阳离子壳聚糖衍生物的合成及其在中性施胶中的应用

Synthesis of Cationic Chitosan Derivates and Its Application in Neutral Sizing

由水溶性壳聚糖与不同物质的量之比的丙烯酰胺和甲基丙烯酰氧乙基三甲基氯化铵的混合溶液接枝共聚合成了阳离子壳聚糖.使用阳离子壳聚糖乳化AKD,用制备的AKD乳液分别对针叶木浆、阔叶木浆以及混合浆进行中性施胶,测定所得纸张的施胶度.施胶剂的用量占绝干浆的0.2%、0.3%和0.4%.通过研究施胶度的不同变化趋势,分析单体物质的量之比、熟化时间、浆种以及施胶量对施胶度的影响.研究表明,由改性的阳离子壳聚糖衍生物制备的AKD乳液能使纸张获得良好的施胶度,熟化时间比较短.阳离子壳聚糖衍生物可作为一种环保材料用于对纸张施胶.

Cationic chitosan derivates was synthesized with water-soluble chitosan, acrylamide （AM ） and methacrylic acid ethyl trimethylammonium chloride （ DMC ） by graft copolymerization, and it was used to make cationic AKD emul- sion. Hardwood pulp, soft wood pulp and their mixed pulp were used to test the sizing effect of the AKD emulsion. And the paper sizing degree was measured when the ratio of size accounts and dry pulp in 0.2%, 0.3% and 0.4%. The effects of mono- mer ratio （ hAM ： nOMC ） and the curing time on its sizing performance were discussed. Preliminary studies indicate that using the cationic chitosan improve the sizing performance of the AKD emulsion and shorten its curing time. The AKD emulsion which is prepared by cationic modified chitosan derivatives can be used as an environmentally friendly material for the paper sizing.