Porous polymer structure by ultrasonic atomization and its manufacturing method

Abstract

The present invention provides a porous polymer structure formed by ultrasonic spraying, in which micro-sized pores are formed inside or on the surface of the polymer structure by ultrasonic spraying, and a method for producing the same.

Description

[Technical Field]

[0001] The present invention relates to a porous polymer structure formed by ultrasonic atomization, in which micro-sized pores are formed inside or on the surface of the polymer structure by ultrasonic atomization, and a method for producing the same. [Background technology]

[0002] Porous structures, taking advantage of their large internal specific surface area, are useful in fields requiring the adsorption and separation of gases and organic solvents, and because they have a porous membrane form that allows fluids to easily pass through, they are also actively used in the field of desalination.

[0003] However, manufacturing a porous structure requires complicated processes, making it difficult to manufacture and apply to a large area. Furthermore, the manufacturing method of a porous structure is limited in the shape that can be manufactured, and there is a limit to controlling the porosity.

[0004] Therefore, through painstaking research and various efforts, the applicant has obtained a porous polymer structure produced by ultrasonic spraying, in which micro-sized pores are formed inside or on the surface of the polymer structure by ultrasonic spraying, and a method for producing the same, thereby completing the present invention. Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, an object of the present invention is to provide an ultrasonically sprayed porous polymer structure in which micro-sized pores are formed inside or on the surface of the polymer structure by an ultrasonic spraying method.

[0006] Another object of the present invention is to provide a method for producing a porous polymer structure by ultrasonic spraying, which comprises atomizing a spray solution into micro-sized droplets, then infiltrating the spray solution into a liquid polymer resin by ultrasonic spraying to form a porous structure, and curing the porous structure to produce a porous polymer structure.

[0007] The problems that the present invention aims to solve are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0008] In order to solve the above problems, according to one aspect of the present invention, The present invention provides a porous polymeric structure formed from ultrasonic spraying, comprising: The porous polymer structure contains micro-sized pores inside or on the surface of the polymer structure, The porous polymer structure having micro-sized pores is formed by ultrasonically spraying a solution to be sprayed, and then the solution is atomized into micro-sized droplets to form a droplet dispersion, which is then infiltrated into a substrate coated with a liquid polymer resin by ultrasonic spraying to form a porous structure. The porous polymer structure is then thermally cured or photocured.

[0009] According to one embodiment of the present invention, the porosity of the porous polymer structure is Specific surface area: 10m 2 / g~1000m 2 / g, The pore size may be in the range of 1 μm to 500 μm.

[0010] According to one embodiment of the present invention, the surface shape of the porous polymer structure includes a sponge shape having pores formed therein, The cross-sectional thickness of the porous polymer structure may be in the range of 10 μm to 5 mm.

[0011] According to an embodiment of the present invention, the spray solution may be a solution containing at least one solvent selected from the group consisting of water, alcohol, ketone, and glycol.

[0012] According to an embodiment of the present invention, the liquid polymer resin may be at least one selected from the group consisting of polydimethylsiloxane (PDMS), polymethylvinylsiloxane (PMVS), polymethylhydrosiloxane (PMHS), polyether modified polydimethylsiloxane, polymethylalkylsiloxane, polyethylene glycol (PEG), polyethylene oxide (PEO), polypropylene glycol (PPG), polypropylene oxide (PPO), urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy methacrylate, trimethylolpropane triacrylate, trimethylolpropane (EO)n triacrylate, trimethylolpropane trimethacrylate, and trimethylolpropane (EO)n trimethacrylate.

[0013] According to an embodiment of the present invention, the substrate may be at least one selected from the group consisting of glass, plastic, porcelain, ceramics, metal, and fiber.

[0014] According to an embodiment of the present invention, the droplet size of the dispersion may be 1 Å to 20 μm.

[0015] According to an embodiment of the present invention, the shape of the porous structure may be changed depending on the amount of the droplet dispersion that is sprayed and penetrates into the liquid polymer resin.

[0016] According to one embodiment of the present invention, the ultrasonic spraying method can control the amount of the droplet dispersion that penetrates into the liquid polymer resin by adjusting the spray conditions, such as the spray distance, spray flow rate, spray time, or spray pressure, thereby adjusting the porosity, surface shape, or cross-sectional thickness of the porous polymer structure.

[0017] According to one embodiment of the present invention, the ultrasonic atomization method includes using an ultrasonic atomizer, The ultrasonic nebulizer may be at least one selected from the group consisting of a mechanical ultrasonic nebulizer, a mesh ultrasonic nebulizer, a piezoelectric ultrasonic nebulizer, a cavitation ultrasonic nebulizer, and a capillary wave ultrasonic nebulizer.

[0018] According to one embodiment of the present invention, the thermal curing may include a step of thermal curing at a temperature of 10°C to 350°C. The photocuring may include a step of photocuring at a temperature of 30°C to 120°C with an intensity of 200mJ to 3000mJ from a UV lamp.

[0019] According to one embodiment of the present invention, the curing agent for the thermal curing is The liquid may contain at least one selected from the group consisting of water, Di-(2,4-dichlorobenzoyl)-peroxide, Dibenzoyl peroxide, Dicumyl peroxide, tert-Butylcumylperoxide, Di-tert-butylperoxide, Isophorone Diisocyanate (IPDI), 4,4'-Diphenylmethane diisocyanate (MDI), Toluene Diisocyanate (TDI), Hexamethylene diisocyanate (HDI), and HDI Built-in.

[0020] According to one embodiment of the present invention, the photo-curing agent is It may contain at least any one selected from Di-(2,4-dichlorobenzoyl)-peroxide, Dibenzoyl peroxide, Dicumyl peroxide, tert-Butylcumylperoxide, Di-tert-butylperoxide, TPO (2,4,6-Trimethylbenzoyl diphenyl phosphine oxide), TPO-L (Ethyl(2,4,6-trimethylbenzoyl)henylphosphinate), BP (Benzophenone), MBP (4-Metylbenzophenone), DEB (4,4’-Bis(diethylamino)benzophenon), BMS (4-Benzoyl-4’-Methyldiphenylsulfide), MBF (Methyl phenlglyoxylate), MBB (Methyl o-benzoylbenzoate), PBZ (4-phenylbenzophenone), BDK (Benzildimethylketal), EHA (2-Ethlhexyl-4-Dimethylaminobenzoate), EPD (Ethyl-4-Dimethylaminobenzoate), 1173 (Hydroxy-2-methylphayl-propane-1-one), 184 (1-Hydroxycyclohexylphenylketon), ITX (Isopropylthioxanthone), DETX (2,4-diethylthioxanthone), 369 (2-Benzyl-2-(dimethylamino)-1-[4-(morpholinyl)phenyl]-1-butanone), 379 (2-Dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)butan-1-one), 819 (Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide), and 1100 (Oligo[2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propanone]).

