EP1192013A2 - Verfahren zur reparaturlackierung von fehlstellen in einbrennlackierungen mit pulverlacken - Google Patents
Verfahren zur reparaturlackierung von fehlstellen in einbrennlackierungen mit pulverlackenInfo
- Publication number
- EP1192013A2 EP1192013A2 EP00938741A EP00938741A EP1192013A2 EP 1192013 A2 EP1192013 A2 EP 1192013A2 EP 00938741 A EP00938741 A EP 00938741A EP 00938741 A EP00938741 A EP 00938741A EP 1192013 A2 EP1192013 A2 EP 1192013A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- defects
- powder
- lacquer
- powder coating
- nir
- 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
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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/005—Repairing damaged coatings
-
- 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
- B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
- B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
- B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
-
- 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
- B05D3/02—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 baking
- B05D3/0254—After-treatment
- B05D3/0263—After-treatment with IR heaters
Definitions
- the invention relates to the refinishing of defects within baked-on coating layers with powder coating agents.
- Lacquer defects such as craters, dents, scratches or dirt inclusions within stoving coating layers, for example within stoved coating layers made from powder coatings, can be repaired with liquid lacquers.
- the repair process is time consuming and labor intensive. For example, the curing of the refinish requires exposure to elevated temperatures for a sufficiently long period of time. If the substrates to be repaired are temperature-sensitive substrates, the object temperature cannot be chosen as high as desired. In the case of substrates to be repaired with a mixed structure of temperature-sensitive and temperature-insensitive components, the procedure is generally such that the temperature-sensitive components before
- a particular problem with the refinishing of outer, visible, stoving topcoats made from powder lacquers with liquid lacquers is to carry out the refinishing in such a way that the repaired area is not noticeable, for example in terms of color matching or gloss.
- the repair of burnt-on powder clearcoat layers no essential one is allowed
- Deviation between the refractive indices of the baked powder clear coat and the cured repair clear coat result.
- Methods for repairing defects in lacquer layers while avoiding the usual mixing curing by convection or conventional IR radiation are known from DE-A-38 33 225, DE-A-197 20 894 and DE-A-197 20 946. The methods described there work with laser light as an energy source for the
- EP-A-0 842 710 a method for repairing defects in powder coating layers is known, in which a filler is inserted and connected to the defect prepared for repair, for example ground or milled out.
- the filler preferably corresponds to the dimensions of the prepared defect.
- EP-A-0 887 118 improves the method known from EP-A-0 842 710 with regard to the achievable quality of the repaired defect by carrying out the method known from EP-A-0 842 710 in such a way that the connection of filler body and Fault occurs under the influence of pressure.
- EP-A-0 842 710 and EP-A-0 887 118 avoid the disadvantages of repairing defects in powder coating layers by means of liquid lacquers, but are nevertheless complex because of the necessary provision of the filler, in particular in the area adapted to the defect to be repaired Dimension.
- the article "Rapid curing of powder coating” (Kai Bär, JOT 2/98, pages 26 to 29) describes that powder coatings can be cured with the aid of near-infrared radiation (NIR) of high intensity without causing significant heating of the substrate comes.
- NIR near-infrared radiation
- the NIR technology allows the melting and curing of powder coating in a single process step.
- the object of the invention is to provide an improved process for the refinishing of defects in stoving lacquers, in particular within usinemish lacquers produced using powder lacquers, which avoids the disadvantages of the prior art described.
- the method should in particular also be suitable for touch-up painting of mass-produced, industrially manufactured objects, in particular motor vehicles and their parts, for example in the context of or following a series painting.
- the invention therefore relates to a method for repairing imperfections in an embossed coating, which is characterized in that the defect which is ready for refinishing is coated with a powder coating agent and the applied powder coating is then melted and cured by exposure to near-infrared radiation (NIR).
- NIR near-infrared radiation
- the one or more imperfections within an enamel finish in particular within one out of one
- the stoving lacquers which have defects can be, for example, single-layer topcoats or lacquer layers arranged within a multi-layer lacquer, for example primers, filler layers and preferably outer, visible color and / or effect-giving or in particular transparent topcoat layers.
- the method according to the invention can preferably be used for the repair of imperfections within baked-on coating layers made from powder coatings, in particular powder clear coatings.
