CN107159681A - A kind of method that liquid crystal is reclaimed from TFT LCD liquid crystal displays - Google Patents
A kind of method that liquid crystal is reclaimed from TFT LCD liquid crystal displays Download PDFInfo
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- CN107159681A CN107159681A CN201710359916.XA CN201710359916A CN107159681A CN 107159681 A CN107159681 A CN 107159681A CN 201710359916 A CN201710359916 A CN 201710359916A CN 107159681 A CN107159681 A CN 107159681A
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- liquid crystal
- extractant
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- liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/02—Solvent extraction of solids
- B01D11/0203—Solvent extraction of solids with a supercritical fluid
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a kind of method that liquid crystal is reclaimed from TFT LCD liquid crystal displays, comprise the following steps：TFT LCD liquid crystal displays are disassembled, liquid crystal cell is isolated, excision liquid crystal cell surrounding is stained with the side glass of sealant, takes liquid crystal glass base to be placed in closed extractor, extractant is passed through into extractor, extractant is fully contacted with liquid crystal glass base；Extractant is reached the temperature and pressure needed for Supercritical Conditions, the liquid crystal on glass substrate is fully dissolved with the extractant fluid of supercriticality；The supercritical fluid dissolved with liquid crystal is set to enter closed separator by reducing pressure, the extractant allowed in supercritical fluid is converted to gas, and liquid crystal is converted to liquid, and gaseous extractant and the liquid crystal of liquid are collected respectively；The liquid crystal of the liquid of collection is put into hot baking machine processing is dried, the TFT liquid crystal after drying process is subjected to low temperature storage, the condition of low temperature storage is：50 0 DEG C of temperature, time 24h.
Description
Technical field
The present invention relates to TFT-LCD LCD Technologies field, and in particular to a kind of to be returned from TFT-LCD liquid crystal displays
The method for receiving liquid crystal.
Background technology
At present, the structure of general T FT liquid crystal displays includes TFT substrate and the CF substrates being oppositely arranged, the TFT substrate
First electrode layer and the second electrode lay (generally ITO, indium oxide film), first electrode are respectively equipped with the face relative with CF substrates
First orientation layer and second orientation layer, the surrounding between the TFT substrate and CF substrates are respectively equipped with layer and the second electrode lay
Edge is provided with glue frame, thus, and first orientation layer, second orientation layer and glue frame are surrounded and accommodated in a cavity, the cavity
Liquid crystal.TFT substrate plays on-off action during display, and control pixel is normally shown；CF substrates are optical filter, pass through R, G, B
Three primary colours realize colored display；ITO electrode layer plays conducting voltage and the function of current；Oriented layer forms groove in manufacturing process,
Liquid crystal is uniformly lain in groove, reach the effect that liquid crystal is uniformly directed；Glue frame supports TFT substrate and CF substrates, prevents liquid
Crystalline substance outflow；Liquid crystal is a kind of organic substance, and the optical activity for making liquid crystal molecule by voltage and light changes, so as to reach production
The effect that product are shown.
The existing method for reclaiming liquid crystal, is mostly first dissolved in liquid crystal composition wherein with organic solvent, then use ionic adsorption
Material goes the removal of impurity, finally reclaims liquid crystal using the method for distillation.This method operating process is numerous and diverse, and high energy consumption is, it is necessary to using a large amount of
Organic solvent, and the liquid crystal rate of recovery is not high, and purity is low.Reclaimed for high-volume, the purification processes ten of later stage organic solvent
Divide difficulty.Also document report is extracted using supercritical fluid, the purity that this method reclaims liquid crystal is high, efficiency high, no
The chemical property of liquid crystal material can be destroyed, environmental protection characteristic is good, has a extensive future.But, do not faced so far using super also
The implementation and Special Equipment of boundary's fluid extraction liquid crystal.
The content of the invention
The present invention is intended to provide a kind of method that liquid crystal is reclaimed from TFT-LCD liquid crystal displays.
