TWI267406B - Method for recycling a compact disk - Google Patents

Abstract

A method for recycling a compact disk [CD] comprises the steps of: breaking the CD into broken CD pieces; immersing the broken CD pieces into a strong acid solution for removing a label layer, a metal reflector layer, and a recording layer of the broken CD pieces; cleaning the broke; CD pieces with water; immersing the broken CD pieces into a strong base solution for removing a spacer layer of the broken CD pieces; cleaning the broken CD pieces with water; drying the broken CD pieces and recycling plastic and metal materials of the broken CD pieces.

Description

1267406 V. INSTRUCTION DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an optical disc recycling-strong acid solution for oxidizing to remove a disc>m is about a label layer' and then by a strong alkali solution. = recovery of polycarbonate, metal reflective layer and optical disc in the polycarbonate plastic base:, waste = disc recycling and reuse methods. The layer of the shot layer is the light of the y knife. [Prior Art] The disc (Compact Disk · γγιί ^ ^ storage medium, 纟 has a high mark), = light energy for recording and reading, long life, small size, carrier And two "big", small noise, make === ringing, etc., its use is quite extensive, can be moved to X-rays, graphics, video, sound, video and what - two only become music, movies, 'The consumer of consumer goods, the game becomes: €|) The main storage medium for computer greetings. As shown in Figure 1, the conventional I @土世u self-use early layer first disc [1] 1 (such as CD-R, Erming plastic substrate 11, sequential plating - photoreactive dye layer 12 (Ph〇t 〇reactive —dye layep〕, a metal reflective layer 13 ^ ref U = t 1 ve 1 ayer] and a label layer 14 , the transparent plastic substrate 丄 _ is selected from a polycarbonate plastic (p〇丨Yc subscribes to b〇nate, pc] to protect the dye layer 12 and the metal reflective layer 13; the photoreactive dye layer 12 is used for burning data of the X-ray disc burner; the composition of the metal reflective layer 丨3 is optional From the metal such as silver, chrome and copper alloy; the label layer 14 can be selected from UV ink, and the pattern is printed on the disc by screen or lithography. As shown in Fig. 2, the conventional single-layer disc is used. [2] 2 (for example, dcd 1267406 '5, invention description (2), etc.) sequentially consists of a label layer 2 1 , a first plastic substrate 2 2 , a first reflective layer 23 (reflective layer) and a The first photoreactive dye layer '24 (photoreactive-dye layer), the label layer η can be selected from υγ ink, screen or flat printing Printing the pattern on the optical disc; the first plastic substrate 22 is preferably selected from a polycarbonate plastic (PC) to protect the first metal reflective layer 23 and the first dye layer 24; The composition of a metal reflective layer 23 may be selected from metals such as gold, silver, aluminum, chrome alloys and steel alloys, and the first photoreactive dye layer 24 is used to allow the optical disc burner to burn data; such as 1 and 2 As shown in the figure, the standard label layer 14 and 2 1 can be printed on the surface of the polycarbonate plastic substrate 11 or the first metal reflective layer 23. As shown in Fig. 3, the double layer is conventionally used. The arrangement relationship between the layers of the optical disc 2' (such as a DVD, etc.) is from the top to the bottom of the label layer 21, a first plastic substrate 22, a winter g metal reflective layer 23, a first dye layer 24, and a a spacer layer 25, an SS-based reflective layer 23', a second dye layer 24', and a second plastic substrate 22'. The spacer layer 25 is selected from a plastic film, and the spacer layer 25 is The first plastic substrate 22 is interposed between the first metal reflective layer 23 and the first dye layer 24, and the spacer layer 25 and the second plastic substrate 22' are interposed therebetween. The gold layer is a reflective layer 23' and a second dye layer 24'; the label layer 2 is further provided on the outer stomach surface of the first plastic substrate 22. The label layer 2 1 and the first plastic substrate 2 2 The material and characteristics of a metal reflective layer 23 and the first dye layer 24 are as described in the single layer DVD of FIG. 2 and the second metal reflective layer 23', the second dye layer 24' and the spacer layer 25 It is selected from semi-translucent materials, and then burns data on the first dye layer 24 and the second dye layer 2 4 ' using lasers of different wavelengths.

