This diploma thesis aimed to study the effect of the sol-gel treatment of polyamide (PA) knit fabric on the developement of the high-tech textile with the protective properties. Fabrication of the high-tech polyamide knit fabric included three following procedures: sol-gel treatment with the pre-prepared SiO2 particles, in situ synthesis of SiO2 particles in the presence of the knit fabric, and coating with commercial perfluorinated siloxane agent (FAS) by a pad-dry-cure process. In order to investigate the washing fastness, samples were subjected to one (1PC) and four washing cycles (4PC). The morphological, chemical and mechanical-physical properties of untreated and treated samples were evaluated by scanning electron microscopy (SEM), infrared spectroscopy by Fourier transform (FT-IR), and measurements of air permeability and tensile strenght. The effect of apreture on the water and oil repellency was evaluated by measurements of static contact angles of water and n-hexadecane droplets, and water sliding (roll-off) angles. The results showed that air permeability and tensile strenght of the final treated knit fabric slightly decreased, compared to the untreated sample. The three-step modification process enabled the achievement of the static contact angle of water and n-hexadecane higher than 140° and 130°, respectively. This high-tech modification process of the PA knit fabric enables effective fabrication of the protective highly hydrophobic and highly oleophobic properties with good washing fastness and with performance close to the »Lotus effect«. The color difference between the treated and non-treated samples remains practically minimal, with neglible darkening in the treated samples.
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