CN108526196A - A kind of method of quick stripping waste liquor crystal display polaroid - Google Patents

A kind of method of quick stripping waste liquor crystal display polaroid Download PDF

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Publication number
CN108526196A
CN108526196A CN201810253521.6A CN201810253521A CN108526196A CN 108526196 A CN108526196 A CN 108526196A CN 201810253521 A CN201810253521 A CN 201810253521A CN 108526196 A CN108526196 A CN 108526196A
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China
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crystal display
polaroid
acetone
liquid crystal
glass panel
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CN201810253521.6A
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CN108526196B (en
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朱能武
崔佳莹
罗德亮
吴平霄
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/40Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B5/00Operations not covered by a single other subclass or by a single other group in this subclass

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention belongs to waste liquid crystal display technical field of resource recovery, and in particular to a kind of method of quick stripping waste liquor crystal display polaroid.This method is first by the glass panel hot-water soak in liquid crystal display, it is tentatively removed after taking-up, is only stained with the glass panel of one layer of triacetate cellulose membrane, then carry out acetone soak again, pressure sensitive glueyness is set to drastically reduce, to remove remaining triacetate cellulose membrane.This method can completely detach complete or different damaged degree waste liquid crystal display each section, processing time is as short as 1h, wherein the acetone soak time is less than 30min, acetone dosage can be reduced, it is environmentally protective, and the mode that mechanical agitation or centrifugation can be used after acetone soak detaches film with glass substrate, avoids toxic side effect of the acetone to human body.The stripping of polaroid and the recycling of liquid crystal can be achieved at the same time using an acetone soak in this method, and the polaroid of stripping can be used as plastics pyrolysis or hydrolysis etc. and be recycled not by high temperature.

