JPH0670200B2 - Method for preparing water-dispersible electrodeposition varnish - Google Patents
Method for preparing water-dispersible electrodeposition varnishInfo
- Publication number
- JPH0670200B2 JPH0670200B2 JP61036138A JP3613886A JPH0670200B2 JP H0670200 B2 JPH0670200 B2 JP H0670200B2 JP 61036138 A JP61036138 A JP 61036138A JP 3613886 A JP3613886 A JP 3613886A JP H0670200 B2 JPH0670200 B2 JP H0670200B2
- Authority
- JP
- Japan
- Prior art keywords
- varnish
- water
- dispersible
- concentration
- 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
- 238000004070 electrodeposition Methods 0.000 title claims description 25
- 238000000034 method Methods 0.000 title claims description 9
- 239000012528 membrane Substances 0.000 claims description 17
- 238000000108 ultra-filtration Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000000243 solution 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，水分散性電着ワニスの調製方法に関し，特に
比抵抗の高い水分散性電着ワニスを得るための新規な調
製方法に関する。TECHNICAL FIELD The present invention relates to a method for preparing a water-dispersible electrodeposition varnish, and more particularly to a novel preparation method for obtaining a water-dispersible electrodeposition varnish having a high specific resistance.
従来の技術及び解決を要すべき問題点 水分散性電着ワニスを用いて電着塗装により皮膜を形勢
する場合，市販のこの種のワニスは，ワニスの比抵抗が
低いので電着塗装時の電圧が低くなり，このためアルミ
ニウム製品のように表面が薄い酸化膜で覆われている物
品や複雑な形状の物品を電着塗装する場合には，つき回
り性が悪く均一な厚さの皮膜を得ることが困難であっ
た。Conventional techniques and problems that need to be solved When a film is formed by electrodeposition coating using a water-dispersible electrodeposition varnish, commercially available varnish of this type has a low specific resistance of the varnish, and The voltage is low, so when an article such as an aluminum product whose surface is covered with a thin oxide film or an article with a complicated shape is electrodeposited, a film with a uniform thickness and poor throwing power is applied. It was difficult to get.
問題解決の手段 本発明は，つき回り性の良好な水分散性電着ワニスの新
規な調製方法を提供せんとするものである。Means for Solving the Problems The present invention aims to provide a novel method for preparing a water-dispersible electrodeposition varnish having good throwing power.
すなわち、本発明は、水分散性電着ワニスの樹脂分濃度
を５重量％以下に調節する第１工程、および濃度調節さ
れた水分散性電着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、単に
限外濾過膜チューブという）供給し、かつ150／分以
下の低流量で上記チューブ中を通過させて上記ワニス中
の水分および電解質を濾過除去する第２工程とからなる
ことを特徴とするものである。That is, the present invention is directed to the first step of adjusting the resin content concentration of the water-dispersible electrodeposition varnish to 5% by weight or less, and the concentration-adjusted water-dispersible electrodeposition varnish with a diaphragm pump to an inner diameter of 1 to 2 cm. A second step of supplying a tube made of a filtration membrane (hereinafter, simply referred to as an ultrafiltration membrane tube) and passing it through the tube at a low flow rate of 150 / min or less to remove water and an electrolyte in the varnish by filtration. It is characterized by consisting of.
