JP2004033924A - Continuous defoaming equipment for paste material - Google Patents

Continuous defoaming equipment for paste material Download PDF

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Publication number
JP2004033924A
JP2004033924A JP2002194849A JP2002194849A JP2004033924A JP 2004033924 A JP2004033924 A JP 2004033924A JP 2002194849 A JP2002194849 A JP 2002194849A JP 2002194849 A JP2002194849 A JP 2002194849A JP 2004033924 A JP2004033924 A JP 2004033924A
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Prior art keywords
paste material
container
defoaming
screen
tank
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JP2002194849A
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JP4199487B2 (en
Inventor
Tsuyoshi Yano
矢野　剛志
Naoto Noguchi
野口　直人
Hiroyoshi Kawai
河合　弘義
Mitsuru Hibino
日比野　充
Yasunori Kamiya
神谷　保徳
Mitsuto Okochi
大河内　光人
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Taiho Kogyo Co Ltd
Toyota Motor Corp
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Taiho Kogyo Co Ltd
Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous defoaming equipment for paste material capable of carrying out a defoaming treatment for a paste material by a continuous process. <P>SOLUTION: A predetermined amount of the paste material before defoaming is fed from a midway tank 112 to a container 10. The fed paste material is scraped off while pressing it to a screen 12 while the container 10 and a finish article tank 18 are made to a reduced pressure by a vacuum pump 16. Thereby, the defoamed paste material is discharged from a fine pore provided on the screen 12 and is continuously stored in the finish article tank 18 through a discharge pipe 30 and a valve V3. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、ペースト材料の連続脱泡装置の改良に関する。
【０００２】
【従来の技術】
従来より、広い範囲で様々なペースト材料が使用されている。例えば、電池の電極は、集電体に活物質を含有するペースト材料を塗布して製造される。このようなペースト材料は、その製造工程中において気泡が巻き込まれている。このため、この気泡を含んだ状態でペースト材料を集電体に塗布した場合には、電極の活物質層にピンホールやひび割れが発生し、電極の性能が損なわれてしまう。
【０００３】
このような問題を解決するために、従来より真空ポンプで減圧した容器中において、ペースト材料を攪拌ハネで攪拌しながら脱泡したり、或いは遠心真空脱泡等が行われていた。このようなペースト材料の脱泡技術が特開平１１−２１３９９０号公報に開示されている。
【０００４】
【発明が解決しようとする課題】
しかし、上記従来のペースト材料の脱泡方法においては、バッチ処理によりペースト材料の脱泡処理が行われており、バッチ処理のロット間でのペースト材料の水分量のばらつきが大きくなって、ペースト材料を集電体に塗布して電極を構成する場合に、電極の品質のばらつきが大きい等の問題があった。
【０００５】
また、バッチ処理となるので各ペースト材料のロット毎に在庫時間が異なるので、これによってもペースト材料への含有水分量のばらつきが大きくなるという問題もあった。
【０００６】
更に、バッチ処理のため脱泡工程、塗布工程等への材料の移動時にペースト材料に異物が混入する可能性も大きかった。
【０００７】
本発明は、上記従来の課題に鑑みなされたものであり、その目的は、連続工程によりペースト材料の脱泡処理を行うことができるペースト材料の連続脱泡装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、本発明は、ペースト材料の連続脱泡装置であって、容器と、容器内を減圧する減圧手段と、容器の内壁を構成するスクリーンと、容器内に設けられ、スクリーンにペースト材料を押しつけつつかき取るかき取り手段と、容器に脱泡前のペースト材料を供給する供給手段と、スクリーンの細孔からかき取り手段によって押し出された脱泡後のペースト材料を連続的に排出する排出手段と、を備えることを特徴とする。
【０００９】
上記構成によれば、かき取り手段によりペースト材料をスクリーンに押しつけることにより、スクリーンの細孔から押し出された脱泡後のペースト材料を連続的に排出することができるので、ペースト材料の連続的な脱泡処理を行うことができる。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態（以下実施形態という）を、図面に従って説明する。
【００１１】
