A Study of Removing Iodine and Boron Contents in Waste Polarizer Products

• Main Authors: Chih-Ling Chen, 陳志凌
• Other Authors: 柯明賢
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/35xjzm

碩士 === 國立臺北科技大學 === 資源工程研究所 === 105 === With the increasing of TFT-LCD application, there is the rapid development of TFT-LCD industry in Taiwan. The components of polarizer products produced from the manufacture were composed of polyethylene terephthalate (PET) surface protective film, pressure-sensitive adhesive (PSA), triacetate cellulose (TAC) or PET protective film, dyed polyvinyl alcohol (PVA) polarizer film, and PET release film. Currently, the main manufacturing process of polarizer is that PVA soaks in iodine/potassium iodide aqueous solution to form polarizer film. The polarizer product and TFT-LCD factory would produce a large amount of waste polarizer products. The waste polarizer products were mainly treated by landfill or incineration, but the iodine and boron contents in PVA would cause secondary pollution during landfill or incineration. Therefore, the aim of this study was to study on the feasibility of removing iodine and boron from waste polarizer products. In this study, the two stage of treating processes individually including soaking and dissolving were used to remove iodine and boron contents in waste polarizer products. The effect of liquid-solid ratio, concentration of soaking or dissolving solution, reaction time and reaction temperature on the removal efficiency of iodine and boron in waste polarizer products would be investigated. The results showed that the optimum operation parameters for soaking process were reaction temperature 50℃, concentration of soaking solution 15%, reaction time 120 minutes and L/S ration 4. As for the dissolving process, the optimum operation parameters were reaction temperature 60℃, concentration of washing solution 4%, reaction time 120 minutes and L/S ration 5. Moreover, the removal efficiency of iodine and boron in waste polarizer products would respectively reach 87% and 97% after two stage of soaking and dissolving processes.