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EP0328963B2 - Procédé de polissage de surfaces laquées - Google Patents
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EP0328963B2 - Procédé de polissage de surfaces laquées - Google Patents

Procédé de polissage de surfaces laquées Download PDF

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Publication number
EP0328963B2
EP0328963B2 EP89101876A EP89101876A EP0328963B2 EP 0328963 B2 EP0328963 B2 EP 0328963B2 EP 89101876 A EP89101876 A EP 89101876A EP 89101876 A EP89101876 A EP 89101876A EP 0328963 B2 EP0328963 B2 EP 0328963B2
Authority
EP
European Patent Office
Prior art keywords
polishing
polished
lacquer
paint
plastic
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
Application number
EP89101876A
Other languages
German (de)
English (en)
Other versions
EP0328963A3 (en
EP0328963A2 (fr
EP0328963B1 (fr
Inventor
Hans-Joachim Dr. Höfer
Manfred Dr. Schönfelder
Horst Lauhoff
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.)
Bayer AG
Original Assignee
Bayer 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=6347399&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0328963(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0328963A2 publication Critical patent/EP0328963A2/fr
Publication of EP0328963A3 publication Critical patent/EP0328963A3/de
Application granted granted Critical
Publication of EP0328963B1 publication Critical patent/EP0328963B1/fr
Publication of EP0328963B2 publication Critical patent/EP0328963B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes

Definitions

  • the present invention relates to a method for polishing highly elastic lacquer surfaces, in particular plastic lacquer surfaces, in which the lacquer surface to be polished is kept at a maximum temperature of + 5 ° C. by passing a cold gas over it.
  • Plastic parts are increasingly used, particularly in automotive engineering, e.g. Saving weight and thus fuel, avoiding minor damage and allowing more freedom for design. These parts generally have to be painted to give them sufficient resistance to the effects of weather or chemical substances (fuel, cleaning agents) or to make them scratch-resistant. For body parts made of plastic, painting in body color is also required.
  • the object on which the invention was based was to provide a new process for polishing lacquer surfaces, which also polishes highly elastic lacquer films, in particular those on plastics or, in particular in the case of "on-line lacquering", by the mixed construction method Motor vehicle bodies, also permitted on metals.
  • the invention relates to a method for polishing ground, highly elastic lacquer surfaces based on two-component polyurethane lacquers, characterized in that the surface to be polished is polished during the polishing process by means of a gas passed over the surface to be polished at a maximum temperature of -5 ° C. at a Temperature of max. + 5 ° C.
  • the lacquer surfaces to be polished by the process according to the invention are highly elastic lacquer films which have an elongation at break according to DIN 53 455 of more than 60% (clear lacquers) or more than 30% (pigmented lacquers). Paint films of this type are produced in the known painting of plastics, in particular automobile body parts made of plastic or also of metals in the case of "on-line painting" according to the mixed construction of bodies (the plastics are, for example, those made of polyurethanes , Polycarbonates, polypropylene or based on acrylonitrile-butadiene copolymers or their blends with polycarbonates) using two-component polyurethane paints with a highly elastic setting, as described, for example, in "Painting car body parts made of flexible plastics with ®Desmodur / ®Desmophen” Bayer AG, Leverkusen, for the paint area, issue 6.80 (Order No. KL 44 257).
  • polishing is generally carried out using the known polishing aids (polishing pastes) as described, for example, in "Römpps Chemie-Lexikon / Otto-Albrecht-Neumüller", Volume 5, pp. 3269 ff .; Stuttgart 1987; Franckh'sche Verlagbuch Stuttgart W. Keller & & o. are described.
  • Suitable polishing devices for the process according to the invention are, for example, compressed air polishing devices or electrically operated polishing devices of the type known per se.
  • Grinding tools of the type described in DE-AS 2 145 714 are also very suitable, provided that the grinding wheel described there is replaced by a corresponding polishing wheel, for example covered with a lambskin.
  • the surface to be polished is kept at a temperature of at most + 5 ° C., preferably at most -10 ° C., by means of a gas passed over the surface to be polished during the polishing process.
  • a gas passed over the surface to be polished during the polishing process can be done, for example, using the tool described in DE-AS 2 145 714 with permanent gassing of the surface to be polished during the polishing process with a cold gas.
  • a variant of the tool described in DE-AS 2 145 714 according to which the cooling gas is introduced in the middle parallel to the rotating axis is also conceivable.
  • the way in which the cooling gas is conducted is not essential to the invention, provided that the gas cooling mentioned ensures that the lacquer surface to be polished during the polishing process is at or below the above-mentioned maximum temperature.
  • the gas used for cooling in turn has a maximum temperature of -5 ° C, preferably from -20 ° C to -60 ° C.
  • Evaporating liquid air or evaporating liquid nitrogen, for example, can be used well as cooling gas.
  • the diameter of the polishing disc be max. To hold 30 cm, preferably at about 15 to 25 cm.
  • the method according to the invention allows for the first time an economical repair of elastic paints, the grinding and polishing process being coordinated.
  • damaged paint films can first be subjected to a grinding process using customary special abrasive papers, such as those offered by 3M Kunststoff GmbH, Neuss, under the name "®Finesse-it” system.
  • the grain size of the sanding paper used here should represent a compromise between the desired high removal rate (short duration of the sanding process) and the avoidance of deep, difficult-to-polish sanding marks, which occur especially with coarse grain. This can be achieved with papers that have a grain size of approximately 800 to approximately 2,000 (preferably 1,200 to 1,500); To avoid major damage, these sanding papers should have a small diameter (approx. 3 cm) and be punched out (not cut). Even highly elastic paint systems can be sanded in this way within a few seconds. If a shorter process time is required, the grinding process can be carried out using a rotary grinding device.
  • the polished lacquer surface is then polished according to the invention.
  • the weight ratio of Desmophen A 365 (inelastic hydroxyl-containing polyacrylate resin) and Desmophen 670 (elasticizing polyester) was varied in accordance with Table 1 below.
  • Formulation 1 is very hard, formulation 4 is highly elastic (cf. the elongations at break in the clear lacquer film at room temperature).
  • Formulation 4 corresponds approximately to the highest level of elasticity in practical use (e.g. for clear coats for the painting of plastic parts in the front and rear areas of vehicles that are subject to impact).
  • the polyisocyanate component was used in an amount corresponding to an NCO / OH equivalent ratio of 1.2: 1.
  • the clearcoats also contained the additives listed below (the percentages relate to percentages by weight, based on binder (solid resin)): Catalyst 1) 0.2% Leveling aids 2) 0.2% Sunscreen 3) 1.0% Sunscreen 4) 1.0% 1) Triethylenediamine ®Dabco 33 LV from Biesterfeld, Hamburg; 2) ®Baysilon paint additive OL 17 from Bayer AG, Leverkusen; 3) ®Tinuvin 292 from Ciba-Geigy AG, Basel; 4) ®Tinuvin 900 from Ciba-Geigy AG, Basel.
  • the clear lacquers contained as solvent a mixture of ethyl acetate, butyl acetate, methoxypropyl acetate, methyl ethyl ketone and xylene in a weight ratio of 1: 1: 1: 1: 1.
  • the solids content was 49.5% by weight.
  • the clearcoat was applied by compressed air spraying, the dry film thickness of the clearcoat was approx. 30 »m.
  • Fiber-it sandpaper ( ⁇ approx. 3 cm; grit approx. 1,500) was used as sandpaper and sanded by hand (duration approx. 10 to 15 s; sanded surface approx. 3 cm x 3 cm).
  • polishing was carried out using a cold gas polishing device with a rotating polishing surface, care being taken to keep the surface at a temperature of below -10 ° C. while polishing, while continuously evaporating liquid nitrogen (temperature at the outlet opening approx. -40 ° C.) exhibited.
  • the surface of the polishing device consisted of a lambskin, the diameter of the rotating disc was 20 cm, the speed was 2,500 rpm.
  • Fiber-it paste was used as a polishing aid. After a polishing time of 30 seconds the following results (gloss values according to Gardner; 60 ° C; 20 ° C values in brackets) were achieved.
  • the initial shine is restored, and there are no traces of grinding or polishing. Even the most elastic setting can be tilted and polished immediately after the oven has dried.
  • lacquers which are not very flexible can also be polished relatively easily conventionally, so that the use of cold gas can generally no longer bring about any improvement. Even medium-elastic clear coats (elongation at break> 60 to 70% at room temperature) can no longer be polished conventionally. In the case of highly elastic systems, the initial gloss can in principle no longer be restored even by prolonged polishing (several minutes: which cannot be accepted in practice anyway).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (3)

