High-strength two-component thermosetting resin nanofiber membrane and manufacturing method therefor

Abstract

An embodiment of the present invention provides a high-strength two-component thermosetting resin nanofiber membrane and a manufacturing method therefor. A high-strength two-component thermosetting resin-based nanofiber according to an embodiment of the present invention has a diameter of less than 1 µm and a high specific surface area and high porosity, thereby having an effect of being easy to serve as a support. In addition, the manufacturing method for a high-strength two-component thermosetting resin nanofiber membrane is an eco-friendly fiber manufacturing method that uses minimal solvent during processing as compared to conventional electrospun fiber membranes, and thus is less harmful to workers and users. Through an electrospinning device including an accelerated curing device and an air injection device, a two-component thermosetting resin nanofiber membrane that is difficult to manufacture with conventional electrospinning devices may be manufactured.

Description

High-strength two-component thermosetting resin nanofiber membrane and method for manufacturing the same

[0001] The present invention relates to a high-strength two-component thermosetting resin nanofiber membrane and a method for manufacturing the same.

[0002] Nanofibers are ultrafine fibers with a specific surface area of ​​1 µm or less and are characterized by having a high specific surface area and porosity. Polymer-based nanofibers can be widely applied not only in the medical field (biomedical, filters, drug delivery, tissue engineering) but also in the field of electronic devices (energy storage, sensors, battery separators).

[0003] Electrospinning is a method for manufacturing the aforementioned nanofibers in which a polymer solution or melt is formed into nanofibers using an electrically charged nozzle. Although most nanofibers produced by electrospinning are manufactured using solution electrospinning, there are problems such as harmful effects on producers and consumers due to residual organic solvents, and low physical properties resulting from the use of low molecular weight thermoplastic resins.

[0004] To address this, high molecular weight resins are being applied, but this requires the absence of organic solvents. In this case, melt electrospinning presents limitations to the addition of functional nanomaterials due to the high viscosity of the resin.

[0005] Polymer-based nanofibers manufactured by electrospinning have problems such as residual toxic solvents, poor physical properties (solution electrospinning), or difficulty in using functional additives due to high viscosity (melt electrospinning).

[0006] Accordingly, high-strength nanofiber membranes are required because their application fields are limited due to their role as a support.

[0007]

[0008] (Prior Art Document 1) Korean Published Patent Application No. 2011-0098577

[0009]

[0010] The technical problem that the present invention aims to solve is to provide a high-strength two-component thermosetting resin nanofiber membrane and a method for manufacturing the same.

[0011] The technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0012]

[0013] To achieve the above technical problem, one embodiment of the present invention provides a high-strength two-component thermosetting resin nanofiber membrane.

[0014] The high-strength two-component thermosetting resin nanofiber membrane according to one embodiment of the present invention is composed of two-component thermosetting nanofibers having a diameter of less than 1 μm and composed of a two-component thermosetting resin composition consisting of a main component and a curing agent, manufactured by electrospinning the two-component thermosetting resin composition consisting of the main component and the curing agent, and has a mat form in which a plurality of two-component thermosetting nanofibers are aggregated, and the diameter of the two-component thermosetting nanofibers can be controlled by the electrospinning process.

[0015] In addition, according to one embodiment of the present invention, the two-component thermosetting resin composition may comprise a single or two or more thermosetting resins selected from the group consisting of urethane resin and epoxy resin.

[0016] In addition, according to one embodiment of the present invention, the tensile strength of the high-strength two-component thermosetting resin nanofiber membrane may be 6 MPa or higher.

[0017] In addition, according to one embodiment of the present invention, the diameter of the high-strength two-component thermosetting resin nanofiber may be 500 nm to 1000 nm.

[0018] In addition, according to one embodiment of the present invention, the thickness of the high-strength two-component thermosetting resin nanofiber membrane may be 15㎛ to 100㎛.

