Yellowing-resistant Nonionic Waterborne Polyurethane for Leather Finishing Applications
Polyurethane finishing materials are susceptible to yellowing under the influence of ultraviolet light or heat for a long period of time,which affects the aesthetics and service life of the materials.The UV absorbent UV-320 and 2-hydroxyethyl disulfide were introduced into the polyurethane chain extension to prepare the yellow-resistant non-ionic waterborne polyurethane,and then applied to leather spraying.Through color difference,stability,scanning electron microscopy,X-ray spectroscopy and other tests,it was found that the total color difference △E of the leather treated with 50 parts of yellowing-resistant nonionic aqueous polyurethane in the step of mid-coating was 2.9,and the discoloration grade was 1 and only a very slight discoloration.Combined with the basic performance indexes of tensile strength and abrasion resistance of the leather,it shows that the prepared yellowing-resistant polyurethane can greatly improve the yellowing-resistant performance while maintaining the mechanical properties,abrasion-resistant performance of the leather.
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