[0021] According to one embodiment of the present invention, the porous polymer structure prepared by ultrasonic spraying may be used as a separation membrane, a composite material, a support, a soundproofing material, a heat insulating material, or a scaffold.

[0022] According to another aspect of the present invention, The present invention provides a method for producing a porous polymer structure by ultrasonic spraying, comprising: (a) preparing a solution for spraying; (b) preparing a substrate coated with a liquid polymer resin; (c) atomizing the spray solution into micro-sized droplets using an ultrasonic atomizer to produce a droplet dispersion; (d) infiltrating the droplet dispersion into the substrate coated with the liquid polymer resin by ultrasonic spraying to form a porous structure; and (e) heat-curing or photo-curing the porous structure to produce a porous polymer structure; The ultrasonic spraying method is characterized in that the spray amount of the droplet dispersion that penetrates into the liquid polymer resin is controlled by adjusting the spray conditions, such as the spray distance, spray flow rate, spray time, or spray pressure, thereby controlling the porosity, surface shape, or cross-sectional thickness of the porous polymer structure. It is possible to provide a method for producing a porous polymer structure by ultrasonic atomization.

[0023] According to one embodiment of the present invention, the ultrasonic atomization method The spray distance may be in the range of 1 mm to 1 m. The spray flow rate may be in the range of 0.1 mL / min to 200 mL / min. The spray time may be from 5 seconds to 5 hours. The spray pressure may be in the range of 0.1 bar to 20 bar.

[0024] According to one embodiment of the present invention, in the step (a) of preparing a solution to be sprayed, The spray solution may be a solution containing at least one solvent selected from the group consisting of water, alcohol, ketone, and glycol.

[0025] According to one embodiment of the present invention, in the step (b) of preparing a substrate coated with a liquid polymer resin, The liquid polymer resin may be at least one selected from polydimethylsiloxane (PDMS), polymethylvinylsiloxane (PMVS), polymethylhydrosiloxane (PMHS), polyether modified polydimethylsiloxane, polymethylalkylsiloxane, polyethylene glycol (PEG), polyethylene oxide (PEO), polypropylene glycol (PPG), polypropylene oxide (PPO), urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy methacrylate, trimethylolpropane triacrylate, trimethylolpropane (EO)n triacrylate, trimethylolpropane trimethacrylate, and trimethylolpropane (EO)n trimethacrylate.

[0026] According to one embodiment of the present invention, in the step (c) of atomizing the spray solution into micro-sized droplets using an ultrasonic atomizer to prepare a droplet dispersion, The ultrasonic nebulizer may be at least one selected from the group consisting of a mechanical ultrasonic nebulizer, a mesh ultrasonic nebulizer, a piezoelectric ultrasonic nebulizer, a cavitation ultrasonic nebulizer, and a capillary wave ultrasonic nebulizer.

[0027] According to one embodiment of the present invention, in the step (d), the droplet dispersion is permeated into the substrate coated with the liquid polymer resin by an ultrasonic spraying method to form a porous structure, The shape of the porous structure may change depending on the amount of the droplet dispersion that is sprayed and penetrates into the liquid polymer resin.

[0028] According to one embodiment of the present invention, in the step (e) of thermally curing or photocuring the porous structure to prepare a porous polymer structure, The heat curing step includes a step of heat curing at a temperature of 10°C to 350°C, The photocuring may include a step of photocuring at a temperature of 30°C to 120°C with an intensity of 200mJ to 3000mJ from a UV lamp. [Effects of the Invention]

[0029] According to the present invention, an ultrasonically sprayed porous polymer structure is provided in which micro-sized pores are formed inside or on the surface of the polymer structure by ultrasonic spraying, and therefore the structure has excellent physical properties and can be used as a structure for various applications.

[0030] In addition, the present invention provides a method for manufacturing a porous polymer structure by ultrasonic spraying, in which a spray solution is atomized into micro-sized droplets, the spray solution is then impregnated into a liquid polymer resin by ultrasonic spraying to form a porous structure, and the porous structure is cured to manufacture a porous polymer structure.Therefore, the method is applicable to large areas, has excellent process stability, and is economical because of low manufacturing costs.

[0031] It should be understood that the effects of the present invention are not limited to the effects described above, but include any effects that can be inferred from the configuration of the invention described in the detailed description of the present invention or the claims. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a process diagram of a method for manufacturing a porous polymer structure by ultrasonic spraying according to an embodiment of the present invention. [Figure 2] 1A to 1C are schematic diagrams illustrating steps of a method for manufacturing a porous polymer structure by ultrasonic spraying according to an embodiment of the present invention. [Figure 3] 1 is a SEM image showing the surface and cross-sectional shapes of a porous polymer structure produced by a method for manufacturing a porous polymer structure using ultrasonic spraying according to an embodiment of the present invention. [Figure 4] 4A and 4B are optical microscope and SEM images showing the surface and cross-sectional shapes of a porous polymer structure produced by a method for producing a porous polymer structure by ultrasonic spraying according to an embodiment of the present invention. [Figure 5] 4A and 4B are cross-sectional SEM images of porous polymer structures according to ultrasonic spraying times in a method for manufacturing a porous polymer structure by ultrasonic spraying according to an embodiment of the present invention. [Figure 6] FIG. 2 is a pore size distribution diagram of a porous polymer structure according to an embodiment of the present invention, showing the relationship between ultrasonic spraying time and the porous polymer structure manufacturing method. [Figure 7] 4A and 4B are cross-sectional SEM images showing the pore size and cross-sectional shape of a porous polymer structure depending on the ultrasonic spray flow rate in a method for manufacturing a porous polymer structure by ultrasonic spraying according to an embodiment of the present invention. [Figure 8] 4A and 4B are cross-sectional SEM images showing the pore size and cross-sectional shape of a porous polymer structure depending on the ultrasonic spray pressure in a method for manufacturing a porous polymer structure by ultrasonic spraying according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] The advantages and features of the present invention and the manner in which it is achieved will become more apparent from the following detailed description of the preferred embodiments in conjunction with the accompanying drawings.