[0019]

[0020] To achieve the above technical problem, another embodiment of the present invention provides a method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane.

[0021] A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane according to one embodiment of the present invention may include: a step of preparing an electrospinning solution by homogenizing a two-component thermosetting resin and a solvent; a step of manufacturing two-component thermosetting resin nanofibers by performing an electrospinning process by controlling the distance between the nozzle tip and the collection plate of the electrospinning device, the voltage of the electrospinning device, and the injection speed of the electrospinning solution; and a step of manufacturing a high-strength two-component thermosetting resin nanofiber membrane by post-curing a plurality of two-component thermosetting resin nanofibers obtained by the electrospinning process so as to be fully cured by heat treatment.

[0022] In addition, according to one embodiment of the present invention, in the step of preparing the electrospinning solution, one or more thermosetting resins selected from the group consisting of urethane resin and epoxy resin may be included.

[0023] In addition, according to one embodiment of the present invention, in the step of preparing the electrospinning solution, the mixing weight ratio of the two-component thermosetting resin and the solvent may be 60:40 to 95:5.

[0024] In addition, according to one embodiment of the present invention, in the step of manufacturing the two-component thermosetting resin nanofiber, heat can be directly irradiated onto the spun fiber before it is collected on the collection plate through an accelerated curing device installed between the nozzle tip and the collection plate.

[0025] In addition, according to one embodiment of the present invention, in the step of manufacturing the two-component thermosetting resin nanofiber, the extruded fiber can be stretched by injecting air from the nozzle tip toward the collection plate by means of an air injection device installed surrounding the nozzle tip.

[0026] In addition, according to one embodiment of the present invention, in the step of manufacturing the two-component thermosetting resin nanofiber, the distance between the nozzle tip of the electrospinning device and the collection plate (TCD, Tip to Collector Distance) may be 100 mm to 300 mm.

[0027] In addition, according to one embodiment of the present invention, in the step of manufacturing the two-component thermosetting resin nanofiber, the voltage applied to the electrospinning device may be 8 kV to 20 kV.

[0028] In addition, according to one embodiment of the present invention, in the step of manufacturing the two-component thermosetting resin nanofiber, the injection rate of the electrospinning solution may be 0.5 ml / h to 2.0 ml / h.

[0029] In addition, according to one embodiment of the present invention, in the step of manufacturing the two-component thermosetting resin nanofiber, the diameter of the high-strength two-component thermosetting resin nanofiber may be 500 nm to 1000 nm.

[0030]

[0031] A high-strength two-component thermosetting resin nanofiber membrane according to one embodiment of the present invention has a diameter of less than 1 μm, has a high specific surface area and porosity, and is high-strength, so it has the effect of overcoming the limitations of thermoplastic resin fibers used as supports and is easy to use as a support.

[0032] In addition, it is an eco-friendly nanofiber that is less harmful to workers and users because it uses minimal solvent during the process compared to conventional electrospinning-based fiber membranes.

[0033] In addition, the method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane can manufacture a two-component thermosetting resin nanofiber membrane that is difficult to manufacture with a conventional electrospinning device by using an electrospinning device that includes an accelerated curing device and an air injection device.

[0034] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description of the invention or the claims.

[0035]

[0036] FIG. 1 is a schematic diagram showing an electrospinning system for manufacturing high-strength two-component thermosetting resin-based nanofibers.

[0037] FIG. 2 is a flowchart illustrating a method for manufacturing high-strength two-component thermosetting resin-based nanofibers.

[0038] FIG. 3 is an SEM image showing the surface condition of Comparative Examples 1 to 3 and Example 1.

[0039] Figure 4 is a graph and table showing the physical properties of Example 1 and Comparative Example 3.

[0040]

[0041] The present invention will be described below with reference to the attached drawings. However, the present invention may be implemented in various different forms and is therefore not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0042] Throughout the specification, when it is stated that a part is "connected (connected, in contact, combined)" with another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members interposed between them. Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components.

