添加改性纳米SiO2对芳纶纸性能的影响

Effects of Modified Nano-SiO2 Fillers on Mechanical Properties of Aramid Paper

关键词:  芳纶纸  硅烷偶联剂  纳米SiO₂  性能

Key Words:aramid paper  silane coupling agent  nano- SiO₂  performance

摘要:采用4种不同用量的硅烷偶联剂KH-550对纳米SiO₂表面进行改性,并检测改性后纳米SiO₂粒径的大小；研究了改性后纳米SiO₂的添加量对芳纶纸性能的影响；通过扫描电镜(SEM)观察添加改性纳米SiO₂后芳纶纸的表观形貌,并将纳米SiO₂添加前后纸张抗张强度和介电强度进行了对比。结果表明,随着硅烷偶联剂用量的增加,改性纳米SiO₂的粒径有所减小；当纳米SiO₂与硅烷偶联剂KH-550配比为5 g∶20 mL、改性纳米SiO₂添加量为5%时,芳纶纸的抗张强度提高了66.2%,硅烷偶联剂用量的增加对纸张伸长率有一定影响,其紧度变化不明显；SEM图显示改性纳米SiO₂粒子填充在纸张空隙处利于纸张性能的增强；添加改性纳米SiO₂较未添加纳米SiO₂和添加未改性纳米SiO₂芳纶纸的抗张强度和介电强度均有所提高。

Abstract:Nano-SiO₂ particles were modified with silane coupling agent KH-550 in four different amount and the modified nano- SiO₂ particle size was determined. At the same time, the effects of addition of modified nano- SiO₂ on mechanical properties of aramid paper were studied, and the apparent morphology of aramid paper adding modified nano- SiO₂ was observed by scanning electron microscopy (SEM). The tensile and dielectric strength of the aramid papers with and without adding nano- SiO₂ were compared. The results showed that the modified nano- SiO₂ particle size was decreasing with the coupling agent amount increasing. When the ratio of nano- SiO₂ and silane coupling agent KH-550 was 5 g∶20 mL, the adding dosage of modified nano-SiO2 was 5%, the tensile strength of the paper was increased by 66.2%. Modified nano- SiO₂ particles filled the gap in the paper was favorable for enhancing the performance of paper. Increasing the amount of the silane coupling agent had a certain influence on the elongation of the paper, but not changed significantly tightness. The tensile and dielectric strength of aramid paper adding modified nano- SiO₂ were improved compared to the aramid paper without SiO₂ and adding unmodified nano- SiO₂.