자외선 경화형 광학 수지의 광안정화와 다구찌 방법을 이용한 자외선 경화 공정 최적화

Abstract

(2) The photostabilization and cure kinetics of UV-curable optical resins containing various formulations of photostabilizers have been investigated to determine the system with the highest cure conversion and durability. Photo-DSC analysis revealed that increasing the concentration of a UV absorber(UVA) decreased both the crosslink density and the cure rate due to competition for the incident photons between the photoinitiator and the UVA, whereas including a hindered amine light stabilizer (HALS) hardly affected either the cure conversion or the cure rate due to its absorption being very low at 365nm. This result was confirmed by FTIR-ATR spectroscopy and UV-visible spectroscopy analysis. QUV ageing experiments showed that the cure conversion and durability were highest for the formulation with UVA and HALS at a ratio of 1:2, which is due to their synergistic action.