麦草浆中木素含量对其MFC增强性能的影响

Effect of Wheat Straw Pulp Lignin Content on Enhancement Performance of Its MFC Product

中文关键词:  微纤化纤维素（MFC）  木素  BCTMP  增强剂

Key Words:microfibrillated cellulose (MFC)  lignin  BCTMP  strengthening agent

中文摘要:

      实验自制3种不同木素含量的麦草浆及相应的微纤化纤维素（MFC）产品，并以MFC为增强剂用于漂白化学热磨机械浆（BCTMP）抄片，探究其对BCTMP浆张强度性能的影响。结果表明，麦草浆中木素含量对用其制备的MFC产品增强性能具有显著影响，将木素含量分别为24.04%、11.82%和3.84%的麦草浆制得的MFC按用量5%添加到BCTMP中，手抄片裂断长分别为1.96、2.56和2.53 km，当MFC用量增至20%时，手抄片裂断长分别增加到2.48、4.17和4.61 km，低木素含量麦草浆制备的MFC增强性能更显著；扫描电子显微镜（SEM）、X射线光电子能谱仪（XPS）、扫描电子显微镜-能谱仪（SEM-EDS）等定量分析结果进一步证明，麦草浆中的木素是通过抑制MFC制备过程中微纤丝的形成以及影响MFC表面活性羟基相对含量2方面作用共同影响MFC的增强性能。

Abstract:

      The wheat straw microfibrillated celluloses (MFCs) with different lignin contents were used as strengthening agents in BCTMP handsheets. The objective of this study was to investigate the impact of wheat straw pulp lignin content on its MFC enhancement of paper strength. The results showed that the lignin content of wheat straw pulp had a significant effect on its MFC enhancing performance. As the dosages of MFCs with lignin contents of 24.04%, 11.82% and 3.84% increased from 5% to 20%, the breaking length of the BCTMP handsheets were increased from 1.96, 2.56 and 2.53 km to 2.48, 4.17 and 4.61 km, respectively, indicating that the MFC prepared with low lignin content pulp could increase the paper strength prominently. The relationship between lignin content of wheat straw MFC and MFC properties was quantitatively analyzed by SEM, XPS and EDS technologies. The lignin of wheat straw pulp could inhibit the fibrillation of the pulp during MFC preparation and reduce the surface active hydroxyl group of MFC．