KCS

For the preparation of high functional hydrogel ophthalmic lens, the copolymer containing 2-chloropyridine-4-carboxylic acid as additives were manufactured and also the physical properties of the produced hydrogel ophthalmic lenses were measured. In this study, 2-chloropyridine-4-carboxylic acid with, EGDMA (ethylene glycol dimethacrylate), HEMA (2-hydroxyethyl methacrylate), MMA (methyl methacrylate), AA (Acylic acid) and the initiator AIBN (azobisisobutyronitrile) were used for thermal copolymerization. The mixture was heated at 115 ℃ for 40 mins to produce the hydrogel soft contact lens by cast mould method. The measurements of water content, refractive index and visible transmittance were in the range of 36.00 ~ 35.74%, 1.4348 ~ 1.4360 and 91.4 ~ 92.0%, respectively. Also, the transmissibility of UV-A and UV-B decreased slightly from 88.8 to 87.0% and 84.4 to 80.0%, respectively. The tensile strength of sample was in the range of 0.2674 ~0.3190 kgf. Also, the results of these measurements showed that the refractive index increased as the ratio of 2-chloropyridine-4-carboxylic acid increased. The contact angle of ophthalmic lens sample containing 2-chloropyridine-4-carboxylic acid was in the range of 66.38~72.52°. Based on the results of this study, the produced copolymer is suitable for hydrogel soft ophthalmic lenses with high wettability.