JP4049342B2 - Degassing method of coating liquid - Google Patents
Degassing method of coating liquid Download PDFInfo
- Publication number
- JP4049342B2 JP4049342B2 JP27743697A JP27743697A JP4049342B2 JP 4049342 B2 JP4049342 B2 JP 4049342B2 JP 27743697 A JP27743697 A JP 27743697A JP 27743697 A JP27743697 A JP 27743697A JP 4049342 B2 JP4049342 B2 JP 4049342B2
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- Prior art keywords
- coating liquid
- ultrasonic
- membrane
- liquid
- deaerator
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0021—Degasification of liquids by bringing the liquid in a thin layer
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Physical Water Treatments (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、塗工液等の溶存気体を除去する塗工液の脱気方法に関するものである。
【０００２】
【従来の技術】
溶存気体量の多い塗工液は、塗布中に塗布機において気泡が発生し易く、発生した気泡は筋やハジキ故障の原因となる。したがって、塗工液を塗布機に送る前に、塗工液中の溶存気体を除去しておく必要があり、この塗工液の溶存気体を除去する方法としては、例えば、膜脱気装置を使用して行っていた。
【０００３】
また、液体中の溶存気体、気泡等を除去する手段としては種々提案されており、例えば、特公昭５５−６４０５号公報には、超音波発振器から発振された超音波振動を被脱泡液に与え、被脱泡液中の気泡を液中に溶解、消滅させるとともに大気圧下での気泡の析出を防止する超音波脱泡方法が提案されている。
【０００４】
特開昭６１−５０６０８号公報には、被脱泡液導入管及び脱泡槽に超音波を作用させる超音波発生器を設けた超音波脱泡装置が提案されている。特開昭５９−９２００３号公報には、超音波振動子を管体の中心に向けて周方向に配置してなる超音波照射装置を用いてハロゲン化乳剤に超音波を照射する超音波脱泡方法が提案されている。特開昭５９−１５６４０５号公報には、導入管を流れる被脱泡液に高エネルギーの超音波を照射するとともに、脱泡槽内の被脱泡液に低エネルギーの超音波を照射する超音波脱泡方法が提案されている。
【０００５】
【発明が解決しようとする課題】
しかしながら、塗工液を膜脱気装置で脱気する時、脱気能力が低いと溶存気体量の多い塗工液が塗布機へ送液されてしまう。この時、脱気装置を大きくすれば脱気能力が確保でき溶存気体量を少なくできるが、その分液ロス量が多くなってしまうものであった。
【０００６】
また、特公昭５５−６４０５号公報で提案された超音波脱泡技術は、超音波発振を利用して液中に泡を溶解させて脱気するもので、膜脱気装置において溶存気体を塗工液中から除去することには適用できなかった。
【０００７】
特開昭６１−５０６０８号公報、特開昭５９−９２００３号公報及び特開昭５９−１５６４０５号公報で提案された技術は、超音波発振により微細泡を大きな泡にし、浮上分離により脱泡するものである。したがって、膜脱気装置のように密封系の装置においては適用できなかった。
【０００８】
本発明は、以上の問題点を解決するためになされたもので、膜脱気装置を通過している塗工液に超音波振動を与えることにより、溶存気体の拡散を促進させて、脱気能力を向上させるようにした塗工液の脱気方法を提供することを目的とする。
【０００９】
本発明の塗工液の脱気方法は、超音波伝播用液体が満たされた超音波液槽内に設けられたものであって、塗工液が導入される導入配管、溶存気体が除去された塗工液が排出される排出配管及び減圧するための真空ポンプが連結され、かつ減圧圧力が３０ｔｏｒｒ以下である膜脱気装置及び膜脱気装置を通過中の塗工液に周波数が１０〜６０ＫＨｚである超音波振動を与えて、膜脱気装置の膜を透過中の気体の透過を促進させるとともに塗工液中の溶存気体の分離を促進させることを特徴として構成されている。