作 用 本発明の第１工程において，水分散性電着ワニスの樹脂
分濃度を５重量％以下に調節するために相当量の水を添
加することとなるが，一般に高比成功を有する水の添加
により，水分散性電着ワニスの比抵抗が上昇する。本発
明の第２工程においては，希釈し，比抵抗を高めた水分
散性電着ワニスを限外濾過膜に対して平行方向に流して
濃縮する。この濃縮によって生じる濾液の比抵抗とワニ
スのそれとは実質的に同等であるので，かくして濃縮さ
れ，かつ比抵抗の高い水分散性電着ワニスを得ることが
できる。なお，水分散性電着ワニスの濃縮際，該ワニス
をダイヤフラムポンプにより内径１〜2cmの限外濾過膜
チューブに供給し、かつ150／分以下の低流量で上記
チューブ中を通過させることにより、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流されるので，
限外濾過膜の濾過抵抗はほぼ初期地を保つこととなり，
この結果，長時間の連続した本発明の調製操業が可能と
なる。Operation In the first step of the present invention, a considerable amount of water is added to adjust the resin concentration of the water-dispersible electrodeposition varnish to 5% by weight or less, but in general, water having a high specific success rate is used. The addition increases the specific resistance of the water-dispersible electrodeposition varnish. In the second step of the present invention, the water-dispersible electrodeposited varnish, which has been diluted and has increased specific resistance, is flowed in a direction parallel to the ultrafiltration membrane to be concentrated. Since the specific resistance of the filtrate generated by this concentration is substantially equal to that of the varnish, it is possible to obtain a water-dispersible electrodeposited varnish that is concentrated and has a high specific resistance. Incidentally, at the time of concentrating the water-dispersible electrodeposition varnish, by supplying the varnish to an ultrafiltration membrane tube having an inner diameter of 1 to 2 cm by a diaphragm pump, and passing through the tube at a low flow rate of 150 / min or less, Since the resin content does not stay in the ultrafiltration membrane tube, but is constantly pushed downstream,
The filtration resistance of the ultrafiltration membrane keeps almost the initial value.
As a result, the continuous preparation operation of the present invention for a long time becomes possible.
第１工程において添加する水としては，清浄なものであ
れば特に制限はないが，蒸留水，イオン交換水な高比抵
抗を有する精製水が特に好ましい。本発明の方法によ
り，樹脂分濃度が少なくとも10重量％であり，かつ比抵
抗が少なくとも1,000Ω・cmである水分散性電着ワニス
を得るように，第１工程における希釈並びに第２工程に
おける濃縮の各程度を試行錯誤的に把握し実施すること
が好ましい。The water added in the first step is not particularly limited as long as it is clean, but distilled water, ion-exchanged water, or purified water having a high specific resistance is particularly preferable. According to the method of the present invention, dilution in the first step and concentration in the second step are carried out so as to obtain a water-dispersible electrodeposition varnish having a resin content of at least 10% by weight and a specific resistance of at least 1,000 Ω · cm. It is preferable to carry out by grasping each degree of the above by trial and error.
第２工程においては、ダイヤフラムポンプにより内径１
〜2cmの限外濾過膜チューブに供給し、かつ150／分以
下の低流量で上記チューブ中を通過させるので，ワニス
の輸送と上記の調製とが同時に行える利点がある。In the second step, the inner diameter of 1
Since it is supplied to an ultrafiltration membrane tube of ~ 2 cm and is passed through the tube at a low flow rate of 150 / min or less, there is an advantage that the varnish can be transported and the above-mentioned preparation can be performed at the same time.
以下、図面により，本発明を説明する。第１図は，本発
明の実施例の概略説明図であって，貯蔵タンク２に満し
た水分散性電着ワニス１に必要に応じてパイプ３よりワ
ニス濃度調節のための水を供給して所定の樹脂分濃度と
する。The present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view of an embodiment of the present invention, in which water for adjusting the varnish concentration is supplied from a pipe 3 to a water-dispersible electrodeposition varnish 1 filled in a storage tank 2 as needed. The concentration of the predetermined resin content is set.
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からなる限外濾過器６を通過
させて水分と電解質とを濾過除去して再び貯蔵タンク２
に戻す。水分散性電着ワニス１の比抵抗が所望の値に到
達するまでこのワニス循環操作を行うと良い。また、必
要に応じて第１工程と第２工程とを繰り返しても良い。The varnish 1 is pumped up by a diaphragm pump 4, and then passed through an ultrafilter 6 composed of an ultrafiltration membrane tube 5 to remove water and an electrolyte by filtration, and again the storage tank 2
Return to. This varnish circulation operation is preferably performed until the specific resistance of the water-dispersible electrodeposition varnish 1 reaches a desired value. Moreover, you may repeat a 1st process and a 2nd process as needed.
