增强剂对碳纤维纸性能影响的研究

研究了三聚氰胺甲醛树脂(MF)、聚酰胺环氧氯丙烷(PAE)、聚乙烯醇(PVA)和阳离子聚丙烯酰胺(CPAM)4种增强剂以浆内添加和表面涂覆两种方式对碳纤维纸强度、透气度和导电性能的影响,同时分析了压榨对碳纤维纸性能的影响。结果表明,增强剂在提高碳纤维纸物理指数的同时降低了其导电性和透气性。浆内添加MF对碳纤维纸抗张指数的提升最为明显,但电阻和透气度的降低幅度也最大;表面涂覆CPAM,对碳纤维纸抗张指数影响显著,最大值较其他增强剂增大了近2倍,表明CPAM的表面涂覆可以进一步增加碳纤维纸强度;压榨可以明显提高碳纤维纸的抗张指数,在增强剂用量较低的时,抗张指数的提升幅度被强化,可使抗张指数提前达到最高值;减弱了增强剂对碳纤维纸电阻的影响。

Study on the Effect of Strength Additives on the Performance of Carbon Paper

The effect of application of four typical strength additives melamine formaldehyde resin (MF), polyamide epichlorohydrin (PAE), polyvinyl alcohol (PVA) and cationic polyacrylamide (CPAM) in carbon paper with two ways of internal sizing and surface sizing on the properties of carbon paper including physical strength, air permeability and the conductivity was investigated. Meanwhile the effect of pressing on the performance of the handsheet was compared. The results showed that the strength additives could increase the physical strength of carbon paper while resulting in the reduction of conductivity and permeability. The the promotion of tensile index was most obvious, but the reductions of air permeability and the conductivity were also biggest when MF was used internally. Surface sizing of CPAM had the most significant effect on tensile index of carbon paper, its maximum was almost double of that by using other additives, suggesting that the effective retention of CPAM could further increase the strength of carbon paper. Pressing could increase the carbon paper tensile index obviously, the increase of tensile index was amplified under the low dosage of strength additive, and the maximum of tensile index was reached in advanced. The influence of strength additive on carbon paper resistance was weakened.