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Method of recovering organic record dye during light record medium producing process

An optical recording medium and organic technology, applied in the direction of organic dyes, azo dyes, chemical instruments and methods, etc., can solve the problems of pollution prevention and control in the optical recording media industry, and achieve the effect of reducing the amount of use

Inactive Publication Date: 2004-11-24
IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to solve the problem of pollution prevention and control in the optical recording media industry, and realize the resource recovery of high-value organic recording dyes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 500 ml of the edge-washing solution of waste optical recording dyes produced in the cyanine-based CD-R process, put it into a beaker, and then evaporate and remove the edge-washing solvent at 35° C. under reduced pressure and vacuum. The evaporated edge washing solvent can be condensed and recovered separately, and then used in the process after distillation and purification. After concentration under reduced pressure, 4 g of solid were obtained. Put the 4 grams of solid in a container, add 20 ml of HPLC grade acetone solvent, and continue shaking the container with a horizontal shaker at a vibration frequency of 180 rpm for 15 hours. At this time, the solid is completely dispersed, and the impurities therein are dissolved in acetone in solvent. Then, the shaken mixture was filtered with filter paper. The solid on the filter paper was washed again with 5 ml of HPLC grade acetone solvent, the washed solid was collected, and 1.6 g of solid was obtained after drying...

Embodiment 2

[0036] Take 500 ml of the waste optical recording dye edging solution produced by the phthalocyanine dye-based CD-R process and put it in a beaker, and then evaporate and remove the edging solvent at 35° C. under reduced pressure and vacuum. After concentration under reduced pressure, 4.66 g of dark green solid was obtained. Put the 4.66 g of solid in a beaker, add 100 ml of ethyl acetate solvent, and heat at 90° C. for 24 hours to dissolve. Filter it with filter paper while it is hot, and let the filtrate stand at room temperature for 24 hours, and a solid precipitates out. The solid and liquid were separated by filter paper, and the obtained solid was dried at 60° C. for 18 hours to obtain 2.46 g of a green solid. The green solid was dissolved again at 90° C. with 6 ml of ethyl acetate, followed by the addition of 12 ml of isopropyl ether, and the solid was recrystallized at room temperature for 18 hours. After filtering again and washing the recrystallized solid on the fi...

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Abstract

The present invention is recovering and purifying process of waste record dye during light record medium production. The said recovering and purifying process includes volatilizing solvent in the washing solution to obtain concentrate, and washing the concentrate with one kind of solvent to eliminate impurity or dissolving the concentrate in solvent and re-crystallizing the dissolved record dye. The said process can obtain pure record dye with photoelectronic performance according with the use specification.

Description

technical field [0001] The main raw materials of the optical recording medium manufacturing process are polycarbonate resin (Polycarbonate, PC for short) as the base material, recording dyes and organic solvents. The invention is aimed at recovering and purifying the waste recording dyes produced in the edge washing process of the optical recording medium manufacturing process, so as to return to the manufacturing process for reuse, reduce the waste of raw materials, and improve competitiveness. Background technique [0002] Taiwan's CD-R production accounts for more than 85% of the world's total. In 2002, the global CD-R disc shipments reached 6,328 million pieces. The manufacture of CD-R includes injection molding (Injection Molding), dye coating (Dye Coating), spray plating (Sputtering) and other main manufacturing procedures, and finally bonding (Bonding) on ​​a protective transparent plate. The DVD-R is only different from the CD-R in the bonding...

Claims

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Application Information

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IPC IPC(8): B09B3/00C09B47/04
Inventor 吕庆慧王心心赖庆智张蕙兰
Owner IND TECH RES INST
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