JP3543751B2 - Method for producing continuous porous material - Google Patents

Description

【００３６】
その試験体を２つ用意し、洗浄用水について、試験体１は酢酸溶液、試験体２は水によって洗浄する。酢酸溶液の濃度は０．０５〜０．５重量部であり、酢酸溶液及び水及び空気をフィルターによって汚れ及び固形物を除去し、水圧及び空気圧を０．２５Ｍｐａ、酢酸溶液の温度を２５℃にそれぞれ設定し、酢酸溶液を注入する時間すなわち通液時間を５分、空気を注入する時間すなわち通気時間を７分として、それぞれ洗浄２４回実施した。洗浄回数は通水、通気１回づつで１回とし、通水および通気を繰り返し実施した回数である。上記の条件で初期及び最終通水量を回数ごとに測定した。
試験結果は表２に示す。
【表２】

【００３７】
表２に示されるように、試験体１の通気量は試験体２に比べ、格段に上昇していることがわかる。試験体２は充分に多孔体の気孔内を洗浄されている。
【００３８】
通常、洗浄の進行を確認するための指標として、洗浄元水と多孔体から排出される洗浄排水のｐＨで確認するが、酢酸溶液等、何らかの溶液で洗浄する場合、溶液の種類によりｐＨが違うため、洗浄度合いの指標としてｐＨを用いることは好ましくない。よって、通常の水及び空気による洗浄のときの通気量に注目し、ｐＨとの相関を見た。結果は図２に示す。図２の結果、ｐＨと通気量には強い相関があることがわかる。よって洗浄度合いの指標として通気量を採用した。
【００３９】
【実施例２】
次に、実施例１と同様の試験体を再び作製し、洗浄用水について、試験体３は界面活性剤、試験体４は水によって、洗浄する。界面活性剤の種類としては、アルキル硫酸エステルナトリウム塩を使用した。濃度は０．０３〜０．１ｍｏｌ／ｌに調整し、洗浄溶液及び空気をフィルターによって汚れ及び固形物を除去し、水圧及び空気圧を０．２５Ｍｐａ、洗浄溶液の温度を２５℃に設定し、洗浄溶液を注入する時間すなわち通液時間を５分、空気を注入する時間すなわち通気時間を７分として、洗浄を２４回として、初期通気量と最終通気量を測定した。結果は表３に示す。
【表３】

【００４０】
実施例１と同様に、試験体３は４に比べ、通気量が上昇した。よって、界面活性剤においても、多孔体の洗浄には有効であることがわかった。
【００４１】
【実施例３】
次に、実施例１のエマルジョンスラリーから、図３に示す陶磁器の加圧鋳込成形用型の型を造った。図中５は上型、６は下型であり、両方の型を組み合わせて、鋳込空間８を構成する。１は着肉面９を持つ連続気孔多孔体であり、実施例１のエマルジョンスラリーから硬化されたものである。３はシール用エポキシ樹脂であり、２は水および空気を通す中空路である。なお図示していないが、上型および下型の中空路はすべてつながっており、それぞれの中空路は型外に連結し、脱型時に空気を送り込むための管４につながっている。鋳込空間８にはそれぞれ、泥漿スラリーの注入及び排出に用いられる送泥管７が設けられている。
【００４２】
本発明の実施は図３に示す上型について、洗浄水として、試験体５は実施例２と同様の界面活性剤溶液、試験体６については水にて洗浄を２４回実施し、試験体５については、界面活性剤溶液から水に切り替えて、試験体６は水のまま再度１０回洗浄した。界面活性剤溶液、水及び空気はフィルターによって汚れ及び固形物を除去し、水圧および空気圧をそれぞれ０．２５Ｍｐａに設定し、洗浄水を注入する時間すなわち通水時間を５分、空気を注入する時間すなわち通気時間を７分として、界面活性剤溶液及び水の温度を２５℃に設定して、初期通気量と切替前の通気量、及び最終通気量を測定した。結果は表４に示す。
【表４】

【００４３】
試験体５は界面活性剤溶液で洗浄すると、実施例２と同様、試験体６に比べ格段に上昇している。また水に切り替えた後も通気量は減少せず、最終通気量も試験体５が良好であった。よって、溶液から水に切り替えても通気量に変化が見られないことがわかった。
【００４４】
【発明の効果】
本発明によれば、多孔体の気孔内が十分に洗浄することができ、常に安定した通水および通気性をもたせた連続気孔多孔体を得るための洗浄方法を提供することが可能となる。
【図面の簡単な説明】
【図１】本発明の実施例１、２で使用された試験体の断面図である。
【図２】本発明のｐＨと通気量の相関図である。
【図３】本発明の実施例３で使用された陶磁器の加圧鋳込成形用型の断面図である。
【符号の説明】
１…連続気孔多孔体
２…中空路
３…シール用エポキシ樹脂
４…送気管
５…上型
６…下型
７…送泥管
８…鋳込空間
９…着肉面[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a continuous porous material.
[0002]
[Prior art]
Sintering of metal powder, sintering of thermoplastic resin powder, sintering of inorganic powder, hydration of cements have been used as a means of producing continuous porous materials used for filter media, air diffusers, molds, etc. Curing, mixed press molding of thermoplastic resin and filler, or stamp molding, method of curing resin liquid containing pore forming agent and removing pore forming agent by dissolution extraction or evaporation, use of foaming agent, use of hydrous polyester resin A number of methods have been proposed, such as a method of evaporating water after curing and polymerizing a W / O emulsion. However, when manufacturing a continuous porous material by these methods, the shape and dimensions of the product are significantly restricted, often high-temperature heat treatment and high-pressure pressing are required, or the manufacturing process is complicated. There was a problem. Further, in these methods, it is extremely difficult to control the most important pore diameter when the porous body is used as a filtering material or a diffusing material.
[0003]
As a method of solving these problems and producing a large-sized and complex-shaped continuous porous body with good dimensions and a desired pore diameter, a mixture containing an epoxy resin, a curing agent, a filler, and water is stirred. There is a method in which an emulsion slurry is obtained, and this is cured in a water-containing state, so that the water portion becomes pores. For example, in Japanese Patent Application Laid-Open No. 50-116598, an O / W emulsion slurry comprising a mixture of a glycidyl-based epoxy resin, a polymerized fatty acid polyamide curing agent, a filler and water is prepared, and the slurry is converted to an impermeable mold. The desired purpose has been achieved by casting and hardening in a water-containing state, followed by dehydration. According to this method, it is possible to produce a large-sized and complicated-shaped continuous porous material with high dimensional accuracy, the particle size of the filler, the amount of the reactive diluent, and the mixing ratio of the epoxy resin, the curing agent, the filler, and water. The pore diameter can be controlled by changing the parameters. However, the porous body obtained by this method was biased to a very fine place having a pore diameter of 1.5 μm or less, and had poor practicality as a filtering material, a diffusing material, and a mold material.
[0004]
A method for solving this problem is to use an amide compound obtained by reacting a monomer fatty acid with ethyleneamine [H ₂ N— (CH ₂ —CH ₂ —NH) _n —H (where n is 3 to 5)]. A mixture of a polymerized fatty acid polyamide obtained by a reaction of a polymerized fatty acid and the above-described ethyleneamine, or a mixed reaction product obtained by mixing and reacting the monomeric fatty acid, the polymerized fatty acid, and the ethyleneamine as a curing agent, The mixture containing the mold epoxy resin, the curing agent, the filler and the water is vigorously stirred to obtain an emulsion slurry, which is cast into a water-impermeable mold, cured while containing water, and then dewatered. (JP-A-59-71339). According to this method, a continuous porous body having an average pore diameter of 0.5 to 10 μm, preferably a large and complex-shaped continuous porous body having an average pore diameter of 0.5 to 5 μm is formed with high dimensional accuracy, particularly It has become possible to produce with a desired average pore diameter of preferably 1.5 to 5 μm with high accuracy. JP-A-63-75044 discloses that an emulsion slurry is obtained from a mixture of a glycidyl-based epoxy resin, a polyamide curing agent, a modified polyamine curing agent, or an amine curing agent, a filler, and water. There is also disclosed a method for producing a continuous porous body having pores in the range of 0.2 to 10 μm by casting in a mold and curing it in a water-containing state.
[0005]
However, when the mold material is used, the resin particles precipitated from the emulsion slurry during curing are polymerized in a state of independent fine particles without being bonded to the filler, and the resin component is clogged in the pores of the porous body. It is thought that the porous body is subject to variations in water permeability and air permeability, which are important when using a filter medium, a diffuser, and a mold, and shortens the life of the porous body. .
[0006]
As a means for maintaining the pore diameter and eliminating variations in water permeability and air permeability, Japanese Patent No. 2,592,366 discloses a method of cleaning the inside of pores with pressurized water and / or pressurized air after completion of curing. .
[0007]
[Problems to be solved by the invention]
However, in the conventional method, since the surface tension of water is large, it takes time and effort to remove the remaining resin component without entering the fine pores, and the remaining resin particles are completely removed. The pores could not be removed, clogging occurred in the pores, and the balance between water flow and air flow was poor, leading to a reduction in the life of the porous body.
[0008]
The present invention has been made in order to solve the above-mentioned problems, and it is possible to efficiently and sufficiently wash the inside of pores of a continuous porous body, and to provide a continuous porous body having constantly stable water and air permeability. It is intended to provide a production method for obtaining the same.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a step of preparing a raw material for forming a porous body having continuous pores composed of an epoxy resin and a filler, a step of forming the porous body using the raw material, A method for producing a continuous porous body including a washing step of washing the pores of the porous body, wherein in the washing step, a solution and / or a surface tension that is soluble in a resin component remaining in the pores is lower than that of water. A method for producing a continuous-porous porous body, characterized in that a small-sized solution is introduced into the pores for washing. A liquid containing an alkaline resin component is contained in the pores of the continuous porous body cured in a water-containing state, but by using the cleaning solution, the resin component in the continuous porous body is completely removed. And it is possible to always obtain stable water permeability and air permeability.
[0010]
In a preferred aspect of the present invention, in the washing step, the solution and the air are alternately introduced.
By alternately exchanging the solution and the air, the porous body is repeatedly saturated and anhydrous, and the resin component in the pores can be efficiently washed out.
[0011]
In a preferred aspect of the present invention, in the washing step, the solution and the air are alternately introduced.
After the cleaning with the solution, the pores are impregnated with the cleaning solution. For example, when the pores are used in a pressure casting mold for ceramics, defects occur in the ceramic molded body. After washing with the washing solution, it is desirable to wash with water or water and air.
[0012]
In a preferred aspect of the present invention, a rinsing step of rinsing by introducing cleaning water into the pores is included after the cleaning step.
After washing with the solution, the pores are impregnated with the solution, and for example, when used in a pressure casting mold for ceramics, defects occur in the ceramic molded body. After washing with the solution, it is desirable to wash the pores with water or water and air.
[0013]
In a preferred aspect of the present invention, the solution, washing water and air are introduced into the pores after passing through a filter.
Water and air that are generally used contain fine dirt and solids such as iron powder, and the porous body itself serves as a filter and may clog pores. By performing this, the inside of the pores of the porous body can be washed in a well-balanced manner.
[0014]
In a preferred aspect of the present invention, the solution, the washing water and the air are introduced into the pores under a pressure adjusted to 0.1 to 0.7 MPa.
By using the water and / or air whose pressure has been adjusted, the water and / or air enter even fine pores of the porous body. As the set pressure, if the pressure is too low, it will not penetrate into the pores. Therefore, the higher the applied pressure, the more effective the cleaning.However, in consideration of the strength of the porous body, the pressure is 0.2 to 0.5 MPa. preferable.
[0015]
In a preferred aspect of the present invention, the solution, the washing water and the air are introduced into the pores at a temperature adjusted to 10 to 55 ° C.
As the temperature of water increases, the surface tension decreases, the permeability and fluidity into the pores increase, and the washing efficiency increases. However, the cured product of the emulsion slurry may be deformed or shrunk by heat. If the temperature is too low, the porous body is cooled, and the resin component is easily adsorbed in the pores. For this reason, the water temperature is preferably set to 10 to 55 ° C.
[0016]
In a preferred aspect of the present invention, a hollow passage for passing water and air is formed inside or circumscribing the continuous porous body.
