Effect of annealing on the properties of waterborne polyurethane adhesive containing urethane-based thickener

Different amounts of hydrophobically modified ethoxylated urethane-based thickener (HEUR) were added to improve the rheology of waterborne polyurethane adhesives. The thickened solid adhesive films were thermally annealed and characterised by IR spectroscopy, plate–plate rheology, dynamic mechanical...

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Bibliographic Details
Published in:International journal of adhesion and adhesives 2009-12, Vol.29 (8), p.774-780
Main Authors: Orgilés-Calpena, Elena, Arán-Aís, Francisca, Torró-Palau, Ana M., Orgilés-Barceló, César, Martín-Martínez, José Miguel
Format: Article
Language:English
Subjects:
Annealing
Application fields
Applied sciences
Environmental issues
Exact sciences and technology
Polymer industry, paints, wood
Polyurethane
Rheology
Technology of polymers
Water based
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Summary:Different amounts of hydrophobically modified ethoxylated urethane-based thickener (HEUR) were added to improve the rheology of waterborne polyurethane adhesives. The thickened solid adhesive films were thermally annealed and characterised by IR spectroscopy, plate–plate rheology, dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Hydrogen bonds played a key role in the thickening mechanism of polyurethane dispersions containing urethane-based thickener, along with ionic adsorption and micelles formation between hydrophobic groups. The adhesion properties were measured from T-peel test of leather/polyurethane adhesive/vulcanised styrene-butadiene rubber joints. Optimal results were obtained when water in the waterborne polyurethane adhesive (just before joint formation) was removed under open air, while forced air drying impeded the complete removal of water. On the other hand, the thermal annealing did not greatly affect the rheological and thermal properties of the thickened polyurethanes.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2009.06.001