[0043] The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0044]

[0045] Hereinafter, the present invention will be described with reference to the drawings presented in this specification. For reference, the drawings may be partially exaggerated to illustrate the features of the present invention. In such cases, it is preferable to interpret them in light of the entire intent of this specification.

[0046]

[0047] A high-strength two-component thermosetting resin-based nanofiber membrane according to one embodiment of the present invention is described.

[0048] A high-strength two-component thermosetting resin nanofiber membrane according to one embodiment of the present invention is composed of two-component thermosetting nanofibers having a diameter of less than 1 μm and composed of a two-component thermosetting resin composition consisting of a main component and a curing agent, manufactured by electrospinning the two-component thermosetting resin composition consisting of the main component and the curing agent, and has a mat form in which a plurality of two-component thermosetting nanofibers are aggregated, and the diameter of the two-component thermosetting nanofibers can be controlled by the electrospinning process.

[0049] Generally, polymer-based nanofibers produced by electrospinning have faced problems such as residual toxic solvents, poor physical properties, and difficulties in using functional additives due to high viscosity. Consequently, conventional polymer-based nanofibers produced by electrospinning are limited in their application fields, serving primarily as supports. Although most electrospun nanofibers are manufactured via solution electrospinning, residual organic solvents pose harmful effects to producers and consumers, and the use of low-molecular-weight thermoplastic resins results in poor physical properties.

[0050] The present invention is a nanofiber membrane for solving the aforementioned problems, characterized by being manufactured by electrospinning a mixture containing a two-component thermosetting resin, and having a mat form as a composite of tens or hundreds of strands of nanofibers.

[0051] At this time, the two-component thermosetting resin composition consisting of a main component and a hardener is characterized in that both the main component and the hardener exist in a liquid state at room temperature and are cured at room temperature or heat-cured after mixing.

[0052] At this time, electrospinning using the above two-component resin can eliminate or minimize the use of organic solvents and facilitate the application of functional additives, thereby enabling the production of high-strength nanofibers through an eco-friendly process.

[0053] At this time, the two-component thermosetting resin composition used in the present invention may comprise a single or two or more thermosetting resins selected from the group consisting of urethane resin and epoxy resin, and may be used without limitation as long as the material can be used as a thermosetting resin, not limited to the examples described above.

[0054] At this time, the diameter of the high-strength two-component thermosetting resin-based nanofiber may be 500 to 1000 nm.

[0055] In addition, the tensile strength of the high-strength two-component thermosetting resin-based nanofiber may be 6 MPa or higher.

[0056] In addition, the thickness of the high-strength two-component thermosetting resin nanofiber membrane may be 15㎛ to 100㎛.

[0057] The proof regarding the diameter and physical properties of the above-mentioned high-strength two-component thermosetting resin-based nanofibers will be explained in detail in the following experimental examples.

[0058]

[0059] With reference to FIGS. 1 and 2, a method for manufacturing high-strength two-component thermosetting resin-based nanofibers according to another embodiment of the present invention will be described.

[0060] FIG. 1 is a schematic diagram showing the configuration of an apparatus for manufacturing high-strength two-component thermosetting resin-based nanofibers.

[0061] FIG. 2 is a flowchart illustrating a method for manufacturing high-strength two-component thermosetting resin-based nanofibers.

[0062] A method for manufacturing a high-strength two-component thermosetting resin-based nanofiber membrane according to one embodiment of the present invention may include: a step of preparing an electrospinning solution by homogenizing a two-component thermosetting resin and a solvent (S100); a step of manufacturing a two-component thermosetting resin nanofiber membrane by performing an electrospinning process by controlling the distance between the nozzle tip and the collection plate of the electrospinning device, the voltage of the electrospinning device, and the injection speed of the electrospinning solution (S200); and a step of post-curing the two-component thermosetting resin nanofiber membrane obtained by the electrospinning process so that it is fully cured by heat treatment (S300).

