JPS62132977A - Concentration of water-dispersible varnish - Google Patents
Concentration of water-dispersible varnishInfo
- Publication number
- JPS62132977A JPS62132977A JP60273000A JP27300085A JPS62132977A JP S62132977 A JPS62132977 A JP S62132977A JP 60273000 A JP60273000 A JP 60273000A JP 27300085 A JP27300085 A JP 27300085A JP S62132977 A JPS62132977 A JP S62132977A
- Authority
- JP
- Japan
- Prior art keywords
- varnish
- water
- dispersible
- ultrafiltration membrane
- concentration
- Prior art date
- 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.)
- Granted
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電着塗装に使用することにより樹脂分含有量
の低下した水分散性ワニスの濃縮方法に適したワニス濃
縮方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a varnish concentration method suitable for concentrating a water-dispersible varnish whose resin content has been reduced by use in electrodeposition coating.
従来の技術及び解決を要すべき問題点
水分散性ワニスを用いて電着により導体上に樹脂分を析
出させ１次いで析出樹脂層を焼付けるエナメル絶縁電線
の製造においては、水分散性ワニスは、経時的にその分
散樹脂の含有量が低下していく。樹脂の含有量が低下す
るにつれて電着に要する印加電圧を上昇させる必要があ
るが、印加電圧がある程度高くなるとその後の電着皮膜
の外観や耐電圧強度が悪化する問題がある。このため。Conventional techniques and problems to be solved In the production of enameled insulated wires, in which a water-dispersible varnish is used to deposit a resin component on a conductor by electrodeposition, and then the deposited resin layer is baked, the water-dispersible varnish is The content of the dispersed resin decreases over time. As the resin content decreases, it is necessary to increase the applied voltage required for electrodeposition, but if the applied voltage increases to a certain extent, there is a problem that the appearance and voltage strength of the subsequent electrodeposited film deteriorate. For this reason.
使用中の又は使用ずみの水分散性電着ワニスを濃縮し、
再使用する必要がある。Concentrate the water-dispersible electrodeposition varnish that is in use or has been used,
Must be reused.
水分散性ワニスは、加熱により水分のみを蒸発除去して
濃縮することが可能であるが、この方法は、水の大きな
蒸発潜熱のために蒸発に大きな電気エネルギーを要し不
経済である。Water-dispersible varnish can be concentrated by evaporating only the water content by heating, but this method is uneconomical because it requires a large amount of electrical energy for evaporation due to the large latent heat of vaporization of water.
水分散性ワニスを通常の方法で、すなわち該ワニスを限
外濾過膜に対して直角の方向に流して濾過し、樹脂分を
該膜上に集める方式によっても濃縮が可能である。しか
しながら、この方法で濾過したときは９水分散性フェス
中の樹脂分が一般に極めて微粒であるために、短時間の
うちに限外濾過膜上に堆積した該樹脂分のために濾過抵
抗が過大となって経済的な濾過が困難となる。It is also possible to concentrate the water-dispersible varnish in a conventional manner, that is, by filtering the varnish by flowing it in a direction perpendicular to an ultrafiltration membrane and collecting the resin content on the membrane. However, when filtration is performed using this method, the resin content in the water-dispersible membrane is generally extremely fine, so the filtration resistance becomes excessive due to the resin content deposited on the ultrafiltration membrane in a short period of time. This makes economical filtration difficult.
問題解決の手段
本発明は、限外濾過の応用により、上記の問題を克服し
たものである。SUMMARY OF THE INVENTION The present invention overcomes the above problems through the application of ultrafiltration.
即ち９本発明は、水分散性ワニスを、限外ｉＩｉ過膜に
対して平行方向に流して上記ワニス中の水分を濾過除去
することを特徴とする水分散性ワニスの濃縮方法を提供
するものである。That is, 9 the present invention provides a method for concentrating a water-dispersible varnish, characterized in that the water-dispersible varnish is passed in a direction parallel to an ultra-IIi filtration membrane to filter and remove water in the varnish. It is.
作用
濃縮されるべき水分散性ワニスを、限外濾過膜に対して
平行方向に流すことにより、該ワニス中の樹脂分は限外
濾過膜上に留まることなくワニス流により常に下流に押
し流される。一方、ワニス中の水分は、限外濾過膜を透
過して濾過される。By flowing the water-dispersible varnish to be concentrated in a direction parallel to the ultrafiltration membrane, the resin content in the varnish does not remain on the ultrafiltration membrane, but is constantly swept downstream by the varnish flow. On the other hand, water in the varnish is filtered through an ultrafiltration membrane.
