EP1062053B1 - Verfahren zur pulverlackierung - Google Patents
Verfahren zur pulverlackierung Download PDFInfo
- Publication number
- EP1062053B1 EP1062053B1 EP99911798A EP99911798A EP1062053B1 EP 1062053 B1 EP1062053 B1 EP 1062053B1 EP 99911798 A EP99911798 A EP 99911798A EP 99911798 A EP99911798 A EP 99911798A EP 1062053 B1 EP1062053 B1 EP 1062053B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- substrate
- radiation
- temperature
- hardened
- 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.)
- Revoked
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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
- 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
-
- 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
Definitions
- the invention relates to a method for powder coating a substrate, especially a temperature sensitive one Substrates such as wood, wood fiber material, plastic, rubber, Fabric, paper or cardboard according to the preamble of claim 1.
- the invention further relates to the use of a halogen lamp for powder painting.
- a method of this type is, for example, from W0-A-92 / 0.1517 or from GB-A-2 056 885.
- thermoreactive powder at which the necessary curing temperature over multi-stage Energy transfers is achieved.
- First is infrared (IR) radiation or convective the surface of the powder coating heated.
- the warming takes place in the powder layer via heat conduction processes up to Substrate interface.
- Only at approximately complete warming of the substrate reaches the boundary layer the necessary cross-linking temperature.
- this well-known Process provides for heating the coating only the temperature gradient between the coating surface and substrate is the driving process variable. Um homogeneous networking and perfect adhesion on the To ensure substrate, heating times are several minutes necessary.
- the crosslinking and curing temperatures are often below Powder coatings between 120 ° C and 300 ° C. Because of this high Temperatures can be temperature sensitive substrates after the known methods not powder-coated or only with restrictions become.
- thermoreactive powder on a substrate a primer before applying the thermoreactive powder is applied to the surface of the substrate.
- the primer consists, for example, of water-based paint.
- the Priming is particularly useful for substrates made of wood or Wood fiber materials, inhomogeneities on the surface to compensate for the substrate, a moisture barrier form and allow adhesion of thermoreactive powder.
- the powder can then be irradiated with electromagnetic radiation, especially with medium wave Infrared radiation can be networked and cured.
- the primer also forms a heat conduction barrier that prevents heat transfer during the crosslinking reaction in the powder layer on the substrate with special needs. Especially with temperature sensitive substrates was able to apply a powder coating at all be made possible.
- this is known method limited to the use of thermoreactive powders, their cross-linking temperature is only slightly higher than the damage temperature of the substrate.
- a primer layer does not help here as it does not form a permanently effective heat conduction barrier and there the evaporation temperatures are usually much lower than the crosslinking and curing temperatures of the thermoreactive Are powder.
- a primer made of water-based paint only until the Be primed until the primer is a Powder coating layer can be applied.
- GB-A-2 056 885 describes a process for powder coating of substrates made of wood, cellulose, paper, cardboard or similar known in which a thermoreactive powder on the applied uncoated surface of the substrate and by means of infrared radiation, preferably in the wavelength range between 1 ⁇ m and 5 ⁇ m, is cured.
- the in the Irradiation times specified in the publication are in the range between 20 s and 2 min.
- WO 92/01517 A describes a method for coating a heat-sensitive material described with powder coating, which a two-stage procedure for infrared treatment of the applied paint. In a first, short step becomes a physical one at high temperature State change, while in a second, much longer step at reduced temperature Paint is cured.
- the invention has for its object a method for Powder coating of a substrate, especially a temperature sensitive one Substrates such as wood, wood fiber material, Plastic, rubber, fabric, paper or cardboard to indicate that a powder coating of the uncoated surface of the substrate allowed without damaging it, and that to one uniform, completely cross-linked and well adhering lacquer layer leads.
- a temperature sensitive one Substrates such as wood, wood fiber material, Plastic, rubber, fabric, paper or cardboard to indicate that a powder coating of the uncoated surface of the substrate allowed without damaging it, and that to one uniform, completely cross-linked and well adhering lacquer layer leads.
- the task is accomplished through a process with the characteristics of Claim 1 and by the use of a halogen lamp for Fuherlackier according to one of claims 1 to 9 according to solved the claim 10.
- An essential idea in the method according to the invention for powder coating is that for crosslinking necessary and targeted energy throughout the entire Powder layer thickness in the as the base layer on the uncoated Amount of powder applied to the surface of the substrate is introduced.