  1. Procédé pour polir des surfaces de revêtements à base de peintures de polyuréthanne à deux composants, meulées, à haute élasticité, caractérisé en ce que, durant l'opération de polissage, on maintient la surface à polir à une température maximale de +5°C à l'aide d'un gaz envoyé sur la surface à polir, lui-même à une température maximale de -5°C.
  2. Procédé selon la revendication 1, caractérisé en ce que la surface de revêtement à polir a, à température ambiante, un allongement à la rupture selon DIN 53 455 supérieur à environ 30 %.
  3. Procédé selon les revendications 1 et 2, caractérisé en ce que la surface de revêtement à polir est la surface d'un revêtement à base de résines synthétiques appliqué sur matière plastique et/ou métal.
EP89101876A 1988-02-13 1989-02-03 Procédé de polissage de surfaces laquées Expired - Lifetime EP0328963B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3804588 1988-02-13
DE3804588A DE3804588A1 (de) 1988-02-13 1988-02-13 Verfahren zum polieren von lackoberflaechen

Publications (4)

Publication Number Publication Date
EP0328963A2 EP0328963A2 (fr) 1989-08-23
EP0328963A3 EP0328963A3 (en) 1990-01-31
EP0328963B1 EP0328963B1 (fr) 1992-10-28
EP0328963B2 true EP0328963B2 (fr) 1995-02-22

Family

ID=6347399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89101876A Expired - Lifetime EP0328963B2 (fr) 1988-02-13 1989-02-03 Procédé de polissage de surfaces laquées

Country Status (4)

Country Link
EP (1) EP0328963B2 (fr)
JP (1) JPH0655292B2 (fr)
DE (2) DE3804588A1 (fr)
ES (1) ES2035963T5 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01295751A (ja) * 1988-03-15 1989-11-29 Linde Ag 大気温度以下の温度でラック塗装部を研削及び／又は研磨する方法及び装置
DE3819973C1 (fr) * 1988-06-11 1988-12-29 Bayerische Motoren Werke Ag, 8000 Muenchen, De
GB9310107D0 (en) 1993-05-17 1993-06-30 Minnesota Mining & Mfg Sanding and polishing systems
DE19623931C1 (de) * 1996-06-15 1997-07-17 Herberts Gmbh Verfahren zum Polieren und/oder Schleifen von Lackoberflächen und Kaltgasbearbeitungsgerät zur Durchführung des Verfahrens
EP1364996A1 (fr) * 2002-05-25 2003-11-26 Martin Nielaba Mélange de vernis et ses utilisations
ITUB20156872A1 (it) * 2015-12-09 2017-06-09 Eurosider Sas Di Milli Ottavio & C Dispositivo e metodo per la verniciatura di manufatti verniciati.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539386B2 (fr) * 1972-08-30 1980-10-11
US3934379A (en) * 1974-09-03 1976-01-27 Wisconsin Alumni Research Foundation Removal of built up layers of organic coatings
DE2653487C3 (de) * 1976-11-25 1980-03-06 Ewald 4970 Bad Oeynhausen Siekmann Polierwalze
DE3436132A1 (de) * 1983-10-03 1985-04-11 Air Products And Chemicals, Inc., Allentown, Pa. Verfahren zur entfernung von anstrichschichten
DE3622329C1 (de) * 1986-07-03 1987-07-30 Messer Griesheim Gmbh Verfahren zum Entfernen von auf Werkstuecken befindlichen Farbschichten
DE3819973C1 (fr) * 1988-06-11 1988-12-29 Bayerische Motoren Werke Ag, 8000 Muenchen, De

Also Published As

Publication number Publication date
ES2035963T5 (es) 1995-08-16
JPH0655292B2 (ja) 1994-07-27
EP0328963A3 (en) 1990-01-31
DE58902528D1 (de) 1992-12-03
DE3804588A1 (de) 1989-05-11
EP0328963A2 (fr) 1989-08-23
JPH0231865A (ja) 1990-02-01
ES2035963T3 (es) 1993-05-01
EP0328963B1 (fr) 1992-10-28

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