[0035] However, the present invention is not limited to the following disclosed examples, and may be embodied in various different forms. However, these examples are provided to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims.

[0036] Furthermore, when describing the present invention, if it is determined that related publicly known techniques may obscure the gist of the present invention, detailed description thereof will be omitted.

[0037] The present invention will be described in detail below.

[0038] Porous polymer structures by ultrasonic atomization The present invention provides an ultrasonically sprayed porous polymer structure in which micro-sized pores are formed inside or on the surface of the polymer structure by an ultrasonic spraying method.

[0039] The present invention provides a porous polymeric structure formed from ultrasonic spraying, comprising: The porous polymer structure contains micro-sized pores inside or on the surface of the polymer structure, The porous polymer structure having micro-sized pores may be formed by infiltrating a droplet dispersion obtained by atomizing a spray solution into micro-sized droplets onto a substrate coated with a liquid polymer resin using an ultrasonic spray method to form a porous structure, and then thermally curing or photo-curing the porous structure.

[0040] The present invention provides an ultrasonically sprayed porous polymer structure in which micro-sized pores are formed inside or on the surface of the polymer structure by an ultrasonic spraying method, and therefore has excellent physical properties and can be used as a structure for various applications.

[0041] Porous structures, taking advantage of their large internal specific surface area, are useful in fields requiring the adsorption and separation of gases and organic solvents, and because they have a porous membrane form that allows fluids to easily pass through, they are also actively used in the field of desalination.

[0042] However, manufacturing a porous structure requires complicated processes, making it difficult to manufacture and apply to a large area. Furthermore, the manufacturing method of a porous structure is limited in the shape that can be manufactured, and there is a limit to controlling the porosity.

[0043] Therefore, through painstaking research and various efforts, the applicant has obtained a porous polymer structure produced by ultrasonic spraying, in which micro-sized pores are formed inside or on the surface of the polymer structure by ultrasonic spraying, and a method for producing the same, thereby completing the present invention.

[0044] Here, the porosity of the porous polymer structure is Specific surface area: 10m 2 / g~1000m 2 / g, The pore size may be in the range of 1 μm to 500 μm.

[0045] In this case, the porosity of the porous polymer structure is preferably 20 m2 or less in terms of specific surface area. 2 / g~990m 2 / g, more preferably 30m 2 / g~980m 2 / g.

[0046] The porosity of the porous polymer structure may be such that the pore size is preferably 2 μm to 498 μm, and more preferably 5 μm to 495 μm.

[0047] The surface shape of the porous polymer structure includes a sponge shape having pores formed therein, The cross-sectional thickness of the porous polymer structure may be in the range of 10 μm to 5 mm.

[0048] In this case, the cross-sectional thickness of the porous polymer structure may preferably be in the range of 12 μm to 4.9 mm, and more preferably in the range of 15 μm to 4.8 mm.

[0049] The spray solution may be a solution containing at least one solvent selected from the group consisting of water, alcohol, ketone, and glycol.

[0050] Here, the alcohol may include an alcohol having 1 to 20 carbon atoms.

[0051] The alcohol may also include an amino alcohol having 1 to 20 carbon atoms.

[0052] The ketone may include a ketone having 1 to 10 carbon atoms.

[0053] The glycol may also include glycols having 1 to 20 carbon atoms.

[0054] In this case, the glycol may include any one selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and propylene glycol.

[0055] The substrate may be at least one selected from the group consisting of glass, plastic, porcelain, ceramics, metal, and fiber.

[0056] In addition, the liquid polymer resin may be at least one selected from polydimethylsiloxane (PDMS), polymethylvinylsiloxane (PMVS), polymethylhydrosiloxane (PMHS), polyether modified polydimethylsiloxane, polymethylalkylsiloxane, polyethylene glycol (PEG), polyethylene oxide (PEO), polypropylene glycol (PPG), polypropylene oxide (PPO), urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy methacrylate, trimethylolpropane triacrylate, trimethylolpropane (EO)n triacrylate, trimethylolpropane trimethacrylate, and trimethylolpropane (EO)n trimethacrylate.

[0057] Here, the liquid polymer resin may be a liquid resin that wets the substrate.

[0058] The droplet size of the droplet dispersion may be 1 Å to 20 μm.

[0059] In this case, the droplet size of the droplet dispersion may preferably be 1.2 Å to 19.8 μm, and more preferably 1.5 Å to 19.5 μm.

[0060] Furthermore, the shape of the porous structure may change depending on the amount of the droplet dispersion that is sprayed and penetrates into the liquid polymer resin.

[0061] Here, the shape of the porous structure may be, but is not limited to, a circle, a star, a square, a polygon, or a polygonal column.

[0062] The ultrasonic spraying method can adjust the spraying amount of the droplet dispersion that penetrates into the liquid polymer resin by adjusting the spraying conditions, such as the spraying distance, spray flow rate, spraying time, or spraying pressure, thereby adjusting the porosity, surface shape, or cross-sectional thickness of the porous polymer structure.

[0063] In the present invention, deionized water is atomized using an ultrasonic generator and penetrates into the polymer in the form of a mist. The liquid polymer resin has a higher viscosity than water droplets, so the shape of the sprayed water droplets can be maintained inside the polymer. When the liquid polymer resin is cured by heat or light, a porous structure can be formed.

[0064] At this time, when the liquid polymer in which the water droplets have permeated is heated, the water droplets present inside are evaporated and a polymerization reaction occurs, and hardening can be carried out while the droplets remain.

[0065] Alternatively, the water droplets that penetrate the porous material may evaporate while still interconnected, resulting in a porous network structure with high porosity.

[0066] That is, by simultaneously carrying out phase separation and polymerization reaction due to the solution permeating into the liquid polymer, a porous interconnected network can be formed inside, and the polymer may have a high porosity.

