JP4374772B2 - Liquid crystal recovery method - Google Patents

Liquid crystal recovery method Download PDF

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Publication number
JP4374772B2
JP4374772B2 JP2000364912A JP2000364912A JP4374772B2 JP 4374772 B2 JP4374772 B2 JP 4374772B2 JP 2000364912 A JP2000364912 A JP 2000364912A JP 2000364912 A JP2000364912 A JP 2000364912A JP 4374772 B2 JP4374772 B2 JP 4374772B2
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Prior art keywords
liquid crystal
crystal composition
recovery method
crystal panel
hot water
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JP2002166259A (en
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正彦 佐藤
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Sony Corp
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Sony Corp
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Description

【0001】
【発明の属する技術分野】
本発明は液晶回収方法に関し、特に使用済み製品に組み込まれた液晶パネルから液晶組成物を回収する液晶回収方法に関する。
【0002】
【従来の技術】
近年、廃棄物や地球環境問題が注目を集め、これまでの大量生産、大量消費、大量廃棄型の経済システムから資源循環型経済システムへの転換が社会的に重要な課題となってきており、処理の優先順位を法制化した循環型社会形成推進基本法(平成12年6月2日公布)によれば、1.廃棄物の発生抑制(リデュース)、2.再利用(リユース)、3.再資源化(マテリアルリサイクル)、4.サーマルリサイクル、5.適性処分とされている。
【0003】
現在、家電のリサイクルとしては、例えばテレビの例では、CRT(Cathode Ray Tube)のガラスを切断して電子銃や蛍光体を除去した後、ガラスカレットとして元のCRT用ガラスに再生使用するリサイクル技術がすでに実用化されつつある。
【0004】
一方,電子機器、情報機器などの廃棄物に含まれるテレビと同じ表示装置である液晶パネルは現在まだ廃棄物の量が比較的少ないこともあって、処理施設で製品とともに破砕されて、シュレッダーダストなどとともに埋立て処理されたり、焼却処理後埋立て処理されているのが現状であり、液晶組成物をはじめとする資源の有効活用はなされていない。
【0005】
しかし、液晶パネルは省電力のみならず省スペースに貢献できる表示装置であり、近年パソコンなど情報機器の急激な普及に伴い急激に生産量が増大してきているため、今後廃液晶パネルの増加に備えたリサイクル技術の確立が早急に要求される。
【0006】
液晶パネルのリサイクル関連技術としては、特開2000−24613で廃液晶パネルを450〜650℃に加熱し液晶パネルに設けられている有機物をガス化して除去した後ガラスカレットをリサイクルする方法が開示されている。
【0007】
また、特開2000−51829では液晶表示装置の廃棄物を固体熱媒体が流動している流動層内に投入しリサイクル可能なガラスを回収する方法が開示されている。
【0008】
さらに、特開2000−84531では廃液晶パネルをせん断破壊した後、約1200℃の非鉄精錬炉に投入しガラスを非鉄精錬炉内での鉄の除去処理に利用する方法が開示されている。
【0009】
また、特開2000−189939では液晶ディスプレイを破砕後高温加熱処理した後溶剤処理しガラスカレットなどに再資源化する方法が開示されている。
【0010】
【発明が解決しようとする課題】
しかし、これらの技術は廃液晶パネル全体をまず高温処理することを特徴としており、このため処理には膨大なエネルギーと大掛かりな設備が必要となりリサイクルのための効率が必ずしも最良とは考えられない。また、多くの技術において主眼は液晶パネルを構成するガラスのリサイクルに向けられており、液晶パネル中から液晶組成物を回収しリサイクルしている例はない。
【0011】
一般に液晶組成物はアルコールやアセトンなどの有機溶剤に任意に溶解することが知られており、液晶パネルからの液晶組成物の回収も液晶パネル剥離または破砕後にこれら有機溶剤に溶かし込み回収する方法が容易に考え付く。
【0012】
しかし、これら有機溶剤を使用した場合、溶けこんだ液晶組成物を分離するために加熱蒸留する必要があり、危険が伴うばかりでなく多くのエネルギーを必要とする。また、使用した有機溶剤の処理などでリサイクル処理における環境負荷が増大する可能性がある。
【0013】
さらに、有機溶剤は多くの不純物も溶解し易いため、回収した液晶組成物の精製には困難を極めることも予想される。