- the gelation or crosslinking energy is at least in the form of radiation energy Base layer introduced and absorbed there.
- the one used Radiation has at least radiation components in the near and / or short-wave infrared.
- NIR radiation near infrared radiation
- the Powder layer and the substrate surface through near infrared radiation (NIR radiation) homogeneous and in a matter of seconds the required gelling or crosslinking temperature is heated. Under near infrared, the wavelength range becomes more electromagnetic Radiation between the visible range and about 2 ⁇ m Understood wavelength.
- the infrared radiation makes the thermoreactive Powder either warmed to cross-linking temperature and cured, or warmed to gel temperature and only crosslinked in a later process step and cured.
- gelling results a composite of the powder material without a complete Crosslinking or curing to form a layer of lacquer.
- the powdery base layer and 99fs. line second layer no longer than 12 s, in particular irradiated for no longer than 8 s until hardening. After applying a second layer, however due to radiation penetrating into the base layer Irradiation of the base layer continued, so that the total irradiation time the base layer is longer than 12 or 8 s can.
- the targeted, preferably homogeneous across the thickness of the base layer distributed introduction of energy using infrared radiation, especially NIR radiation, speeds up the process the connection or crosslinking of the powder particles considerably compared to the known method in which the energy input due to the depth of the base layer essentially of heat conduction takes place.
- This is also an excellent one Controllability of the connection or networking process given, especially because of a control of the Radiation flux density, the spectral distribution of radiation energy and / or the duration of radiation exactly the desired Process progress can be controlled. Is cheap it if the aforementioned process parameters depend on the absorption properties of the thermoreactive powder, on the reflective properties the substrate surface and the thermal conductivity of the substrate can be adjusted.
- the rapid continuous heating of the Base layer ensures good adhesion to the substrate surface.
- the cured or pre-gelled Base layer a second layer of a thermoreactive powder is applied and the whole is not yet fully cross-linked Coated by means of infrared radiation and cured.
- the base layer has hardened or gelled Gel temperature or curing temperature cooled, preferably by compressed air that flows towards the surface this flows along.
- the second layer immediately after curing or Pre-gelling applied.
- the second layer With its application and curing the painting process is terminated, in particular uniform paint surface are generated, the highest quality requirements equivalent.
- the second layer compensated for irregularities in the base layer, which, for example, ensures a consistently uniform can achieve glossy or matt lacquer surface.
- the Difference to known powder coatings with UV powder coatings can be used with both the first and the second also achieve matt powder coating surfaces.
- Powder coating made of different materials can exist, especially when using similar Powder for the base layer and the second layer a particularly homogeneous and across the depth of the overall finish form a uniformly crosslinked lacquer layer.
- Advantages of this Powder coating systems are therefore particularly included robustness, abrasion resistance and chemical resistance the paint job.
- the two-layer variant of the method according to the invention can especially substrates such as wood and wood fiber Materials (in short: wood fiber materials) with high coating quality be powder coated.
- substrates such as wood and wood fiber Materials (in short: wood fiber materials) with high coating quality be powder coated.
- wood fiber Materials in short: wood fiber materials
- the targeted control of networking and Curing process can be prevented that moisture bubbles Generate irregularities in the paint layer.
- an adhesive layer is formed, which may still has an irregular surface or even from individual, not connected island-like Paint stains exist.
- After curing or pre-gelling the The base layer then has a lot for the second layer better starting conditions. Liability is improved and it is therefore usually when the powder is applied second layer applied more material.
- the coating material runs to a uniform Paint layer.
- controllability of the process progress is to be further increased if the process is further developed the surface temperature of the thermoreactive powder a pyrometer is measured and controlled by the radiation flux density regulated the infrared radiation.
- defined temporal temperature profiles of the powder coating run be, e.g. B. with steep temperature rise and subsequent Phase of constant temperature over time Crosslinking process just above the minimum crosslinking temperature continue until fully cured.
- sources of radiation generate very high electromagnetic radiation Radiation flux densities, which in particular allow the crosslinking temperature can be reached within a few seconds.
- Preferably are incandescent in the halogen lamp, in particular Heating coils, used with low mass, so that the radiation flux density is responsive controllable.
- the surface temperature of the filament can be set up to 3500 K. preferred dimensions line-like halogen lamps in combination with channel-like ellipsoidal or parabolic reflectors used.
