Method and system for recovering crystal liquid in abandoned liquid crystal display

A liquid crystal display and recovery system technology, applied in the direction of liquid crystal materials, chemical instruments and methods, solid waste removal, etc., can solve the problem of not using supercritical fluid to extract liquid crystals, and achieve easy control of extraction parameters, saving manufacturing costs, Good effect of environmental protection characteristics

Inactive Publication Date: 2012-06-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no implementation method and special equipment for extracting liquid crystals using supercritical fluids so far.

Method used

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  • Method and system for recovering crystal liquid in abandoned liquid crystal display
  • Method and system for recovering crystal liquid in abandoned liquid crystal display

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Experimental program
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Embodiment Construction

[0030] The characteristics of the method for liquid crystal recovery in the waste liquid crystal display screen in the present embodiment are to carry out as follows:

[0031] 1. Disassemble the liquid crystal display, separate the liquid crystal cell, cut off the side glass with the sealant around the liquid crystal cell, take the liquid crystal glass substrate, and separate the two glass substrates of the liquid crystal cell with sharp-nosed tweezers, and the separated glass The substrate is placed in a closed extractor in layers, and the extractant CO is introduced into the extractor. 2 , so that the extractant fully contacts with the liquid crystal glass substrate;

[0032] available in CO 2 An entrainer is added to the extractant at a mass percentage of 1% to 5%, and the entrainer is C 1 ~C 4 Alcohols, alkyl ethers or esters; preferably ethanol, methyl ether or ethyl acetate;

[0033] 2. The process conditions for setting the airtight extractor are: make the extractan...

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Abstract

The invention discloses a method and a system for recovering crystal liquid in an abandoned liquid crystal display. The method is characterized in that a liquid crystal glass substrate is placed in a sealed extractor; extracting agent CO2 is introduced in to ensure that the extracting agent and the liquid crystal glass substrate fully contact; the technical condition of the sealed extractor is set to cause the extracting agent CO2 to achieve the supercritical fluid status; liquid crystal on the glass substrate is fully dissolved by the supercritical CO2 fluid; pressure is lowered to cause the supercritical fluid dissolved with liquid crystal to enter a sealed separator; the extracting agent CO2 in the supercritical fluid is converted into gas, and the liquid crystal is converted into liquid; and gaseous extracting agent CO2 and liquid crystal are respectively collected. The method and the system are economic and environmentally-friendly, have low energy consumption, and can be industrially applied to the recovery of the liquid crystal in the abandoned liquid crystal display.

Description

technical field [0001] The invention relates to a device for recovering liquid crystals from waste liquid crystal displays. Background technique [0002] Liquid crystal is a kind of polymer material. Because of its special physical and chemical properties and optical properties, it has been widely used in thin and light display technology since the middle of the 20th century. Liquid crystal display (LCD) has the advantages of small size, micro radiation, low power consumption, and more display information, and is widely used in electronic and electrical products such as TVs, computers, mobile phones, GPS, PDAs, game consoles, automobiles, and instruments. According to foreign research reports, the sales volume of small and medium-sized LCD screens in the world was 3.8 billion in 2007, and it is expected to grow to 4.5 billion by 2011. Liquid crystal display screens are generally used in electronic and electrical products with a faster replacement speed, and their life cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02B09B3/00C09K19/00
CPCY02P20/54Y02W30/20
Inventor 王玉琳朱虎兵宋守许刘志峰刘光复
Owner HEFEI UNIV OF TECH
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