纤维素纳米纤丝(CNF)对电解电容器纸性能的影响

Effect of Cellulose Nanofibrils (CNF) on the Performance of Electrolytic Capacitor Paper

关键词:  电解电容器纸  纤维素纳米纤丝  相对结合面积  强度性能  电气性能

Key Words:electrolytic capacitor paper  cellulose nano-fibril  relative bonding area  strength properties  electrical properties

摘要:摘 要：以未漂硫酸盐针叶木浆为电解电容器纸原料，研究了添加纤维素纳米纤丝(CNF)对电解电容器纸强度等性能的影响，并在PAGE方程的基础上进一步研究了添加CNF和提高打浆度对相对结合面积（RBA）的影响，最后研究了CNF对电解电容器纸电气性能的影响。结果表明，CNF对电解电容器纸的紧度、透气度、抗张指数均有明显影响，但随着打浆度提高，CNF对紧度的提高、透气度的降低、抗张指数增大的贡献逐渐减小；在PAGE方程的基础上研究得出，提高打浆度和添加少量CNF可以增大纸页的RBA。综合考虑电解电容器纸高紧度、低透气度的要求，以及打浆节能和CNF成本因素，选择适宜的打浆度为80°SR，CNF的添加量为2%(相对于绝干浆质量)，在此条件下纸页抗张指数达到76.00 N·m·g-1，紧度为0.80 g·cm-3，透气度为0.233 μm·Pa·s-1；工频下电解电容器纸的介电常数为1.21，介质损耗为0.037，击穿场强为15.13 kV·mm-1。

Abstract:Abstract: The effect of cellulose nano-fibrils (CNF) on the properties of electrolytic capacitor paper was studied by using unbleached sulphate softwood pulp as raw material. Based on the PAGE equation, the effect of adding CNF and increasing beating degree on the relative bonding area (RBA) was further investigated. Finally, the influence of CNF on the electrical properties of electrolytic capacitor paper was researched in details. The results indicated that the addition of CNF has obvious influence on the tightness, air permeability and tensile index of electrolytic capacitor paper. CNF can increase the tightness and tensile strenght, and decrease the air permeability, but the effect of CNF decreased with increasing the beating degree. Based on the PAGE equation, the increase of the beating degree and the addition of a small amount of CNF can increase the RBA of the paper. Considering the high tightness and low air permeability requirements of electrolytic capacitor paper, as well as the energy saving of beating and CNF cost, the optimal condition was decided as follows: the beating degree is 80°SR, and the CNF dosage is 2%. Under this condition, the tensile index reaches to 76.00 N·m·g-1, the tightness is 0.80 g·cm-3, and the air permeability is 0.233 μm·Pa·s-1; the dielectric constant is 1.21, the dielectric loss is 0.037, and the field penetration is 15.13 kV·mm-1 under the power frequency.