KR101235078B1 - Method for manufacturing high strength nano-fiber composit - Google Patents

Abstract

PURPOSE: A method for fabricating a high strength composite nanofiber assembly is provided to obtain the composite nanofiber assembly with high mechanical strength and to use the composite nanofiber assembly for health care and skin care. CONSTITUTION: A method for fabricating a high strength composite nanofiber comprises: a step of preparing a composite nanofiber non-woven fabric of a band form by electrospinning using a polymer solution containing a first polymer and a second polymer(S1); and a step of heating the composite nanofiber non-woven fabric while twisting and drawing(S2). [Reference numerals] (AA) Start; (BB) End; (S1) Manufacturing composite nanofiber non-woven fabric assembly(first step); (S2) Manufacturing high intensity composite nanofiber non-woven fabric assembly(second step)

Description

Method for manufacturing high strength composite nanofiber aggregate {Method for manufacturing high strength nano-fiber composit}

The present invention relates to a method for producing a high strength composite nanofiber aggregate.

Conventionally, the composite nanofiber nonwoven fabric manufacturing apparatus for manufacturing the composite nanofiber nonwoven fabric containing two or more types of nanofibers is known (for example, refer patent document 1).

10 is a view for explaining a conventional composite nanofiber nonwoven fabric manufacturing apparatus 900. The conventional composite nanofiber nonwoven fabric manufacturing apparatus 900 is a polymer solution tank for storing a polymer solution of type A in another type (called type A and type B), as shown in Fig. 10 (Fig. 1 of the patent document). 910, a polymer solution tank 920 for storing a type B polymer solution, a plurality of first nozzles 930 for discharging a type A polymer solution, and a plurality of second for discharging a type B polymer solution A high voltage is applied between the nozzle unit 950 including the nozzle 940, the collector 960 that integrates the nanofibers radiated from the nozzle unit 950, and the nozzle unit 950 and the collector 960. A power supply device 970 is provided.

According to the conventional composite nanofiber nonwoven fabric manufacturing apparatus 900, it becomes possible to field-spin two kinds of polymer solutions (type A and type B) at the same time, thereby producing a composite nanofiber nonwoven fabric containing two kinds of nanofibers. It becomes possible. In this case, since the composite nanofiber nonwoven fabric produced by the conventional composite nanofiber nonwoven fabric manufacturing apparatus 900 includes two kinds of nanofibers each having different properties, it is compared with a general nanofiber nonwoven fabric composed of a single nanofiber. It will have a variety of properties.

Japanese Patent Publication No. 2009-510272

However, there is always a demand in the industry for materials having a higher mechanical strength than conventional ones, and the composite nanofiber nonwoven fabric is no exception. In addition, such a requirement is not only present in the composite nanofiber nonwoven fabric, but is a requirement existing in the entire composite nanofiber aggregate including the composite nanofiber filament.

Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing a high-strength composite nanofiber aggregate that can produce a composite nanofiber aggregate having a higher mechanical strength than the conventional one. In addition, it is an object to provide a high-strength composite nanofiber aggregate having a higher mechanical strength than conventional.

[1] A method for producing a high strength composite nanofiber aggregate of the present invention is a method for producing a composite nanofiber aggregate comprising a first polymer having a first melting point and a second polymer having a second melting point lower than the first melting point. And the first nanofibers composed of the first polymer are partially bonded by the second polymer by heating the composite nanofiber aggregate at a temperature lower than the first melting point and higher than the second melting point. A second step of producing a high-strength composite nanofiber aggregate is characterized in that it comprises in this order.

According to the method for producing a high strength composite nanofiber aggregate of the present invention, there is provided a method of manufacturing a composite nanofiber aggregate comprising a first polymer having a first melting point and a second polymer having a second melting point lower than the first melting point. And a second step of producing a high strength composite nanofiber aggregate by heating to a temperature lower than the first melting point and higher than the second melting point while pressing the composite nanofiber aggregate produced by the first process. The high strength composite nanofiber aggregate produced by the second process becomes a high strength composite nanofiber aggregate having a structure in which the first nanofibers made of the first polymer are partially bonded by the second polymer. For this reason, the high strength composite nanofiber aggregate produced by the manufacturing method of the high strength composite nanofiber aggregate of the present invention becomes a composite nanofiber aggregate having a higher mechanical strength than the conventional one.

In addition, the high-strength composite nanofiber aggregate produced by the method of manufacturing the high-strength composite nanofiber aggregate of the present invention is only partially bonded to the first nanofibers, so that the entire high-strength composite nanofiber aggregate is not rigidized, and the composite nanofiber is It can be set as a high-strength composite nanofiber aggregate while maintaining the "flexibility" as an aggregate to some extent.

In addition, in the present invention, the "high strength composite nanofiber aggregate" refers to a composite nanofiber aggregate that is stronger in strength than the composite nanofiber aggregate produced in the first step. The same applies to the "high strength composite nanofiber nonwoven fabric" and "high strength composite nanofiber filament" described later.

[2] In the method for producing a high strength composite nanofiber aggregate of the present invention, in the first step, a composite nanofiber nonwoven fabric is prepared as the composite nanofiber aggregate, and the second step is heated while pressing the composite nanofiber nonwoven fabric. It is preferable to produce a high strength composite nanofiber nonwoven fabric as the high strength composite nanofiber aggregate.

By such a method, it becomes possible to manufacture a composite nanofiber nonwoven fabric having a higher mechanical strength than conventionally.

[3] In the method for producing a high strength composite nanofiber aggregate of the present invention, in the first step, the composite nanofiber nonwoven fabric is subjected to electrospinning using a polymer solution containing the first polymer and the second polymer. It is preferable to prepare.

By such a method, a composite nanofiber nonwoven fabric obtained by mixing a first nanofiber made of a first polymer and a second nanofiber made of a second polymer can be produced.

[4] In the method for producing a high strength composite nanofiber aggregate of the present invention, in the first step, a strip-shaped composite nanofiber nonwoven fabric is prepared as the composite nanofiber aggregate, and in the second step, the strip-shaped composite nanofiber is produced. It is preferable to produce a high strength composite nanofiber filament as the high strength composite nanofiber aggregate by heating the fiber nonwoven fabric while twisting and stretching.

By such a method, it becomes possible to manufacture a composite nanofiber filament having a higher mechanical strength than conventionally.

[5] In the method for producing a high-strength composite nanofiber aggregate of the present invention, in the first step, the composite nanofiber nonwoven fabric is produced by electric field spinning using a polymer solution containing the first polymer and the second polymer. Then, it is preferable to cut the said composite nanofiber nonwoven fabric and to manufacture the said strip | belt-shaped composite nanofiber nonwoven fabric.

