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Research on Method of Recycling Liquid Crystal from Wasted LCDs

Author: ZhuHuBing
Tutor: LiuGuangFu
School: Hefei University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: LCD Display screens Liquid crystal Recycle Supercritical fluid Ultrasonicwave Performance test
CLC: X705
Type: Master's thesis
Year: 2013
Downloads: 46
Quote: 0
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Abstract


With the rapid development of liquid crystal display industry and constant update of display technology, the amount of wasted LCD screens is increasing year by year. There are high-value liquid crystal material and rare-precious metal indium in the wasted LCD screens. Recycling and reusing the liquid crystal material in the wasted LCDs have attracted many domestic and foreign research institutions. Taking TN-TFT LCD screens as studying objects, the method for recycling liquid crystal based on supercritical fluid technology was proposed. The dissertation mainly focused on the method of recycling liquid crystal, using organic solvents to dissolve LCD screens with the aid of ultrasonic wave, collecting liquid crystal through membrane filtration and vacuum distillation.The principle of recycling liquid crystal based on supercritical fluid technology(SCF) was analyzed, the influence factors of recycling liquid crystal by SCF was pointed out and the testing system of recycling liquid crystal through SCF was established.The recycling tests of liquid crystal were carried out through organic solvents dissolving LCD screens with ultrasonic wave. The purity and phase-transition of the collected liquid crystal were analyzed and the characteristic parameters were measured. The testing results of the collected liquid crystal were compared with that of the pure material, and the reusing value was estimated. The testing results indicated that the recovery rate of the liquid crystal could reach50%through above method, the collection had evident characteristics of liquid crystal and showed a wide nematic phase temperature interval and high clearing point. The purity of the collected liquid crystal, however, was not high enough to satisfy the requirements of purity for watching (GCMS>99%), despite the fact that its response time of33.2ms meets the demand of LCDs. Although the dielectric coefficient of4.71and refractive index of0.089were a little lower than that of the pure material, the liquid crystal could still satisfy the requirements of the standard AM-LCD parameters. The threshold voltage of3.2V was higher than that of the pure liquid crystal, but it could be lowered by removing the ionic impurities.Liquid crystal could be recycled effectively from the wasted LCDs through the method mentioned above. The recovery liquid crystal could be used in conventional displaying mode after being purified. It has great significance to the development of cyclic economy, reducing the environment pollution and realizing the circulative utilization of resources.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Solid waste disposal and utilization
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