Filament Bundle Type Nano Fiber and Manufacturing Method Thereof

Abstract

A filament type nano-sized long fiber and a method of producing the same are disclosed. In the method, a spinning solution or a spinning melt is electro-spun in drops using a spinneret to which a critical voltage is applied, and the spun drops are continuously collected on a multi-collector. The spinning solution is produced by dissolving a blend or copolymer consisting of two or more kinds of polymers in a solvent. The spinning melt is produced by melting the polymers. The multi-collector is selected from the group consisting of a plate type collector, a roll type collector, and a combination thereof. The filament type nano-sized long fiber is processed into a yarn through one step during the electrospinning process, and thus, mechanical properties are better than those of a conventional nanofiber non-woven fabric. Consequently, the filament type nano-sized long fiber can be utilized for the extended application.

1 . A filament bundle type nano-sized fiber produced through a process comprising electrospinning a spinning solution or a spinning melt in drops using a spinneret to which a critical voltage is applied, and continuously collecting the spun drops on a multi-collector, the spinning solution having been produced by dissolving a blend or copolymer consisting of two or more kinds of polymers in a solvent, the spinning melt being produced by melting the polymers, and the multi-collector is selected from the group consisting of a plate type collector, a roll type collector, and a combination thereof. 
   
   
       2 . The filament bundle type nano-sized fiber as set forth in  claim 1 , wherein each of the polymers is a mixture of two or more selected from the group consisting of polyimide, polyamide, polyethylene, polypropylene, polyester, polyvinylidene fluoride, polyacrylonitrile, polysulfone, and polyethylene oxide. 
   
   
       3 . The filament bundle type nano-sized fiber as set forth in  claim 1 , wherein each of the polymers contains one or more amine groups selected from the group consisting of monoamine, diamine, triamine, and tetramine. 
   
   
       4 . The filament bundle type nano-sized fiber as set forth in  claim 1 , wherein each of the polymers is a polyamide-polyimide copolymer including a compound expressed by Formula 1, in which m is 1-99 mol %, and the other compound expressed by Formula 2, in which n is 1-99 mol %. 
     Formula 1 
     
       
         
         
             
             
         
       
     
   
   
       5 . The filament bundle type nano-sized fiber as set forth in  claim 4 , wherein the polyamide-polyimide copolymer has a number average molecular weight of 200-1,000,000. 
   
   
       6 . The filament bundle type nano-sized fiber as set forth in  claim 1 , wherein the solvent is any one selected from the group consisting of N-methyl-2-pyrrolidone, γ-butyrolactone, 2-butoxyethanol, dimethylacetamide, and dimethylformamide. 
   
   
       7 . The filament bundle type nano-sized fiber as set forth in  claim 1 , wherein a filament type nanofiber is a nano-sized long fiber having a diameter of 1-1,000 nm. 
   
   
       8 . A method of producing a filament bundle type nano-sized fiber, comprising:
 1) preparing a spinning solution, wherein 10-50 wt % of blend or copolymer consisting of two or more kinds of polymers is dissolved in a solvent, or a spinning melt, which is produced by heating the polymers to at least a melting point of the polymers to melt the polymers;   2) electrospinning the spinning solution or the spinning melt in drops using a spinneret to which a critical voltage is applied; and   3) discharging the spun drops onto a first collector to produce nanofibers, and recollecting the nanofibers, which are collected on the first collector, on a second collector to continuously collect the nanofibers, wherein at least one of the first and second collectors rotates.   
   
   
       9 . The method as set forth in  claim 8 , wherein one or more collectors are further used in addition to the first and second collectors. 
   
   
       10 . The method as set forth in  claim 8 , wherein the first collector consists of a metal plate or mesh made of an electrically conductive material, and is fixed. 
   
   
       11 . The method as set forth in  claim 8 , wherein the second collector is selected from the group consisting of a glass tube, plastic tube, rod made of a material capable of generating static electricity, and a tube or rod coated with the material capable of generating static electricity. 
   
   
       12 . The method as set forth in  claim 8 , wherein the second collector is a roll type and rotates at 1-100 rpm. 
   
   
       13 . The method as set forth in  claim 8 , wherein a distance between the spinneret and the first collector is 1-100 cm. 
   
   
       14 . The method as set forth in  claim 8 , wherein a distance between the first and second collectors is 1-100 cm. 
   
   
       15 . The method as set forth in  claim 8 , wherein the first collector consists of a metal plate or mesh made of an electrically conductive material, and rotates at 1-1,000 rpm.