Synthesis and characterization of water-borne diisocyanate crosslinkers from methyl ethyl ketoxime/2-methylimidazole-blocked aromatic isocyanates

Synthesis and characterization of water-borne diisocyanate crosslinkers from methyl ethyl... Water-borne blocked isocyanates (WBIs) were synthesized using toluene 2,4-diisocyanate (TDI), trimethylolpropane, dimethylolpropionic acid, 2-methylimidazole (2-MI), and methyl ethyl ketoxime (MEKO). The particle size, viscosity, pH, and storage stability of the WBI dispersions were studied and compared. De-blocking temperatures of the WBIs were characterized by Fourier transform infrared (FT-IR), differential scanning calorimetry (DSC), and thermo-gravimetric analysis (TGA) techniques. The thermal analysis revealed that MEKO-blocked TDI adducts and 2-MI-blocked TDI adducts started to de-block at about 70.7 and 125.2 °C, respectively. The storage stability results showed that all dispersions prepared were stable for more than 6 months. The dispersions prepared were all in liquid form and miscible (compatible) with acrylic dispersion. Gelation test results confirmed that MEKO-blocked isocyanate adducts dispersions de-block at higher temperatures and cure at faster rates than 2-MI-blocked isocyanate adducts dispersions. These anionically modified blocked isocyanate adducts can be used as potential crosslinkers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Synthesis and characterization of water-borne diisocyanate crosslinkers from methyl ethyl ketoxime/2-methylimidazole-blocked aromatic isocyanates

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Publisher
Springer Netherlands
Copyright
Copyright © 2012 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-012-0863-8
Publisher site
See Article on Publisher Site

Abstract

Water-borne blocked isocyanates (WBIs) were synthesized using toluene 2,4-diisocyanate (TDI), trimethylolpropane, dimethylolpropionic acid, 2-methylimidazole (2-MI), and methyl ethyl ketoxime (MEKO). The particle size, viscosity, pH, and storage stability of the WBI dispersions were studied and compared. De-blocking temperatures of the WBIs were characterized by Fourier transform infrared (FT-IR), differential scanning calorimetry (DSC), and thermo-gravimetric analysis (TGA) techniques. The thermal analysis revealed that MEKO-blocked TDI adducts and 2-MI-blocked TDI adducts started to de-block at about 70.7 and 125.2 °C, respectively. The storage stability results showed that all dispersions prepared were stable for more than 6 months. The dispersions prepared were all in liquid form and miscible (compatible) with acrylic dispersion. Gelation test results confirmed that MEKO-blocked isocyanate adducts dispersions de-block at higher temperatures and cure at faster rates than 2-MI-blocked isocyanate adducts dispersions. These anionically modified blocked isocyanate adducts can be used as potential crosslinkers.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Nov 1, 2012

References

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