Description

A kind of method of quick stripping waste liquor crystal display polaroid
Technical field
The invention belongs to waste liquid crystal display technical field of resource recovery, and in particular to a kind of quick stripping waste liquor crystalline substance is shown The method of device polaroid.
Background technology
Liquid crystal display wraps up Formation of liquid crystals by two pieces of ito glass substrates for posting polaroid, is widely used in mobile phone, pen The image of note sheet, tablet and TV is shown, but the liquid crystal display caused by it failures such as screen leakage or broken screen easily occurs Learies are much larger than the learies of these electronic product complete machines, therefore the research and development of its resource utilization technology seem particularly critical. There are larger differences for the structure of matter of polaroid, ito glass substrate and liquid crystal three, and the maximization of benefit is recycled for realization, is had Necessity is isolated.In disassembly process, liquid crystal easily detaches dissolution, however polaroid and ito glass substrate are firmly bonded, if The difficulty that will increase crushing and screening in ito glass removal process cannot be efficiently separated, while can also reduce the rate of recovery of polaroid.
Polaroid can be pyrolyzed production combustible oil gas and hydro-thermal production acid, further high-valued recycle technology are also being ground In hair, and ito glass substrate can be used not only for dissipated metal extraction indium, also can as building materials or the raw material of glassware, because This, both of waste liquid crystal display is efficiently separated be resource utilization pre-processing committed step.Liquid crystal display Polaroid generally presss from both sides layer of polyethylene alcohol film by two layers of three cellulose acetate membrane and constitutes, and PET protection film is also posted outside polaroid, By pressure sensitive adhesive fitting on glass panels, if thus want realize polaroid detached with the lossless of glass substrate, it is necessary to reduce The bonding force of pressure sensitive adhesive.
Currently, the isolation technics research both at home and abroad about polaroid in waste liquid crystal display and ito glass substrate is less, lead to It is often based on single resource reclaim to research and develop, is difficult to retain the two primary characteristic in separation process.Chinese patent CN 104793369 A discloses a kind of equipment of separation polaroid and glass substrate, is based primarily upon the separation of material physical characteristic, but due to pressure sensitive adhesive hardly possible To reduce viscosity under this condition, therefore separation rate can be caused too low, while carrying out Mechanical Crushing in water body to cause glass The loss of indium resource on substrate.103331295 A of Chinese patent CN disclose a kind of glass panel production of waste liquid crystal display Industry recovery method and device are mainly recycled by physics exploitation, organic solvent immersion and the step of centrifugation, process cycle It is long, and it is difficult to the liquid crystal display for being suitable for being crushed.Chinese patent CN 101690936 discloses a kind of useless film crystal Glass substrate is directly warming up to 190~250 DEG C by pipe resource sharing treatment method of liquid crystal display, this method, by polaroid embrittlement After fill, do not consider its resource utilization issue, although and high-temperature process pressure sensitive adhesive can be made to lose viscosity, facilitate the stripping of polaroid From, but simultaneously because polaroid is destroyed, therefore lose utility value.(Nie's ear, Luo Xingzhang, Zheng Zheng, the great reputation such as Nie's ear. Environmental project journal, 2008,2 (9):1251-1254) people's play-by-play effect of the acetone in polaroid stripping process, on Polaroid immersion 4h is peelable, and down polaroid needs a couple of days.Chinese patent CN102002592 discloses a kind of waste and old liquid crystal The process of display screen processing, this method equally remove polaroid using acetone soak 4h.However acetone has strong volatility, Therefore above-mentioned existing research is impregnated in long-time, and acetone dosage is big, and charge stripping efficiency is low.In addition, the studies above be both needed into The first acetone soak of row removes polaroid, then carries out acetone soak again and collects liquid crystal, step is complicated, and for there is leakage The waste and old liquid crystal display of liquid, again the step redundancy of acetone soak.
Invention content
The shortcomings that overcome the prior art and deficiency, it is aobvious that primary and foremost purpose of the invention is to provide a kind of quick stripping waste liquor crystalline substance Show the method for device polaroid.This method is come using first hot-water soak, then the method for acetone soak in stripping waste liquor crystal display Polaroid, the acetone soak time is short, and stripping difficulty is low, can realize that polaroid is synchronous with liquid crystal by an acetone soak and return It receives, obtains each component of lossless waste liquid crystal display.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of method of quick stripping waste liquor crystal display polaroid, includes the following steps:
(1) various components in stripping waste liquor crystal display, respectively obtain backlight module, liquid crystal display, plastic frame and gold Belong to frame;
(2) two pieces of glass panels up and down of liquid crystal display are detached;
(3) it with glass panel in hot-water soak and lower glass panel, is taken out after finding polaroid color from depth to shallow, so The polaroid on the glass panel after lighter is removed afterwards, is only stained with the glass surface of one layer of triacetate cellulose membrane The polarizer portion of plate, stripping restores to the original state after the natural air drying of surface;
(4) it is only stained with the upper glass panel of one layer of triacetate cellulose membrane and lower glass panel with acetone soak, waits for pressure sensitive adhesive Triacetate cellulose membrane is removed after losing viscosity, is restored to the original state after the acetone volatilization of triacetate fiber film surface.
Preferably, step (3) described hot water temperature is 80~100 DEG C.
Preferably, a length of 5~20min when step (3) described hot-water soak.
For the glass panel taken out after hot-water soak, if stored in the environment for a long time it is untreated, lead to glass surface Plate surface is cooling and color recovery, then needs to repeat step (3).
The polarizer portion removed described in step (3) includes PET film, triacetate cellulose membrane and polyvinyl alcohol film.
Preferably, a length of 15~30min when acetone soak described in step (4).
It is furthermore preferred that on acetone soak described in step (4) glass panel when a length of 15min, impregnate lower glass panel When a length of 30min.
