JPH0668085B2 - Concentration method of water-dispersible varnish - Google Patents
Concentration method of water-dispersible varnishInfo
- Publication number
- JPH0668085B2 JPH0668085B2 JP60273000A JP27300085A JPH0668085B2 JP H0668085 B2 JPH0668085 B2 JP H0668085B2 JP 60273000 A JP60273000 A JP 60273000A JP 27300085 A JP27300085 A JP 27300085A JP H0668085 B2 JPH0668085 B2 JP H0668085B2
- Authority
- JP
- Japan
- Prior art keywords
- varnish
- water
- dispersible
- ultrafiltration membrane
- electrodeposition
- 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.)
- Expired - Lifetime
Links
- 239000002966 varnish Substances 0.000 title claims description 47
- 238000000034 method Methods 0.000 title claims description 10
- 238000004070 electrodeposition Methods 0.000 claims description 24
- 239000012528 membrane Substances 0.000 claims description 23
- 238000000108 ultra-filtration Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 239000011347 resin Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 13
- 238000000576 coating method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 210000003298 dental enamel Anatomy 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000004931 aggregating effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Paints Or Removers (AREA)
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関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for concentrating a water-dispersible varnish having a reduced resin content 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、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、経済的にその分
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被膜
の外観や耐電圧強度が悪化する問題がある。このため、
使用中の又は使用済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。[Prior art and problems that need to be solved] Water dispersibility is used in the manufacture of enamel insulated wires in which a resin component is deposited on a conductor by electrodeposition using a water dispersible varnish, and then the deposited resin layer is baked. The content of the dispersed resin in the varnish is economically reduced. It is necessary to increase the applied voltage required for electrodeposition as the resin content decreases, but when the applied voltage increases to some extent, there is a problem that the external appearance of the electrodeposition coating and the withstand voltage strength deteriorate. For this reason,
Concentrate used or used water-dispersible electrodeposition varnish,
It needs to 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。A water-dispersible varnish can be concentrated by evaporating and removing only water by heating, but this method is uneconomical because it requires a large amount of electric energy for evaporation due to a large latent heat of evaporation 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、水分散性ワニス
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。The water-dispersible varnish can be concentrated by a usual method, that is, by filtering the varnish by flowing it in a direction perpendicular to the ultrafiltration membrane and collecting the resin component on the membrane. However, when filtered by this method, the resin content in the water-dispersible varnish is generally extremely fine, so that the filtration resistance becomes excessive due to the resin content deposited on the ultrafiltration membrane within a short time. Therefore, economical filtration becomes 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。[Means for Solving Problems] The present invention overcomes the above problems by applying ultrafiltration.
即ち、本発明は、水分散性電着用ワニスを、ダイヤフラ
ムポンプにより内径１〜2cmの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いう）に供給し、か
つ50〜150／分の流量で該チューブ中を通過させて上
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, the present invention supplies a water-dispersible electrodeposition varnish to a tube made of an ultrafiltration membrane having an inner diameter of 1 to 2 cm (hereinafter, referred to as an ultrafiltration membrane tube) by a diaphragm pump, and 50 to 150 / min. The present invention provides a method for concentrating a water-dispersible varnish, which comprises filtering the water content in the varnish by passing it through the tube at a flow rate.
