JP2010013612A - Method of producing porous component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce a porous component having pores communicating with each other via a nanomicron order pore size. <P>SOLUTION: A method of producing a porous component includes a discharging step of discharging a first material solution 300 into a space, an electrifying step of electrifying the first material solution 300, an induction step of inducing to a predetermined place a nanofiber 301 produced by electrostatic explosion of the material solution 300, a deposition step of forming a deposition product 142 by receiving the nanofiber 301 for depositing the nanofiber onto a component for deposition 101, an impregnating step of impregnating the deposition product 142 with a second material solution 310, a solidifying step of forming an intermediate member 143 by solidifying the second material solution 310, and a removing step of removing from the intermediate component 143 the deposition product 142 by dissolving the deposition with a solvent. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a porous member, and more particularly to a method for producing a porous member having nano-order pore diameters and three-dimensionally communicating pores.

Conventionally, various methods for producing a porous member have been proposed. For example, Patent Document 1 discloses a method for producing a porous member made of a polyester-based thermoplastic resin. Specifically, from the mixture obtained by mixing a thermoplastic resin, a water-soluble foam-forming material, and a water-soluble polymer compound acting as a lubricant under heating, the water-soluble foam-forming material and the water-soluble The polymer compound is extracted and removed with water to produce a porous member having a three-dimensional open cell structure.
JP 2003-342410 A

  However, when bubbles are formed in a thermoplastic resin, it is difficult to produce a porous member having a bubble diameter of 50 μm or more and having fine pores smaller than that. Moreover, it has been further difficult to produce a porous member having a pore size of nano-order and having continuous pores.

  This invention is made | formed in view of the said subject, and aims at provision of the manufacturing method of a porous member provided with the hole which is a nano-order hole diameter and is connected in three dimensions.

  In order to solve the above-mentioned problems, a porous member manufacturing method according to the present invention includes an outflow step of flowing a first raw material liquid that is a raw material of nanofibers into a space, and a charging step of charging the first raw material liquid. An attracting process for attracting nanofibers produced by electrostatic explosion of the raw material liquid to a predetermined place; and receiving the nanofibers attracted by the attracting process and depositing them on a deposition target member to form a deposit A depositing step, an impregnation step of impregnating the formed deposit with a second raw material liquid that is a raw material of the porous member, and an intermediate member is formed by solidifying the second raw material liquid impregnated in the deposit It includes a solidifying step and a removing step of removing the deposit from the intermediate member by dissolving it with a solvent.

  Thereby, it becomes possible to manufacture a porous member having pores with a nano-order pore diameter and three-dimensionally communicating pores.

Next, an embodiment according to the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view schematically showing a porous member manufacturing apparatus according to an embodiment of the present invention.

  As shown in the figure, the porous member manufacturing apparatus 100 includes a discharge means 200, an attracting means 110, a deposition target member 101, an impregnation means 120, and a removal means 130.

  The discharge means 200 is a unit that can discharge the charged first raw material liquid 300 and the manufactured nanofiber 301 on a gas flow. The discharge means 201, the charging means 202, the wind tunnel body 209, the gas A flow generating means 203 and a guide body 206 are provided.

  Here, the raw material liquid for manufacturing the nanofiber is referred to as a first raw material liquid 300, and the manufactured nanofiber is referred to as a nanofiber 301. Since it changes to the nanofiber 301 during electrostatic explosion, the boundary between the first raw material liquid 300 and the nanofiber 301 is ambiguous and cannot be clearly distinguished.

FIG. 2 is a cross-sectional view showing the discharging means.
FIG. 3 is a perspective view showing the discharging means.

  As shown in these drawings, the outflow means 201 is a device that causes the first raw material liquid 300 to flow out into the space. In the present embodiment, the first raw material liquid 300 is caused to flow out radially by centrifugal force, and the wind tunnel body 209 is a device that causes the raw material liquid to flow out into the 209 inclusion. The outflow means 201 includes an outflow body 211, a rotating shaft body 212, and a motor 213.

  The outflow body 211 is a device that causes the first raw material liquid 300 to flow out into the space. In the case of the present embodiment, the outflow body 211 is a container that can cause the first raw material liquid 300 to flow out into the space by centrifugal force due to its rotation while the first raw material liquid 300 is injected inward. The cylindrical wall is closed at one end, and a large number of outflow holes 216 are provided on the peripheral wall. The outflow body 211 is formed of a conductor in order to give electric charge to the first raw material liquid 300 to be stored. The outflow body 211 is rotatably supported by a bearing 215 provided on a support (not shown).

  Specifically, it is preferable that the diameter of the outflow body 211 is adopted from a range of 10 mm or more and 300 mm or less. This is because if it is too large, it will be difficult to concentrate the first raw material liquid 300 and the nanofibers 301 by the gas flow described later, and if the weight balance is slightly deviated, such as the rotational axis of the effluent 211 is decentered. This is because a large vibration is generated, and a structure that firmly supports the outflow body 211 is required to suppress the vibration. On the other hand, if it is too small, the rotation for causing the first raw material liquid 300 to flow out by centrifugal force must be increased, which causes problems such as load and vibration of the drive source. Furthermore, it is preferable to employ the diameter of the outflow body 211 from the range of 20 mm or more and 100 mm or less.

  In addition, the shape of the outflow hole 216 is preferably circular, and the diameter thereof is preferably from about 0.01 mm to 3 mm, although it depends on the thickness of the outflow body 211. This is because if the outflow hole 216 is too small, it will be difficult to cause the first raw material liquid 300 to flow out of the outflow body 211, and if it is too large, the first raw material that flows out from one outflow hole 216 will be difficult. The amount of the liquid 300 per unit time becomes too large (that is, the thickness of the line formed by the flowing out first raw material liquid 300 becomes too thick), and it becomes difficult to manufacture the nanofiber 301 having a desired diameter. Because.

  The shape of the outflow body 211 is not limited to a cylindrical shape, and may be a polygonal cylindrical shape having a polygonal cross section or a conical shape. Any shape that allows the first raw material liquid 300 to flow out of the outflow hole 216 by centrifugal force by rotating the outflow hole 216 may be used. Further, the shape of the outflow hole 216 is not limited to a circular shape, and may be a polygonal shape or a star shape.

  The rotating shaft body 212 is a shaft body for transmitting the driving force for rotating the outflow body 211 and causing the first raw material liquid 300 to flow out by centrifugal force, and from the other end of the outflow body 211 to the inside of the outflow body 211. It is a rod-shaped body that is inserted through the end portion and joined to the closed portion and one end portion of the outflow body 211. The other end is joined to the rotating shaft of the motor 213.

  The motor 213 is a device that applies a rotational driving force to the outflow body 211 via the rotating shaft body 212 in order to cause the first raw material liquid 300 to flow out from the outflow hole 216 by centrifugal force. The rotational speed of the outflow body 211 is within a range of several rpm or more and 10,000 rpm or less depending on the diameter of the outflow hole 216, the viscosity of the first raw material liquid 300 to be used, the type of polymer substance in the raw material liquid, and the like. Preferably, when the motor 213 and the outflow body 211 are in direct motion as in the present embodiment, the rotational speed of the motor 213 coincides with the rotational speed of the outflow body 211.

  The charging unit 202 is a device that charges the first raw material liquid 300 by applying a charge. In the present embodiment, the charging unit 202 includes an induction electrode 221, an induction power source 222, and a ground unit 223. In addition, the outflow body 211 also functions as a part of the charging means 202.

  The induction electrode 221 is a member for inducing electric charge to the outflow body 211 that is arranged in the vicinity and grounded when the induction electrode 221 has a high voltage with respect to the ground, and is disposed so as to surround the front end portion of the outflow body 211. It is an annular member. The induction electrode 221 also functions as a wind tunnel body 209 that guides the gas flow from the gas flow generation means 203 to the guide body 206.

