大豆基高聚物纸张干强剂的合成与表征

Synthesis and characterization of a new soy-based derivative paper strengthening agent

开发了一种全新的大豆(大豆粉)衍生物,将其用于提高纸页空间结构中纤维间的结合强度。为了显著提高纸页纤维间的结合,这项研究成功地将羧酸和/或胺类官能团接枝到大豆粉聚合物的主链上。在次磷酸钠存在下,DTPA与大豆粉反应并与壳聚糖复合成为一种新型干强剂,从而提高了纸浆纤维间的结合强度。此外,文中对改性剂的用量、时间、温度、pH值、料液比等合成条件都进行了优化。本文首次证明了DTPA交联(改性)大豆粉可以提高纸张抗张强度。结果表明:与原样品相比,将1%的大豆粉-DTPA-壳聚糖在纸页成形前分别与旧瓦楞纸浆、中性亚硫酸盐半化学浆、硫酸盐浆充分混合,纸页的抗张指数分别增加了52.6%,53%,57.8%,经改性的大豆粉处理过的纸页由于其表面粗糙度降低而具有防水性,且显著改善纸张光泽度。

The goal of the current effort was to develop a new soy-based（soy flour） derivative to impart high fiber-fiber strength improvements to two-dimensional paper sheets.The success of the research hinged on successful proliferation of carboxylic and/or amine functionalities onto the polymeric backbone of the soy flour to significantly contribute to improved interfiber bonding of the paper-fiber sheets.Diethylenetriaminepentaacetic acid（DTPA） was reacted with soy flour in the presence of sodium hypophosphite and complexed with chitosan for the development of a new class of dry strength agents to improve integration into pulp fibers and thus increase interfiber bonding.The synthetic conditions including surface modifier concentration,time,temperature,pH,and material-to-liquor ratio were optimized.The paper materials incorporating the DTPA cross-linked（modified） soy flour agent demonstrated unprecedented tensile strength increases.A 1%soy protein flour-DTPA--chitosan agent by mass of pulp based slurry was thoroughly mixed before generating two-dimensional hand sheets whose tensile indices increased 52.6%,53%,57.8%for recovered（OCC,old corrugated containerboard）,NSSC（virgin） pulp,and kraft（virgin） pulp sheets,respectively.The modified soy flour agent-treated pulp sheets also provided significantly increased gloss and water repellency with diminished surface roughness.