TW200536878A - Method for recycling polycarbonate plastic from discarded mixed compact disc - Google Patents

Abstract

Provided is one kind of means of recycling discarded hybrid compact discs. Slowly add calcium hypochlorite solution to the broken discard mixed compact discs and adjust the pH value to 3 to 5 by adding acetic acid, which will produce a great deal of activated oxygen and hypochlorous acid to oxidize the dyes and metals like silver, aluminum on the surface layer of the compact discs. Filter and remove the liquid after reaction, add acetic acid solution with heating at a high temperature to make the plastic film of the surface layer be peeled off or dissolved. When the compact discs become transparent, the purpose of recycling polycarbonate plastics can be achieved.

Description

200536878 V. Description of the invention (1) ^ _ [Technical field to which the invention belongs] The present invention uses the strong oxidizing power of hypochlorous acid to oxidize the metal on the surface of the optical disc and the reflective layer. The principle of acetic acid, from waste Hua 纟 # Η φ 骖 boat can be processed. 4 [Previous technology] Recycling of discarded polycarbonate discs from previous discs [Previous technology] Known disposal methods of discarded discs can only recover single layers. The main processing methods can be divided into two methods: planing and solvent methods: using steel wire or The high-speed grinding of the splattered metal layer of the waste disc by the grinding wheel will cause contamination of the powder of the metal ore layer. The sheet is immersed in i 5% or more of the nitriding unloading solution and V is broken. ~ 7th generation and the peeling time is 15 seconds to 15 minutes, the metal layer on the second disc can be peeled off, and then more than 70% of B_ $ This material is the first layer, and the valuable gold B contained in the potassium nitride solution / Then ^ = recover by j volume de-staining. Grapevine uses chemical method / electrolysis method [Inventive content] In the past, DVD was made of double-layer polycarbonate plastic

Membrane and dye inclusions have not been able to effectively handle "Mingjian ^ there are plastic discs discarded, and slowly add secondary gas jealousy ^ Ming will break the dye on the layer a and metals such as silver, osmium, and so on. = First disc > The characteristic corrosion that can be dissolved in an acetic acid aqueous solution at high temperature, β, the shape of plastic is used to achieve recovery of polycarbonate plastic σ various optical discs i Optical discs are exempt from the cost of classification. Purpose while handling all kinds of shoulders

200536878 V. Description of the invention (2) [Embodiment] Various types of discarded mixed optical discs (including CD-R, VCD, DVD, etc.) are crushed and poured into the reactor, and then slowly add more than 10% of available chlorine Calcium hypochlorite solution, and add acetic acid to adjust pΗ to 3 ~ 4. After a period of reaction, add the discarded discs after filtering out the water to the acetic acid solution and a small amount of surfactant (such as dishwashing liquid), stir and control the temperature At 8 (TC-100 ° C), after the plastic film on the surface layer of the discarded mixed optical disc is peeled or dissolved, the optical disc is filtered and separated, washed with water, and dried and bagged.

Page 6 200536878 Schematic description

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Claims (1)

• 200536878 1. A method for recycling polycarbonate plastic from discarded hybrid optical discs. The optical discs disclosed in the present invention include CD-R, VCD, DVD and other long-time | discs, a process for applying for a patent, The steps are as follows: Temple various types of A · Crushing: put the disc in the crusher and crush. B. Calcium hypooxygenate oxidation: Pour the broken disc into the reactor containing the calcium hypochlorite solution, and control the pH in the reactor < 6. 'C · Filter dry: Remove water and sediment. D. Acetic acid solution: Pour the broken disc into the reactor containing the acetic acid solution and heat it at high temperature until the adhesive film peels or dissolves. E. Separation · The transition separates the disc from the acetic acid solution. F · Cleaning: Wash the transparent disc 2 to 3 times with clean water. G · Dry: Use a drying device to remove water. Page 8 200536878 VI. Designated Representative Map (I) The representative map in this case is: Figure ________ (II) The component representative symbols of the representative map in this case are simply explained: ΙΗΒ Page 3 200536878 Brief description of the drawings A. Crushing: Crush the disc in a crusher. B. Calcium Oxygenate Oxidation: Pour the broken disc into the reactor containing the calcium acid solution, and control the pH < 6 in the reactor. C. Filter dry ... Remove water and sediment. D. Soak acetic acid solution: Pour the broken disc into the reactor containing the acetic acid solution and heat at high temperature until the film peels or dissolves. E. Separation: Filter to separate the disc from the acetic acid solution. F. Cleaning: Rinse the transparent disc 2 to 3 times with water. G. Drying: Use a drying device to remove water. Page 7