1267406

In order to consider the data storage and dye layer uniformity, the metal reflective layer and the transparent disc can be used according to the service life of the metal reflective optical disc, and the recycling layer, the label layer and the recycling method can be divided into steel wire or grinding wheel pair. The waste metal reflective layer and the dye are used to discard the discs, which are easy to cause powder contamination, and the other words, if the discs are discarded, the discs are mixed and discarded in the disc production - therefore the metal reflective layer is 5 and the plastic substrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The operation process is only suitable for recycling Χ3Χ3 early layer, § discarding the disc) The layer of the disc is still increasing the processing cost. The density and the storage period are closely attached to the plastic substrate layer and the dye layer to avoid it. Oxygen The discs can be used for plastic substrates. Therefore, if you want to go back to 5, you must separate the plastic substrate. 0 The metal reflective layer and the label layer of the two optical discs are removed. However, the problem of recycling the discs is discarded. Moreover, the method rapidly processes and recovers the double sheets and mixes the single layer and the double-disc sheets to be classified by the actual method, because the discs of the discs are thinned and then the disc fragments are contained therein. The crusher is pulverized into crushed and mixed, and the stripping agent may be selected from the soaking tank of the weight percentage agent and the potassium solution, and the temperature is controlled to be cyanide for one minute of 50 to 7 〇t and above, so that the stripping agent is borrowed. From the disc fragments: between 15 seconds and 15 metal reflective layers, gp can peel the disc; the plastic substrate is peeled off from the plastic substrate, and then immersed in the ethanol on the crucible by a weight percentage of 7 / a reflective layer. minute

(S 1267406 V. INSTRUCTIONS (4) ^ ^~ --~ To dissolve and remove the dye layer, and dissolve it in the potassium cyanide solution and then recycle it by chemical method/electrolysis. Be heavy gold • Although, the above use Solvent method for recovering waste optical discs, and also separating the metal reflective layer and the metal component of the plastic substrate and the reflective layer of the discarded optical disc at the double-layer optical disc. The plastic substrate is recovered by the lack of 2 The high tightness between the metal reflective layer and the metal reflective layer requires _ by = bubble time to allow the release agent to penetrate the plastic substrate and the metal reflection ^ ^ = reverse = achieve the peeling effect, if the scrap of the disc is too large ^ It must be long and long. When the chips are too small, the plastic substrate is easily fused with the metal reflective layer due to high temperature during pulverization, and the cyanide clock solution used is highly toxic, and the ethanol solution used is also easy to cause two. Therefore, in actual use, the above-mentioned method of recovering waste optical discs by the solvent method has a long process time, inefficient efficiency, and is liable to cause waste liquid pollution. _ > A method of recovering a waste disc from a corrugated layer and a plastic-based k-ray layer to produce a fine stripping agent and a discarding disc of the discarded disc of the discarded disc from the finished disc. The contact surface between the materials first generates micro cracks; after the irradiation, the groove is peeled off, and the stripping agent passes through the gap between the film and the plastic substrate, so that the metal reflective layer and the plastic substrate are taken out and washed and recovered. However, the method is For example, the Republic of China Announces the invention patent, which uses a metal reflective peeling phenomenon of the waste optical disc, and causes the metal to be inserted into the metal reflective layer containing the crack on the reflective layer of the metal. Stripping with the plastic plastic substrate; then peeling and drying, to complete the waste, an additional electromagnetic microwave must be added

1267406 —~一—五、发明说明(5) The device is bound to increase the problem. Based on the above; because of the "cost" and the same there will be waste liquid pollution. • The recycling of waste optical discs is indeed still necessary to improve the above-mentioned practices, there is a clock here, too travel liquid to remove one by oxidation, good Disadvantages, it uses a strong acid solution and then uses - strong alkali solution, night, dye layer, metal reflective layer and label layer, material and metal reverse; layer 2 = remove plastic film 'to recover a plastic base Recycling of optical discs: This is also the invention that can effectively improve the clothing. First disc, reduce the classification of discarded discs into [invention content] The main purpose of the present invention is to use a strong acid solubilize, A method for recycling and recycling a two-fold optical disc, which is a label layer, and further comprises a metal reflective layer and a dye layer, so that the present invention has a 'solution' solution to dissolve and remove a plastic disc. Processing cost: work 2 discard discs, reduce waste light I row pickling, oxidize to the body = disc fragments into a strong acid solution into the disc fragments; immerse the disc fragments -;: layer and; wear layer; Photolysis to remove plastic film; clear The light is known to be washed in the solution to dissolve the water, to return you to the ^ ^, the film, and to remove the residual metal component of the 3 ray disc. The plastic substrate and the reflective layer of the disc are discarded. 】 :\Logo-5\Five Continents\PK9833.