Preferably, triacetate cellulose membrane is removed described in step (4) using the glass panel after taking out acetone soak, then into The mode that row is removed by hand.
For the glass panel taken out after acetone soak, if stored in the environment for a long time it is untreated, lead to glass surface Plate surface acetone volatilizees completely, then needs to repeat step (4).
Preferably, described in step (4) remove triacetate cellulose membrane using directly in acetone carry out mechanical agitation or from The mode of the heart.
Preferably, after step (4), the residual solution obtained after acetone soak is distilled, acetone and liquid are isolated Crystalline substance, recycling utilize once again.
Compared with prior art, the present invention having the following advantages that and advantageous effect:
(1) present invention by two parts from method, can be by the polarisation in complete or different damaged degree waste liquid crystal display Piece completely detaches, and removes PET film, triacetate cellulose membrane and poly- second in glass substrate surface polaroid by hot-water soak first The combination film layer of enol film excludes combination film layer and hinders the infiltration of acetone, then passes through acetone soak, you can make pressure-sensitive adhesive Property significantly reduce, to remove the triacetate cellulose membrane of remaining polaroid.This method is simple, low for equipment requirements, total to handle Time is less than 1h, and the wherein acetone soak time is less than 30min, can reduce the dosage of acetone, environmentally protective, improves stripping rate.
(2) stripping of polaroid and the recycling of liquid crystal can be achieved at the same time by an acetone soak in the present invention, does not need two Secondary acetone soak.
(3) method of present invention stripping liquid crystal display polaroid is not necessarily to high-temperature process, therefore polaroid will not be by broken Bad, polaroid each section obtained by stripping can be used as plastics pyrolysis or hydrolysis etc. and be recycled.
(4) glass substrate in the present invention, can be by way of mechanical agitation or centrifugation by three acetic acid after acetone soak Tunica fibrosa is separated with glass substrate, without human intervention, avoids toxic side effect of the acetone to human body.
Description of the drawings
Fig. 1 is the process flow chart of the method for the quick stripping waste liquor crystal display polaroid.
Specific implementation mode
With reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are not It is limited to this.For not specifically specified technological parameter, routine techniques progress can refer to.
The technological process of stripping waste liquor crystal display polaroid is as shown in Figure 1 in the embodiment of this part.
Embodiment 1
The present embodiment provides a kind of methods of quick stripping waste liquor crystal display polaroid:
1, it is pried open along waste liquid crystal display metal edge frame commissure with flat mouth screwdriver, takes out backlight module recycling, wherein Intact film can utilize once again, liquid crystal display, plastic frame, metal edge frame classification recycling.
2, it is scratched along liquid crystal display edge with pocket knife, detaches two pieces of glass panels up and down.
3, it with 80 DEG C of water immersion glass panel 20min, is taken out after finding polaroid color from depth to shallow, removes polaroid The polaroid film layer of middle PET film, triacetate cellulose membrane and polyvinyl alcohol film composition.Released part is restored after the natural air drying of surface Original state.
4, the top glass substrate 15min and lower glass substrate of triacetate cellulose membrane are only stained with acetone submergence
30min makes pressure sensitive adhesive lose viscosity, takes out the glass panel after impregnating, and removes triacetate cellulose membrane, stripping by hand Part restores to the original state after the volatilization of surface acetone.
5, the residual solution obtained after acetone soak is distilled, isolates acetone and liquid crystal, recycling utilizes once again.
Embodiment 2
The present embodiment provides a kind of methods of quick stripping waste liquor crystal display polaroid:
1, it is pried open along waste liquid crystal display metal edge frame commissure with flat mouth screwdriver, takes out backlight module recycling, wherein Intact film can utilize once again, liquid crystal display, plastic frame, metal edge frame classification recycling.
2, it is scratched along liquid crystal display edge with pocket knife, detaches two pieces of glass panels up and down.
3, it with 100 DEG C of water immersion glass panel 5min, is taken out after finding polaroid color from depth to shallow, removes polaroid The combination film layer of middle PET film, triacetate cellulose membrane and polyvinyl alcohol film.Released part restores to the original state after the natural air drying of surface.
4, it is only stained with the top glass substrate 15min and lower glass substrate 30min of triacetate cellulose membrane with acetone submergence, makes pressure Quick glue loses viscosity, removes triacetate cellulose membrane by mechanical agitation, released part restores to the original state after the volatilization of surface acetone.
5, the residual solution obtained after acetone soak is distilled, isolates acetone and liquid crystal, recycling utilizes once again.
Embodiment 3
The present embodiment provides a kind of methods of quick stripping waste liquor crystal display polaroid:
1, it is pried open along waste liquid crystal display metal edge frame commissure with flat mouth screwdriver, takes out backlight module recycling, wherein Intact film can utilize once again, liquid crystal display, plastic frame, metal edge frame classification recycling.
2, it is scratched along liquid crystal display edge with pocket knife, detaches two pieces of glass panels up and down.
3, it with 90 DEG C of water immersion glass panel 10min, is taken out after finding polaroid color from depth to shallow, removes polaroid The combination film layer of middle PET film, triacetate cellulose membrane and polyvinyl alcohol film.Released part restores to the original state after the natural air drying of surface.
4, it is only stained with the top glass substrate and lower glass substrate 30min of triacetate cellulose membrane with acetone submergence, makes pressure sensitive adhesive Viscosity is lost, triacetate cellulose membrane is removed by centrifugation, released part restores to the original state after the volatilization of surface acetone.
5, the residual solution obtained after acetone soak is distilled, isolates acetone and liquid crystal, recycling utilizes once again.
Above-described embodiment is preferrred embodiment of the present invention, but embodiments of the present invention are not limited to above-mentioned implementation Example, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications, Equivalent substitute mode is answered, is included within the scope of the present invention.