By using such a method, either the case where the composite nanofiber nonwoven fabric is used as it is and the case where a band-shaped composite nanofiber nonwoven fabric is used can be responded.

[6] In the method for producing a high-strength composite nanofiber aggregate of the present invention, in the first step, the band-shaped composite is formed by electrospinning in a band shape using a polymer solution containing the first polymer and the second polymer. It is desirable to produce nanofiber nonwovens.

By such a method, it becomes possible to manufacture a strip | belt-shaped composite nanofiber nonwoven fabric efficiently with high productivity. Moreover, since it becomes a strip | belt-shaped composite nanofiber nonwoven fabric from the beginning, the effect that a cutting device for making a strip | belt-shaped composite nanofiber nonwoven fabric becomes unnecessary is also acquired.

[7] In the method for producing a high-strength composite nanofiber aggregate of the present invention, the weight of the first nanofibers contained in the composite nanofiber aggregate is set to "M1", and the composite nanofiber aggregate is used as the second polymer. When the weight of the formed second nanofiber is "M2", it is preferable to satisfy the relationship of "0.01≤M2 / (M1 + M2) ≤0.40".

The reason why it is preferable to satisfy such a relationship is that when M2 / (M1 + M2) is less than 0.01, the bonding of the first nanofibers by the molten second polymer may be insufficient, and M2 / (M1 + M2) is 0.40. It is because there exists a possibility that the property as a composite nanofiber aggregate may fall when exceeding. Speaking from this viewpoint, it is preferable to satisfy the relationship of "0.02≤M2 / (M1 + M2) ≤0.20". In particular, when producing a composite nanofiber mainly composed of the first nanofibers by the first polymer, it is more preferable to satisfy the above relationship.

[8] In the method for producing a high-strength composite nanofiber aggregate of the present invention, when the average diameter of the first nanofibers is "D1" and the average diameter of the second nanofibers made of the second polymer is "D2". , It is preferable to satisfy the relation of "0.01≤D2 / D1≤0.50".

The reason why it is desirable to satisfy such a relationship is that when D2 / D1 is less than 0.01, the bonding of the first nanofibers by the molten second polymer may be insufficient, and when D2 / D1 exceeds 0.50, This is because the characteristics as a nanofiber aggregate may be degraded. Speaking from this viewpoint, it is preferable to satisfy the relationship of "0.02≤D2 / D1≤0.20". In particular, when producing a composite nanofiber mainly composed of the first nanofiber composed of the first polymer, it is more preferable to satisfy the above relationship.

[9] In the method for producing a high-strength composite nanofiber aggregate of the present invention, when the first melting point is "T1" and the second melting point is "T2", the relationship of "T1-T2≥10 ° C" is satisfied. It is desirable to.

It is preferable that there exists a difference of 10 degreeC or more between 1st melting point T1 and 2nd melting point T2. As a reason for satisfying such a relationship, when the difference between the 1st melting point T1 and the 2nd melting point T2 is less than 10 degreeC, the temperature setting which only a 2nd nanofiber melts in the state which remained the 1st nanofiber remains This is because it is difficult to bond the first nanofibers with the molten second polymer.

[10] In the method for producing a high strength composite nanofiber aggregate of the present invention, the first polymer and the second polymer may be polymers of different materials.

This uses, for example, polyurethane as the first polymer and polyvinylidene fluoride as the second polymer. In this case, it is preferable to satisfy various conditions necessary for carrying out the present invention such as the melting point of the first polymer and the melting point of the second polymer.

[11] In the method for producing a high strength composite nanofiber aggregate of the present invention, the first polymer and the second polymer may be the same material and may have different number average molecular weights.

This is because even if the first polymer and the second polymer are the same material, the melting point and the like can be different because the number average molecular weights are different. In the present invention, such a polymer can also be used. Also in this case, it is preferable to satisfy various conditions necessary for carrying out the present invention.

[12] The high strength composite nanofiber aggregate of the present invention is a high strength composite nanofiber made of a composite nanofiber aggregate comprising a first polymer having a first melting point and a second polymer having a second melting point lower than the first melting point. As an aggregate,

The first nanofibers made of the first polymer have a structure partially bonded by the second polymer.

Since the high-strength composite nanofiber aggregate of the present invention is a high-strength composite nanofiber aggregate having high mechanical strength, it is possible to use electronic materials such as industrial materials such as filters, separators of secondary batteries, separators of capacitors, carriers of various catalysts, and various sensor materials. Medical materials such as materials, regenerative medical materials, biomedical materials, medical MEMS materials, biosensor materials, medical products such as wiping cross, high-performance textiles, high-performance textiles, and other cosmetic products such as healthcare and skin care. It becomes available.

The present invention provides a method for producing a high-strength composite nanofiber aggregate that can produce a composite nanofiber aggregate having a higher mechanical strength than conventional, and also provides a high-strength composite nanofiber aggregate having a higher mechanical strength than conventional.

BRIEF DESCRIPTION OF THE DRAWINGS It is a flowchart explaining the manufacturing method of the high strength composite nanofiber aggregate of this invention.
FIG. 2 is a view for explaining each step of the method for producing a composite nanofiber aggregate according to the first embodiment. FIG.
3 is a view for explaining a method for producing a composite nanofiber aggregate according to the first embodiment.
4 is a view for explaining the method for producing a composite nanofiber aggregate according to the first embodiment.
FIG. 5 is a diagram for explaining a method for producing a composite nanofiber aggregate according to the first embodiment. FIG.
FIG. 6 is a view for explaining a method for producing a composite nanofiber aggregate according to the second embodiment. FIG.
FIG. 7 is a view for explaining a method for producing a composite nanofiber aggregate according to the second embodiment. FIG.
8 is a view for explaining a method for producing a composite nanofiber aggregate according to the second embodiment.
FIG. 9 is a view for explaining a method for producing a high strength composite nanofiber aggregate according to a third embodiment. FIG.
10 is a view for explaining a conventional composite nanofiber nonwoven fabric manufacturing apparatus 900.

Hereinafter, the manufacturing method and the high strength composite nanofiber aggregate of the high strength composite nanofiber aggregate of this invention are demonstrated. Before describing an embodiment, the basic process in the manufacturing method of the high strength composite nanofiber aggregate of this invention is demonstrated first.

