EP0871802A1 - Verfahren zur entfernung der bei der kathodischen elektrotauchlackierung freigesetzten säure - Google Patents
Verfahren zur entfernung der bei der kathodischen elektrotauchlackierung freigesetzten säureInfo
- Publication number
- EP0871802A1 EP0871802A1 EP96930151A EP96930151A EP0871802A1 EP 0871802 A1 EP0871802 A1 EP 0871802A1 EP 96930151 A EP96930151 A EP 96930151A EP 96930151 A EP96930151 A EP 96930151A EP 0871802 A1 EP0871802 A1 EP 0871802A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- anode
- oxidation
- mixture
- electrocoating
- 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
- 239000002253 acid Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000000576 coating method Methods 0.000 title claims abstract description 8
- 239000011248 coating agent Substances 0.000 title claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 239000003973 paint Substances 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 230000008021 deposition Effects 0.000 claims abstract description 6
- 229910001925 ruthenium oxide Inorganic materials 0.000 claims abstract description 6
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001887 tin oxide Inorganic materials 0.000 claims abstract description 6
- 238000003618 dip coating Methods 0.000 claims abstract 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 42
- 238000004070 electrodeposition Methods 0.000 claims description 23
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 21
- 235000019253 formic acid Nutrition 0.000 claims description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 11
- 239000010936 titanium Substances 0.000 claims description 11
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000000909 electrodialysis Methods 0.000 claims description 6
- 238000000108 ultra-filtration Methods 0.000 claims description 6
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 5
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 5
- 229910000457 iridium oxide Inorganic materials 0.000 claims description 5
- 150000002739 metals Chemical class 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 239000000057 synthetic resin Substances 0.000 claims description 5
- 229920003002 synthetic resin Polymers 0.000 claims description 5
- 125000002091 cationic group Chemical group 0.000 claims description 4
- 239000004310 lactic acid Substances 0.000 claims description 4
- 235000014655 lactic acid Nutrition 0.000 claims description 4
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 238000000502 dialysis Methods 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000010955 niobium Substances 0.000 claims description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
- 238000001223 reverse osmosis Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 abstract description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- 238000006731 degradation reaction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000000049 pigment Substances 0.000 description 7
- 230000007306 turnover Effects 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000004971 Cross linker Substances 0.000 description 4
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 4
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 239000011541 reaction mixture Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LHENQXAPVKABON-UHFFFAOYSA-N 1-methoxypropan-1-ol Chemical compound CCC(O)OC LHENQXAPVKABON-UHFFFAOYSA-N 0.000 description 2
- KQEIJFWAXDQUPR-UHFFFAOYSA-N 2,4-diaminophenol;hydron;dichloride Chemical compound Cl.Cl.NC1=CC=C(O)C(N)=C1 KQEIJFWAXDQUPR-UHFFFAOYSA-N 0.000 description 2
- KUBDPQJOLOUJRM-UHFFFAOYSA-N 2-(chloromethyl)oxirane;4-[2-(4-hydroxyphenyl)propan-2-yl]phenol Chemical compound ClCC1CO1.C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 KUBDPQJOLOUJRM-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 150000002118 epoxides Chemical class 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- -1 manganates Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000005588 protonation Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 150000003335 secondary amines Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- OAAZUWWNSYWWHG-UHFFFAOYSA-N 1-phenoxypropan-1-ol Chemical compound CCC(O)OC1=CC=CC=C1 OAAZUWWNSYWWHG-UHFFFAOYSA-N 0.000 description 1
- LXOFYPKXCSULTL-UHFFFAOYSA-N 2,4,7,9-tetramethyldec-5-yne-4,7-diol Chemical compound CC(C)CC(C)(O)C#CC(C)(O)CC(C)C LXOFYPKXCSULTL-UHFFFAOYSA-N 0.000 description 1
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 1