Since the hollow passage is arranged so that the solvent and air permeate uniformly from the surface (inlaid surface) of the continuous porous body, even a large and complicated shape can be washed in a well-balanced manner.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
The continuous porous body referred to here is an emulsion slurry obtained by stirring a mixture containing an epoxy resin, a polyamide curing agent, a filler, water, and the like, casting this into an impermeable mold, and curing it in a water-containing state. Means
[0018]
Hereinafter, the raw material of the continuous porous body will be described. It is convenient to use an epoxy resin that is liquid at room temperature and has a low viscosity, which is convenient for preparing emulsion slurries. Suitable epoxy resins include bisphenol A type, bisphenol F type, and bisphenol AD type. Epoxy resin.
[0019]
As the curing agent, a polyamide-based one, a polyamine-based one, a modified polyamine-based one, or a mixture thereof is suitable for preparing an emulsion slurry having a low viscosity. The particularly suitable among them, a curing agent of polyamide, monomeric fatty acid and ethyleneamine _{[H 2 N- (CH 2 -CH 2} -NH) n -H ( wherein n is 3-5) A mixture of the amide compound obtained by the reaction with the polymerized fatty acid and the above-mentioned ethyleneamine, and the reaction obtained by mixing and reacting the monomeric fatty acid, the polymerized fatty acid, and the ethyleneamine. What is a mixture is mentioned.
[0020]
The filler is not particularly limited, but is preferably a material having a material that can be bonded with an epoxy resin and capable of controlling the particle size, and examples thereof include silica powder and silica sand powder. When it is desirable that the cured product is lightweight, an organic powder or microballoon can be used.
[0021]
Further, as a raw material of the emulsion slurry in the present invention, allyl glycidyl ether, butyl glycidyl ether, styrene oxide, phenyl glycidyl ether, cresyl glycidyl ether, ethylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol Reactive diluents such as glycidyl ether and trimethylolpropane triglycidyl ether; curing accelerators such as benzyldimethylamine and 2,4,6-tris (dimethylaminomethyl) phenol; potassium chloride, sodium chloride, zinc chloride, Calcium chloride, barium chloride, titanium chloride, iron chloride, nickel chloride, magnesium chloride, aluminum sulfate, zinc sulfate, aluminum ammonium sulfate, aluminum sulfate Potassium, potassium sulfate, cobalt sulfate, iron sulfate, copper sulfate, sodium sulfate, nickel, magnesium sulfate, manganese sulfate, sodium hydroxide, potassium hydroxide, may be added soluble inorganic salts such as calcium hydroxide.
[0022]
Next, a method for forming a continuous porous body will be described. When each raw material constituting the emulsion slurry is classified into three phases of a resin (including an epoxy resin and a hardener, a reactive diluent and a hardening accelerator when they are added), a filler, and water, each is preferable. The composition volume ratio is 8 to 45% by volume of resin, 20 to 65% by volume of filler, and 20 to 60% by volume of water, assuming that the whole emulsion slurry is 100% by volume.
[0023]
The resin, filler, and water are stirred by a high-speed stirrer, a reciprocating rotary stirrer, and the like, and the obtained emulsion slurry is cast into a water-impermeable mold, which is cured while remaining in a water-containing state. Upon demolding, a continuous porous material is formed.
[0024]
In the continuous pore porous body obtained above, while the emulsion slurry is hardening, the resin is adhered to the filler, and water forms pores. The resin component is formed alone without adhering to the filler. When the curing is completed, the resin component is present in a state of being suspended or adsorbed in the pores, so that a step of washing the porous body with water and air is required.
[0025]
However, in the washing of water and air, since the surface tension of water is large and it takes time to penetrate into fine pores, a solution soluble in the resin component or / and a solution having a surface tension smaller than that of water is used. The cleaning solution or the cleaning solution and air enable more efficient cleaning than when water is used, and facilitate the removal of the resin component.
[0026]
Acetic acid, hydrochloric acid, and hypochlorite are examples of those soluble in the resin component. Aliphatic amines are contained as a constituent of the resin component. The aliphatic amine becomes soluble by the above-mentioned acid, and dissociates in water to become cationically active. Therefore, the resin component in the pores becomes water-soluble and is drained together with the solution. The concentration of the acid is 0.005 to 5.0 parts by weight, preferably 0.05 to 0.5 parts by weight.