[0067] Therefore, the porous structure produced by the ultrasonic spraying device is uniform and can be produced in a large area through a simple process, and can be used in various industries.

[0068] In addition, the porous structure produced by the ultrasonic spray device is manufactured by spraying a solution that is difficult to mix with the material to be produced into the porous structure, and is characterized by easy manufacturing conditions, being applicable to various materials, and being able to be manufactured into various shapes.

[0069] The porous structure produced by the ultrasonic spraying device can be fabricated by spraying a solution that has been atomized into small droplets using ultrasonic waves or air pressure onto a liquid polymer material, thereby producing a structure having an interconnected pore network inside.

[0070] In addition, it has advantages such as the ability to form structures using various solutions depending on the physical properties of the polymer, the ability to form a pore network in various materials, and the ability to fabricate a desired pore structure depending on the spray conditions, making it useful in industrial fields that require the design of porous structures, such as separation membranes and composite materials.

[0071] In the present invention, the pores can be adjusted to have various sizes and distributions by changing the spraying conditions of the ultrasonic spray.

[0072] Here, the size and distribution of droplets in the ultrasonic spray method can vary depending on the spray distance, spray flow rate, spray pressure, and spray time.

[0073] Specifically, as the spraying time increases, the water droplets that have been repeatedly infiltrated by the ultrasonic spray harden, increasing the pore size, and as the water droplets evaporate as they harden, the liquid polymer also hardens in a swollen state, which can increase the thickness.

[0074] The larger the spray flow rate, the larger the size of the water droplets sprayed by the ultrasonic spray, and the larger the size of the water droplets can penetrate into the liquid polymer.

[0075] In addition, as the injection pressure increases, the ejection speed of the injected water droplets increases, and the depth to which the liquid polymer can penetrate increases, thereby adjusting the depth of pore formation.

[0076] The ultrasonic atomization method includes using an ultrasonic atomizer, The ultrasonic nebulizer may be at least one selected from the group consisting of a mechanical ultrasonic nebulizer, a mesh ultrasonic nebulizer, a piezoelectric ultrasonic nebulizer, a cavitation ultrasonic nebulizer, and a capillary wave ultrasonic nebulizer.

[0077] The thermal curing may include a step of thermal curing at a temperature of 10°C to 350°C, The photocuring may include a step of photocuring at a temperature of 30°C to 120°C with an intensity of 200mJ to 3000mJ from a UV lamp.

[0078] Here, the heat curing may preferably include a step of heat curing at a temperature of 12°C to 330°C, and more preferably may include a step of heat curing at a temperature of 15°C to 310°C.

[0079] The photocuring may preferably include a step of photocuring at a temperature of 32°C to 118°C with a UV lamp intensity of 202 mJ to 2980 mJ, and more preferably at a temperature of 35°C to 115°C with a UV lamp intensity of 205 mJ to 2950 mJ.

[0080] And, as a curing agent for the thermal curing, The liquid may contain at least one selected from the group consisting of water, Di-(2,4-dichlorobenzoyl)-peroxide, Dibenzoyl peroxide, Dicumyl peroxide, tert-Butylcumylperoxide, Di-tert-butylperoxide, Isophorone Diisocyanate (IPDI), 4,4'-Diphenylmethane diisocyanate (MDI), Toluene Diisocyanate (TDI), Hexamethylene diisocyanate (HDI), and HDI Built-in.

[0081] Further, as a curing agent for the photocuring, It may contain at least any one selected from Di-(2,4-dichlorobenzoyl)-peroxide, Dibenzoyl peroxide, Dicumyl peroxide, tert-Butylcumylperoxide, Di-tert-butylperoxide, TPO (2,4,6-Trimethylbenzoyl diphenyl phosphine oxide), TPO-L (Ethyl(2,4,6-trimethylbenzoyl)henylphosphinate), BP (Benzophenone), MBP (4-Metylbenzophenone), DEB (4,4’-Bis(diethylamino)benzophenon), BMS (4-Benzoyl-4’-Methyldiphenylsulfide), MBF (Methyl phenlglyoxylate), MBB (Methyl o-benzoylbenzoate), PBZ (4-phenylbenzophenone), BDK (Benzildimethylketal), EHA (2-Ethlhexyl-4-Dimethylaminobenzoate), EPD (Ethyl-4-Dimethylaminobenzoate), 1173 (Hydroxy-2-methylphayl-propane-1-one), 184 (1-Hydroxycyclohexylphenylketon), ITX (Isopropylthioxanthone), DETX (2,4-diethylthioxanthone), 369 (2-Benzyl-2-(dimethylamino)-1-[4-(morpholinyl)phenyl]-1-butanone), 379 (2-Dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)butan-1-one), 819 (Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide), and 1100 (Oligo[2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propanone]).

[0082] The porous polymer structure prepared by ultrasonic spraying may be used as a separation membrane, a composite material, a support, a soundproofing material, a heat insulating material, or a scaffold.

[0083] Method for manufacturing porous polymer structures by ultrasonic atomization The present invention provides a method for producing a porous polymer structure by ultrasonic spraying, which comprises atomizing a spray solution into micro-sized droplets, then infiltrating the spray solution into a liquid polymer resin by ultrasonic spraying to form a porous structure, and curing the porous structure to produce a porous polymer structure.

[0084] The present invention provides a method for producing a porous polymer structure by ultrasonic spraying, comprising: (a) preparing a solution for spraying; (b) preparing a substrate coated with a liquid polymer resin; (c) atomizing the spray solution into micro-sized droplets using an ultrasonic atomizer to produce a droplet dispersion; (d) infiltrating the droplet dispersion into the substrate coated with the liquid polymer resin by ultrasonic spraying to form a porous structure; and (e) heat-curing or photo-curing the porous structure to produce a porous polymer structure; The ultrasonic spraying method can adjust the spraying conditions, such as spray distance, spray flow rate, spray time, or spray pressure, to control the spray amount of the droplet dispersion that penetrates into the liquid polymer resin, thereby adjusting the porosity, surface shape, or cross-sectional thickness of the porous polymer structure.

