喷涂阳离子化MFC对柴油滤纸孔隙结构的影响研究

Effect of Spraying Cationic Microfibrillated Cellulose on the Pore Structure of Diesel Filter Paper

关键词:  阳离子化微纤化纤维素  复合柴油滤纸  孔隙结构  透气度

Key Words:Cationized Microfibrillated Cellulose  Composite Filter Paper  Pore Structure  Air Permeability

摘要:以漂白硫酸盐针叶木浆为原料制备不同直径的阳离子化微纤化纤维素（C-MFC），并喷涂在单层柴油滤纸原纸表面制备复合柴油滤纸，通过扫描电子显微镜（SEM）分析其表面形貌，实验分析不同直径C-MFC对复合柴油滤纸孔隙结构、强度、透气度及紧度等性能影响。结果表明，随着均质压力的增加，C-MFC的平均直径从154.52 nm降至68.26 nm，复合滤纸的平均孔径由空白样的21.27 μm逐渐降低至14.1 μm，最大孔径由64.2 μm逐渐降低至38 μm，且孔径分布更加均一；喷涂C-MFC显著改善柴油滤纸原纸的强度性能，在均质压力70 MPa条件下获得的阳离子化MFC产品用于复合滤纸制备，其抗张指数和耐破指数相比于空白样分别增加了61.16%和124.6%。

Abstract:A cationized microfibrillated cellulose (C-MFC) with different diameters was prepared from softwood bleached kraft (SWBK), and sprayed on the surface of a single-layer diesel filter paper base paper to prepare a composite diesel filter paper. The surface morphology of filter papers was analyzed by scanning electron microscope (SEM). The effects of C-MFC with different diameters on the pore structure, strength, air permeability and tightness of the composite diesel filter paper were experimentally analyzed. The results showed that the average diameter of C-MFC decreased from 154.52 nm to 68.26 nm with increasing homogenization pressure. Compared with the blank sample, the average pore diameter of composite filter papers was reduced from 21.27 μm to 14.1 μm, and the maximum pore diameter was reduced from 64.2 μm to 38 μm. And the pore size distribution of filter papers was more uniform. The spraying of C-MFC can significantly improve the strength properties of diesel filter paper base paper. The C-MFC product obtained at a homogenization pressure of 70 MPa was used for the preparation of composite filter paper. Its tensile index and burst index were increased compared to the blank sample 61.16% and 124.6%.