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通过联合Zeta电位、吸光度和数码图像分析,考察了碱性预处理和不同试剂表面处理对碳纤维分散性的影响,并以碳纤维配加纸浆制取纸样,检测纸张的物理强度和体积电阻率。实验结果表明:碱性预处理可改善碳纤维分散性,吐温-80和CPAM试剂都可显著提高碳纤维分散性及成纸抗张指数和电导率,但作用机理截然不同。吐温-80通过降低固液表面张力,提高水对纤维的润湿能力,改善碳纤维分散性;CPAM则是通过形成三维空间大网络絮体,阻止碳纤维的运动聚集,来改善其在纸浆中的分散。
Through the combination of Zeta potential, absorbance and digital image analysis, the effects of alkaline pretreatment and different reagent surface treatments on the dispersity of carbon fiber were investigated. The paper was made by adding carbon fiber and pulp, and the physical strength and volume resistivity of the paper were measured. The experimental results show that alkali pretreatment can improve the dispersibility of carbon fiber. Twain -80 and CPAM can significantly improve the dispersibility of carbon fiber and the tensile index and conductivity of the paper, but the mechanism of action is quite different. Twain -80 can improve the wettability of water and improve the dispersibility of carbon fiber by reducing the surface tension of solid-liquid, CPAM can improve the dispersibility of carbon fiber by forming three-dimensional large-scale network flocs to prevent the carbon fiber from moving and aggregating dispersion.