第２図の実施例においては，限外濾過器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続した
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図の実施例は，調製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調製することが可能で
ある。水分散性電着ワニスによっては輸送ポンプの回転
羽根にて激しく撹拌されたり，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，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
ることがあるので、この様なワニスの凝集を一層確実に
避けるには，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150
／分以下の低流量とすることが好ましい。In the embodiment shown in FIG. 2, the ultrafilter 6 has an inner diameter of 1 to 1.
It consists of a long ultrafiltration membrane tube with a total length of about 5 to 50 m in which a number of 2 cm short ultrafiltration membrane tubes are connected in cascade, and a diaphragm pump is used as the pump 4. In the embodiment shown in FIG. 1, the varnish 1 has a slightly slower preparation speed.
It is possible to prepare them without applying a large shearing force. Depending on the water-dispersible electrodeposition varnish, it may be violently stirred by the rotary vanes of the transport pump or transported in the tube at a high flow rate. Since the dispersion structure may be destroyed and the whole varnish may be aggregated by the rise, in order to avoid such varnish aggregation more reliably, a device as shown in Fig. 1 (a diaphragm type pump and a cascade connection is used). Use an ultrafiltration membrane tube) and use a flow rate of 150 in the ultrafiltration membrane tube.
It is preferable to set a low flow rate of not more than / minute.
実施例 樹脂濃度が20重量％，比抵抗800Ω・cmのエポキシ−ア
クリル系水分散性ワニス（菱電化成社製,V−551−20,以
下ワニスＡと称す）を比抵抗150,000Ω・cmのイオン交
換水用いて樹脂濃度５重量％に希釈した。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名 日東NTU−2000−P18）にエ
ア駆動のダイヤフラムポンプを用いて上記の希釈エポキ
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20重量％に回復し，またその比抵抗は2800Ω・
cm（以下ワニスＢと称する）であった。また，この濃縮
によってもワニスの凝集は起らなかった。EXAMPLE An epoxy-acrylic water-dispersible varnish (V-551-20, manufactured by Ryoden Kasei Co., Ltd., hereinafter referred to as varnish A) having a resin concentration of 20% by weight and a specific resistance of 800 Ω · cm has a specific resistance of 150,000 Ω · cm. The resin concentration was diluted to 5% by weight with ion-exchanged water. Using an air-driven diaphragm pump in a concentrator (product name Nitto NTU-2000-P18 manufactured by Nitto Denko Co., Ltd.) that has 18 ultrafiltration membrane tubes with an inner diameter of 1.5 cm and a length of 2 m connected in cascade, use the above diluted epoxy. − Acrylic water-dispersible varnish with a concentrator inlet pressure of 7 kg /
When the resin was repeatedly flown at a flow rate of 80 / min at cm 2 and a resin flow rate of 20% by weight, the specific resistance was 2800Ω ・
cm (hereinafter referred to as varnish B). In addition, the varnish did not aggregate even by this concentration.
上記のワニスＡおよびワニスＢを用いて，予め５重量％
の苛性ソーダ水溶液により表面処理し，水洗した1.0mm
φのアルミニウム線に電着塗装を施して絶縁電線を製造
した。該アルミニウム線の線速は,15m/分，電着時間は
５秒，焼付温度は400℃であった。結果を下表に示す。Using the above varnish A and varnish B, 5% by weight in advance
1.0mm surface-treated with a caustic soda solution and washed with water
An insulated wire was manufactured by applying electrodeposition coating to a φ aluminum wire. The line speed of the aluminum wire was 15 m / min, the electrodeposition time was 5 seconds, and the baking temperature was 400 ° C. The results are shown in the table below.
