the compactness and high strength (breaking toughness) of the partition wall, the coefficient of thermal expansion similar to that of substrate glass, high light reflectance, high aspect ratio, and low dielectric constant.

In recent years, research on bulkheads has been actively conducted in three aspects.

First, PbO-based glass used in the case of the Republic of Korea Patent Application Publication No. 10-2002-0077551 and the existing bulkhead is replaced with lead-free glass. In the early days of PDP, bulkhead materials are mainly PbO-B ₂ O ₃ -SiO ₂ lead borate glass, which is applied to environmental regulations with an excess of 60-80% by weight of PbO. In other words, electronic products containing PbO-containing materials have been used since 2006 and 2007, respectively, for RoHS (Restricting the use of hazardous substance) and WEEE (Waste electrical and electronic equipment) disposal. Directives will regulate the use of hazardous substances. For this reason, the development of lead-free glass compositions is urgent and many studies have been made.

Second is the study of the reactivity of fillers, pigments and mother glass added to improve the thermal, mechanical and functional properties of bulkheads. Many researches have been made on the existing fillers suitable for the PbO-based glass composition and are currently commercialized, but development of a suitable filler is required according to the development of lead-free glass compositions.

Third, as in the case of Korean Patent Laid-Open Publication No. 2004-0010987, it is an improvement of a manufacturing method related to pattern formation of partition walls. In order to increase luminous efficiency, which is one of the disadvantages of PDP, various methods have been proposed in relation to the size of pitch cells in terms of cell shape and high definition. In the conventional sandblasting technique, various techniques have been studied to form high-definition barrier ribs in the existing sandblasting technique. However, the biggest alternatives are the formation of barrier ribs using an etching technique and photosensitive barrier ribs capable of forming patterns on their own. The bulkhead forming method includes a sandblasting method, a photosensitive paste method, and a chemical etching method. Currently, a sandblasting method, a chemical etching method, and a photosensitive paste method are all used.

1 illustrates a basic cell structure and a power consumption calculation formula of a plasma display panel. It is known that the dielectric constant of each member including the partition wall of the plasma display panel is related to the power consumption and signal propagation delay time, and various attempts have been made to lower the dielectric constant of the partition material.

Japanese Laid-Open Patent Publication No. 2003-45342 discloses lowering the dielectric constant by introducing pores into a partition wall by including a spherical silica-based filler powder. There is a problem that it is difficult to form a partition. Therefore, there is a need for the development of a PDP barrier material that simultaneously satisfies two conflicting conditions of low dielectric constant and high strength.

The present invention has been made to solve the above-described problems, to provide a ceramic composite composition for the manufacture of the partition wall of the plasma display panel having a low dielectric constant and excellent mechanical properties.

In order to achieve the above object, according to the present invention, bismuth oxide (Bi ₂ O ₃ ), zinc oxide (ZnO), boron oxide (B ₂ O ₃ ), phosphorus oxide (P ₂ O ₅ ), barium oxide (BaO), 70% by weight or more to less than 100% by weight of the base glass including an oxide selected from the group consisting of silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), tin oxide (SnO, SnO ₂ ), and combinations thereof; And more than 0% to 30% by weight of hollow pearlite is provided a ceramic composite composition for partition walls of the plasma display panel.

The ceramic composite composition according to the present invention may include hollow pearlite as a filler to introduce pores into the plasma display panel partition wall to reduce dielectric constant and coefficient of thermal expansion.

In addition, since the hollow pearlite can maintain its shape even in the ceramic composite after sintering, it is possible to maintain the strength as the PDP partition wall by supporting the hollow outer structure of the hollow pearlite.

Therefore, it is possible to manufacture a plasma display panel partition wall having a low dielectric constant and a high strength by using the ceramic composite composition according to the present application, and thus it is possible to reduce power consumption and signal propagation delay time of the plasma display panel.

Hereinafter, specific details for carrying out the ceramic composite composition for partition walls of the plasma display panel according to the present application will be described.

However, the following description is not intended to limit the present invention to specific embodiments, and it should be understood that the present invention covers all the transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

The present invention relates to a ceramic composite composition for partition walls of plasma display panels, and more particularly, bismuth oxide (Bi ₂ O ₃ ), zinc oxide (ZnO), boron oxide (B ₂ O ₃ ), phosphorus oxide (P ₂ O ₅ ), a base glass comprising an oxide selected from the group consisting of barium oxide (BaO), silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), tin oxide (SnO, SnO ₂ ), and combinations thereof At least 100 wt.%; And more than 0 wt% to 30 wt% of hollow pearlite.

Here, the mother glass may be used as a component for forming the mother glass of the plasma display panel partition wall, and various conventional oxide-based mixtures suitable for plasma display panel partition walls may be used, for example, may be conventional glass frit. have. However, it is more preferable to use an oxide-based mixture which does not contain lead components and which can reduce the weight of the product and which is capable of low temperature firing for application to soda-lime glass substrates.

