EP0963795B1 - Verfahren zum Pulverlackieren von Bauteilen - Google Patents
Verfahren zum Pulverlackieren von Bauteilen Download PDFInfo
- Publication number
- EP0963795B1 EP0963795B1 EP98110718A EP98110718A EP0963795B1 EP 0963795 B1 EP0963795 B1 EP 0963795B1 EP 98110718 A EP98110718 A EP 98110718A EP 98110718 A EP98110718 A EP 98110718A EP 0963795 B1 EP0963795 B1 EP 0963795B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder coating
- components
- component
- conductive
- process according
- 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
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
Definitions
- the invention relates to a method according to the preamble of patent claim 1.
- Known methods for powder coating are used on components electrically conductive materials, mainly made of metal.
- On the components for example, positive, charge applied before the one with an opposite one Cargo, e.g. negatively charged, powder paint sprayed on becomes. Because of the opposite charges, the powder coating adheres to the component.
- the adhesive powder coating is then baked at an elevated temperature.
- the process is the powder coating of components made of electrically non-conductive Materials not possible because no load can be applied to such components.
- the material for components is known per se electrically non-conductive materials (polyester) before shaping (extrusion) to mix with electrically conductive substances or particles and the components after the shape as with electrically conductive materials.
- the master solution is dipped and dipped onto the plastic molded component a predetermined draining time electrostatically applied a resin powder thereon, that melted during a subsequent heat treatment and finally is cured.
- a notable layer thickness and a regular layer To achieve the powder coating, the workpiece is before electrostatic adhesion of the powder at 100 ° C or slightly more, so that the workpiece for the powder still has a predetermined residual heat.
- the key solution can be one contain quaternary ammonium compound.
- FR-A-27 13 518 it is known to paint plastic objects with a Pre-treat the conductive liquid, for example an aqueous solution with alkyl ammonium is. After wetting can be dried. After painting is cooled.
- a Pre-treat the conductive liquid for example an aqueous solution with alkyl ammonium is. After wetting can be dried. After painting is cooled.
- EP-A-0 114 252 it is known as a pretreatment for electrostatic painting of plastic parts to apply a conductive liquid, which is a solution polar Leading substances in rapidly volatile alcohols.
- each component Equipment By placing only an electrically or electrostatically chargeable on the surface of each component Equipment is applied that allows the oppositely charged Adhesion of powder coating before baking remains in the component its predetermined Get properties. Subsequent, complex and costly Checks whether the original properties or the desired properties of the non-conductive material or within a tolerance range, omitted, since only the surface is made conductive or chargeable with the aid of the equipment has been.
- the component can be like a Powder-coated component made of conductive material.
- the components are pre-wetted pre-dried to drive off volatile components that adversely affect the adhesion of the powder coating could be detrimental. This allows the quality of the later ones Improve painting.
- the predrying is individually tailored to the material and / or the formation of the components. So little time is wasted as possible.
- the components in a forced air oven, a dry air oven, pre-dried in a vacuum dryer, an infrared dryer or a microwave dryer are in a forced air oven, a dry air oven, pre-dried in a vacuum dryer, an infrared dryer or a microwave dryer.
- Fig. 1 is at least one made of electrically non-conductive material Component 1 in a first method step A in a basin 2 into a master solution 3, z. B. immersed in a salt bath. alternatively, it is possible to spray the components 1, Vaporization or similar application processes with the lead solution 3.
- a quaternary alkyl ammonium salt can be used, that is dissolved in a liquid.
- step B e.g. then the one with the lead solution 3 wetted component placed on a paint holder 4.
- the component 1 or the conductive solution 3 adhering to its surface electrically or electrostatically charged, e.g. positively charged.
- powder coating 5 e.g. with spray guns or spray nozzles 6, onto the surface of component 1 are applied. Due to the opposite charges from Conductive solution 3 or component 1 and powder coating 5, the powder coating 5 adheres to the surface of component 1.
- the powder coating 5 is covered with suitable means Treated to preferably 150 to 180 ° C for a predetermined period of time, to uniformly coat the surface of component 1 and subsequently cure. This can be for about 10 to 20 minutes and continuously or intermittently respectively.
- a pretreatment step A1 is a component 11 made of at least one electrically non-conductive material freed from volatile components that would otherwise occur during the paint hardening process could volatilize what the paint adhesion and / or surface quality would adversely affect.
