JPS6116437B2 - - Google Patents
Info
- Publication number
- JPS6116437B2 JPS6116437B2 JP11578282A JP11578282A JPS6116437B2 JP S6116437 B2 JPS6116437 B2 JP S6116437B2 JP 11578282 A JP11578282 A JP 11578282A JP 11578282 A JP11578282 A JP 11578282A JP S6116437 B2 JPS6116437 B2 JP S6116437B2
- Authority
- JP
- Japan
- Prior art keywords
- anode
- acid
- electrodeposition coating
- cationic electrodeposition
- pigment
- 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
Links
- 238000004070 electrodeposition Methods 0.000 claims description 32
- 125000002091 cationic group Chemical group 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 22
- 239000000049 pigment Substances 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 21
- 239000002253 acid Substances 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 18
- 239000012528 membrane Substances 0.000 claims description 12
- 239000008199 coating composition Substances 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 7
- 239000002244 precipitate Substances 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 description 15
- 229920005989 resin Polymers 0.000 description 14
- 239000011347 resin Substances 0.000 description 14
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 229910044991 metal oxide Inorganic materials 0.000 description 5
- 150000004706 metal oxides Chemical class 0.000 description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 235000019253 formic acid Nutrition 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 4
- 150000007524 organic acids Chemical class 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000003011 anion exchange membrane Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 2
- 238000000502 dialysis Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 235000014655 lactic acid Nutrition 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910020282 Pb(OH) Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005370 electroosmosis Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 235000020354 squash Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Description
本発明は防錆顔料を含有したカチオン電着塗料
組成物を用いてカチオン電着塗装する際、陽極が
汚染されないようにしながら電着塗装する方法に
関するものである。
電着塗装は、「塗着効率が高い」、「袋構造部の
内部が塗装出来る」、「膜厚管理が電気的に管理出
来る」、「塗装工程が自動化出来る」等の利点によ
り広く普及している。
電着塗装法には、陽極に塗膜を析出させるアニ
オン電着塗装法と、陰極に塗膜を析出させるカチ
オン電着塗装法があるが、特に後者の方法によつ
て形成される塗膜は高防蝕性を示すことによりア
ニオン電着塗装法に代つて普及が著しい。
しかしながら、近年さらに塗膜の防錆力の向上
が要望されるようになり、これに対応すべく最近
のカチオン電着塗料組成物にはPb、Mn、Cu、
Sn、Ni等の金属の防錆顔料が配合されることが
多くなつて来た。
かかる防錆顔料の配合により塗膜の防錆力を向
上させる目的は達せられたが、一方でこの防錆顔
料自体に帰因する問題が生じることが判明した。
現在実用化されているカチオン電着塗装におい
ては、正に帯電した樹脂、かかる樹脂に包含され
た顔料粒子、負に帯電した酸イオン、溶媒として
の水および所望によつて使用される少量の溶剤等
が均一に分散されたカチオン電着塗料組成物の浴
液中に正極（陽極）と負極（陰極即ち被塗物）を
挿入し、両電極間に直流電圧を印加する、かくす
ると陰極即ち被塗物において正に帯電している樹
脂と、これに包含された顔料が析出して塗膜を形
成し、一方、陽極においては酸イオンが電子を放
出して酸として遊離する。かかるカチオン電着塗
