광섬유 1차 Coating용 UV 경화수지의 제조 및 물성

Preparation and Properties of UV- Curable Primary Coating Material for Optical Fiber

Several urethane acrylate prepolymers were prepared from two different isocyanate, 4,4'-dicyclohexylmethane diisocyanate( HMDI) or isophrone diisocyanate(IPDI) , and two different polyol, polybutadienediol(PBD) and/or polypropylene oxide biol(PPG), and 2- hydroxyethyl acrylate(HEA) with dibutyl tin dilaurate as a catalyst. Formulation of the UV-curable buffer coating was made with prepolymer, photoinitiator, and one of four different diluent such as 1-vinyl -2-pyrrolidone(VP), lauryl methacrylate(LMA), acrylic acid -2-ethyl hexyl ester(AEHE) and acrylic acid n - butyl ester(ABE). The effect of the chemical structure of diluent and prepolymer, and overall composition of the prepolymer/diluent on the properties of IV-curable urethane acrylate for primary optical fiber coating were investigated. The properties of the polyurethane acrylate coating material such as modulils, refractive index, and viscosity were dependent on the type and content of prepolymer and diluent, and overall composition of the formulation. It was found that AEHE is desirable diluent for primary fiber coating material. The desirable composition of PBD, when mixed PBD/PPG dials are used, is about 50wt%. Most of the urethane acrylate prepolymers prepared in this study could be used for primary optical fiber coating material and exhibited good properties, i.e., low glass transition temperature, low modulus even at low temperature, say, below -40℃, high refractive index and low viscosity.