  Although the size of the induction electrode 221 needs to be larger than the diameter of the outflow body 211, it is preferable that the diameter is adopted from a range of 200 mm or more and 800 mm or less.

  The induction power supply 222 is a power supply that can apply a high voltage to the induction electrode 221. In general, the induction power supply 222 is preferably a DC power supply. In particular, a direct-current power supply is preferable when the charged polarity of the nanofiber 301 to be generated is not affected, or when the charged nanofiber 301 is collected and collected on the electrode. In addition, when the induction power supply 222 is a DC power supply, the voltage applied by the induction power supply 222 to the induction electrode 221 is preferably set from a value in the range of 10 KV or more and 200 KV or less. In particular, the electric field strength between the effluent 211 and the induction electrode is important, and it is preferable to arrange the applied voltage and the induction electrode 221 so that the electric field strength is 1 KV / cm or more. The shape of the induction electrode 221 is not limited to an annular shape, and may be a polygonal annular member having a polygonal shape.

  The grounding means 223 is a member that is electrically connected to the outflow body 211 and can maintain the outflow body 211 at the ground potential. One end of the grounding means 223 functions as a brush so that the electrical connection state can be maintained even when the outflow body 211 is in a rotating state, and the other end is connected to the ground.

  If an induction method is employed for the charging means 202 as in the present embodiment, it is possible to apply a charge to the first raw material liquid 300 while maintaining the effluent 211 at the ground potential. If the outflow body 211 is in a ground potential state, it is not necessary to electrically insulate members such as the rotating shaft body 212 and the motor 213 connected to the outflow body 211 from the outflow body 211, and the outflow unit 201 has a simple structure. Can be adopted, which is preferable. In the embodiment, the induction electrode 221 itself has a high voltage with respect to the ground, but the polarity of the induction power supply 222 may be reversed so as to be a low voltage. By doing so, the first raw material liquid 300 flowing out from the outflow hole 216 has a positive charge.

  In addition, as the charging unit 202, a charge may be applied to the first raw material liquid 300 by connecting a power source to the outflow body 211, maintaining the outflow body 211 at a high voltage, and grounding the induction electrode 221. In addition, the outflow body 211 is formed of an insulator, and an electrode that directly contacts the first raw material liquid 300 stored in the outflow body 211 is disposed inside the outflow body 211, and the first raw material liquid 300 is formed using the electrode. It may be one that imparts a charge.

  The gas flow generating means 203 is a device that generates a gas flow for changing the flight direction of the first raw material liquid 300 flowing out from the outflow body 211 to the direction guided by the guide body 206. The gas flow generation means 203 is provided on the back of the motor 213 and generates a gas flow from the motor 213 toward the tip of the effluent 211. The gas flow generating means 203 generates wind force that can change the first raw material liquid 300 in the axial direction until the first raw material liquid 300 flowing out in the radial direction from the outlet body 211 reaches the induction electrode 221. It has become something that can be. In FIG. 2, the gas flow is indicated by arrows. In the case of the present embodiment, a blower including an axial fan that forcibly blows the atmosphere around the discharge unit 200 is employed as the gas flow generation unit 203.

  Note that the gas flow generating means 203 may be constituted by another blower such as a sirocco fan. Further, the direction of the first raw material liquid 300 that has flowed out by introducing the high-pressure gas may be changed. Further, a gas flow may be generated inside the guide body 206 by the suction means 102 or the like. In this case, the gas flow generating means 203 does not have a device that actively generates a gas flow. However, in the case of the present invention, the gas flow is generated when the gas flow is generated inside the guide body 206. It is assumed that the means 203 exists. In addition, there is a gas flow generating means in which a gas flow is generated inward of the wind tunnel body 209 and the guide body 206 by suction by the suction means 102 without the gas flow generating means 203. It shall be. Further, when a gas flow is generated inside the wind tunnel body 209 or the guide body 206 by suction by the suction means 102 without the gas flow generation means 203, the suction means 102 functions as the gas flow generation means. It is assumed that

  The wind tunnel body 209 is a conduit that guides the gas flow generated by the gas flow generation means 203 to the vicinity of the outflow body 211. The gas flow guided by the wind tunnel body 209 intersects the first raw material liquid 300 that has flowed out from the outflow body 211, and changes the flight direction of the first raw material liquid 300.