装に使用するカチオン電着塗料組成物に前記の如
き防錆顔料を配合した場合には、これら防錆顔料
中には負に帯電していて電着時に陽極に析出する
金属の酸化物が含まれているため、長期間にわた
り繰り返し電着を継続するとこれらが陽極上にス
ラツヂ状に積層してきて陽極が汚染される。例え
ばPb系の防錆顔料を配合した場合、Pb顔料の成
分は一般的にPb（OH）2PbO・SiO2が主成分であ
るが、これが浴液中で溶解されるとPb++と
PbO--の形でイオン化する。このような状態にお
いて直流電圧を印加するとPb++は陰極即ち被塗
物上に析出し、塗膜の防錆力を向上させるが、
PbO--は陽極上に析出する。
またPbO--は陽極上にPbOの形で析出すると同
時に陽極酸化を受け鉛酸が生成され赤かつ色ある
いは灰色のスラツヂを積層させる。
この陽極上に積層したスラツヂは、浴液自体の
沈降防止等のため行なわれる浴槽内の撹拌により
陽極上より脱離し、ひいては被塗物にブツとして
付着したり、フイルターの目詰り等の問題を起こ
すことが判明した。
本発明者らは、かかる問題を解消し、有効に防
錆顔料を使用出来る方法を見出すべく鋭意研究し
た結果、防錆顔料含有カチオン電着塗料組成物を
浴液としてカチオン電着塗装するに際し、陽極を
中性膜を用いて浴液から隔離し、この隔離した領
域に酸性の極液を充てんし、該極液を前記防錆顔
料の析出物は溶解し、かつ陽極は腐蝕しない酸濃
度に管理することにより前記のような陽極汚染の
問題を解消したものである。
本発明で使用する膜の材料は通常の透析分離に
使用されるポリプロピレン、アクリル、塩化ビニ
ル、織布、布等の浴液に対して化学的に耐性が
あり、電着塗装に伴う撹拌その他の応力に耐えら
れる強度を有するものであればよく、使用可能な
種類としてはアニオン交換膜と中性膜があるが、
アニオン交換膜は酸（塩基性樹脂をカチオン性樹
脂として溶解させるための可溶化剤）を通過させ
る効率がよすぎるため隔離室内の酸の濃度を高く
し過ぎ、使用する陽極材によつてはその腐蝕が激
しくなるので好ましくなく、中性膜が好適であ
る。
また膜の孔径は被塗物を被覆するためのカチオ
ン性樹脂および顔料等は通過できなく、逆に水、
酸、金属イオンあるいは低分子量の樹脂等は通過
できる大きさでなくてはならず、通常約10〜
0.001μｍ程度が適当である。
本発明で使用するカチオン電着塗料は例えばエ
ポキシ樹脂にアミンを付加したアミノエポキシ樹
脂、更にポリイソシアネートを付加したアミノエ
ポキシイソシアネート樹脂、エポキシアミノアク
リル樹脂等の塩基性樹脂をギ酸、酢酸、プロピレ
ン酸、乳酸、リン酸等の有機酸または無機酸で中
和して水稀釈性にした樹脂を含有する塗料であ
る。陽極を前記中性膜を用いて浴液から隔離して
構成した隔離室には電着を開始するとき、純水に
酢酸、ギ酸または乳酸の如き有機酸を混合し、電
導度を500〜3000μmho/cmに調整した極液を入れ
る。これは電着開始時に酸で電導度を調整しない
と極液の電導度は純水の電導度（10万Ωcm以上）
となり、電流が流れない、そのため電気浸透およ
び隔離室内の酸の発生が起こらない。従つて電着
開始時に予め酸で電導度を500〜3000μmho/cmに
調整しておくことが必要である。
以下に図面を参照して本発明を説明する。第１
図は本発明方法を実施するための装置の一例を示
す略図である。
第１図において、電着槽１に防錆顔料を含有す
るカチオン電着塗料浴液３を液面３′にて示す高
さまで入れ、陰極（被塗物）２を浴液中に挿入
し、更に陽極４を挿入する。陽極４は中性膜６お
よび栓８で浴液３と隔離した隔離室７内に挿入す
る。隔離室７内には前述した如き有機酸を加えて
前述した電導度を有する極液を入れる。なお隔離
室７は浴液面３′より上方にまで延ばし、その浴
液面３′より上に極液排出口５を設けておく。
次に本発明方法の実施について説明する。
第１図において陽極４と陰極（被塗物）２の間
に直流電圧を印加すると正に帯電している樹脂
と、これに包含された顔料が陰極に引かれて陰極
上で析出して塗膜を形成するが、同時に電気浸透
圧により浴液中の水が膜を通つて隔離室内に入つ
てくる。
さらに継続的に電圧を印加すると極液はその液
面が浴液面より高くなり、隔離室上部に設けた極
液排出口よりオーバーフローして浴液中にもど
る。
これと同時に負に帯電している酸イオンと金属
の酸化物（例えばPbO--）は膜を通つて隔離室内
に移動し、酸イオンは電子を放出して酸として遊
離し、金属の酸化物は陽極上に析出する。
しかしながら、隔離室内は遊離した酸により酸
濃度が上昇するため、析出した金属の酸化物は溶
解される。
このため金属の酸化物は一旦は陽極に析出して
も積層して陽極を汚染することはない。
なお、隔離室内の極液の酸の濃度は極液が浴液
→隔離室→浴液と循環するため一定値に収束する
が、その電導度や450μmho/cmより低くなると析
出した金属の酸化物を溶解できなくなり、また、
電導度が10000μmho/cmを超えて高くなると陽極
素材の腐蝕が速くなるため、電導力を450〜1000
μmho/cmとなるように調整するとよい。
以下、実施例により本発明を説明する。
実施例 １
本実施例では下記組成を有するカチオン電着塗
料浴液を使用した。
エポキシ系カチオン樹脂 11.55重量部
酸化チタン 1.40 〃
体質顔料 1.50 〃
カーボン黒 0.10 〃
塩基性ケイ素酸鉛（防錆顔料） 0.35 〃
アルコール系溶剤 3.50重量部
ダイアセトンアルコール0.3
エチルセロソルブ0.5
有機酸（ギ酸） 0.30 〃
純 水 81.20 〃
100.00 〃
ポリプロピレン製の中性膜を用い、純水にギ酸
を添加して電導度を500μmho/cmに調整した極液
を充てん隔離室内に陽極を設けた第１図に示すよ
うな装置を用い、上記浴液でカチオン電着塗装を
継続的に行なつた。その結果を表−１に示す。
比較例 １
隔離室を設けないで、陽極を浴液から隔離する
ことなしに裸極のままで実施例１と同様にしてカ
チオン電着塗装を行なつた。その結果を表−１に
示す。
比較例 ２
隔離室の膜としてアニオン交換膜を用いた外は
実施例１と同様にして電着塗装を行なつた。
その結果を表−１に示す。
