纳米CaCO3粒子对不饱和聚酯树脂性能影响研究

本文使用纳米CaCO3粒子对196#不饱和聚酯树脂(UP)进行改性,考察不同质量分数的纳米CaCO3粒子对196#UP性能的影响。实验结果表明,树脂的凝胶时间、粘度随纳米CaCO3粒子用量的增加而增大。用量为1.0%时树脂有脆韧转变现象;用量为4%时拉伸强度和断裂延伸率分别提高约45%和67%,玻璃化温度Tg提高约30%,巴氏硬度提高34%。用KH-570偶联剂进行表面处理有利于纳米CaCO3粒子在UP中的分散。用扫描电子显微镜观测纳米CaCO3/UP拉伸断口形貌时发现,其微观形态在脆韧转变点附近有脆性断裂转为韧性断裂的形貌特征。

PROPERTY STUDY OF UNSATURATED PLOYESTER RESIN MODIFIED WITH NANO-CaCO3 PARTICLES

The 196# type UP resin is modifide by using nanometer CaCO3 particles.The effect of nano-CaCO3 content on 196# UP properties is investigated.The results shows that the gel time and viscosity of 196#UP increases greatly with the increase of nanometer CaCO3 particle content.An brittle to tough transformation is observed at the critical content of 1% nanometer CaCO3 particles.When the content of nanometer CaCO3 is 4%,the tensile strength and elongation at break of 196#UP increase by 45% and 67%,glass transition temperature Tg and Bacol hardness of 196#UP increase by 30% and 34% respectively.Nano-CaCO3 particle surface treatment with KH-570 coupling agent can improve the disperson of nano-CaCO3 in 196#UP.The micro-appearance observation of the tensile fracture show that the fracture pattern of nano-CaCO3/UP changes from typical brittle to tough fracture near the critical point.