Abstract
A new hydrophobic hexyltrimethoxysilane (HTMS) coating for polyester fabric was successfully synthesized via a one-step water-based sol-gel method under acidic condition. Five different molar ratios of HTMS: water (1;40, 1:30, 1:20, 1:12 and 1:3) were prepared and the solution was deposited onto the polyester fabric by a simple dip-pad-cure process. The effect of water content on hydrophobicity was evaluated by manual testing on the treated polyester fabric samples. The effectiveness of hydrophobicity properties was further characterized using water contact angle (WCA) measurement. The optimized molar ratio of 1:3 was found to obtain the best hydrophobic property of 136.2° with particle size 115.3 µm measured using Particle Size Analyzer (PSA). Fourier transform infrared spectroscopy (FTIR) analysis confirmed the success of sol gel process with the presence of Si-O-Si band, which was also determined using energy dispersive X-ray spectroscopy (EDX). The Scanning Electron Microscopy (SEM) images revealed a good surface morphology of the homogenous thin xerogel coating with no visible cracks. Using HTMS without combinations of other precursors resulted in rough surface structure due to the low surface energy caused by long-chain alkyl silane in the HTMS coating and this provided the treated polyester fabric with good hydrophobicity. Doi: 10.28991/esj-2021-01309 Full Text: PDF
Highlights
Water-repellent coating helps to repel water by infusing the characteristic of “lotus effect” on the surface of material
A molar ratio of 1:3 was selected as the best molar composition as it produces the highest hydrophobicity on the coated polyester fabric
The water contact angle obtained for 1:3 molar ratio HTMS:H2O coated on polyester fabric was 136.2° by using sessile drop method
Summary
Water-repellent coating helps to repel water by infusing the characteristic of “lotus effect” on the surface of material. The superhydrophobic surface of cotton was fabricated using silica nanoparticles, zinc oxide (ZnO) nano-rods and decyltrimethoxysilane (DTMS) [13]. We present a simple, fast, low cost and environmentally friendly water-based sol-gel process to prepare hydrophobic coating by using HTMS in the presence of the acid catalyst. HTMS was used as precursor in this research due to its good adhesion to the substrate which may increase the water contact angle [16]. It serves as a cross linker resulting in dense and less hydrophilic of the substrate [17]. The prepared hydrophobic fabric has preserved its softness and smoothness providing comfort to the wearer
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