A Study on Imparting Water Repellency to Recycled PET Nonwoven Fabrics Using Silica Sol and Silane Coupling Agent

In this study, silica sol and silane coupling agent hexadecyl trimethoxysilane (HDTMS) were used to improve the surface roughness of the recycled PET nonwoven fabrics to impart water repellency of the nonwoven fabrics. The effects of silica sol and silane coupling agent treatment on the surface morphology, chemical structure, surface roughness and water repellency of the recycled PET nonwoven fabrics were examined. As results of SEM observation, the silica particles showed a uniform distribution on the surface at low concentration of silane coupling agent, and with an increase of concentration of silane coupling agent, more agglomeration of the particles occurred. FT-IR results showed the specific peaks at 3,000, 1,000 and 791 cm-1 due to the axial deformation of Si-OH, Si-O-Si and Si-C bond, respectively. Surface roughness of recycled PET nonwoven fabrics increased by treatment with silica sol and silane coupling agent. It is thought to be because silica nano particles generated the micro irregularities on the surface. The water contact angle was greatly increased to 130o at 0.5% of silane coupling agent. It is thought to be due to reduction of surface free energy of the nonwoven fabrics by treatment with silica sol and silane coupling agent. It was confirmed that silica sol and silane coupling agent treatment is an eco-friendly surface modification method that can improve water repellency of nonwoven fabrics efficiently.

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A Study on Imparting Water Repellency to Recycled PET Nonwoven Fabrics Using Silica Sol and Silane Coupling Agent

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