아세토아세톡시기 함유 80% 고형분인 아크릴수지의 하이솔리드 도료에의 적용

Application of Acrylic Resins Containing Acetoacetoxy Group and 80% Solid Contents to High-Solid Coatings

In order to prepare high-solid coatings, first acrylic resins (HSAs) which contain 80% solid were synthesized, and then the prepared resins were cured with isocyanate at room temperature. In the synthesis of HSAs, viscosity, number average molecular weight (Mn) and conversion were 1372{sim}2700 cps, 1520{sim}1650 and 83{sim}87%, respectively. Among the four kinds of initiators used, tert-amylperoxy-2-ethyl hexanoate was the most proper one in the synthesis of HSAs. With increasing Tg values, viscosity increased rapidly and molecular weight increased slowly. As a result of the examination of coated films, it was found that 60^{circ} specular gloss, impact resistance, heat resistance and cross-hatch adhesion were good, and pencil hardness, drying time and pot life were poor.