この結果、限外濾過膜上をそれに平行して流れるワニス
は、下流にいくに従ってその樹脂濃度が増大していく、
また上記した通り、樹脂分は限外濾過膜上に留まらず絶
えず下流に押法されるので。As a result, the resin concentration of the varnish flowing parallel to the ultrafiltration membrane increases as it goes downstream.
Furthermore, as mentioned above, the resin does not remain on the ultrafiltration membrane but is constantly pushed downstream.
限外濾過膜の濾過抵抗は、はぼ初期値を保つこととなり
、この結果、長時間の連続した濃縮操業が可能となる。The filtration resistance of the ultrafiltration membrane is maintained at approximately the initial value, and as a result, long-term continuous concentration operation is possible.
限外濾過手段として限外濾過膜からなるチューブ（以下
、限外濾過膜チューブと称す）を用いると、ワニスの輸
送と濃縮とが同時に行える利点がある。When a tube made of an ultrafiltration membrane (hereinafter referred to as an ultrafiltration membrane tube) is used as the ultrafiltration means, there is an advantage that the varnish can be transported and concentrated at the same time.
以下９図面に基づき本発明を説明する。第１図及び第２
図は、いずれも電着塗装法によるエナメル絶縁電線の製
造に本発明を応用した場合の概略図であって、水分散性
の電着ワニス１を満した電着槽２を貫通して銅＆９Ｉ３
を走行させ、この走行の間に銅線３に電着塗装を施す。The present invention will be explained below based on nine drawings. Figures 1 and 2
The figures are schematic diagrams in which the present invention is applied to the production of enamelled insulated wires using the electrodeposition coating method.
is run, and the copper wire 3 is electrocoated during this run.
電着ワニス１を、ポンプ４により汲み揚げ９次いで、限
外濾過膜チューブ５からなる限外濾過器６を通過させ濃
縮して貯蔵タンク８に貯える。１回の上記した通過だけ
では所望の濃縮度に達しない場合しは、を着ワニスｌを
貯蔵タンク８と限外濾過器６との間を必要回数循環させ
るとよい。貯蔵タンク８に貯えられた濃縮ワニスには、
必要に応じて、上記の濃縮過程で水と一緒に濾別された
成分を薬剤補充装置７から補充添加し９次いで電着槽２
に還元する。The electrodeposited varnish 1 is pumped up by a pump 4 and then passed through an ultrafilter 6 consisting of an ultrafiltration membrane tube 5 to be concentrated and stored in a storage tank 8. If the desired concentration cannot be achieved with just one pass as described above, it is advisable to circulate the varnish l between the storage tank 8 and the ultrafilter 6 as many times as necessary. The concentrated varnish stored in the storage tank 8 contains
If necessary, the components filtered together with water in the above concentration process are replenished from the chemical replenishment device 7 and then transferred to the electrodeposition tank 2.
reduce to
第１図の実施例においては、限外濾過器６は。In the embodiment of FIG. 1, the ultrafilter 6 is.
多数本の、たとえば数本〜数十本の、内径１〜２ｃｍ、
長さ約２ｍの限外濾過膜チューブ５を並列に接続した構
造を有し、またポンプ４として回転羽根式の大容器ポン
プが用いられている。A large number of pieces, for example several pieces to several dozen pieces, with an inner diameter of 1 to 2 cm,
It has a structure in which ultrafiltration membrane tubes 5 having a length of about 2 m are connected in parallel, and a rotary vane type large container pump is used as the pump 4.
第２図の実施例においては、限外濾過器６は。In the embodiment of FIG. 2, the ultrafilter 6 is.
内径１〜２ｃｍの短尺限外濾過膜チューブの多数本を縦
続接着した全長約５〜５０ｍの長尺限外濾過膜チューブ
からなっており、ポンプ４としてダイヤフラムポンプが
用いられている。第１図の実施例によるとワニスｌを高
流量、たとえば２００１／分以上、で高速濃縮すること
が可能であり、一方、第２図の実施例は、濃縮速度はや
や遅いが。It consists of a long ultrafiltration membrane tube with a total length of about 5 to 50 m, in which a large number of short ultrafiltration membrane tubes with an inner diameter of 1 to 2 cm are bonded in series, and a diaphragm pump is used as the pump 4. According to the embodiment shown in FIG. 1, it is possible to concentrate the varnish l at high speed at a high flow rate, for example, 200 l/min or more, while in the embodiment shown in FIG. 2, the concentration rate is rather slow.
ワニスｌに大きな剪断力をかけることなく濃縮すること
が可能である。水分散性ワニスによっては輸送ポンプの
回転羽根にて激しく攪拌されたり。It is possible to concentrate the varnish l without applying large shear forces. Some water-dispersible varnishes may be vigorously agitated by the rotating blades of the transport pump.
あるいは高流速で上記チューブ中を輸送されることによ
り、ワニスにかかる大きな剪断力により。Or by the large shear forces exerted on the varnish by being transported through the tube at high flow rates.
あるいは剪断力にもとづくワニス温度の上昇により分散
組織が破壊されてワニス全体が凝集することがある。こ
のような問題のない安定なワニスを高速処理する場合は
、第１図に示す実施例が適しており、凝集し易いワニス
については第２図に示す実施例が適している。ワニスの
凝集を一層確実に避けるには、第２図に示すような装置
（ダイヤフラム式のポンプ及び縦続接続された限外濾過
膜チューブの使用）を用い、しかも限外濾過膜チューブ
内の流量を１５０１／分以下の低流量とすることが好ま
しい。Alternatively, an increase in varnish temperature due to shearing force may destroy the dispersed structure and cause the entire varnish to coagulate. The embodiment shown in FIG. 1 is suitable for high-speed processing of a stable varnish free of such problems, and the embodiment shown in FIG. 2 is suitable for a varnish that tends to aggregate. To more reliably avoid varnish agglomeration, use a device as shown in Figure 2 (using a diaphragm pump and cascaded ultrafiltration membrane tubes), and also reduce the flow rate in the ultrafiltration membrane tubes. It is preferable to use a low flow rate of 1501/min or less.
実施例−１
初期の樹脂ン震度が１５重量％のエポキシ−アクリル系
水分散性ワニスを用いて電着塗装電線の製造を行い、こ
の結果、上記ワニスの樹脂濃度は８重量％に低下した。Example 1 An electrocoated electric wire was manufactured using an epoxy-acrylic water-dispersible varnish with an initial resin seismic intensity of 15% by weight, and as a result, the resin concentration of the varnish was reduced to 8% by weight.
内径１．５ａｏ、長さ２ｍの限外濾過膜チューブを１８
本縦続に接続した濃縮装置（日東電工社製の商品名 日
東ＮＴＵ−２０００−Ｐ １８）にエア駆動のダイヤフ
ラムポンプを用いて上記の濃度低下したエポキシ−アク
リル系水分散性ワニスを濃縮８置入口圧カフｋｇ／ｃｆ
ｆｌ、流量８０１／分で繰り返し流したところ、ワニス
の樹脂濃度は１５重量％に回復した。また、この濃縮に
よってもワニスの凝集は起らなかった。18 ultrafiltration membrane tubes with an inner diameter of 1.5ao and a length of 2m
Using an air-driven diaphragm pump, the epoxy-acrylic water-dispersible varnish with a reduced concentration is concentrated into the concentrator (trade name Nitto NTU-2000-P 18, manufactured by Nitto Denko Corporation) connected in this cascade. Pressure cuff kg/cf
When the varnish was repeatedly flowed at a flow rate of 801/min, the resin concentration of the varnish was restored to 15% by weight. Further, even with this concentration, no aggregation of the varnish occurred.
効果
本発明により、低濃度の水分散性ワニスを低コストで濃
縮することができる。しかも、濃縮の過程において限外
濾過膜は、その濾過抵抗が実質上上昇することがない。Effects According to the present invention, a low concentration water-dispersible varnish can be concentrated at low cost. Moreover, the filtration resistance of the ultrafiltration membrane does not substantially increase during the concentration process.
