陰離子性丙烯醯胺樹脂之製備及其在造紙上的應用

Preparation of, Anionic Acrylamide Resins and Their Applications in Papermaking

谷雲川(Y. C. Ku) ； 潘登灶(T. T. Pan) ； 王國財(K. T. Wang)

《林產工業》 2卷2期 (1983/06) Pp. 32-45

摘要

紙張強度可經由精鍊作用予以控制，有些場合可藉化學添加物達到同樣目的，因為精鍊作用同時使紙張之密度、不透明度及透氣度等性質發生變化。本試驗即擬合成一為紙張乾強之促進而設計的乾強樹脂，此樹脂係以丙烯醯胺為基材，同時以丙烯醯與之共聚合而使該樹脂帶陰離子佳，藉明礬之作用而定著於紙漿纖維上；增加和／或增強纖維間之鍵結，達到紙力增強之目的。造紙過程中的一些因子常影響樹脂的添加效果，在這見我們討論明礬使用量、樹脂添加順序、接觸時間、漿料溫度、乾燥溫度及打漿程度等變因對樹脂使用效果之影響。同時，我們探討該樹脂對促進紙強乾強以外的效應，諸如樹脂對漿料游離度、紙張灰分及上膠度等性質之影響。試驗中並收集數種市售乾強劑以資比較。我們發現該樹脂不僅對紙張乾強性質之促進效果良好，同時也促進紙張上膠度及填料之保留。

並列摘要

Acrylamide-acrylic acid copolymers designed for improving paper strength have been synthesized in our laboratory. They were prepared in aqueous solution at 10% concentration, using potassium persulfate as the initiator. The degree of polymerization were controlled by adding various amounts of isopropyl alcohol. The molecular weights of resins were not determined. They were, however, characterized by the Brookfield viscosities. The waste carton pulps and mixed bleached pulps were used as stock. The influences of papermaking variables such as the amount of resin, the alum dose, the .order of addition, the contact time, the stock temperature, the drying temperature and the degree of pulp refining have been considered. The efficiencies of our anionic acrylamide-based resins and four marketed dry strength resins have also been compared as shown in Fig. 3 and Fig.4. It is quite apparent that the alum dose are vital to the activity of the acrylamide acrylic acid resin in papermaking stock (Fig. 5). The highest strength was found at 0.7~1.0% alum dose as a result of producing optimum retention, conditions for the resin. The effect of the order of addition is shown in Fig.6 and 7, and it is concluded that the resin may be added before the alum to get a higher ring crush resistence. The optimum contact time was found to be between 30 to 60min. The higher stock temperature improved dry strength properties of paper as shown in Fig.8 and Fig.9. When the burst strength was considered, there was not somuch difference with regard to drying temperatures (Fig. 10), but the drying temperatures have a significant influence on the resistence devel-opment of ring crush (Fig 11). The application of about 0.4% of anionic acrylamide resin based on the dry pulp improvod the burst index of a less refined pulp (585mi, C. S. F.) to 23% higher than of a more refined pulp (355mI., C. S. F.) as Shown in Fig. 12. The papersheet made from weaker stock might also be made to the same burst as the papersheet made with stronger stock, which is a result of using the resin. When the resin was used in clay-filled paper, the paper strength properties such as the burst, the tensile and the folding endurance, being related to better fiber-to-fiber bonding, underwent a large improvement. The tear strength which is sometimes adversely affected by the increased bonding, was affected by the addition of resin in a different manner from the burst, the tensile and the folding Endurance. The addition of resin was found to reduce the tear resistence (Fig. 14). It was found that an increasing amount of resin increased the retention of clay in the sheet slightly. The resurts from sizing tests showed that the resin applied did not work merely as a dry strength additive put also play the role as a sizing promoter.