[0063] In the first step, the method may include the step of homogenizing a two-component thermosetting resin and a solvent to prepare an electrospinning solution. (S100)

[0064] At this time, the above-mentioned two-component thermosetting resin may be selected from a single type or two or more types of thermosetting resins selected from the group consisting of urethane resin and epoxy resin.

[0065] At this time, the two-component thermosetting resin composition used in the present invention may comprise a single or two or more thermosetting resins selected from the group consisting of urethane resin and epoxy resin, and may be used without limitation as long as the material can be used as a thermosetting resin, not limited to the examples described above.

[0066] The main component of the above urethane resin is in a two-component form and is C2-C 10 It is preferable to use a resin. More preferably, a urethane resin, such as a C3-C8 resin, is preferred. Subjects falling within the above range have the advantage of high strength and viscosity that is easy for the operator to use. However, there are no specific limitations as long as electrospinning is possible.

[0067] The curing agent of the above urethane resin may include an aromatic diamine that reacts with the isocyanate group of the main component.

[0068] The main component of the above epoxy resin may be one or more of the following: bisphenol A type epoxy resin, bisphenol E type epoxy resin, bisphenol F type epoxy resin, bisphenol M type epoxy resin, bisphenol S type epoxy resin, and phenyl type epoxy resin. More specifically, it may be bisphenol A type epoxy resin, bisphenol F type epoxy resin, and a mixture thereof.

[0069] It is preferable that the epoxy resin component has an epoxy equivalent of 170 to 300 g / eq, a viscosity of 200 to 8,000 cp, and is a liquid at room temperature. More preferably, it is 180 to 220 g / eq and 400 to 1,500 cp. In this case, if the epoxy is below the above range, the strength of the manufactured fiber may be weak, and the curing time required to reach the time required for electrospinning may be long, making the working time inefficient. If it exceeds the range, the high viscosity may cause difficulties for the operator when mixing with the curing agent, and there is a problem where electrospinning does not proceed due to the high initial viscosity. In other words, an epoxy resin satisfying the above range not only provides a viscosity with good workability but also helps improve the mechanical properties of the fiber membrane.

[0070] In the epoxy resin solution, the curing agent undergoes a curing reaction with the resin having epoxy groups, and can be used as one or a mixture of polyetheramine (PEA)-based and cycloaliphatic amine-based agents. The curing agent preferably has a viscosity of 200 to 8,000 cp and is in a liquid state at room temperature. However, the viscosity of the curing agent is not limited to the above range. Since the curing agent can be uniformly dissolved when mixed with the main component, any viscosity suitable for electrospinning is possible.

[0071] In addition, the main component and the curing agent of the above-mentioned two-component thermosetting resin can be mixed according to the mixing ratio provided by the manufacturer. Regarding the ratio of the main component to the curing agent, if the main component is more abundant, the main component remains uncured, making it impossible to manufacture nanofibers; if the curing agent is more abundant, complete curing is achieved, but the mechanical strength of the nanofiber membrane may be poor due to the remaining curing agent.

[0072] At this time, the mixing ratio (weight ratio) of the two-component thermosetting resin and the solvent may be 60:40 to 95:5. If included in an amount less than the above weight range, the solid content may be low, which may result in lower mechanical properties such as tensile strength. If included in an amount greater than the above weight range, rapid curing may occur, quickly reaching a high viscosity that makes electrospinning impossible, and fibers may not be generated at the nozzle tip.

[0073] At this time, the solvent is important as it determines the conductivity of the electrospinning solution. The solvent may be THF (Tetrahydrofuran), DMF (Dimethylformamide), DMAc (Dmethylacetamide), etc., used alone or in combination. The solvent may be included in an amount of 5 to 40 wt% based on the electrospinning solution. If the solvent is included in an amount less than the above weight range, the viscosity of the electrospinning solution may be high, making homogenization difficult. If the amount exceeds the above weight range, the resin content may decrease, leading to reduced mechanical strength, and not only is it difficult to control viscosity, but solvent may also remain in the manufactured nanofibers.

