Abstract
Three series of silicone modified polyurethane acrylate (SPUA) prepolymers were prepared from dicyclohexylmethane-4, 4′-diisocyanate (HMDI), PPG1000, triethylene glycol (TEG), 2-hydroxyethyl acrylate (HEA), and multi-hydroxyalkyl silicone (MI-III) with tris(trimethylsiloxy)silyl propyl side groups. Their structures were confirmed by 1H NMR, 13C NMR, and Fourier transformed infrared (FTIR) analysis, and SPUA films were obtained by UV curing. The properties of films were investigated by attenuated total reflection (ATR)-FTIR, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), water contact angle (WCA), thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), water and hexane resistance, and tensile testing. The results showed that the structures and dosages of MI-III could influence the polymerization properties, surface properties, water and n-hexane resistance, and thermal and tensile properties of SPUA. For instance, the surface aggregation of tris(trimethylsiloxy)silyl propyl groups (even ~2.5 wt%) could endow SPUA films with less microphase separation, good hydrophobicity, lipophilicity, thermal stability, and mechanical properties. Interestingly, obvious regular winkles appeared on the surfaces of SPUAIII films, which are characterized by relatively high WCA values. However, relatively smooth were observed on the surfaces of SPUAIII films, which also exhibit lower water absorption ratio values. Furthermore, the ordinary cotton textiles would be transformed into hydrophobic and oleophilic textiles after treating with SPUA simply, and they were used in the oil/water separation study. Among them, consistent with water and hexane resistance analysis of SPUA films, SPUAII treated cotton textiles are characterized by relatively small liquid absorption capacity (LAC) values. Thus, phenyl groups and side-chain tris(trimethylsiloxy)silyl propyl groups are helpful to improve the hydrophobicity and lipophilicity of SPUA films. SPUAII-5 (even with 5 wt% MII) treated cotton textiles could efficiently separate the oil/water mixture, such as n-hexane, cyclohexane, or methylbenzene with water. Thus, this material has great potential in the application of hydrophobic treatment, oil/water separation, and industrial sewage emissions, among others.
Highlights
The water repellents of textiles are widely used in hydrophobic surface treatment, oil/water separation and textile finishing, among others [1,2]
(0.020 mol) of hydroxyethyl acrylate (HEA) was added into the -NCO terminated prepolymer and the mixture was kept at 60 ◦ C for 4 h until the characteristic Fourier transformed infrared (FTIR) peak at ~2264 cm−1 disappeared
The multi-hydroxylalkyl compounds with tris(trimethylsiloxy)silyl propyl groups (MI-III) were used to construct photo-sensitive silicone modified polyurethane acrylate (SPUA)
Summary
The water repellents of textiles are widely used in hydrophobic surface treatment, oil/water separation and textile finishing, among others [1,2]. Their hydrophobicity is usually achieved by using fluorine compounds [3], silicone compounds [4], and aliphatic compounds [5]. The massive silicone dosages are necessary in order to guarantee sufficient sufficient surface segments for for high high hydrophobicity, hydrophobicity, as surface aggregation aggregation of of PDMS. Treated cotton textiles could be provided observed on the surfaces of SPUAII films, which exhibit lower water absorption ratio values.
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