Synthesis and Application of a New Phosphate Ester Based on Nonionic Amphiphilic Polyurethane as Leather Fatliquoring Agent

Abstract

A new polyurethane phosphate ester (PUP-2) was successfullysynthesized based on a nonionic amphiphilic polyurethane(PU-2). The structures and properties of PU-2 and PUP-2 werecharacterized by FTIR and surface tensiometer. The fatliquoringexperiments were carried out in three different groups (treated withPUP-2 alone, with the complex of hexadecyl phosphate ester (SLP)and PUP-2, or with the complex of SLP, PUP-2 and othercommercialized fatliquoring agents, respectively). The physical andorganoleptic properties of the resultant leathers were investigatedand SEM was carried out in the study of fiber splitting. The leatherstreated in the three different fatliquoring experiments all did nothave fatty spew defect. Furthermore, the resultant leathers treatedwith PUP-2 alone or with the complex of SLP and PUP-2 had theadvantage of resistance to yellowing. This new phosphate estermeets the requirements for the leathers with a good performance inresistance to yellowing and avoiding fatty spew defect.