According to one embodiment of the present invention, the mother glass is bismuth oxide (Bi ₂ O ₃ ), zinc oxide-boron oxide (ZnO-B ₂ O ₃ ), zinc oxide-silicon oxide (ZnO-SiO ₂ ) , Zinc oxide-boron oxide-silicon oxide (ZnO-B ₂ O ₃ -SiO ₂ ), boron oxide-zinc oxide-phosphorus oxide (B ₂ O ₃ -ZnO-P ₂ O ₅ ), zinc oxide-boron oxide -Silicon oxide-aluminum oxide (ZnO-B ₂ O ₃ -SiO ₂ -Al ₂ O ₃ ), bismuth oxide-silicon oxide (Bi ₂ O ₃ -SiO ₂ ), bismuth oxide-boron oxide-silicon oxide ( Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ ), bismuth oxide-boron oxide-silicon oxide (Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ ), bismuth oxide-boron oxide-silicon oxide-aluminum oxide (Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ -Al ₂ O ₃ ), bismuth oxide-zinc oxide-boron oxide-silicon oxide system (Bi ₂ O ₃ -ZnO-B ₂ O ₃ -SiO ₂ ), oxidation bismuth-aluminum oxide-based _{(Bi 2 O 3 -ZnO-B} 2 O 3 -SiO 2 -Al 2 O 3), zinc oxide-zinc oxide-silicon oxide-boron oxide, boron oxide - aluminum oxide - silicon oxide - Based _{(ZnO-B 2 O 3 -Al} 2 O 3 -SiO 2 -P 2 O 5) and zinc oxide-barium oxide-boron oxide-bismuth oxide-silicon oxide-aluminum oxide-phosphorus-oxide (ZnO-BaO-B ₂ O ₃ -Bi ₂ O ₃ -SiO ₂ -Al ₂ O ₃ -P ₂ O ₅ ) It may be one or more oxide-based mixture selected from the group consisting of, but is not limited thereto.

In addition, according to another embodiment of the present invention, the mother glass is sodium oxide (Na ₂ O), lithium oxide (Li ₂ O), potassium oxide (K ₂ O), manganese oxide (MgO), calcium oxide (CaO) , Strontium oxide (SrO), titanium oxide (TiO ₂ ), cobalt oxide (CoO, Co ₂ O ₃ ), vanadium oxide (V ₂ O ₅ ) and copper oxide (CuO) may also further include one or more metal oxides selected from the group consisting of, but is not limited thereto and includes additional other components. can do.

The hollow pearlite refers to a hollow expanded pearlite prepared by pulverizing and expanding perlite, which is a type of siliceous volcanic rock. 2 is an SEM image of the hollow pearlite (FIG. 2 (a) high magnification, (b) low magnification).

The hollow pearlite may serve as a filler and may lower the dielectric constant of the partition wall by forming pores in the plasma display panel partition wall manufactured by sintering the ceramic composite composition of the present invention. In addition, since the hollow pearlite can maintain the hollow shape (ie, the outer structure and the internal pores) even after sintering (see FIG. 3), the hollow outer structure can play a supporting role to simply form pores. Compared with this, the decrease in strength can be relatively reduced.

According to one embodiment of the present invention, the average particle size of the hollow pearlite may be 1 to 30 μm, preferably in the range of 1 to 2 μm. If it is out of the above range, it may be inappropriate as a filler that provides the effect of forming internal pores and maintaining strength of the plasma display panel partition wall.

The hollow pearlite may be included in an amount of more than 0 wt% to 30 wt% in the ceramic composite composition for partition wall of the plasma display panel of the present invention. If it is more than 30% by weight, it may be difficult to obtain strength as a partition.

According to one embodiment of the present invention, the hollow pearlite may be included in the composite composition 5 to 30% by weight, more preferably 10 to 20% by weight, wherein the effect of reducing the dielectric constant and the appropriate strength Can be obtained at the same time.

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

Glass Frit  And Hollow Pearlite  Ready

As a glass frit having a low Tg and a suitable coefficient of thermal expansion (CTE) suitable for manufacturing PDP partition walls, a glass frit having a composition of B ₂ O ₃ -ZnO-P ₂ O ₅ and having properties shown in Table 1 below was prepared.

T _g T _dsp CTE Dielectric constant d ₅₀ 478 ℃ 484 ℃ 80.4 X 10 ^-7 / ℃ 9.06 4.17

The hollow perlite as shown in Table 2 below was prepared by pulverizing and expanding the perlite (raw perlite). Hollow pearlite was manufactured by Korea Institute of Energy Research and its raw materials are pearlite (SiO ₂ 71.3wt%, Al ₂ O ₃ 13.4 wt%, TiO ₂ 0.87 wt%, Fe ₂ O ₃ 4.54 wt%, CaO 3.09 wt %, MgO 0.90 wt%, Na ₂ O 0.21 wt%, K ₂ O 0.10 wt%, etc.) by selecting the pulverized, expanded to prepare a hollow pearlite.

d50 Volume density Thermal conductivity 30 μm 0.08-0.13 g / cm ³ 0.038 ~ 0.043 kcal / mh ℃

Glass Frit  And Hollow Pearlite  Mixed and Pellet  Produce

The glass frit and hollow pearlite were mixed for 24 hours in a weight ratio as shown in Table 3 below using a tubular mixer.

