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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 disk at high temperature, organic matter such as the substrate is burned, so that only gold can be recovered, and substrate resin cannot be recovered

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

Embodiment 1

[0042] Prepare 3000ml of 15wt% NaOH solution and 15wt% HNO in a beaker 3 Solution 3000ml, placed in 500mm×300mm ultrasonic water tank, ultrasonic frequency 28KHz, power 0.4W / cm 2 , control the temperature at 50°C. Put the discarded discs into the alkaline cleaning solution, soak them for a period of time, take them out and wash them, and then put them into the acid cleaning solution, put 20 discs at a time, according to the process figure 2 Perform the operations in the order shown.

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

[0044] There was no significant difference in the electron probe scanning results before and after the treatment and the pristine substrate.

Embodiment 2

[0046] The method is as in Example 1. For an aluminum film optical disc, use 10wt% NaOH solution or 10wt% KOH solution or solution HNO3 alone, under the action of ultrasonic waves and a controlled temperature of 50°C, all can be obtained within 40 minutes Qualified disc substrate. But with the acid of embodiment 1, the combined use effect of alkaline solution is the best.

Embodiment 3

[0048] The method is as in Example 1, without ultrasonic action, when the temperature is kept at about 50°C; using lye or acid alone to treat aluminum-film discs, or using acid alone to treat copper-film discs, clean substrates can be obtained, but it takes a long time Long, about 2 hours or so.

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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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