EP0930104A2 - Appareil et procédé pour réticuler et durcir une peinture - Google Patents

Appareil et procédé pour réticuler et durcir une peinture Download PDF

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Publication number
EP0930104A2
EP0930104A2 EP98123022A EP98123022A EP0930104A2 EP 0930104 A2 EP0930104 A2 EP 0930104A2 EP 98123022 A EP98123022 A EP 98123022A EP 98123022 A EP98123022 A EP 98123022A EP 0930104 A2 EP0930104 A2 EP 0930104A2
Authority
EP
European Patent Office
Prior art keywords
radiation
lacquer
substrate
photoinitiators
wavelength
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
Application number
EP98123022A
Other languages
German (de)
English (en)
Other versions
EP0930104B1 (fr
EP0930104A3 (fr
Inventor
Maximilian Zaher
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.)
Bush Industries Inc
Original Assignee
Bush Industries Inc
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
Application filed by Bush Industries Inc filed Critical Bush Industries Inc
Publication of EP0930104A2 publication Critical patent/EP0930104A2/fr
Publication of EP0930104A3 publication Critical patent/EP0930104A3/fr
Application granted granted Critical
Publication of EP0930104B1 publication Critical patent/EP0930104B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05D3/06—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 radiation
    • B05D3/061—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 radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating

Definitions

  • the invention relates to a method and an apparatus for Crosslinking and hardening paint on a substrate.
  • UV crosslinking (curing) of paints is state of the art.
  • broadband is used as a source of UV radiation UV lamps used, d. H. it will be a wide range of wavelengths on the substrate coated with lacquer directed.
  • So-called photoinitiators (PI) are added to the paint.
  • the photoinitiators absorb and cause UV radiation the networking.
  • Corresponding to the broadband UV radiation have been various photoinitiators in the prior art used in a varnish, so that over the entire wavelength range the radiation is sufficient Absorption occurs.
  • Photoinitiators are expensive. Become photoinitiators not activated when connected, there is a risk of yellowing for the paint.
  • Conventional UV lamps have a very high operating temperature on (e.g. more than 1000 ° C). These high operating temperatures of the UV lights make use of cooling air or other coolants required. This cooling is complex and cooling air also causes technical problems Dust, temperature gradients and air vortices.
  • the invention is based on the finding that use a monochromatic source of UV radiation has significant advantages brings with it.
  • monochromatic means here a relatively narrow wavelength range of UV radiation, such as that generated by an excimer laser that no special means for wavelength selection (either in the resonator or outside the resonator). The bandwidth an excimer laser is in this sense as to understand “monochromatic". In this sense, it becomes monochromatic If the UV radiation source is used, the varnish needs advantageously only a very specific type of photoinitiator to contain, which is fully implemented during curing, so that no "unused" photoinitiators remain that the bring yellowing risk mentioned above.
  • thermosensitive layer It is similar in a method described in DE 41 23 915 A1 is introduced, monochromatic UV light used to the Possibility of damage to an underlying layer of paint greatly reduce thermosensitive layer.
  • the invention is based on further knowledge, that the benefits of using a monochromatic source for UV radiation are enhanced by the fact that essential parameters, that play a role in hardening, on each other be coordinated.
  • the method according to the invention and the device according to the invention for crosslinking (hardening) of lacquer are therefore by a in this sense essentially monochromatic UV radiation source characterized, in particular by the use of an excimer laser, and the wavelength of UV radiation, the absorption characteristics of the photoinitiators in the varnish and the power density of the radiation are thus interrelated matched that the UV radiation over the entire desired Thickness of the lacquer layer to be hardened is absorbed.
  • the wavelength of the UV radiation in the range from 190 to 250 nm, in particular at about 248 nm.
  • the invention enables homogeneous crosslinking and hardening of lacquer layers with thicknesses of 50 ⁇ m and more.
  • a laser as a UV radiation source, in particular an excimer laser, has the further advantage that when State of the art technical problems still to be noted regarding the dimensional stability of the substrate (coated object) are largely overcome.
  • the curing with laser radiation enables targeted local absorption, without the underlying substrate (object) being strong is heated.
  • excimer lasers bends, microscopic cracks in the substrate, moisture leakage and other phenomena affecting the quality of the paint layer and in particular their adhesion to the substrate avoided.
  • the distance between the radiation source (the laser) and the substrate is not critical to that Networking result, so that when controlling a relative movement between laser radiation and object not on the distance needs to be respected.
  • Curing with laser radiation also enables very good results for objects with sharp edges.
  • the networking takes place also on the edges with no significant difference to Networking on the surfaces.
  • