Reactive oil/copper preservative systems for wood products

Abstract

The specification describes preserved solid wood or wood composites including a copper ammonium acetate complex wood preservative and a drying oil. The wood preservative is present in the wood in an amount effective to improve the resistance of the treated wood to at least one type of decomposition, such as decay or insect attack. The drying oil is present in the wood in an effective amount to accomplish at least one useful end, such as reducing the water absorption or thickness swell of the treated wood or increasing its mechanical strength, even in a wood composite made using less binding resin than usual. Yet another aspect of the invention is a method of making the treated wood from green wood in solid or flaked form. A copper ammonium acetate complex wood preservative and optionally a drying oil are added to the green wood.

1 . A treated wood product comprising: 
 a. a predominant proportion of wood in the form of plural plies or particles joined together;    b. a copper compound based wood preservative, present in said wood in an amount effective to improve the resistance of the treated wood product to decay; and    c. a drying oil, present in said wood in an amount effective to reduce the water absorption of the treated wood product.    
     
     
         2 . The treated wood product of  claim 1 , wherein said copper compound based wood preservative comprises: 
 alkaline (amine or ammonia) copper quat (ACQ)    ammonium/copper complex    ammoniacal copper zinc arsenate (ACZA)    bis(N-cyclohexyldiazeniumdioxy)copper    copper acetate    copper ammonium acetate complex    copper azole    copper borate    copper carbonate    copper citrate,    copper fluoride    copper fluoroborate    copper hydroxide    copper hydroxycarbonate    copper naphthenate    copper oxide    copper oxychloride    copper salt of 8-Hydroxyquinoline    copper sulfate    diethanolamine/copper complex    diethylamine/copper complex    ethanolamine/copper complex    ethylene diamine/copper complex    triethanolamine/copper complex    or a combination thereof.    
     
     
         3 . The treated wood product of  claim 1 , wherein said copper compound based wood preservative comprises a copper ammonium acetate complex.  
     
     
         4 . The treated wood product of  claim 1 , comprising from about 0.5 wt. % to about 15 wt. % of said copper compound based wood preservative, on a dry wood basis.  
     
     
         5 . The treated wood product of  claim 1 , comprising from about 0.5 wt. % to about 50 wt. % of said drying oil, on a dry wood basis.  
     
     
         6 . The treated wood product of  claim 1 , in the form of treated wood particles joined to form a composite wood product.  
     
     
         7 . The treated wood product of  claim 6 , further comprising an amount of a resin bonding agent effective to improve the bond strength of the composite wood product.  
     
     
         8 . The treated wood product of  claim 1 , in the form of treated wood plies joined to form plywood.  
     
     
         9 . The treated wood product of  claim 8 , further comprising an amount of a resin bonding agent to improved the bond strength of the plywood.  
     
     
         10 . A treated wood composite consisting essentially of: 
 a. wood particles joined together;    b. a copper compound based wood preservative, present in said wood composite in an amount effective to improve the resistance of the treated wood to decay; and    c. a drying oil, present in said wood composite in an amount effective to reduce the thickness swell of the treated wood.    
     
     
         11 . A treated wood composite consisting essentially of: 
 a. wood particles joined together;    b. a copper compound based wood preservative, present in said wood composite in an amount effective to improve the resistance of the treated wood to decay; and    c. a drying oil, present in said wood composite in an amount effective to improve the bond strength of the treated wood.    
     
     
         12 . A method of making treated wood particles comprising: 
 a. providing wood particles; and    b. treating said wood particles with a copper based wood preservative comprising a copper compound and a drying oil in an aqueous emulsion.    
     
     
         13 . The method of  claim 12 , further comprising the step of drying said treated wood particles.  
     
     
         14 . The method of  claim 12 , further comprising the step of pressing said treated wood particles to form a composite wood product.  
     
     
         15 . The method of  claim 12 , further comprising the step of adding a binding resin to said wood particles.  
     
     
         16 . An emulsion comprising: 
 a. a copper compound based wood preservative;    c. a drying oil; and    c. a predominant amount of water.    
     
     
         17 . The emulsion of  claim 16 , wherein said copper compound based wood preservative comprises: 
 alkaline (amine or ammonia) copper quat (ACQ)    ammonium/copper complex    ammoniacal copper zinc arsenate (ACZA)    bis(N-cyclohexyldiazeniumdioxy)copper    copper acetate    copper ammonium acetate complex    copper azole    copper borate    copper carbonate    copper citrate,    copper fluoride    copper fluoroborate    copper hydroxide    copper hydroxycarbonate    copper naphthenate    copper oxide    copper oxychloride    copper salt of 8-Hydroxyquinoline    copper sulfate    diethanolamine/copper complex    diethylamine/copper complex    ethanolamine/copper complex    ethylene diamine/copper complex    triethanolamine/copper complex    or a combination thereof.    
     
     
         18 . The emulsion of  claim 16 , wherein said copper compound based wood preservative comprises a copper ammonium acetate complex.