図１には、本発明に係るペースト材料の連続脱泡装置を使用したペースト材料の製造工程の説明図が示される。図１において、予備タンク１００に原材料を投入し、攪拌機１０２によって投入した原材料を攪拌し、荒混練が行われる。予備タンク１００に投入される原材料は、例えば電池電極用のペースト材料を製造する場合には、直径２〜３ｍｍ程度の活性炭と直径１ｍｍ程度のカーボンブラックと粉体のセルロース系増粘材（ＭＣ，ＣＭＣ）と水である。
【００１２】
上記荒混練された原材料は、モーノポンプ１０４により混練機１０６に供給される。この混練機１０６では、回転軸によって回転されるリング１０８により原材料が混練機１０６の内壁と擦られることによって粉砕、混練される。これにより、原材料は直径４〜５μｍ程度まで粉砕され、ペースト材料となる。この混練機１０６にはモーノポンプ１０４から連続的に荒混練された原材料が供給され、混練機１０６によって粉砕されたペースト材料が混練機１０６の上部よりクーラー１１０、バルブＶ１を介して中間タンク１１２に供給される。中間タンク１１２に供給されたペースト材料には、脱泡前であるので大量の気泡が含まれている。
【００１３】
中間タンク１１２からは、脱泡前のペースト材料がバルブＶ２を介して本発明に係るペースト材料の連続脱泡装置を構成する容器１０に供給される。容器１０の内部には、多数の細孔が形成されたスクリーン１２が設けられており、このスクリーン１２により容器１０の内壁が構成されている。また、容器内には、本発明に係るかき取り手段に相当するスクレーパ１４が設けられている。このスクレーパ１４は、モータ（Ｍ）により回転され、容器１０に供給されたペースト材料をスクリーン１２に押しつけつつかき取る機能を有する。
【００１４】
また、容器１０には、本発明の減圧手段に相当する真空ポンプ１６がバルブＶ４を介して接続されており、これにより容器１０内が減圧される。
【００１５】
更に、容器１０には、容器１０から排出される脱泡後のペースト材料を受け取るための完成品タンク１８がバルブＶ３、排出管３０を介して接続されている。
【００１６】
中間タンク１１２から容器１０に脱泡前のペースト材料を供給する場合には、バルブＶ２、Ｖ３、Ｖ４を開とし、バルブＶ５を閉として、真空ポンプ１６により容器１０および完成品タンク１８内を減圧状態としながらペースト材料の供給が行われる。この場合、中間タンク１１２から容器１０に供給されるペースト材料の供給量は、例えば容器１０または中間タンク１１２にレベル監視装置１１４を設けておき、これにより中間タンク１１２から所定量のペースト材料を供給する構成としてもよい。また、中間タンク１１２から容器１０へのペースト材料の供給量は、他の計量装置を使用することもできる。これにより、中間タンク１１２から容器１０に所定量のペースト材料を供給することが可能となる。この中間タンク１１２、バルブＶ２、レベル監視装置１１４により、本発明に係る供給手段が構成される。
【００１７】
図２には、図１に示されたスクリーン１２、スクレーパ１４の部分断面図が示される。図２において、容器１０に供給されたペースト材料２０には、気泡２２が含まれている。このようなペースト材料２０は、スクレーパ１４によりスクリーン１２に押しつけられつつかき取られる。このかき取り動作中にペースト材料２０がスクリーン１２に形成された細孔２４から押し出される。この際に、ペースト材料２０に含まれる気泡２２のうち、直径が１００μｍ〜１ｍｍ程度の大きな気泡がつぶされる。また、この際には、上述したとおり、容器１０内が真空ポンプ１６により減圧されており、この場合の圧力は６６５０〜１３３００Ｐａ（５０〜１００トール）程度とされているので、ペースト材料２０に含まれる気泡２２の径を常圧時よりも大きくでき、スクリーン１２とスクレーパ１４とにより気泡２２をつぶしやすくする事が出来る。
【００１８】
また、スクレーパ１４によってかき取り動作を行うことにより、高粘度でかつチクソ性のあるペースト材料を常に流動化することができ、過大な剪断力がスクレーパ１４にかかることを回避することができる。
【００１９】
なお、上記スクリーン１２の細孔２４は、その径が２０〜４００μｍ程度とするのが好適である。径が２０μｍより小さくなるとペースト材料２０が詰まりやすくなり、４００μｍより大きくなると、気泡をつぶす効果が小さくなってしまう。スクレーパ１４の回転速度は、ペースト材料の脱泡処理量やペースト材料の粘度により決定されるが、５ｒｐｍ〜３００ｒｐｍの範囲とするのが好適である。
【００２０】
以上のようにして、スクレーパ１４によりスクリーン１２の細孔２４から押し出されたペースト材料２０は、バックアッププレート２６の開口部２８から連続的に排出される。
【００２１】
開口部２８から排出された脱泡後のペースト材料は、容器１０に接続された排出管３０とバルブＶ３を介して完成品タンク１８に貯められていく。この場合の排出管３０、バルブＶ３、完成品タンク１８が本発明に係る排出手段に相当する。この場合、容器１０のみならず排出管３０、完成品タンク１８も真空ポンプ１６により６６５０〜１３３００Ｐａ（５０〜１００トール）程度に減圧されているので、容器１０から排出されたペースト材料中に含まれる直径１００μｍ以下の小さな気泡も脱泡することができる。
【００２２】
以上のように、本実施形態にかかる脱泡装置では、容器１０から完成品タンク１８に連続的にペースト材料が排出されてくるので、バッチ処理の場合に比べて水分量のばらつきを低く抑えることができる。また、予備タンク１００から完成品タンク１８までを閉回路とする事が出来るので、異物の浸入を回避できる。
【００２３】
図３には、所定のシリンダに脱泡後のペースト材料を入れ、シリンダ内を減圧していった場合に、シリンダ内のペースト材料の粉面の高さが３％上昇する圧力が示される。この圧力が高いほど含有される気泡が多いことになる。図３において、横軸には、中間タンク１１２の内容物（Ａ）、真空ポンプ１６による減圧を行わない場合の容器１０からの排出製品（Ｂ）、真空ポンプ１６による減圧を行った場合の容器１０からの排出製品（Ｃ）がそれぞれ示される。また縦軸は、シリンダの減圧圧力が示される。なお、縦軸に示される４０×１０２Ｐａは、３０℃における飽和空気圧である。図３に示されるように、容器１０内のペースト材料を真空ポンプ１６で減圧しつつスクレーパ１４でかき落とす処理を行うことにより、ペースト材料を極めて良く脱泡することができる。
【００２４】
【発明の効果】
以上説明したように、本発明によれば、真空ポンプで減圧にしつつスクレーパによりペースト材料をスクリーンに押しつけ、スクリーンに形成された細孔を通過させることによりペースト材料中に含まれる気泡をつぶすことができると共に、微細な気泡は真空ポンプにより除去することができる。これにより、連続的に、かつ高い効率でペースト材料の脱泡処理を行うことができる。
【図面の簡単な説明】
【図１】本発明に係るペースト材料の連続脱泡装置を使用したペースト材料の生産工程を示す図である。
【図２】図１に示されたスクリーン及びスクレーパの部分断面図である。
【図３】本発明に係る連続脱泡装置の脱泡効果を示す図である。
【符号の説明】
１０　容器、１２　スクリーン、１４　スクレーパ、１６　真空ポンプ、１８完成品タンク、２０　ペースト材料、２２　気泡、２４　細孔、２６　バックアッププレート、２８　開口部、１００　予備タンク、１０２　攪拌機、１０４モーノポンプ、１０６　混練機、１０８　リング、１１０　クーラー、１１２中間タンク、１１４　レベル監視装置。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a continuous defoaming device for a paste material.
[0002]
[Prior art]
Conventionally, various paste materials have been used in a wide range. For example, an electrode of a battery is manufactured by applying a paste material containing an active material to a current collector. In such a paste material, air bubbles are involved during the manufacturing process. For this reason, when the paste material is applied to the current collector in a state containing the bubbles, pinholes and cracks are generated in the active material layer of the electrode, and the performance of the electrode is impaired.
[0003]
In order to solve such a problem, conventionally, in a container depressurized by a vacuum pump, defoaming or a centrifugal vacuum defoaming of the paste material is performed while stirring the paste material with a stirring splash. Such a defoaming technique for the paste material is disclosed in JP-A-11-21390.
[0004]
[Problems to be solved by the invention]
However, in the conventional paste material defoaming method, the paste material is defoamed by a batch process, and the variation in the water content of the paste material between batches of the batch process increases, and the paste material defoams. Is applied to a current collector to form an electrode, there is a problem that the quality of the electrode varies greatly.
[0005]
Further, since the batch processing is performed, the stock time differs for each lot of the paste material, and this also causes a problem that the variation in the water content in the paste material becomes large.
[0006]
Furthermore, there is a great possibility that foreign matter may be mixed into the paste material when the material is transferred to the defoaming step, the coating step, or the like due to the batch processing.
[0007]
The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a continuous paste material defoaming apparatus capable of performing a paste material defoaming process in a continuous process.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a continuous defoaming device for a paste material, a container, a decompression means for reducing the pressure in the container, a screen constituting an inner wall of the container, and provided in the container, The scraping means for scraping the paste material against the screen, the supply means for supplying the paste material before defoaming to the container, and the paste material after defoaming extruded by the scraping means from the pores of the screen continuously. And a discharging means for discharging the water.