[0074]

[0075] In the second step, the method may include the step of manufacturing a two-component thermosetting resin nanofiber membrane by performing an electrospinning process by adjusting the distance between the nozzle tip and the collection plate of the electrospinning device, the voltage of the electrospinning device, and the injection speed of the electrospinning solution. (S200)

[0076] At this time, the electrospinning solution may be pre-cured before being installed in the electrospinning device or installed in a device that maintains viscosity provided in the electrospinning device to form a viscosity of 2,000 cps to 7,000 cps (25°C).

[0077] The viscosity of the electrospinning solution may more preferably be 2,500 to 5,000 cp. In this case, if the viscosity of the electrospinning solution is less than 2,000 cp, the surface tension of the electrospinning solution is low, so droplets are not formed and simple spraying of the solution occurs, which may result in no fiber formation. If the viscosity of the electrospinning solution exceeds 7,000 cp, the viscosity and surface tension are high, so a Taylor cone is not formed in the droplet, and spinning does not proceed. Furthermore, a high voltage may be applied to form a Taylor cone, and even if a Taylor cone is formed, its length may be long, causing it to be collected directly on a collection plate rather than as a fiber. Additionally, the diameter and thickness of the fiber may increase, which may affect the physical properties of the fiber membrane.

[0078] At this time, the distance between the nozzle tip (100) of the electrospinning device and the collection plate (400) (TCD, Tip to Collector Distance) may be 100 mm to 300 mm. More preferably, it may be 150 to 200 mm. At this time, if the TCD is less than 100 mm, there is insufficient time for fibers to form, so fibers with a thick diameter may be collected or solvent may accumulate on the collection plate. If the TCD exceeds 300 mm, the distance between the nozzle tip and the collection plate is too far, making it difficult to collect fibers.

[0079] In addition, the voltage applied to the electrospinning device may be 8 to 20 kV, and more preferably 10 to 15 kV. If the voltage is less than 8 kV, it is difficult to form a tail cone, so fibers may not be formed in the electrospinning solution. If the voltage exceeds 20 kV, fibers may scatter, and the amount collected on the collection plate may be small, and fibers with a large diameter may be formed.

[0080] In addition, the injection rate of the electrospinning solution may be 0.5 to 2.0 ml / h, and more preferably 1.0 to 1.5 ml / h. If the injection rate of the electrospinning solution is less than 0.5 ml / h, the solvent may evaporate before fiber formation and fall from the nozzle tip in solid form. If the injection rate exceeds 2.0 ml / h, there is insufficient time for the solvent to evaporate sufficiently before the fiber is collected on the collection plate, and fibers mixed with beads and having a thick diameter may be formed due to the low injection force.

[0081] Thus, a high-strength two-component thermosetting resin fiber membrane with a thickness of 15 to 100 μm can be manufactured through the above electrospinning process. If the thickness is less than 15 μm, it may be too thin to be suitable for use as a support, and if it exceeds 100 μm, mechanical properties may deteriorate. Not limited thereto, the high-strength two-component thermosetting resin fiber membrane of the present invention can be manufactured with a thickness freely according to the application field and utilized as a support.

[0082] In addition, in the second step, heat can be directly applied to the spun fibers before they are collected on the collection plate through an accelerated curing device installed between the nozzle tip and the collection plate to accelerate the curing speed of the fibers and fix the fiber structure. More preferably, accelerated curing can be achieved by applying heat between the tail cone and the collection plate. If the fibers are not accelerated cured, the uncured resin may be collected on the collection plate in a liquid state.