[0085] The present invention provides a method for producing a porous polymer structure by ultrasonic spraying, which involves atomizing a spray solution into micro-sized droplets, then infiltrating the spray solution into a liquid polymer resin by ultrasonic spraying to form a porous structure, and curing the porous structure to produce a porous polymer structure.This method is applicable to large areas, has excellent process stability, and is economical because it can be produced at low production costs.

[0086] Here, the ultrasonic spraying method can adjust the spraying conditions, such as spraying distance, spray flow rate, spraying time, or spraying pressure, to control the spray amount of the droplet dispersion that penetrates into the liquid polymer resin, thereby adjusting the porosity, surface shape, or cross-sectional thickness of the porous polymer structure.

[0087] And, the ultrasonic atomization method The spray distance may be in the range of 1 mm to 1 m. The spray flow rate may be in the range of 0.1 mL / min to 200 mL / min. The spray time may be from 5 seconds to 5 hours. The spray pressure may be in the range of 0.1 bar to 20 bar.

[0088] If the spraying distance is outside the above range, the porosity of the porous polymer structure may decrease.

[0089] In this case, the spray distance of the ultrasonic spraying method may preferably be 1.2 mm to 0.98 m, and more preferably 1.5 mm to 0.95 m.

[0090] Furthermore, if the spray flow rate is outside the above range, the porosity of the porous polymer structure may decrease.

[0091] In this case, the spray flow rate of the ultrasonic spray method may be preferably 0.2 mL / min to 198 mL / min, and more preferably 0.32 mL / min to 195 mL / min.

[0092] If the spraying time is outside the above range, the porosity of the porous polymer structure may decrease.

[0093] In this case, the spraying time of the ultrasonic spraying method may preferably be 8 seconds to 4.98 hours, and more preferably 10 seconds to 4.95 hours.

[0094] Furthermore, if the spraying pressure is outside the above range, the porosity of the porous polymer structure may decrease.

[0095] In this case, the spray pressure of the ultrasonic spray method may preferably be 0.12 bar to 19.8 bar, and more preferably 0.15 bar to 19.5 bar.

[0096] In the present invention, deionized water is atomized using an ultrasonic generator and penetrates into the polymer in the form of a mist. The liquid polymer resin has a higher viscosity than water droplets, so the shape of the sprayed water droplets can be maintained inside. When the liquid polymer resin is cured by heat or light, a porous structure can be formed.

[0097] At this time, when the liquid polymer in which the water droplets have permeated is heated, the water droplets present inside are evaporated and a polymerization reaction occurs, allowing hardening to occur while the droplets remain.

[0098] Alternatively, the water droplets that penetrate the porous material may evaporate while still interconnected, resulting in a porous network structure with high porosity.

[0099] That is, by simultaneously carrying out phase separation and polymerization reaction due to the solution permeating into the liquid polymer, a porous interconnected network can be formed inside, and the polymer may have a high porosity.

[0100] Therefore, the method for manufacturing a porous structure using the ultrasonic spraying device is uniform and can be applied to a large area through a simple process, and can be used in various industries.

[0101] In addition, the method for manufacturing a porous structure using the ultrasonic spray device is a method for spraying a solution that is difficult to mix with the material to be used to make the porous structure, and is characterized by easy manufacturing conditions, being applicable to various materials, and being able to manufacture various shapes.

[0102] The method for manufacturing a porous structure using the ultrasonic spray device may enable the fabrication of a structure having an interconnected pore network inside by spraying a solution that has been atomized into small droplets using ultrasonic waves or air pressure onto a polymer material that is in a liquid state.

[0103] In addition, it has advantages such as the ability to form structures using various solutions depending on the physical properties of the polymer, the ability to form a pore network in various materials, and the ability to fabricate a desired pore structure depending on the spray conditions, making it useful in industrial fields that require the design of porous structures, such as separation membranes and composite materials.

[0104] In the present invention, the pores can be adjusted to have various sizes and distributions by changing the spraying conditions of the ultrasonic spray.

[0105] Here, the size and distribution of droplets in the ultrasonic spray method can vary depending on the spray distance, spray flow rate, spray pressure, and spray time.

[0106] Specifically, as the spraying time increases, the water droplets that have been repeatedly infiltrated by the ultrasonic spray gather together, increasing the pore size, and as they harden, the water droplets evaporate and the liquid polymer hardens in a swollen state, which can increase the thickness.

[0107] The larger the spray flow rate, the larger the size of the water droplets sprayed by ultrasonic spraying, and the larger the size of the water droplets can penetrate into the liquid polymer.

[0108] Furthermore, the higher the injection pressure, the faster the ejection speed of the injected water droplets increases, and the deeper the depth that the liquid polymer can penetrate, thereby enabling the depth of pore formation to be adjusted.

[0109] Then, in the step (a) of preparing a solution to be sprayed, The spray solution may be a solution containing at least one solvent selected from the group consisting of water, alcohol, ketone, and glycol.

[0110] Here, the alcohol may include an alcohol having 1 to 20 carbon atoms.

[0111] The alcohol may also include an amino alcohol having 1 to 20 carbon atoms.

[0112] The ketone may include a ketone having 1 to 10 carbon atoms.

[0113] The glycol may also include glycols having 1 to 20 carbon atoms.

[0114] In this case, the glycol may include any one selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and propylene glycol.

[0115] The substrate may be at least one selected from the group consisting of glass, plastic, porcelain, ceramics, metal, and fiber.

[0116] In addition, in the step (b) of preparing a substrate coated with a liquid polymer resin, The liquid polymer resin may be at least one selected from polydimethylsiloxane (PDMS), polymethylvinylsiloxane (PMVS), polymethylhydrosiloxane (PMHS), polyether modified polydimethylsiloxane, polymethylalkylsiloxane, polyethylene glycol (PEG), polyethylene oxide (PEO), polypropylene glycol (PPG), polypropylene oxide (PPO), urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy methacrylate, trimethylolpropane triacrylate, trimethylolpropane (EO)n triacrylate, trimethylolpropane trimethacrylate, and trimethylolpropane (EO)n trimethacrylate.

[0117] Here, the liquid polymer resin may be a liquid resin that wets the substrate.

