聚氨酯改性环氧树脂抗水损害研究
Water Resistance of Polyurethane Modified Epoxy Resin
刘伟 1梅佳鸿 1单景松 2王翔 1宋成法2
作者信息
- 1. 山东高速路桥集团股份有限公司,济南 250014
- 2. 山东科技大学 土木工程与建筑学院,山东 青岛 266590
- 折叠
摘要
聚氨酯改性环氧树脂具有良好的黏结性能及抗变形性能,已成为钢桥面铺装黏结层材料的选择之一.依托山东某沿海地区钢桥面实体工程,研究聚氨酯改性环氧树脂作为钢桥面黏结层的抗水损害性能,设计了水侵蚀作用的干湿循坏和冻融循环试验,采用宏观和微观相结合的试验方法研究其水作用后力学性能变化及微观损伤机理.结果表明:干湿/冻融循环过程中,聚氨酯改性环氧树脂外观颜色变黄,内部产生缺陷,引发应力集中,导致拉伸强度及断裂伸长率有所降低;随着干湿/冻融循环次数增加,树脂-钢板间剪切强度前期呈降低趋势,后期有小幅度升高,整体变化幅度不大;水作用下酯基产生一定水解作用,水接触角降低,亲水性增强,拉伸断裂面微观下可发现银纹或裂缝扩展破坏.
Abstract
Polyurethane modified epoxy resin has good bonding performance and deformation resistance,and has become one of the choices of bonding layer materials for steel bridge deck pavement.Based on the solid project of steel bridge deck in a coastal area of Shandong Province,the water damage resistance of polyurethane modified epoxy resin as the bonding layer of steel bridge deck was studied.The dry-wet cycle and freeze-thaw cycle tests of water erosion were designed.The mechanical properties and microscopic damage mechanism after water action were studied by combining macro and micro test methods.The results are as follows.During the dry-wet/freeze-thaw cycles,the appearance color of the polyurethane modified epoxy resin becomes yellow,and the internal defects cause stress concentration,resulting in a decrease in tensile strength and elongation at break.With the increase of the number of dry-wet/freeze-thaw cycles,the shear strength between the resin and the steel plate decreased in the early stage,and increased slightly in the later stage,and the overall change was not significant.Under the action of water,the ester group has a certain hydrolysis,the water contact angle is re-duced,the hydrophilicity is enhanced,and the crazing or crack propagation damage can be found under the mi-croscopic tensile fracture surface.
关键词
聚氨酯/环氧树脂/改性/抗水损害Key words
polyurethane/epoxy resin/modification/water damage resistance引用本文复制引用
基金项目
山东省自然科学基金(ZR2021ME04)
山东省企业技术创新项目(202350101571)
出版年
2024
NETL
NSTL
万方数据