Abstract
A UV-cured polyurethane (PU)/nano-silica composite with a flame-retarded coating system was obtained from the composition of nano-silica containing a UV-curable PU oligomer and a UV-reactive phosphonic acid [ethylene glycol methacrylate phosphate (EGMP)]. The UV-curable PU oligomer was prepared by an addition reaction of 2-hydroxyethyl methacrylate (2-HEMA) with an NCO-terminated PU pre-polymer; this was then mixed with a methanol dispersion of nano-silica. The UV-reactive phosphonic acid (EGMP) was prepared by a reaction of 2-HEMA with phosphorus pentoxide (P2O5). The curing reaction of the PU/nano-silica composite coating system was carried out by UV irradiation with the aid of a photoinitiator (2-hydroxy-2-methylpropiophenone). The thermal properties of these PU/nano-silica composite coatings were investigated by the measurements of dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA), respectively. A phosphorus (phosphonic acid) containing ingredient, EGMP in PU coating system that provides good adhesion to steel surface and flame retardation. Their physical properties (contact angle, hardness) and flame flammability [limiting oxygen index (LOI), UL-94 test] with various phosphorus contents (different dosages of EGMP) were also evaluated in this report.
The author (K.-N.C.) is indebted to the National Science Council, Taiwan, Republic of China.
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©2013 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Masthead
- Original articles
- Grafting of maleic anhydride on polypropylene by reactive extrusion: effect of maleic anhydride and peroxide concentrations on reaction yield and products characteristics
- An optical system for measuring the residence time distribution in co-rotating twin-screw extruders
- Effect of processing technology on the morphological, mechanical and electrical properties of conductive polymer composites
- Thermodynamic modeling of polyamide-6 (PA-6)/cellulose acetate (CA) blend membrane prepared via casting technique
- Monte Carlo simulation of ionic conductivity in polyethylene oxide
- Impact fracture toughness and morphology of polypropylene/Mg(OH)2 composites
- High impact toughness of polyamide 6/poly (vinylidene fluoride) blends induced by an ionic liquid
- Application of chemically-cross-linked chitosan for the removal of Reactive Black 5 and Reactive Yellow 84 dyes from aqueous solutions
- Flame retardation behaviors of UV-curable phosphorus-containing PU coating system
- Preparation and characterization of modified chitosan for in vitro controlled release of vitamin B12
- Surface modification of nano-alumina and its application in preparing polyacrylate water-based wood coating