JP4231347B2 - Ventilation filter and container using the same - Google Patents

Description

【００７９】
この結果、本発明の試料Ｎｏ．９〜１１、１５〜１７、２１〜２３、２７〜２９、３３〜３５は、液体の漏出がなく、３０日後の漏出もなかった。また、通気性も高く、滴下テストで液体が、９０容量％以上排出され、優れた特性を示した。
【００８０】
すなわち、本発明の通気フィルタ５は、セラミック多孔質体１の平均細孔径が１．０〜５．０μｍ、且つ粒状物質３の粒子径が０．３〜５μｍであることにより、優れた特性を示すことが判り、さらに、これらの通気フィルタを容器に用いると、特性の優れた容器が提供できることがわかる。
【００８１】
（実施例２）
次に、セラミック多孔質体１のアルミナの代わりに、平均粒径１０μｍのコージェライト、シリカを用いて、それぞれ平均細孔径が３μｍのセラミック多孔質体１を焼成温度１１００℃〜１４００℃で作製し、表２に示す粒状物質３を用いて、実施例１と同様の評価を行った。
【００８２】
なお、アルミナを粒状物質３として用いる場合には、フッ素樹脂やシリコン樹脂に比べて撥水及び撥油性が小さいことから、実施例１の粒状物質３とフッ素樹脂の場合で示した結合部材４の溶液との比率を４：６以下、つまり粒状物質３の比率を少なくして、結合部材４が十分アルミナの粒状物質３を覆えるようにして通気フィルタ５を作製して評価のテストを行った。
【００８３】
【表２】

【００８４】
この結果、本発明の試料Ｎｏ．４５〜４７、５１．０〜５．０３、５７〜５９、６３〜６５、６９〜７１、７５〜７７は、液体の漏出がなく、３０日後の漏出もなかった。また、通気性も高く、滴下テストで液体が、９０容量％以上排出され、優れた特性を示した。
【００８５】
すなわち、本発明の通気フィルタ５は、セラミック多孔質体１にアルミナの
代わりにコージェライトやジルコニア等の他のセラミックを用いても同様の効果が得られ、また、粒状物質３のフッ素樹脂の代わりに、シリコン樹脂やアルミナなどを用いても効果が得られることが判り、さらに、これらの通気フィルタを容器に用いると、特性の優れた容器が提供できることがわかる。
【００８６】
【発明の効果】
本発明の通気フィルタは、通気性を向上するためにセラミック多孔質体の平均細孔径をある程度大きくしたとしても、撥水及び撥油層の粒状物質同士が接触することで撥水及び撥油層の材料で目づまりを起こすことなく微小間隙を形成して通気性を確保でき、しかも、この微小間隙がセラミック多孔質体に液体を通過させるのを防ぐので、耐薬品性、耐熱性、耐圧性及び防液性を有し、気体を双方向に通過させる通気性を有することができる通気フィルタを提供することができる。
【００８７】
そして、このような通気フィルタを用いた容器は、油、界面活性剤、有機溶剤、酸性又はアルカリ性溶液などの液体の存在下でも、あるいは高温においても液体を通過させることなく、気体が双方向に通過できることを可能とするものである。
【図面の簡単な説明】
【図１】 本発明の通気フィルタの部分断面図を示す。
【図２】 本発明の容器を示すもので、（ａ）、（ｂ）は概略断面図を示す。
【図３】 本発明の他の容器の概略断面図を示す。
【図４】 本発明のさらに他の容器示すもので、（ａ）は概略断面図、（ｂ）は液体中に容器を入れた状態の概略断面図を示す。
【符号の説明】
１・・・セラミック多孔質体
２・・・撥水及び撥油層
３・・・粒状物質
４・・・結合部材
５、１２、２２、３２・・・通気フィルタ
１１、２１、３１・・・容器
１４、２４、３４・・・液体
１５、２５、３５・・・気体
１６、２６・・・排出口
２３・・・通気口
２７・・・液体供給口
２９・・・容器隔壁
３３・・・容器[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ventilation filter that has air permeability but prevents liquid from passing therethrough, and a container that can maintain substantially the same internal pressure and external pressure using the same.
