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Effect of polyisocyanate hardener on waterborne polyurethane adhesive containing different amounts of ionic groups

Effect of polyisocyanate hardener on waterborne polyurethane adhesive containing different... Abstract Waterborne polyurethane (WBPU) adhesive with varying amounts of dimethylol propionic acid (DMPA) was synthesized by prepolymer process and blended with polyisocyanate hardener. The mean particle size of the WBPU dispersion decreased with increasing DMPA content.1H NMR spectroscopy confirmed the formation of allophanate bonds and biuret bonds due to the reaction of hardener NCO with urethane/urea groups. The optimum NCO content with the greatest adhesive strength was dependent on the total content of urethane/urea groups in the WBPU molecules. The optimum NCO content increased with increasing number of urethane groups (DMPA content). The adhesion strength of WBPU adhesives was maximized at a molar ratio of hardener NCO to urethane/urea of about 0.28. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png "Macromolecular Research" Springer Journals

Effect of polyisocyanate hardener on waterborne polyurethane adhesive containing different amounts of ionic groups

"Macromolecular Research" , Volume 14 (6): 6 – Dec 1, 2006

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References (22)

Publisher
Springer Journals
Copyright
2006 The Polymer Society of Korea and Springer
ISSN
1598-5032
eISSN
2092-7673
DOI
10.1007/BF03218736
Publisher site
See Article on Publisher Site

Abstract

Abstract Waterborne polyurethane (WBPU) adhesive with varying amounts of dimethylol propionic acid (DMPA) was synthesized by prepolymer process and blended with polyisocyanate hardener. The mean particle size of the WBPU dispersion decreased with increasing DMPA content.1H NMR spectroscopy confirmed the formation of allophanate bonds and biuret bonds due to the reaction of hardener NCO with urethane/urea groups. The optimum NCO content with the greatest adhesive strength was dependent on the total content of urethane/urea groups in the WBPU molecules. The optimum NCO content increased with increasing number of urethane groups (DMPA content). The adhesion strength of WBPU adhesives was maximized at a molar ratio of hardener NCO to urethane/urea of about 0.28.

Journal

"Macromolecular Research"Springer Journals

Published: Dec 1, 2006

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