Flame retardant composite fiber and preparation method therefor

Abstract

Provided is a method for preparing a flame-retardant composite fabric, the method sequentially including: a solution preparation step of mixing water with glycerol while heating them at a temperature of 60 to 80° C., thereby preparing a glycerol solution; a composite preparation step of adding powdery corn starch to the glycerol solution to obtain a glycerol/corn starch mixture, continuously stirring the glycerol/corn starch mixture, allowing the stirred glycerol/corn starch mixture to stand for a predetermined time, and then grinding the glycerol/corn starch mixture, thereby preparing a powdery thermoplastic starch composite; a powder application step of applying the powdery thermoplastic starch composite to a surface of a sheet-like flax fabric; and a hot-press molding step of subjecting the flax fabric with the thermoplastic starch composite applied thereto to compression molding using a hot press, thereby preparing a flame-retardant composite fabric; and also provides a flame-retardant composite fabric prepared thereby.

1 . A flame-retardant composite fabric prepared by applying to a surface of a flax fabric a mixture of a powdery flame retardant and a thermoplastic starch composite comprising corn starch as a main component and then subjecting the flax fabric to compression molding using a hot press. 
     
     
         2 . The flame-retardant composite fabric of  claim 1 , wherein the thermoplastic starch composite is prepared by mixing water with glycerol to prepare a glycerol solution, adding and mixing corn starch with the glycerol solution to obtain a glycerol/corn starch mixture, allowing the glycerol/corn starch mixture to stand for a predetermined time, and then grinding the glycerol/corn starch mixture. 
     
     
         3 . The flame-retardant composite fabric of  claim 1 , wherein the flame retardant is a mixture of chitosan and ammonium polyphosphate. 
     
     
         4 . A method for preparing a flame-retardant composite fabric, the method sequentially comprising:
 a solution preparation step of mixing water with glycerol while heating them at a temperature of 60 to 80° C., thereby preparing a glycerol solution;   a composite preparation step of adding powdery corn starch to the glycerol solution to obtain a glycerol/corn starch mixture, continuously stirring the glycerol/corn starch mixture, allowing the stirred glycerol/corn starch mixture to stand for a predetermined time, and then grinding the glycerol/corn starch mixture, thereby preparing a powdery thermoplastic starch composite;   a powder application step of applying the powdery thermoplastic starch composite to a surface of a sheet-like flax fabric; and   a hot-press molding step of subjecting the flax fabric with the thermoplastic starch composite applied thereto to compression molding using a hot press, thereby preparing a flame-retardant composite fabric.   
     
     
         5 . The method of  claim 4 , further comprising, after the composite preparation step, a flame retardant addition step of adding a powdery flame retardant, prepared by mixing chitosan and ammonium polyphosphate together, to the powdery thermoplastic starch composite, prepared in the composite preparation step, to make a powdery thermoplastic starch composite/flame retardant mixture;
 wherein the power application step comprises applying the powdery thermoplastic starch composite/flame retardant mixture to the surface of the flax fabric.   
     
     
         6 . The method of  claim 5 , wherein the flame retardant is added in an amount of 3 to 9 parts by weight based on the total weight of the flame-retardant composite fabric. 
     
     
         7 . The method of  claim 4 , wherein the hot-press molding step is performed by stacking sheets of the flax fabric with the thermoplastic starch composite applied thereto on a compression mold and then pressing the sheets at a pressure of 7 MPa or higher and a temperature of 120 to 160° C.