Copolymerized aramid dope-dyed yarn and method for preparing same

Abstract

The present invention relates to a copolymerized aramid dope-dyed yarn and a method for preparing the same wherein, when a copolymerized aramid yarn is prepared by adding terephthaloyl dichloride to an organic solvent in which an aromatic diamine having a cyano group is dissolved, reacting the same to polymerize a polymerization solution containing a copolymerized aramid polymer, and then spinning and coagulating the polymerization solution, a copolymerized aramid dope-dyed yarn is manufactured by adding a coloring matter having a cation during the polymerization process of the polymerization solution containing the copolymerized aramid polymer. The present invention can effectively prevent deterioration in a polymerization degree of the copolymerized aramid polymer or deterioration in the dissolubility of the polymerization solution due to the addition of the coloring matter to the polymerization solution. Further, according to the present invention, when a copolymerized aramid polymer having a cyano (-CN) group and a coloring matter having a cation are bonded through a hydrogen bond to form a liquid crystal during the polymerization process of the polymerization solution containing the copolymerized aramid polymer, the behavior together with a main chain of the copolymerized aramid polymer is possible, thereby enhancing the color strength, color fastness to light, and color fastness to washing of the copolymerized aramid dope-dyed yarn.

1 . A copolymerized aramid dope-dyed yarn, manufactured by adding terephthaloyl dichloride to an organic solvent in which an aromatic diamine having a cyano group is dissolved, reacting the same to polymerize a polymerization solution containing a copolymerized aramid polymer, then, spinning and coagulating the polymerization solution,
 wherein the yarn includes a coloring matter having a cation, so as to have a color strength of 50 or more.   
     
     
         2 . The yarn according to  claim 1 , wherein the coloring matter having a cation is included in an amount of 0.1 to 5 by weight ('wt. %') to a weight of the copolymerized aramid polymer. 
     
     
         3 . The yarn according to  claim 1 , wherein the yarn has a color fastness to light of grade 4 to grade 5. 
     
     
         4 . The yarn according to  claim 1 , wherein the yarn has a color fastness to washing of grade 4 to grade 5. 
     
     
         5 . The yarn according to  claim 1 , wherein the coloring matter having a cation is at least one selected from: C.I. Basic Black 2, C.I. Basic Blue 22, C.I. Basic Blue 64, C.I. Basic Red 22, C.I. Basic Black 7, C.I. Basic Blue 10, C.I. Basic Blue 12, C.I. Basic Blue 74, C.I. Basic Blue 24, C.I. Basic Blue 25, C.I. Basic Blue 47, C.I. Basic Red 32, C.I. Basic Red 111 and C.I. Basic Blue 140. 
     
     
         6 . The yarn according to  claim 1 , wherein the coloring matter having a cation is a pigment having a cation, a dye having a cation, and a mixture of the pigment having a cation and the dye having a cation. 
     
     
         7 . A method for preparing a copolymerized aramid yarn, comprising: adding terephthaloyl dichloride to an organic solvent in which an aromatic diamine having a cyano group is dissolved; reacting the same to polymerize a polymerization solution containing a copolymerized aramid polymer; then, spinning and coagulating the polymerization solution,
 wherein a coloring matter having a cation is added during a polymerization process of the polymerization solution containing the copolymerized aramid polymer.   
     
     
         8 . The method according to  claim 7 , wherein the coloring matter having a cation is added in an amount of 0.1 to 5 wt. % to a weight of the copolymerized aramid polymer. 
     
     
         9 . The method according to  claim 7 , wherein the coloring matter having a cation is at least one selected from C.I. Basic Black 2, C.I. Basic Blue 22, C.I. Basic Blue 64, C.I. Basic Red 22, C.I. Basic Black 7, C.I. Basic Blue 10, C.I. Basic Blue 12, C.I. Basic Blue 74, C.I. Basic Blue 24, C.I. Basic Blue 25, C.I. Basic Blue 47, C.I. Basic Red 32, C.I. Basic Red 111 and C.I. Basic Blue 140. 
     
     
         10 . The method according to  claim 7 , wherein the coloring matter having a cation is a pigment having a cation, a dye having a cation, and a mixture of the pigment having a cation and the dye having a cation. 
     
     
         11 . The method according to  claim 7 , wherein the aromatic diamine having a cyano group, dissolved in the organic solvent, is prepared by dissolving para-phenylenediamine and cyano-para-phenylenediamine in a molar ratio of 1:9 to 9:1 in the organic solvent. 
     
     
         12 . The method according to  claim 7 , wherein the aromatic diamine having a cyano group, dissolved in the organic solvent, is prepared by dissolving cyano-para-phenylenediamine alone in the organic solvent. 
     
     
         13 . The method according to  claim 7 , wherein terephthaloyl dichloride is added in the same molar amount as that of the aromatic diamine having a cyano group to the organic solvent in which the aromatic diamine having a cyano group is dissolved.