本発明はこのような点に鑑みてなされたものであり、使用済みとなった液晶パネルから安全かつ経済的に液晶組成物を回収する液晶回収方法を提供することを目的とする。
【0014】
【課題を解決するための手段】
本発明によれば、液晶パネルから液晶組成物を回収する液晶回収方法において、前記液晶パネルを構成するガラス基板を剥離または破砕し、熱水中に浸漬し、前記液晶組成物を前記熱水に溶解して溶解液とし、前記溶解液を室温まで冷却し、前記液晶組成物を前記溶解液から分離回収し、前記液晶組成物を溶解させる前記熱水は比抵抗が13MΩ・cm以上、金属イオン0.2ppb以下の純水であり、前記液晶組成物の溶解及び分離時にイオン性不純物を前記液晶組成物から同時に除去する、ことを特徴とする液晶回収方法が提供される。
【0015】
液晶組成物の溶解に水を使用するので安全であり、取り扱いが容易になる。また、有機溶剤に比べ不純物が溶解しにくいので、不純物の少ない液晶組成物の回収が可能となる。さらに、有機溶剤の回収・処理に係る大掛りな設備を必要としないので経済的であり、また、環境に負荷を与えずに液晶組成物の回収が可能となる。
【0016】
さらに、上記溶解に使用する水として、例えば比抵抗が13MΩ・cm以上で金属イオン0.2ppb以下の純水を使用することにより、溶解および分離時にイオン性不純物を液晶組成物から同時に除去することが可能となる。
【0017】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
図1は本発明の実施の形態に係る液晶回収方法の概略を示す図である。
【0018】
液晶パネルを構成するガラス基板を剥離もしくは破砕処理をし(S1)、ガラス基板間に封入している液晶組成物を外部に露出させ、これを熱水中に浸漬し液晶パネル中の液晶組成物を溶解する(S2)。液晶組成物が溶解した溶液を回収し(S3)、冷却した(S4)後、水と液晶組成物を分離し(S5)、液晶組成物を回収する(S6)。
【0019】
次に、液晶パネルの構成について述べる。図2は液晶パネルの概略の断面図を示した図である。
内面にブラックマスク、カラーフィルター、透明導電膜、液晶配向膜などが形成されたカラーフィルター基板11は、エポキシ接着剤などからなるシール材12により内面にTFT(Thin Film Transistor)、信号線、透明電極、液晶配向膜が形成されたTFT基板13と貼り合せられている。そして、貼り合せたカラーフィルター基板11とTFT基板13の間に液晶組成物14が充填され液晶パネル10が構成されている。
【0020】
次に、液晶組成物の純水に対する溶解度について述べる。メルクジャパン社製の典型的なネマチック液晶材料ZLI−4792およびTFT型液晶パネルに使用されている液晶組成物A、Bについて、液晶組成物の純水に対する溶解度を調べた結果を表1に示す。各液晶組成物の比重はそれぞれ1.049、1.11、1.12である。
【0021】
【表1】

Figure 0004374772
【0022】
純水の温度が80℃で各液晶組成物は任意に溶解、または部分的に溶解し、純水の温度が90℃以上では各液晶組成物は任意に溶解する。このことから、液晶組成物を溶解する純水の温度は80℃以上とすることが望ましい。
【0023】
次に、液晶組成物を回収する方法について述べる。図3は液晶組成物14を回収するための分液ロートの概略の断面図である。
分液ロート20は複数の層に分離した液体をコック23を開閉することにより各層の液体を分別して排出することができる。液晶組成物14が溶解した溶液が冷却後、水層21と液晶層22とに分離した後、分離後の水層21と分離後の液晶層22とをコック23を操作し、液晶組成物14を含んでいる液晶層22のみを回収する。
【0024】
次に本発明の実施の手順について説明する。
液晶パネル10を構成するカラーフィルター基板11とTFT基板13を剥離もしくは破砕処理をし、カラーフィルター基板11とTFT基板13の間に封入されている液晶組成物14を外部に露出させる。これを80℃以上に加熱した純水を入れた容器中に浸漬し、液晶組成物14を純水に溶解する。この作業を繰り返し、所定量の液晶組成物14が溶解した時点で溶液を回収し冷却する。溶液を分液ロート20に移して静置し、水層21と液晶層22とに分離されるのを待って、分離した液晶層22を分液ロート20により回収する。
【0025】
なお、TFT方式の液晶パネルに使われている液晶組成物14は比重が1よりも大きいものが多く、上記説明では分液ロート20の上層に水層21、下層に液晶層22を示している。液晶の種類によっては上層に液晶層、下層に水層が分離されることもある。
【0026】
次に、本発明の実施の形態を、パソコン用液晶モニターに使用されていた15型(対角38cm)のTFT方式液晶パネルに適用した場合を例にして説明する。
【0027】
パソコン用液晶モニターに使用されている15型(対角38cm)のTFT方式液晶パネルから液晶組成物の回収を行う。
まず、取出された液晶パネル10の偏光板や駆動用ICが搭載されている回路基板などをカッターなどを用いて取り除いた後、ガラス切りを使って液晶パネル10がおよそ6分割となるように表裏のガラス表面にキズをつけ、ガラスを切断する。同様に20枚の液晶パネルを切断後、5リットルのガラス製ビーカーに入れ、比抵抗が13MΩ・cm以上で金属イオン0.2ppb以下の純水2リットルを注いだのち、電器コンロにて加熱し90〜95℃になるように調整しながら10分間加熱する。
【0028】