- HDPLHDGYGLENEI-UHFFFAOYSA-N 2-[1-(oxiran-2-ylmethoxy)propan-2-yloxymethyl]oxirane Chemical compound C1OC1COC(C)COCC1CO1 HDPLHDGYGLENEI-UHFFFAOYSA-N 0.000 description 1
- CYEJMVLDXAUOPN-UHFFFAOYSA-N 2-dodecylphenol Chemical compound CCCCCCCCCCCCC1=CC=CC=C1O CYEJMVLDXAUOPN-UHFFFAOYSA-N 0.000 description 1
- KFZMGEQAYNKOFK-UHFFFAOYSA-N 2-propanol Substances CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- WPSWDCBWMRJJED-UHFFFAOYSA-N 4-[2-(4-hydroxyphenyl)propan-2-yl]phenol;oxirane Chemical compound C1CO1.C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 WPSWDCBWMRJJED-UHFFFAOYSA-N 0.000 description 1
- LCFVJGUPQDGYKZ-UHFFFAOYSA-N Bisphenol A diglycidyl ether Chemical compound C=1C=C(OCC2OC2)C=CC=1C(C)(C)C(C=C1)=CC=C1OCC1CO1 LCFVJGUPQDGYKZ-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- OPKOKAMJFNKNAS-UHFFFAOYSA-N N-methylethanolamine Chemical compound CNCCO OPKOKAMJFNKNAS-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000003011 anion exchange membrane Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- NGDPCAMPVQYGCW-UHFFFAOYSA-N dibenzothiophene 5-oxide Chemical compound C1=CC=C2S(=O)C3=CC=CC=C3C2=C1 NGDPCAMPVQYGCW-UHFFFAOYSA-N 0.000 description 1
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- SWVGZFQJXVPIKM-UHFFFAOYSA-N n,n-bis(methylamino)propan-1-amine Chemical compound CCCN(NC)NC SWVGZFQJXVPIKM-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical group O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- MUMZUERVLWJKNR-UHFFFAOYSA-N oxoplatinum Chemical compound [Pt]=O MUMZUERVLWJKNR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910003446 platinum oxide Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical class [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/16—Regeneration of process solutions
- C25D21/18—Regeneration of process solutions of electrolytes
Definitions
- the present invention relates to a method for removing the acid released during cathodic electrocoating during the deposition of the paint film from the electrocoating bath.
- the substrate to be painted is immersed in an aqueous electrocoating bath and switched as a cathode. After the voltage is applied, paint film is deposited on the substrate.
- the lacquers used are polymers which have been converted into a water-dispersible form by protonation. Protonation is mainly achieved by adding weak organic acids. These acids accumulate in the anode area if the cationic paint binder is neutralized during the paint deposition and the used paint is gradually replaced by new, protonated paint. The acid must therefore be removed from the bath in order to control the pH of the electro-immersion bath. This is usually done via the so-called anolyte cycle.
- the anolyte circuit first assumes that the anode is separated from the rest of the electrodeposition bath by a diaphragm or a membrane.
- This membrane is typically an anion exchange membrane that only has a flow of anions, i.e. in the present case acid residues, in the direction of the anode.
- paint binders and pigments are retained.
- the anolyte circuit removes acid-enriched electrolyte from the anode compartment, generally discards it as waste water, and replaces it with water.
- electro-immersion baths usually contain an ultrafiltration circuit. This removes bath liquid directly and feeds it to ultrafiltration in order to separate solvents and other low-molecular components of the paint that accumulate in the bath.
- DE-4409270 also proposes the anodic oxidation of the acid used.
- formic acid is also used here essentially, ie over 90%, as the acid.
- anode materials are called platinum or platinized stainless steel electrodes, platinized titanium electrodes, platinized graphite electrodes, ruthenium-doped stainless steel electrodes or mixed oxide-doped electrodes made of stainless steel, titanium or graphite.
- no measurement results and no numerical values for the degradation rates achieved are mentioned.
- electrodes are known from German patent 15 71 721, which among other things. can be used as an anode for carrying out the chlor-alkali electrolysis.
- oxides of platinum, iridium, rhodium, palladium, ruthenium, manganese, lead, chromium, cobalt, iron, titanium, tantalum, zirconium or silicon are used.
- Other areas of application for the electrodes mentioned are electrodialysis and electrocoating.
- German patent 1671 422 also discloses the use of an anode consisting of a titanium core and a mixed coating of at least part of the core surface made of a material made of ruthenium oxide and titanium oxide which is resistant to the electrolyte and the electrolysis products for alkali chloride electrolysis.