- Pretreatment step A1 includes predrying, for example with a continuous or discontinuous process, e.g. in one Convection oven. Other devices can also be used for predrying, e.g. on Dry air oven, a vacuum dryer, an infrared dryer or a microwave dryer.
- Parameters to be taken into account during predrying are e.g. the salary more volatile Proportions or the wall thickness of the respective component.
- Predrying can take up to last for several hours at 180 ° C. The higher the temperature during predrying is, the faster the predrying takes place. The greater the wall thickness of the component is, the slower the predrying is. The less volatile parts in the material are available, the shorter the necessary pre-drying time. Little volatile For example, parts can already be injected in molded plastic components Obtain evacuation of the injection mold during the injection molding process become. Such a step in the injection molding process can be part of the pretreatment on.
- the predried component 11 is cooled, preferably to room temperature. Such cooling will later optimal quality properties of the paint achieved.
- the non-conductive material-related or non-conductive components 11, e.g. for a few seconds, in one with one Lead solution 13 filled basin 12 submerged.
- the control solution 13 contains the already mentioned salt dissolved in a liquid substance.
- the liquid substance can be water his. It is cheaper to use alcohol as a liquid substance because alcohol is evaporates more quickly during subsequent drying.
- the components 11 are then left to drain in method step A4 and, e.g. at room temperature, completely dried. To speed up the drying, it may be beneficial to use elevated temperatures. Preferably is dried for 2 to 15 minutes at approx. 25 to 70 ° C.
- drying can be simplified in process step A4 if the from the predrying components 11 that are still warm into the lead solution 13 (process step A3) are dipped. This is how the drying process in process step A4 the energy of the warm components is used for drying, and is only used after cooled down after wetting.
- powder coating 15 is applied as in Fig. 1, e.g. with spray devices 16, and cured in process step B2.
- Each component 11 is previously on the paint holder 4 with the desired charge, so that oppositely charged powder coating 15 adheres uniformly.
- the process can be used for all types of electrically non-conductive materials.
- This can e.g. reinforced and unreinforced polyamides, polyesters, polyurethanes, but also glass, ceramics, thermosets and wood.
- Restrictions on The types of materials for which the method can be used can result from the temperature resistance of the respective material in the case of the lacquer hardening required Temperatures of approx. 150 to 180 ° C result.
- the process can offer an even greater choice on paintable non-conductive materials such as plastic with lower melting or Include glass transition area.
- the lead solution or the conductive particles in the electrically non-conductive materials used or from these components not only stick to the surface, but at least slightly penetrate or diffuse into the surface. This has for the desired properties of the components have no significant negative impact.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
- Glanulating (AREA)
Description
- Fig. 1
- schematisch ein grundsätzliches Verfahren zum Pulverlackieren von Bauteilen aus elektrisch nichtleitenden Werkstoffen, und
- Fig. 2
- einen optimierten Gesamtverfahrensablauf in schematischer Darstellung.
Claims (6)
- Verfahren zum Pulverlackieren von Bauteilen (1,11) aus elektrisch nicht leitenden Werkstoffen, wobei auf die an sich nicht elektrisch leitenden Oberfläche des Bauteils eine elektrisch leitende Ausrüstung in Form einer benetzenden Leitlösung (3, 13) stoffschlüssig aufgebracht und zum Anhaften eines entgegengesetzt aufgeladenen Pulverlackes an die Oberfläche elektrisch oder elektrostatisch aufgeladen und der Bauteil mit dem anhaftenden Pulverlack zum Überziehen der Bauteiloberfläche und zum Aushärten des Pulverlackes einer Wärmebehandlung unterworfen wird, dadurch gekennzeichnet, dass die Bauteile (1, 11) vor dem Benetzen mit der Leitlösung (3, 13) durch Vortrocknen mit Wärmeenergie von die Pulverlack-Haftung und/oder die Pulverlack-Oberflächenqualität negativ beeinflussenden, leicht flüchtigen Werkstoff-Bestandteilen befreit werden.