[0002]
[Prior art]
For example, ventilation filters are used for the purpose of liquid and dust prevention at the vents of various sealed containers in order to reduce fluctuations in the internal pressure due to temperature changes in electronic and precision equipment for cameras and zooming and focusing. It is done.
[0003]
In addition, in a container such as a baby bottle, air is introduced into the interior that has been sucked and decompressed. For In addition, for medical fluid storage containers such as infusion sets for injecting drugs and the like into the living body, or for infusion devices such as preservatives using a pressure drop, the pressure inside the container should be set to the external pressure. Equalize For Vents are required, and these vents Water and oil repellent Sexual communication Care Ill T in use.
[0004]
These ventilation filters have a function of allowing gas to pass through, although liquid or water droplets outside or inside do not pass. As a material that passes through such a gas, a porous film such as polytetrafluoroethylene (PTFE), a nonwoven fabric, a mesh, or the like is used.
[0005]
On the other hand, when used in an industrial field among vent filters, there is a vent filter having a so-called deaeration function that separates and removes or recovers various gases and volatile substances dissolved in a liquid or liquid substance. It has been used over a wide range of fields, and a product with good deaeration efficiency has been demanded.
[0006]
For example, ultrapure water used for semiconductor cleaning is strictly regulated in terms of dissolved oxygen concentration to suppress the generation of viable bacteria and prevent oxidation of silicon wafers. There has also been a strict requirement for degassing from any liquid used in processing.
[0007]
In familiar places, water for the purpose of preventing red water in tap water that supplies tap water, or in middle water that is reused for industrial purposes or for other purposes such as washing and watering buildings, or for the prevention of microbial growth in stored water It is used in the field of deoxygenation treatment, and in the field of deoxygenation for the purpose of preventing deterioration of liquid foods such as liquor, beer, juice or cooking oil.
[0008]
For deoxygenation in such fields, chemical degassing or physical degassing is employed, but chemical degassing is performed using a deoxygenating agent such as hydrazine or sodium sulfite. For this reason, there is a problem of toxicity, the use is limited, and there is a problem that regeneration treatment is necessary when using an ion exchange resin or the like.
[0009]
Therefore, the membrane type deaeration method in which the gas-liquid interface is enlarged through the membrane having the gas separation function, which is the physical deaeration method industrially, and the gas is separated to the decompression side, the apparatus is small and the processing step Was considered promising because of its simplicity.
[0010]
Under such circumstances, Patent Document 1 discloses a method of deaeration using a porous hollow fiber membrane made of a poly-4-methylpentene-1 polymer material, and Patent Document 2 describes mechanical strength. And a method of deaeration using a hollow fiber-shaped or spiral-shaped composite membrane formed with a non-porous active layer in which heat resistance and dimensional stability are easily obtained have been proposed. Alternatively, the component of the liquid substance oozes out on the membrane surface and the operability is deteriorated, so that the degree of vacuum for deaeration cannot be increased. On the other hand, the material using a non-porous active layer can be removed. There was a problem of inefficiency.
[0011]
For this purpose, a degassing ceramic composite member comprising a ceramic porous support as shown in Patent Document 3 and a ceramic layer in which a pore diameter of 1 nm or less occupies 80% or more of the total pore volume is disclosed. Yes.
[0012]
[Patent Document 1]
Japanese Patent Laid-Open No. 2-107317
[0013]
[Patent Document 2]
JP-A-6-335623
[0014]
[Patent Document 3]
JP-A-11-216303
[0015]
[Problems to be solved by the invention]
However, for example, in a ventilation filter that has a function of liquid-proofing electrical components mounted on automobiles, it is exposed to a harsh environment where there are many oil vapors of various automobile oils such as engine oil in the engine room, In addition, if a precision part or electronic part is incorporated inside a camera used in a general living environment and equipped with a ventilation filter to maintain air permeability, liquids and fats and oils containing surfactants such as kitchen detergent Or they often come in contact with body fat, and these oils and surfactants are not passed through. Care Ill To In contact Water and oil repellent There is a problem that the air permeability and air permeability are lost.