ビーカー中からガラスを取り除いた後自然に冷却し、室温付近になった時に上澄みの水をデカンテーションにより残りが100ml程度になるまで取り除く。そして、ビーカー中の水層と液晶層とに分離した混合液を200mlの容積の分液ロート20に移す。分液ロート20を軽く振って中の液体を攪拌したのち静置し、水層21と液晶層22とに分離されるのを待って分液ロート20のコック23を開き液晶層22のみを回収する。
【0029】
このように、上記方法により15型液晶パネル20枚から回収された液晶組成物の量は7.6gであり、パネルの面積から計算した理論回収量の95%に相当する高い回収率で液晶組成物を得ることができる。
【0030】
また、その比抵抗は12.5MΩ・cmであり、実用上問題のないレベルである。
なお、上記構造は現在主流となりつつあるTFT方式の液晶パネルの例であるが、本発明はこの構造に限定されるものではなく従来のSTN(Super Twisted Nematic)方式、TN(Twisted Nematic)方式などの液晶パネルにも適用可能である。
【0031】
【発明の効果】
以上説明したように本発明では、液晶組成物を熱水に溶解し、冷却後に液晶組成物を分離回収するようにしたので、大掛かりな設備を必要とせず、安全で、かつ環境に負荷を与えないで、液晶パネルからの液晶組成物の回収および再資源化ができる。
【0032】
特に、有機溶剤を使用せず、純水を使用するので、有機溶剤の回収・処理のための大掛りな設備を必要としない。さらに、不純物の少ない液晶組成物の回収が可能となる。
【0033】
また、使用済み液晶パネルから高い回収率で液晶組成物を回収でき、再資源化に利用できる。
【図面の簡単な説明】
【図1】本発明の実施の形態に係る液晶回収方法の概略の説明図である。
【図2】液晶パネルの概略の断面図である。
【図3】分液ロートの概略の断面図である。
【符号の説明】
10……液晶パネル、11……カラーフィルター基板、12……シール材、13……TFT基板、14……液晶組成物、20……分液ロート、21……水層、22……液晶層、23……コック[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal recovery method, and more particularly to a liquid crystal recovery method for recovering a liquid crystal composition from a liquid crystal panel incorporated in a used product.
[0002]
[Prior art]
In recent years, waste and global environmental issues have attracted attention, and the transition from the conventional mass production, mass consumption, and mass disposal economic systems to the resource recycling economic system has become an important social issue. According to the Basic Law for the Promotion of Recycling-Oriented Society (Promulgated on June 2, 2000), which has legalized the priority of treatment, 1. Waste generation reduction (reduction) 2. Reuse (reuse) 3. Reuse Resource recycling (material recycling), 4. Thermal recycling, 5. Appropriate disposal.
[0003]
Currently, for example, in the case of television, recycling of home appliances is a recycling technology that cuts the CRT (Cathode Ray Tube) glass to remove the electron gun and phosphor, and then recycles it into the original CRT glass as a glass cullet. Is already being put to practical use.
[0004]
On the other hand, liquid crystal panels, which are the same display devices as televisions contained in wastes such as electronic devices and information devices, are still crushed together with products in processing facilities due to the relatively small amount of wastes. In the present situation, landfill processing is performed together with the above, or landfill processing is performed after incineration processing, and resources such as liquid crystal compositions are not effectively used.
