Fire resistant coatings for wood veneer panels
Methods for treating panels are described that include coating a wood substrate with a polymeric solution, curing the coated wood substrate by subjecting the coated wood to ultraviolet radiation and causing the polymeric solution to crosslink to produce a fire-resistant veneer. Also described is a composite material comprising a wood substrate layer, and a UV-cured flame retardant coating the wood substrate layer, wherein the composite material has a Flame Spread Index values within 0 to 25 and a Smoke Developed Index of 450 or lower.
1. A method for treating panels comprising:
coating a wood substrate with a polymeric solution comprising urethane acrylate; and
curing the coated wood substrate by subjecting the coated wood to a source of ultraviolet radiation and causing the polymeric solution to crosslink to produce a fire-resistant veneer, the ultraviolet radiation comprising a UV C dose between about 0.15 and about 0.6 J/cm 2 , a UV V dose between about 0.75 and about 3.5 J/cm 2 , a UV C irradiance between about 0.15 and about 0.24 W/cm 2 and a UV V irradiance between about 0.7 and about 1.3 W/cm 2 .
2. The method of claim 1 , wherein the coating is applied by rolling.
3. The method of claim 1 , comprising adhering the wood substrate to a metallic backing.
4. The method of claim 1 , wherein the cured panel has flammability resistance with a Flame Spread Index value within 0 to 25 and a Smoke Developed Index of 450 or lower.
5. The method of claim 1 , further comprising applying a second coating and curing the second coating by applying ultraviolet radiation to the second coating.
6. The method of claim 5 , wherein the second coating is urethane acrylate.
7. The method of claim 1 , wherein the ultraviolet radiation has a wavelength of about 365 nm.
8. A composite material comprising:
a wood substrate layer; and
an ultraviolet radiation-cured flame retardant coating the wood substrate layer, wherein the composite material has a Flame Spread Index values within 0 to 25 and a Smoke Developed Index of 450 or lower, and wherein the coating has a minimum solids content of about 98%, a viscosity of between about 850 and about 1350 centipoise and a Shore A Hardness of about 70.
9. The composite material of claim 8 , further comprising a base layer and an adhesive between the base layer and the wood substrate.
10. The composite material of claim 9 , wherein the base layer comprises a metal.
11. The composite material of claim 9 , wherein the adhesive meets Class A flammability standard.
12. The composite material of claim 8 , wherein the coating comprises urethane acrylate.
13. The composite material of claim 8 , wherein the coating has a thickness of less than 385 microns.
14. The composite material of claim 13 , wherein the coating has a thickness of approximately 375 microns.
15. The composite material of claim 8 , wherein the wood substrate layer comprises one or more of oak, pine, and maple.
16. The method of claim 1 , comprising moving the coated wood past the source of ultraviolet radiation at a speed of up to 30 meters per minute.
17. The composite material of claim 8 , wherein the coating has a density between approximately 1.02 to 1.08 g/ml and a viscosity of approximately 1100 centipoise.