New development of polyurethane dispersion derived from blocked aromatic diisocyanate

S. Subramani, Young Jun Park, Young Soo Lee, Jung-Hyun Kim

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

Making water dispersible/reducible blocked-isocyanates facilitates incorporation of blocked-isocyanates into an aqueous dispersion of co-reactant. Anionically modified methyl ethyl ketoxime (MEKO), ε-caprolactam (CL) and 3,5-dimethylpyrazole (DMP) blocked aromatic diisocyanates (toluene 2,4-diisocyanate, TDI and 4,4′-diphenylmethane diisocyanate, MDI) dispersible isocyanate adducts were prepared by introducing ionic pendant groups and characterized by FT-IR, gel permeation chromatography (GPC), differential scanning calorimeter (DSC) and thermo-gravimetric analyses (TGA) techniques. It was found that molecular weights of MDI-based polyisocyanates were higher. Thermal studies showed that the de-blocking temperature of the isocyanate adducts decreases in the order: ε-caprolactam > methyl ethyl ketoxime > DMP. Gelation test was conducted by using the isocyanate adducts with hydroxyl functional aqueous polyurethane dispersion. It was also found that the dispersions of blocked adducts are stable and compatible with polyurethane (polyether and polyester based) and acrylic dispersions.

Original languageEnglish
Pages (from-to)71-79
Number of pages9
JournalProgress in Organic Coatings
Volume48
Issue number1
DOIs
Publication statusPublished - 2003 Nov 1

Fingerprint

Isocyanates
Polyurethanes
Dispersions
Caprolactam
Polyethers
Gel permeation chromatography
Gelation
Calorimeters
Oximes
Acrylics
Toluene
Polyesters
Molecular weight
Scanning
Toluene 2,4-Diisocyanate
Water
Hydroxyl Radical
Temperature
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Materials Chemistry

Cite this

Subramani, S. ; Park, Young Jun ; Lee, Young Soo ; Kim, Jung-Hyun. / New development of polyurethane dispersion derived from blocked aromatic diisocyanate. In: Progress in Organic Coatings. 2003 ; Vol. 48, No. 1. pp. 71-79.
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New development of polyurethane dispersion derived from blocked aromatic diisocyanate. / Subramani, S.; Park, Young Jun; Lee, Young Soo; Kim, Jung-Hyun.

In: Progress in Organic Coatings, Vol. 48, No. 1, 01.11.2003, p. 71-79.

Research output: Contribution to journalArticle

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