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采用超声分散与机械搅拌混合方法制备了埃洛石纳米管(HNTs)/水性环氧树脂复合材料。通过TEM、SEM对HNTs及复合材料进行了表征,并分析了HNTs含量对水性环氧树脂乳液的流变行为、乳胶膜的热稳定性及涂膜性能的影响。结果表明:HNTs可在水性环氧树脂体系中均匀分散,使复合材料由脆性断裂转变为韧性断裂;但当w(HNTs)>5%时,复合材料出现明显团聚,最佳添加量为w(HNTs)=2%,此时复合体系的热稳定性增强,热分解温度由358℃提高到365℃,剪切速率为10 s-1时,黏度由0.73 Pa·s增加到0.85 Pa·s;HNTs起到类交联点的作用;储能模量提高了8.1倍,内耗降低,复合体系呈现假塑性和明显的触变性,稳定性增强,水性环氧树脂乳胶膜的耐水性得到改善,与未添加HNTs的环氧树脂相比,当w(HNTs)=5%时,吸水率由27.8%降低到15.9%,涂膜的硬度由3H提高到4H,柔韧性由1 mm提高到0.5 mm。但当w(HNTs)>5%时,体系结构与稳定性会被破坏,导致涂膜综合性能下降。
Hero-dendritic nanotubes (HNTs) / waterborne epoxy resin composites were prepared by ultrasonic dispersion and mechanical stirring. The HNTs and composite materials were characterized by TEM and SEM, and the rheological behavior of HNTs, the thermal stability of the latex film and the coating film properties were analyzed. The results show that HNTs can be dispersed uniformly in water-based epoxy resin system, which makes the composites transform from brittle fracture to ductile fracture. However, when the content of HNTs> 5%, the composite agglomerates obviously, and the optimum addition amount is w HNTs = 2%, the thermal stability of the composite system is enhanced, the thermal decomposition temperature is increased from 358 ℃ to 365 ℃, and the viscosity increases from 0.73 Pa · s to 0.85 Pa · s when the shear rate is 10 s-1. HNTs play the role of cross-linking point; the storage modulus increases by 8.1 times, the internal friction decreases, the pseudoplasticity and thixotropy of the composite system appear, the stability is enhanced, the water resistance of the waterborne epoxy resin latex film is improved, and The water absorbency decreased from 27.8% to 15.9% at w (HNTs) = 5%, the hardness of the coating increased from 3H to 4H, and the flexibility increased from 1 mm to 0.5 mm compared with epoxy resin without HNTs. However, when H (HNTs)> 5%, the structure and stability will be destroyed, resulting in a decline in the overall performance of the coating.