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http://dx.doi.org/10.5764/TCF.2009.21.6.001

A Study on the Self-cleaning Surface Finishing Using PFOA Free Fluoric Polymer and Silica Nano-sol  

Park, Sung-Min (Korea Dyeing Technology Center)
Kwon, Il-Jun (Korea Dyeing Technology Center)
Kim, Ran (Dept. of Advanced Organic Materials Science & Engineering, Kyungpook national university)
Yeum, Jeong-Hyun (Dept. of Advanced Organic Materials Science & Engineering, Kyungpook national university)
Yoon, Nam-Sik (Dept. of Textile System Engineering, Kyungpook national university)
Lee, Kyeung-Nam (Daegu Gyeongbuk Design Center)
Publication Information
Textile Coloration and Finishing / v.21, no.6, 2009 , pp. 1-11 More about this Journal
Abstract
Super-hydrophobic surface, with a water contact angle greater than $150^{\circ}$, has a self cleaning effect termed 'lotus effect'. We introduced super-hydrophobicity onto aramid/rayon mixture fabric with dual-scale structure by assembling silica nano-sol. Mixture fabric was treated with silica nano-sol, fluoric polymer using various parameters such as particle size, concentration. Silica nano-sol size were measured using particle size analyzer. Morphological changes by particle size were observed using field emission scanning electron microscopy(FE-SEM), contact angle measurement equipment. The contact angle of water was about $134.0^{\circ}$, $137.0^{\circ}$, $143.0^{\circ}$, $139.5^{\circ}$ and $139.0^{\circ}$ for mixture fabric coated with 100.2nm, 313.7nm, 558.2nm, 628.5nm and 965.4nm silica nano-sol, compared with about $120.0^{\circ}$ for mixture fabric coated with fluoric polymer. When we mixed particle sizes of 100.2nm and 558.2nm by 7:3 volume ratio, the contact angle of water was about $146.2^{\circ}$. And we mixed particle sizes of 313.7nm and 558.2nm by 7:3 volume ratio, the contact angle of water was about $141.8^{\circ}$. Also we mixed particle sizes of 558.2nm and 965.4nm by 7:3 volume ratio, the best super-hydrophobicity was obtained. In this paper, we fabricated the water-repellent surfaces with various surface structures by using four types of silica nano-sol, and we found that the dual-scale structure was very important for the super-hydrophobicity.
Keywords
PFOA; Sol-Gel; super-hydrophobic; Lotus effect; contact angle; silica;
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