环氧树脂及其复合材料高温高压矿化水条件下的老化机理及性能  

Aging Mechanism and Properties of Epoxy Resin and Its Composites under High-Temperature and High-Pressure Mineralized Water Conditions

作　　者：杨成瑞 王豪[1] 李鹏[1] 王芫芫 李风 张瑾[2,3] Yang Chengrui;Wang Hao;Li Peng;Wang Yuanyuan;Li Feng;Zhang Jin(Beijing University of Chemical Technology,Beijing 100029,China;Technical Testing Center of Sinopec Shengli Oilfield Branch,Dongying 257000,China;Test Assessment and Research Co.,Ltd.of Sinopec Shengli Oilfield,Dongying 257000,China)

机构地区：[1]北京化工大学,北京100029 [2]中国石油化工股份有限公司胜利油田分公司技术检测中心,山东东营257000 [3]中国石油化工股份有限公司胜利油田检测评价研究有限公司,山东东营257000

出　　处：《工程塑料应用》2022年第4期97-105,共9页Engineering Plastics Application

基　　金：中石化胜利油田重点实验室项目(KL20043)。

摘　　要：采用物理机械混合的方式将硅烷偶联剂或碳纳米管分别加入环氧树脂(EP)中,经缠绕成型制备玻璃纤维(GF)增强EP复合材料NOL环,并通过静态力学性能、动态力学性能、扫描电子显微镜、傅里叶变换红外光谱及能谱分析等对复合材料老化前后的性能进行表征。研究发现,当添加硅烷偶联剂质量分数为1.5%或碳纳米管质量分数为0.2%时,复合材料的力学性能最为优异。高温高压矿化水老化后,复合材料的力学性能下降,玻璃化转变温度下降9℃;溶液中的金属离子由于体积限制难以进入复合材料内部,复合材料性能的劣化主要是温度、水分对于EP基体、EP基体与GF界面产生的破坏造成的。水分子进入后可以与EP中的极性官能团结合生成氢键并且导致酯基的水解,靠近外部溶液的部位受损伤更严重;EP基体中添加硅烷偶联剂或碳纳米管后,水分子在复合材料内部的扩散能力减弱,老化后复合材料的拉伸、层间剪切强度保留率提高,耐老化性能提升。A glass fiber(GF)reinforced epoxy resin(EP)composite NOL ring was prepared through filament winding after adding a silane coupling agent or carbon nanotube into EP using physical and mechanical mixing methods.The properties of the composites were characterized before and after aging through static and dynamic mechanical properties,as well as scanning electron microscope,fourier transform infrared spectroscopy and energy spectrum analysis.The results show that the best mechanical properties of the the as-prepared composite were ascer-tained for the silane coupling agent and carbon nanotubes at 1.5wt%and 0.2wt%,respectively.The mechanical properties of the composite decreases after being subjected to high-temperature and high-pressure mineralized water aging,and the glass transition temperature drops by 9℃.The metal ions in the solution are difficult to enter the interior of the composite due to the volume limitation.The deterioration of the composite properties is mainly caused by the temperature and moisture damage to the EP matrix and the interface between the EP matrix and GF.Water molecules couple with polar functional groups in the EP resin to form hydrogen bonds and produce hydrolysis of the ester group.The parts near the external solution suffer severer damage.The diffusion ability of water molecules in the composite is weakened after the silane coupling agent or carbon nanotubes are added into the EP matrix.At the same time,the composite’s aging resistance and post-aging strength retention rate are improved.

关 键 词：复合材料 老化 力学强度 微观形貌 

分 类 号：TB332[一般工业技术—材料科学与工程]