Synthesis And Photoinitiativity Of Bis-(2,4,6-trimethylbenzoyl) Phenylphosphine Oxide

Bis(2,4,6-trimethylbenzoyl) phenyl phosphine oxide as an effective UV photoinitiator can initiate monomers polymerization. Compared to many traditional photoinitiators, bis-(2,4,6-trimethylbenzoyl)phenylphosphine oxide`s reaction time is very short and its reaction activity is excellent in the initiation process. Its curing speed is fast, it can produce large amounts of free radicals in the UV-curing process, so it has a high efficiency in UV-cured systems, the amount of free radicals is almost zero when the reaction is over.In this thesis, bis(2,4,6-trimethylbenzoyl)phenyl phosphine oxide was prepared by metal Na reduction method and it was characterized by spectroscopy(FT-IR), nuclear magnetic resonance(1H NMR) and mass spectrometry(ESI-MS), it was found that its structure was consistent with the designed structure.Conditions of bis(2,4,6-trimethylbenzoyl)phenyl phosphine oxide’s synthesis process were optimized. Study the molar ratio of phenyl phosphonic dichloride and sodium metal, the reaction time in sodium metal substitution, different proton source, the reaction time and temperature in acylation and the different oxidation catalyst of the reaction. Optimized the reaction conditions.Hyperbranched maleic polyester prepolymer monomers was prepared by pentaerythritol, 2,2-dimethylol propionic acid and maleic anhydride, then it was characterized by spectroscopy(FT-IR), nuclear magnetic resonance(13C NMR), thermal gravimetric(TG) and X- ray diffraction(XRD), the results showed that its structure was consistent with the designed structure. Then test its film properties. Study the influence of concentration of benzophenone, Darocure1173, bis(2,4,6-trimethylbenzoyl) phenyl phosphine oxide to UV-curing time. Compared to benzophenone and α,α-dimethyl-acetophenone-α-hydroxyethy, bis(2,4,6-trimethylbenzoyl) phenyl phosphine oxide has a high efficiency of chemical reactivity. Made a synthesis economic costs accounting.