Poly(urethane-acrylate) cationomer coatings with increased hydrophobicity and reduced flammability

Abstract

UV-curable poly(urethane-acrylate) cationomer coatings modified with 3(3-(propoxy-2-ol-)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide)-3-propyloxy),1,1,1,3,5,5,5-heptamethyltrisiloxane (HMTS–AGE–DOPA) containing phosphorus and silicon atoms were obtained. The structures of the compounds were characterized by nuclear magnetic resonance (NMR) and Fourier-transform infrared (FT-IR) spectroscopy. The influence of HMTS–AGE–DOPA on the thermal properties and flame retardancy of the materials was investigated. Some surface properties (gloss, contact angle, surface free energy) and performance properties (hardness, abrasion resistance) of the modified coatings were investigated. The introduction of HMTS–AGE–DOPA reduced the glass transition temperature and increased thermal stability. With the addition of the modifier, a significant decrease in the total heat release (THR) was observed. The gloss of the coatings was very high (above 90 GU at all angles), although it slightly decreased with increasing content of the modifier. The introduction of HMTS–AGE–DOPA caused an increase in the hydrophobicity of the coatings due to the presence of siloxane moieties. The coatings are medium-hard materials with a Persoz hardness in the range of 0.38–0.47. The introduction of the modifier resulted in a slight reduction in hardness and an increase in abrasion resistance.