- the uncoated surface of the substrate especially made of plastic, a pretreatment for Improve conductivity for an electrostatic Application of the thermoreactive powder subjected. In particular Design is done on the surface of the substrate an electrically conductive liquid is applied.
- thermoreactive powder melts immediately and is continued if necessary Radiation cross-linked.
- the substrate shown in Fig. 1 consists of a medium density Fiberboard (MDF) 1 with a base layer of thermoreactive Powder and also from a second layer was coated from thermoreactive powder. This was the MDF 1 grounded on the side not to be coated and it the thermoreactive powder of first lacquer layer 2 on the uncoated surface of the MDF 1 applied. Then the base layer was coated with Infrared radiation from a radiation source whose Radiation flux density maximum is about 1 ⁇ m wavelength, Irradiated for 5 s until the temperature of the powder rises Setting temperature has increased. This, about the thickness of the first Lacquer layer 2 approximately homogeneous temperature was maintained for approximately 1 s. The irradiation process was then stopped.
- MDF medium density Fiberboard
- the substrate was only on during the gelling process its surface and only slightly warmed, so that in the MDF 1 bound water did not leak on the surface is and the uniformity of the paint coating is not was disturbed.
- the MDF 1 was on the uncoated Grounded side and it was thermoreactive via the tribo process Powder for the second lacquer layer 3 on the surface the first lacquer layer 2 applied. Then were for about 6 s the first 2 and the second 3 layers of paint with the Infrared radiation at a radiation flux density maximum with irradiated at a wavelength of about 1 ⁇ m until the crosslinking temperature was reached. Through continued radiation with lower radiation flux density over about 3 s was the crosslinking reaction until complete curing both layers of paint continued. After that, the radiation canceled and waited a few seconds until the layers of paint cooled significantly below the crosslinking temperature had. Also through the second irradiation process No vapor or gas bubbles are formed, leading to an irregularity of the paint coating could have resulted.
- MDF (not shown) was also used Surface contours immediately after pre-drying coated by NIR radiation. Here too even with single-layer powder coatings achieved with uniform thickness and smooth surface.
- the hollow cylinder 5 consists for example of acrylonitrile-butadiene-styrene (ABS), made of polypropylene (PP) or polyetylene (PE).
- ABS acrylonitrile-butadiene-styrene
- PP polypropylene
- PE polyetylene
- MDF polyester resin powder, Epoxy or an epoxy / polyester powder used.
- the halogen tube emitters 7 and a reflector 8 combined with them can be seen.
- the reflector geometry is one over the length of the hollow cylinder 5 ensures uniform radiation.
- the hollow cylinder 5 has a lacquer layer 6 made of thermoreactive Powder on.
- the surface of the hollow cylinder 5 is first sprayed with isopropanol.
- the isopropanol layer was then grounded and applied the thermoreactive powder.
- the hollow cylinder 5 with a rotation frequency of about one revolution in six seconds was rotated.
- the Hollow cylinder five with a higher rotation frequency, in particular with a rotation frequency of five revolutions per Second rotates.
- the radiation was on after about six Seconds canceled.
- the paint layer 6 was complete cross-linked and cured. Applying a second Paint layer on the hollow cylinder 5 was not necessary because even the first coat of paint is an even and homogeneous one Appearance.
- the halogen tube emitters 7 in Fig. 2 have a filament 10 low mass in a quartz glass tube 11.
- the two Ends of the filament 10 are each flowing through Compressed air cooled to the life of the halogen tube lamp 7 increase.
- the reflector 8 is by means of Compressed air or liquid cooled to constant conditions for the reflection of the halogen tube spotlights 7 to create emitted radiation.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Paints Or Removers (AREA)
Abstract
Description
- Fig. 1
- eine mitteldichte Faserplatte (MDF) mit zwei Pulverlackschichten und
- Fig. 2
- eine Anordnung zur Vernetzung von Pulverlack auf in sich geschlossen umlaufenden Oberflächen eines Kunststoffsubstrats.