The present invention provides following technical scheme：
A kind of method that liquid crystal is reclaimed from TFT-LCD liquid crystal displays, comprises the following steps：
(1) TFT-LCD liquid crystal displays are disassembled, liquid crystal cell is isolated, excision liquid crystal cell surrounding is stained with the side glass of sealant
Glass, takes liquid crystal glass base to be placed in closed extractor, extractant is passed through into extractor, make extractant and liquid-crystalline glasses
Substrate is fully contacted；
(2) extractant is made to reach the temperature and pressure needed for Supercritical Conditions, with the extractant stream of supercriticality
Body makes the liquid crystal on glass substrate fully dissolve；
(3) supercritical fluid dissolved with liquid crystal is entered closed separator by reducing pressure, allow in supercritical fluid
Extractant be converted to gas, and liquid crystal is converted to liquid, gaseous extractant and the liquid crystal of liquid collected respectively；
(4) liquid crystal of the liquid of collection is put into hot baking machine and processing is dried, dry condition is：Temperature 70-90
DEG C, the TFT liquid crystal after drying process is carried out low temperature storage by time 40-60min, and the condition of low temperature storage is：Temperature -50-0
DEG C, time 24h.
The temperature set in step (1) extractor is 30-60 DEG C, and pressure is 60-90bar.
The extractant is carbon dioxide.
Humidity 50%RH~100%RH that low temperature is stored in the step (4).
Compared with prior art, the beneficial effects of the invention are as follows：The present invention uses carbon dioxide as extractant, relative to
The method that existing use organic solvent is dissolved, good economy performance, environmental protection characteristic is good；The present invention is protected with relatively low extraction temperature
The stability of liquid crystal composition is demonstrate,proved, the difficulty for reducing liquid crystal purification using a small amount of organic solvent avoids arbitrarily discarded liquid crystal
The environmental pollution brought with the new liquid crystal of manufacture；Extraction parameters are easily controllable in the present invention, and the effect of supercritical extract is depended on
The density of supercritical fluid, and the density of supercritical fluid is in a system of the invention, can pass through constant temperature water bath apparatus and gas-liquid
Booster pump is controlled, and is selected appropriate temperature and pressure, can be significantly improved the recovery rate of rate of extraction and liquid crystal, liquid crystal is carried
Rate is taken up to 99%.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
A kind of method that liquid crystal is reclaimed from TFT-LCD liquid crystal displays of embodiment, comprises the following steps：
(1) TFT-LCD liquid crystal displays are disassembled, liquid crystal cell is isolated, excision liquid crystal cell surrounding is stained with the side glass of sealant
Glass, takes liquid crystal glass base to be placed in closed extractor, extractant is passed through into extractor, make extractant and liquid-crystalline glasses
Substrate is fully contacted；
(2) extractant is made to reach the temperature and pressure needed for Supercritical Conditions, with the extractant stream of supercriticality
Body makes the liquid crystal on glass substrate fully dissolve；
(3) supercritical fluid dissolved with liquid crystal is entered closed separator by reducing pressure, allow in supercritical fluid
Extractant be converted to gas, and liquid crystal is converted to liquid, gaseous extractant and the liquid crystal of liquid collected respectively；
(4) liquid crystal of the liquid of collection is put into hot baking machine and processing is dried, dry condition is：Temperature 70-90
DEG C, the TFT liquid crystal after drying process is carried out low temperature storage by time 40-60min, and the condition of low temperature storage is：Temperature -50-0
DEG C, time 24h.
The temperature set in step (1) extractor is 30-60 DEG C, and pressure is 60-90bar.
The extractant is carbon dioxide.
Humidity 50%RH~100%RH that low temperature is stored in the step (4).
It is obvious to a person skilled in the art that the invention is not restricted to the details of the one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than the explanation is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Although not each moreover, it will be appreciated that the present specification is described in terms of embodiments
Embodiment is only comprising an independent technical scheme, and this narrating mode of specification is only this area for clarity
Technical staff should be using specification as an entirety, and the technical solutions in the various embodiments may also be suitably combined, forms this
Art personnel may be appreciated other embodiment.
Claims (4)
1. a kind of method that liquid crystal is reclaimed from TFT-LCD liquid crystal displays, it is characterised in that comprise the following steps：
(1) TFT-LCD liquid crystal displays are disassembled, liquid crystal cell is isolated, excision liquid crystal cell surrounding is stained with the side glass of sealant, taken
Liquid crystal glass base is placed in closed extractor, and extractant is passed through into extractor, makes extractant and liquid crystal glass base
Fully contact；
(2) extractant is reached the temperature and pressure needed for Supercritical Conditions, made with the extractant fluid of supercriticality
Liquid crystal on glass substrate fully dissolves；
(3) supercritical fluid dissolved with liquid crystal is made to enter closed separator by reducing pressure, the extraction allowed in supercritical fluid
Take agent to be converted to gas, and liquid crystal is converted to liquid, gaseous extractant and the liquid crystal of liquid are collected respectively；
(4) liquid crystal of the liquid of collection is put into hot baking machine and processing is dried, dry condition is：70-90 DEG C of temperature, when
Between 40-60min, by after drying process TFT liquid crystal carry out low temperature storage, low temperature storage condition be：- 50-0 DEG C of temperature, when
Between 24h.