  Furthermore, the discharge unit 200 includes a gas flow control unit 204 and a heating unit 205.

  The gas flow control means 204 has a function of controlling the gas flow so that the gas flow generated by the gas flow generation means 203 does not hit the outflow hole 216. In this embodiment, as the gas flow control means 204, An air passage body that guides the gas flow so as to flow in a predetermined region is employed. Since the gas flow does not directly hit the outflow hole 216 by the gas flow control means 204, it is possible to prevent the first raw material liquid 300 flowing out from the outflow hole 216 from evaporating early and closing the outflow hole 216 as much as possible. The first raw material liquid 300 can be kept flowing out stably. The gas flow control means 204 may be a wall-shaped windbreak wall that is arranged on the windward side of the outflow hole 216 and prevents the gas flow from reaching the vicinity of the outflow hole 216.

  The heating unit 205 is a heating source that heats the gas constituting the gas flow generated by the gas flow generation unit 203. In the case of the present embodiment, the heating means 205 is an annular heater arranged inside the guide body 206 and can heat the gas passing through the heating means 205. By heating the gas flow with the heating means 205, the first raw material liquid 300 flowing out into the space is accelerated in evaporation, and nanofibers can be efficiently manufactured.

  The guide body 206 is a cylindrical body that forms a wind tunnel for guiding the manufactured nanofiber 301 to a predetermined place.

  A gap 208 is provided between the guide body 206 and the induction electrode 221. By providing the gap, a venturi effect is generated, the flow rate of the gas flow inside the guide body 206 is increased, and the nanofiber 301 can be prevented from adhering to the inner wall of the guide body 206.

  The attracting means 110 (see FIG. 1) is a device for collecting the nanofibers 301 emitted from the guide body 206, and includes an attracting electrode 112, an attracting power source 113, and an attracting means 102.

  The attracting electrode 112 is a member that attracts the charged nanofibers 301 by an electric field (electric field), and is a rectangular plate-like electrode. Moreover, it has many holes through which the gas flow can pass.

  The attraction power source 113 is a power source for applying a potential to the attraction electrode 112, and a DC power source is employed in the present embodiment.

  The suction means 102 is a device that is disposed behind the attracting electrode 112 and forcibly sucks the gas flow that is separated from the nanofiber 301 and flows out through the attracting electrode 112. In the present embodiment, a blower such as a sirocco fan or an axial fan is employed as the suction unit 102.

  The deposition target member 101 is a member on which the nanofibers 301 manufactured and flying by electrostatic explosion are deposited, and is a base member on which the deposited body 142 is formed. The deposition target member 101 is a thin and flexible long sheet-like member made of a material that can be easily separated from the deposited nanofiber 301 and the like. Specifically, as the deposition target member 101, a long cloth made of aramid fibers can be exemplified. Furthermore, it is preferable to perform a Teflon (registered trademark) coating on the surface of the deposition target member 101 because the peelability when the deposited nanofibers 301 are peeled off from the deposition target member 101 is improved. The deposition target member 101 has a mesh structure capable of depositing the nanofibers 301 and capable of passing a gas flow.

  The impregnation means 120 is an apparatus that forms the intermediate member 143 by impregnating the deposited body 142 formed on the deposition target member 101 with the second raw material liquid 310 that is the raw material of the porous member 144. In the case of the present embodiment, the impregnation means 120 is an apparatus that can apply the second raw material liquid 310 to the deposit 142.

  The removing unit 130 is an apparatus that removes the deposit 142 from the intermediate member 143 by dissolving it with a solvent. In the case of the present embodiment, the removing means 130 has a storage tank 131 that stores the solvent, a roller 133 that forms a track for immersing the intermediate member 143 in the solvent, and an intermediate member 143 that is immersed in the solvent. And an ultrasonic generator 132 for adding sonic vibration.

