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Facile Construction of Robust Super-hydrophobic Coating for Urea-formaldehyde Foam: Durable Hydrophobicity and Self-cleaning Ability
Composites Part A: Applied Science and Manufacturing ( IF 8.1 ) Pub Date : 2020-02-12 , DOI: 10.1016/j.compositesa.2020.105831
Buyong Wu , Lin Ye , Zhao Zhang , Xiaowen Zhao

A robust super-hydrophobic coating was constructed on the surface of urea-formaldehyde (UF) foams through a facile immersion process in SiO2 nanoparticle-dispersed ethanol solution with dodecyltrimethoxysilane (DTMS) as compatibilizer. By introduction of DTMS, strong hydrogen bonding interaction formed between SiO2 coating and UF foam. The UF-g-SiO2/DTMS foam showed a water contact angle (CA) of 157.2° and a sliding angle (SA) of 3°, and after long-term immersion, very slight change of CA and SA was observed, while the water absorption ratio was 36.89% lower than that of pristine sample, displaying durable super-hydrophobicity. The UF-g-SiO2/DTMS foam showed excellent self-cleaning ability. Introduction of DTMS improved the dispersion of SiO2 in solution and thus lots of bamboo shoot-shaped granular protrusions of SiO2 nanoparticles at micro/nano-scale formed on the foam surface during treatment process, while the strong interfacial interaction prevented SiO2 nanoparticles from falling off the foam after long-term immersion, and thus durable hydrophobicity was achieved.



中文翻译:

尿素-甲醛泡沫坚固耐用的超疏水涂层的构造:持久的疏水性和自清洁能力

通过十二烷基三甲氧基硅烷(DTMS)作为增容剂,通过在SiO 2纳米颗粒分散的乙醇溶液中的轻松浸渍过程,在尿素-甲醛(UF)泡沫表面上构建了坚固的超疏水涂层。通过引入DTMS,SiO 2涂层和UF泡沫之间形成了很强的氢键相互作用。UF-g-SiO 2 / DTMS泡沫的水接触角(CA)为157.2°,滑动角(SA)为3°,长期浸泡后,观察到CA和SA的变化很小,而吸水率比原始样品低36.89%,显示出持久的超疏水性。UF-g-SiO 2/ DTMS泡沫具有出色的自清洁能力。DTMS的引入改善了溶液中SiO 2的分散性,从而在处理过程中在泡沫表面上形成了许多微米/纳米级的SiO 2纳米颗粒的竹状颗粒状突起,而强烈的界面相互作用阻止了SiO 2纳米颗粒的产生。长期浸泡后会从泡沫上掉下来,从而获得持久的疏水性。

更新日期:2020-02-12
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