[0016]
Furthermore, when a ventilation filter is used for a container for injecting medicine or the like, if the medicine injected into the container is acidic or alkaline, or an organic solvent such as alcohol or acetone, these liquids may cause corrosion or corrosion. There was a problem of dissolution.
[0017]
In addition, when used in an infusion set used for the human body, it is necessary to boil the ventilation filter at high temperature as a sterilization process. In such a case, pores inside the ventilation filter are blocked at high temperature, resulting in a decrease in air permeability. In the end, however, there was a problem that the air permeability was lost.
[0018]
Furthermore, when ventilating with pressure, there is a problem that the pores of the ventilation filter are greatly deformed and liquid leakage occurs.
[0019]
And in order to solve such a problem, although it is good to form the ceramic layer which occupies 80% or more of the pore diameter of 1 nm or less to the pore diameter of 1 nm or less to a ceramic porous body as shown in patent document 3. Even if such a method is used, the chemical resistance, heat resistance, pressure resistance, and liquid resistance excellent in the ventilation filter can be realized, but the problem that the air permeability is greatly reduced remains.
[0020]
【the purpose】
Therefore, an object of the present invention is to provide a ventilation filter having chemical resistance, heat resistance, pressure resistance, liquidproofness, and air permeability at the same time, and a container having the ventilation filter.
[0021]
[Means for Solving the Problems]
The present invention passes gas in both directions without allowing liquid to pass. Let A porous ceramic body having an average pore diameter of 1.0 to 5.0 μm, and a granular material having an average particle diameter of 0.3 to 5 μm formed on at least one surface of the ceramic porous body. contains Water and oil repellent A vent filter including a layer.
[0022]
And Water and oil repellent The granular material of the layer Water and oil repellent And having a binding member for binding the particulate material and the ceramic porous body to each other.
[0023]
Further, the particulate material is a fluororesin and / or a silicon resin.
[0024]
Furthermore, in the container for filling the liquid inside, a part of the container wall is provided with the above-described ventilation filter.
[0025]
[Action]
According to the ventilation filter of the present invention, in order to improve the air permeability, the ceramic is used. Many Even if the average pore diameter of the porous body is increased to some extent, Water and oil repellent The granular materials in the layers come into contact Water and oil repellency The material of the layer can form a micro gap without clogging and ensure air permeability, and also prevents the micro gap from allowing liquid to pass through the ceramic porous body, so chemical resistance, heat resistance, pressure resistance and Liquid-proof and allows gas to pass in both directions Let It can have breathability.
[0026]
And Water and oil repellency The granular material of the layer Water and oil repellency And having a binding member for binding the particulate material and the ceramic porous body to each other, The Even without covering with a coupling member Water and oil repellency The liquid resistance can be improved and the liquid-proof property can be further improved.
[0027]
Furthermore, by using a fluororesin and / or a silicon resin as the particulate material, the oil repellency and water repellency can be further improved and the liquidproof effect can be enhanced.
[0028]
Further, by using the ventilation filter in a container for filling a liquid therein, there is no leakage of liquid through the ventilation filter, and the atmospheric pressure in the container and the external atmospheric pressure are kept substantially the same. Therefore, it is possible to realize a container having chemical resistance, heat resistance, pressure resistance, and capable of adjusting atmospheric pressure while maintaining liquid-proof property.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the ventilation filter of the present invention will be described with reference to the drawings.
[0030]
FIG. 1 is a partial sectional view showing the structure of a ventilation filter of the present invention.
[0031]
The ventilation filter 5 in FIG. 1 includes a ceramic porous body 1 and Water and oil repellent Layer 2 and at least part of the surface of the ceramic porous body 1 Water and oil repellency Layer 2 is provided.