BRIEF DESCRIPTION OF THE DRAWINGS It is a flowchart explaining each process of the manufacturing method of the high strength composite nanofiber aggregate of this invention. The method for producing a high strength composite nanofiber aggregate of the present invention, as shown in FIG. 1, a composite nanofiber aggregate comprising a first polymer having a first melting point and a second polymer having a second melting point lower than the first melting point. The first nanofibers made of the first polymer are partially formed by the second polymer by heating the composite nanofiber aggregate at a temperature lower than the first melting point and higher than the second melting point. And a second process (step S21) of producing a high-strength composite nanofiber aggregate having a bonded structure.

Moreover, it is preferable that there exists a difference of 10 degreeC or more between 1st melting point T1 and 2nd melting point T2. When the difference between the first melting point T1 and the second melting point T2 is less than 10 ° C, it is difficult to set the temperature at which only the second nanofibers are melted in the state where the first nanofibers remain. This is because bonding the first polymers becomes difficult.

In addition, the composite nanofiber aggregate manufactured by the first process sets the weight of the first nanofibers contained in the composite nanofiber aggregate as "M1" and the weight of the second nanofibers contained in the composite nanofiber aggregate. When it is set to "M2", it is preferable to satisfy the relationship of "0.01≤M2 / (M1 + M2) ≤0.40".

The reason why it is preferable to satisfy such a relationship is that when M2 / (M1 + M2) is less than 0.01, the bonding of the first nanofibers by the second polymer may be insufficient, and M2 / (M1 + M2) It is because the property as a composite nanofiber aggregate may fall when is more than 0.40. Speaking from this viewpoint, it is preferable to satisfy the relationship of "0.02≤M2 / (M1 + M2) ≤0.20". In particular, when producing a composite nanofiber aggregate mainly composed of the first nanofibers of the first polymer, it is more preferable to satisfy the above relationship.

In addition, the composite nanofiber aggregate produced by the first step has a value of "0.01≤D2 / D1 when the average diameter of the first nanofibers is" D1 "and the average diameter of the second nanofibers is" D2 ". It is preferable to satisfy the relationship of?

The reason for satisfying such a relationship is that when D2 / D1 is less than 0.01, the bonding of the first nanofibers by the second polymer may be insufficient, and when D2 / D1 exceeds 0.50, the composite nanofibers This is because the characteristics as an aggregate may be degraded. Speaking from this viewpoint, it is preferable to satisfy the relationship of "0.02≤D2 / D1≤0.20". In particular, when producing a composite nanofiber aggregate mainly composed of the first nanofibers of the first polymer, it is more preferable to satisfy the above relationship.

Each process in the manufacturing method of the high strength composite nanofiber aggregate of this invention demonstrated above is common in each embodiment demonstrated below. In addition, in the manufacturing method of the high strength composite nanofiber aggregate of each embodiment shown below, polyurethane is used as a 1st polymer, and polyvinylidene fluoride is used as a 2nd polymer.

According to the method for producing a high-strength composite nanofiber aggregate of the present invention, electronic materials such as industrial materials such as filters, separators of secondary batteries, separators of capacitors, carriers of various catalysts, various sensor materials, regenerative medical materials, and biomedical materials Medical materials such as materials, medical MEMS materials, biosensor materials, medical products such as wiping crosses, high-performance textiles, high-performance textiles, cosmetic-related products such as healthcare, skincare, etc. It can manufacture.

In addition, the high strength composite nanofiber aggregate (high strength composite nanofiber nonwoven fabric, high strength composite nanofiber filament) of the present invention manufactured by the method for producing the high strength composite nanofiber aggregate of the present invention is a high strength composite nanofiber aggregate having high mechanical strength. Therefore, it can be used for a wide use as mentioned above.

[Embodiment 1]

2 to 5 are diagrams for explaining the method for producing a composite nanofiber aggregate according to the first embodiment. 2 is a manufacturing apparatus of the composite nanofiber aggregate for performing the 1st process of the manufacturing method of the composite nanofiber aggregate which concerns on Embodiment 1 (henceforth, it may be described as "a composite nanofiber aggregate manufacturing apparatus."). It is a block diagram of (11). In FIG. 2, some members are shown as sectional drawing. FIG. 3 is a view for explaining the composite nanofiber nonwoven fabric produced by the composite nanofiber aggregate manufacturing apparatus 11. Figure 3 (a) is a perspective view showing a part of the composite nanofiber nonwoven fabric, Figure 3 (b) is a schematic diagram showing an enlarged portion of the composite nanofiber nonwoven fabric. FIG. 4 schematically shows an apparatus for producing a high strength composite nanofiber aggregate (hereinafter sometimes referred to as a "high strength composite nanofiber aggregate manufacturing apparatus") 51 for carrying out the second step shown in FIG. 1. One drawing. Fig. 4A is a front view and Fig. 4B is a plan view. FIG. 5 is an enlarged schematic view of a part of the high strength composite nanofiber aggregate manufactured by the high strength composite nanofiber aggregate manufacturing apparatus 51.

The composite nanofiber aggregate manufacturing apparatus 11 which concerns on embodiment is equipped with the conveying apparatus 10 and the field emission apparatus 20 as shown in FIG.

The conveying apparatus 10 is located between the feeding roller 101 which throws in the long sheet W, the winding roller 102 which winds the long sheet W, and between the feeding roller 101 and the winding roller 102. The auxiliary rollers 103 and 104 are provided, and the long sheet W is conveyed in the arrow a direction (called the conveyance direction a) at a predetermined conveyance speed. In addition, the feed roller 101 and the winding roller 102 have a structure which is rotationally driven by the drive motor which is not shown in figure.

As shown in FIG. 2, the electric field radiating device 20 includes a conductive housing 100, a nozzle unit 110, a collector 150, a power supply device 160, an auxiliary belt device 170, and a polymer solution. A tank 200 and a polymer solution supply device 210 are provided.

The polymer solution tank 200 stores "the polymer solution containing a 1st polymer and a 2nd polymer" which melt | dissolved the polyurethane as a 1st polymer and polyvinylidene fluoride as a 2nd polymer in a solvent. In addition, "the polymer solution containing a 1st polymer and a 2nd polymer" is only hereafter called "polymer solution." The polymer solution tank 200 is preferably provided with a stirring device (not shown) for stirring the polymer solution.

Dichloromethane, dimethylformamide, dimethyl sulfoxide, methyl ethyl ketone, chloroform, acetone, water, formic acid, acetic acid, cyclohexane, THF, etc. can be used as a solvent for making a polymer solution, for example. A plurality of kinds of solvents may be mixed and used. In addition, the polymer solution may contain additives such as a conductivity enhancer.

The polymer solution supply device 210 includes a valve 214 that can control the supply amount of the polymer solution and a distribution pipe 212 that distributes the polymer solution to the nozzle unit 110.

