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

Loading next page...
 
/lp/springer_journal/synthesis-and-characterization-of-water-borne-diisocyanate-sgeki8dnv6
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

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off