[0083] At this time, the device capable of heat irradiation may be a lamp that has high resistance and is easy to heat up, but is not limited thereto. At this time, the temperature applied to the fiber may be 40 to 80°C. If the temperature is below 40°C, there may not be enough heat to cure the fiber, so the fiber may not be collected on the collection plate, and if it exceeds 80°C, the temperature is too high and may affect the nozzle tip or tail cone, causing the electrospinning solution to harden and producing fibers with a thick diameter.

[0084] In addition, in the second step, the extruded fiber can be stretched by injecting air from the nozzle tip toward the collection plate using an air injection device installed around the nozzle tip.

[0085] At this time, referring to FIG. 1, the air injection device may be installed surrounded by the nozzle tip of the electrospinning device. However, it is not limited to this configuration; any configuration is possible in which it is installed close to the nozzle tip and can inject air in the direction of the collection plate, which is the direction in which the fibers extruded from the nozzle tip travel.

[0086] At this time, air is injected in the direction of the collection plate by the air injection device to stretch the cured two-component thermosetting fiber so that its diameter becomes nanometer-sized and to increase the amount of fiber collected.

[0087] In addition, the air injection speed from the air injection device may be 40 to 80 L / min, and more preferably 50 to 70 L / min. If the injection speed is less than 40 L / min, the effects of fiber stretching and high fiber collection may be negligible, and if it exceeds 80 L / min, the air injection speed is too high, which may affect the Taylor cone, worsen the spinning power, and deform the shape of the fibers collected on the collection plate.

[0088] In addition, the temperature of the air discharged from the air injection device can be adjusted according to the operator's requirements, but is not limited thereto.

[0089] At this time, the diameter of the high-strength two-component thermosetting resin-based nanofiber may be 500 to 1000 nm.

[0090]

[0091] In the third step, the method may include a step of post-curing the two-component thermosetting resin nanofiber membrane obtained by the electrospinning process so that it is fully cured by heat treatment. (S300)

[0092] In step S300, heat can be applied to the two-component thermosetting resin nanofiber membrane prepared in S200 to remove residual solvent (dry) and post-curing.

[0093] After step S200, trace amounts of solvent may remain in the nanofiber membrane, or the nanofibers may not be completely solidified.

[0094] At this time, equipment capable of applying heat to fibers, such as ovens and vacuum ovens, may be used, but is not limited thereto.

[0095] At this time, the post-curing temperature may be 40 to 80°C. If the temperature is below 40°C, there may not be enough heat to post-cure or dry the fibers, and residual solvent may remain, and if it exceeds 80°C, the temperature is too high and the fibers that are not fully cured may collapse.

[0096]

[0097] The present invention will be explained in more detail below through manufacturing examples and experimental examples. These manufacturing examples and experimental examples are solely for the purpose of illustrating the present invention, and the scope of the present invention is not limited by these manufacturing examples and experimental examples.

[0098]

[0099] Example 1: Two-component thermosetting resin-based nanofiber

[0100] First, 52g of the main component (YD-114, Kukdo Chemical) and 28g of the curing agent (KH-816, Kukdo Chemical) of a two-component epoxy resin are added to 20g of dimethylformamide (DMF), mixed, and homogenized to prepare an electrospinning solution.

[0101] At this time, the mixing weight ratio of the main component and the hardener is 65:35.

[0102] Next, the electrospinning solution is pre-cured under constant temperature conditions until its viscosity reaches 5,000 cps.

[0103] Next, the above-mentioned pre-cured electrospinning solution was introduced into an electrospinning device, and a two-component thermosetting resin nanofiber membrane was prepared by electrospinning with a TCD (distance between nozzle tip and collection plate) of 200 mm, a voltage of 15 kV, a mixture injection rate of 1.0 ml / h, an air injection device air injection rate of 60 L / min, and an accelerated curing device (ramp) temperature of 50°C.

[0104] Next, the obtained nanofiber membrane was treated in a 60°C oven for 2 hours to remove residual solvent and fully cure.