[0032]
this Water and oil repellent When the liquid contacts the layer 2, the surface tension of the liquid increases, Water and oil repellency The contact angle with the layer 2 becomes extremely large, Water and oil repellent By reducing the contact area of the layer 2, it is possible to eliminate the liquid passing through the pores.
[0033]
Also, Water and oil repellency The layer 2 includes a particulate material 3 and also includes a particulate material 3 and a ceramic porous body 1 and a bonding member 4 that bonds the particulate materials 3 to each other.
[0034]
here, Water and oil repellent If the layer 2 is composed only of the coupling member 4, it is difficult to uniformly form the pores through which the gas passes, and in severe cases, the pores through which the gas of the ceramic porous body 1 passes is sealed to cause clogging. However, by mixing the particulate material 3 and connecting the particulate material 3 and the ceramic porous body 1 to each other by the connecting member 4, the particulate materials 3 come into contact with each other and a minute gap is formed. , Ceramimi Many Porous material 1 Even if the average pore diameter is increased to ensure air permeability, the coupling member 4 is completely embedded. Be turned Gas can pass through without.
[0035]
Therefore, the average pore diameter of the ceramic porous body 1 is set to 1.0 to 5.0 μm, Water and oil repellent The average particle diameter of the particulate material 3 in the layer 2 is preferably 0.3 to 5.0 μm.
[0036]
That is, according to the present invention, ceramic is used for the porous body constituting the ventilation filter 5 to improve chemical resistance, heat resistance, and pressure resistance, and gas is allowed to pass but liquid is difficult to pass. The two functions of water and liquid resistance are exhibited at the same time.
[0037]
When the average pore diameter of the ceramic porous body 1 is larger than 5.0 μm, Water and oil repellent Granular material 3 and bonding member 4 penetrate deep into the pores of ceramic porous body 1 Water and oil repellent This is not preferable because the layer 2 becomes non-uniform and the liquid easily passes. Conversely, when the average pore size of the ceramic porous body 1 is smaller than 1.0 μm, Water and oil repellent When the layer 2 is provided, the air permeability of the air filter 5 is lowered, which is not preferable.
[0038]
Therefore, a more preferable range of the average pore diameter is preferably 2.0 to 4.0 μm in order to simultaneously exhibit two functions of air permeability and liquid-proof property. The average pore diameter of the ceramic porous body 1 is a value measured using a mercury intrusion method.
[0039]
Here, the ceramic porous body 1 is preferably composed of a material having oil resistance, chemical resistance, heat resistance, and pressure resistance, and is selected from the group of alumina, zirconia, silica, cordierite, and titania, for example. It is preferable that at least one kind is composed of ceramics containing 50% or more, 70% or more, and further 90% or more, and alumina, silica, and cordierite are particularly preferable in terms of low cost.
[0040]
Among these, alumina is more preferable in terms of high chemical resistance against oils, solvents, acids, alkalis, and the like, and α-alumina is preferable in terms of stability of the crystal structure against high-temperature steam.
[0041]
In addition, the average particle size of the granular material 3 is set to 0.3 to 5.0 μm because when the average particle size is smaller than 0.3 μm, the minute gap formed by the contact between the granular materials 3 Almost disappears and air permeability decreases. When the average particle diameter is larger than 5.0 μm, the minute gap formed by the contact between the granular materials 3 becomes too large, and the liquid-proof property is deteriorated.
[0042]
Therefore, in order to simultaneously exhibit the two functions of air permeability and liquid-proof property, a more preferable range of the average particle diameter is 0.5 to 2.0 μm. The average particle diameter is a value measured by a centrifugal sedimentation light transmission method.
[0043]
However, ceramic Many Even if the average pore diameter of the porous material 1 is increased and the average particle diameter of the granular material 3 is smaller than this, the minute gap between the granular materials 3 is only further reduced within the above range. Can be used.
