Wang HL, Liu JH, Xu SP, Shi WF (2009) Preparation and film properties of tri(3,4-epoxycyclohexylmethyl) phosphate based cationically UV curing coatings. Progress in Organic Coatings 65(2), 263-268. [In English]

Web link: http://dx.doi.org/10.1016/j.porgcoat.2008.12.001

Keywords:

Cycloaliphatic epoxide resin; Flame-retardant; UV curing; Phosphate; Thermal degradation; thermal-degradation; flame; monomers; polymers; behavior; systems

Abstract: A facile synthesis of phosphorus-containing trifunctional cycloaliphatic epoxide resin, tri(3,4-epoxycyclohexylmethyl) phosphate (TECP), used for cationically UV Curing coatings as a reactive-type flame retardant, was proposed. The molecular structure was confirmed by FTIR, (1)H NMR and (31)P NMR spectroscopic analysis. A series of name retardant formulations by incorporating into a commercial difunctional cycloaliphatic epoxide resin, CYRACURE (TM) UVR-6110, were prepared, and exposed to a medium pressure lamp to form the Cured films under the presence of diaryliodonium hexafluorophosphate salt as a cationic photoinitiator. Their flame retardancy examined by the limiting oxygen index showed the improvement up to 27 for 50 wt% TECP addition compared with 21 for pure UVR-6110. The T(s) and T(g) decreased from 86 degrees C and 131 degrees C to 55 degrees C and 91 degrees C, respectively, by using dynamic mechanical thermal analysis, whereas the tensile strength showed a slight increase (11%) with 50 wt% TECP addition. The thermogravimetric analysis (TGA) and real-time Fourier transform infrared spectroscopy (RT-FTIR) measurement demonstrated the condensed-phase flame retardant mechanism. (C) 2008 Elsevier B.V. All rights reserved.