Flame retardant for woody materials and flame-retardant woody material

Abstract

Disclosed is a flame retardant for woody materials comprising an organic phosphorus compound represented by formula (1) and a nitrogen compound represented by formula (2); and also relates to a flame-retardant woody material comprising a woody material fireproofed with the flame retardant for woody materials:wherein in formula (1), R1 and R2 are the same or different, and each represents a hydrogen atom, hydroxy, or the like; n is an integer of 1 to 4; X1 and X2 are the same or different, and each represents a hydrogen atom, hydroxy, or the like; andwherein in formula (2), R3, R4, R5, R6, and R7 are the same or different, and each represents a hydrogen atom, methyl, or the like.

1 . A flame retardant for woody materials comprising:
 an organic phosphorous compound represented by formula (1):   
       
         
           
           
               
               
           
         
         wherein in formula (1), R 1  and R 2  are the same or different, and each represents a hydrogen atom, amino, hydroxy, mercapto, a halogen atom, or substituted or unsubstituted C 1-6  alkyl; where the substituted alkyl has one or more substituents selected from the group consisting of amino, hydroxy, mercapto, and a halogen atom; and the substituted or unsubstituted alkyl optionally contains, in its carbon chain, at least one heteroatom selected from the group consisting of an oxygen atom, a nitrogen atom, and a sulfur atom; 
         n is an integer of 1 to 4; and 
         X 1  and X 2  are the same or different, and each represents a hydrogen atom, hydroxy, or C 1-6  alkyl unsubstituted or substituted with hydroxy; and 
         a nitrogen compound or salt thereof, the nitrogen compound being represented by formula (2): 
       
       
         
           
           
               
               
           
         
         wherein in formula (2), R 3  represents a hydrogen atom, methyl ethyl, n-propyl, or isopropyl; 
         R 4 , R 5 , and R 6  are the same or different, and each represents a hydrogen atom, methyl, ethyl, n-propyl, isopropyl, phenyl, o-tolyl, m-tolyl, or p-tolyl; and 
         R 7  represents a hydrogen atom, methyl, ethyl, n-propyl, isopropyl, amino, cyano, nitro, nitroso, —C(═O)—NH 2 , or —C(═NH)—NH 2 , and 
         wherein the nitrogen compound and the organic phosphorous compound are bonded together to form a salt. 
       
     
     
         2 . The flame retardant for woody materials according to  claim 1 , wherein the organic phosphorous compound is a compound of formula (1), in which:
 R 1  is a hydrogen atom or hydroxy,   R 2  is a hydrogen atom or Cis alkyl,   X 1  and X 2  are hydroxy, and   n is 1.   
     
     
         3 . The flame retardant for woody materials according to  claim 1 , wherein the nitrogen compound or salt thereof is a compound of formula (2) or salt thereof, in which R 3 , R 4 , R 5 , and R 6  are hydrogen atoms, and R 7  is a hydrogen atom, amino, cyano, nitro, nitroso, —C(═O)—NH 2 , or —C(═NH)—NH 2 . 
     
     
         4 . The flame retardant for woody materials according to  claim 1 , wherein the nitrogen compound or salt thereof is contained in an amount of 0.7 molar equivalents or more and 1.6 molar equivalents or less relative to the acid value of the organic phosphorous compound. 
     
     
         5 . The flame retardant for woody materials according to  claim 1 , further comprising an inorganic phosphorus compound represented by formula (3): 
       
         
           
           
               
               
           
         
         in which k is an integer of 0 or more and 100 or less. 
       
     
     
         6 . The flame retardant for woody materials according to  claim 5 , wherein the nitrogen compound or salt thereof is contained in an amount 0.95 times or more and 1.4 times or less the sum of 1 molar equivalent relative to the acid value of the organic phosphorous compound and 1 molar equivalent relative to the acid value of the inorganic phosphorus compound. 
     
     
         7 . The flame retardant for woody materials according to  claim 5 , wherein the nitrogen compound or salt thereof is contained in an amount 0.97 times or more and 1.2 times or less the sum of 1 molar equivalent relative to the acid value of the organic phosphorous compound and 1 molar equivalent relative to the acid value of the inorganic phosphorus compound. 
     
     
         8 . The flame retardant for woody materials according to  claim 5 , wherein the inorganic phosphorus compound is a compound of formula (3), wherein k is 0 or 1. 
     
     
         9 . The flame retardant for woody materials according to  claim 5 , wherein the mixing ratio of the organic phosphorous compound and the inorganic phosphorus compound is 1:99 to 75:25 by a mass ratio. 
     
     
         10 . The flame retardant for woody materials according to  claim 1 , further comprising a solvent. 
     
     
         11 . The flame retardant for woody materials according to  claim 10 , wherein the solvent is water. 
     
     
         12 . The flame-retardant for woody materials according to  claim 5 , further comprising a solvent. 
     
     
         13 . The flame-retardant for woody materials according to  claim 12 , wherein the solvent is water.