[0105]

[0106] Comparative Example 1: Two-component thermosetting fiber membrane of the conventional electrospinning method

[0107] First, 52g of the main component (YD-114, Kukdo Chemical) and 28g of the curing agent (KH-816, Kukdo Chemical) of a two-component epoxy resin are added to 20g of dimethylformamide (DMF), mixed, and homogenized to prepare an electrospinning solution.

[0108] At this time, the ratio of the main component to the hardener is 65:35.

[0109] Next, the electrospinning solution is pre-cured under constant temperature conditions until its viscosity reaches 5,000 cps.

[0110] Next, the above-mentioned pre-cured electrospinning solution was introduced into an electrospinning device, and a two-component thermosetting resin fiber membrane was manufactured by electrospinning at a TCD (distance between nozzle tip and collection plate) of 200 mm, a voltage of 15 kV, and a mixture injection rate of 1.0 ml / h.

[0111] Next, the obtained fiber membrane was treated in a 60°C oven for 2 hours to remove residual solvent and fully cure.

[0112]

[0113] Comparative Example 2: Accelerated curing two-component thermosetting fiber

[0114] In Comparative Example 2, a two-component thermosetting fiber accelerated and cured under the same conditions as Comparative Example 1 was prepared, except that an accelerated curing device was used during electrospinning in Comparative Example 1 described above.

[0115]

[0116] Comparative Example 3: Conventional TPU-based nanofiber

[0117] First, TPU in pellet form (ESTANE®X595A-12, Lubrizol Korea Co., Ltd.) is added to a THF / DMF (1:1) mixed solvent at a concentration of 15% by weight and homogenized.

[0118] Next, the mixture was electrospun under conditions of a TCD (distance between nozzle tip and collection plate) of 200 mm, a voltage of 15 kV, and a mixture injection rate of 1.0 ml / h to obtain a nanofiber membrane.

[0119]

[0120] Experimental Example 1: Experiment to Confirm Preparation of High-Strength Two-Part Thermosetting Resin-Based Nanofibers

[0121] FIG. 3 is an SEM image showing the surface condition of Comparative Examples 1 to 3 and Example 1.

[0122] Referring to Comparative Example 1, fibers were not formed by the ordinary electrospinning method.

[0123] In addition, fibers that underwent only accelerated curing through the accelerated curing device of Comparative Example 2 were manufactured with a diameter of micro-sized fibers.

[0124] In addition, in Example 1 of the present invention, which includes accelerated curing and stretching of the fiber through an accelerated curing device and an air injection device, nanofibers were formed.

[0125] In addition, Example 1 showed a more uniform fibrous structure compared to the nanofibers of the conventional thermoplastic resin in Comparative Example 3, although the diameter was similar.

[0126]

[0127] Experimental Example 2: Verification of Tensile Strength of High-Strength Two-Part Thermosetting Resin-Based Nanofibers

[0128] Figure 4 is a graph and table showing the physical properties of Example 1 and Comparative Example 3.

[0129] In Experimental Example 2, tensile strength was measured according to ASTM D638-5 standards.

[0130] Referring to FIG. 4, it can be seen that Example 1 exhibits a tensile strength approximately 5 times higher than Comparative Example 3.

[0131]

[0132] Resin Type Tensile Strength Chitosan 0.5 MPa NYLON 6 2 MPa PVDF 2 MPa PVC 2 MPa PVP 2 MPa PCL 4 MPa PLA 4 MPa Collagen 5 MPa PVA 6 MPa PU 6 MPa PLGA 7 MPa Example 1 27 MPa

[0133]

[0134] Referring to Table 1 above, the tensile strength of the high-strength two-component thermosetting resin-based nanofiber according to one embodiment of the present invention was measured to be 27 MPa. If the tensile strength is less than 6 MPa, it may not be suitable for use as a support due to weak mechanical properties, and since the tensile strength of the present invention is 6 MPa or higher, it is suitable for use as a support.

