Wood treatment composition and process
View Patent ↗The present invention comprises a fire resistant wood product and method of manufacture thereof. In one embodiment, the fire resistant wood product comprises a resin and a fire retardant composition, wherein the resin comprises an isocyanate and the fire retardant composition comprises a boron containing compound.
1. A method of manufacturing a fire-retardant, treated oriented strand board, comprising:
applying a fire retardant solution to a wood precursor material, the fire retardant solution consisting of
a boron containing compound,
a metal hydroxide in an amount of 5-50% by weight of the fire retardant solution, and
a surfactant in an amount of about 1% by weight of the fire retardant solution,
to create a treated wood precursor material;
blending the treated wood precursor material with an isocyanate binder resin; and
forming the blended, treated wood precursor material into the oriented strand board, wherein the boron containing compound is present in an amount of 8% to 20% by weight of the treated oriented strand board.
2. The method of claim 1 , wherein the boron-containing compound is disodium octaborate tetrahydrate.
3. The method of claim 1 , wherein the isocyanate binder resin is diphenylmethane diisocyanate.
4. The method of claim 1 , wherein the metal hydroxide is aluminum hydroxide.
5. The method of claim 1 , further comprising forming the fire retardant solution by a process including:
heating at least one of the boron-containing compound or water to a temperature in the range of 60-90° C.; and
mixing the boron-containing compound and the water.
6. The method of claim 1 , wherein the boron-containing compound is present in an amount in the range of 10% to 15% of the weight of the oriented strand board.
7. The method of claim 1 , wherein the surfactant is dimethyl sulfoxide or glycerin.