  Next, the manufacturing method of the porous member 144 using the porous member manufacturing apparatus 100 of the said structure is demonstrated.

  First, the second raw material liquid 310 is applied to the deposition target member 101 using the same coating apparatus 121 as the impregnation means 120 to form the base 141 on the surface of the deposition target member 101 (undercoating step). The deposition target member 101 is slowly moving in the direction from the discharge means 200 toward the removal means 130.

  As described above, the second raw material liquid 310 is applied to the surface of the deposition target member 101 before the nanofiber 301 is deposited, and the base 141 is formed, so that the nanofiber 301 is exposed on the surface of the intermediate member 143 described later. There is nothing to do. Therefore, it is possible to manufacture the porous member 144 having no holes or grooves on the surface.

  Next, the nanofibers 301 are discharged from the discharge means 200 to the deposition target member 101, and the nanofibers 301 are deposited on the deposition target member 101 undercoated with the second raw material liquid 310.

Here, a method of discharging the nanofiber 301 will be described.
First, a gas flow is generated inside the guide body 206 and the wind tunnel body 209 by the gas flow generation means 203. On the other hand, the gas flow generated in the guide body 206 is sucked by the suction means 102. Since the pressure inside the guide body 206 is lower than the outside of the guide body 206 due to the gas flow passing through the guide body 206, the atmosphere outside the guide body 206 from the gap 208 (in this embodiment) Air flows in. This is the so-called Venturi effect.

  Next, the first raw material liquid 300 is supplied to the outflow body 211 of the outflow means 201. The first raw material liquid 300 is separately stored in a tank (not shown), passes through a supply path 217 (see FIG. 2), and is supplied into the effluent 211 from the other end of the effluent 211.

  Next, while supplying electric charge to the first raw material liquid 300 stored in the effluent 211 by the induction power source 222 (charging process), the effluent 211 was rotated by the motor 213 and charged from the outflow hole 216 by centrifugal force. The first raw material liquid 300 flows out (outflow process).

  The first raw material liquid 300 that has flowed radially in the radial direction of the outflow body 211 is changed in flight direction by the gas flow and is guided by the wind tunnel body 209 in the gas flow. The first raw material liquid 300 is conveyed to the guide body 206 while manufacturing the nanofiber 301 by the electrostatic explosion (nanofiber manufacturing process). In addition, the gas flow is heated by the heating means 205, and heat is applied to the first raw material liquid 300 to promote the evaporation of the solvent while guiding the flight of the first raw material liquid 300.

  Here, since air flows in from the gap 208 disposed at the end of the guide body 206, the nanofiber 301 is transported while being pressed in the axial direction of the guide body 206 (conveying step). Therefore, the nanofiber 301 is guided along the axis of the guide body 206 without adhering to the inner wall of the guide body 206.

  In this state, the attracting electrode 112 disposed in the opening of the guide body 206 is charged with a polarity opposite to the charged polarity of the nanofiber 301, and therefore attracts the nanofiber 301. Further, since the gas flow is sucked by the suction means 102, the nanofiber 301 is attracted and deposited on the deposition target member 101 (attraction process, deposition process). Then, a deposit 142 is formed on the deposition target member 101.

  Here, as the polymer material constituting the nanofiber 301 and the porous member 144, polypropylene, polyethylene, polystyrene, polyethylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, poly-m-phenylene terephthalate, poly-p -Phenylene isophthalate, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinyl chloride, polyvinylidene chloride-acrylate copolymer, polyacrylonitrile, polyacrylonitrile-methacrylate copolymer, polycarbonate, polyarylate, polyester Carbonate, polyamide, aramid, polyimide, polycaprolactone, polylactic acid, polyglycolic acid, collagen, polyhydroxy Acid, polyvinyl acetate, polypeptides, and the like, and copolymers can be exemplified. Moreover, the kind selected from the above may be used, and a plurality of kinds may be mixed. Note that the above is an example, and the present invention is not limited to the above polymer substance.