[0135]

[0136] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0137] The scope of the present invention is defined by the claims set forth below, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.

[0138]

[0139] <Explanation of Symbols>

[0140] 100: Nozzle tip

[0141] 200: Air inflator

[0142] 300: Accelerated hardening device

[0143] 400: Collector's Edition

Claims

1. Composed of two-component thermosetting nanofibers having a diameter of less than 1㎛ and composed of a two-component thermosetting resin composition consisting of a main component and a curing agent, A two-component thermosetting resin composition comprising the above subject and a curing agent is manufactured by electrospinning, and It has a mat form in which multiple two-component thermosetting nanofibers are aggregated, A high-strength two-component thermosetting resin nanofiber membrane characterized by the diameter of the two-component thermosetting nanofiber being controlled by an electrospinning process.

2. In Paragraph 1, The above-described two-component thermosetting resin composition comprises a single or two or more thermosetting resins selected from the group consisting of urethane resin and epoxy resin, and is a high-strength two-component thermosetting resin nanofiber membrane.

3. In Paragraph 1, A high-strength two-component thermosetting resin nanofiber membrane characterized by having a tensile strength of 6 MPa or more.

4. In Paragraph 1, A high-strength two-component thermosetting resin nanofiber membrane characterized by the diameter of the high-strength two-component thermosetting resin nanofiber being 500 nm to 1000 nm.

5. In Paragraph 1, A high-strength two-component thermosetting resin nanofiber membrane characterized by having a thickness of 15㎛ to 100㎛.

6. A step of preparing an electrospinning solution by homogenizing a two-component thermosetting resin and a solvent; A step of manufacturing a two-component thermosetting resin nanofiber membrane by performing an electrospinning process using the above electrospinning solution by controlling the distance between the nozzle tip and the collection plate of the electrospinning device, the voltage of the electrospinning device, and the injection speed; and A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane, characterized by including a step of post-curing the two-component thermosetting resin nanofiber membrane obtained by the above-described electrospinning process so that it is fully cured by heat treatment.

7. In Paragraph 6, In the step of preparing the above electrospinning solution, A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane characterized by comprising a single or two or more thermosetting resins selected from the group consisting of urethane resin and epoxy resin.

8. In Paragraph 6, In the step of preparing the above electrospinning solution, A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane, characterized in that the mixing weight ratio of the two-component thermosetting resin and the solvent is 60:40 to 95:

5.

9. In Paragraph 6, In the step of manufacturing the above two-component thermosetting resin nanofiber, A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane, characterized by directly irradiating heat onto the spun fibers before they are collected on the collection plate through an accelerated curing device installed between a nozzle tip and a collection plate.

10. In Paragraph 6, In the step of manufacturing the above two-component thermosetting resin nanofiber, A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane, characterized by stretching the extruded fibers by injecting air from the nozzle tip toward the collection plate using an air injection device installed surrounding the nozzle tip.

11. In Paragraph 6, In the step of manufacturing the above two-component thermosetting resin nanofiber, A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane, characterized in that the distance between the nozzle tip and the collector plate of the electrospinning device (TCD, Tip to Collector Distance) is 100 mm to 300 mm.

12. In Paragraph 6, In the step of manufacturing the above two-component thermosetting resin nanofiber, A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane, characterized in that the voltage applied to the electrospinning device is 8 kV to 20 kV.

13. In Paragraph 6, In the step of manufacturing the above two-component thermosetting resin nanofiber, A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane, characterized in that the injection rate of the electrospinning solution is 0.5 ml / h to 2.0 ml / h.

14. In Paragraph 6, In the step of manufacturing the above two-component thermosetting resin nanofiber, A method for manufacturing a high-strength two-component thermosetting resin nanofiber membrane, characterized in that the diameter of the high-strength two-component thermosetting resin nanofiber is 500 nm to 1000 nm.

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