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The Reactivity of Different Polyols for Paint to Polyisocyanate  

Seo, Seok-Hwan (Department of Industrial Chemistry, Pukyong National University)
Suh, Cha-Soo (Department of Industrial Chemistry, Pukyong National University)
Park, Jin-Hwan (Department of Industrial Chemistry, Pukyong National University)
Publication Information
Applied Chemistry for Engineering / v.19, no.4, 2008 , pp. 388-396 More about this Journal
Abstract
2 Components polyurethane coatings are widely used for the industrial coating in general because of its excellent film performance and the workability which were brought by the 3 dimensional cross linked chain structures being formed after the reaction between polyol and polyisocyanate. 2 components polyurethane can be classified into alkyd polyol, polyester polyol, acrylic polyol and polyester modified acrylic polyol depending on where it is used. This research was conducted under the conditions below; different chemical compositions of resin for paint, set the same conditions of viscosity, thinner and acid value, set alternative polyols, OH values and catalysts, set alternative polyisocyanate hardeners of the paint, measure the reaction rates and dynamic mechanical characteristics using RPT-3000, Rotation Rheometer, DMA and FTIR. The research found that the reactivity between polyol and isocyanate influences the film performance and workability depending on the catalysts, OH values and chemical compositions. We find out that different reaction rate of acrylic polyol and polyester modified acrylic polyol with poly-isocyanate is not influenced on temperature and catalyst. In addition, reaction speed of high hydroxyl content polyol is faster than low hydroxyl equivalent. These results can improve difficult working condition to apply urethane coating.
Keywords
polyurethane; DMA; polyol; FTIR; OH values; workability;
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