CPAM-膨润土双元体系在新型硅酸钙加填纸上的应用

Application of CPAM-bentonite Micro-particle System in Papermaking with Using Fly Ash Based Calcium Silicate as Filler

关键词:  FACS  CPAM-膨润土微粒体系  留着和滤水性能  成纸性能

Key Words:FACS  CPAM-bentonite micro-particle system  retention and drainage properties  paper properties

摘要:比较分析了CPAM-膨润土双元微粒助留体系对新型硅酸钙（FACS）和研磨碳酸钙(GCC)加填浆料的留着、滤水及纸张性能的影响。实验结果表明，CPAM-膨润土双元体系应用于FACS加填纸中时,CPAM需求量高于GCC加填的；膨润土用量为0.1%时,CPAM用量的增加,能改善FACS加填纸料的留着性能,但对其滤水性能却有不利影响；CPAM用量为0.08%时,随着膨润土用量的增加,FACS加填纸料Zeta电位的下降比GCC加填的更快；膨润土的用量低于0.2%时,膨润土用量的增加对纸料的首程留着率和滤水性能都有利。CPAM用量为0.08%、膨润土用量为0.1%时,FACS加填纸白度与GCC加填纸张相当,但是不透明度比GCC加填纸高；FACS加填纸的抗张指数比GCC加填纸低11.2%,撕裂指数比GCC加填纸低21.0%；FACS加填纸张的松厚度比GCC加填纸高41.7%。加填纸张的扫描电镜对比发现,FACS能够较好地填充在纤维之间的缝隙中,可以看到纤维与填料之间有较好的交织。

Abstract:A fly ash based calcium silicate(FACS), with a highly porous surface structure, high specific surface area (121 m²/g), and low bulk density (0.31 g/cm³) was used as filler in papermaking. In this paper, the application of CPAM-bentonite micro-particle retention and drainage system along with FACS was studied and its effect on drainage, retention and paper properties was investigated. The results from dynamic retention and drainage tests showed that, the pulp containing FACS as filler consumed more CPAM than using GCC as filler. When bentonite dosage was 0.1%, with increasing of the amount of CPAM, FACS-filled pulp had better retention and worse drainage. When CPAM dosage was 0.08%, with increasing of bentonite less than 0.2%, drainage and retention behavior of FACS-filled pulp was obviously improved. The filled paper properties indicated that FACS filled paper had similar brightness, higher opacity, 11.2% lower tensile index, 21.0% lower tear index, 41.7% higher bulk than those loaded with GCC. SEM observation of the paper sheets loaded with FACS figured that the fibers were well intertwined with FACS.