- These anodes show a significantly lower overvoltage and are also dimensionally stable. Due to these properties, cell constructions, e.g. Membrane cells were developed, thus increasing the performance of the previously known mercury and diaphragm cells.
- German published patent application 3423605 describes composite electrodes made of electrically conductive plastic and catalytic particles partially pressed therein (carrier particles with applied catalyst) and processes for their production. You can use it as an oxygen anode, for example, in the electrolytic extraction of metals from aqueous Solutions are used. Electrodialysis and electrodeposition are mentioned as further areas of application.
- European patent 0296 167 also describes the use of comparable electrodes (so-called “dimensionally stable anodes DSA”) in cathodic electrodeposition coating. These are neither dissolved nor destroyed during the electrophoretic coating process under the conditions of the electrodeposition process there, ie in relation to Lacquer formulation, current density, pH value and the decomposing influence of chlorine.
- DSA dimensionally stable anodes
- Electrodes for oxidative degradation were also tested and used in the field of wastewater treatment. It was found in particular that electrodes with a coating of tin oxide (Sn0 2 ) have a high efficiency in the electrochemical degradation of organic substances. These electrodes were tested in particular in comparison to conventional electrodes, for example the above-mentioned DSA electrodes (Stucki, Kötz, Carcer, Suter: "Electrochemical waste water treatment using high overvoltage anodes, Part II: Anode Performance and applications", Journal of Applied Electrochemistry 21 (1991), 99-104; Comninellis: “Traitment des eaux residuaires par intens electrochimique", gwa 11/92, 792-797; Comninellis: “Electrochemical treatment of waste water containing phenol", Electrochemical Engineering and the Environment 92, Symposium Series No. 127, 189-201).
- the object of the present invention is to provide a process for removing the acid released during cathodic electrocoating during the deposition of the paint film, which process reduces the number of rinsing processes required via the anolyte circuit to remove acid and possible degradation products of the acid or that works entirely without the anolyte cycle.
- This object could surprisingly be achieved in that the released acid, preferably formic acid, is removed by oxidation on anodes which are coated with a layer of ruthenium, iridium or tin oxide or a mixture of these oxides.
- acids other than formic acid are generally less favorable for electrochemical degradability.
- Lactic acid can only be broken down electrochemically to approx. 35%.
- the anolyte circuit can even be completely dispensed with, ie the electrodes according to the invention can be inserted directly into the electrodeposition bath and the anode and cathode compartments no longer have to be separated from one another by a membrane.
- additional methods for reducing the acid content are used according to the invention.
- membrane processes known per se These preferably start with the ultrafiltrate, because the higher molecular paint components are no longer present here. Examples of suitable membrane processes are processes using dialysis, osmosis, reverse osmosis, electrodialysis or a further ultrafiltration.
- electrocoating baths which contain synthetic resins containing cationic groups as binders. They are preferably protonated reaction products made from synthetic resins and amines containing epoxy groups. These are preferably formic acid, acetic acid, lactic acid and dimethylolpropionic acid. The use of formic acid is very preferred. The acids mentioned are oxidized to water and carbon dioxide at the anode.
- the substrate of the electrodes according to the invention can consist of metal or conductive plastic.
- the metals are preferably titanium, tantalum, niobium or an alloy of these metals.
- an alloy of titanium and 1 to 15% by weight of molybdenum. Titanium is particularly preferred as the substrate.
- the layer of ruthenium, iridium or tin oxide or a mixture of these oxides applied to the anodes used according to the invention preferably has a layer thickness of 0.01 to 10 ⁇ m. A particularly preferred range is 0.1-7 ⁇ m.
- Binder dispersion (cf. EP 074634, example C, but neutralized with formic acid)
- the following example shows the preparation of a cationic resin which is neutralized by formic acid.
- Bisphenol A, bisphenol A diglycidyl ether and a bisphenol A-ethylene oxide adduct are heated together and form a modified polyepoxy resin.
- a blocked isocyanate is given as a crosslinker.
- a reaction with a mixture of secondary amines then takes place.
- the resin is partially neutralized with formic acid and dispersed in water.