[0005]
However, liquid crystal panels are display devices that can contribute not only to power saving but also space saving. In recent years, the production volume has increased rapidly with the rapid spread of information devices such as personal computers. Recycling technology is urgently required.
[0006]
As a technology related to liquid crystal panel recycling, JP-A-2000-24613 discloses a method of recycling glass cullet after the waste liquid crystal panel is heated to 450 to 650 ° C. to gasify and remove organic substances provided in the liquid crystal panel. ing.
[0007]
Japanese Laid-Open Patent Publication No. 2000-51829 discloses a method for recovering recyclable glass by putting waste of a liquid crystal display device into a fluidized bed in which a solid heat medium is flowing.
[0008]
Furthermore, Japanese Patent Application Laid-Open No. 2000-84531 discloses a method in which a waste liquid crystal panel is sheared and destroyed, and then introduced into a non-ferrous smelting furnace at about 1200 ° C., and the glass is used for removing iron in the non-ferrous smelting furnace.
[0009]
Japanese Patent Laid-Open No. 2000-189939 discloses a method of recycling a liquid crystal display to glass cullet or the like by crushing the liquid crystal display followed by high-temperature heat treatment and then solvent treatment.
[0010]
[Problems to be solved by the invention]
However, these technologies are characterized in that the entire waste liquid crystal panel is first subjected to a high temperature treatment. For this reason, enormous energy and large-scale equipment are required for the treatment, and the efficiency for recycling is not necessarily considered the best. In many technologies, the main focus is on recycling the glass constituting the liquid crystal panel, and there is no example of collecting and recycling the liquid crystal composition from the liquid crystal panel.
[0011]
In general, liquid crystal compositions are known to be arbitrarily dissolved in organic solvents such as alcohol and acetone. Recovery of liquid crystal compositions from liquid crystal panels can also be achieved by dissolving them in these organic solvents after separation or crushing. Easy to come up with.
[0012]
However, when these organic solvents are used, it is necessary to distill by heating to separate the dissolved liquid crystal composition, which is not only dangerous but also requires a lot of energy. In addition, there is a possibility that the environmental load in the recycling process increases due to the treatment of the organic solvent used.
[0013]
Furthermore, since many impurities easily dissolve in the organic solvent, it is expected that the recovered liquid crystal composition will be extremely difficult to purify.
The present invention has been made in view of these points, and an object of the present invention is to provide a liquid crystal recovery method for recovering a liquid crystal composition from a used liquid crystal panel safely and economically.
[0014]
[Means for Solving the Problems]
According to the present invention, in the liquid crystal recovery method for recovering a liquid crystal composition a liquid crystal panel, a glass substrate constituting the liquid crystal panel peeling or crushed, and soaked in hot water, the liquid crystal composition to the hot water dissolved in a solution, the solution was cooled at room temperature until the said liquid crystal composition is separated and recovered from the solution, the hot water to dissolve the liquid crystal composition specific resistance 13MΩ · cm or more, metal There is provided a liquid crystal recovery method characterized by being pure water having ions of 0.2 ppb or less, and simultaneously removing ionic impurities from the liquid crystal composition during dissolution and separation of the liquid crystal composition .
[0015]
Since water is used for dissolving the liquid crystal composition, it is safe and easy to handle. Further, since impurities are less soluble than organic solvents, it is possible to recover a liquid crystal composition with few impurities. Furthermore, it is economical because it does not require large-scale equipment for collecting and treating the organic solvent, and the liquid crystal composition can be collected without imposing a burden on the environment.
[0016]
Further, as the water used for the dissolution, for example, pure water having a specific resistance of 13 MΩ · cm or more and a metal ion of 0.2 ppb or less is used to simultaneously remove ionic impurities from the liquid crystal composition during dissolution and separation. Is possible.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing a liquid crystal recovery method according to an embodiment of the present invention.
[0018]
The glass substrate constituting the liquid crystal panel is peeled off or crushed (S1), the liquid crystal composition sealed between the glass substrates is exposed to the outside, and this is immersed in hot water so that the liquid crystal composition in the liquid crystal panel Is dissolved (S2). The solution in which the liquid crystal composition is dissolved is recovered (S3) and cooled (S4), and then the water and the liquid crystal composition are separated (S5), and the liquid crystal composition is recovered (S6).
