Claims
- 1. A method of treating wood by penetration of a treating solution, said method comprising the steps of:
- (a) placing the wood to be treated in an evacuation zone and exposing the wood to pressures below atmospheric pressure for a time sufficient to remove moisture and other volatiles from the wood;
- (b) immersing the wood in a water-based treating solution comprising a phenolic resin prepolymer, a resorcinol formaldehyde resin prepolymer, and water;
- (c) maintaining the wood immersed in the treating solution under pressures below atmospheric pressure until the solution has penetrated into the wood;
- (d) increasing the pressure above the solution to a pressure above atmospheric to thereby increase the penetration of the wood by said treating solution; and
- (e) recovering treated wood.
- 2. The method of claim 1 wherein said phenolic resin prepolymer is phenol formaldehyde resin prepolymer.
- 3. The method of claim 1 in which the treated wood is heated to accelerate curing of said treating solution.
- 4. The method of claim 1 wherein said treating solution is further comprised of:
- (a) 8% to 30% by weight of said phenolic resin prepolymer;
- (b) 0.8% to 7% by weight of said resorcinol formaldehyde resin prepolymer; and
- (c) 64% to 91% by weight of water.
- 5. The method of claim 1 wherein said phenolic resin prepolymer is present in a ratio of 16% to 20% by weight.
- 6. The method of claim 1, wherein said treating solution is a water dilutable concentrate further comprising:
- (a) 40% to 60% by weight of said phenolic resin prepolymer;
- (b) 4% to 12% by weight of said resorcinol formaldehyde resin prepolymer; and
- (c) 28% to 56% water.
- 7. The method of claim 1, wherein said treating solution further comprises an organo-metallic wood preserving compound.
- 8. The method of claim 7 wherein said organo-metallic wood preserving compound is selected from the group consisting of copper gluconate and copper triethanolamine.
- 9. The method of claim 1 wherein said treating solution further comprises a diammonium-based fire retardant compound.
- 10. The method of claim 9 wherein said diammonium-based fire retardant compound is diammonium phosphate.
- 11. Treated wood produced by the process of claim 1.
- 12. Treated wood produced by the process of claim 3.
- 13. Treated wood produced by the process of claim 8.
- 14. Treated wood produced by the process of claim 10.
Parent Case Info
This is a divisional of application(s) Ser. No. 08/113,651 filed on Aug. 31, 1993 now U.S. Pat. No. 5,461,108.
US Referenced Citations (26)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1184328 |
Mar 1985 |
CAX |
Divisions (1)
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Number |
Date |
Country |
Parent |
113651 |
Aug 1993 |
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