Treatment method for wooden material

Abstract

A treatment method for a wooden material can significantly suppress changes in color of the wooden material caused by exposure to light or heat. The treatment method includes steps of subjecting a wooden material to the bleaching treatment and to an acetylating treatment.

What is claimed is:  
     
         1 . A treatment method for a wooden material, comprising steps of subjecting the wooden material to a bleaching treatment, and subjecting the wooden material to an acetylating treatment.  
     
     
         2 . A treatment method for a wooden material according to  claim 1 , wherein the acetylating treatment is carried out after the bleaching treatment.  
     
     
         3 . A treatment method for a wooden material according to  claim 2 , wherein the wooden material is washed and is dried between the bleaching treatment and the acetylating treatment.  
     
     
         4 . A treatment method for a wooden material according to  claim 1 , wherein a bleaching solution for the bleaching treatment is selected from a hydrogen peroxide solution, a solution including chlorite, and a solution including hypochlorite, all of which are pH adjusted to 9 to 12.  
     
     
         5 . A treatment method for a wooden material according to  claim 1 , wherein the degree of acetylation of the wooden material subjected to the acetylating treatment is in the range of 1 to 25% by weight gain in the wooden material.  
     
     
         6 . A treatment method for a wooden material according to  claim 3 , wherein the wooden material is washed and is dried until the moisture content in the wooden material is 13% by weight or less, relative to the total weight of the wooden material.  
     
     
         7 . A treatment method for a wooden material according to  claim 1 , wherein the bleaching treatment is carried out by immersing the wooden material into a bleaching solution and the acetylating treatment is carried out until the degree of the acetylation becomes 5% or more by weight gain.  
     
     
         8 . A treatment method for a wooden material, comprising steps of subjecting the wooden material to a bleaching treatment, and subjecting the wooden material to a substituting treatment in which a phenol hydroxyl group included in the wooden material is substituted with another group.  
     
     
         9 . A treatment method for a wooden material according to  claim 8 , wherein the step of subjecting the wooden material to the substituting treatment is an acetylating treatment, an oligoesterification treatment, an etherification treatment, or a formalification treatment.