[0019]
Next, the configuration of the liquid crystal panel will be described. FIG. 2 is a schematic sectional view of the liquid crystal panel.
A color filter substrate 11 having a black mask, a color filter, a transparent conductive film, a liquid crystal alignment film and the like formed on the inner surface is covered with a TFT (Thin Film Transistor), signal line, and transparent electrode on the inner surface by a sealing material 12 made of an epoxy adhesive or the like. The liquid crystal alignment film is bonded to the TFT substrate 13. A liquid crystal composition 14 is filled between the color filter substrate 11 and the TFT substrate 13 which are bonded to each other to form the liquid crystal panel 10.
[0020]
Next, the solubility of the liquid crystal composition in pure water will be described. Table 1 shows the results of examining the solubility of liquid crystal compositions in pure water for liquid crystal compositions A and B used in typical nematic liquid crystal material ZLI-4792 manufactured by Merck Japan and TFT-type liquid crystal panels. The specific gravity of each liquid crystal composition is 1.049, 1.11 and 1.12.
[0021]
[Table 1]
Figure 0004374772
[0022]
Each liquid crystal composition is arbitrarily or partially dissolved when the temperature of pure water is 80 ° C., and each liquid crystal composition is arbitrarily dissolved when the temperature of pure water is 90 ° C. or higher. Therefore, the temperature of pure water for dissolving the liquid crystal composition is desirably 80 ° C. or higher.
[0023]
Next, a method for recovering the liquid crystal composition will be described. FIG. 3 is a schematic cross-sectional view of a separatory funnel for recovering the liquid crystal composition 14.
The separating funnel 20 can separate and discharge the liquid separated into a plurality of layers by opening and closing the cock 23. After the solution in which the liquid crystal composition 14 is dissolved is cooled and separated into the water layer 21 and the liquid crystal layer 22, the cock 23 is operated on the separated water layer 21 and the separated liquid crystal layer 22 to operate the liquid crystal composition 14. Only the liquid crystal layer 22 containing is recovered.
[0024]
Next, a procedure for carrying out the present invention will be described.
The color filter substrate 11 and the TFT substrate 13 constituting the liquid crystal panel 10 are peeled off or crushed to expose the liquid crystal composition 14 sealed between the color filter substrate 11 and the TFT substrate 13 to the outside. This is immersed in a container containing pure water heated to 80 ° C. or higher to dissolve the liquid crystal composition 14 in pure water. This operation is repeated, and when a predetermined amount of the liquid crystal composition 14 is dissolved, the solution is recovered and cooled. The solution is transferred to the separating funnel 20 and allowed to stand, and after waiting for separation into the aqueous layer 21 and the liquid crystal layer 22, the separated liquid crystal layer 22 is recovered by the separating funnel 20.
[0025]
In many cases, the liquid crystal composition 14 used in the TFT type liquid crystal panel has a specific gravity greater than 1. In the above description, the water layer 21 is shown in the upper layer of the separating funnel 20 and the liquid crystal layer 22 is shown in the lower layer. . Depending on the type of liquid crystal, a liquid crystal layer may be separated into an upper layer and an aqueous layer may be separated into a lower layer.
[0026]
Next, a case where the embodiment of the present invention is applied to a 15-type (diagonal 38 cm) TFT liquid crystal panel used in a liquid crystal monitor for a personal computer will be described as an example.
[0027]
A liquid crystal composition is recovered from a 15-inch (38 cm diagonal) TFT liquid crystal panel used in a liquid crystal monitor for a personal computer.
First, after removing the extracted polarizing plate and the circuit board on which the driving IC is mounted using a cutter or the like, the front and back sides of the liquid crystal panel 10 are divided into approximately six parts using glass cutting. Scratch the glass surface and cut the glass. Similarly, after cutting 20 LCD panels, put them in a 5-liter glass beaker, pour 2 liters of pure water with a specific resistance of 13 MΩ · cm or more and metal ions of 0.2 ppb or less, and then heat it with an electric stove. Heat for 10 minutes while adjusting to 90-95 ° C.
[0028]
After the glass is removed from the beaker, it is naturally cooled, and when the temperature is close to room temperature, the supernatant water is removed by decantation until the remainder reaches about 100 ml. Then, the mixed liquid separated into the water layer and the liquid crystal layer in the beaker is transferred to a separating funnel 20 having a volume of 200 ml. The separatory funnel 20 is shaken lightly to stir the liquid in it, and then left to stand. After being separated into the water layer 21 and the liquid crystal layer 22, the cock 23 of the separatory funnel 20 is opened and only the liquid crystal layer 22 is recovered. To do.