[0044]
The material of the particulate material 3 may be appropriately selected from glass, ceramics, metal, resin, etc., and the shape thereof is not limited as long as it is granular, such as a substantially square, a substantially polygon, a substantially cylinder, a substantially spherical shape, an indefinite shape, A substantially spherical shape is preferable in terms of eliminating variation in average pore diameter.
[0045]
Furthermore, the granular material 3 Water and oil repellent Regardless of gender, Water and oil repellent If you do not have sex Water and oil repellent The particulate material 3 is covered with a bonding member 4 having a property, and the bonding member 4 makes the uniform Water and oil repellent It is necessary to produce an effect. On the other hand, the granular material 3 is Water and oil repellent Those having properties are preferred. The reason is, Water and oil repellent By using the granular material 3 having properties, Water and oil repellent Of layer 2 as a whole Water and oil repellent In addition to improving the performance, it is not necessary to cover the particulate material 3 with the bonding member 4, so that the amount of the bonding member 4 used can be reduced. No longer get in, Water and oil repellent It is possible to prevent the layer 2 itself from becoming uneven.
[0046]
And like this Water and oil repellent As the granular material 3 having the property, it is preferable to use a fluororesin and / or a silicon resin.
[0047]
Moreover, as the coupling member 4, Water and oil repellent Fluorine resin, silicon resin, acrylic resin, epoxy resin, urethane resin and the like may be used as a binder, and a mixture of at least one of these and an organic solvent is used.
[0048]
Examples of the organic solvent for the coupling member 4 include ethyl alcohol, n − Any of alcohols such as heptane and toluene, aromatics and aliphatics are used. And as mixing ratio of the binder of the coupling member 4 and an organic solvent, 1: 9-4: 6 are preferable. mixing ratio so 1: 9 Super If the binder is reduced, the bonding strength between the particulate materials 3 or between the particulate material 3 and the ceramic porous body 1 is not preferable. Also, the mixing ratio so 4: 6 Super If the binder is increased, the bonding member 4 becomes highly viscous, so that it becomes difficult to apply to the porous ceramic body 1 and the uniform Water and oil repellent Since layer 2 is difficult to be formed, it is not preferable.
[0049]
And as mixing ratio of the granular material 3 and the coupling member 4, 4: 6-7: 3 is preferable. mixing ratio so 4: 7 Super If the amount of particulate matter is reduced, the ceramic porous body 1 is water repellent. And oil repellent When the layer 2 is formed, the interval between the granular materials 3 becomes wide and liquid leaks from the gap. Ma In addition, there is a possibility that the gap between the particulate substances 3 may be filled with the coupling member 1 and the ventilation performance may be lowered. Also, the mixing ratio But 7: 3 Super e Then Granular material Shape between 3 Small plow made while Becomes too large and the liquid-proof property decreases, which is not preferable. Also, the mixing ratio so 7: 3 Super If you reduce the number of coupling members 4 , This is not preferable because the bonding strength between the particulate materials 3 or between the particulate material 3 and the ceramic porous body 1 is lowered.
[0050]
In addition, Water and oil repellent In order to maintain the effect and keep the effect of suppressing the passage of liquid for a long time, Water and oil repellent The layer 2 is preferably provided uniformly on the surface of the ceramic porous body 1, and the thickness thereof has sufficient mechanical strength to ensure air permeability. For Moreover, it is preferable that it is 0.5-10.0 mm.
[0051]
As described above, the ventilation filter 5 of the present invention has a feature that gas passes but liquid does not pass, and the air permeability of the container is ensured while keeping the liquid-proof property, and the pressure inside the container is constant. Since the container can be suitably used as a container that can be maintained at a high temperature, it can be applied to any field as long as it is used in a portion that comes into contact with a liquid and requires air permeability.
[0052]
Next, the manufacturing method of the ventilation filter 5 of this invention is demonstrated.
[0053]
First, a desired organic binder is added to ceramic powder having an average particle diameter of 2 to 30 μm, and after forming into a desired shape by a known molding means such as press molding, extrusion molding, injection molding, casting molding, tape molding, etc., 1200 The ceramic porous body 1 is produced by firing at a temperature of 1C to 1600C.
