Process for reclaiming polycarbonate substrate from abandoned optical discs

A technology of discarded optical discs and polycarbonate, which is applied in the field of recycling polycarbonate substrates, can solve the problems of harmful and unrecyclable substrate resins, and achieve the effect of solving environmental pollution

Inactive Publication Date: 2003-12-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reflective film, although a solution can be used to dissolve it, only extremely harmful aqua regia can be used.
Also, by treating the entire

Method used

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  • Process for reclaiming polycarbonate substrate from abandoned optical discs
  • Process for reclaiming polycarbonate substrate from abandoned optical discs
  • Process for reclaiming polycarbonate substrate from abandoned optical discs

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] Prepare 3000ml of 15wt% NaOH solution and 15wt% HNO in a beaker. 3 3000ml solution, placed in a 500mm×300mm ultrasonic water tank, ultrasonic frequency 28KHz, power 0.4W / cm 2 , Control the temperature at 50℃. Put the discarded discs in the alkaline cleaning solution, soak them for a period of time, remove them for washing, and then put them in the acid cleaning solution, set 20 discs each time, follow the process figure 2 Perform operations in the order shown.

[0043] Results: The apparently qualified optical disc substrates were obtained in 9 batches of experiments, and the qualified rate was greater than 95%; no significant change was observed in the solution reactivity. Before treatment, the average weight of each piece: 15.028g, and the average weight of each piece after treatment: 14.899g.

[0044] There is no obvious difference between the electronic probe scanning results before and after processing and the original substrate.

Example Embodiment

[0045] Example 2

[0046] The method is the same as in Example 1. For aluminum film discs, 10wt% NaOH solution or 10wt% KOH solution or solution HNO3 are used alone, under the action of ultrasound and under the condition of controlling the temperature of 50℃, it can be obtained within 40 minutes. Qualified optical disc substrate. However, the combination of the acid and alkali solutions of Example 1 has the best effect.

Example Embodiment

[0047] Example 3

[0048] The method is the same as in Example 1. There is no ultrasonic effect, when the temperature is maintained at about 50°C; when the aluminum film disc is treated with lye or acid solution alone, or the copper film disc is treated with acid solution alone, a clean substrate can be obtained, but it takes longer Long, about 2 hours.

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Abstract

The present invention belongs to the waste CD processing technology and is especially method of recovering polycarbonate chip from waste CD. Waste CD is set inside cleaning acid or alkali solution and under the action of high temperature and/or ultrasonic wave, the UV protecting film is crushed and separated from metal film and the metal film dissolves in cleaning acid or alkali solution so as to obtain the CD chip. The said acid or alkali solution has concentration over 1 wt%. The said process has no pollutant exhausted while recovering resource.

Description

technical field [0001] The invention belongs to the processing technology for waste optical discs, in particular to a method for recovering polycarbonate substrates from waste optical discs. Background technique [0002] China produces hundreds of thousands of tons of optical discs every year. Although the weight is not large, its area is large. The tiled area of ​​100,000 tons of optical discs is about 96 square kilometers. With the development of the information industry and the advancement of waste sorting and recycling management, it is increasingly necessary to deal with waste optical discs. As far as Shenzhen is concerned, there are more than 400 tons of anti-pornography and anti-illegal products and private products every year. [0003] Discarded discs are easy to cause environmental pollution. Landfill---difficult to degrade, polluting soil and water resources. Although the weight of the metal on the optical disk only accounts for about 0....

Claims

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Application Information

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IPC IPC(8): B29B17/00C23F4/00
CPCY02W30/62
Inventor 郭占成卢维昌王春福赵蕴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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