【００１０】
また、本発明の塗工液の脱気方法は、脱気装置本体内部に設けた超音波発振子により、塗工液が導入される導入配管、溶存気体が除去された塗工液が排出される排出配管及び減圧するための真空ポンプが連結され、かつ減圧圧力が３０ｔｏｒｒ以下である膜脱気装置及び膜脱気装置を通過中の塗工液に周波数が１０〜６０ＫＨｚである超音波振動を与えて、膜脱気装置の膜を透過中の気体の透過を促進させるとともに塗工液中の溶存気体の分離を促進させることを特徴として構成されている。
【００１１】
本発明の塗工液の脱気方法においては、超音波発振器が超音波伝播用液体を介して膜脱気装置を超音波振動させることにより、膜脱気装置の膜を透過中の気体の透過を促進させ、また、膜脱気装置を通過中の塗工液を超音波振動させることにより、塗工液中からの溶存気体の分離を促進させる。
【００１２】
【発明の実施の形態】
塗工液は、水系塗工液、有機溶剤系塗工液等、特に限定されるものでなく、どちらにも効果的である。
【００１３】
超音波の周波数は、１０ＫＨｚ〜６０ＫＨｚの範囲が好ましく、２８ＫＨｚ前後がより好ましい。また、出力は、１００Ｗ〜５００Ｗの範囲が好ましく、１００Ｗ〜２００Ｗの範囲がより好ましい。
【００１４】
膜脱気装置の減圧圧力としては、好ましくは３０ｔｏｒｒ以下、より好ましくは１０ｔｏｒｒ以下である。
【００１５】
また、脱気装置本体内部に超音波発振子を設け、塗布液に直接超音波振動をかけてもよい。
【００１６】
本発明による塗工液の脱気方法に用いる脱気装置の一例を図面を参照して説明する。
【００１７】
図１は、脱気装置の概略模式図である。この図において、１は塗工液を貯溜しておく塗工液タンクで、この塗工液タンク１は導入配管２を介して膜脱気装置３に連結されている。４は超音波液槽としての水槽で、この水槽４内には超音波伝播用液体としての水５が充填されており、この水槽４の中に水５に浸かった状態で膜脱気装置３が配置されている。
【００１８】
また、水槽４には、膜脱気装置３及び膜脱気装置３を通過中の塗工液に超音波振動を与える超音波発振器６が設けられており、この超音波発振器６は、発振器本体７と水槽４の底部に配置された超音波振動子８とで構成されている。
【００１９】
なお、９は膜脱気装置３を減圧するための真空ポンプ、１０は溶存気体が除去された塗工液が次の工程へ送られる排出配管であり、１１は塗工液を膜脱気装置３へ送り込む送液ポンプである。
【００２０】
このような塗工液の脱気装置においては、送液ポンプ１１により導入配管２を介して塗工液を膜脱気装置３へ送る。膜脱気装置３は、水５を介して超音波振動子８により超音波振動され、膜を透過中の気体の透過が促進され、また、膜脱気装置３中の塗工液は超音波振動され、溶存気体の分離が促進される。
【００２１】
【実施例】
図１に示す塗工液の脱気装置を用いて塗工液の脱気を行った。
【００２２】
〈送液条件〉
塗 工 液：有機溶剤系塗工液
減圧圧力 ：１０ｔｏｒｒ（膜脱気装置）
使 用 液：水系塗工液
送 液 量：６００ｃｃ／分
ポ ン プ：ギアポンプ
超音波発振：２８ＫＨＺ、３００Ｗ
〈結果〉
溶存酸素残存率（％）を表１に示す。
【００２３】
【表１】
溶存酸素残存率（％）の値が小さい方がより脱気されていることを意味する。
【００２５】
以上の結果、超音波発振することで７．８％残存率が下がる（脱気され易くなる）ことが解る。
【００２６】
なお、脱気装置本体内部に超音波発振子を設け、塗工液に直接振動をかけた場合には同様の条件で溶存酸素残存率の減少は７％であった。
【００２７】
【発明の効果】
本発明は、塗工液の溶存気体を効率よく除去することができ、その結果、脱気装置のサイズを小型化することができるとともに、液ロス量も削減することができる。
【図面の簡単な説明】
【図１】 本発明による塗工液の脱気方法に用いる脱気装置の一例の概略模式図である。
【符号の説明】
１ 塗工液タンク
２ 導入配管
３ 膜脱気装置
４ 水槽（超音波液槽）
５ 水（超音波伝播用液体）
６ 超音波発振器
７ 発振器本体
８ 超音波振動子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating liquid degassing method for removing dissolved gas such as a coating liquid.
