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Abstract

A long-lasting water-repellency textile application that uses a polydimethylsiloxane (PDMS)-containing polyurethane (PU) involves a manufacturing process of NCO-terminated PU prepolymer of PDMS diols and polyisocyanate with a catalyst for forming a moisture-curable PDMS-containing PU oligomer, or becoming an UV-curable PDMS-containing PU oligomer after a chemical reaction takes place. The PU oligomer owns PDMS moiety with water-repellent properties. The moisture- or UV-curable PU with NCO and acrylate end-groups can create cross-linked polymeric networks between fibers of textiles by exposing to the air or UV-radiation. The final cross-linked PDMS-containing PU treated textile demonstrates long-lasting water-repellent properties with an excellent soft hand feel and a breathable feature. Furthermore, the textile water-repellent treatment is cost-effective, and most importantly these two different curing processes could be carried out at ambient temperature without requiring any waste water discharge. Therefore, these textile water repellent treatments are considered as environmental friendly green processes.

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