The present invention relates to a method of performing cationic electrodeposition coating using a cationic electrodeposition coating composition containing an anticorrosive pigment while preventing the anode from being contaminated. Electrodeposition coating has become widely popular due to its advantages such as ``high coating efficiency,'' ``can coat the inside of the bag structure,'' ``can control film thickness electrically,'' and ``can automate the coating process.'' ing. There are two types of electrodeposition coating methods: the anionic electrodeposition method in which a coating film is deposited on the anode, and the cationic electrodeposition coating method in which a coating film is deposited on the cathode. Due to its high corrosion resistance, it has become popular as an alternative to anionic electrodeposition coating. However, in recent years, there has been a demand for further improvement in the rust-preventing ability of coating films, and in order to meet this demand, recent cationic electrodeposition coating compositions include Pb, Mn, Cu,
Antirust pigments made of metals such as Sn and Ni are increasingly being added. Although the purpose of improving the rust-preventing power of a coating film was achieved by incorporating such a rust-preventing pigment, it was found that problems caused by the rust-preventing pigment itself were caused. The cationic electrodeposition coating currently in practical use consists of a positively charged resin, pigment particles contained in the resin, negatively charged acid ions, water as a solvent, and a small amount of solvent used as desired. A positive electrode (anode) and a negative electrode (cathode, i.e., the object to be coated) are inserted into a bath solution containing a cationic electrodeposition coating composition in which the In the coating, the positively charged resin and the pigment contained therein precipitate to form a coating film, while at the anode, acid ions release electrons and become liberated as acids. When the above-mentioned anti-rust pigments are added to the cationic electrodeposition coating composition used in such cationic electrodeposition coating, these anti-rust pigments contain negatively charged metals that are deposited on the anode during electrodeposition. Since it contains oxides, if electrodeposition is continued repeatedly over a long period of time, these will build up in the form of a sludge on the anode, contaminating the anode. For example, when a Pb-based rust preventive pigment is blended, the main component of the Pb pigment is generally Pb(OH) 2 PbO・SiO 2 , but when this is dissolved in the bath liquid, it becomes Pb ++ .
Ionizes in the form of PbO -- . When a DC voltage is applied under such conditions, Pb ++ is deposited on the cathode, that is, the object to be coated, and improves the rust prevention ability of the coating film.