[0002]
[Prior art]
A coating solution having a large amount of dissolved gas is liable to generate bubbles in the coating machine during application, and the generated bubbles may cause streak and repelling failure. Therefore, before sending the coating liquid to the coating machine, it is necessary to remove the dissolved gas in the coating liquid. As a method for removing the dissolved gas in the coating liquid, for example, a membrane deaerator is used. Was going to use.
[0003]
Various means for removing dissolved gas, bubbles and the like in the liquid have been proposed. For example, Japanese Patent Publication No. 55-6405 discloses ultrasonic vibration generated from an ultrasonic oscillator as a liquid to be removed. There has been proposed an ultrasonic defoaming method in which bubbles in a liquid to be defoamed are dissolved and disappeared in the liquid and precipitation of bubbles under atmospheric pressure is prevented.
[0004]
Japanese Patent Application Laid-Open No. 61-50608 proposes an ultrasonic defoaming apparatus provided with an ultrasonic generator for applying ultrasonic waves to a defoamed liquid introducing tube and a defoaming tank. Japanese Laid-Open Patent Publication No. 59-92003 discloses ultrasonic defoaming in which ultrasonic waves are radiated to a halogenated emulsion using an ultrasonic irradiation device in which an ultrasonic transducer is arranged in the circumferential direction toward the center of a tube body. A method has been proposed. Japanese Patent Application Laid-Open No. 59-156405 discloses ultrasonic waves that irradiate the defoamed liquid flowing through the introduction pipe with high energy ultrasonic waves and irradiate the defoamed liquid in the defoaming tank with low energy ultrasonic waves. Defoaming methods have been proposed.
[0005]
[Problems to be solved by the invention]
However, when the coating liquid is degassed by the membrane deaerator, if the degassing capacity is low, the coating liquid having a large amount of dissolved gas is fed to the coating machine. At this time, if the deaeration device is enlarged, the deaeration capability can be secured and the amount of dissolved gas can be reduced, but the amount of liquid separation loss increases.
[0006]
In addition, the ultrasonic defoaming technique proposed in Japanese Patent Publication No. 55-6405 is a technique for degassing by dissolving bubbles in a liquid using ultrasonic oscillation. It was not applicable to removing from the working liquid.
[0007]
The techniques proposed in Japanese Patent Application Laid-Open Nos. 61-50608, 59-92003 and 59-156405 make fine bubbles into large bubbles by ultrasonic oscillation and degass them by floating separation. Is. Therefore, it cannot be applied to a sealed apparatus such as a membrane deaerator.
[0008]
The present invention has been made to solve the above-described problems. By applying ultrasonic vibration to the coating liquid passing through the membrane degassing apparatus, the diffusion of dissolved gas is promoted and the degassing is performed. It is an object of the present invention to provide a method for degassing a coating liquid with improved performance.
[0009]
The coating liquid degassing method of the present invention is provided in an ultrasonic liquid tank filled with an ultrasonic wave propagation liquid , and the introduction pipe into which the coating liquid is introduced and the dissolved gas are removed. A discharge pipe through which the coating liquid is discharged and a vacuum pump for reducing pressure are connected, and the frequency of the coating liquid passing through the membrane deaerator and the membrane deaerator having a reduced pressure of 30 torr or less is 10 to 10. Ultrasonic vibration of 60 KHz is applied to promote the permeation of gas passing through the membrane of the membrane deaerator and to promote the separation of dissolved gas in the coating liquid.
[0010]
Further, in the degassing method of the coating liquid of the present invention, the introduction pipe into which the coating liquid is introduced and the coating liquid from which the dissolved gas is removed are discharged by the ultrasonic oscillator provided inside the degassing apparatus main body. And a vacuum pump for depressurizing, and a membrane deaerator having a depressurized pressure of 30 torr or less, and an ultrasonic vibration having a frequency of 10-60 KHz in the coating liquid passing through the membrane deaerator. Given, it is characterized by promoting the permeation of the gas passing through the membrane of the membrane deaerator and promoting the separation of the dissolved gas in the coating liquid.