[0009]
According to the above configuration, by pressing the paste material against the screen by the scraping means, it is possible to continuously discharge the defoamed paste material extruded from the pores of the screen. Defoaming treatment can be performed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention (hereinafter, referred to as embodiments) will be described with reference to the drawings.
[0011]
FIG. 1 is an explanatory diagram of a process for producing a paste material using the paste material continuous defoaming apparatus according to the present invention. In FIG. 1, raw materials are charged into a spare tank 100, and the raw materials are stirred by a stirrer 102 to perform rough kneading. Raw materials to be put into the preliminary tank 100 are, for example, in the case of producing a paste material for a battery electrode, activated carbon having a diameter of about 2 to 3 mm, carbon black having a diameter of about 1 mm, and a powdered cellulose-based thickener (MC, CMC) and water.
[0012]
The raw material that has been roughly kneaded is supplied to a kneader 106 by a mono pump 104. In the kneader 106, the raw material is crushed and kneaded by being rubbed against the inner wall of the kneader 106 by a ring 108 rotated by a rotating shaft. As a result, the raw material is pulverized to a diameter of about 4 to 5 μm, and becomes a paste material. Raw materials that are continuously roughly kneaded are supplied to the kneader 106 from a mono pump 104, and the paste material pulverized by the kneader 106 is supplied from above the kneader 106 to an intermediate tank 112 via a cooler 110 and a valve V1. Is done. The paste material supplied to the intermediate tank 112 contains a large amount of air bubbles since it is before defoaming.
[0013]
The paste material before defoaming is supplied from the intermediate tank 112 to the container 10 constituting the continuous defoaming device for paste material according to the present invention via the valve V2. A screen 12 having a large number of pores is provided inside the container 10, and the screen 12 forms an inner wall of the container 10. In addition, a scraper 14 corresponding to a scraping means according to the present invention is provided in the container. The scraper 14 is rotated by a motor (M) and has a function of scraping the paste material supplied to the container 10 while pressing the paste material against the screen 12.
[0014]
Further, a vacuum pump 16 corresponding to a decompression means of the present invention is connected to the container 10 via a valve V4, whereby the pressure in the container 10 is reduced.
[0015]
Further, a finished product tank 18 for receiving the defoamed paste material discharged from the container 10 is connected to the container 10 via a valve V3 and a discharge pipe 30.
[0016]
When supplying the paste material before defoaming from the intermediate tank 112 to the container 10, the valves V2, V3, and V4 are opened, the valve V5 is closed, and the pressure in the container 10 and the finished product tank 18 is reduced by the vacuum pump 16. The paste material is supplied while the state is maintained. In this case, the supply amount of the paste material supplied from the intermediate tank 112 to the container 10 is, for example, provided with a level monitoring device 114 in the container 10 or the intermediate tank 112 so that a predetermined amount of the paste material is supplied from the intermediate tank 112. It is good also as a structure which performs. Further, the supply amount of the paste material from the intermediate tank 112 to the container 10 can use another measuring device. This makes it possible to supply a predetermined amount of the paste material from the intermediate tank 112 to the container 10. The intermediate tank 112, the valve V2, and the level monitoring device 114 constitute a supply unit according to the present invention.
[0017]
FIG. 2 shows a partial sectional view of the screen 12 and the scraper 14 shown in FIG. In FIG. 2, the paste material 20 supplied to the container 10 contains bubbles 22. Such a paste material 20 is scraped while being pressed against the screen 12 by the scraper 14. During this scraping operation, the paste material 20 is extruded from the pores 24 formed in the screen 12. At this time, among the bubbles 22 included in the paste material 20, large bubbles having a diameter of about 100 μm to 1 mm are crushed. At this time, as described above, the pressure in the container 10 is reduced by the vacuum pump 16 and the pressure in this case is about 6650 to 13300 Pa (50 to 100 Torr). The diameter of the bubble 22 can be made larger than at normal pressure, and the bubble 22 can be easily crushed by the screen 12 and the scraper 14.
[0018]
Further, by performing the scraping operation by the scraper 14, the paste material having a high viscosity and a thixotropic property can be constantly fluidized, and it is possible to avoid applying an excessive shearing force to the scraper 14.