[0054]
Next, the particulate material 3 having a particle diameter of 0.3 to 5.0 μm and these are bonded to each other. for By mixing the binding member 4 to prepare a solution, and applying this solution on the ceramic porous body 1, Water and oil repellent The conductive layer 2 is formed.
[0055]
At this time, as a method for applying the above-described solution to the ceramic porous body 1, a general application method such as a spray method, a brush coating method, a dipping method, or a transfer method may be used. Method and dipping method may be simple.
[0056]
Then, if it dries at 50-80 degreeC, the ventilation filter 5 of this invention can be obtained.
[0057]
Next, the container using the ventilation filter of this invention is demonstrated using FIGS.
[0058]
The container of the present invention is a container for filling a gas and / or a liquid inside the container, and includes the above-described ventilation filter. Therefore, the atmospheric pressure inside the container and the external atmospheric pressure can be kept substantially the same.
[0059]
For example, as shown in FIG. 2A, a liquid 14 and a gas 15 are placed inside the container 11. When A part of the wall surface of the container 11 is constituted by the ventilation filter 12, and the wall surface other than the ventilation filter 12 is constituted by a wall that does not allow the liquid 14 and the gas 15 to pass therethrough.
[0060]
FIG. 2B shows the container 11 shown in FIG. 2A provided with a discharge port 16 for the liquid 14.
[0061]
Further, as shown in FIG. 3, a vent 23 may be provided in a part of the container 21, and the vent filter 22 may be provided in a container partition wall 29 provided in the container 21. The container 21 is filled with the liquid 24 and the gas 25, and the liquid 24 is discharged from the discharge port 26, and the gas passes through the ventilation filter 22 into the container 21 and is combined with the gas 25. Pressure adjustment is performed. Further, a liquid supply port 27 for supplying a liquid may be provided as desired. When the liquid 24 is supplied from the liquid supply port 27 and the amount of the liquid 24 increases to increase the pressure in the container 21, the gas 25 is released to the outside through the ventilation filter 22 to keep the pressure constant. Can do.
[0062]
Such containers can be suitably used as containers for gasoline tanks, oil tanks, organic solvent tanks, drug tanks, detergent tanks, baby bottles, infusion bottles, and the like. For example, by providing the air supply filter of the present invention at the supply port (cap) of these containers, it is possible to keep the atmospheric pressure in various containers and the external atmospheric pressure substantially the same without leakage of the liquid filled inside. it can.
[0063]
Further, as shown in FIG. 4A, a part of the wall surface of the container 31 is constituted by a ventilation filter 32. Inside the container 31, an electronic device, a precision machine, or the like that dislikes getting wet with a liquid can be mounted. In FIG. 4B, the container 31 is provided with two ventilation filters 32, but the number of use is not limited, and it goes without saying that one or three or more may be used. .
[0064]
In addition, according to the present invention, as shown in FIG. 4B, the liquid container 33 is immersed in the liquid 34 and a part of the ventilation filter 32 and the liquid 34 are in contact with each other. 34 does not enter the inside of the container 31, and the gas 35 can pass from the inside of the container 31 to the outside or from the outside to the inside through the ventilation filter 32, so that the atmospheric pressure in the container 31 is substantially the same. It is possible to keep.
[0065]
Such a container has, for example, an electronic device or precision device inside, and has a liquidproof and breathable container, and the container is deformed by pressurization from the outside of a flexible resin container or the like. It can be suitably used as a container or the like that prevents the increase in internal pressure even by heat treatment.
[0066]
【Example】
Example 1
An organic binder was added to α-alumina powder having an average particle diameter of 2 to 30 μm, and extrusion molding was performed using the mixed ceramic material, followed by drying and cutting to obtain a flat molded body. The formed body was cut into 30 mm length and 30 mm width, and then fired in the atmosphere at 1200 ° C to 1600 ° C to produce a plurality of ceramic porous bodies 1 each having a thickness of 1 mm and an average pore diameter as shown in Table 1. did.
