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Lead-free medium slurry and manufacturing method thereof

A lead-free medium and medium paste technology, applied in the field of lead-free medium paste and its manufacturing, can solve the problems of inability to use sealing, large thermal expansion coefficient of glass, deviation of bright colors, etc., to improve brightness and reduce energy consumption. , the effect of protecting the electrode

Inactive Publication Date: 2010-11-24
SICHUAN COC DISPLAY DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Japanese patent application JP 2-267137 of Hitachi Manufacturing Co., Ltd. discloses a vanadium oxide-based sealing glass with a sealing temperature of less than 400°C and a thermal expansion coefficient of 90×10 -7 / °C, but lead oxide is an essential component in this glass, which cannot meet the requirements of lead-free; US Patent US 5153151 discloses a phosphate sealing glass with a glass transition point of 340°C and a thermal expansion coefficient of (TEC) is 135-180×10 -7 / °C, the disadvantage of this glass is that it is very toxic, and the thermal expansion coefficient of the glass is relatively large, so it cannot be used for sealing with medium and low expansion coefficients
At present, a variety of lead-free dielectric pastes have been researched in China, such as the lead-free paste for electrode coating disclosed in Chinese patent ZL200310110339.9 and Chinese patent application publication CN101157519A, although it meets lead-free, certain softening point and thermal expansion coefficient requirements, but the reflectivity is low, and the brightness of the plasma display screen made of this backplane medium is low, and the color vividness is biased

Method used

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  • Lead-free medium slurry and manufacturing method thereof

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preparation example Construction

[0021] 1. Preparation of lead-free glass powder

[0022] Put various inorganic materials into the mixing tank according to a certain proportion, mix evenly and pour into Al 2 o 3 The crucible is kept in a solid-phase sintering furnace at 1100°C-1300°C for 1 hour to obtain uniform glass liquid. The glass liquid passes through a glass flaker to obtain glass fragments. After these glass fragments are coarsely powdered, they are ball-milled with a ball mill to obtain ultra-fine particles. The glass powder has a particle size of 3-5 μm, so that the required lead-free glass powder is obtained.

[0023] 2. Preparation of backplane medium slurry

[0024] Mix the above-mentioned lead-free glass powder and coloring agent uniformly in a certain proportion, add an organic carrier, mix evenly, and then pass through a three-roll rolling mill to disperse the inorganic powder evenly in the organic carrier, thus obtaining the required covering electrode. Backplane media slurry.

[0025] 3....

Embodiment 1

[0028] The composition ratio of lead-free glass powder is shown in Table 1. Prepare lead-free glass powder according to this formula, and then add TiO according to the weight ratio of lead-free glass powder and colorant 93:7 2 , mix evenly, add the organic vehicle prepared by EC 10wt%, BCA 20wt%, TE 40wt%, Texanol 30wt%, so that the solid content of the final lead-free medium slurry is 79%, after three-roll rolling mill Use a fineness meter to scrape the fineness below 5 μm, and the viscosity test is 18 Pa·s, so far the required backplane medium slurry is obtained.

[0029] Use a 325-mesh screen to print the above slurry on a 15cm×25cm glass, heat it at 150°C for 15 minutes, then keep it in a muffle furnace at 350°C for 20 minutes to completely remove the organic components in the paste, and finally heat it at 560°C Cool down after 20 minutes of sintering.

Embodiment 2

[0031] The composition ratio of the lead-free glass powder is shown in Table 1 below. Prepare lead-free glass powder according to this formula, and then add TiO according to the weight ratio of lead-free glass powder and colorant 72:28 2 , mix evenly, add the organic vehicle prepared by EC 10wt%, BCA 20wt%, TE 40wt%, Texanol 30wt%, the solid content of the final lead-free medium slurry is 79%, finely The scraping fineness of the meter is below 5 μm, and the viscosity test is 21 Pa·s. So far, the required backplane medium slurry has been obtained.

[0032] Use a 325-mesh screen to print the above slurry on a 15cm×25cm glass, heat it at 150°C for 15 minutes, then keep it in a muffle furnace at 350°C for 20 minutes to completely remove the organic components in the paste, and finally heat it at 560°C Cool down after 20 minutes of sintering.

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Abstract

The invention provides a method for preparing medium slurry. The method comprises the following steps of: fully mixing lead-free glass powder and a colorant in certain ratio; and then mixing the mixture and an inorganic carrier to prepare the lead-free medium slurry. The invention also provides a lead-free medium slurry which consists of the lead-free glass powder, the colorant and the organic carrier; and the reflectivity of the obtained lead-free slurry can reach over 65 percent (550nm).

Description

technical field [0001] The present invention relates to a method for preparing a lead-free dielectric slurry and the lead-free dielectric slurry produced according to the method, in particular to a lead-free dielectric slurry composed of lead-free glass powder, a colorant and an organic carrier and its Production method. Background technique [0002] A plasma display (PDP) is a flat panel display that utilizes a gas discharge phenomenon to produce a visual display. The PDP display screen consists of a front panel, a back panel and many microstructures on it. In order to realize fine image display function, multiple groups of electrodes are formed on the back panel, and these electrodes are processed into thin wires. In order to realize the independent control of each pixel, an insulating layer is formed on it to ensure the insulation between each group of electrodes. This insulating layer also plays the role of protecting the electrodes and storing charge to reduce the dis...

Claims

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Application Information

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IPC IPC(8): C03C8/24
Inventor 商红凯薛道齐李海燕
Owner SICHUAN COC DISPLAY DEVICES
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