- Demineralized water 3026.63 Liquid epoxy resin produced by reacting bisphenol A and epichlorohydrin with an epoxide equivalent weight of 188. (Manufacturer: Shell Chemicals)
- polyurethane crosslinker made from diphenylmethane diisocyanate, in which 4.3 of 6 moles of isocyanate are first reacted with butyl diglycol and the remaining 1.7 moles with trimethylol propane.
- the crosslinker is present in an 80% solution of methyl isobutyl ketone and isobutanol (weight ratio 9: 1).
- the Epikote 828, bisphenol A and Dianol 265 are heated to 130 ° C. in a reactor with nitrogen blanketing. Then 1.6 parts of the benzyldimethylamine (catalyst) are added, the reaction mixture is heated to 150 ° C. and kept between 150 and 190 ° C. for about half an hour and then cooled down to 140 ° C. The remaining amount of benzyldimethylamine is then added and the temperature is kept at 140 ° C. until an epoxide equivalent weight of 1120 is established after about 2.5 hours. Immediately afterwards, the polyurethane crosslinker is added and the temperature is reduced to 100.degree. The mixture of secondary amines is then added and the reaction is held at 115 ° C.
- the resin is dispersed in the water in which the formic acid and the emulsifier mixture are dissolved.
- the solid is 35% after this step, and increases to 37% after stripping off the low-boiling solvents.
- the dispersion is characterized by a particle size of approx. 150 nm.
- the EEW of the reaction mixture is then 860.
- the mixture is cooled and 9.91 parts of butyl glycol and 17.88 parts of a propylene glycol diglycidyl ether with EEW 333 (DER 732, Dow Chemical) are added.
- EEW 333 propylene glycol diglycidyl ether with EEW 333
- EEW 333 a propylene glycol diglycidyl ether with EEW 333
- the resin has a solids content of 69.8% (measured for 1 hour at 130 ° C) and a viscosity of 5.5 dPas (40% in Solvenon PM; cone-plate viscometer at 23 ° C).
- C. pigment paste (cf. EP 505 445, example: pigment paste B 3, but neutralized with formic acid)
- To prepare the pigment paste 34.34 parts of deionized water, 0.38 part of formic acid (85% strength) and 18.5 parts of rubbing resin were premixed. Then 0.5 parts of carbon black, 6.75 parts of extender (ASP 200), 37.28 parts of titanium dioxide (R 900) and 2.25 parts of crosslinking catalyst (DBTO) are added and the mixture is mixed for 30 minutes under a high-speed dissolver stirrer. The mixture is then dispersed in a laboratory stirred ball mill for 1 to 1.5 h to a Hegman fineness of less than 12 and adjusted to the desired processing viscosity with further water, if necessary.
- ASP 200 extender
- R 900 titanium dioxide
- DBTO crosslinking catalyst
- binder dispersion A For the cathodically depositable electrocoat material, 36.81 parts of binder dispersion A are diluted with 52.5 parts of deionized water and 10.69 parts of pigment paste C are added to this mixture with stirring.
- the paint has a solids content of approx. 20% with an ash content of 25%.
- a titanium electrode coated with iridium oxide (dimensions 10 x 10 cm) serves as the anode and is immersed directly in the electrocoating material.
- steel sheets (dimensions approx. 10 x 20 cm) are coated automatically at 28 ° C with 280 V for 2 min.
- the layer thickness is approx. 20 ⁇ m.
- the sheets are immersed in the ultrafiltrate to rinse off adhering paint material and thus return it to the plunge pool.
- the KTL material is analyzed and compensated with binder and pigment paste.
- the meq acid analyzes show the development of the acidity in
- Figure 1 shows the plot of the meq-acid content against the "turnover" of the KTL bath (a turnover value of 1 means a complete
- Acid discharge 100 constant meq acid value
- Figure 2 shows the acid discharge based on the meq acid value after 0.3 turnover (the basis 0.3 turnover was chosen because the equilibrium between bath and ultrafiltrate has almost been reached at this point). .
