Abstract
Difunctional boron-containing reactive flame retardant for UV-curable epoxy acrylate oligomer was synthesized from phenyl boronic acid and glycidyl methacrylate. The synthesized reactive diluent was utilized to formulate ultraviolet (UV)-curable wood coatings. The weight fractions of reactive diluent in coatings formulation was varied from 5 to 25 wt % with constant photoinitiator concentration. The molecular structure of reactive flame retardant was confirmed by Fourier-transform infrared, Nuclear magnetic resonance (NMR) and 11B NMR spectral analysis. Further, the efficacy of flame retardant behaviour of coatings was evaluated using limiting oxygen index and UL-94 vertical burning test. Thermal stability of cured coatings films were estimated from thermogravimetric and differential scanning calorimetry analysis. The effects of varying concentration of reactive diluent on the viscosity of coatings formulation along with optical, mechanical and chemical resistance properties of coatings were also evaluated. The coatings gel content, water absorption behaviour, contact angle analysis and stain resistance were also studied.
Highlights
With the increasing awareness regarding the health, fire safety and environmental regulations, demands for reduction of the fire hazard posed by highly combustible materials such as wood, plastics, textiles, etc., have gained significant importance in recent past
Difunctional boron-containing reactive flame retardant for UV-curable epoxy acrylate oligomer was synthesized from phenyl boronic acid and glycidyl methacrylate.The synthesized reactive diluent was utilized to formulate ultraviolet (UV)-curable wood coatings
The iodine value of synthesized boron acrylate reactive diluent (BARD) was estimated by Wijs method and found be 115.8 (g of I2/100 g of resin)
Summary
With the increasing awareness regarding the health, fire safety and environmental regulations, demands for reduction of the fire hazard posed by highly combustible materials such as wood, plastics, textiles, etc., have gained significant importance in recent past. Most of these UV-curable resins have many superior properties like, excellent moisture, solvent and chemical resistance, toughness, superior mechanical properties and have good adhesion to many substrates They can catch fire in the presence of ignition source due to their carbonaceous backbone which involves the health risk and lose their mechanical strength, limits their applications where flame retardant performance is required.[17,18] considering the environmental hazards associated with use of halogenated flame retardants, recent research has focused on development of halogen free environmentally friendly flame retardant. The effects of varying concentrations of boron acrylate reactive diluent (BARD) on thermal stability, flame retardancy, oligomer viscosity and coatings properties have been studied
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