Aminopropyl terminated polydimethylsiloxane was synthesized by hydrosilylation reaction with hydride terminated polydimethlysiloxane and allyl amine. Polydimethylsiloxane modified urea with isocyanate group was prepared from cyclic trimer of hexamethyldiisocyanate with aminopropyl terminated polydimethylsiloxane. Polydimethylsiloxane modified urea/acrylate resin (PUA) was prepared from the urethane reaction of PU with isocyanate group and 2-hydroxyethylmethacrylate. PUA structure was analyzed by FTIR and NMR. Coating materials were prepared by mixing PUA, acrylic monomer, photo-initiator, and solvent and coated on PET film to obtain flexible hard coating film by UV irradiation.

Hydride terminated polydimethylsiloxane과 allyl amine을 hydrosilylation 반응으로 aminopropylpolydimethylsiloxane을 합성하고, 이를 hexamethylenediisocyanate(HDI)의 고리화 반응으로 제조된 cyclic HDI trimer와 반응시켜 urea결합으로 결합된 polydimethylsiloxane 변성 urea을 제조하였다. Polydimethylsiloxane 변성 urea의 말단에 있는 isocyante기와 2-hydroxyethylmethacrylate를 반응시켜 말단에 multi acrylate기가 도입된 polydimethylsiloxane 변성 urea/acrylate(PUA)를 제조하였다. 제조한 화합물의 구조를 FTIR, 1H NMR로 확인하였으며, PUA에 아크릴계 단량체, 광 개시제, 용매 등을 여러 가지 조성비로 혼합하여 코팅 액을 제조하였으며 이를 PET 필름에 도포하고 UV을 조사하여 고경도의 유연성을 갖는 코팅 막을 제조하였다. 제조한 코팅 막의 연필 경도는 3H, 접촉각은 82°, bendability는 7 φ까지 scratch가 발생하지 않았다.

Keywords: allyl amine; polydimethylsiloxane; UV curing; pencil hardness.