In the polymer solution tank 200 and the polymer solution supply device 210, it is preferable to provide a heat retention device (not shown) for insulating the polymer solution at a predetermined temperature (for example, 60 ° C. to 80 ° C.).

The nozzle unit 110 has a plurality of nozzles 120 and a polymer solution supply passage 122. In addition, a polymer solution recovery passage (not shown) for recovering the polymer solution overflowed from the nozzle 120 may be provided. In the composite nanofiber aggregate manufacturing apparatus 11 according to the first embodiment, a nozzle unit having various sizes and various shapes can be used as the nozzle unit 110. However, the nozzle unit 110 may be, for example, viewed from the top. One side has a size and shape that appears to be a rectangle (including squares) of 0.5 m to 3 m.

The plurality of nozzles 120 are two-dimensionally arranged on the plane of the nozzle unit 110 at a pitch of, for example, 1.5 cm to 6.0 cm. The number of the plurality of nozzles 120 may be, for example, 36 (6 × 6 when arranged in the vertical and horizontal numbers) to 21904 (148 × 148 when arranged in the vertical and horizontal numbers). .

The inside of the nozzle 120 is a cavity, and the cavity communicates with the cavity in the polymer solution supply passage 122. The nozzle 120 discharges the polymer solution upwardly from the discharge port. In addition, the nozzle 120 is made of a conductor, and for example, copper, stainless steel, aluminum, or the like may be used. The nozzle unit is also made of a conductor, and may use the same material as the nozzle 120.

The inside of the polymer solution supply passage 122 is a cavity, and a distribution pipe 212 of the polymer solution supply apparatus 210 is connected. Thereby, the polymer solution stored in the polymer solution tank 200 flows through the distribution pipe 212, flows into the polymer solution supply path 122, and is supplied to each nozzle 120. FIG.

The collector 150 is disposed at a position facing the plurality of nozzles 120. The collector 150 is made of a conductor, and as shown in FIG. 2, is mounted to the housing body 100 via an insulating member 152.

The power supply device 160 applies a high voltage between the nozzle 120 and the collector 150. The anode of the power supply device 160 is connected to the collector 150, and the cathode of the power supply device 160 is connected to the nozzle unit 110 through the housing body 100.

The auxiliary belt device 170 includes an auxiliary belt 172 which rotates in synchronization with the conveyance speed of the long sheet W, and five rollers 174 for assisting the auxiliary belt 172. One or two or more rollers for the auxiliary belt rollers 174 of the five auxiliary belt rollers 174 are drive rollers, and the remaining rollers for the auxiliary belts are driven rollers. Since the auxiliary belt 172 is provided between the collector 150 and the long sheet W, the long sheet W is smoothly conveyed without being pulled by the collector 150 to which a positive high voltage is applied.

The field radiating device 20 configured as described above discharges the polymer solution from the discharge ports of the plurality of nozzles 120 while overflowing the polymer solution, and comprises the first nanofibers 310 and the second polymer made of the first polymer contained in the polymer solution. The formed second nanofibers 320 are deposited on the long sheet W.

By using the composite nanofiber aggregate manufacturing apparatus 11 explained above, the 1st process (step S1) of FIG. 1 can be implemented, and thereby composite nanofiber nonwoven fabric 300A as a composite nanofiber aggregate (refer FIG. 3). Can be prepared.

As shown in FIG. 3, the composite nanofiber nonwoven fabric 300A includes a first nanofiber 310 made of a first polymer (polyurethane) having a first melting point (T1) and a second melting point (T2). It is a composite nanofiber nonwoven fabric having a second nanofiber 320 made of a second polymer (polyvinylidene fluoride). The thickness of the said composite nanofiber nonwoven fabric 300A exists in the range of 1 micrometer-100 micrometers, for example, 50 micrometers. In addition, although the long sheet W is shown in FIG. 3, you may have made the long sheet W peeled.

In addition, in this specification, the composite nanofiber consisting of the 1st nanofiber 310 and the 2nd nanofiber 320 containing the elongate sheet W may be called "a composite nanofiber nonwoven fabric", and the elongate sheet W The composite nanofibers made of the first nanofibers 310 and the second nanofibers 320 in a peeled state may also be referred to as "composite nanofiber nonwoven fabrics".

The average diameter of the first nanofibers 310 is in the range of 500 nm to 3000 nm, for example, 900 nm. The average diameter of the second nanofibers 320 is in the range of 50 nm to 1000 nm, for example, 100 nm. By setting the average diameters of the first nanofibers 310 and the second nanofibers 320 in this manner, the relationship of “0.01 ≦ D2 / D1 ≦ 0.50” can be satisfied.

In addition, in the composite nanofiber nonwoven fabric 300A, the weight M1 of the first nanofibers and the weight M2 of the second nanofibers contained in the composite nanofiber nonwoven fabric 300A are “0.01 ≦ M2 / (M1 + M2). It is preferable to satisfy the relationship of?

When the composite nanofiber nonwoven fabric 300A is manufactured as described above, using the high strength composite nanofiber aggregate manufacturing apparatus 51 shown in FIG. 4, the composite nanofiber nonwoven fabric 300A for producing a high strength composite nanofiber nonwoven fabric The second step is carried out.

As shown in FIG. 4, the high-strength composite nanofiber aggregate manufacturing apparatus 51 is a conveying apparatus 60 that conveys the composite nanofiber nonwoven fabric 300A along the conveying direction a and the conveying apparatus 60. The pressurization and heating apparatus 70 which heats while pressurizing 300 A of composite nanofiber nonwoven fabrics conveyed is provided.

The conveying apparatus 60 is an injection roller 601 which feeds the composite nanofiber nonwoven fabric 300A, and a composite nanofiber nonwoven fabric which is strengthened by the pressurizing / heating device 70 (referred to as a high strength composite nanofiber nonwoven fabric 300B). And winding rollers 602 for winding the rollers, and auxiliary rollers 603 and 604 provided between the feeding roller 601 and the winding rollers 602. In addition, the conveying apparatus 60 has various components, such as a drive part which drives the input roller 601 and the winding roller 602, in addition to these components, Such illustration is abbreviate | omitted.

The pressurization and heating apparatus 70 is made into a high strength composite nanofiber nonwoven fabric by heating while pressurizing the composite nanofiber nonwoven fabric 300A to be conveyed. Moreover, the calender roll 701 can be used as a pressurization apparatus. In addition, the heating apparatus for heating the composite nanofiber nonwoven fabric 300A is not particularly limited, and for example, a heater function (not shown) may be put into the calender roll 701, and the composite nanofiber nonwoven fabric ( A heating device (not shown) for directly heating 300A) may be provided. In addition, as a heating apparatus, a resistance heater, an infrared heater, a combustion heater, a dryer, a hot air generator, etc. can also be used, for example.

