表面技术2017，Vol.46Issue(10)：9-14,6.DOI:10.16490/j.cnki.issn.1001-3660.2017.10.002
硬段含量对TDI-BDO-PPG水性聚氨酯涂层穴蚀性能的影响
Effects of Hard-segment Content on Cavitation Property of TDI-BDO-PPG
Waterborne Polyurethane Coating
冯建东 1齐育红 1杨帆 1张占平 1奚江涛1
作者信息
摘要
Abstract
The work aims to study effects of hard-segment content on cavitation performance of TDI-BDO-PPG waterborne polyurethane (waterborne polyurethane series mainly with TDI as hard segment, BDO as chain extender, PPG as soft segment) in seawater. TDI-BDO-PPG waterborne polyurethane with different hard-segment content was prepared, and cavitation simula-tion test was performed to it by using ultrasonic cavitation tester. Structural characteristic peak of the polyurethane, tensile prop-erties of the specimens, 100% fixed elongation permanent deformation rate as well as morphology of the specimens before and after cavitation were studied by using fourier infrared spectrometer, tensile testing machine, laser confocal microscope, etc. Or-dinary carbon steel coated with TDI-BDO-PPG waterborne polyurethane exhibited better cavitation resistance than itself. As the hard-segment content increased from 27% to 50% gradually, vibration peak associated with hydrogen bond obviously increased, elongation of the specimens decreased, tensile strength increased, 100% fixed elongation permanent deformation rate increased and cavitation-resistant time gradually shortened. There was no linear relationship between cavitation resistance time and hard-segment content, but better cavitation resistance was exhibited when the hard-segment content was about 30%. After the cavitation, a wide range of fine uniform cracks appeared on the coating containing 50% hard segment. The hard-segment content has a significant effect on cavitation resistance of TDI-BDO-PPG waterborne polyurethane in seawater. TDI-BDO-PPG water-borne polyurethane exhibits excellent tensile property, elastic property and cavitation resistance when the hard content is low. Among them, the waterborne polyurethane coating containing 30% hard segment exhibits the best cavitation resistance.关键词
水性聚氨酯/硬段含量/穴蚀性能/超声波气蚀/100%定伸永久变形率/拉伸强度/伸长率Key words
waterborne polyurethane/hard-segment content/cavitation performance/ultrasonic cavitation/100% fixed elongation permanent deformation rate/tensile strength/elongation分类
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冯建东,齐育红,杨帆,张占平,奚江涛..硬段含量对TDI-BDO-PPG水性聚氨酯涂层穴蚀性能的影响[J].表面技术,2017,46(10):9-14,6.