- Verfahren im Anspruch 1, dadurch gekennzeichnet, dass die Vortrocknung während eines Vorbehandlungsschrittes (A1) unter Berücksichtigung bauteilspezifischer und/oder werkstoffspezifischer Parameter vorgenommen wird, vorzugsweise in Abhängigkeit von der Bauteil-Wandstärke und/oder dem Gehalt der leichtflüchtigen Werkstoff-Bestandteile.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Bauteile (1, 11) in einem Umluftofen, einem Trockenluftofen, einem Vakuumtrockner, einem Infrarottrockner oder einem Mikrowellentrockner vorgetrocknet werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Bauteile (1, 11) nach den Vortrocknen in etwa auf Raumtemperatur abgekühlt werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die vorgetrockneten Bauteile (1,11) in noch warmem Zustand mit der Leitlösung (3, 13) benetzt und dann getrocknet und/oder abgekühlt werden.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass bei zum Pulverlackieren hergestellten Spritzguss-Kunststoffbauteilen (1, 11) zur Verringerung flüchtiger Werkstoff-Bestandteile des Spritzguss-Werkzeugs während des Spritzgussprozesses evakuiert wird.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98110718A EP0963795B1 (de) | 1998-06-10 | 1998-06-10 | Verfahren zum Pulverlackieren von Bauteilen |
DE59804999T DE59804999D1 (de) | 1998-06-10 | 1998-06-10 | Verfahren zum Pulverlackieren von Bauteilen |
AT98110718T ATE221419T1 (de) | 1998-06-10 | 1998-06-10 | Verfahren zum pulverlackieren von bauteilen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98110718A EP0963795B1 (de) | 1998-06-10 | 1998-06-10 | Verfahren zum Pulverlackieren von Bauteilen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0963795A1 EP0963795A1 (de) | 1999-12-15 |
EP0963795B1 true EP0963795B1 (de) | 2002-07-31 |
Family
ID=8232108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98110718A Expired - Lifetime EP0963795B1 (de) | 1998-06-10 | 1998-06-10 | Verfahren zum Pulverlackieren von Bauteilen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0963795B1 (de) |
AT (1) | ATE221419T1 (de) |
DE (1) | DE59804999D1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005013230A1 (de) * | 2005-03-18 | 2006-09-28 | L. Schulte & Co. Gmbh | Verfahren zur elektrostatischen Pulverbeschichtung von hitzebeständigen Kunststoffteilen sowie Mittel zur Herstellung einer leitfähigen Schicht |
DE102005053327B4 (de) * | 2005-11-07 | 2008-08-21 | Eisenmann Anlagenbau Gmbh & Co. Kg | Vorrichtung und Verfahren zur Oberflächenbehandlung von Werkstücken |
AT504712A1 (de) | 2006-12-21 | 2008-07-15 | Steyr Daimler Puch Ag | Verfahren zur herstellung einer zusatzpanzerung |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL275608A (de) * | 1961-03-06 | |||
DE1519326A1 (de) * | 1964-02-17 | 1970-03-19 | Ransburg Electro Coating Corp | Mittel zur Oberflaechenbehandlung von isolierenden Materialien |
GB1198462A (en) * | 1966-09-27 | 1970-07-15 | Hommel Company O | Method of Electrostatic Application of Vitreous Frit Coatings to Glass and Other Ceramic Materials |
DD137196B1 (de) * | 1978-06-29 | 1980-12-24 | Wolfgang Kleber | Verfahren zur elektrostatischen beschichtung von werkstuecken aus isolierstoff |
DE3246574C2 (de) * | 1982-12-16 | 1985-10-10 | Fulgurit GmbH & Co KG, 3050 Wunstorf | Vorrichtung zur elektrostatischen Spritzlackierung |
US5219493A (en) * | 1991-06-12 | 1993-06-15 | Henkel Corporation | Composition and method for enhancing the surface conductivity of thermoplastic surfaces |
FR2713518B1 (fr) * | 1993-12-14 | 1996-01-26 | Applic Peintures Ste Indle | Procédé pour réaliser par voie électrostatique un revêtement en résine époxy sur des objets en matière plastique. |
DE4417172A1 (de) * | 1994-05-17 | 1995-11-23 | Worwag Lack Farbenfabrik Gmbh | Verfahren zur elektrostatischen Pulverbeschichtung nichtleitender Gegenstände |
-
1998
- 1998-06-10 AT AT98110718T patent/ATE221419T1/de not_active IP Right Cessation
- 1998-06-10 DE DE59804999T patent/DE59804999D1/de not_active Expired - Fee Related
- 1998-06-10 EP EP98110718A patent/EP0963795B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE221419T1 (de) | 2002-08-15 |
EP0963795A1 (de) | 1999-12-15 |
DE59804999D1 (de) | 2002-09-05 |
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