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標題: 影印廢紙脫墨之研究
Study on De-inking of Xerography Wastepaper
作者: 劉仁煥
Liu, Rheng-Huan
關鍵字: wastepaper;廢紙;de-inking;toner;surfactant;solubility parameter;plastic films;emulsion;adsorption;脫墨;油墨;界面活性劑;溶解度參數;塑膠片;乳液;吸附
出版社: 化學工程學系所
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本研究在於探討影印廢紙實用的脫墨再生方法, 藉由估計碳粉中熱塑性塑膠的溶解度參數,進而選擇調配適當的溶劑以作為紙漿水溶液中的脫墨劑。紙漿水溶液中的油墨可藉由乳化法來分離,塑膠片吸附法的分離效果更為顯著。
在乳化法中,主要的脫墨劑是由合適的有機溶劑和界面活性劑所組成,這有機溶劑是水不溶性的,而且它的溶解度參數和油墨中的塑膠成分很相近,因此彼此在接觸的初期就可迅速的溶解,接著已添加在內的界面活性劑可促進它形成安定的乳液且可容易的洗掉。在本研究中最佳的脫墨劑是由水不溶性的naphthalene (20%)、isoamyl acetate (80%) (NAISA20)及界面活性劑 (LAUEO3, Lauryl alcohol polyethylene glycol)所組成。在20℃下,本研究中所採用的影印油墨(styrene-acrylate copolymer)可以快速的乳化成粒徑為527nm的安定乳液,這脫墨後的紙漿經過重複的洗滌,脫墨漿中的殘墨量可由5760 ppm降至10 ppm以下,同時,白度則由80%GE增至85%GE,幾乎達到原紙白度的86%GE。
在進ㄧ步的塑膠片吸附法之研究中,用合適的溶劑和界面活性劑混合成的脫墨劑,可使油墨生成黏滯性的液體,在室溫中可被吸附在塑膠片上,然後再藉由篩選而加以分離。在本階段中的最佳脫墨劑成分與前項試驗內容的乳化法相似,但用量較少,在20℃下,7分鐘內只有使用0.8 wt%NAISA20 (一種溶劑混合物)及0.3 wt%LAUEO3 (月桂醇聚氧乙烯:一種界面活性劑)即可得到頗高的脫墨效率。在本研究中,不使用洗滌法而使用PET塑膠片吸附油墨,結果經由2次的處理,脫墨紙漿中的殘墨量可由67900 ppm降至12 ppm以下(99.98%的油墨移除率),脫墨紙漿的白度則增至85%GE,此高品質的再生紙已達到再用於印刷用紙的標準。
其他識別: U0005-1406200914332300
Appears in Collections:化學工程學系所

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