基于高得率浆的纤维素微纤丝的制备及其在浆张增强中的应用

Preparation of Lignin Contained Cellulose Microfibril Based on High Yield Pulps and Its Application in Enhancing Handsheets’ Physical Properties

关键词:  高得率浆  P-RC APMP  含木素的纤维素微纤丝  物理强度

Key Words:high yield pulps  P-RC APMP  lignin contained cellulose microfibril (L-CMF)  physical properties

摘要:本研究采用化学和机械相结合的方法处理杨木P-RC APMP（木素含量22.73%），制备了一种含木素的纤维素微纤丝（Lignin contained cellulose microfibril，L-CMF），对其进行了分析和表征；并将L-CMF应用于浆张抄造，研究了L-CMF对浆张物理性能的影响。结果表明，采用TEMPO氧化法与高压均质相结合所制备的L-CMF直径约为200～400 nm，羧基含量为1165.29 mmol/kg；L-CMF能有效提高漂白硫酸盐针叶木浆（BSKP）、杨木P-RC APMP以及两者配抄后浆张的物理强度。当L-CMF添加量为7%，杨木P-RC APMP配比为30%时，L-CMF对浆张的增强效果尤为明显，浆张的抗张指数和耐破指数分别比空白样提高30.2%和50.4%；但L-CMF的加入会使浆张的松厚度、白度和不透明度略有降低。

Abstract:To extend the application of high yield pulps, the lignin contained cellulose microfibril (L-CMF) was prepared by treating poplar P-RC APMP (lignin content of 22.73%) with chemical and mechanical methods. The resultant L-CMF was obtained by TEMPO-mediated oxidation and homogenization treatment. The L-CMF’ main characteristics were analyzed, and their application in enhancing handsheets’ physical properties was also investigated. The results showed that the diameter of the L-CMF was 200~400 nm, and carboxyl content was 1165.29 mmol/kg; the L-CMF could effectively improve the physical strength of all handsheets prepared by BSKP, poplar P-RC APMP, and the mixture of these two kind of pulps with different ratios. When the proportion of P-RC APMP in the mixtures was 30% and the dosage of L-CMF was 7.0%, the physical strength of the handsheet was improved significantly, the tensile index and burst index were increased by 30.2% and 50.4%, respectively. However, the bulk, brightness, and opacity were slightly reduced.