Claims (7)

1. a kind of method of quick stripping waste liquor crystal display polaroid, which is characterized in that include the following steps:
(1) various components in stripping waste liquor crystal display, respectively obtain backlight module, liquid crystal display, plastic frame and metal edges Frame;
(2) two pieces of glass panels up and down of liquid crystal display are detached;
(3) it with glass panel in hot-water soak and lower glass panel, is taken out after finding polaroid color from depth to shallow, it is then right The polaroid on glass panel after lighter is removed, and the glass panel of one layer of triacetate cellulose membrane is only stained with, The polarizer portion of stripping restores to the original state after the natural air drying of surface;
(4) it is only stained with the upper glass panel of one layer of triacetate cellulose membrane and lower glass panel with acetone soak, waits for that pressure sensitive adhesive loses Triacetate cellulose membrane is removed after viscosity, is restored to the original state after the acetone volatilization of triacetate fiber film surface.
2. the method for quick stripping waste liquor crystal display polaroid according to claim 1, it is characterised in that:Step (3) institute It is 80~100 DEG C to state hot water temperature.
3. the method for quick stripping waste liquor crystal display polaroid according to claim 1, it is characterised in that:Step (3) institute State a length of 5~20min when hot-water soak.
4. the method for quick stripping waste liquor crystal display polaroid according to claim 1, it is characterised in that:In step (4) A length of 15~30min when the acetone soak.
5. the method for quick stripping waste liquor crystal display polaroid according to claim 4, it is characterised in that:In step (4) The when a length of 15min of glass panel on the acetone soak impregnates the when a length of 30min of lower glass panel.
6. the method for quick stripping waste liquor crystal display polaroid according to claim 1, it is characterised in that:In step (4) The stripping triacetate cellulose membrane by the way of directly carrying out mechanical agitation or centrifugation in acetone.
7. according to the method for any one of the claim 1~6 quick stripping waste liquor crystal display polaroid, it is characterised in that: After step (4), the residual solution obtained after acetone soak is distilled, isolates acetone and liquid crystal, recycling utilizes once again.
CN201810253521.6A 2018-03-26 2018-03-26 Method for quickly stripping polaroid of waste liquid crystal display Active CN108526196B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111862834A (en) * 2020-06-22 2020-10-30 长春希达电子技术有限公司 Surface film pasting process-based LED full-color display product film and glue separation method
CN115070997A (en) * 2022-06-13 2022-09-20 宁波江丰复合材料科技有限公司 Separation method of BS (base station) base and product for CFRP (carbon fiber reinforced plastics) industry

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CN102002591A (en) * 2010-09-28 2011-04-06 苏州群瑞环保科技有限公司 Process for extracting indium from waste liquid crystal display screen
WO2012086440A1 (en) * 2010-12-20 2012-06-28 パナソニック株式会社 Rare earth magnet recovery method
CN103129096A (en) * 2011-12-05 2013-06-05 日东电工株式会社 Peeling method of adhesive sheet and double-sided adhesive sheet
CN103191903A (en) * 2013-04-11 2013-07-10 合肥工业大学 Method for recycling waste LCD (liquid crystal display) panels
CN104498721A (en) * 2015-01-08 2015-04-08 中国科学院城市环境研究所 Innocent treatment method and system for liquid crystal panel
WO2016110825A1 (en) * 2015-01-08 2016-07-14 OMIZZOLO, Giacomo Method and apparatus for the disposal of photovoltaic panels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102002591A (en) * 2010-09-28 2011-04-06 苏州群瑞环保科技有限公司 Process for extracting indium from waste liquid crystal display screen
WO2012086440A1 (en) * 2010-12-20 2012-06-28 パナソニック株式会社 Rare earth magnet recovery method
CN103129096A (en) * 2011-12-05 2013-06-05 日东电工株式会社 Peeling method of adhesive sheet and double-sided adhesive sheet
CN103191903A (en) * 2013-04-11 2013-07-10 合肥工业大学 Method for recycling waste LCD (liquid crystal display) panels
CN104498721A (en) * 2015-01-08 2015-04-08 中国科学院城市环境研究所 Innocent treatment method and system for liquid crystal panel
WO2016110825A1 (en) * 2015-01-08 2016-07-14 OMIZZOLO, Giacomo Method and apparatus for the disposal of photovoltaic panels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111862834A (en) * 2020-06-22 2020-10-30 长春希达电子技术有限公司 Surface film pasting process-based LED full-color display product film and glue separation method
CN115070997A (en) * 2022-06-13 2022-09-20 宁波江丰复合材料科技有限公司 Separation method of BS (base station) base and product for CFRP (carbon fiber reinforced plastics) industry

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