利用助剂改善高得率浆纤维的结合强度

Using Different Additives to Improve the Inter-fiber Bonding Strength of HYP

关键词:  高得率浆(HYP)  两性聚丙烯酰胺(AmPAM)  阳离子型微纤化纤维素(CMFC)  阳离子淀粉(CS)  结合强度

Key Words:high yield pulp (HYP)  amphoteric polyacrylamide (AmPAM)  cationic microfibrillated cellulose (CMFC)  cationic starch (CS)  bonding strength

摘要:实验采用不同类型助剂(两性聚丙烯酰胺(AmPAM)、阳离子淀粉(CS)和阳离子微纤化纤维素(CMFC))改善高得率浆（HYP）纤维的结合性能和物理强度,同时尽可能保持其较高松厚度的优势；分析了通过改良助剂添加方式（将助剂先加入HYP中，后与化学浆混合）来改善含HYP纸料的结合性能。结果表明，传统增强剂(强阳离子AmPAM和增强型CS)的增强效果最好,但松厚度下降显著；新型增强剂(CMFC、中性AmPAM、低相对分子质量高取代度阳离子淀粉(LHCS)和聚酰胺 环氧氯丙烷树脂（PAE）)的增强效果次之,但对松厚度影响较小。其中,在保持相近松厚度的前提下,CMFC对HYP纤维的增强效果好于增强型CS。改良助剂添加方式的研究结果表明，几种助剂对混合纸料的影响趋势与单独加入HYP的相似,CMFC、LHCS和PAE均可以在松厚度下降幅度较小时,提高纸张抗张强度。

Abstract:Different kinds of chemicals, including amphoteric polyacrylamide (AmPAM), cationic starch (CS), and cationic microfibrillated cellulose (CMFC), were used in this paper to improve the inter-fiber bonding capacity and physical strength properties of poplar P-RC APMP with few sacrifice of its high bulk. The results showed that the traditional chemicals (positive AmPAM and CS) had the best strength improvement for HYP handsheets, but the bulk decreased dramatically. The new kinds of chemicals, which included CMFC, neutral AmPAM, and LHCS cationic starch with low relative molecular weight and high sufortution degree, had the positive effect on the strength properties and bulk. Furthermore, the addition modes of chemicals were modified to enhance the bonding properties of HYP-containing pulps, that was the chemicals were first added into the HYP, then the HYP was mixed with chemical pulp. The results showed that there were similar trends of strength improvement for two kinds of conditions (the HYP-containing pulps and HYP only). The CMFC, LHCS and PAE could improve the tensile strength properties of HYP-containing papers in different degrees with maintaining less decrement of bulk.