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1267406 V. INSTRUCTIONS (6) In order to make the present invention clear, the following will be made: 2: Features, and advantages can be more clearly - as described in detail below. For the example, please refer to the figure shown in Figure 4 for the following steps: the waste disc is broken and the recycling method is used. The acid solution is pickled in a strong acid solution to make 2 pieces. The disc fragments are immersed in the signature layer; the disc fragments are cleaned; the reflective layer, the dye layer and the standard are subjected to alkaline washing to dissolve and remove the plastic; Ϊ: the sheet is immersed in the strong alkali solution, and the residual moisture of the disc fragments is used to wash the disc fragments. And removing the metal components of the substrate and the reflective layer. For the use of the disc of the disc, please refer to Figure 4, the steps are: crushing the disc into a ^ recycling method, the first disc is placed in the crusher, and then the second i;:;: Discarded discs are mixed from a single layer and / into (1) / day back. Ττπ double-layer eucalyptus 2, [such as DVD, etc.] is provided between the top and bottom of the label layer 21, a first plastic substrate 22, a first metal reflective layer 23, and a first dye layer. 24. A spacer layer 25, a first layer, a dye layer (4) such as a ve_dye layer, a reflective iayer 13 and a label layer 14, and a monophonic disc 2 (eg, a DVD, etc.) The first plastic substrate 22, a first photoreactive dye, 24, a first metal reflective layer 23 and a label layer 21 are formed. The label layer 14 and 2 can be printed on the plastic base. a material or a surface of the first metal reflective layer 23. The double-layer optical disc 2, such as a DVD, etc.

C:\Logo-5\Five Continents\PK9833. ptd page 11 1267406 -5, invention description (7) two metal reflective layer 23', a second dye layer 24, and a second plastic substrate 22 ° due to The metal reflective layer of the disc is attached to the surface of the plastic substrate. Therefore, the purpose of this step is to first break the disc to reduce the surface area of the metal reflective layer. The disc is preferably broken into 0. · 5 to 2. Fragments of 〇 centimeters, especially about 1 cm, to speed up the reaction rate of subsequent processing, and then place the disc fragments in a porous volume. 'The porous container can be selected from space bags or plastics. Net material. Referring to FIG. 4, the second step of the method for recycling and recycling the optical disc of the present invention is: immersing the disc fragments in a strong acid solution for pickling, and removing the reflective layer, the dye layer and the label layer by oxygen; Disposing the disc fragments completed in the first step into a reaction tank containing a strong acid solution, preferably using a sulfuric acid solution of 60% to 100% by weight, especially a sulfuric acid solution having a percentage of 80%. The reaction tank is preferably an acid-resistant/tank tank to avoid strong acid and strong alkali corrosion. Furthermore, in this step, it is preferred to stir or oscillate the strong acid solution, and after stirring or shaking, the metal reflective layer, the dye layer and the label layer can be oxidized to be separated from the plastic substrate, and the reaction time is preferably between 15 minutes. 1 hour, especially about 30 minutes. Thereby, the separation rate of the metal reflective layer, the dye layer and the label layer from the plastic substrate can be effectively improved, and the reaction time can be shortened. Soil / One Please refer to Fig. 4, the first method of recycling and recycling the optical disc of the present invention is to wash the disc fragments. In detail, in the third step of the present invention, the refractory stone of the metal reflection I, the dye layer and the label layer has been oxidized: the fragments are sent to a cleaning tank for cleaning to remove the sulfuric acid residue, thereby avoiding the next V. The process of adding a strong alkali solution produces an acid-base neutralization reaction, and a monolayer

