Abstract
Hydroxyl-terminated polyesters are the most common polyols that are crosslinked through an isocyanate group. In this study, the polyester polyol resins were synthesized by using 1,4-cyclohexanedimethanol (1,4-CHDM) with the mixture of different diacids as 1,3-cyclohexanedicarboxylicacid (1,3-CHDA), 1,4-cyclohexanedicarboxylicacid (1,4-CHDA), isophthalic acid (IPA), adipic acid (AA), and azelaic acid (AZA). The solubility and viscosity of these polyester polyol resins were determined by using suitable solvent. All the polyester polyols were crosslinked with HDI isocyanurate and IPDI trimer to form polyurethane coating films. These films were evaluated for their mechanical, thermal, and chemical resistance properties. The studies on film characteristics reveal that the cycloaliphatic diacids afforded polyurethane with greater performance properties than that of aromatic and linear aliphatic diacids.
References
Blank, WJ, “Novel Polyurethane Polyols for Waterborne and High Solids Coatings.” Prog. Org. Coat., 20 235–259 (1992)
Ming, Z, Denggao, J, Cuihong, H, “The Effect of Isocyanate Index-NCO/-OH on the Structure of Polyurethane Dispersion.” Paint India, 55 59–67 (2005)
O’Brien, ME, Hillishafer, DK, Williamson, EH, “A Hot Formula.” Adhes. Age, 44 (11) 20–25 (2001)
Sen, A, “Protective Coating for Maintenance Engineers – One Approach.” Paint India, XLIX (11) (1999)
Manari, VM, Massingill Jr, JL, “Two-component High Solid PU Coating System Based on Soy Polyols.” J. Coat. Technol. Res., 3 (2) 151–157 (2006)
Hood, JD, Blount, WW, Sade, WT, “Polyester Resin Synthesis Techniques for Achieving Lower VOC and Improved Coating Performance.” J. Coat. Technol., 58 (739) 49–52 (1986)
Wicks, ZW, Jones, FN, Pappas, SP, “Organic Coatings Science and Technology.” In: Film Formation, Components and Appearance, I, ISBN-0471614068, Chapter 8. Wiley, New York (1992)
Ni, H, Daum, JL, Thiltgen, PR, “Cycloaliphatic Polyester-based High-solid Polyurethane Coatings. The Effect of Difunctional Acid.” Prog. Org. Coat., 45 49–58 (2002). doi:10.1016/S0300-9440(02)00100-5
Pilati, F, Toselli, M, Messori, M, Sanders, D (eds.), Water-borne and Solvent-based Saturated Polyesters and Their End User Applications, Chapter 2. Wiley, New York (1999)
Gregorovich, BV, Hazan, I, ‘‘Environmental Etch Performance and Scratch and Mar of Automotive Clearcoats.’’Prog. Org. Coat., 24 131–146 (1994) doi:10.1016/0033-0655(94)85011-9.
Roesler, RR, Grace SA, Polym. Mater. Sci. Eng., 83 327, Am. Chem. Soc. Div. (2000)
Andriu, VJ, Laurent, P, ‘‘Air Convective Drying and Curing of Polyurethane Based Paints on Sheet Molding Compound Surfaces.’’ J. Coat. Technol., 70 (882) 67–76 (1998)
Shoemaker, SH, ‘‘Two-Component Isopolyester Urethane Coatings for Plastic.’’ J. Coat. Technol., 62 (787) 49–55 (1990)
Kubitza, W, ‘‘Water Based Two-Pack Polyurethane Paints.’’ J. Oil Color Chem. Assoc., 75 340–347 (1992)
Hood JD, Blount, WW, Sade, WT, “Polyester Resin Synthesis Techniques for Achieving Lower VOC and Improved Coating Performance.” J. Coat. Technol., 58 (739) 49–52 (1986)
Haseebuddin, S, Padmavati, T, Raju, KVSN, “Influence of Dibasic Acids on the Properties of Modified Polyurethane Coatings.” Surf. Coat. Int., 78 68 (1995)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Awasthi, S., Agarwal, D. The effect of difunctional acids on the performance properties of polyurethane coatings. J Coat Technol Res 6, 329–335 (2009). https://doi.org/10.1007/s11998-008-9121-9
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11998-008-9121-9