2. a kind of method that liquid crystal is reclaimed from TFT-LCD liquid crystal displays according to claim 1, it is characterised in that：Institute
It is 30-60 DEG C to state the temperature set in step (1) extractor, and pressure is 60-90bar.
3. a kind of method that liquid crystal is reclaimed from TFT-LCD liquid crystal displays according to claim 1, it is characterised in that：Institute
Extractant is stated for carbon dioxide.
4. a kind of method that liquid crystal is reclaimed from TFT-LCD liquid crystal displays according to claim 1, it is characterised in that：Institute
State humidity 50%RH~100%RH that low temperature is stored in step (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710359916.XA CN107159681A (en) | 2017-05-20 | 2017-05-20 | A kind of method that liquid crystal is reclaimed from TFT LCD liquid crystal displays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710359916.XA CN107159681A (en) | 2017-05-20 | 2017-05-20 | A kind of method that liquid crystal is reclaimed from TFT LCD liquid crystal displays |
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| CN107159681A true CN107159681A (en) | 2017-09-15 |
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| CN201710359916.XA Pending CN107159681A (en) | 2017-05-20 | 2017-05-20 | A kind of method that liquid crystal is reclaimed from TFT LCD liquid crystal displays |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108941151A (en) * | 2018-06-07 | 2018-12-07 | 深圳市华星光电技术有限公司 | The recycling of liquid crystal display liquid crystal and measuring equipment and the recycling of liquid crystal display liquid crystal and metering method |
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| JP2001235718A (en) * | 2000-02-23 | 2001-08-31 | Mitsuo Kamiwano | Liquid crystal panel recycling processing method and recycling processing system |
| JP2008216566A (en) * | 2007-03-02 | 2008-09-18 | Sharp Corp | Method and apparatus for recovering glass substrate of waste liquid crystal panel |
| CN102207640A (en) * | 2010-03-30 | 2011-10-05 | 比亚迪股份有限公司 | Method for recycling TFT (Thin Film Transistor) liquid crystal display with liquid crystal bubbles |
| CN102500128A (en) * | 2011-10-14 | 2012-06-20 | 合肥工业大学 | Method and system for recovering crystal liquid in abandoned liquid crystal display |
| CN103537119A (en) * | 2013-10-09 | 2014-01-29 | 周景天 | Method for extracting liquid crystals from liquid crystal screen |
| CN105080938A (en) * | 2015-09-02 | 2015-11-25 | 扬州宁达贵金属有限公司 | Method for recycling indium, glass and polaroid from waste liquid crystal display screen |
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2017
- 2017-05-20 CN CN201710359916.XA patent/CN107159681A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001235718A (en) * | 2000-02-23 | 2001-08-31 | Mitsuo Kamiwano | Liquid crystal panel recycling processing method and recycling processing system |
| JP2008216566A (en) * | 2007-03-02 | 2008-09-18 | Sharp Corp | Method and apparatus for recovering glass substrate of waste liquid crystal panel |
| CN102207640A (en) * | 2010-03-30 | 2011-10-05 | 比亚迪股份有限公司 | Method for recycling TFT (Thin Film Transistor) liquid crystal display with liquid crystal bubbles |
| CN102500128A (en) * | 2011-10-14 | 2012-06-20 | 合肥工业大学 | Method and system for recovering crystal liquid in abandoned liquid crystal display |
| CN103537119A (en) * | 2013-10-09 | 2014-01-29 | 周景天 | Method for extracting liquid crystals from liquid crystal screen |
| CN105080938A (en) * | 2015-09-02 | 2015-11-25 | 扬州宁达贵金属有限公司 | Method for recycling indium, glass and polaroid from waste liquid crystal display screen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108941151A (en) * | 2018-06-07 | 2018-12-07 | 深圳市华星光电技术有限公司 | The recycling of liquid crystal display liquid crystal and measuring equipment and the recycling of liquid crystal display liquid crystal and metering method |
| CN108941151B (en) * | 2018-06-07 | 2020-05-29 | 深圳市华星光电技术有限公司 | Liquid crystal screen liquid crystal recycling and metering device and liquid crystal screen liquid crystal recycling and metering method |
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Application publication date: 20170915 |