Fabrication of superhydrophobic SiO2/epoxy resin/fluorinated alkylsilane nanocomposite coatings on wood surfaces

TU Kunkun, KONG Lizhuo, WANG Xiaoqing

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2017, Vol. 41 ›› Issue (06) : 158-162.

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2017, Vol. 41 ›› Issue (06) : 158-162. DOI: 10.3969/j.issn.1000-2006.201609028

Fabrication of superhydrophobic SiO2/epoxy resin/fluorinated alkylsilane nanocomposite coatings on wood surfaces

  • TU Kunkun, KONG Lizhuo, WANG Xiaoqing
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Abstract

【Objective】In order to obtain mechanically durable superhydrophobic wood, a superhydrophobic nanocomposite film using silica/epoxy resin/fluorinated alkylsilane(FAS)was constructed on the wood surface.【Method】Superhydrophobic organic/inorganic nanocomposite coatings were fabricated on wood surfaces via a two-step process, which involved the application of a primer coating of transparent epoxy resin to cover the naturally micro-grooved surface structure, and subsequent construction of a superhydrophobic nanocomposite film using silica/epoxy resin/FAS. The surface morphology and chemistry of the superhydrophobic coatings were characterized by field-emission scanning electron microscopy(FE-SEM), atomic force microscopy(AFM), and fourier transform infrared spectroscopy(FTIR). The hydrophobicity, oleophobicity, and mechanical durability of the coated wood were tested. 【Result】The results indicated that the well-developed microstructures with dual-scale roughness patterns and the low-surface-energy FAS in the coatings are believed to be responsible for the good superhydrophobicity(with a water contact angle of 153° and a sliding angle less than 4°)and oleophobicity(with a glycol contact angle of 146° and a sliding angle less than 11°). The water contact angles and sliding angles of the coated wood exhibited negligible changes after repeated abrasion by sandpaper, indicating sustainable non-wetting properties. Meanwhile, the surface microstructures with dual-scale roughness and the low-surface-energy materials in the coatings were retained, exhibiting remarkable durability against sandpaper abrasion. 【Conclusion】In this organic/inorganic hybrid coating system, the epoxy resin acts as a binder to anchor the SiO2 nanoparticles tightly on the wood substrate, thus endowing the superhydrophobic coatings with remarkable mechanical durability.

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TU Kunkun, KONG Lizhuo, WANG Xiaoqing. Fabrication of superhydrophobic SiO2/epoxy resin/fluorinated alkylsilane nanocomposite coatings on wood surfaces[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2017, 41(06): 158-162 https://doi.org/10.3969/j.issn.1000-2006.201609028

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