No. One 2 3 4 5 Glass frit 100 95 90 80 70 Hollow pearlite 0 5 10 20 30

Each of the mixed composition was put into a mold and pressed for 90 seconds with a force of about 1 ton / cm ² by hand press to prepare a pellet in the form of a disk.

Property measurement

The upper and lower parts of the pellet were polished to measure the dielectric constant, and the results are shown in the graph of FIG. 4. The pellets were cut into rectangular shapes to measure the coefficient of thermal expansion (CTE), and the results are shown in the graph of FIG. 5. After the pellets were calcined at 550 ° C. for 30 minutes, Vickers hardness was measured, and the results are shown in the graph of FIG. 6. Each measurement method used a method commonly used in the art to which the present invention belongs, and a detailed description thereof will be omitted.

4 and 5, the coefficient of thermal expansion and dielectric constant was found to decrease as the content of hollow pearlite constituting the pores increases. Referring to FIG. 6, it can be seen that the Vickers hardness decreases as the content of hollow pearlite increases, but the decrease is less than the case of simply forming pores.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

1 is a cross-sectional view showing a basic cell structure of a plasma display panel.

2 is an SEM image of hollow pearlite.

Figure 3 is an SEM image showing the hollow pearlite maintaining the form in the ceramic composite according to an embodiment of the present invention.

Figure 4 is a graph showing the result of measuring the dielectric constant in accordance with an embodiment of the present invention.

5 is a graph showing a thermal expansion coefficient measurement results according to an embodiment of the present invention.

6 is a graph showing a Vickers hardness measurement results according to an embodiment of the present invention.

Claims (5)

Bismuth oxide (Bi ₂ O ₃ ), zinc oxide (ZnO), boron oxide (B ₂ O ₃ ), phosphorus oxide (P ₂ O ₅ ), barium oxide (BaO), silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), tin oxide (SnO, SnO ₂ ), and at least 70 wt% to less than 100 wt% of the matrix glass including an oxide selected from the group consisting of a combination thereof; And Hollow pearlite greater than 0% to 30% by weight Comprising a ceramic composite composition for the partition wall of the plasma display panel. The method of claim 1, The mother glass is bismuth oxide (Bi ₂ O ₃ ), zinc oxide-boron oxide (ZnO-B ₂ O ₃ ), zinc oxide-silicon oxide (ZnO-SiO ₂ ), zinc oxide-boron oxide-silicon oxide Subsystem (ZnO-B ₂ O ₃ -SiO ₂ ), Boron Oxide-Zinc Oxide-Phosphorus Oxide (B ₂ O ₃ -ZnO-P ₂ O ₅ ), Zinc Oxide-Boron Oxide-Silicon Oxide-Aluminum Oxide (ZnO- B ₂ O ₃ -SiO ₂ -Al ₂ O ₃ ), bismuth oxide-silicon oxide (Bi ₂ O ₃ -SiO ₂ ), bismuth oxide-boron oxide-silicon oxide (Bi ₂ O ₃ -B ₂ O _3- SiO ₂ ), bismuth oxide-boron oxide-silicon oxide based (Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ ), bismuth oxide-boron oxide-silicon oxide-aluminum oxide based (Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ -Al ₂ O ₃ ), bismuth oxide-zinc oxide-boron oxide-silicon oxide (Bi ₂ O ₃ -ZnO-B ₂ O ₃ -SiO ₂ ), bismuth oxide-zinc oxide-boron oxide-oxidation Silicon-aluminum oxide (Bi ₂ O ₃ -ZnO-B ₂ O ₃ -SiO ₂ -Al ₂ O ₃ ), zinc oxide-boron oxide-aluminum oxide-silicon oxide-phosphorus oxide (ZnO-B ₂ O ₃ -Al ₂ O ₃ -SiO ₂ -P ₂ O ₅ ) Or zinc oxide-barium oxide-boron oxide-bismuth oxide-silicon oxide-aluminum oxide-phosphorus oxide (ZnO-BaO-B ₂ O ₃ -Bi ₂ O ₃ -SiO ₂ -Al ₂ O ₃ -P ₂ O ₅ ) Phosphorus, ceramic composite composition for partition walls of plasma display panels. The method of claim 1, The mother glass is sodium oxide (Na ₂ O), lithium oxide (Li ₂ O), potassium oxide (K ₂ O), manganese oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), titanium oxide (TiO) ₂ ), cobalt oxide (CoO, Co ₂ O ₃ ), vanadium oxide (V ₂ O ₅ ), copper oxide (CuO) and a metal oxide selected from the group consisting of a combination thereof further comprising a ceramic composite composition for a partition of the plasma display panel. The method of claim 1, The hollow pearlite is a hollow pearlite in which pearlite is expanded, and has an average particle size of 1 to 30 μm, the ceramic composite composition for partition walls of plasma display panels. The method of claim 1, The hollow pearlite maintains the hollow form even after sintering the ceramic composite composition to provide pores in the partition walls of the plasma display panel manufactured by sintering the ceramic composite composition. Composition.

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