In addition, it is preferable to make heating temperature T3 at the time of heating the composite nanofiber nonwoven fabric 300A about the temperature of the 1st melting point T1 and the 2nd melting point T2. For example, when 1st melting | fusing point T1 is 200 degree | times and 2nd melting | fusing point T1 is 140 degree | times, it is preferable to make heating temperature T3 about 170 degree | times.

In addition, in FIG. 4, although the calender roll 701 illustrated the structure which pinches the composite nanofiber nonwoven fabric 300A with the roller of one upper and one lower, it is not limited to such a structure, The roller of two upper and lower exists, etc. You can use calender rolls with various configurations.

Thus, the high strength composite nanofiber nonwoven fabric 300B shown in FIG. 5 can be manufactured by heating the composite nanofiber nonwoven fabric 300A to the heating temperature T3 while pressurizing the composite nanofiber nonwoven fabric 300A by the pressurizing and heating device 70. have. 5A illustrates a case where most of the second nanofibers 320 are melted, and FIG. 5B illustrates a case where the second nanofibers 320 remain.

That is, since the heating temperature T3 at the time of pressurization and heating by the pressurization and heating apparatus 70 is lower than 1st melting | fusing point T1, and higher than 2nd melting | fusing point T2, the 2nd which consists of 2nd polymers Nanofiber 320 is melted. At this time, when the composite nanofiber nonwoven fabric 300A is pressed, the molten second nanofibers 320 are entangled with a plurality of first nanofibers 310 and 310 as shown in FIG. At each intersection of…,…), and when it is solidified in that state, the first nanofibers 310 are joined by the second nanofibers 320 at each intersection. It becomes a state.

In FIG. 5, the hatched portion shows a state in which the molten second nanofibers are solidified at the intersections of the first nanofibers. As a result, the first nanofibers 310 are partially joined by the second nanofibers 320. In addition, the part in which the 1st nanofibers 310 become the state couple | bonded partially by the 2nd nanofiber 320 is called "coupling part C."

As such, since the bonding portion C is formed by the molten second nanofibers 320 at each intersection point of the first nanofibers 310, 310,..., The high-strength composite nanofiber nonwoven fabric 300B having high mechanical strength. ) Can be manufactured. In addition, the high-strength composite nanofiber nonwoven fabric 300B manufactured by the method for manufacturing a high-strength composite nanofiber nonwoven fabric according to Embodiment 1 has only a portion C of the first nanofibers 310 partially formed therein, so that the high-strength composite The whole nanofiber nonwoven fabric 300B is not rigid, and it can be set as a high strength composite nanofiber nonwoven fabric, maintaining the "flexibility" as a composite nanofiber nonwoven fabric to some extent.

In addition, in FIG. 5A, the second nanofibers 320 other than the bonding portions C of the first nanofibers 310, 310,... Are completely dissolved, but the heating temperature is a predetermined temperature. By setting it to, it is also possible to leave the second nanofibers 320 other than the bonding portions C of the first nanofibers 310, 310,...

For example, when the heating temperature is set to a temperature approximately equal to the melting point T2, the second nanofibers 320 are not completely melted, and a possibility that some of them remain. However, when the composite nanofiber nonwoven fabric 300A is pressurized, a greater pressing force is applied to each intersection of the first nanofibers 310, 310,..., So that the second nanofiber 320 is melted at the intersection. It becomes easy to do it, and the coupling | bonding part C can be formed in each intersection.

As a result, for example, as illustrated in FIG. 5B, the second nanofibers other than the bonding portions C of the first nanofibers 310, 310,... Are not completely melted. A portion remains, and at each intersection of the first nanofibers 310, 310,..., A high strength composite nanofiber nonwoven fabric 300C having a bonding portion C is formed. In this case, the remaining second nanofibers 320 become thinner or broken than the original second nanofibers 320 (see FIG. 3B).

As described above, the high-strength composite nanofiber nonwoven fabric 300C in which the second nanofibers remain is a high-strength composite nanofiber nonwoven fabric having different properties from that of the high-strength composite nanofiber nonwoven fabric 300B in which the second nanofibers are completely dissolved. You can do

In addition, although the presence of the long sheet W was not specified in the 2nd process of the manufacturing method of the high strength composite nanofiber aggregate which concerns on above-mentioned Embodiment 1, when carrying out a 2nd process, the long sheet W exists. One state may be sufficient and the long sheet W may be peeled off. This can be arbitrarily selected according to the kind of high strength composite nanofiber nonwoven fabric to be produced, and the like.

[Embodiment 2]

In Embodiment 1 and Embodiment 2, a case of producing a high strength composite nanofiber nonwoven fabric as a high strength composite nanofiber aggregate was described, but a high strength composite nanofiber filament can be produced as a high strength composite nanofiber aggregate. Also in this case, the first process (step S1) and the second process (step S2) described in FIG. 1 are performed. However, in the manufacturing method of the high strength composite nanofiber aggregate which concerns on Embodiment 2, a band-shaped composite nanofiber nonwoven fabric (referred to as a strip | belt-shaped composite nanofiber nonwoven fabric) is created first in a 1st process, and the said band shape is carried out in a 2nd process. A high strength composite nanofiber filament is produced by heating a composite nanofiber nonwoven fabric while twisting and stretching.

6 to 8 are diagrams for explaining the method for producing a composite nanofiber aggregate according to the second embodiment. FIG. 6: is a figure which shows typically the principal part structure of the composite nanofiber aggregate manufacturing apparatus 12 for implementing the 1st process of the manufacturing method of the composite nanofiber aggregate which concerns on Embodiment 3, FIG. 6B is a front view. FIG. 7: is a figure which shows typically the structure of the high strength composite nanofiber aggregate manufacturing apparatus 52 for implementing the 2nd process of the manufacturing method of the composite nanofiber aggregate which concerns on Embodiment 3. As shown in FIG. 8 is a view showing the production of high strength composite nanofiber filaments as a high strength composite nanofiber aggregate. In addition, FIG. 8 illustrates the production of high strength composite nanofiber filaments from one of the band-shaped composite nanofiber nonwoven fabrics among the plurality of band-shaped composite nanofiber nonwoven fabrics.

