聚氨酯(脲)涂层冲蚀磨损性能研究

Study of Erosion Behavior of Polyurethane-urea Coating

选用不同比例的低聚合物多元醇、多元胺、扩链剂、催化剂和异氰酸酯制备聚氨酯(脲)弹性涂料,采用喷涂技术在玻璃试片上制备聚氨酯(脲)涂层,用Taber摩擦磨损试验机和高速含沙水射冲蚀磨损试验机评价聚氨酯(脲)涂层的耐磨性能,用扫描电子显微镜观察涂层的磨损表面形貌,分析涂层组分与其冲蚀磨损性能的关系.结果表明:聚氨酯(脲)涂层体系中主要成膜物质的组分对耐冲蚀磨损性能影响较大,随着活性氢组分中端胺基聚醚和胺类扩链剂含量增加,聚氨酯(脲)涂层的耐冲蚀磨损性能提高;由于聚氨酯/聚脲混合体系和聚氨酯涂层中大量气孔的存在,从而导致涂层冲蚀磨损量增加;纯聚脲涂层具有比聚氨酯/聚脲混合体系涂层优越的磨损性能,不仅在干摩擦条件下,在高速含水砂流冲蚀条件下也体现出优异的抗冲蚀性能,而且对冲蚀角的敏感性有所改善.

Polyurethane-urea elastic paint and its coating were prepared by different proportions of polyol, polyetheramine, hydroxyl terminated polyether, catalytic agent and isocyanate. The wearability of the coating was tested with Taber wear-and-tear experimental machine and high-pressure water jet erosion tester. The morphology of the coating was observed with SEM. The interrelation between the coating＇ s components and its erosion resistance was analyzed. The main components of the paint influenced greatly the wearability and anti-corrosion behavior of the coating. With increasement of polyetheramine and amine chain extender in the polyurethane-urea, the erosion re- sistance of the coating was improved. A great deal of poles in the polyurethane coating aggravated erosion. The pure polyurea coating was superior to the polyurethane-urea coating in wearability, both in the conditions of dry wearing and high-speed sand water, and the former reduced the sensitivity of erosion to jet angle.