PbO -- is deposited on the anode. In addition, PbO -- is deposited on the anode in the form of PbO and at the same time undergoes anodization to produce lead acid, forming a red, colored or gray sludge. The sludge layered on the anode is detached from the anode by stirring in the bathtub, which is done to prevent the bath liquid from settling, and may end up adhering to the object being coated or causing problems such as filter clogging. It turned out to be happening. The present inventors have conducted extensive research to solve this problem and find a method for effectively using rust-preventing pigments. As a result, when performing cationic electrodeposition coating using a cationic electrodeposition coating composition containing a rust-preventing pigment as a bath liquid, The anode is isolated from the bath solution using a neutral membrane, and this isolated area is filled with an acidic polar fluid, and the polar fluid is heated to an acid concentration that dissolves the precipitates of the rust preventive pigment and does not corrode the anode. By controlling this, the problem of anode contamination as described above can be solved. The membrane materials used in the present invention are chemically resistant to bath liquids such as polypropylene, acrylic, vinyl chloride, woven fabric, cloth, etc. used in normal dialysis separation, and are chemically resistant to bath liquids such as those used in general dialysis separation. Any material can be used as long as it has the strength to withstand stress, and usable types include anion exchange membranes and neutral membranes.
Anion exchange membranes are too efficient at passing acids (a solubilizing agent used to dissolve basic resins as cationic resins), so they can cause the concentration of acid in the isolation chamber to become too high, and depending on the anode material used, This is not preferable because it causes severe corrosion, and a neutral film is preferable. In addition, the pore size of the membrane is such that cationic resins and pigments used to coat the object cannot pass through, and on the contrary, water and pigments cannot pass through.
Acids, metal ions, or low molecular weight resins must be large enough to pass through, usually about 10~
Approximately 0.001 μm is appropriate. The cationic electrodeposition paint used in the present invention is, for example, an aminoepoxy resin obtained by adding an amine to an epoxy resin, an aminoepoxy isocyanate resin obtained by adding a polyisocyanate, a basic resin such as an epoxy aminoacrylic resin, and a mixture of formic acid, acetic acid, propylene acid, etc. A paint containing a resin that has been neutralized with an organic or inorganic acid such as lactic acid or phosphoric acid to make it dilutable with water. When starting electrodeposition, an organic acid such as acetic acid, formic acid or lactic acid is mixed with pure water to increase the conductivity to 500 to 3000 μmho. Add polar solution adjusted to /cm. This means that if the conductivity is not adjusted with acid at the start of electrodeposition, the conductivity of the polar solution will be the conductivity of pure water (100,000 Ωcm or more).
Therefore, no current flows, so electroosmosis and acid generation within the isolation chamber do not occur. Therefore, it is necessary to adjust the conductivity to 500 to 3000 μmho/cm with acid before starting electrodeposition. The present invention will be described below with reference to the drawings. 1st
The figure is a schematic diagram showing an example of an apparatus for carrying out the method of the invention. In FIG. 1, a cationic electrodeposition paint bath solution 3 containing an anti-rust pigment is poured into an electrodeposition tank 1 up to the level indicated by a liquid level 3', a cathode (subject to be coated) 2 is inserted into the bath solution, Furthermore, the anode 4 is inserted. The anode 4 is inserted into an isolation chamber 7 separated from the bath liquid 3 by a neutral membrane 6 and a plug 8. In the isolation chamber 7, an organic acid as described above is added and a polar liquid having the aforementioned conductivity is placed. The isolation chamber 7 extends above the bath liquid level 3', and the polar liquid outlet 5 is provided above the bath liquid level 3'. Next, implementation of the method of the present invention will be explained. In Fig. 1, when a DC voltage is applied between the anode 4 and the cathode (object to be coated) 2, the positively charged resin and the pigment contained therein are attracted to the cathode and deposited on the cathode to be coated. A membrane is formed, but at the same time water in the bath liquid passes through the membrane and enters the isolation chamber due to electroosmotic pressure. When the voltage is further applied continuously, the liquid level of the polar liquid becomes higher than the bath liquid level, and it overflows from the polar liquid outlet provided at the upper part of the isolation chamber and returns to the bath liquid. At the same time, negatively charged acid ions and metal oxides (e.g. PbO -- ) move through the membrane into the isolation chamber, and the acid ions release electrons and become liberated as acids, forming metal oxides. is deposited on the anode. However, since the acid concentration in the isolation chamber increases due to the free acid, the precipitated metal oxide is dissolved. Therefore, even if the metal oxide is once deposited on the anode, it will not accumulate and contaminate the anode. Note that the concentration of acid in the polar solution in the isolation chamber converges to a constant value as the polar solution circulates from the bath solution to the isolation chamber to the bath solution, but when its conductivity drops below 450 μmho/cm, metal oxides precipitate. can no longer be dissolved, and
When the conductivity becomes higher than 10000μmho/cm, the anode material corrodes faster, so the conductivity should be increased to 450~1000μmho/cm.