[0118] In addition, in the step (c) of atomizing the spray solution into micro-sized droplets using an ultrasonic atomizer to produce a droplet dispersion, The ultrasonic nebulizer may be at least one selected from the group consisting of a mechanical ultrasonic nebulizer, a mesh ultrasonic nebulizer, a piezoelectric ultrasonic nebulizer, a cavitation ultrasonic nebulizer, and a capillary wave ultrasonic nebulizer.

[0119] In the step (d), the droplet dispersion is permeated into the substrate coated with the liquid polymer resin by an ultrasonic spray method to form a porous structure. The shape of the porous structure may change depending on the amount of the droplet dispersion that is sprayed and penetrates into the liquid polymer resin.

[0120] Here, the shape of the porous structure may be, but is not limited to, a circle, a star, a square, a polygon, or a polygonal column.

[0121] The ultrasonic spraying method can adjust the spraying amount of the droplet dispersion that penetrates into the liquid polymer resin by adjusting the spraying conditions, such as the spraying distance, spray flow rate, spraying time, or spraying pressure, thereby adjusting the porosity, surface shape, or cross-sectional thickness of the porous polymer structure.

[0122] In addition, in the step (e) of producing a porous polymer structure by thermally curing or photocuring the porous structure, The heat curing step includes a step of heat curing at a temperature of 10°C to 350°C, The photocuring may include a step of photocuring at a temperature of 30°C to 120°C with an intensity of 200mJ to 3000mJ from a UV lamp.

[0123] Here, the heat curing may preferably include a step of heat curing at a temperature of 12°C to 330°C, and more preferably may include a step of heat curing at a temperature of 15°C to 310°C.

[0124] The photocuring may preferably include a step of photocuring at a temperature of 32°C to 118°C with a UV lamp intensity of 202 mJ to 2980 mJ, and more preferably at a temperature of 35°C to 115°C with a UV lamp intensity of 205 mJ to 2950 mJ.

[0125] And, as a curing agent for the thermal curing, The liquid may contain at least one selected from the group consisting of water, Di-(2,4-dichlorobenzoyl)-peroxide, Dibenzoyl peroxide, Dicumyl peroxide, tert-Butylcumylperoxide, Di-tert-butylperoxide, Isophorone Diisocyanate (IPDI), 4,4'-Diphenylmethane diisocyanate (MDI), Toluene Diisocyanate (TDI), Hexamethylene diisocyanate (HDI), and HDI Built-in.

[0126] Further, as a curing agent for the photocuring, It may also contain at least any one selected from Di-(2,4-dichlorobenzoyl)-peroxide, Dibenzoyl peroxide, Dicumyl peroxide, tert-Butylcumylperoxide, Di-tert-butylperoxide, TPO(2,4,6-Trimethylbenzoyl diphenyl phosphine oxide), TPO-L(Ethyl(2,4,6-trimethylbenzoyl)henylphosphinate), BP(Benzophenone), MBP(4-Metylbenzophenone), DEB(4,4’-Bis(diethylamino)benzophenon), BMS(4-Benzoyl-4’-Methyldiphenylsulfide), MBF(Methyl phenlglyoxylate), MBB(Methyl o-benzoylbenzoate), PBZ(4-phenylbenzophenone), BDK(Benzildimethylketal), EHA(2-Ethlhexyl-4-Dimethylaminobenzoate), EPD(Ethyl-4-Dimethylaminobenzoate), 1173(Hydroxy-2-methylphayl-propane-1-one), 184(1-Hydroxycyclohexylphenylketon), ITX(Isopropylthioxanthone), DETX(2,4-diethylthioxanthone), 369(2-Benzyl-2-(dimethylamino)-1-[4-(morpholinyl)phenyl]-1-butanone), 379(2-Dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)butan-1-one), 819(Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide), and 1100(Oligo[2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propanone]).

[0127] FIG. 1 is a flow chart showing a method for manufacturing a porous polymer structure by ultrasonic spraying according to one embodiment of the present invention.

[0128] Referring to FIG. 1, after preparing a solution to be sprayed (S110), a substrate coated with a liquid polymer resin is prepared (S120).

[0129] Thereafter, the spray solution is atomized into micro-sized droplets using an ultrasonic atomizer to prepare a droplet dispersion (S130).

[0130] Thereafter, the droplet dispersion is permeated into the substrate coated with the liquid polymer resin by ultrasonic spraying to form a porous structure (S140).

[0131] Thereafter, the porous structure is thermally or photocured to produce a porous polymer structure (S150).

[0132] The present invention will be described in more detail below with reference to examples. However, the following examples are intended to more specifically explain the present invention, and the scope of the present invention is not limited to the following examples. The following examples can be appropriately modified or changed by those skilled in the art within the scope of the present invention.

[0133] <Example> Example 1 Fabrication of polydimethylsiloxane (PDMS) porous polymer structures by ultrasonic atomization Polydimethylsiloxane (PDMS) porous polymer structures were fabricated using ultrasonic spraying as shown in Figure 2.

[0134] Referring to FIG. 2, 100 g of polydimethylsiloxane (PDMS) and 5 g of Di-(2,4-dichlorobenzoyl)-peroxide were mixed, and the mixed solution was then applied to a glass substrate using a spin coater at 1000 rpm for 3 minutes to prepare a substrate coated with a liquid polymer resin.

[0135] Then, 50 g of deionized water was atomized into micro-sized droplets using a mechanical ultrasonic atomizer to prepare a droplet dispersion as a spray solution.

[0136] Thereafter, the droplet dispersion was ultrasonically sprayed onto the substrate coated with the liquid polymer resin using a mechanical ultrasonic sprayer at a spray distance of 100 mm, a spray flow rate of 1 to 3 mL / min, a spray time of 200 to 600 seconds, and a spray pressure of 1 to 2 bar, to form a porous structure.

[0137] The porous structure was then cured on a hot plate at 180° C. for 1 hour to produce an ultrasonically sprayed polydimethylsiloxane (PDMS) porous polymer structure as shown in FIG. 3a.

[0138] Referring to FIG. 3a, the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1 above had properly formed porosity, with the cross-sectional thickness of the pores being 405 μm.

[0139] FIG. 4 shows optical microscope and SEM images showing the surface and cross-sectional shapes of the porous polymer structure produced by the method for producing a porous polymer structure using ultrasonic spraying according to Example 1.

