Synthesis and Characterization of Nonionic Waterborne Polyurethane and Application to Wool Fabric Finishing

Abstract

A nonionic waterborne polyurethane(WPU) was synthesized by the self-emulsification method using polyether diol (N220), isophorone diisocyanate (IPDI), trimethylolpropane poly (ethylene glycol monomethyl ether) (N120), 1,4-butanediol (BDO) and trimethylolpropane (TMP) as the main materials. The effects of the NCO/OH ratio on the emulsion and film properties of NWPU were explored. The experimental results show that the NWPU prepared at an NCO/OH ratio of 1.1 has good emulsion stability and easy film formation, and the resultant film was elastic, soft, and transparent. The sample was used for wool finishing and the application performance was evaluated. When the NWPU dosage reached 40 g·L⁻¹, the fabric area felt shrinkage rate reduced from 8.97% to 4.75%, the pilling rating raised from grade 2–3 to grade 4, and the whiteness value only decreased by 3.87%.

Keywords

waterborne polyurethane / nonionic / wool finishing / anti-pilling / anti-shrinking

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