The Repulping of Epoxide-Containing Wet-Strength Handsheets

由於造紙纖維之短缺及環保壓力，促使造紙者對廢紙之利用多加關注，尤以來自台長纖維之濕強紙之回收為最。由於添加合甲醛樹脂之濕強紙有害人之健康，故濕強紙多採不會甲醛之PAE（含epichlorohydrin成分之樹脂）濕強劑。此類樹脂之濕強效果雖佳，但回收時，若採傳統之氫氧化納及次氯酸鹽(NaOCl)處理時，紙纖維不易打散，是其缺點。本研究擬在不同條件下，以不同氧化劑處理合環氧樹脂濕強紙之回收散漿試驗，以了解何者之散漿較優。由七種試驗結果知，二段次氯酸鹽，過氧化氫之散漿效果（以可接受分散纖維收率、紙力及自度評定之）最佳；次為分二段添加之過氧化氫處理（可增加收率）；以次氯酸鹽妥善處理可改善回收紙之紙力。

關鍵字

散漿；濕強紙； PAE樹脂；環氧樹脂；氧化性散漿助劑

並列摘要

Shortages in natural fiber resources and environmental pressure have driven the paper industry to take a hard look at utilizing a variety of waste papers, particularly wet-strength papers which are ordinarily made from strong, high-quality pulp fibers. Since the recognition of a link between formaldehyde and canccer，PAE wet-strength resins have increasingly replaced the use of formaldehyde-based resins. Wet-strength papers with PAE resins are more permanent and are difficult to repulp with conventional repulping chemicals - caustic (NaOH) and hypochlorite (NaOCI).In this study, the repulping of epoxide-containing wet-strength handsheets with various oxidants under different conditions was investigated in the laboratory. Among the seven repulping methods investigated; NaOCl and H_2O_2 at two-pH stage proved to be the most promising. H_2O_2 use at two-pH stage results in increased repulping yields and the NaOCI improves dry strength response from recycled fibers.

並列關鍵字

Repulping ； Wet-strength paper ； PAE resins ； Epoxide resins ； Oxidant repulping aids

國際替代計量

The Repulping of Epoxide-Containing Wet-Strength Handsheets

未授權

主題瀏覽