Method for manufacturing thermally adhesive fiber web and thermally adhesive fiber web produced thereby

Abstract

A thermally adhesive fiber web implemented by including the steps of: (1) preparing respectively a first spinning solution in which a support component and a second spinning solution in which a thermally adhesive component; (2) performing electrospinning such that the first spinning solution is discharged to a portion of the end surface of a discharge port and the second spinning solution is discharged to the remaining portion, thereby accumulating side-by-side type thermally adhesive composite fibers having a diameter of less than 1 μm; and (3) applying heat to the accumulated side-by-side type thermally adhesive composite fibers. The thermally adhesive fiber web enables easy interfacial bonding to a heterogeneous material with a different material and structural specification and prevents pores formed in an initial stage from being closed during thermal bonding.

1 . A method for manufacturing a thermally adhesive fiber web, comprising:
 (1) preparing respectively a first spinning solution in which a support component, which is a first polymer compound, is dissolved, and a second spinning solution in which a thermally adhesive component, which is a second polymer compound, is dissolved, the second polymer compound having a melting point at least 50° C. lower than that of the first polymer;   (2) after transferring the first spinning solution and the second spinning solution to the end of a discharge port of one spinning nozzle of an electrospinning device through different flow passages, performing electrospinning such that the first spinning solution is discharged to a portion of the end surface of the discharge port and the second spinning solution is discharged to the remaining portion, thereby accumulating side-by-side type thermally adhesive composite fibers having a diameter of less than 1 μm; and   (3) applying heat to the accumulated side-by-side type thermally adhesive composite fibers to prepare a thermally adhesive fiber web.   
     
     
         2 . The method for manufacturing a thermally adhesive fiber web of  claim 1 , wherein the first spinning solution and the second spinning solution contain the same type of solvent. 
     
     
         3 . The method for manufacturing a thermally adhesive fiber web of  claim 1 ,
 wherein the first polymer compound comprises one or more selected from the group consisting of polyvinylidene fluoride (PVDF), polybenzyl imidazole (PBI), and high-melting point polyethersulfone (PES), and   wherein the second polymer compound comprises one or more of low-melting point polyethersulfone and polyvinyl butyral.   
     
     
         4 . The method for manufacturing a thermally adhesive fiber web of  claim 2 , wherein the solvent is at least one solvent of dimethylformamide and dimethylacetamide, or a solvent in which at least one of dimethylformamide and dimethylacetamide is mixed with acetone or alcohol. 
     
     
         5 . The method for manufacturing a thermally adhesive fiber web of  claim 1 , wherein in step (3), heat is applied at a temperature higher than the glass transition temperature of the second polymer compound and lower than the melting point. 
     
     
         6 . A thermally adhesive fiber web, formed by accumulating side-by-side type thermally adhesive composite fibers with a diameter of less than 1 μm wherein a support portion formed of a first polymer compound and a thermally adhesive portion formed of a second polymer compound having a melting point of at least 50° C. lower than that of the first polymer compound are placed adjacent to each other in a cross-section thereof, and having a three-dimensional network structure welded between surfaces of thermally adhesive composite fibers in contact. 
     
     
         7 . The thermally adhesive fiber web of  claim 6 , wherein the area of the thermally adhesive portion within a cross-section of the thermally adhesive composite fiber is 50% or less of the area of the cross-section. 
     
     
         8 . The thermally adhesive fiber web of  claim 6 , wherein the area of the thermally adhesive portion is 10 to 30% of the area of the cross-section. 
     
     
         9 . The thermally adhesive fiber web of  claim 6 , wherein the first polymer compound comprises polyvinylidene fluoride and the second polymer compound comprises polyvinyl butyral. 
     
     
         10 . (canceled) 
     
     
         11 . A waterproof and dustproof sound-transmitting sheet comprising the thermally adhesive fiber web of  claim 6 . 
     
     
         12 . A waterproof and dustproof sound-transmitting sheet comprising the thermally adhesive fiber web of  claim 7 . 
     
     
         13 . A waterproof and dustproof sound-transmitting sheet comprising the thermally adhesive fiber web of  claim 8 . 
     
     
         14 . A waterproof and dustproof sound-transmitting sheet comprising the thermally adhesive fiber web of  claim 9 .