[0027]
As a solution having a surface tension lower than that of water, a surfactant can be used. As the type of the surfactant, an anionic surfactant is preferable. Examples of the type of anionic surfactant include alkali metal salts of higher fatty acids, sulfates, and sulfonates. The concentration of the surfactant is 0.001 to 0.5 mol / l, preferably 0.03 to 0.2 mol / l.
[0028]
After the washing with the solution and the air, a rinsing washing with washing water is performed. After cleaning with a solution, the pores are impregnated with the solution.For example, when used in a pressure casting mold for ceramics, the ceramic moldings need to be cleaned with washing water because defects occur. It becomes.
[0029]
In the washing of the continuous porous material, the washing time of the solution, washing water and air is 2 to 30 minutes / time, and washing is performed alternately and repeatedly. The washing wastewater in the initial stage of washing in the washing water contains a large amount of resin components, and the content of the resin components in the washing wastewater gradually decreases as the washing is repeated. Although the number of times of washing varies depending on the shape, dimensions, and the like of the porous body, the pores of the porous body are eventually sufficiently washed.
[0030]
As for the solution, washing water and air, those from which dirt and solids (iron powder and the like) have been removed by a filter and / or mist before being sent into the porous body are used.
[0031]
Further, the solution, the washing water and the air are used under pressure control. The water pressure and the air pressure are 0.05 to 0.7 MPa, but are preferably set to a pressure of 0.2 to 0.5 MPa, and the mixture is injected into the porous body.
[0032]
The cleaning solution, the cleaning water and the air used are set at 10 to 55 ° C. Normally, it may be at normal temperature, but it is particularly desirable to raise the temperature of water in view of permeability and fluidity into pores. However, if the temperature is too high, the porous body may be deformed and shrunk.
[0033]
An example of the application of the continuous porous material in the present invention is an application to a pressure casting mold for ceramics. With pressure casting of ceramics, a slurry composed of base particles such as clay and a solvent such as water is cast into a porous mold, and by applying pressure to the slurry, the solvent is absorbed in the mold and the slurry is solidified, Thereafter, there is a method of releasing the solidified molded product from the mold. Note that this molding method includes solid casting in which the mold absorbs the solvent from both sides of the molded article, and drainage in which the excess slurry is discharged after the mold absorbs the solvent from one side of the molded article and has a predetermined thickness. Although there is mud casting, the pressure casting mold for ceramics according to the present invention can be applied to any method.
[0034]
As a preferred embodiment of the pressure casting mold, a ventilation / water passage means for removing the molded product is provided. This is because when the molded product is removed from the mold, the solvent and air from the slurry absorbed by the mold by applying pressure from the back surface of the mold (the surface opposite to the inlaid surface) and the molded product are removed from the mold. It is provided in order to allow the material to seep out between them and perform a smooth demolding. A preferred example of the ventilation / water passage means is to provide a hollow passage inside the continuous porous body. The hollow passage is arranged so that the solvent and the air can seep out uniformly from the surface of the continuous porous body (inlaid surface), and the hollow passage is connected to one or a plurality of passages leading to the outside of the mold. I have. At the time of demolding, when the pressurized air is blown through a hollow passage from the passage leading to the outside of the mold, the solvent and air can be exuded between the inlaid surface of the mold and the molded product. A method for forming such a hollow passage inside a continuous porous material is disclosed in JP-A-63-428043 and JP-A-31711. Therefore, the inside of the pores of the porous body can be cleaned using this hollow passage.
[0035]
Embodiment 1
The materials prepared at the mixing ratios shown in Table 1 were placed in a stainless steel container without a lid, and vigorously stirred at room temperature for 10 minutes to obtain a uniform emulsion slurry. This emulsion slurry is a rectangular parallelepiped of 200 × 300 × 20 mm in shape, a tube is stretched in the hollow passage, and cast into a water-impermeable mold surrounded on all sides by a vinyl chloride plate, and covered so that water does not evaporate. Then, the mixture was left standing in a room at 30 ° C. for 42 hours to be cured in a water-containing state, the tube was removed, and the cured product was released from the mold. Thereafter, as shown in FIG. 1, the hollow road entrance 2 was closed with the continuous porous body 1, and the hollow road surface and side surfaces were sealed with a sealing epoxy resin 3. Although not shown, all the hollow paths provided inside the porous body are connected, and each hollow path is connected to the outside of the mold, and is connected to a pipe 4 for feeding air when the mold is released.