- the method according to the invention can particularly preferably be used in the repair of defects within stoving lacquers applied to motor vehicles and their parts.
- imperfections means that there are locally limited, for example up to a few square centimeters large, for example 1 mm 2 to 100 cm 2 large, defective areas within stove enamels.
- the defects can be, for example, damage such as scratches, for example assembly scratches, coating defects such as craters or dents, or inclusions of dirt.
- the powder coating compositions used for refinishing are aqueous preparations of the powder coating compositions, include so-called aqueous powder coating slurries.
- powder coatings themselves are preferably used in the process according to the invention.
- the powder coating materials used as repair lacquers in the process according to the invention contain a thermally curable self- or externally crosslinking agent
- Binder system preferably a crosslinking binder / hardener combination.
- Binder is to be understood as the film-forming higher molecular weight component of a thermosetting powder coating, which generally makes up at least 50% by weight of the underlying binder / hardener combination, while the hardener component is generally a maximum of 50% by weight within this combination.
- the binder base is not subject to any fundamental restrictions.
- customary binders used for powder coatings are suitable. Examples are polyester resins, (meth) acrylic copolymers, epoxy resins, phenolic resins, polyurethane resins, and suoxane resins.
- the binders have, for example, glass transition temperatures of 30 to 120 ° C., preferably below 90 ° C., and have, for example, intermediate molar masses (Mn) of 500 to 20,000, preferably below 10,000.
- the hardeners have e.g. number average molecular weights (Mn) of 84 to 3000, preferably less than 2000. Different binders and hardeners can be mixed with one another.
- Binder and hardener carry complementary reactive functional groups which allow a thermal crosslinking reaction of the powder coating, for example by condensation reactions and / or addition reactions.
- functional groups are carboxyl groups, epoxy groups, aliphatic or aromatic hydroxyl groups, isocyanate groups, blocked
- Isocyanate groups anhydride groups, primary or secondary amino groups, blocked amino groups, N-heterocyclic groups capable of ring-opening addition, such as e.g. Oxazoline groups, (meth) acryloyl groups, CH-acidic groups such as e.g. Acetoacetate groups.
- the various functional groups can be present on the binder and / or hardener at the same time.
- the binders and hardeners contain on average at least 2 functional groups per molecule.
- the ratio of binder to hardener is generally, for example, 98: 2 to 50:50. It is preferably between 95: 5 and 70:30.
- binder / hardener systems customary in powder coatings are polyester resins with low molecular weight epoxy or hydroxyalkylamide hardeners, epoxy / polyester hybrid systems, epoxy resins with dicyandiamide hardeners, carboxylic acid hardeners or phenolic hardeners, hydroxy-functional polyesters or (meth) acrylic copolymers with blocked polyisocyanates (epoxy) copolymers (epoxy-functional), epoxy-functional copolymers With
- Carboxylic acid or carboxylic acid anhydride hardeners are provided.
- those powder clear lacquers are preferably used as repair lacquers in the process according to the invention which contain epoxy-functional (meth) acrylic copolymers, in particular as binders
- glycidyl (meth) acrylate copolymers with an epoxy equivalent weight between 250 and 700 and as hardener one or more low molecular weight and / or polymeric compounds with an average of 2 or more carboxyl functions per molecule and / or anhydrides thereof.
- Solid aliphatic hardeners are preferred
- Dicarboxylic acids and / or their anhydrides such as, in particular, dodecanedicarboxylic acid, which can also be used in a mixture with carboxyl-functional polyesters.
- the powder coating materials used in the process according to the invention can contain conventional powder coating additives in customary proportions of, for example, 0J to 5% by weight.
- additives are leveling agents, degassing agents such as benzoin, antioxidants, light stabilizers, matting agents, coloring and / or effect-giving inorganic and / or organic pigments and / or fillers, dyes, adhesion promoters, lubricants, catalysts and rheology control agents.
- opaque pigments or effect pigments are used, they are used to repair defects in color and / or effect paint layers
- Powder coating agent If no or colorless pigments, e.g. Micronized titanium dioxide or silicon dioxide are used, so these are powder clear lacquer coating materials which can be used to repair defects in clear lacquer layers.