[0019]
The diameter of the pores 24 of the screen 12 is preferably about 20 to 400 μm. When the diameter is smaller than 20 μm, the paste material 20 is easily clogged, and when the diameter is larger than 400 μm, the effect of crushing bubbles is reduced. The rotation speed of the scraper 14 is determined by the amount of defoaming of the paste material and the viscosity of the paste material, and is preferably in the range of 5 rpm to 300 rpm.
[0020]
As described above, the paste material 20 extruded from the fine holes 24 of the screen 12 by the scraper 14 is continuously discharged from the opening 28 of the backup plate 26.
[0021]
The defoamed paste material discharged from the opening 28 is stored in the finished product tank 18 via the discharge pipe 30 connected to the container 10 and the valve V3. The discharge pipe 30, the valve V3, and the finished product tank 18 in this case correspond to the discharge means according to the present invention. In this case, not only the container 10 but also the discharge pipe 30 and the finished product tank 18 are reduced in pressure to about 6650 to 13300 Pa (50 to 100 Torr) by the vacuum pump 16, and thus are included in the paste material discharged from the container 10. Even small bubbles having a diameter of 100 μm or less can be removed.
[0022]
As described above, in the defoaming apparatus according to the present embodiment, since the paste material is continuously discharged from the container 10 to the finished product tank 18, it is possible to suppress the variation in the amount of water to be lower than in the case of batch processing. Can be. Further, since the circuit from the spare tank 100 to the finished product tank 18 can be closed, foreign matter can be prevented from entering.
[0023]
FIG. 3 shows the pressure at which the height of the powder surface of the paste material in the cylinder rises by 3% when the degassed paste material is put into a predetermined cylinder and the inside of the cylinder is depressurized. The higher the pressure, the more bubbles are contained. In FIG. 3, the horizontal axis represents the content (A) of the intermediate tank 112, the product (B) discharged from the container 10 when the vacuum pump 16 is not depressurized, and the container when the pressure is depressurized by the vacuum pump 16. Discharged products (C) from 10 are respectively shown. The vertical axis indicates the reduced pressure of the cylinder. Note that 40 × 10 2 Pa shown on the vertical axis is the saturated air pressure at 30 ° C. As shown in FIG. 3, by performing a process of scraping off the paste material in the container 10 with the scraper 14 while reducing the pressure with the vacuum pump 16, the paste material can be defoamed extremely well.
[0024]
【The invention's effect】
As described above, according to the present invention, the paste material is pressed against the screen by the scraper while the pressure is reduced by the vacuum pump, and bubbles contained in the paste material are crushed by passing through the pores formed in the screen. At the same time, fine bubbles can be removed by a vacuum pump. Thereby, the defoaming treatment of the paste material can be performed continuously and with high efficiency.
[Brief description of the drawings]
FIG. 1 is a diagram showing a paste material production process using a continuous paste material defoaming apparatus according to the present invention.
FIG. 2 is a partial sectional view of a screen and a scraper shown in FIG.
FIG. 3 is a view showing a defoaming effect of the continuous defoaming device according to the present invention.
[Explanation of symbols]
Reference Signs List 10 container, 12 screen, 14 scraper, 16 vacuum pump, 18 finished product tank, 20 paste material, 22 bubbles, 24 pores, 26 backup plate, 28 opening, 100 spare tank, 102 stirrer, 104 mono pump, 106 kneader , 108 ring, 110 cooler, 112 intermediate tank, 114 level monitor.

Claims (1)

容器と、
前記容器内を減圧する減圧手段と、
前記容器の内壁を構成するスクリーンと、
前記容器内に設けられ、前記スクリーンにペースト材料を押しつけつつかき取るかき取り手段と、
前記容器に脱泡前のペースト材料を供給する供給手段と、
前記スクリーンの細孔から前記かき取り手段によって押し出された脱泡後のペースト材料を連続的に排出する排出手段と、
を備えることを特徴とするペースト材料の連続脱泡装置。A container,
Decompression means for decompressing the inside of the container,
A screen constituting an inner wall of the container,
Scraping means provided in the container, scraping while pressing the paste material against the screen,
Supply means for supplying a paste material before defoaming to the container,
Discharging means for continuously discharging the defoamed paste material extruded by the scraping means from the pores of the screen,
A continuous defoaming device for a paste material, comprising:
JP2002194849A 2002-07-03 2002-07-03 Continuous defoaming device for paste material Expired - Fee Related JP4199487B2 (en)

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JP2010182485A (en) * 2009-02-04 2010-08-19 Toyota Motor Corp Method and device for manufacturing slurry for electrode
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