Synthesis and Characterization of Anionic Polyester-Polyurethane Dispersion as Environmentally-Friendly Waterbased Resins

Author

Abstract

Aqueous polyurethane dispersions (PUDs) have recently emerged as important alternatives to their solvent-based counterparts for various applications due to increasing health and environmental awareness (green chemistry). Anionic polyester-polyurethane dispersions were synthesized by three steps. In the first step, macromonomer diisocyanate having carboxylic acid was prepared by isophorone diisocyanate (IPDI), dimethylol propionic acid (DMPA) in percent of acetone as solvent and dibutyldtin dilaurate (DBTDL) as catalyst. Then, carboxylic polyurethane was prepared by reaction macromonomer diisocyanate having carboxylic acid with linear aliphatic polyester (Mw=2000), trifunctional polyester (Mw=2800) and butanediol (BDO) as chain extender. The next step involved neutralization and dispersion in water, where acidic polyurethane was neutralized by the addition of triethylamine (TEA).  Factors influencing the synthesis of polyurethane dispersion mainly involve reaction temperature, reaction time, the concentration of catalyst, DMPA content and BDO content, were studied. The polymers have been characterized with DSC and FTIR.

Keywords


  1. Aminabhavi, 2006. Synthesis and characterization of crosslinked polyurethane dispersions based on hydroxylated polyesters. J Appl Polym Sci;99:368-80 and D. Klempner, 1987.
  2. Advances in Urethane Science and Technology, Technomic, Westport Chen, GN. and KN Chen, 1997. Self-curing behaviors of single pack aqueousbased polyurethane system. J Appl Polym Sci;63:1609-23. Coutinho, FMB. And MC. Delpech, 1996.
  3. Some properties of films cast from polyurethane aqueous dispersions David, D.J. and B. Staley, 1969. Analytical Chemistry of Polyurethanes, High Polymer Series. XVI, Part III. Dieterich D., W Keberle and H. Witt, 1970.
  4. Polyurethane ionomers, a new class of block polymers. Angew Chem.,9:40-50. Dieterich, D. 1981. Aqueous emulsions, dispersions and solutions of polyurethanes; synthesis and properties. Dieterich, D., W. Keberle and R. Wuest, 1970.
  5. Aqueous dispersions of polyurethane ionomers. J Oil Colloid Chem Assoc;53:363-79. Eisenberg, A., 1970 Clustering of ions in organic
  6. polymer A theoretical approach. Macromolecules.,3:147-54. Frisch K.C. and Klempner D. 1987
  7. Advances in Urethane Science and Technology, Technomic, Westport, 121-162 Jhon, YK., IW. Cheong and JH. Kim, 2001.
  8. Chain extension study of aqueous polyurethane dispersions. Colloid Surf A;179:71-8. Kim, BK., 1996. Aqueous polyurethane dispersions. Colloid Polym Sci 274:599-611. Kim, BK., TK. Kim and HM. Jeong, 1994.
  9. Aqueous dispersion of polyurethane anionomers from H12MDI/IPDI, PCL, BD, and DMPA. J Appl Polym Sci.,53:371-8