- Powder coatings can be carried out by the customary methods for producing powder coatings, for example by extruding the powder coating formulated in the form of a paste-like melt by dry mixing all the necessary components, cooling the melt, coarse comminution, fine grinding and, if appropriate, subsequent sieving to the desired particle size, for example to medium particle sizes from 10 to 90 ⁇ m.
- the process according to the invention can be carried out using fine-grain powder coating material, for example with average particle sizes of 1 to 40 ⁇ m.
- Fine-grained powder coating or fine-grain powder coating can be produced in a targeted manner, but occurs, for example, in powder coating production or in powder coating application as an undesirable material per se and can therefore be used expediently in the process according to the invention.
- the powder coatings can also be used as an aqueous powder coating slurry.
- they can be converted into an aqueous powder coating slurry, for example by dry or wet grinding or by intensive dispersion of a powder coating melt or organic powder coating solution, which can optionally be freed from organic solvent by distillation.
- the powder coating materials used in the process according to the invention preferably have the same solid composition as that used to prepare the repairing, flawed enamel coating used. This is preferably a repair of defects in baked powder coating layers. Powder coatings with an identical composition are used both in the initial coating and in the refinishing according to the invention. This is particularly advantageous when repairing
- defects in a stove enamelling are repaired using powder coatings as repair lacquers.
- the defects can be ready for refinishing or they can be prepared for refinishing, for example by grinding, milling or machining the defects with a laser.
- the defects are at least cleaned before applying the powdered repair lacquer.
- it is expedient to protect the flawlessly coated areas of the surface from contamination for example by covering, masking or by applying a peelable varnish around the defects to be repaired.
- the defects that are ready for refinishing can be coated with the powder coating agent regardless of whether they are on horizontal or vertical surfaces, for example mechanically, for example by sprinkling, brushing or brushing, or the application is carried out by spraying on with the customary application devices.
- Mechanical application is particularly suitable for fine-grained powder coating material.
- the spraying can be carried out, for example, with electrostatic assistance, e.g. with the help of corona or tribo spray organs.
- the powder coating composition applied to the defect is melted and cured by irradiation with NIR radiation, preferably with high-intensity NIR radiation.
- NIR radiation is short-wave infrared radiation in the wavelength range from approximately 760 to approximately 1500 nm, preferably 760 to 120 nm
- NIR emitters are commercially available (for example from the company
- high-performance halogen lamps with a radiation density of generally more than 1 W / cm 2 , preferably more than 10 W / cm 2 , for example up to 15 MW / m 2 .
- the emitters for example, reach an emitter surface temperature (filament temperature) between 2000 and 3000 K.
- Suitable emitters have, for example, an emission spectrum with a maximum between 750 and 1200 nm.
- the irradiation period in the method according to the invention is, for example, 1 to 300 seconds.
- the powder coating applied to repair the defect melts and hardens within 1 to 300, for example
- Seconds preferably within 5 to 60 seconds.
- the irradiation can be carried out in a belt system equipped with one or more NIR emitters or with an NIR emitter which is positioned in front of the object or the site to be irradiated.
- the first option is useful, for example, when refinishing individual parts or objects in which several defects are to be repaired in one step.
- the belt speed and thus the irradiation time can be varied.
- 1 to 7 m / min can be set, which can correspond, for example, to irradiation times of 2 to 20 seconds.
- the distance between the NIR emitter and the object surface can e.g. 1 to 60 cm, preferably 4 to 20 cm.
- the NIR radiator is positioned in front of the object or location to be irradiated.
- the irradiation time can be, for example, 1 to 300 seconds, the object distance, for example, 1 to 60 cm, preferably 4 to 20 cm.
- the various irradiation parameters, such as belt speed or irradiation duration, object distance, radiation power of the NIR emitter used can be adapted by the person skilled in the art according to the needs of the respective repair task.
- the powder coating applied to repair imperfections has hardened by means of NIR radiation, it may be expedient to smooth the repaired area, for example by polishing.
- the color and / or effect basecoat layer can first be applied from a basecoat coating agent to the flaw in the stoving lacquer ready for repair lacquering, if necessary ventilated and / or baked and then a clear powder coating is applied and melted and cured by NIR radiation.
- Powder repair lacquer slurry melting and hardening of the (dried) powder lacquer layer by NIR radiation, optionally overcoating with further coating layers.
- NIR radiation for example, in the case of one to be repaired
- a powder filler is applied to the defect in a filler layer and melted and hardened by NIR radiation before it is overcoated with basecoat and clearcoat, for example.
