Influence of the hard-to-soft segment ratio on the adhesion of water-borne polyurethane adhesive

Authors: Pérez-Limiñana, M. Angeles¹; Arán-Aís, Francisca¹; Torró-Palau, Ana M.¹; Orgilés-Barcel, César¹; Martín-Martínez, José Miguel²

Source: Journal of Adhesion Science and Technology, Volume 21, Number 8, 2007 , pp. 755-773(19)

Publisher: VSP, an imprint of Brill

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Abstract:

Three water-borne polyurethane dispersions were synthesised by the pre-polymer mixing process. Different hard segment contents in the polyurethanes were obtained by varying the diisocyanate/macroglycol (NCO/OH) molar ratio. A decrease in the NCO/OH ratio produced an increase in the mean particle size and in the pre-polymer viscosity, as well as a decrease in the molecular weight of the polyurethane. On the other hand, the lower the NCO/OH ratio, the more crystalline the polyurethane and the lower the resistance to flow at high temperature. Lower NCO/OH ratios improved the thermal degradation stability of the polyurethane. Finally, a high initial adhesion to PVC was obtained in all joints produced with the aqueous polyurethane dispersions and the final adhesion increased as the NCO/OH ratio in the water-borne polyurethane adhesive decreased.

Keywords: WATER-BORNE POLYURETHANE ADHESIVES; HARD-TO-SOFT SEGMENT RATIO; ADHESION TO PVC; SHOE INDUSTRY

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856107781362635

Affiliations: 1: INESCOP, Footwear Research Institute, 03600 Elda, Alicante, Spain 2: Adhesion and Adhesives Laboratory, University of Alicante, 03080 Alicante, Spain

Publication date: 2007-06-01