Alkyd/polycaprolactone modified polyester (THAS) was synthesized by introducing 3,5,5-trimethylhexanoic acid and polycaprolactone chosen as the component of alkyd and polycaprolactone polyol into modified polyester. Two-component polyurethane coatings were prepared by blending polyisocyanate, pigment, wetting/dispersing agent, and flowing agent into the synthesized THAS. The film was coated with the prepared coatings, and various properties were examined. They showed good physical properties such as pot-life, flexibility, impact resistance, cross hatch adhesion, fineness of grind, rust resistance, abrasion resistance, yellowness index, and lightness index difference. Drying time was a little decreased, and the rest of properties were comparable to existing coatings.

알키드 폴리올과 폴리카프로락톤 폴리올 성분으로 3,5,5-trimethylhexanoic acid와 폴리카프로락톤을 각각 택하여 변성폴리에스테르에 도입함으로써 알키드/폴리카프로락톤 변성폴리에스테르(THAS)를 합성하였다. 합성된 THAS에 폴리이소시아네이트, 안료, 습윤·분산제 및 플로우개량제 들을 블렌드하여 2성분계 폴리우레탄 도료를 제조하였다. 제조된 도료를 시료로 택하여 도막처리를 한 다음 각종 물성시험을 거친 결과, 변성폴리에스테르에 알키드 폴리올과 폴리카프로락톤 폴리올의 도입으로 인하여 변성폴리에스테르 성분의 기존 도료와 비교하여 가사시간, 굴곡성, 내충격성, 접착성, 연화도, 방청성, 내마모성, 황변도 및 명도지수차 등이 양호하게 나타났고, 건조시간은 다소 저하되었으며, 나머지 물성들은 기존 도료와 거의 비슷하게 나타났다.

Keywords: two-component; polyurethane coatings; alkyd/polycaprolactone modified polyester