［作用］ 濃縮されるべき水分散性電着用ワニスをダイヤフラムポ
ンプにより内径１〜2cmの限外濾過膜からなるチューブ
に供給し、かつ50〜150／分の流量で該チューブ中を
通過させることにより、該ワニス中の樹脂分は限外濾過
膜チューブ内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
チューブを透過して濾過される。この結果、限外濾過膜
チューブ内を流れるワニスは、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
限外濾過膜チューブ内に留まらず絶えず下流に押し流さ
れるので、限外濾過膜の濾過抵抗は、ほぼ初期値を保つ
こととなり、この結果、長時間の連続した濃縮操業が可
能となるので、ワニスの輸送と濃縮が同じに行なえ、50
〜150／分という通例の輸送量に相当する流量で、従
って輸送を兼ねた流量で濃縮処理を達成できる利点があ
る。[Operation] By supplying a water-dispersible electrodeposition varnish to be concentrated to a tube made of an ultrafiltration membrane having an inner diameter of 1 to 2 cm by a diaphragm pump and passing the tube at a flow rate of 50 to 150 / min. The resin component in the varnish is not retained in the ultrafiltration membrane tube and is always pushed downstream by the varnish flow. On the other hand, the water content in the varnish permeates the ultrafiltration membrane tube and is filtered. As a result, the resin concentration of the varnish flowing in the ultrafiltration membrane tube increases as it goes downstream. Further, as described above, since the resin component does not stay in the ultrafiltration membrane tube and is continuously swept downstream, the filtration resistance of the ultrafiltration membrane will maintain an almost initial value, and as a result, continuous concentration for a long time will result. Since it can be operated, varnish can be transported and concentrated in the same way.
There is an advantage that the concentration treatment can be achieved at a flow rate corresponding to a usual transport rate of ~ 150 / min, and therefore at a flow rate that also serves as transport.
以下、図面に基づき本発明を説明する。第１図は電着塗
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を満た
した電着槽２を貫通して銅線３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 described below with reference to the drawings. FIG. 1 is a schematic view of the case where the present invention is applied to the production of an enamel insulated wire by an electrodeposition coating method. The copper wire 3 penetrates an electrodeposition tank 2 filled with a water-dispersible electrodeposition varnish 1. And the copper wire 3 is subjected to electrodeposition coating during this traveling.
電着ワニス１を、ダイヤフラムポンプ４により汲み揚
げ、次いで、限外濾過膜チューブ５からなる限界濾過器
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は、電
着ワニス１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、次
いで電着槽２に還元する。The electrodeposited varnish 1 is pumped up by the diaphragm pump 4 and then passed through the ultrafiltration membrane 6 composed of the ultrafiltration membrane tube 5 to be concentrated and stored in the storage tank 8. When the desired concentration is not reached by only one passage described above, the electrodeposition varnish 1 may be circulated between the storage tank 8 and the ultrafilter 6 as many times as necessary. If necessary, the concentrated varnish stored in the storage tank 8 is supplemented with the component filtered out together with water in the above-mentioned concentration process from the chemical replenishing device 7, and then reduced to the electrodeposition tank 2.
第１図の実施例においては、限外濾過膜器６は、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５〜50cmの長尺限外濾過膜チューブからなって
おり、ダイヤフラムポンプ４が用いられている。In the embodiment shown in FIG. 1, the ultrafiltration membrane device 6 has an inner diameter of 1
The diaphragm pump 4 is composed of a long ultrafiltration membrane tube having a total length of about 5 to 50 cm in which a large number of short ultrafiltration membrane tubes of up to 2 cm are cascade-bonded.
この実施例は、ワニスの濃縮速度はやや遅いが、ワニス
１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。水分散性電着用ワニスによっては回転羽根式の
大容量ポンプの回転羽根によって激しく攪拌されたり、
あるいは高流速で上記チューブ内を押し流されることに
より、ワニスにかかる大きな剪断力に基づくワニス温度
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（ワニスの全体がゲル状的に凝集してポンプを介
しワニスを輸送することが実質的に不可能となる）があ
るので、この様なワニスの凝集を一層確実に避けるため
には、第１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50〜150／
分の流量とすることが好ましい。In this example, the concentration rate of the varnish is slightly slow, but the varnish 1 can be concentrated without applying a large shearing force. Depending on the water-dispersible electrodeposition varnish, it may be vigorously agitated by the rotary vanes of a rotary vane type large capacity pump,
Alternatively, by being swept in the tube at a high flow rate, the dispersion structure is destroyed by the rise in varnish temperature due to the large shearing force applied to the varnish, and the entire varnish aggregates (the entire varnish aggregates in a gel form. Since it is virtually impossible to transport the varnish through the pump), in order to more reliably avoid such agglomeration of the varnish, a device (diaphragm type pump and The use of cascaded ultrafiltration membrane tubes) is used, and the flow rate in the ultrafiltration membrane tube is 50 to 150 /
It is preferable to set the flow rate to a minute.
