Synthesis and Characterization of a One-Component Water-Soluble Photoinitiator Based on Thioxanthone Derivatives
Thioxanthone derivatives with additional amino groups (TX-S-NH 3 ) are synthesized via a simple esterification reaction between TX-S-CH 2 -COOH and 2-methylaminoethanol hydrocarbons in a p-toluene sulfonic acid medium. The TX-S-NH 3 is characterized by 1 H NMR, 13 C NMR, FT-IR, HRMS, ultraviolet-visible spectrophotometry, and fluorescence spectroscopy. TX-S-NH 3 has strong absorption in water and ethanol, and the molar extinction coefficients at 395 nm are 2800 and 2780 mol −1 L cm −1 , respectively. TX-S-NH 3 shows a low fluorescence quantum yield of 0.109 in deionized water. The maximum mobility of TX-S-NH 3 in the photocuring product in ethanol is 12.5%. The double bond conversion of TMPTA cured by TX-S-NH 3 is 60.7% without co-initiator. TX-S-NH 3 has excellent curing effects in UV-curable ink with a light curing time of only 2.3 s.
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