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Method of producing green fluorescent powder

A green fluorescent powder and fluorescent powder technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of skirt aluminum film bubbles, aluminum film bubbles, increase phosphor skirt residue, etc., to achieve increased skirt residual effect

Inactive Publication Date: 2009-02-18
CAIHONG GRP ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly aims at the problem of aluminum film bubbles or aluminum film flanging due to the small residual skirt of green fluorescent powder used in the prior art, and provides a preparation method of green fluorescent powder. The green fluorescent powder obtained by the preparation method of the present invention Phosphor powder can increase the skirt residue of phosphor powder and solve the problem of aluminum film bubbles or aluminum film flanging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: First, wash the fired green phosphor powder in a stainless steel tank with pure water to remove impurities in the phosphor powder; secondly, mix the washed phosphor powder with dispersing balls, pure water, and dispersant at 300r / min , Disperse for 1 to 8 hours, wherein the mass ratio of phosphor to dispersing ball and pure water is 5:4:6, the dispersant uses 3.05 modulus potassium silicate with a mass concentration of 25%, and the dosage of dispersant is 4ml / kg phosphor ; Then, add 15ml / kg phosphor powder into a silicon dioxide solution with a mass concentration of 30% in a stainless steel tank, stir for 10-15 minutes, and then add 18ml / kg phosphor powder with a molar concentration of 0.7mol / l of zinc sulfate solution, stirred for 10-15 minutes; then added 13ml of silicon dioxide per kilogram of fluorescent powder and stirred for 15-25 minutes for coating treatment; the silicon dioxide is a transparent colloid, and the pH of the colloid is 3, the particle d...

Embodiment 2

[0009] Example 2: First, wash the fired green phosphor powder in a stainless steel tank with pure water to remove impurities in the phosphor powder; secondly, mix the washed phosphor powder with dispersing balls, pure water, and dispersant at 500r / min , Disperse for 1 to 8 hours, wherein the mass ratio of fluorescent powder to dispersing balls and pure water is 5:4:6, the dispersant uses 3.9 modulus potassium silicate solution with a mass concentration of 28%, and the dosage of dispersant is 2ml / kg fluorescent powder; then, add 40ml / kg fluorescent powder to the silicon dioxide solution with a mass concentration of 26% in the stainless steel tank, stir for 10-15min, and then add 26ml / kg fluorescent powder with a molar concentration of 0.7mol / l of zinc sulfate solution, stirring for 10-15 minutes; then adding 30ml of silicon dioxide per kilogram of fluorescent powder and stirring for 15-25 minutes for coating treatment; the silicon dioxide is a transparent colloidal solution, an...

Embodiment 3

[0010] Example 3: First, wash the fired green phosphor powder in a stainless steel tank with pure water to remove impurities in the phosphor powder; secondly, mix the washed phosphor powder with dispersing balls, pure water, and dispersant at 700r / min , Disperse for 1 to 8 hours, wherein the mass ratio of fluorescent powder to dispersing balls and pure water is 5:4:6, the dispersant uses 3.05 modulus potassium silicate with a mass concentration of 25%, and the dosage of dispersant is 5ml / kg fluorescent powder ; Then, add 5ml / kg phosphor powder into a silicon dioxide solution with a mass concentration of 20% in a stainless steel tank, stir for 10 to 15 minutes, and then add 12ml / kg phosphor powder with a molar concentration of 0.7mol / l of zinc sulfate solution, stirred for 10-15 minutes; then added 26ml of silicon dioxide per kilogram of fluorescent powder and stirred for 15-25 minutes for coating treatment; the silicon dioxide is a transparent colloid, and the pH of the colloi...

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Abstract

The invention provides a method for preparing green emitting phosphor. In the method, burnt green emitting phosphor is cleaned; after the burnt green emitting phosphor is dispersed, the surface of the green emitting phosphor is treated; silicon dioxide is added to the surface treated phosphor powder; the mixture of the phosphor powder and the silicon dioxide is coated; the processed phosphor powder is dehydrated and dried; the dried phosphor powder is screened. The cathode-ray tube used green emitting phosphor can increase the residue of the phosphor powder at the skirt, which is effective for controlling cathode-ray tube aluminium backing bubbles or turned-up edges.

Description

Technical field: [0001] The invention relates to a method for preparing fluorescent powder for color picture tubes and displays, in particular to a method for preparing green fluorescent powder for cathode ray tubes. Background technique [0002] The green phosphor powder used in cathode ray tubes is now commonly used in the production process including washing, dispersing, surface treatment, dehydration, drying, and powder screening for the fired phosphor powder. Some phosphor powders are produced after surface treatment, and now The dehydration in the production of phosphor powder is generally carried out by a dehydrator using the principle of centrifugal force. These production processes can produce phosphor powder suitable for cathode ray tubes, but the existing production technology has certain shortcomings, because the fluorescence The dispersant used for powder dispersion is general-purpose polycarboxylate sodium salt. At the same time, the surface treatment of the ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02
Inventor 李伟苟宝峰
Owner CAIHONG GRP ELECTRONICS CO LTD
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