したがって、長時間にわたって連続的にワニスを濃縮す
ることが可能であるので、限外濾過膜を用いた濾過装置
を連続式の電着塗装装置に設置し、かつ本発明を応用し
て電着槽中のワニスを常に所定の高濃度に維持すること
ができる。また、ａ集し易いワニスについても輸送ポン
プ並びに輸送流量とを選択設定することにより、凝集を
生ぜしめることなく、濃縮を行うことができる。Therefore, since it is possible to continuously concentrate varnish over a long period of time, a filtration device using an ultrafiltration membrane is installed in a continuous electrodeposition coating device, and the present invention is applied to an electrodeposition tank. The varnish inside can always be maintained at a predetermined high concentration. Furthermore, even for varnishes that tend to aggregate, it is possible to concentrate them without causing agglomeration by selecting and setting the transport pump and transport flow rate.
第１図及び第２図は、いずれも電着塗装法によるエナメ
ル絶縁電線に本発明を応用した場合の概略図である。
１： 水分散性のワニス
２： 電着槽
４： ポンプ
５： 限外濾過膜チューブ
６： 限外濾過器
７： 薬剤補充装置
８： 貯蔵タンク1 and 2 are schematic diagrams in which the present invention is applied to an enamel insulated wire formed by electrodeposition coating. 1: Water-dispersible varnish 2: Electrodeposition tank 4: Pump 5: Ultrafiltration membrane tube 6: Ultrafilter 7: Drug replenishment device 8: Storage tank
Claims (1)
流して上記ワニス中の水分を濾 過除去することを特徴とする水分散性ワニ スの濃縮方法。 ２、限外濾過膜からなるチューブ中を水分散性ワニスを
通過させる特許請求の範囲第１ 項に記載の濃縮方法。 ３、水分散性ワニスをダイヤフラムポンプにより内径１
〜２ｃｍのチューブに供給し、かつ１５０ｌ／分以下の
低流量で上記チュー ブ中を通過させる特許請求の範囲第１項乃 至第２項に記載の濃縮方法。 ４、水分散性ワニスが、電着用のワニスである特許請求
の範囲第１項乃至第３項に記載 の濃縮方法。 ５、水分散性ワニスがエポキシ−アクリル系ワニスであ
る特許請求の範囲第１項乃至第 ４に記載の濃縮方法。[Scope of Claims] 1. A method for concentrating a water-dispersible varnish, which comprises flowing the water-dispersible varnish in a direction parallel to an ultrafiltration membrane to remove water in the varnish by filtration. 2. The concentration method according to claim 1, wherein the water-dispersible varnish is passed through a tube made of an ultrafiltration membrane. 3. Apply water-dispersible varnish to an inner diameter of 1 using a diaphragm pump.
3. The method of concentration according to claim 1, wherein the method is supplied to a tube of ~2 cm and passed through the tube at a low flow rate of 150 l/min or less. 4. The concentration method according to claims 1 to 3, wherein the water-dispersible varnish is a varnish for electrodeposition. 5. The concentration method according to claims 1 to 4, wherein the water-dispersible varnish is an epoxy-acrylic varnish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60273000A JPH0668085B2 (en) | 1985-12-04 | 1985-12-04 | Concentration method of water-dispersible varnish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60273000A JPH0668085B2 (en) | 1985-12-04 | 1985-12-04 | Concentration method of water-dispersible varnish |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62132977A true JPS62132977A (en) | 1987-06-16 |
| JPH0668085B2 JPH0668085B2 (en) | 1994-08-31 |
Family
ID=17521748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60273000A Expired - Lifetime JPH0668085B2 (en) | 1985-12-04 | 1985-12-04 | Concentration method of water-dispersible varnish |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0668085B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141124U (en) * | 1989-04-28 | 1990-11-27 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5276334A (en) * | 1975-12-22 | 1977-06-27 | Nippon Paint Co Ltd | Method of condensing dilute water paint solution |
| JPS594664A (en) * | 1982-06-29 | 1984-01-11 | Mitsubishi Electric Corp | Manufacture of electrodeposition coating |
-
1985
- 1985-12-04 JP JP60273000A patent/JPH0668085B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5276334A (en) * | 1975-12-22 | 1977-06-27 | Nippon Paint Co Ltd | Method of condensing dilute water paint solution |
| JPS594664A (en) * | 1982-06-29 | 1984-01-11 | Mitsubishi Electric Corp | Manufacture of electrodeposition coating |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141124U (en) * | 1989-04-28 | 1990-11-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0668085B2 (en) | 1994-08-31 |
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