EP0282494B1 - Verfahren zur entfernung von oberflächenstörungen verursachenden verunreinigungen aus elektrotauchlackbädern - Google Patents

Verfahren zur entfernung von oberflächenstörungen verursachenden verunreinigungen aus elektrotauchlackbädern Download PDF

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Publication number
EP0282494B1
EP0282494B1 EP87901259A EP87901259A EP0282494B1 EP 0282494 B1 EP0282494 B1 EP 0282494B1 EP 87901259 A EP87901259 A EP 87901259A EP 87901259 A EP87901259 A EP 87901259A EP 0282494 B1 EP0282494 B1 EP 0282494B1
Authority
EP
European Patent Office
Prior art keywords
electrophoretic coating
coating baths
eliminating surface
defect inducing
filtration
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
Application number
EP87901259A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0282494A1 (de
Inventor
Klaus Arlt
Theodora Dirking
Karl-Heinz Josten
Hans-Joachim Streitberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Farben und Fasern AG
Original Assignee
BASF Lacke und Farben AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6286089&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0282494(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BASF Lacke und Farben AG filed Critical BASF Lacke und Farben AG
Priority to AT87901259T priority Critical patent/ATE45397T1/de
Publication of EP0282494A1 publication Critical patent/EP0282494A1/de
Application granted granted Critical
Publication of EP0282494B1 publication Critical patent/EP0282494B1/de
Expired legal-status Critical Current

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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
    • C25D13/24—Regeneration of process liquids

Definitions

  • the invention relates to a method for removing contaminants causing surface defects from electrocoating baths.
  • the present invention is preferably applicable to cathodically depositable lacquers. However, it can also be used in anodically depositable systems.
  • the process according to the invention is particularly suitable for removing contaminants which cause surface defects from electrocoat materials which contain cationic amine-modified epoxy resins as binders.
  • Lacquer systems of this type are disclosed, for example, in the following patent documents: US Pat. No. 3,799,854, US Pat. No. 3,984,299, US Pat. No. 4,031,050, US Pat. No. 4,252,703, US Pat. No. 4,332,711 and DE-PS 31 08 073.
  • the object of the present invention was to develop a method by which electro-immersion baths contaminated with substances causing surface disturbances can be decontaminated to such an extent that qualitatively satisfactory coatings are obtained.
  • the electrocoat material in addition to the usual cleaning operations, is depressurized via an adsorbent which is present as flakes or in another finely divided form and consists of homo- or copolymers of ethylene, propylene, butene-1 or butene-2, which optionally contain other non-polar comonomers, is filtered.
  • Mixtures of adsorbents can also be used.
  • the adsorbents should be present as solid substances with a large adsorption area (for example as flakes or in another finely divided form).
  • a flake material consisting of fibrous polypropylene is very particularly preferably used as the adsorbent. This material is sold by 3M under the name “3M oil sorbent (status 1985).
  • the 3M product information shows that the «3M oil sorbent» can be used in the environmental protection and occupational safety area. It is used there in the form of rolls, veils, pillows, hoses and cloths and is used to absorb thin oil films and pools of oil on water, puddles and pools of water as well as to remove dangerous liquid working materials that are spilled during storage, filling or transportation, for example .
  • the impurities which are present in very low concentrations and cause surface defects can be removed from the electrocoat materials to such an extent that they can no longer be detected using the analytical methods currently available, using pressure-free filtration using the adsorbents according to the invention.
  • the multi-component, complex composition electrocoat material by means of an unpressurized filtration over one effective adsorbent having a large adsorption area can be selectively cleaned of impurities causing surface defects without disadvantageous changes in the paint composition.
  • filter bags filled with absorbent are installed in the paint circuit of the electrocoating system in such a way that the additional filtration can be switched on or off as required.
  • the filtration rate can be adapted to changing process conditions by varying the volume and number of filter bags used.
  • An electrodeposition bath contaminated with a triglyceride of glycerin, oleic acid, stearic acid and palmitic acid and an anion-active emulsifier (content: 360 m 3 electrodeposition lacquer based on a cationic amine-modified epoxy resin binder) was filled over 12 with a filter bag filled with a fibrous polypropylene flake material (6 large parallel bags) with a volume of 15 to 20 liters and 6 small parallel bags with a volume of 7 to 10 liters, which were filled with 750 to 1,000 or 350 to 500 grams of flake material; small and large bags placed one behind the other).
  • the filtration rate was 3.6 m 3 per hour and the filters were changed every 8 hours.

Landscapes

  • 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)
  • Cell Separators (AREA)
EP87901259A 1985-11-15 1986-10-29 Verfahren zur entfernung von oberflächenstörungen verursachenden verunreinigungen aus elektrotauchlackbädern Expired EP0282494B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87901259T ATE45397T1 (de) 1985-11-15 1986-10-29 Verfahren zur entfernung von oberflaechenstoerungen verursachenden verunreinigungen aus elektrotauchlackbaedern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853540575 DE3540575A1 (de) 1985-11-15 1985-11-15 Verfahren zur entfernung von oberflaechenstoerungen verursachenden verunreinigungen aus elektrotauchlackbaedern
DE3540575 1985-11-15

Publications (2)

Publication Number Publication Date
EP0282494A1 EP0282494A1 (de) 1988-09-21
EP0282494B1 true EP0282494B1 (de) 1989-08-09

Family

ID=6286089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87901259A Expired EP0282494B1 (de) 1985-11-15 1986-10-29 Verfahren zur entfernung von oberflächenstörungen verursachenden verunreinigungen aus elektrotauchlackbädern

Country Status (6)

Country Link
US (1) US4956096A (es)
EP (1) EP0282494B1 (es)
BR (1) BR8607210A (es)
DE (2) DE3540575A1 (es)
ES (1) ES2005540A6 (es)
WO (1) WO1987003016A2 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3836973A1 (de) * 1988-10-31 1990-05-03 Basf Lacke & Farben Filter zur entfernung von hydrophoben substanzen aus elektrotauchlacken
US6803092B2 (en) 2001-06-26 2004-10-12 3M Innovative Properties Company Selective deposition of circuit-protective polymers
JP7441300B2 (ja) * 2019-07-16 2024-02-29 ビーエーエスエフ コーティングス ゲゼルシャフト ミット ベシュレンクテル ハフツング エレクトロコーティング浴を洗浄するための方法およびそのための装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5669395A (en) * 1979-11-09 1981-06-10 Ebara Infilco Co Ltd Treatment of electrodeposition painting bath liquid

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336138A (en) * 1975-07-26 1982-06-22 Toyobo Co., Ltd. Permeation separation apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5669395A (en) * 1979-11-09 1981-06-10 Ebara Infilco Co Ltd Treatment of electrodeposition painting bath liquid

Also Published As

Publication number Publication date
US4956096A (en) 1990-09-11
BR8607210A (pt) 1988-09-13
DE3540575A1 (de) 1987-05-27
WO1987003016A3 (fr) 1987-07-02
EP0282494A1 (de) 1988-09-21
DE3664934D1 (en) 1989-09-14
WO1987003016A2 (en) 1987-05-21
ES2005540A6 (es) 1989-03-16

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