[0011]
In the degassing method of the coating liquid of the present invention, the ultrasonic oscillator vibrates the membrane deaerator ultrasonically through the ultrasonic wave propagation liquid, thereby allowing the gas passing through the membrane of the membrane deaerator to permeate. Further, the separation of dissolved gas from the coating liquid is promoted by ultrasonically vibrating the coating liquid passing through the membrane deaerator.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The coating liquid is not particularly limited, such as a water-based coating liquid and an organic solvent-based coating liquid, and both are effective.
[0013]
The ultrasonic frequency is preferably in the range of 10 KHz to 60 KHz, and more preferably around 28 KHz. The output is preferably in the range of 100W to 500W, more preferably in the range of 100W to 200W.
[0014]
The reduced pressure of the membrane deaerator is preferably 30 torr or less, more preferably 10 torr or less.
[0015]
Further, an ultrasonic oscillator may be provided inside the deaerator main body, and ultrasonic vibration may be directly applied to the coating solution.
[0016]
An example of the deaeration apparatus used for the deaeration method of the coating liquid by this invention is demonstrated with reference to drawings.
[0017]
FIG. 1 is a schematic diagram of a deaeration device. In this figure,
[0018]
The water tank 4 is provided with a
[0019]
In addition, 9 is a vacuum pump for depressurizing the
[0020]
In such a coating liquid deaeration apparatus, the coating liquid is sent to the
[0021]
【Example】
The coating liquid was degassed using the coating liquid degassing apparatus shown in FIG.
[0022]
<Liquid feeding conditions>
Coating liquid: Organic solvent-based coating liquid, reduced pressure: 10 torr (membrane degassing device)
Working liquid: Aqueous coating liquid feed Amount: 600cc / min Pump: Gear pump ultrasonic oscillation: 28KHZ, 300W
<result>
Table 1 shows the dissolved oxygen residual ratio (%).
[0023]
[Table 1]
It means that the one where the value of dissolved oxygen residual rate (%) is smaller is deaerated more.
[0025]
As a result of the above, it can be seen that the ultrasonic wave oscillation lowers the residual rate by 7.8% (easy to be deaerated).
[0026]
When an ultrasonic oscillator was provided inside the deaerator main body and the coating liquid was directly vibrated, the decrease in the dissolved oxygen remaining rate was 7% under the same conditions.
[0027]
【The invention's effect】
The present invention can efficiently remove dissolved gas from the coating liquid, and as a result, the size of the deaeration device can be reduced and the amount of liquid loss can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an example of a degassing device used in a coating liquid degassing method according to the present invention.
[Explanation of symbols]
1 Coating liquid tank 2
5 Water (liquid for ultrasonic wave propagation)
6 Ultrasonic oscillator 7 Oscillator body 8 Ultrasonic vibrator
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27743697A JP4049342B2 (en) | 1997-10-09 | 1997-10-09 | Degassing method of coating liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27743697A JP4049342B2 (en) | 1997-10-09 | 1997-10-09 | Degassing method of coating liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11114308A JPH11114308A (en) | 1999-04-27 |
| JP4049342B2 true JP4049342B2 (en) | 2008-02-20 |
Family
ID=17583546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27743697A Expired - Fee Related JP4049342B2 (en) | 1997-10-09 | 1997-10-09 | Degassing method of coating liquid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4049342B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2819424A1 (en) * | 2001-01-17 | 2002-07-19 | Francois Quiviger | Continuous degassing system, for liquids under pressure, uses ultrasound resonator to form gas bubbles |
| US6939392B2 (en) | 2003-04-04 | 2005-09-06 | United Technologies Corporation | System and method for thermal management |
| DE102013209108A1 (en) * | 2013-05-16 | 2014-11-20 | Robert Bosch Gmbh | hydraulic power unit |
| GB2601489B (en) | 2020-12-01 | 2024-01-17 | Agilent Technologies Inc | Vaccum degassing using electroactive material |
| CN115555342A (en) * | 2022-09-23 | 2023-01-03 | 北韵新材料科技(上海)有限公司 | A vacuum vibration defoaming soaking treatment device |
| WO2024246754A1 (en) * | 2023-05-30 | 2024-12-05 | Ecobox Limited | Apparatus and method for degassing fluids |
-
1997
- 1997-10-09 JP JP27743697A patent/JP4049342B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11114308A (en) | 1999-04-27 |
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