钢桥面耐久型含氟丙烯酸酯-环氧树脂防水粘结层的制备与性能  

Preparation and properties of durable fluorinated acrylate-epoxy waterproof adhesive layer for steel bridge deck

作　　者：夏慧芸[1] 卢昌杰 杨浩田 张佃康 宋莉芳[1] 牛艳辉 XIA Huiyun;LU Changjie;YANG Haotian;ZHANG Diankang;SONG Lifang;NIU Yanhui(School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China)

机构地区：[1]长安大学材料科学与工程学院,西安710064

出　　处：《复合材料学报》2023年第9期5057-5069,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52278427);长安大学中央高校基本科研业务费专项(300102310301,300102311404)。

摘　　要：钢桥面铺装层由于防水粘结层失效导致其使用寿命远远低于桥梁结构的使用年限。为了延长钢桥面铺装层的使用寿命,改善层间粘结状况,制备了一种耐久型聚合物防水粘结层。利用自由基溶液聚合法合成了一系列含氟量不同的聚丙烯酸丁酯-甲基丙烯酸十二氟庚酯-甲基丙烯酸甲酯-苯乙烯嵌段共聚物,将上述共聚物与双酚A型环氧树脂E-51物理共混得到5种自分层防水涂料,再将其涂覆于钢桥面板表面静置干燥即可得到防水粘结层。通过傅里叶变换红外光谱、静态接触角测试、扫描电子显微镜研究了涂料在固化阶段的自分层行为,利用表面能理论对自分层行为进行了理论验证。最后研究了不同含氟量粘结层的高低温性能、力学性能、不透水性能、粘结强度及紫外老化耐久性。结果表明:当含氟量为20wt%时,其拉伸强度与断裂伸长率达到最大值,分别可达到7.04 MPa,128.9%;同时表现出最佳的粘结强度与紫外老化耐久性,综合性能达到最优。The service life of steel deck pavement is far shorter than that of bridge structure due to the failure of waterproof adhesive layer.In order to prolong the service life of steel bridge deck pavement and improve the bonding condition between layers,a durable polymer waterproof bonding layer was prepared.A series of poly(butyl acrylate)-dodecafluoroheptyl methacrylate-methyl methacrylate-styrene block copolymers with different fluorine contents were synthesized by free radical solution polymerization.Five kinds of self-stratified waterproof coatings were obtained by physical blending of the above copolymers with bisphenol A epoxy resin E-51,and then they were coated on the surface of steel bridge deck to get a waterproof bonding layer after standing and drying.The self-stratification behavior of coatings in curing stage was studied by Fourier transform infrared spectroscopy,static contact angle test and scanning electron microscope.The self-stratification behavior was theoretically verified by surface energy theory.Finally,the high and low temperature properties,mechanical properties,impermeability,bonding strength and ultraviolet aging durability of the bonding layers with different fluorine contents were studied.The results show that when the fluorine content is 20wt%,the tensile strength and elongation at break reach the maximum,reaching 7.04 MPa and 128.9%respectively.At the same time,it shows the best bonding strength and ultravi-olet aging durability,and the comprehensive performance reaches the best.

关 键 词：钢桥面铺装 防水粘结层 含氟丙烯酸树脂 自分层 环氧树脂 

分 类 号：U444[建筑科学—桥梁与隧道工程] TQ630.7[交通运输工程—道路与铁道工程] TB332[化学工程—精细化工]