The Synthesis Of Novel Photosensitive Prepolymers And Its Application In Inks

UV curing technology has been developing rapidly for its enabling, energy saving, efficient, economical and environmental friendly etc. In this paper, two novel UV curable prepolymers were synthesized and they were respectively UV curable amino acrylate resin for photoimagineable solder resist inks and organic silicone modified polyurethane acrylate for UV curable plastic inks.In part 1, amino-acrylate resin (β-Hydroxyethyl acrylate modified melamine formaldehyde resin, HEA-MF) was synthesized by the raw materials of melamine, formaldehyde andβ-Hydroxyethyl acrylate, the optimum reaction conditions were investigated in terms of the influence of reaction temperature, reaction time and catalyst. The structure of the products was characterized by FT-IR, the melting point of hexamethylol melamine (HMM) was analyzed by DSC, the etherization degree of the HEA-MF was analyzed by HPLC. The optimum formula ratio was n (melamine) :n (formaldehyde) = 1:8 , and the optimum reaction conditions on hydroxymethyl reaction were follow: the reaction temperature was 70℃; the reaction time was 3.5 h; the optimum reaction conditions on etherization reaction were that the ratio of materials was n (HMM) :n (HEA) = 1:10 , reaction temperature was 105℃and reaction time was 5 h, HEA-MF has good storage stability and low content of free formaldehyde.In part 2, The UV curable HEA-MF as reactive diluent and hardness agent was applied in photoimagineable solder resist inks. The photopolymerization characteristics of this monomer was investigated by Fourier Transform Real Time Infrared spectroscopy ( FT-RTIR) in terms of the influence of the content of photoinitiator; the thermal resistance of the cured film was observed by TGA in terms of the influence of the content and the etherization degree of HEA-MF. the result indicated that HEA-MF has good photopolymerizeable ability and alkaline developable ability, and the cured film showed high hardness, good thermal resistance and excellent film performance, especially it had low volatile smell.In part 3, The UV curable organic silicone modified polyurethane acrylate (Si-M-PUA) was synthesized in acetone by three steps and by the raw materials of isophorone diisocyanate(IPDI), Polyethylene glycol(PEG-400), Trimethylol Propane(TMP),γ -aminopropyl triethoxysilane (SCA-1113), hydroxyl methylacrylate (HEMA) and the catalyst of dibutyltin dilaurate (DBTDL). The optimum reaction conditions were investigated, the optimum reaction conditions were follow: the first reaction temperature was 30-40℃, and the second reaction temperature was 40-45℃, and the third reaction temperature was 60-65℃. The structure of the products was characterized by FT-IR. The UV curable plastic ink was composited of PUA as the basic resin, reactive diluent, photoinitiator and addictives, and was applied onto the different plastic substrate. the optimum formulation were investigated, in terms of the influence of different PUA, reactive diluent and photoiniator. The result was indicated that the adhesion properties of UV curable plastic ink can be improved by the Si-M-PUA resin, and the film has good performance.