[0140] Referring to FIG. 4, it was confirmed that the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1 contained micro-sized pores in the optical microscope image of the surface.

[0141] In addition, the cross-sectional thickness of micro-sized pores was confirmed in the cross-sectional SEM image of the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1.

[0142] FIG. 5 shows cross-sectional SEM images of porous polymer structures according to ultrasonic spraying time in the method for manufacturing a porous polymer structure by ultrasonic spraying according to Example 1.

[0143] Referring to FIG. 5, it was confirmed that the cross-sectional thickness of the micro-sized pores in the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1 increased as the ultrasonic spraying time increased from 200 seconds to 600 seconds.

[0144] FIG. 6 shows a pore size distribution diagram of the porous polymer structure according to the ultrasonic spraying time in the method for producing a porous polymer structure by ultrasonic spraying according to Example 1.

[0145] Referring to FIG. 6, it was confirmed that the maximum pore size and average pore size of the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1 increased as the ultrasonic spraying time increased from 200 seconds to 600 seconds.

[0146] FIG. 7 shows cross-sectional SEM images showing the pore size and cross-sectional thickness of the porous polymer structure according to the ultrasonic spray flow rate in the method for manufacturing a porous polymer structure by ultrasonic spraying according to Example 1.

[0147] Referring to FIG. 7, it was confirmed that the pore size and pore depth (cross-sectional thickness of the pores) of the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1 increased as the ultrasonic spray flow rate increased from 1 ml / min to 3 ml / min.

[0148] FIG. 8 shows cross-sectional SEM images showing the pore size and cross-sectional thickness of the porous polymer structure according to the ultrasonic spray pressure in the method for manufacturing a porous polymer structure by ultrasonic spraying according to Example 1.

[0149] Referring to FIG. 8, it was confirmed that the pore size of the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1 increased and the pore depth (cross-sectional thickness of the pore) decreased as the ultrasonic spraying pressure increased from 1 bar to 2 bar.

[0150] <Examples 2 to 10> Production of porous polymer structures by ultrasonic spraying A porous polymer structure was prepared by ultrasonic spraying in the same manner as in Example 1, except that the polymer resin components, the method for preparing the droplet dispersion, the ultrasonic spraying conditions, and the curing conditions shown in Table 1 below were used.

[0151] [Table 1] JPEG2025531364000003.jpg207162

[0152] <Comparative Example 1> Production of porous polymer structure using steam 100 g of polydimethylsiloxane (PDMS) was placed in a high-temperature, high-pressure chamber containing 50 g of deionized water, and steam was generated. The water particles present in the steam permeated the polydimethylsiloxane (PDMS), producing a steam-induced porous polymer structure as shown in Figure 3b.

[0153] Referring to FIG. 3b, it was confirmed that the cross-sectional thickness of the porous polymer structure prepared by steam in Comparative Example 1 was 170 to 270 μm, which was smaller than the cross-sectional thickness of the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1.

[0154] <Comparative Example 2> Production of porous polymer structure by air pressure spray 50 g of deionized water was atomized using air pressure and then sprayed onto 100 g of polydimethylsiloxane (PDMS) through a nozzle, allowing the water particles to penetrate the PDMS, producing a porous polymer structure by air pressure spraying, as shown in Figure 3c.

[0155] Referring to FIG. 3c, it was confirmed that the cross-sectional thickness of the porous polymer structure prepared by pneumatic spraying in Comparative Example 2 was 315 μm, which was smaller than the cross-sectional thickness of the polydimethylsiloxane (PDMS) porous polymer structure prepared by ultrasonic spraying in Example 1.

[0156] So far, specific examples of the porous polymer structure and its manufacturing method by ultrasonic spraying according to the present invention have been described, but it is understood that various modifications are possible within the scope of the present invention.

[0157] Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims set forth below, but also by equivalents to the claims.

[0158] In other words, it should be understood that the above-described embodiments are illustrative and not limiting, and the scope of the present invention is indicated by the claims set forth below rather than by the detailed description, and all modifications and variations that come within the meaning and scope of the claims and their equivalents should be interpreted as being included within the scope of the present invention. [Industrial Applicability]

[0159] The porous polymer structure prepared by ultrasonic spraying of the present invention can be used for a separation membrane, a composite material, a support, a soundproofing material, a heat insulating material, or a scaffold.

Claims

1. 1. A porous polymeric structure formed from ultrasonic spraying, comprising: The porous polymer structure contains micro-sized pores inside or on the surface of the polymer structure, The porous polymer structure having micro-sized pores is formed by atomizing a spray solution into micro-sized droplets, causing a droplet dispersion to penetrate a substrate coated with a liquid polymer resin by an ultrasonic spraying method, thereby forming a porous structure, and then thermally curing or photo-curing the porous structure. Porous polymer structures by ultrasonic atomization.

2. The porosity of the porous polymer structure is Specific surface area: 10 m ２ / g to 1000m ２ / g, The pore size is 1 μm to 500 μm.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

3. The surface shape of the porous polymer structure includes a sponge shape having pores formed therein, The cross-sectional thickness of the porous polymer structure is 10 μm to 5 mm.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

4. The spray solution is a solution containing at least one solvent selected from water, alcohol, ketone, and glycol.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

5. The liquid polymer resin may be polydimethylsiloxane (PDMS), polymethylvinylsiloxane (PMVS), polymethylhydrosiloxane (PMHS), polyether-modified polydimethylsiloxane, polymethylalkylsiloxane (Polymethylalkylsiloxane), polyethylene glycol (PEG), polyethylene oxide (PEO), or polypropylene glycol (Polypropylene glycol). glycol (PPG), polypropylene oxide (PPO), urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy methacrylate, trimethylolpropane triacrylate, trimethylolpropane (EO)n triacrylate, trimethylolpropane trimethacrylate, and trimethylolpropane (EO)n trimethacrylate, 2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

6. The substrate is at least one selected from the group consisting of glass, plastic, porcelain, ceramics, metal, and fiber.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

7. The droplet size of the droplet dispersion is 1 Å to 20 μm.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

8. The shape of the porous structure changes depending on the amount of the droplet dispersion that permeates the liquid polymer resin.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

