Patent EA-003177-B1 (EA)
Title: Fire retardant intumescent coating for lignocellulosic materials
Inventor: LIU FEIPENG
IPC: C09D5/18
Filed: 1999-06-10
Abstract: 1. A fire retardant coating composition for lignocellulosic materials comprising expandable graphite particles, a poymeric binder, a wetting agent and a carbonific material wherein further comprises a solid absorbent material for absorbing toxic gases emitted from said expandable graphite particles in the event that such particles are subjected to heat, a blowing agent, an absorbent promoter; wherein said expandable graphite particles are treated with an intercalant material comprising from about 20 to about 95% by weight of the combined amount of said expandable graphite particles and said solid absorbent material, said polymeric binder comprising from about 5 to about 50% by weight of the combined amount of said polymeric binder, said expandable graphite particles, and said solid absorbent material, said blowing agent comprising from about 0 to about 40% by weight of the combined amount of said blowing agent and said polymeric binder, said carbonific material comprises from about 0 to about 40% by weight of the combined amount of said carbonific material and said polymeric binder and said absorbent promoter comprising from about 0 to about 60% by weight of said combined amount of said absorbent material and said absorbent promoter. 2. The composition of claim 1 wherein said solid absorbent material is selected from the group consisting of limestone, calcium carbonate, sodium hydrogen carbonate and sodium carbonate. 3. The composition of claim 2 wherein said carbonific material is selected from the group consisting of dipentaerythritol, pentaerythritol, pentaerythritol polyurethane, phenol, triethylene glycol, resorcinol, inositol, sorbitol, dextrin, and starch. 4. The composition of claim 3 wherein said blowing agent is selected from the group consisting of urea, butyl urea, dicyandiamide, benzene sulfonyl-hydrazide, melamine, chloroparaffin, guanidine, and glycine. 5. The composition of claim 1 wherein said polymeric binder is selected from the group consisting of phenol formaldehyde resin, urea formaldehyde, melamine reinforced urea formaldehyde resin, polyacrylic latex resin, isocyanate reinforced urea formaldehyde resin, melamine formaldehyde resin, resorcinol formaldehyde resin, isocyanate resin, and mixtures and co-polymerizations thereof. 6. The composition of claim 1 wherein a intercalant material is selected from the group consisting of intercalation compounds of SOx, NOx and a halogen. 7. The composition of claim 1 wherein said absorbent promoter is selected from the group consisting of calcium hydroxide, aluminum trihydrate, magnesium hydroxide, and zinc hydroxide. 8. The composition of claim 1 wherein said wetting agent includes a surfactant in the amount of 0.1% by weight of the total amount of said wetting agent. 9. A fire retardant coating for lignocellulosic materials comprising a first layer and a second layer, said first layer is made of fire retardant composition of claim 1 and including expandable graphite particles, a poymeric binder, a wetting agent a carbonific material and a solvent material wherein further comprises a solid absorbent material for absorbing toxic gases emitted from said expandable graphite particles in the event that such particles are subjected to heat, a blowing agent, an absorbent promoter; wherein said expandable graphite particles are treated with an intercalant material comprising from about 20 to about 95% by weight of the combined amount of said expandable graphite particles and said solid absorbent material, said polymeric binder comprising from about 5 to about 50% by weight of the combined amount of said polymeric binder, said expandable graphite particles, and said solid absorbent material, said blowing agent comprising from about 0 to about 40% by weight of the combined amount of said blowing agent and said polymeric binder, said carbonific material comprises from about 0 to about 40% by weight of the combined amount of said carbonific material and said polymeric binder and said absorbent promoter comprising from about 0 to about 60% by weight of said combined amount of said absorbent material and said absorbent promoter; said second layer comprises a pigment, a resin and a wetting agent. 10. The composition of claim 9 wherein said pigment comprises at least one material selected from the group consisting of mica, titanium dioxide, silicon dioxide, oxalates, zinc borax, perlite, and clay. 11. The composition of claim 9 wherein said solid absorbent material is selected from the group consisting of limestone, calcium carbonate, sodium hydrogen carbonate and sodium carbonate. 12. The composition of claim 9 wherein said carbonific material is selected from the group consisting of dipentaerythritol, pentaerythritol, pentaerythritol polyurethane, phenol, triethylene glycol, resorcinol, inositol, sorbitol, dextrin, and starch. 13. The composition of claim 9 wherein said polymeric binder is selected from the group consisting of phenol formaldehyde resin, urea formaldehyde, melamine reinforced urea formaldehyde resin, polyacrylic latex resin, isocyanate reinforced urea formaldehyde resin, and mixtures and co-polymerizations thereof.