[0029]
Thus, the amount of the liquid crystal composition recovered from 20 15-type liquid crystal panels by the above method is 7.6 g, and the liquid crystal composition has a high recovery rate corresponding to 95% of the theoretical recovery amount calculated from the panel area. You can get things.
[0030]
Further, the specific resistance is 12.5 MΩ · cm, which is a level with no practical problem.
The above structure is an example of a TFT-type liquid crystal panel that is now becoming mainstream, but the present invention is not limited to this structure, and the conventional STN (Super Twisted Nematic) system, TN (Twisted Nematic) system, etc. It can also be applied to other liquid crystal panels.
[0031]
【The invention's effect】
As described above, in the present invention, the liquid crystal composition is dissolved in hot water, and the liquid crystal composition is separated and recovered after cooling, so that no large-scale equipment is required, and it is safe and has an impact on the environment. Therefore, the liquid crystal composition can be recovered and recycled from the liquid crystal panel.
[0032]
In particular, since pure water is used without using an organic solvent, a large facility for collecting and treating the organic solvent is not required. Further, it becomes possible to recover a liquid crystal composition with few impurities.
[0033]
In addition, the liquid crystal composition can be recovered from the used liquid crystal panel at a high recovery rate, and can be used for recycling.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram of a liquid crystal recovery method according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a liquid crystal panel.
FIG. 3 is a schematic cross-sectional view of a separatory funnel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Liquid crystal panel, 11 ... Color filter substrate, 12 ... Sealing material, 13 ... TFT substrate, 14 ... Liquid crystal composition, 20 ... Separation funnel, 21 ... Water layer, 22 ... Liquid crystal layer , 23 …… Cock

Claims (2)

液晶パネルから液晶組成物を回収する液晶回収方法において、
前記液晶パネルを構成するガラス基板を剥離または破砕し、
熱水中に浸漬し、前記液晶組成物を前記熱水に溶解して溶解液とし、
前記溶解液を室温まで冷却し、
前記液晶組成物を前記溶解液から分離回収し、
前記液晶組成物を溶解させる前記熱水は比抵抗が13MΩ・cm以上、金属イオン0.2ppb以下の純水であり、前記液晶組成物の溶解及び分離時にイオン性不純物を前記液晶組成物から同時に除去する、
ことを特徴とする液晶回収方法。
In a liquid crystal recovery method for recovering a liquid crystal composition from a liquid crystal panel,
Peeling or crushing a glass substrate constituting the liquid crystal panel,
It was immersed in hot water, and solution by dissolving the liquid crystal composition to the hot water,
The solution was cooled at room temperature until a
Separating and recovering the liquid crystal composition from the solution ,
The hot water for dissolving the liquid crystal composition is pure water having a specific resistance of 13 MΩ · cm or more and metal ions of 0.2 ppb or less, and ionic impurities are simultaneously dissolved from the liquid crystal composition during the dissolution and separation of the liquid crystal composition. Remove,
A liquid crystal recovery method characterized by the above.
前記熱水の温度は80℃以上であることを特徴とする請求項1記載の液晶回収方法。  The liquid crystal recovery method according to claim 1, wherein the temperature of the hot water is 80 ° C. or higher.
JP2000364912A 2000-11-30 2000-11-30 Liquid crystal recovery method Expired - Lifetime JP4374772B2 (en)

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JP4940531B2 (en) * 2002-09-26 2012-05-30 Dic株式会社 Treatment method for reusing liquid crystal materials
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CN100417982C (en) * 2005-10-18 2008-09-10 比亚迪股份有限公司 A recycled method of mixed liquid crystal reclaimed from production line
JP4740362B2 (en) * 2008-08-11 2011-08-03 財団法人工業技術研究院 Liquid crystal recovery method and apparatus for LCD waste panel
JP5385924B2 (en) * 2009-02-04 2014-01-08 公立大学法人大阪府立大学 Separation and recovery method of glass and transparent electrode material from liquid crystal panel
TWI458570B (en) * 2011-12-07 2014-11-01 Ind Tech Res Inst Method of reusing micro-encapsulated cholesteric liquid crystal
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