Preparation and performance analysis of superhydrophobic cotton fabrics based on silicone-modified polyurethane/silica
To improve the hydrophobic property of cotton fabrics finished with waterborne polyurethane,a cross-linked waterborne silicone-modified polyurethane(WSPU)emulsion was prepared by using side chain polydimethylsiloxane and silane coupling agent KH550,followed by spraying hydrophobic silica particle(SiO2)dispersion on the surface of the WSPU dipped-rolled cotton fabrics to produce WSPU/SiO2 finished superhydrophobic cotton fabrics.We investigated the effect of KH550 mass fraction on the properties of the latex films obtained after drying WSPU emulsion and the relationship between the structure and properties of the WSPU/SiO2 finished cotton fabrics.The results showed that when the mass fraction of KH550 was 3.0％,the WSPU latex films had good mechanical properties and hydrophobicity.When the mass fraction of SiO2 dispersion was 1.0％,the surface of the WSPU/SiO2,composite finished cotton fabrics was enriched with silicon elements and had a micro-nano composite structure,the water contact angle of the fabric reached 151.8° and the sliding angle was 4.8°,showing good self-cleaning and anti-adhesive properties.Due to the physical force and the chemical interaction between the composite coating and the fibers,the composite finished cotton fabrics had excellent water washing durability,the water contact angle only decreased by 3.0° after 20 washing tests.This study provides reference for the preparation of superhydrophobic fabrics with stable properties.
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万方数据
维普