  However, the polymer material constituting the nanofiber 301 is different from the polymer material constituting the porous member 144. Specifically, when the solution capable of dissolving the polymer material constituting the nanofiber 301 is A, the polymer material constituting the porous member 144 is hardly soluble in the solution A, or It must have the property of not dissolving.

  Examples of the solvent used for the first raw material liquid 300, the solvent used for the second raw material liquid 310, and the solution used for the removing means 130 include methanol, ethanol, 1-propanol, 2-propanol, hexafluoroisopropanol, and tetraethylene. Glycol, triethylene glycol, dibenzyl alcohol, 1,3-dioxolane, 1,4-dioxane, methyl ethyl ketone, methyl isobutyl ketone, methyl-n-hexyl ketone, methyl-n-propyl ketone, diisopropyl ketone, diisobutyl ketone, acetone, Hexafluoroacetone, phenol, formic acid, methyl formate, ethyl formate, propyl formate, methyl benzoate, ethyl benzoate, propyl benzoate, methyl acetate, ethyl acetate, propyl acetate, dimethyl phthalate, diethyl phthalate , Dipropyl phthalate, methyl chloride, ethyl chloride, methylene chloride, chloroform, o-chlorotoluene, p-chlorotoluene, chloroform, carbon tetrachloride, 1,1-dichloroethane, 1,2-dichloroethane, trichloroethane, dichloropropane, dibromo Ethane, dibromopropane, methyl bromide, ethyl bromide, propyl bromide, acetic acid, benzene, toluene, hexane, cyclohexane, cyclohexanone, cyclopentane, o-xylene, p-xylene, m-xylene, acetonitrile, tetrahydrofuran, N, Examples thereof include N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, pyridine, water and the like. Moreover, the kind selected from the above may be used, and a plurality of kinds may be mixed. In addition, the above is an illustration and this invention is not limited to the said solvent.

  Next, the deposit 142 is impregnated with the second raw material liquid 310 (impregnation step). In the case of the present embodiment, in the impregnation step, the deposit 142 is impregnated with the second raw material liquid 310 by applying the second raw material liquid 310 to the deposit 142 using the impregnation means 120. At this stage, the base 141 and the impregnated second raw material liquid 310 are integrated.

  In addition, as shown in FIG. 4, the deposition material 142 may be impregnated with the second raw material liquid 310 by immersing the deposition material 142 in the second raw material liquid 310.

  Next, the impregnated second raw material liquid 310 is solidified to form the intermediate member 143 (solidification step). The second raw material liquid 310 may be solidified by standing, but in the present embodiment, the second raw material liquid 310 is forcibly solidified by the solidifying means 122 to form the intermediate member 143.

  Here, the solidification means 122 is, for example, a dryer that solidifies the second raw material liquid 310 by irradiating hot air, a device that solidifies the second raw material liquid 310 by applying light such as infrared rays, and an electric heater. And the like to be solidified.

  Next, the deposit 142 is removed from the intermediate member 143 (removal process). That is, the nanofiber 301 is removed from the intermediate member 143. In this embodiment, the intermediate member 143 is immersed in a solvent whose temperature is adjusted by a heater, and ultrasonic waves are applied to the intermediate member 143 by the ultrasonic generator 132 to remove the deposit 142 from the intermediate member 143. is doing.

  In this way, the porous member 144 is manufactured. In this porous member 144, an intermediate member 143 is formed by impregnating the solid body 142 formed by three-dimensionally entanglement of the nanofibers 301 with the second raw material liquid 310 and solidifying the intermediate body 143. 142 is removed and manufactured. Therefore, the porous member 144 has pores in a state where the pore diameter is nano-order and entangled three-dimensionally. Further, the pores are continuous, and the porous member 144 is continuous porous.

Next, another deposition process will be described.
FIG. 5 is a perspective view showing a discharge means, an attracting means (charging means), and a deposition target member used in another deposition process.