- overpainting with basecoat and clearcoat can take place as part of the initial painting or as part of a refinishing on the object that has already been painted.
- Another example is a defect to be repaired within a clear lacquer layer of a color and / or effect basecoat-clear lacquer two-layer lacquer.
- a powder clear coat can be applied to the flaw that is ready for repair, for example a flaw that is not sanded down to the basecoat layer or even deeper, and
- the method according to the invention permits the repair lacquering of defects in stoving lacquers, in particular within stoving lacquers produced using powder lacquers. The ones described at the beginning
- the method is suitable for touch-up painting of mass-produced, industrially manufactured objects, in particular it is suitable for repairing defects within powder coating layers, in particular powder topcoat and powder clearcoat layers, which are produced in the course of automobile or automotive part series coating.
- Powder clearcoat is a dirt particle within the powder clearcoat.
- the dirt particle is removed by sanding without penetrating the basecoat.
- An approx. 0.5 cm 2 defect in the powder clear coat layer, ready for repair, is created.
- the area to be repaired is separated from the flawless surface by masking with heat-resistant film.
- the same powder clear coat as the powder clear coat previously used to produce the first coat is applied to the defect ready for repair by electrostatic spraying.
- An NIR emitter from Industrie SerVis is positioned at a distance of 100 mm from the defect coated with powder clear lacquer. It is irradiated for 8 seconds with a power of 400 kW / m 2 , within which the powder clear lacquer melts and hardens completely.
- the cover sheet is then removed and the repaired area is polished over a small area using a commercially available grinding paste.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19927041A DE19927041A1 (de) | 1999-06-14 | 1999-06-14 | Verfahren zur Reparaturlackierung von Fehlstellen in Einbrennlackierungen mit Pulverlacken |
DE19927041 | 1999-06-14 | ||
PCT/EP2000/005092 WO2000076678A2 (de) | 1999-06-14 | 2000-06-05 | Verfahren zur reparaturlackierung von fehlstellen in einbrennlackierungen mit pulverlacken |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1192013A2 true EP1192013A2 (de) | 2002-04-03 |
EP1192013B1 EP1192013B1 (de) | 2003-10-01 |
Family
ID=7911158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00938741A Expired - Lifetime EP1192013B1 (de) | 1999-06-14 | 2000-06-05 | Verfahren zur reparaturlackierung von fehlstellen in einbrennlackierungen mit pulverlacken |
Country Status (8)
Country | Link |
---|---|
US (1) | US7018682B1 (de) |
EP (1) | EP1192013B1 (de) |
JP (1) | JP2003501260A (de) |
AT (1) | ATE250985T1 (de) |
AU (1) | AU5401100A (de) |
DE (2) | DE19927041A1 (de) |
ES (1) | ES2203485T3 (de) |
WO (1) | WO2000076678A2 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6280800B1 (en) * | 2000-01-18 | 2001-08-28 | E. I. Du Pont De Nemours And Company | Process for coating metallic substrate surfaces |
US6743466B2 (en) * | 2001-08-03 | 2004-06-01 | E. I. Du Pont De Nemours And Company | Process for repairing coated substrate surfaces |
US20040219385A1 (en) * | 2002-08-23 | 2004-11-04 | Rene Mattern | Process for curing powder coatings |
DE10248943A1 (de) * | 2002-10-21 | 2004-04-29 | Volkswagen Ag | Verfahren zur Reparatur lokal begrenzter Fehlstellen in einer Lackierung |
DE10302486A1 (de) * | 2003-01-23 | 2004-07-29 | Volkswagen Ag | Verfahren zur Herstellung einer Lackierung auf einem Substrat |