[Table 1]

[0036]
Two specimens are prepared, and with respect to washing water, the specimen 1 is washed with an acetic acid solution, and the specimen 2 is washed with water. The concentration of the acetic acid solution is 0.05 to 0.5 parts by weight, and the acetic acid solution, water and air are filtered to remove dirt and solids. The cleaning was carried out 24 times for each setting, with the time for injecting the acetic acid solution, that is, the liquid passing time being 5 minutes, and the time for injecting the air, ie, the ventilation time being 7 minutes. The number of times of washing is the number of times water washing and ventilation are performed once, and water washing and ventilation are repeated. Under the above conditions, the initial and final water flow rates were measured every time.
The test results are shown in Table 2.
[Table 2]

[0037]
As shown in Table 2, it can be seen that the air permeability of the test piece 1 is significantly higher than that of the test piece 2. The inside of the pores of the test body 2 is sufficiently cleaned.
[0038]
Usually, as an indicator for checking the progress of washing, the pH of washing water discharged from the washing source water and the porous body is checked, but when washing with any solution such as an acetic acid solution, the pH differs depending on the type of the solution. Therefore, it is not preferable to use pH as an index of the degree of cleaning. Therefore, attention was paid to the amount of ventilation at the time of washing with ordinary water and air, and the correlation with the pH was observed. The results are shown in FIG. As a result of FIG. 2, it can be seen that there is a strong correlation between pH and aeration. Therefore, the ventilation rate was adopted as an index of the degree of cleaning.
[0039]
Embodiment 2
Next, a test specimen similar to that of Example 1 was prepared again, and the test specimen 3 was washed with a surfactant and the test specimen 4 was washed with water with respect to washing water. As the type of the surfactant, an alkyl sulfate sodium salt was used. The concentration is adjusted to 0.03 to 0.1 mol / l, the washing solution and air are filtered to remove dirt and solids, the water pressure and the air pressure are set to 0.25 Mpa, the temperature of the washing solution is set to 25 ° C, and the washing is performed. The time for injecting the solution, that is, the liquid passing time was 5 minutes, the time for injecting the air, that is, the ventilation time was 7 minutes, and the washing was performed 24 times, and the initial ventilation and the final ventilation were measured. The results are shown in Table 3.
[Table 3]

[0040]
As in the case of Example 1, the test piece 3 had a higher ventilation rate than the test piece 4. Therefore, it was found that surfactants are also effective for cleaning porous bodies.
[0041]
Embodiment 3
Next, from the emulsion slurry of Example 1, a mold for pressure casting of ceramics shown in FIG. 3 was produced. In the figure, reference numeral 5 denotes an upper mold, and 6 denotes a lower mold. Both molds are combined to form a casting space 8. Reference numeral 1 denotes a continuous porous body having an inlaid surface 9, which is hardened from the emulsion slurry of Example 1. Reference numeral 3 denotes a sealing epoxy resin, and reference numeral 2 denotes a hollow passage through which water and air pass. Although not shown, the upper and lower hollow paths are all connected, and each of the hollow paths is connected to the outside of the die, and is connected to a pipe 4 for feeding air when the die is released. Each of the casting spaces 8 is provided with a mud feeding pipe 7 used for injecting and discharging the slurry.
[0042]
In the practice of the present invention, the upper mold shown in FIG. 3 was washed with the same surfactant solution as in Example 2 as the washing water, and the specimen 6 was washed 24 times with water, and the specimen was washed 24 times. With respect to the test, the surfactant solution was switched to water, and the test piece 6 was washed again 10 times with water. The surfactant solution, water and air are cleaned with a filter to remove dirt and solids, the water pressure and the air pressure are set to 0.25 Mpa, respectively, and the time for injecting the wash water, that is, the time for passing water for 5 minutes and the time for injecting air That is, the temperature of the surfactant solution and water was set to 25 ° C. with the ventilation time set to 7 minutes, and the initial ventilation volume, the ventilation volume before switching, and the final ventilation volume were measured. The results are shown in Table 4.
