纳米SiO2的分散及添加对芳纶纸性能的影响

通过正交实验探讨了分散浓度、超声时间、超声功率及分散剂用量对纳米SiO2分散性能的影响,并将纳米SiO2加入到芳纶纸中,研究了纳米SiO2的添加对纸张强度性能、紧度、介电性能及结晶性能的影响。结果表明,当纳米SiO2的分散浓度为0.1%,超声时间为30 min,超声功率为400 W,分散剂用量为2%时,分散性最好。当纳米SiO2的用量为15%时,芳纶纸具有最大的的抗张指数,为33.51 N·m/g,撕裂指数则在用量为10%时最大,为38.84 mN·m2/g。纳米SiO2的用量为15%时,纸张的耐压强度最大,为13.20 kV/mm,在实验中纳米SiO2的用量范围内,纸张的紧度基本不变。另外,相比未添加纳米SiO2的芳纶纸,加入纳米SiO2后纸张的结晶度有所降低。

Dispersion of Nano-SiO2 and the Effect of its Addition on the Performance of Aramid Paper

The influence of dispersion concentration, ultrasonic time, ultrasonic power and the amount of dispersant on dispersion properties of nano-SiO2 was explored by orthogonal experiments. Then nano-SiO2 was added into aramid paper, the influences of addition amount of the nano-SiO2 on the mechanical properties, density, dielectric properties and crystalline properties of the aramid paper were studied. The results showed that: when the dispersing concentration of nano-SiO2 was 0.1%, ultrasonic time was 30min, ultrasonic power was 400W and the amount of dispersant was 2%, dispersing effect was the best. When the addition amount of nano-SiO2 was 15%, the aramid paper had a maximum tensile index of for 33.51 N·m/g.while the addition amount of nano-SiO2 was 10%, the tear index of aramid paper was maximum, as 38.84 mN·m2/g. When the addition amount of nano-SiO2 was 15%, the aramid paper had a maximum votage resistance strength of 13.20 kV/mm. In the range of addition amount in the experiment, the density of the paper basically unchanged. In addition, the crystallinity of aramid paper adding nano-SiO2 decreased compared to the aramid paper without nano-SiO2.