ワニスＡ ワニスＢ 電着電圧（Ｖ） ８ 50 絶縁層の表面状態 ザラザラ状 平滑 絶縁層厚（μｍ） 35 35 破壊電圧（kV） 1.8 13.5 本発明により，比抵抗の高い，したがってつき回り性の
良好な水分散性電着ワニスを簡単に得ることができる。
しかも，濃縮の過程において処理すべきワニスをダイヤ
フラムポンプにより限外濾過膜チューブ内に低流量で通
過させるので、該限外濾過膜チューブは、その濾過抵抗
が実質上上昇することがない。したがって，長時間にわ
たって連続的にワニスを濃縮調製することが可能とな
る。Varnish A Varnish B Electrodeposition voltage (V) 8 50 Surface state of insulating layer Rough smooth Smooth insulating layer thickness (μm) 35 35 Breakdown voltage (kV) 1.8 13.5 According to the present invention, high specific resistance and therefore good throwing power A simple water-dispersible electrodeposition varnish can be easily obtained.
Moreover, since the varnish to be treated in the concentration process is passed through the ultrafiltration membrane tube at a low flow rate by the diaphragm pump, the filtration resistance of the ultrafiltration membrane tube does not substantially increase. Therefore, it becomes possible to continuously concentrate and prepare the varnish over a long period of time.
第１図は、本発明の方法の説明概略図である。 1:水分散性電着ワニス 2:貯蔵タンク 4:ダイヤフラムポンプ 5:限外濾過膜チューブ 6:限外濾過器 FIG. 1 is a schematic diagram illustrating the method of the present invention. 1: Water-dispersible electrodeposition varnish 2: Storage tank 4: Diaphragm pump 5: Ultrafiltration membrane tube 6: Ultrafiltration device
Claims (3)
％以下に調節する第１工程、および濃度調節された水分
散性電着ワニスをダイヤフラムポンプにより内径１〜2c
mの限外濾過膜からなるチューブに供給し、かつ150／
分以下の低流量で上記チューブ中を通過させて上記ワニ
ス中の水分および電解質を濾過除去する第２工程とから
なることを特徴とする水分散性電着ワニスの調整方法。1. A first step of adjusting the resin concentration of the water-dispersible electrodeposition varnish to 5% by weight or less, and the concentration-adjusted water-dispersible electrodeposition varnish by a diaphragm pump having an inner diameter of 1 to 2c.
It is supplied to a tube consisting of m ultrafiltration membrane, and 150 /
And a second step of filtering and removing water and electrolyte in the varnish by passing through the tube at a low flow rate of 5 minutes or less, and a method for adjusting a water-dispersible electrodeposition varnish.
系ワニスである特許請求の範囲第１項記載の調製方法。2. The preparation method according to claim 1, wherein the water-dispersible electrodeposition varnish is an epoxy-acrylic varnish.
り、樹脂分濃度が少なくとも10重量％であり、かつ比抵
抗が少なくとも1,000Ω・cmである水分散性電着ワニス
を得る特許請求の範囲第１項または第２項記載の調製方
法。3. A water-dispersible electrodeposition varnish having a resin content concentration of at least 10% by weight and a specific resistance of at least 1,000 Ω · cm by removing water and electrolyte in the second step. The preparation method according to item 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61036138A JPH0670200B2 (en) | 1986-02-20 | 1986-02-20 | Method for preparing water-dispersible electrodeposition varnish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61036138A JPH0670200B2 (en) | 1986-02-20 | 1986-02-20 | Method for preparing water-dispersible electrodeposition varnish |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62195066A JPS62195066A (en) | 1987-08-27 |
| JPH0670200B2 true JPH0670200B2 (en) | 1994-09-07 |
Family
ID=12461425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61036138A Expired - Lifetime JPH0670200B2 (en) | 1986-02-20 | 1986-02-20 | Method for preparing water-dispersible electrodeposition varnish |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0670200B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4536482B2 (en) * | 2004-10-25 | 2010-09-01 | 旭化成ケミカルズ株式会社 | Operation method of membrane filtration device |
-
1986
- 1986-02-20 JP JP61036138A patent/JPH0670200B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62195066A (en) | 1987-08-27 |
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| EXPY | Cancellation because of completion of term |