TITLE:
Waterborne Polyurethane from Polycaprolactone and Tetramethylxylene Diisocyanate: Synthesis by Varying NCO/OH Ratio and Its Characterization as Wood Coatings
AUTHORS:
Bosco Joseph Vincent, Balasubramaniyan Natarajan
KEYWORDS:
Waterborne; Polyurethane Dispersion; Wood Coatings; NCO/OH Ratio
JOURNAL NAME:
Open Journal of Organic Polymer Materials,
Vol.4 No.1,
January
10,
2014
ABSTRACT: Environmentally
friendly, polyacrylic-based
polyurethane dispersion (PUD) was synthesised using various molar ratios of polycaprolactone, dimethylolpropionic acid and tetramethyl
xylene diisocyanate. Synthesis was carried out in flowing nitrogen atmosphere.
The PUD’s preparations are free of NMP (n-methyl pyrrolidone), a toxic processing solvent generally
used during the preparation of PUD’s. The performance of the synthesised polyurethane dispersions with varying NCO/OH molar
ratio was tested on wood surface. The physical, chemical, thermal and
mechanical properties such as viscosity, particle size, chemical resistance,
thermal stability and taber
abrasion of applied polyurethane dispersion were carried out as a function of
NCO/OH molar ratio. The PUD’s
preparation with NCO/OH
ratio of 1.4 or 1.6 showed better performance as a wood finish and the results are described in
the present study.