【摘要】 采用单螺杆挤出机混炼和手糊成型工艺分别制备了粘弹体胶带和可水下固化的聚氨酯玻璃钢材料。利用紫外光老化和湿热加速老化试验,通过拉伸强度保留率、断裂伸长率保留率和SEM谱图测试等手段,研究了粘弹体胶带和聚氨酯玻璃钢材料的耐紫外光老化和耐海水腐蚀性能;并采用质量变化率试验和Fick第二扩散定律建立了海水对粘弹体胶带/聚氨酯玻璃钢材料复合包覆层的渗透模型,对粘弹体胶带和聚氨酯玻璃钢材料的耐海水渗透寿命进行了预测。结果表明,聚氨酯玻璃钢材料的拉伸强度为124 MPa,粘弹体胶带的断裂伸长率为125.0%、对钢剥离强度为5 N/cm;紫外光老化3 000 h后,聚氨酯玻璃钢材料的拉伸强度保留率为67.7%,粘弹体胶带的断裂伸长率保留率为73.6%;湿热加速老化720 h后,聚氨酯玻璃钢材料的拉伸强度保留率为54.0%,粘弹体胶带的断裂伸长率保留率为88.0%;粘弹体胶带/聚氨酯玻璃钢材料复合包覆层的抗海水渗透寿命约为35.9 a,其使用寿命大大高于普通防腐涂层。更多还原

【Abstract】 The viscoelastic tape and the polyurethane FRP material which could be solidified underwater were prepared by single screw extruder mixing and hand lay up, respectively. The UV aging and seawater corrosion resistance of viscoelastic tape and polyurethane FRP were studied by means of UV aging and hygrothermal accelerated aging tests, tensile strength retention rate, elongation at break retention rate and SEM spectrum test. The permeability model of the composite coating of viscoelastic tape/polyurethane FRP was established by using the mass change rate test and Fick’s second diffusion law, and the resistance life of viscoelastic tape and polyurethane FRP was predicted. The results showed that the tensile strength of the material was 124 MPa, the elongation at break of the viscoelastic tape was 125.0%, and the peel strength to steel was 5 N/cm. After UV aging for 3000 h, the retention rate of tensile strength and elongation at break of polyurethane FRP and viscoelastic tape were 67.7% and 73.6%, respectively. After 720 h of accelerated aging, the retention rate of tensile strength and elongation at break of polyurethane FRP and viscoelastic tape were 54.0% and 88.0%, respectively. The service life of viscoelastic tape/polyurethane FRP composite coating was about 35.9 a, which was much longer than that of common anticorrosive coating.更多还原