\Logo-5\Five Continents\PK9833. ptd Page 12 1267406 ----- V. Invention Description) Disc ^This step can completely remove the metal reflective layer, dye layer and standard layer t The plastic substrate ◦ is particularly a precipitate of the sulfuric acid residue, which is a metal precipitate containing silver, aluminum, a chromium alloy, or a copper alloy. When the disk is cleaned by multiple bubbles, the bottom layer of the sulfuric acid residue can be collected. The metal sinking material is preferably placed at a temperature between 9 〇〇 and 1 〇 5 摄, and its high temperature ashing = chipping = high temperature ashing furnace with a temperature exceeding 9 6 2 ° C, which can be recycled The anti-g, the metal component, or the addition of nitric acid to a solution such as silver nitrate, the ί metal reflective layer can be removed not only from the surface of the disc, but also can be reprocessed by the metal component or processing of the reflective layer of the E. The value of the metal recycling of the metal reflective layer of the film. Discard the first disc. Four = photo = ^, piece of light, and then use the method ^^5; remove the plastic film. For the change of the sap: 237 bath in the alkaline washing, but there is, because, this will be plastic:: = material; the strong === Royal, r = r: r (10) dissolved the age of ^ for effective removal The plastic film of the disc chip can be bathed in a strong test, and the plastic is used to obtain the polycarbonate plastic substrate - not in combination with a strong alkali. Referring to Figure 4 again, the method of the present invention is: cleaning the optical disc twice and recycling the second method. The fifth step is to send the light that has dissolved and removed the plastic film to the second C:\Logo-5\Five Continents\PK9833. ptd Page 13 1267406 'V. Description of the invention (9) Washing to remove the hydrogenated sodium hydroxide residue trapping liquid and liquid. In particular, the “fifth step cleaning unit” • the third step of sulfuric acid dissolution;:: used, after treatment can be done again:: the effect of the use of the economy. Night water source to save water and liquid usage, 4: Please refer to Figure 4, the steps are: remove the photo-disinfecting invention disc recycling and reuse method sixth - drying equipment or self-proclaimed; Residual moisture; this step is to use the sixth step of the invention to complete the recovery of the disc to remove the moisture of the disc. More specifically, the plastic substrate is removed from the residual π servant to adhere to the residual moisture: with: = (8) poly letter to the plastic substrate is the secondary material 4 cans; The method is easy to cause metal reflection;: due to the creation of the first disc, the m processing time is tedious and the waste liquid is dirty. (4) The invention is oxidized to remove the metal reflective layer, the material f and the label layer by adding a strong acid. And adding a strong alkali to dissolve and remove the plastic film, the art can effectively increase the reaction rate and shorten the reaction time, so as to quickly recover the metal component of the polycarbonate plastic substrate and the reflective layer of the discarded optical disc. Although the present invention has been described in detail with reference to the preferred embodiments of the present invention, it is intended that the invention may be modified and modified without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

C-\L〇g〇-5\Five Continents\PK9833.ptd Page 14 1267406 Simple circular description [Simple description of the drawing] Figure 1: Cross-sectional view of a conventional single-layer optical disc [1]. Figure 2: A cross-sectional view of a conventional single-layer optical disc [2]. Figure 3: A cross-sectional view of a conventional double-layer disc. Figure 4 is a block diagram showing the flow of the optical disc recycling and reuse method of the preferred embodiment of the present invention. Main component symbol description 1 Single-layer optical disc I 11 Plastic substrate 12 Photoreactive dye layer 13 Metal reflective layer 14 Label layer 2 Single-layer optical disc Π 21 Label layer 22 First plastic substrate 23 First metal reflective layer 24 First Photoreactive dye layer _ double-layer disc 22, second plastic substrate 23, 25 second metal reflective layer spacer layer 24, second photoreactive dye layer

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Claims (1)

〖1267406 々' patent application scope, a kind of optical disc recycling and reuser, which packs the disc to be broken into disc fragments; v ^ oxidizes and mashes into a strong acid solution for pickling and removing the reflective layer and dye layer And the label layer; cleaning the disc fragments; dissolving the disc fragments into a strong alkali solution to remove the plastic film; delaying washing &washing; removing the residual moisture of the disc fragments; The metal component of the substrate and the reflective layer is recycled. The disc is recycled according to the patent application scope of the patent. The disc contains at least one metal anti-(four) method. The components are selected from gold, silver, aluminum, and chromium. The gold of the human μ to the reflective layer is in accordance with the light gold and copper alloy described in the first item of the patent application. Among them, the strong acid solution is preferably a weight, a recycling method, and a sulfuric acid solution. The ratio of white/knife is 6 0 to 1 ο 〇 % according to the scope of patent application! Item CD 5 When pickling the disc fragments, choose to re-use the method, and t rewind and oscillate according to the 4th article of the patent application scope. When pickling the disc fragments, stir, shake and use the method, in which the clock is up to 1 hour. The reaction time is between 15 and 5 according to the scope of the patent application. The optical disc can be crushed into 0 to 2 liters and reused, and the reaction rate is continued. Fragment A 77, after accelerating C:\Logo-5\Five Continents\PK9833.ptd Page 16 1267406 VI. Patent application scope 7. The method for recycling and recycling optical discs according to item 1 of the patent application scope, wherein the strong base The solution is selected from the group consisting of sodium hydroxide solutions. 8. The method for recycling and recycling optical discs according to item 7 of the patent application scope, wherein the strong alkali solution is a sodium hydroxide solution having an equivalent concentration of 3 to 7N. 9. The method for recycling and recycling optical discs according to item 1 of the patent application scope, wherein the alkali washing reaction time is 36 to 60 hours. 1 〇, according to the patent application scope of the first paragraph of the optical disc recycling and reuse method, wherein the sodium hydroxide residual liquid can be recycled, after treatment, and then used as the cleaning water source after the above pickling step to save ice Liquid usage Page 17 C:\Logo-5\Five Continents\PK9833.ptd (§)