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Prevention Of Electric Corrosion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19534534 | 1995-09-18 | ||
| DE19534534A DE19534534A1 (de) | 1995-09-18 | 1995-09-18 | Verfahren zur Entfernung der bei der kathodischen Elektrotauchlackierung freigesetzten Säure |
| PCT/EP1996/003845 WO1997011211A1 (de) | 1995-09-18 | 1996-09-02 | Verfahren zur entfernung der bei der kathodischen elektrotauchlackierung freigesetzten säure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0871802A1 true EP0871802A1 (de) | 1998-10-21 |
| EP0871802B1 EP0871802B1 (de) | 2000-01-05 |
Family
ID=7772455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96930151A Expired - Lifetime EP0871802B1 (de) | 1995-09-18 | 1996-09-02 | Verfahren zur entfernung der bei der kathodischen elektrotauchlackierung freigesetzten säure |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US6398944B1 (de) |
| EP (1) | EP0871802B1 (de) |
| AT (1) | ATE188518T1 (de) |
| DE (2) | DE19534534A1 (de) |
| ES (1) | ES2143778T3 (de) |
| WO (1) | WO1997011211A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19938886C1 (de) * | 1999-08-17 | 2001-02-01 | Dupont Automotive Coatings Gmb | Reinigungsmittel und Verfahren zur Reinigung von Ultrafiltrationsmembranen in Elektrotauchlackierungsanlagen |
| DE10235117B3 (de) * | 2002-08-01 | 2004-02-12 | EISENMANN Maschinenbau KG (Komplementär: Eisenmann-Stiftung) | Anlage zur kataphoretischen Tauchlackierung von Gegenständen |
| US20170096742A1 (en) * | 2015-10-02 | 2017-04-06 | Waste Hub | Electrochemical processes for acid whey treatment and reuse |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL128866C (de) | 1965-05-12 | |||
| GB1195871A (en) | 1967-02-10 | 1970-06-24 | Chemnor Ag | Improvements in or relating to the Manufacture of Electrodes. |
| US3682814A (en) * | 1970-09-25 | 1972-08-08 | Scm Corp | Cathodic electrocoating process |
| DE3423605A1 (de) | 1984-06-27 | 1986-01-09 | W.C. Heraeus Gmbh, 6450 Hanau | Verbundelektrode, verfahren zu ihrer herstellung und ihre anwendung |
| KR900006661B1 (ko) | 1986-03-03 | 1990-09-17 | 피이피이지이 인더스트리이즈 인코포레이팃드 | 내용해성 양극을 사용하는 양이온 전착방법 |
| US4879013A (en) * | 1986-03-03 | 1989-11-07 | Ppg Industries, Inc. | Method of cationic electrodeposition using dissolution resistant anodes |
| DE3642164A1 (de) | 1986-12-10 | 1988-06-23 | Basf Ag | Verfahren zum entfernen von saeure aus kathodischen elektrotauchlackier-baedern mittels elektrodialyse |
| DE4409270C1 (de) | 1994-03-18 | 1995-03-30 | Herberts Gmbh | Verfahren zur abwasserfreien kataphoretischen Tauchlackierung |
-
1995
- 1995-09-18 DE DE19534534A patent/DE19534534A1/de not_active Withdrawn
-
1996
- 1996-09-02 WO PCT/EP1996/003845 patent/WO1997011211A1/de not_active Ceased
- 1996-09-02 DE DE59604138T patent/DE59604138D1/de not_active Expired - Lifetime
- 1996-09-02 EP EP96930151A patent/EP0871802B1/de not_active Expired - Lifetime
- 1996-09-02 ES ES96930151T patent/ES2143778T3/es not_active Expired - Lifetime
- 1996-09-02 US US09/043,369 patent/US6398944B1/en not_active Expired - Fee Related
- 1996-09-02 AT AT96930151T patent/ATE188518T1/de not_active IP Right Cessation
-
2001
- 2001-11-02 US US10/001,734 patent/US20020060155A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9711211A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2143778T3 (es) | 2000-05-16 |
| ATE188518T1 (de) | 2000-01-15 |
| DE59604138D1 (de) | 2000-02-10 |
| DE19534534A1 (de) | 1997-03-20 |
| US20020060155A1 (en) | 2002-05-23 |
| WO1997011211A1 (de) | 1997-03-27 |
| EP0871802B1 (de) | 2000-01-05 |
| US6398944B1 (en) | 2002-06-04 |
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