[0067]
However, the average pore diameter of the ceramic porous body 1 was measured using a micromeritics (pore sizer 9310 type) having a mercury intrusion method as a measurement principle.
[0068]
Next, a granular material 3 having an average particle size shown in Table 1 is mixed at a ratio of 5: 5 with a bonding member 4 in which 20% by weight of a fluororesin and 80% by weight of an organic solvent are mixed. And a solution not mixed. The average particle diameter in this case is a value measured using Microtrack 9320-X100 manufactured by Nikkiso Co., Ltd.
[0069]
Then, the ceramic porous body 1 is dipped in each of the prepared solutions, held for 1 minute, pulled up, dried at room temperature for 1 hour, and then dried in hot air at 80 ° C. for 1 hour. On the surface of 1 Water and oil repellent A ventilation filter 5 in which the layer 2 was formed was produced.
[0070]
In order to investigate the chemical resistance of the ventilation filter 5, the ventilation filter 5 is immersed in a solution using 1% sulfuric acid, 1% sodium hydroxide, and acetone as an organic solvent at room temperature for 1 hour and washed. The sample was dried and the weight change was 5% or less as good, and the product exceeding 5% was judged as poor as x.
[0071]
Further, the ventilation filter 5 was heated at 200 ° C., and the heat resistance was evaluated as “good” when the weight change was 5% or less and “bad” when the weight change exceeded 5%.
[0072]
The obtained ventilation filter 5 was allowed to transmit Air at a pressure of 100 kPa using a pore measuring device (Perm Porometer) manufactured by Porous Materials, and the permeation amount was measured, and 15 L / min / cm ² Exceeding ◎, 3-15 L / min / cm ² ○ 3L / min / cm ² Less than were shown by x, and air permeability was evaluated.
[0073]
In addition, a pressure resistance test was conducted in which air was passed through the air-permeable filter at a pressure of 500 kPa.
[0074]
A container shown in FIG. 2 (a) in which the obtained ventilation filter 5 is attached to the supply port (cap) is prepared, and 100 ml of the liquid shown in Table 1 is supplied. Observed. The liquid-proof property was evaluated as “O” when there was no leakage of liquid and “X” when leakage. In addition, in the case of no leakage, in order to investigate the durability, the leakage of the liquid after 30 days was further observed with the naked eye or a binocular microscope (10 to 40 times). What was done was made into x.
[0075]
Further, the container shown in FIG. 2B was prepared, and 100 ml of the liquid shown in Table 1 was supplied to the inside of the container, and the liquid inside was dropped from the outlet, and the amount of liquid dropped was evaluated. And when 90 volume% or more of liquid was discharged | emitted, (circle) and less than 90 volume% were set as x, and the propriety by the dripping test when using the ventilation filter 5 for a container was evaluated.
[0076]
Moreover, the leak test mentioned above was performed using the thing which heated the ventilation filter 5 at 200 degreeC for 1 hour, and liquid-proof evaluation was performed. Then, the heat resistance was evaluated with a circle indicating no leakage of liquid and a circle indicating leakage.
[0077]
In addition, among the evaluations described above, an overall evaluation was made by assuming that one with x, x, all ○ were ○, all were ○, and those containing ◎ were ◎.
[0078]
[Table 1]

[0079]
As a result, sample no. 9-11, 15-17, 21-23, 27-29, 33-35 had no leakage of liquid, and no leakage after 30 days. Moreover, the air permeability was high, and 90% by volume or more of liquid was discharged in the dropping test, and excellent characteristics were exhibited.
[0080]
That is, the ventilation filter 5 of the present invention has excellent characteristics because the average pore diameter of the ceramic porous body 1 is 1.0 to 5.0 μm and the particle diameter of the granular material 3 is 0.3 to 5 μm. Further, it can be seen that when these ventilation filters are used in containers, containers having excellent characteristics can be provided.
