Suede type artificial leather with antifouling property and preparation method therefor

Abstract

A suede type artificial leather having an antifouling property is provided. A polymeric elastomer is impregnated in a nonwoven fabric formed by three-dimensionally interlacing ultrafine fibers and raising is formed, wherein the polymeric elastomer is a fluorine-containing modified polyurethane, and the fluorine-containing modified polyurethane is obtained by a polymerization of a urethane prepolymer having isocyanate groups at terminals, obtained by reacting a diol and a diisocyanate, and a fluorinated carbon compound having hydroxy functional groups at both terminals. The fluorine-containing modified polyurethane has a weight average molecular weight of 500,000 to 800,000. The suede type artificial leather is prepared by using the fluorine-containing polyurethane elastomer.

1 . A suede type artificial leather having antifouling property in which a polymeric elastomer is impregnated in a nonwoven fabric formed by three-dimensionally interlacing ultrafine fibers and raising is formed,
 wherein the polymeric elastomer is a fluorine-containing modified polyurethane, and   the fluorine-containing modified polyurethane is a product obtained by a polymerization reaction between a urethane prepolymer having isocyanate groups at terminals, obtained by reacting a diol and a diisocyanate, and a fluorinated carbon compound having hydroxy functional groups at both terminals, and has a weight average molecular weight (Mw) of 500,000 to 800,000.   
     
     
         2 . The suede type artificial leather having antifouling property according to  claim 1 , wherein the urethane prepolymer has a weight average molecular weight (Mw) of 400,000 to 700,000. 
     
     
         3 . The suede type artificial leather having antifouling property according to  claim 1 , wherein the fluorinated carbon compound having hydroxy functional groups at both terminals, has 8 to 14 fluorine groups bonded to one side chain and fluorine content of 50 to 70 mol % in one functional group and is an ether diol having hydroxy functional groups at both terminals. 
     
     
         4 . A method of preparing a suede type artificial leather having antifouling property in which a polymeric elastomer is impregnated in a nonwoven fabric formed by three-dimensionally interlacing ultrafine fibers and raising is formed,
 wherein the polymeric elastomer is a fluorine-containing modified polyurethane, and the fluorine-containing modified polyurethane is prepared by a method comprising:   preparing a urethane prepolymer having a weight average molecular weight (Mw) of 400,000 to 700,000 by reacting a diol and a diisocyanate; and   preparing a polymerization product having a weight average molecular weight (Mw) of 500,000 to 800,000 by reacting the prepolymer and a fluorinated carbon compound having hydroxy functional groups at both terminals.   
     
     
         5 . The method of preparing a suede type artificial leather according to  claim 4 , wherein the diol and the diisocyanate is reacted at a molar ratio of 1:1.2 to 1:1.4 to prepare the urethane prepolymer. 
     
     
         6 . The method of preparing a suede type artificial leather according to  claim 4 , wherein the fluorinated carbon compound having hydroxy functional groups at both terminals, has 8 to 14 fluorine groups bonded to one side chain and fluorine content of 50 to 70 mol % in one functional group and is an ether diol having hydroxy functional groups at both terminals.