US7544386B2 (en) * | 2005-11-18 | 2009-06-09 | Basf Corporation | Method of matching a color in a powder paint system including metallic pigment with a color of a liquid paint system |
EP1854552B1 (de) * | 2006-05-11 | 2008-09-17 | E.I. Du Pont De Nemours And Company | Verfahren zur Reparaturlackierung von Fahrzeugen |
CN102407221B (zh) * | 2011-09-08 | 2014-02-19 | 金发科技股份有限公司 | 一种用聚芳醚酮树脂修补搪瓷釜的方法 |
US10030305B2 (en) * | 2015-11-19 | 2018-07-24 | General Electric Company | Method to protect features during repair cycle |
PT3436506T (pt) * | 2016-04-01 | 2020-05-22 | Akzo Nobel Coatings Int Bv | Processo para reparar uma película de revestimento, utilização de um primário de adesão em tal processo e substrato com uma película de revestimento reparada |
DE102017125597A1 (de) * | 2017-11-02 | 2019-05-02 | Value & Intellectual Properties Management Gmbh | 3D-Metalldruckverfahren und Anordnung für ein solches |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4218493A (en) * | 1977-12-02 | 1980-08-19 | The Continental Group, Inc. | Electrostatic repair coating |
GB2210291B (en) * | 1987-09-30 | 1991-01-30 | Kansai Paint Co Ltd | Method of remedying coating |
US5059446A (en) * | 1990-02-14 | 1991-10-22 | Armco Inc. | Method of producing plastic coated metal strip |
AU665876B2 (en) * | 1992-12-15 | 1996-01-18 | Nippon Paint Co., Ltd. | Two coat one bake coating method |
JP3666946B2 (ja) * | 1995-09-19 | 2005-06-29 | 本田技研工業株式会社 | 塗装補修ライン |
JPH09137089A (ja) * | 1995-11-17 | 1997-05-27 | Kansai Paint Co Ltd | 近赤外光硬化型パテ組成物 |
DE19720946A1 (de) * | 1996-05-25 | 1997-11-27 | Volkswagen Ag | Vorrichtung und Verfahren zur Reparatur lokal begrenzter Lackfilmfehler |
DE19720945A1 (de) * | 1996-05-25 | 1997-11-27 | Volkswagen Ag | Verfahren zur Reparatur lokal begrenzter Lackfilmfehler |
DE19720894A1 (de) | 1996-05-25 | 1997-11-27 | Volkswagen Ag | Vorrichtung und Verfahren zur Reparatur lokal begrenzter Lackfilmfehler |
DE19635447C1 (de) * | 1996-08-31 | 1997-11-20 | Herberts Gmbh | Verfahren zur Herstellung einer Reparaturlackierung |
DE19646956C1 (de) * | 1996-11-13 | 1998-05-20 | Daimler Benz Ag | Verfahren zur Reparatur kleiner Lackfehler in Lackschichten |
CA2289794C (en) * | 1997-05-15 | 2003-07-08 | Kansai Paint Co., Ltd. | Granulated powdery paint and process for producing the same |
DE19727324C1 (de) * | 1997-06-27 | 1999-04-01 | Daimler Benz Ag | Verfahren und Vorrichtung zur Reparatur kleiner Lackfehler in Lackschichten |
DE19852268C1 (de) * | 1998-11-13 | 2000-07-13 | Herberts Gmbh | Verfahren zur Härtung von Pulverlacken |
-
1999
- 1999-06-14 DE DE19927041A patent/DE19927041A1/de not_active Withdrawn
-
2000
- 2000-06-05 DE DE50003913T patent/DE50003913D1/de not_active Expired - Fee Related
- 2000-06-05 WO PCT/EP2000/005092 patent/WO2000076678A2/de active IP Right Grant
- 2000-06-05 AU AU54011/00A patent/AU5401100A/en not_active Abandoned
- 2000-06-05 AT AT00938741T patent/ATE250985T1/de not_active IP Right Cessation
- 2000-06-05 ES ES00938741T patent/ES2203485T3/es not_active Expired - Lifetime
- 2000-06-05 US US10/018,896 patent/US7018682B1/en not_active Expired - Fee Related
- 2000-06-05 JP JP2001502994A patent/JP2003501260A/ja active Pending
- 2000-06-05 EP EP00938741A patent/EP1192013B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0076678A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE19927041A1 (de) | 2000-12-21 |
JP2003501260A (ja) | 2003-01-14 |
WO2000076678A3 (de) | 2001-08-02 |
WO2000076678A2 (de) | 2000-12-21 |
DE50003913D1 (de) | 2003-11-06 |
ES2203485T3 (es) | 2004-04-16 |
US7018682B1 (en) | 2006-03-28 |
EP1192013B1 (de) | 2003-10-01 |
AU5401100A (en) | 2001-01-02 |
ATE250985T1 (de) | 2003-10-15 |
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