基于阳离子聚合物和纤维素纳米纤丝的二元纸张增强体系

Reinforcing Paper Strengths by Dual Treatment of a Cationic Water-soluble Polymer and Cellulosic Nanofibril

将聚酰胺多胺环氧氯丙烷树脂(PAE)、阳离子淀粉(CS)分别与纤维素纳米纤丝(CNF)组成二元增强体系,考察其对一种以针/阔叶木混合浆(配比为30/70)为原料抄造的低定量(30 g/m2)纸页的增强效果。结果表明:PAE/CNF二元体系对纸张的增湿强效果明显,PAE用量为0. 5%(助剂绝干量对纸浆绝干量的质量百分数)、CNF用量为0. 3%时,纸张湿抗张强度是未处理空白纸样的6. 2倍,是PAE单独处理纸样(PAE用量0. 5%)的1. 76倍;CS/CNF二元体系则对纸张的增干强效果较为明显,CS用量为2. 0%、CNF用量为0. 3%时,纸张干抗张强度是未处理的空白纸样的1. 65倍,是CS单独处理纸样(CS用量2. 0%)的1. 26倍。

Cellulosic nanofibril （CNF） was attempted as the anionic component of two dual strengthening systems where PAE or CS was used as the cationic component respectively. Their strengthening effects were especially investigated for a low basis weight （ 30 g/m^2 ） paper made from a mixture of fully bleached softwood and hardwood pulp in 3：7 ratio. The results showed that for the PAE （0. 5% ）/CNF （0.3%） dual system where the dry-to-dry based dosage of PAE and CNF was 0.5% and 0.3% to the pulp, it incurred 1.76 times higher wet tensile strength than the single PAE （0. 5% ） system and 6. 2 times higher than the blank sample without any treatment. For the CS （2. 0% ）/CNF （0. 3% ） dual treatment, while it had no significant improvement on wet strength of paper, its improvement on dry strength was 1.26 times higher than that of CS （2. 0% ） single treatment and 1.65 times higher than the blank sample.