Effects of Adding Polyelectrolyte Complexes to the Papermaking Wet End on Paper Strength and Functionality

本試驗以改善回收漿（OCC）的強度性質為主要目標，主要以陽性聚丙烯醯胺（cPAM）、澱粉配合陰性（aPAM）及澱粉，藉由改變各種濕端條件及添加模式，以期達到顯著增加回收漿紙力強度的目的，同時考慮濾水性質、成本及操作的方便性。試驗結果顯示cPAM之Percol 182對紙張抗張強度、破裂強度、耐摺力有最佳促進效果，兩性PAM之Hercobond 6350及PS 1280次之，aPAM之Percol 155其抗張指數僅高於陰性澱粉，但破裂指數卻是最低；而撕裂指數又以PS 1280最高。對濾水性的影響隨聚電解質種類及添加量而異，Percol 182明顯提高游離度，Hercobond 6350次之，Percol 155明顯減低游離度。當固定陽性PAM及陽性澱粉而變化兩性或陰性PAM及澱粉添加量時，紙張強度依各聚電解質有所不同。漿濃度為1.00%時，抗張指數以Percol 182添加量為1.00%時為最佳，但在考慮經濟成本下，在陽性澱粉及Percol 155添加量為0.75/0.25%時亦可提升紙張之抗張指數。撕裂指數以陽性澱粉及PS 1280添加至0.25/0.75%及0.50/0.50%時為佳，但在考慮成本下，則以陽性澱粉及陰性澱粉添加至0.75/0.25%及0.50/0.50%為最適化添加。

關鍵字

回收紙漿；界達電位；聚電解質複合物；留存與濾水

並列摘要

The main purpose of the study was to find ways of strengthening paper made from old corrugated containerboard (OCC) using the addition of cationic polyacrylamide (cPAM) and starch (CS) in conjunction with anionic PAM (aPAM) and starch (AS). Through modifying the wet-end conditions and modes of addition, we searched for optimal conditions to enhance paper strength, while in the meantime considering estimates of the drainage performance, production cost, and machine runnability. The results indicated that Percol 182, a cPAM, had the best enhancing efficacies on the tensile, burst, and folding strengths of the resulting paper. The amphoteric PAMs, Hercobond 6350 and PS 1280, had slightly inferior performances. While the aPAM, Percol 155, contributed to the tensile strength that was only better than an anionic starch, which had the worst burst strength. The tearing strength was highest when PS 1280 was used. Drainage effects of the additives differed according to the type and dose of the polyelectrolyte. Percol 182 significantly increased the freeness of the pulp, allowing water to drain faster. Hercobond 6350 was next, while Percol 155 significantly decreased the freeness of the pulp. When applying a fixed cPAM and CS to moderate the doses of an amphoteric PAM or aPAM, paper strengths varied with the polyelectrolyte complex used. For paper tensile strength, a pulp concentration of 1.00% and a tensile index Percol 182 dose of 1.00% were optimal, and the tensile indices of the resulting handsheets were optimized. However, when the cost factor was considered, then sequential CS/Percol 155 addition at a 0.75/0.25% dose was effective in elevating the tensile performance. For tearing strength, the sequential addition of CS with PS 1280 at doses of 0.25/0.75% and 0.50/0.50% was better. When cost was considered, adding CS and AS sequentially at a 0.75/0.25% or 0.50/0.50% dose was optimal for strength enhancement.

並列關鍵字

recycled pulp ； zeta potential ； polyelectrolyte complex ； retention ； drainage

國際替代計量

Effects of Adding Polyelectrolyte Complexes to the Papermaking Wet End on Paper Strength and Functionality

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