  The outflow means 201 constituting the discharge means 200 includes an outflow body 211 in which a plurality of fixed nozzles are arranged obliquely. The nozzle is connected to a supply path 217 to which the first raw material liquid 300 is supplied, and can eject the first raw material liquid 300 by pressure. The outflow body 211 is formed of a conductor and is grounded. Therefore, the outflow body 211 also functions as the charging means 202.

  Hereinafter, an aspect of the apparatus as the attracting means 110 will be described. In the present embodiment, the following apparatus also functions as the charging means 202 at the same time.

  The attracting means 110 includes a plurality of conductive cylinders 117 arranged on the circumference and an attracting electrode 112.

  The conductive cylinder 117 is capable of rotating about its axis, and can revolve on the circumference of the circle. The revolution of the conductive cylinder 117 is performed by a driving source (not shown).

  The attracting electrode 112 is disposed at a position facing the outflow body 211 and is disposed so as to contact the conductive cylinder 117 from the inside of the conductive cylinder 117. Thus, the conductive cylinder 117 in contact with the attracting electrode 112 functions only as the attracting electrode 112 at a position facing the outflow body 211 due to revolution. Therefore, even when the diameter of the rotating body is large, it is possible to avoid the formation of an electric field in an unnecessary portion, and it is possible to attract the nanofiber 301 to the necessary portion.

  Further, the attracting electrode 112 and the conductive cylinder 117 in contact therewith also function as the induction electrode 221. That is, a high voltage is applied between the outflow body 211 that is the ground potential and the induction electrode 112 and the like by the induction power source 113 (induction power source 222). Accordingly, an electric charge is induced in the effluent 211, and the first raw material liquid 300 is charged by the electric charge.

  The deposition target member 101 is disposed on the circumference where the conductive cylinder 117 is disposed, and the deposition target member 101 revolves according to the revolution of the conductive cylinder 117. Further, the deposition target member 101 is disposed on the inner side of the circumference where the conductive cylinder 117 is disposed, is synchronized with the revolution of the conductive cylinder 117, and revolves around the same position as the revolution axis of the conductive cylinder 117. And is collected by a collecting roll 119 that revolves in the same manner.

As described above, the deposition target member 101 can be revolved at high speed.
In the deposition process, the deposition target member 101 is moved at a speed equivalent to or faster than the arrival speed of the nanofiber 301 by revolving the conductive cylinder 117 and the deposition target member 101 at a high speed. By depositing the nanofibers 301 in such a state, as shown in FIG. 6, the nanofibers 301 are deposited along the revolution direction (arrows in the figure), and the deposited body 142 having the orientation can be manufactured. It becomes possible.

  Here, the arrival speed of the nanofiber 301 is a length per unit time at which the nanofiber 301 manufactured in the space reaches the deposition target member 101. For example, in the case where a nanofiber 301 having a length of 10 cm flies perpendicularly to the deposition target member 101, after one end of the nanofiber 301 reaches the deposition target member 101, the other end of the nanofiber 301 arrives. When the time until is 1 second, the arrival speed is 10 cm / second.

  Then, after the deposited body 142 is impregnated with the second raw material liquid 310 and the second raw material liquid 310 is solidified to produce the intermediate member 143, the accumulated body 142 is removed, and then the holes disposed along the same direction are removed. It becomes possible to manufacture the porous member 144 provided with.

  FIG. 6 is a diagram schematically showing the deposited body 142 having orientation, and does not show an actual state.

Next, examples of the present invention will be described.
The following experiment was conducted.

The first raw material liquid was a 10% by weight aqueous solution of PVA (polyvinyl alcohol).
As the second raw material liquid, PMMA (methyl methacrylate resin) was dissolved in methyl ethyl ketone as a solvent to form a 5% solution.

  The first raw material liquid was charged at a voltage of 60 kV, and the motor 213 was rotated at 1500 rpm to flow out from the outflow hole having a hole diameter of 0.3 mm with a centrifugal force to manufacture a nanofiber.

  The nanofibers were deposited for 5 minutes to produce a sheet-like deposit having a thickness of 20 μm. The fiber diameter of the nanofiber was 500 nm to 1500 nm.