実施例−１ 初期の樹脂濃度が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 epoxy-acrylic water-dispersible varnish having an initial resin concentration of 15% by weight was used to produce an electrodeposition-coated electric wire. As a result, the resin concentration of the varnish was reduced to 8% by weight.
内径1.5cm、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 日東NTU−200
0−P18）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
濃縮装置入口圧力7kg／cm2、流量80／分で繰り返し流
したところ、ワニスの樹脂濃度は15重量％回復した。ま
た、この濃縮によってもワニスの凝集は起こらなかっ
た。Concentrator with 18 ultrafiltration membrane tubes with an inner diameter of 1.5 cm and a length of 2 m connected in series (product of Nitto Denko Nitto NTU-200
0-P18) the air-driven diaphragm pump was used to repeatedly flow the epoxy-acrylic water-dispersible varnish with reduced concentration described above at a concentrator inlet pressure of 7 kg / cm 2 and a flow rate of 80 / min. Recovered 15% by weight. The varnish did not aggregate even by this concentration.
［効果］ 本発明によれば、水分散性電着用ワニスをダイヤフラム
ポンプにて限外濾過膜チューブ内を50〜150／分の流
量で通過させるので、輸送を兼ねた効率的な流量で、し
かも該ワニスの全体を凝集させることなく、従ってワニ
ス全体のゲル状的凝集による輸送不能を防止しつつ、更
にその濃縮過程における当該チューブの濾過抵抗を上昇
させることなく低濃度の該ワニスを濃縮でき、これによ
り長時間にわたり水分散性電着用ワニスを連続的に濃縮
処理できて、電着槽中の該ワニスを所定の高濃度に常に
維持しながら、従ってワニス濃度の変化による電着条件
の変更の必要なく、品質が安定した電着塗装を長時間に
わたり連続的に効率よく行うことができる。[Effect] According to the present invention, the water-dispersible electrodeposition varnish is passed through the ultrafiltration membrane tube with a diaphragm pump at a flow rate of 50 to 150 / min. It is possible to concentrate the varnish in a low concentration without aggregating the entire varnish, thus preventing transport failure due to gel agglomeration of the entire varnish, and further without increasing the filtration resistance of the tube in the concentration process, As a result, the water-dispersible electrodeposition varnish can be continuously concentrated for a long time, and the varnish in the electrodeposition tank is always maintained at a predetermined high concentration. It is possible to continuously and efficiently perform electrodeposition coating with stable quality over a long period of time without need.
第１図は電着塗装法により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:水分散性電着用ワニス 2:電着槽 3:銅線 4:ダイヤフラムポンプ 5:限外濾過膜チューブ 6:限外濾過膜器 7:薬剤補充装置 8:貯蔵タンクFIG. 1 is a schematic diagram in the case where the present invention is applied to an enamel insulated wire by an electrodeposition coating method. 1: Water-dispersible electrodeposition varnish 2: Electrodeposition tank 3: Copper wire 4: Diaphragm pump 5: Ultrafiltration membrane tube 6: Ultrafiltration membrane device 7: Drug replenishment device 8: Storage tank
Claims (2)
ンプにより内径１〜2cmの限外濾過膜からなるチューブ
に供給し、かつ50〜150／分の流量で該チューブ中を
通過させ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。1. A varnish prepared by supplying a water-dispersible electrodeposition varnish to a tube made of an ultrafiltration membrane having an inner diameter of 1 to 2 cm by a diaphragm pump and passing the tube at a flow rate of 50 to 150 / min. A method for concentrating a water-dispersible varnish, characterized in that the water content therein is removed by filtration.
ル系ワニスである特許請求の範囲第１項記載の濃縮方
法。2. The concentration method according to claim 1, wherein the water-dispersible electrodeposition 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 JPS62132977A (en) | 1987-06-16 |
| JPH0668085B2 true 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141124U (en) * | 1989-04-28 | 1990-11-27 |
Family Cites Families (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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62132977A (en) | 1987-06-16 |
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