- 1
- MDF
- 2
- erste Lackschicht
- 3
- zweite Lackschicht
- 5
- Hohlzylinder
- 6
- Lackschicht
- 7
- Halogen-Röhrenstrahler
- 8
- Reflektor
- 9
- Rotationsachse
- 10
- Glühwendel
- 11
- Quarzglasröhre
Claims (10)
- Verfahren zur Pulverlackierung eines Substrats (1, 5), insbesondere eines temperaturempfindlichen Substrats (1, 5) wie Holz, Holzfaserwerkstoff, Kunststoff, Gummi, Stoff, Papier oder Karton, wobei ein thermoreaktives Pulver als Grundschicht (2, 6) auf die unbeschichtete Oberfläche des Substrats (1, 5) aufgebracht wird und das Pulver mittels Infrarotstrahlung, zumindest mit Strahlungsanteilen im nahen Infrarot, durchgehend auf Vernetzungstemperatur erwärmt und hiermit zum Aushärten gebracht oder durchgehend auf Geliertemperatur erwärmt wird und erst in einem späteren Verfahrensschritt fertig vernetzt und ausgehärtet wird, dadurch gekennzeichnet, daß die Pulverschicht (2, 6 3) nicht länger als insgesamt 12 Sekunden, insbesondere nicht länger als 8 sekunden, bis zum fertigen Aushärten bestrahlt wird.
- Verfahren nach Anspruch 1,
wobei auf die ausgehärtete oder vorgelierte Grundschicht (2) eine zweite Schicht (3) thermoreaktives Pulver aufgebracht wird und die gesamte noch nicht fertig vernetzte Beschichtung mittels der Infrarotstrahlung vernetzt und ausgehärtet wird. - Verfahren nach Anspruch 2,
wobei nach dem Aushärten oder Gelieren der Grundschicht (2) diese unter Aushärtetemperatur bzw. Geliertemperatur abgekühlt wird. - Verfahren nach einem der Ansprüche 1 bis 3,
wobei die Oberflächentemperatur des thermoreaktiven Pulvers mittels eines Pyrometers gemessen und durch Steuerung der Strahlungsflußdichte der Infrarotstrahlung geregelt wird. - Verfahren nach einem der Ansprüche 1 bis 4,
wobei zur Erzeugung der Infrarotstrahlung zumindest eine Hochleistungs-Halogenlampe (7) mit einer Strahlertemperatur von mehr als 2500 K eingesetzt wird. - Verfahren nach einem der Ansprüche 1 bis 5,
wobei die unbeschichtete Oberfläche des Substrats (5) einer Vorbehandlung zur Verbesserung der Haftfähigkeit für das thermoreaktive Pulver unterzogen wird, insbesondere durch Aufbringen einer elektrisch leitenden Flüssigkeit. - Verfahren nach einem der Ansprüche 1 bis 6,
zur Pulverlackierung eines Feuchtigkeit enthaltenden oder aufnehmenden Substrats (1), wobei durch Trocknen und/oder Befeuchten des Substrats vor dem Aufbringen der Grundschicht ein definierter Feuchtegehalt erzeugt wird. - Verfahren nach Anspruch 7,
wobei zum Trocknen des Feuchtigkeit enthaltenden Substrats (1) die Substratoberfläche mit gleichem oder höherem als für die Vernetzung notwendigen Energieeintrag bestrahlt wird. - Verfahren nach Anspruch 8,
wobei die Substratoberfläche durch die Bestrahlung auf eine Temperatur erwärmt wird, die über der Schmelztemperatur des thermoreaktiven Pulvers liegt, so daß zumindest ein Teil des thermoreaktiven Pulvers nach dem Aufbringen auf die Substratoberfläche sofort schmilzt. - Verwendung einer Halogenlampe (7) zur Pulverlackierung nach einem der Ansprüche 1 bis 9,
wobei die Halogenlampe (7) mit einem Reflektor (8) zur Reflexion der emittierten Strahlung in Richtung des Substrats (1, 5) kombiniert ist und
derart betrieben wird, daß das Strahlungsflußdichte-Maximum der emittierten Strahlung im nahen Infrarot liegt.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19811319 | 1998-03-16 | ||
DE19811319 | 1998-03-16 | ||
DE1998131781 DE19831781A1 (de) | 1998-07-15 | 1998-07-15 | Verfahren zur Pulverlackierung |
DE19831781 | 1998-07-15 | ||
PCT/EP1999/001720 WO1999047276A1 (de) | 1998-03-16 | 1999-03-16 | Verfahren zur pulverlackierung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1062053A1 EP1062053A1 (de) | 2000-12-27 |