Thereafter, the deposited material was impregnated with the second raw material liquid to produce an intermediate member.
Finally, the intermediate member was immersed in water and ultrasonic waves were applied for 180 minutes.

As a result, the porous member shown in FIG. 7 was manufactured.
The diameters of the holes and grooves of the porous member were 400 nm to 1000 nm.

  Moreover, as shown in FIG. 7, the hole was a long hole, and was in a state of being entangled three-dimensionally and communicating with each other.

  The present invention can be applied to the production of porous members such as filters and catalyst supports.

It is sectional drawing which shows typically the porous member manufacturing apparatus which is embodiment of this invention. It is sectional drawing which shows a discharge | release means. It is a perspective view which shows discharge | release means. It is sectional drawing which shows typically the porous member manufacturing apparatus which is other embodiment of this invention. FIG. 5 is a perspective view showing a discharge means, an attracting means (charging means), and a deposition target member used in another deposition process. It is a perspective view which shows the deposit body with orientation. It is an electron micrograph which shows the cross section of a porous member in perspective.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Porous member manufacturing apparatus 101 Deposition object member 102 Attracting means 110 Attracting means 112 Attracting electrode 113 Attracting power source 117 Conductive cylinder 118 Supply roll 119 Recovery roll 120 Impregnation means 121 Coating apparatus 122 Solidifying means 130 Removing means 131 Reservoir 132 Ultrasonic wave generation Device 133 Roller 141 Base 142 Deposited body 143 Intermediate member 144 Porous member 200 Discharge means 201 Outflow means 202 Charging means 203 Gas flow generation means 204 Gas flow control means 205 Heating means 206 Guide body 208 Clearance 209 Wind tunnel body 211 Outflow body 212 Rotation Shaft body 213 Motor 215 Bearing 216 Outflow hole 217 Supply path 221 Induction electrode 222 Induction power source 223 Grounding means 300 First raw material liquid 301 Nanofiber 310 Second raw material liquid

Claims (7)

An outflow process for flowing out the first raw material liquid, which is a raw material of the nanofiber, into the space;
A charging step of charging the first raw material liquid;
An attracting step for attracting nanofibers produced by electrostatic explosion of the raw material liquid to a predetermined place;
Receiving the nanofibers attracted by the attracting step and depositing the nanofibers on the deposition target member to form a deposit;
An impregnation step of impregnating the formed deposited body with a second raw material liquid that is a raw material of the porous member;
A solidification step of solidifying the second raw material liquid impregnated in the deposited body to form an intermediate member;
And a removing step of removing the deposit from the intermediate member by dissolving it with a solvent. further,
The porous member manufacturing method according to claim 1, further comprising an application step of applying a second raw material liquid to the surface of the deposition target member before nanofibers are deposited.   The porous member manufacturing method according to claim 1, wherein in the removing step, the intermediate member is immersed in a solvent, and dissolution of the deposit is promoted by ultrasonic waves.   The porous member manufacturing method according to claim 1, wherein in the impregnation step, the second raw material liquid is impregnated in the deposited body by applying a second raw material liquid to the deposited body.   In the impregnation step, the second raw material liquid is heated to a melting temperature or higher and a glass transition temperature or lower, and the deposited body is impregnated with the second raw material liquid by immersing the deposited body in the second raw material liquid. The porous member manufacturing method as described.   The porous member manufacturing method according to claim 1, wherein in the deposition step, the deposition target member is moved at a speed equal to or higher than a speed at which the nanofibers reach the deposition target member. An outflow means for causing the first raw material liquid as a raw material of the nanofiber to flow out into the space;
Charging means for charging the first raw material liquid;
An attracting means for attracting nanofibers produced by electrostatic explosion of the raw material liquid to a predetermined place;
Receiving and depositing nanofibers attracted by the attracting means, and a deposition target member for forming a deposit;
Impregnation means for impregnating the formed deposited body with a second raw material liquid that is a raw material of the porous member;
A porous member manufacturing apparatus including a removing unit that dissolves and removes the deposit from the intermediate member with a solvent.