The composite nanofiber aggregate manufacturing apparatus 12 shown in FIG. 6 differs from the composite nanofiber aggregate manufacturing apparatus 11 shown in FIG. 2 in that the composite nanofiber aggregate manufacturing apparatus 12 is different from the electric field radiating device 20. Between the winding rollers 102, the long sheet W which winds the long sheet W peeled from the composite nanofiber nonwoven fabric, and the winding roller 105 and the composite nanofiber nonwoven fabric 300A in which the long sheet W was peeled off. The cutting device 80 is provided to make a strip shape, and since it is the same as the other component, the composite nanofiber aggregate manufacturing apparatus 11 shown in FIG. 2, the same code | symbol is attached | subjected to the same component. . In addition, the electric field radiating device 20 in FIG. 6 has the same structure as the electric field radiating device 20 shown in FIG.

The cutting device 80 is provided with a plurality of cutting edges 801 at predetermined intervals along the width direction of the composite nanofiber nonwoven fabric, and the composite nanofiber nonwoven fabric 300A is conveyed in the conveying direction a, Each cutting blade 801 has a structure in which the composite nanofiber nonwoven fabric 300A is cut along the conveyance direction a. In addition, the width | variety d of each strip | belt-shaped composite nanofiber nonwoven fabric after cutting is set to arbitrary width within the range of 1 mm-100 mm by adjusting the space | interval of each cutting blade 801, for example. have.

The composite nanofiber aggregate manufacturing apparatus 13 comprised in this way can perform the 1st process for manufacturing a strip | belt-shaped composite nanofiber nonwoven fabric. That is, the first nanofibers and the second nanofibers are deposited on the long sheet W by electrospinning the electrospinning device by the field emission device 20 to produce a composite nanofiber nonwoven fabric 300A. Subsequently, after peeling the elongate sheet W from the said composite nanofiber nonwoven fabric 300A, about the composite nanofiber nonwoven fabric 300A in which the elongate sheet W was peeled off, as shown to FIG. 6 (b). Similarly, the operation | movement which each cutting blade 801 of the cutting device 80 cut | disconnects is implemented.

As a result, a band-shaped composite nanofiber nonwoven fabric (referred to as a band-shaped composite nanofiber nonwoven fabric 300A1, 300A2, ...) having a predetermined width d is produced, and the band-shaped composite nanofiber nonwoven fabric 300A1, 300A2, ...) is wound around the winding roller 102.

Thus, when a strip | belt-shaped composite nanofiber nonwoven fabric is manufactured, a 2nd process is performed by the high strength composite nanofiber aggregate manufacturing apparatus 52 then. In the second step, the high-strength composite nanofiber filaments as high-strength composite nanofiber aggregates are produced by heating the band-shaped composite nanofiber nonwoven fabric while twisting and stretching.

The high strength composite nanofiber aggregate manufacturing apparatus 52 manufactures the high strength composite nanofiber filaments 300F1, 300F2, ... by heating the band-shaped composite nanofiber nonwoven fabrics 300A1, 300A2, ... while twisting and stretching. It is.

As shown in FIG. 7, the high strength composite nanofiber aggregate manufacturing apparatus 52 includes a feed roller 521 for feeding the strip-shaped composite nanofiber nonwoven fabrics 300A1, 300A2, ..., and the strip-shaped composite nanofiber nonwoven fabric 300A1. , 300A2, ...) twisted yarn device 520 to be "composite nano fiber filament" by twisting yarn, and "composite nano fiber filament" in the process of stretching while conveying yarn by twisted yarn device 520 And a winding roller 527 which winds the high strength composite nanofiber filaments 300F1, 300F2,... In addition, although the twist yarn 520 and the heating device 530 are not shown in FIG. 7, they are respectively provided corresponding to each strip | belt-shaped composite nanofiber nonwoven fabric 300A1, 300A2, ....

The twist yarn 520 has a main twist yarn 521 and two yarn feeders 522 and 523, as shown in detail in FIG. 8, and has a band-shaped composite nanofiber by the main twist yarn 521. After twisting a nonwoven fabric (for example, a band-shaped composite nanofiber nonwoven fabric 300A1) into a composite nanofiber filament, the yarn is twisted from the left side to the right side of FIG. 8 by the thread feeders 522 and 523. Send it. Then, the composite nanofiber filament is heated by the heating device 530 in the process of sending the yarn.

Thereby, firmly twisted "high strength composite nanofiber filament (F1)" can be manufactured continuously. In addition, when the yarn is sent by the yarn feeders 522 and 523, the yarn feed rate V1 of the yarn feeder 523 is made faster than the yarn feed rate V2 of the yarn feeder 522. Thereby, it can extend | stretch a composite nanofiber filament, sending a thread.

According to the high strength composite nanofiber aggregate manufacturing apparatus 52 comprised in this way, firmly twisted "high strength composite nanofiber filament 300F1, 300F2 ..." can be manufactured continuously.

However, the heating device 530 is not particularly limited, and for example, a laser light irradiation device or the like can be used. When the laser beam output from the laser beam irradiation apparatus is irradiated to the "composite nanofiber filament" twisted by the twist yarn 520, for example, in the area | region R1 to which the laser beam was irradiated (refer FIG. 8), The composite nanofiber filaments are heated.

Here, the laser beam irradiation apparatus is adjusted so that the temperature (heating temperature) T3 of the composite nanofiber filament in the region R1 is T1> T3> T2 at the first melting point T1 and the second melting point T2. In other words, only the second nanofiber 320 made of the second polymer melts. At this time, since the composite nanofiber filaments are twisted and stretched, the composite nanofiber filaments are in the same state as the pressed ones, so that the plurality of first nanofibers 310, 310, At each intersection point of ...), the bonding part C (refer FIG. 5) by which the molten 2nd nanofiber 320 solidifies is formed.

In this case as well, by selecting the heating temperature T3, the second nanofiber 320 made of the second polymer is completely dissolved except for the bonding portion C, as shown in Fig. 5A. In addition, as shown in FIG. 5 (b), a part of it can be left.

By carrying out the above steps, the produced high strength composite nanofiber filaments 300F1, 300F2, ... are formed by the second nanofibers 320 at the intersections of the first nanofibers 310, 310,... Since the nanofibers are partially bonded to each other, even when tensile stress is applied to the high-strength composite nanofiber filaments 300F1, 300F2,..., Sliding of the first nanofibers is less likely to occur, and compared to the conventional nanofiber filaments. It can be set as a high strength nanofiber filament.