[0081]
(Example 2)
Next, instead of the alumina of the ceramic porous body 1, the ceramic porous body 1 having an average pore diameter of 3 μm is prepared at a firing temperature of 1100 to 1400 ° C. using cordierite and silica having an average particle diameter of 10 μm. The same evaluation as in Example 1 was performed using the granular material 3 shown in Table 2.
[0082]
Note that when alumina is used as the particulate material 3, it is compared with fluorine resin or silicon resin. Water and oil repellent Since the property is small, the ratio of the granular material 3 of Example 1 to the solution of the bonding member 4 shown in the case of the fluororesin is 4: 6 or less, that is, the ratio of the granular material 3 is reduced, A ventilation filter 5 was prepared so as to sufficiently cover the particulate material 3 of alumina, and an evaluation test was performed.
[0083]
[Table 2]

[0084]
As a result, sample no. 45 to 47, 51.0 to 5.03, 57 to 59, 63 to 65, 69 to 71, and 75 to 77 did not leak liquid and did not leak after 30 days. Moreover, the air permeability was high, and 90% by volume or more of liquid was discharged in the dropping test, and excellent characteristics were exhibited.
[0085]
That is, the ventilation filter 5 of the present invention is made of alumina on the ceramic porous body 1.
It can be seen that the same effect can be obtained by using other ceramics such as cordierite and zirconia instead, and the effect can be obtained by using silicon resin or alumina instead of the fluororesin of the particulate material 3. Furthermore, it can be seen that when these ventilation filters are used in containers, containers having excellent characteristics can be provided.
[0086]
【The invention's effect】
The ventilation filter of the present invention is made of ceramic to improve air permeability. Many Even if the average pore diameter of the porous body is increased to some extent, Water and oil repellent The granular materials in the layers come into contact Water and oil repellent By forming a minute gap without clogging with the material of the layer, air permeability can be secured, and this minute gap prevents the liquid from passing through the ceramic porous body. , It has chemical resistance, heat resistance, pressure resistance and liquid resistance, and allows gas to pass in both directions. Let It is possible to provide a ventilation filter that can have air permeability.
[0087]
A container using such a ventilation filter allows gas to flow in both directions in the presence of a liquid such as oil, surfactant, organic solvent, acidic or alkaline solution, or even at a high temperature without allowing the liquid to pass through. It is possible to pass through.
[Brief description of the drawings]
FIG. 1 shows a partial cross-sectional view of a ventilation filter of the present invention.
FIGS. 2A and 2B show a container of the present invention, and FIGS. 2A and 2B are schematic cross-sectional views.
FIG. 3 shows a schematic cross-sectional view of another container of the present invention.
4A and 4B show still another container of the present invention, in which FIG. 4A is a schematic cross-sectional view, and FIG. 4B is a schematic cross-sectional view of a state in which the container is placed in a liquid.
[Explanation of symbols]
1 ... Ceramic porous body
2 ... Water and oil repellent layer
3 ... Particulate matter
4 ... Connecting member
5, 12, 22, 32 ... ventilation filter
11, 21, 31 ... container
14, 24, 34 ... liquid
15, 25, 35 ... gas
16, 26 ... discharge port
23 ... Vent
27 ... Liquid supply port
29 ... Container partition
33 ... Container

Claims (4)

Without passing through the liquid, a vent filter to be passed through a gas bidirectionally, the average pore diameter of the ceramic porous body of 1.0 to 5.0 m, formed on at least one surface of the ceramic porous body ventilation filter having an average particle diameter that is characterized in that it comprises a water-repellent and oil-repellent layer containing a particulate substance 0.3 to 5 m. Wherein with particulate material of the water repellent and oil repellent layer has a water-repellent and oil-repellent properties, ventilation according to claim 1, characterized by comprising a coupling member for coupling the particulate material and the porous ceramic body to each other filter. The ventilation filter according to claim 1 or 2 , wherein the particulate substance is a fluororesin and / or a silicon resin.   A container for filling a liquid therein, wherein the ventilation filter according to any one of claims 1 to 3 is provided on a part of the container wall.

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