Abstract
Superamphiphobic and flame-retardant finishing of cotton fabric can significantly improve its protective properties to expand its applications, such as protective clothing. However, creating such materials is still a challenging issue. Herein, we present a facile strategy to fabricate superamphiphobic and flame-retardant cotton fabric (SFC) via step-by-step dip-coating and spraying technology. Ammonium polyphosphate (APP) endows cotton fabric excellent flame retardancy. The robust coating formed by the polymerization product of ethyl 2-cyanoacrylate and 1H,1H,2H,2H-perfluorooctyl trichlorosilane (FOCS) can not only protect APP from being damaged but also trap air to form "air plastron", which makes SFC have excellent antifouling, chemical repellence and self-cleaning. The resulting SFC exhibited superamphiphobicity and flame retardancy with water contact angle of 161°, oil contact angle of 158° and LOI of 30%. After UV irradiation, mechanical damage, 180 °C oven heating and ultrasonic washing, it still maintains excellent hydrophobicity without loss of flame retardancy. This study expands the potential applications of cotton and provides feasible technologies for improving the overall efficiency of cotton.Graphic abstract
Highlights
Superamphiphobicity is an special surface effect, which are both superhydrophobic and superoleophobic 1.Tsujii's group[2,3] first reported on super water and oil repellent surfaces, which has become one of the most popular research topics in recent years
In recent years, it has been discovered that materials containing long perfluoroalkyl groups (Rfn, n≥8) accumulate in human and animal tissues, and have a long biological half-life, which have been banned in many countries[8]
We designed the superamphiphobic and flame-resistant cotton fabric according to the following criteria: (1) the fabric should be highly effective flame retardant; (2) the surface of the fabric should be superamphiphobic to resist harmful substance; (3) the coatings of fabric must be mechanically robust and durable to withstand common damages
Summary
Superamphiphobicity is an special surface effect, which are both superhydrophobic and superoleophobic 1. As one of the most advanced surface technologies, superamphiphobic finishing has been applied to the textile field. The common method is to gradually finish flame-retardant and hydrophobic of the cotton fabric. Superamphiphobic and flame-retardant cotton fabric will have better self-cleaning, anti-fouling and chemical resistance, but it have not demonstrated in the research literatures. The fabrication of superamphiphobic and flame-retardant cotton fabric (SFC) was fabricated using a step-by-step dip-coating and spraying technology (Fig 1). The preparation method and mechanism of the superamphiphobic flame-retardant coating proposed in this study have certain guiding and reference significance in improving the functionality and bonding fastness of other textile coatings
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