In addition, the high-strength composite nanofiber filaments 300F1, 300F2,... Manufactured by the method for manufacturing the high-strength composite nanofiber aggregate according to Embodiment 3 only partially have a bonding portion C of the first nanofibers 310. Therefore, the whole high strength composite nanofiber filament is not rigid, and it can be set as a high strength composite nanofiber filament, maintaining the "flexibility" as a composite nanofiber filament to some extent.

[Embodiment 3]

In Embodiment 2, the composite nanofiber aggregate manufacturing apparatus 13 for performing a 1st process (process which manufactures a strip | belt-shaped composite nanofiber nonwoven fabric) first manufactures the sheet-like composite nanofiber nonwoven fabric 300A, and the said sheet | seat Although the band-shaped composite nanofiber nonwoven fabrics 300A1, 300A2, ... were manufactured by cutting the composite nanofiber nonwoven fabric 300A of the upper layer with the cutting device 80, in Embodiment 3, from the beginning by the field emission method, Band-shaped composite nanofiber nonwoven fabrics 300A1, 300A2, ... are prepared.

FIG. 9 is a view for explaining a method for producing a high strength composite nanofiber aggregate according to a third embodiment. FIG. 9 (a) and 9 (b) show the case where the belt-shaped composite nanofiber nonwoven fabrics 300A1, 300A2, ... are manufactured at different angles using the composite nanofiber aggregate manufacturing apparatus 13, respectively. 9 (c) is a diagram showing a band-shaped composite nanofiber nonwoven fabric 300A1 among the band-shaped composite nanofiber nonwoven fabrics 300A1, 300A2, ... manufactured by the drum-shaped collector 400. FIG. to be.

The composite nanofiber aggregate manufacturing apparatus 13 is provided with the drum-shaped collector 400 in which the strip | belt-shaped collector 401 extended in the circumferential direction is formed in the drum outer peripheral surface as a collector of the field emission apparatus 20. As shown in FIG. The first nanofiber and the second nanofiber are formed by subjecting the field collector to a state in which a high voltage is applied between the band-shaped collector 401 of the drum-shaped collector 400 and the nozzle 120 for discharging the polymer solution. It is possible to manufacture a strip-shaped composite nanofiber nonwoven fabric 300A1, 300A2, ... made of fibers.

In addition, although only one nozzle 120 is shown in FIG. 9, a plurality of nozzles 120 are actually present.

The drum-shaped collector 400 alternates a disk-shaped conductor disk 403 having a predetermined thickness and a disk-shaped non-conductive disk 404 having a predetermined thickness on the rotation shaft 402 of the conductor. The conductive disk 403 and the non-conductive disk 404 are configured to rotate together with the rotation shaft 402. In addition, one side of the rotating shaft 402 is connected to the motor 406 through the bearing 405, and the other side of the rotating shaft 402 is connected to the power supply device 160. In addition, the bearing 405 is comprised so that the motor 406 and the rotating shaft 402 may be electrically insulated.

The 1st process for manufacturing a strip | belt-shaped composite nanofiber nonwoven fabric using the composite nanofiber aggregate manufacturing apparatus 13 comprised in this way is demonstrated.

When a high voltage is applied between the band-shaped collector 401 and the nozzle 120 of the drum-shaped collector 400 to perform field radiation, the first nanofibers and the second nanofibers are formed on the band-shaped collector 401. The composite nanofibers made are deposited. At this time, as shown in FIG. 9B, the drum is rotated at low speed in the direction of the arrow c shown in FIG. Composite nanofibers consisting of the first nanofibers and the second nanofibers can be continuously deposited in the circumferential direction on the outer circumferential surface of the band-shaped collector 401 of the shape collector 400.

While performing such electric field spinning, the first nanofibers and the first nanofibers and the first nanofibers made of the second nanofibers are wound on the winding rollers 409 through the auxiliary rollers 407 and 408. The composite nanofibers made of two nanofibers can be continuously recovered as a band-shaped composite nanofiber nonwoven fabric (300A1, 300A2, ...).

According to the 1st process of the high-strength composite nanofiber aggregate manufacturing method which concerns on Embodiment 3, it becomes possible to manufacture band-shaped composite nanofiber nonwoven fabric 300A1, 300A2, ... efficiently with high productivity. Moreover, since it is made from strip | belt-shaped composite nanofiber nonwoven fabric (300A1, 300A2, ...) from the beginning, the cutting device for making a strip | belt-shaped composite nanofiber nonwoven fabric becomes unnecessary.

The strip | belt-shaped composite nanofiber nonwoven fabric 300A1, 300A2, ... can be manufactured by the 1st process shown above. Then, using the band-shaped composite nanofiber nonwoven fabrics 300A1, 300A2, ..., a high-strength composite nanofiber filament can be produced by performing a second step for producing a high-strength composite nanofiber aggregate. In addition, the second process for producing the high strength composite nanofiber aggregate is performed using the high strength composite nanofiber aggregate manufacturing apparatus 52 (see FIG. 7) described in the manufacturing method of the high strength composite nanofiber aggregate according to the second embodiment. Since it can implement similarly to 8, the description is abbreviate | omitted here.

As mentioned above, although the manufacturing method of the high strength composite nanofiber aggregate of this invention was demonstrated based on said each embodiment, this invention is not limited to this, It is possible to implement in the range which does not deviate from the summary, for example, The following variations are also possible.

(1) In each of the embodiments described above, a case in which a polyurethane is used as the first polymer and polyvinylidene fluoride is used as the second polymer is not limited thereto, and the various conditions described in the above embodiments, such as melting point, are satisfied. It is also possible to use polymers of different materials. For example, polylactic acid (PLA), polypropylene (PP), polyvinyl acetate (PVAc), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyamide (PA ), Polyvinyl alcohol (PVA), polyacrylonitrile (PAN), polyetherimide (PEI), polycaprolactone (PCL), polylactic acid glycolic acid (PLGA), silk, cellulose, chitosan and the like.

(2) In the above embodiments, the first polymer and the second polymer exemplified a case where a polymer having a different material is used. However, the first polymer and the second polymer are not limited to those of different materials, respectively, but are polymers of the same material. And a polymer having another number average molecular weight. For example, when using polyurethane as a polymer, it is also possible to use two polymers with different number average molecular weights as a 1st polymer and a 2nd polymer. This is because even if the first polymer and the second polymer are the same material, the melting point or the like can be changed by different number average molecular weights, and in the present invention, such a polymer can also be used.

