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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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疏水性含氟聚氨酯的合成及其耐气蚀磨损性能的研究
DOI: 10.11777/j.issn1000-3304.2015.14429, PP. 808-818
Keywords: 含氟聚氨酯,有机氟膜,过流部件,疏水性,耐气蚀磨损性能
Abstract:
采用全氟烷基乙醇(TEOH-10)对二苯基甲烷二异氰酸酯(MDI)进行修饰的方法引入氟元素,同时通过控制反应过程中MDI加入用量和时机,制备了无亲水性—CH2OH基团、且具备含氟链段的聚氨酯(FPU).耐水性实验表明,由于低表面能的氟碳链(—CF2CF3)向材料表面迁移,并在表面形成"荷叶疏水效应"的有机氟膜,FPU表现出很强的疏水性,当TEOH-10的摩尔用量为MDI理论用量的0.3~0.5之间时,FPU的吸水率仅在0.0146%~0.0182%之间,并在吸水浸泡实验浸泡3200h后保持10.31~10.79MPa的高粘结力;抗冲蚀磨损实验结果表明,FPU涂层具有优异的抗冲磨和气蚀性能,随着氟含量的增加,聚氨酯硬段组分中含氟F-MDI分子间的内聚能增加,提高了硬段微区的弹性模量和抗张强度,并通过氢键结构协同软段分子链的运动,缓冲了高速磨损颗粒和气泡溃灭时对涂层产生巨大反复的冲击力,使FPU的空蚀量由2.3756×10-3kg降低到0.9334×10-3~1.2454×10-3kg之间,涂层的耐气蚀磨损性能得到明显提高.综合考量水下过流部件防护涂层实际应用的性能要求,当TEOH-10/MDI的摩尔比约为0.5,即氟元素的质量百分数约为9.39%时,FPU具备较好的耐水性能、粘结力和耐气蚀磨损性能,可望用作于一些气蚀现象严重的水下过流部件的防护涂层.
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