9. The ultrasonic spraying method is characterized in that the spray amount of the droplet dispersion that penetrates into the liquid polymer resin is controlled by adjusting the spray conditions, such as the spray distance, spray flow rate, spray time, or spray pressure, thereby controlling the porosity, surface shape, or cross-sectional thickness of the porous polymer structure.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

10. The ultrasonic atomization method uses an ultrasonic atomizer, The ultrasonic nebulizer is at least one selected from the group consisting of a mechanical ultrasonic nebulizer, a mesh ultrasonic nebulizer, a piezoelectric ultrasonic nebulizer, a cavitation ultrasonic nebulizer, and a capillary wave ultrasonic nebulizer.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

11. As the curing agent for the thermal curing, The composition contains at least one selected from the group consisting of water, Di-(2,4-dichlorobenzoyl)-peroxide, Dibenzoyl peroxide, Dicumyl peroxide, tert-butylcumylperoxide, Di-tert-butylperoxide, Isophorone Diisocyanate (IPDI), 4,4'-Diphenylmethane Diisocyanate (MDI), Toluene Diisocyanate (TDI), Hexamethylene Diisocyanate (HDI), and HDI Builder.

2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

12. As a curing agent for the photocuring, Di-(2,4-dichlorobenzoyl)-peroxide, Dibenzoyl peroxide, Dicumyl peroxide, tert-butylcumylperoxide, di-tert-butylperoxide, TPO (2,4,6-trimethylbenzoyl diphenyl phosphine oxide), TPO-L (Ethyl (2,4,6-trimethylbenzoyl)henylphosphinate), BP (Benzophenone), MBP (4-Metylbenzoyl enone), DEB (4,4'-Bis(diethylamino)benzophenon), BMS (4-Benzoyl-4'-Methyldiphenylsulfide), MBF (Methyl phenlglyoxylate), MBB (Methyl o-benzoylbenzoate), PBZ (4-phenylbenzophenone), BDK (Benzildimethylketal), EHA (2-Ethlhexyl-4-Dimethylaminobenzoate), EPD (Ethyl-4-Dimethylaminobenzoate), 1173 (Hydroxy-2-methylphayl-propane-1-one), 184 (1-Hydroxycyclohexylphenylke ton), ITX (Isopropylthioxanthone), DETX (2,4-diethylthioxanthone), 369 (2-Benzy the compound contains at least one selected from the group consisting of 1-2-(dimethylamino)-1-[4-(morpholinyl)phenyl]-1-butanone, 379 (2-Dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)butan-1-one), 819 (Bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide), and 1100 (Oligo[2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propanone]), 2. The porous polymer structure produced by ultrasonic spraying according to claim 1.

13. The porous polymer structure produced by ultrasonic spraying according to any one of claims 1 to 12 is used as a separation membrane, a composite material, a support, a soundproofing material, a heat insulating material, or a scaffold. Porous polymer structures by ultrasonic atomization.

14. A method for producing a porous polymer structure by ultrasonic spraying includes: (a) preparing a solution for spraying; (b) providing a substrate coated with a liquid polymer resin; (c) atomizing the spray solution into micro-sized droplets using an ultrasonic atomizer to produce a droplet dispersion; (d) forming a porous structure by infiltrating the droplet dispersion into the substrate coated with the liquid polymer resin by an ultrasonic spraying method; and (e) heat-curing or photo-curing the porous structure to produce a porous polymer structure; The ultrasonic spraying method is characterized in that the spray amount of the droplet dispersion that penetrates into the liquid polymer resin is controlled by adjusting the spray conditions, such as the spray distance, spray flow rate, spray time, or spray pressure, thereby controlling the porosity, surface shape, or cross-sectional thickness of the porous polymer structure. A method for producing porous polymer structures by ultrasonic atomization.

15. The ultrasonic atomization method The spray distance comprises 1 mm to 1 m; The spray flow rate is in the range of 0.1 mL / min to 200 mL / min; The spray time comprises 5 seconds to 5 hours; The spray pressure is in the range of 0.1 bar to 20 bar. The method for producing a porous polymer structure by ultrasonic spraying according to claim 14.

16. In the step (a) of preparing a solution to be sprayed, The spray solution is a solution containing at least one solvent selected from water, alcohol, ketone, and glycol. The method for producing a porous polymer structure by ultrasonic spraying according to claim 14.

17. In the step (b) of preparing a substrate coated with a liquid polymer resin, The liquid polymer resin may be polydimethylsiloxane (PDMS), polymethylvinylsiloxane (PMVS), polymethylhydrosiloxane (PMHS), polyether-modified polydimethylsiloxane, polymethylalkylsiloxane (Polymethylalkylsiloxane), polyethylene glycol (PEG), polyethylene oxide (PEO), or polypropylene glycol (Polypropylene glycol). glycol (PPG), polypropylene oxide (PPO), urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy methacrylate, trimethylolpropane triacrylate, trimethylolpropane (EO)n triacrylate, trimethylolpropane trimethacrylate, and trimethylolpropane (EO)n trimethacrylate, The method for producing a porous polymer structure by ultrasonic spraying according to claim 14.

18. In the step (c) of atomizing the spray solution into micro-sized droplets using an ultrasonic atomizer to produce a droplet dispersion, The ultrasonic nebulizer is at least one selected from the group consisting of a mechanical ultrasonic nebulizer, a mesh ultrasonic nebulizer, a piezoelectric ultrasonic nebulizer, a cavitation ultrasonic nebulizer, and a capillary wave ultrasonic nebulizer. The method for producing a porous polymer structure by ultrasonic spraying according to claim 14.

19. In the step (d), the droplet dispersion is permeated into the substrate coated with the liquid polymer resin by an ultrasonic spraying method to form a porous structure. The shape of the porous structure changes depending on the amount of the droplet dispersion that permeates the liquid polymer resin. The method for producing a porous polymer structure by ultrasonic spraying according to claim 14.

20. In the step (e) of producing a porous polymer structure by thermally curing or photocuring the porous structure, The heat curing step includes a step of heat curing at a temperature of 10°C to 350°C, The photo-curing step includes a step of photo-curing at a temperature of 30°C to 120°C with an intensity of 200mJ to 3000mJ from a UV lamp. The method for producing a porous polymer structure by ultrasonic spraying according to claim 14.

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