(3) In Embodiment 1, the composite nanofiber aggregate manufacturing apparatus 11 which manufactures a composite nanofiber nonwoven fabric by depositing the 1st nanofiber 310 and the 2nd nanofiber 320 on the elongate sheet W is provided. Although illustrated, the present invention is not limited to such a composite nanofiber aggregate manufacturing apparatus, and the first and second nanofibers 310 and 320 are deposited directly on the collector without using the long sheet W. The composite nanofiber aggregate manufacturing apparatus which manufactures a fiber nonwoven fabric may be sufficient. The same applies to the composite nanofiber aggregate manufacturing apparatus 12 of Embodiment 2. FIG. In this case, the long sheet W winding roller 105 etc. which wind the long sheet W become unnecessary.

(4) In each said embodiment, although the composite nanofiber aggregate manufacturing apparatus for implementing a 1st process and the high strength composite nanofiber aggregate manufacturing apparatus for implementing a 2nd process were demonstrated as different apparatuses, these are one apparatus. It is also possible to assemble inside. By doing in this way, a 1st process and a 2nd process can be performed operation | work by one apparatus.

(5) Although the composite nanofiber aggregate manufacturing apparatus 11 of the said Embodiment 1 illustrated the case where there is one field emission apparatus 20, several field emission apparatuses along the conveyance direction a of the elongate sheet | seat W It is good also as a structure which has (20). By setting it as such a structure, it becomes possible to make thickness of a composite nanofiber nonwoven fabric into various thickness.

(6) When using the high strength composite nanofiber aggregate of this invention as a separator of a secondary battery, it is preferable to set the 2nd melting point of a 2nd polymer in the range of 150 degreeC-180 degreeC. By setting it as such a structure, when a temperature of a separator rises to 150 degreeC-180 degreeC, since a 2nd polymer melts and the pore of a separator is clogged, the function of shutting down a separator can be made to function effectively. In this case, when the weight of the first nanofiber is "M1" and the weight of the second nanofiber is "M2", it is preferable to satisfy the relationship of "0.40≤M2 / (M1 + M2)". Do. In this case, it is preferable to set the first melting point of the first polymer to a temperature of 200 ° C or higher. By setting it as such a structure, even if the temperature of a separator rises to 150 degreeC-180 degreeC and a 2nd polymer melt | dissolves, since a 1st polymer does not melt, heat shrink of a separator can be suppressed small.

(7) When using the high strength composite nanofiber aggregate of this invention as a separator of a secondary battery, it is also preferable to set the 1st melting | fusing point of a 1st polymer in the range of 150 degreeC-180 degreeC. By setting it as such a structure, when the temperature of a separator rises to 150 degreeC-180 degreeC, a 1st polymer and a 2nd polymer will melt | dissolve and the pore of a separator will be clogged surely, and a shutdown function of a separator can be made to function effectively.

(8) When using the high strength composite nanofiber aggregate of the present invention as a separator for a secondary battery for a vehicle, it is also preferable to set both the first melting point of the first polymer and the second melting point of the second polymer to 200 ° C or higher. By setting it as such a structure, even when the temperature of a secondary battery rises to the temperature of about 150 degreeC, a separator will not deteriorate and a highly reliable separator can be comprised.

10, 60: conveying device
11, 12, 13: composite nanofiber aggregate manufacturing apparatus
20: field radiating device
51, 52: apparatus for producing high strength composite nanofiber aggregate
70 pressurization and heating device
80: cutting device
101: feed roller
102: winding roller
110: nozzle unit
120: nozzle
170: auxiliary belt device
200: polymer solution tank
300A: Composite Nanofiber Nonwoven
300A1, 300A2: Band-shaped Composite Nanofiber Nonwoven Fabric
300B: High Strength Composite Nanofiber Nonwoven Fabric
300F1, 300F2: High Strength Composite Nanofiber Filaments
400: Drum Shape Collector
401: Belt Shape Collector
402: axis of rotation
403: Conductor Disc
404: non-conducting disc
520: twisted yarn device
521: main kink
522, 523: Thread feeder
530: heating device
701: calendar roll
801: cutting blade
a: conveying direction
W: long sheet

Claims (12)

A first process for producing a composite nanofiber aggregate comprising a first polymer having a first melting point and a second polymer having a second melting point lower than the first melting point, and
By heating the composite nanofiber aggregate to a temperature lower than the first melting point and higher than the second melting point, a high strength composite nano having a structure in which first nanofibers made of the first polymer are partially bonded by the second polymer. A second process for producing a fiber aggregate in this order,
In the first step, a band-shaped composite nanofiber nonwoven fabric is prepared as the composite nanofiber aggregate,
In the second step, high-strength composite nanofiber filaments as the high-strength composite nanofiber aggregates are produced by heating the band-shaped composite nanofiber nonwoven fabric while twisting and stretching. Method for producing a fiber aggregate. delete The method of claim 1,
In the first step, the composite nanofiber nonwoven fabric is produced by electric field spinning using a polymer solution containing the first polymer and the second polymer. delete The method of claim 1,
In the first step, the composite nanofiber nonwoven fabric is produced by electric field spinning using a polymer solution containing the first polymer and the second polymer, and then the composite nanofiber nonwoven fabric is cut to form the band-shaped composite. A method for producing a high strength composite nanofiber aggregate, comprising producing a nanofiber nonwoven fabric. The method of claim 1,
In the first step, the band-shaped composite nanofiber nonwoven fabric is produced by field spinning in a band shape using a polymer solution containing the first polymer and the second polymer. Way. The method according to any one of claims 1, 3, 5 and 6,
When the weight of the first nanofibers contained in the composite nanofiber aggregate is "M1", and the weight of the second nanofibers made of the second polymer contained in the composite nanofiber aggregate is "M2", A method for producing a high strength composite nanofiber aggregate, wherein the relationship of "0.01≤M2 / (M1 + M2) ≤0.40" is satisfied. The method according to any one of claims 1, 3, 5 and 6,
When the average diameter of the first nanofibers is "D1" and the average diameter of the second nanofibers made of the second polymer is "D2", the relationship of "0.01≤D2 / D1≤0.50" is satisfied. Method for producing a high strength composite nanofiber aggregate, characterized in that. The method according to any one of claims 1, 3, 5 and 6,
When the said 1st melting point is set to "T1" and the said 2nd melting point is set to "T2", the relationship of "T1-T2≥10 degreeC" is satisfied, The manufacturing method of the high-strength composite nanofiber aggregate characterized by the above-mentioned. The method according to any one of claims 1, 3, 5 and 6,
The first polymer and the second polymer is a method of producing a high strength composite nanofiber aggregate, characterized in that the polymer of different materials. The method according to any one of claims 1, 3, 5 and 6,
The first polymer and the second polymer is the same material, and a method of producing a high-strength composite nanofiber aggregate, characterized in that the polymer having a different number average molecular weight.
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