It is best to adjust it so that it is μmho/cm. The present invention will be explained below with reference to Examples. Example 1 In this example, a cationic electrodeposition paint bath liquid having the following composition was used. Epoxy cationic resin 11.55 parts by weight Titanium oxide 1.40 Extender pigment 1.50 Carbon black 0.10 Basic lead silicate (rust preventive pigment) 0.35 Alcohol solvent 3.50 parts by weight Diacetone alcohol 0.3 Ethyl cellosolve 0.5 Organic acid (formic acid) 0.30 〃 Pure water 81.20 〃 100.00 〃 A neutral membrane made of polypropylene is used, and an anode is installed in an isolation chamber filled with a polar solution whose conductivity is adjusted to 500 μmho/cm by adding formic acid to pure water.As shown in Figure 1. Cationic electrodeposition coating was carried out continuously using the above bath solution using a suitable apparatus. The results are shown in Table-1. Comparative Example 1 Cationic electrodeposition coating was carried out in the same manner as in Example 1 without providing an isolation chamber and using a bare electrode without isolating the anode from the bath solution. The results are shown in Table-1. Comparative Example 2 Electrodeposition coating was carried out in the same manner as in Example 1 except that an anion exchange membrane was used as the membrane in the isolation chamber. The results are shown in Table-1.
【表】
上記結果から本発明の方法を適用した場合はカ
チオン電着塗料組成物に防錆顔料を含有させても
陽極の汚染は起こらず、また陽極の腐蝕の進行も
少なくなつたことが判る[Table] From the above results, it can be seen that when the method of the present invention is applied, no contamination of the anode occurs even when the anticorrosion pigment is included in the cationic electrodeposition coating composition, and the progress of corrosion of the anode is reduced.
第１図は本発明の方法を実施する装置の一例を
示すものであり、図中、１は電着浴槽、２は陰
極、３は浴液、３′は浴液面、４は陽極、５は極
液排出口、６は中性膜、７は隔離室、８は栓であ
る。
FIG. 1 shows an example of an apparatus for carrying out the method of the present invention, and in the figure, 1 is an electrodeposition bath, 2 is a cathode, 3 is a bath liquid, 3' is a bath liquid level, 4 is an anode, and 5 6 is a neutral membrane, 7 is an isolation chamber, and 8 is a stopper.
Claims (1)
としてカチオン電着塗装するに際し、陽極を中性
膜を用いて浴液から隔離し、この隔離した領域に
酸性の極液を充てんし、この極液を前記防錆顔料
の析出物は溶解し、かつ、陽極は腐蝕しない酸濃
度に管理するカチオン電着塗装方法。1. When performing cationic electrodeposition coating using a cationic electrodeposition coating composition containing an anticorrosion pigment as a bath solution, the anode is isolated from the bath solution using a neutral membrane, and this isolated area is filled with an acidic polar solution, A cationic electrodeposition coating method in which the electrodeposition liquid is controlled at an acid concentration that dissolves the precipitates of the rust-preventing pigment and does not corrode the anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11578282A JPS596399A (en) | 1982-07-02 | 1982-07-02 | Cationic electrodeposition painting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11578282A JPS596399A (en) | 1982-07-02 | 1982-07-02 | Cationic electrodeposition painting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS596399A JPS596399A (en) | 1984-01-13 |
| JPS6116437B2 true JPS6116437B2 (en) | 1986-04-30 |
Family
ID=14670922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11578282A Granted JPS596399A (en) | 1982-07-02 | 1982-07-02 | Cationic electrodeposition painting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS596399A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468279B (en) * | 2019-09-09 | 2021-04-06 | 赵坤 | Method for recovering lead from lead plaster material of waste lead storage battery |
-
1982
- 1982-07-02 JP JP11578282A patent/JPS596399A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS596399A (en) | 1984-01-13 |
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