[Table 4]

[0043]
When the test piece 5 was washed with the surfactant solution, the test piece 5 was significantly higher than the test piece 6 as in Example 2. Further, even after switching to water, the ventilation rate did not decrease, and the test piece 5 had a good final ventilation rate. Therefore, it was found that there was no change in the ventilation amount even when the solution was switched to water.
[0044]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the inside of the pore of a porous body can be fully wash | cleaned, and it becomes possible to provide the washing | cleaning method for obtaining the continuous porous porous body which always provided stable water permeability and air permeability.
[Brief description of the drawings]
FIG. 1 is a sectional view of a test body used in Examples 1 and 2 of the present invention.
FIG. 2 is a correlation diagram between pH and aeration according to the present invention.
FIG. 3 is a cross-sectional view of a pressure casting mold for porcelain used in Example 3 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Continuous porous body 2 ... Hollow path 3 ... Epoxy resin for sealing 4 ... Air supply pipe 5 ... Upper mold 6 ... Lower mold 7 ... Mud pipe 8 ... Casting space 9 ... Inlaid surface

Claims (12)

A step of preparing a raw material for forming a porous body having continuous pores composed of an epoxy resin and a filler, a step of forming the porous body using the raw material, and a washing step of cleaning the inside of the pores of the formed porous body. a method of manufacturing a open-cell porous material comprising said in the washing step, acetic acid, hydrochloric acid, have lines washed by introducing either an acid in the pores is selected from hypochlorous acid, the concentration of the acid A method for producing a continuous porous material , wherein the content is 0.005 to 5.0 parts by weight . A step of preparing a raw material for forming a porous body having continuous pores composed of an epoxy resin and a filler, a step of forming the porous body using the raw material, and a washing step of cleaning the inside of the pores of the formed porous body. A method for producing a continuous pored porous material comprising: washing in the washing step by introducing any acid selected from acetic acid, hydrochloric acid, and hypochlorous acid into the pores, wherein the concentration of the acid is 0. 0.05 to 0.5 parts by weight. A step of preparing a raw material for forming a porous body having continuous pores composed of an epoxy resin and a filler, a step of forming the porous body using the raw material, and a washing step of cleaning the inside of the pores of the formed porous body. A method for producing a continuous pored porous material comprising: washing in the washing step by introducing any anionic surfactant selected from a higher fatty acid alkali metal salt, a sulfate salt, and a sulfonate into the pores. The concentration of the anionic surfactant is 0.001 to 0.5 mol / l A method for producing a continuous porous body, characterized in that: A step of preparing a raw material for forming a porous body having continuous pores composed of an epoxy resin and a filler, a step of forming the porous body using the raw material, and a washing step of cleaning the inside of the pores of the formed porous body. A method for producing a continuous pored porous material comprising: washing in the washing step by introducing any anionic surfactant selected from a higher fatty acid alkali metal salt, a sulfate salt, and a sulfonate into the pores. And the concentration of the anionic surfactant is 0.03 to 0.2. mol / l A method for producing a continuous porous body, characterized in that: Wherein in the cleaning step, the manufacturing method of the open-cell porous material according to any one of claims 1 to 4, characterized in that alternately introduced into the acid or anionic surfactant and air. The method according to any one of claims 1 to 5, further comprising a rinsing step of rinsing by introducing cleaning water into the pores after the cleaning step. The method according to claim 6 , wherein in the rinsing step, the washing water and the air are alternately introduced. The method according to any one of claims 1 to 7 , wherein the acid or anionic surfactant , washing water, and air are introduced into the pores after passing through a filter. The acid or anionic surface active agent, the washing water and air, according to any one of claims 1 to 8, characterized in that introduced into the pores while pressure adjusted to 0.1~0.7MPa Method for producing a continuous porous material. The continuous pore porous material according to any one of claims 1 to 9 , wherein the acid or anionic surfactant , washing water, and air are introduced into the pores in a state where the temperature is adjusted to 10 to 55 ° C. How to make the body. The method according to any one of claims 1 to 10 , wherein a hollow passage for passing water and air is formed inside or circumscribing the continuous porous body. The method for producing a continuous porous body according to any one of claims 1 to 11 , wherein the continuous porous body is a member that forms a pressure casting mold for ceramics.

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