EP1062053B1 true EP1062053B1 (de) | 2002-08-14 |
Family
ID=26044646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99911798A Revoked EP1062053B1 (de) | 1998-03-16 | 1999-03-16 | Verfahren zur pulverlackierung |
Country Status (11)
Country | Link |
---|---|
US (1) | US6436485B1 (de) |
EP (1) | EP1062053B1 (de) |
JP (1) | JP2002506725A (de) |
KR (1) | KR100685477B1 (de) |
CN (1) | CN1203924C (de) |
AU (1) | AU3035299A (de) |
BR (1) | BR9908843A (de) |
CA (1) | CA2324097A1 (de) |
DE (1) | DE59902341D1 (de) |
ES (1) | ES2182500T3 (de) |
WO (1) | WO1999047276A1 (de) |
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WO2004031671A1 (de) | 2002-09-26 | 2004-04-15 | Advanced Photonics Technologies Ag | Verfahren und anordnung zur thermischen behandlung eines werkstücks |
DE102007015261A1 (de) | 2007-03-27 | 2008-10-02 | Aacure Aadhesives Gmbh | Reaktivmasse und Verfahren zur Aufbringung hierfür |
US7442409B2 (en) | 2001-04-18 | 2008-10-28 | Rohm And Haas Company | Differential processing of powder coated substrates |
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JPH0777894A (ja) * | 1993-08-11 | 1995-03-20 | Kiyotsukou Seiko Kk | 電子写真方式印刷装置における熱放射定着部の退避方法 |
JPH0792831A (ja) * | 1993-08-11 | 1995-04-07 | Kiyotsukou Seiko Kk | ハロゲンランプにおける赤外線照射方法 |
AU1263695A (en) * | 1993-12-13 | 1995-07-03 | Electrostatic Technology, Inc. | Powder coating method for producing a composite web |
DE19533858B4 (de) * | 1995-09-13 | 2005-09-22 | IHD Institut für Holztechnologie Dresden gGmbH | Verfahren zum elektrostatischen Beschichten von Holz und Holzwerkstoffen |
JPH09201517A (ja) * | 1996-01-30 | 1997-08-05 | Inax Corp | 膜ユニット |
-
1999
- 1999-03-16 JP JP2000536498A patent/JP2002506725A/ja not_active Withdrawn
- 1999-03-16 US US09/646,324 patent/US6436485B1/en not_active Expired - Fee Related
- 1999-03-16 CN CNB998040533A patent/CN1203924C/zh not_active Expired - Fee Related
- 1999-03-16 ES ES99911798T patent/ES2182500T3/es not_active Expired - Lifetime
- 1999-03-16 EP EP99911798A patent/EP1062053B1/de not_active Revoked
- 1999-03-16 DE DE59902341T patent/DE59902341D1/de not_active Expired - Fee Related
- 1999-03-16 WO PCT/EP1999/001720 patent/WO1999047276A1/de active IP Right Grant
- 1999-03-16 CA CA002324097A patent/CA2324097A1/en not_active Abandoned
- 1999-03-16 BR BR9908843-6A patent/BR9908843A/pt not_active Application Discontinuation
- 1999-03-16 KR KR1020007010216A patent/KR100685477B1/ko not_active IP Right Cessation
- 1999-03-16 AU AU30352/99A patent/AU3035299A/en not_active Abandoned
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7442409B2 (en) | 2001-04-18 | 2008-10-28 | Rohm And Haas Company | Differential processing of powder coated substrates |
WO2004031671A1 (de) | 2002-09-26 | 2004-04-15 | Advanced Photonics Technologies Ag | Verfahren und anordnung zur thermischen behandlung eines werkstücks |
DE20221980U1 (de) | 2002-09-26 | 2009-12-17 | Advanced Photonics Technologies Ag | Anordnung zur thermischen Behandlung eines Werkstücks |
DE102007015261A1 (de) | 2007-03-27 | 2008-10-02 | Aacure Aadhesives Gmbh | Reaktivmasse und Verfahren zur Aufbringung hierfür |
Also Published As
Publication number | Publication date |
---|---|
JP2002506725A (ja) | 2002-03-05 |
AU3035299A (en) | 1999-10-11 |
CN1293598A (zh) | 2001-05-02 |
KR100685477B1 (ko) | 2007-02-23 |
KR20010041912A (ko) | 2001-05-25 |
CN1203924C (zh) | 2005-06-01 |
CA2324097A1 (en) | 1999-09-23 |
US6436485B1 (en) | 2002-08-20 |
ES2182500T3 (es) | 2003-03-01 |
BR9908843A (pt) | 2000-11-21 |
DE59902341D1 (de) | 2002-09-19 |
EP1062053A1 (de) | 2000-12-27 |
WO1999047276A1 (de) | 1999-09-23 |
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