Method for the treatment of textiles after washing

Abstract

The invention provides a method for the treatment of textile after washing, using chitosan to reduce the surfactant activities of the residual anionic surfactant on textile after washing and to neutralize the residual base on textile after washing. The chitosan is represented by the formula (I):

What is claimed is:  
     
         1 . A method for the treatment of textiles after washing, which uses chitosan to reduce surfactant activities of residual anionic surfactant on textile after washing and to neutralize residual base on the textile.  
     
     
         2 . The method of  claim 1 , wherein the chitosan is dissolved in an acidic liquor to form chitosan liquor, the chitosan liquor contains about 0.00001%˜10% by weight of chitosan, and the chitosan is represented by the formula (I).  
       
         
           
           
               
               
           
         
       
     
     
         3 . The method of  claim 1 , wherein the chitosan is prepared by dissolving the chitosan acid salts in water to form a chitosan liquor, the chitosan liquor contains about 0.00001%˜10% by weight of chitosan, and the chitosan acid salts are represented by the formula (II):  
       
         
           
           
               
               
           
         
       
       wherein R is selected from at least one of the group consisting of C n-1 H 2n-1 COOH(where n=1˜3), lactic acid, malic acid, citric acid, ascorbic acid, oxalic acid, succinic acid, malonic acid, adipic acid, pyruvic acid, glutaric acid, tartaric acid, asparagic acid, epoxysuccinic acid, monochoroacetic acid, salicylic acid, itaconic acid, pyrrolidone carboxylic acid, glycolic acid, nitric acid, sulfuric acid, hydrochloric acid, and phosphate acid.  
     
     
         4 . The method of  claim 1 , wherein the textile is immersed into a chitosan liquor formed from the chitosan to reduce the surfactant activities of the anionic surfactant and to neutralize the residual base, the chitosan liquor contains about 0.00001% to 0.2% by weight of chitosan.  
     
     
         5 . The method of  claim 1 , wherein chitosan liquor formed from chitosan is sprayed onto the textile to reduce the surfactant activities of the anionic surfactant and to neutralize the residual base, the chitosan liquor contains about 0.01% to 5% by weight of the chitosan.  
     
     
         6 . The method of  claim 1 , which further comprises of: 
 using the chitosan and a cationic surfactant, together, to keep the softening effect of the cationic surfactant on the textile after washing while reducing the amount of the cationic surfactant used.    
     
     
         7 . The method of  claim 6 , wherein the cationic surfactant is selected from at least one of the group consisting of ammonium salts, quaternary ammonium salts, alkyl pyridium salts, and imidazolines, and the concentration of the cationic surfactant is 0.001% owf to 10% owf (owf, on weight of fabric) for the softening treatment of the textile after washing.  
     
     
         8 . The method of  claim 6 , which is treating the textile after washing by chitosan first, followed by the cationic surfactant.  
     
     
         9 . The method of  claim 6 , which is treating the textile after washing by chitosan and the cationic surfactant at the same time.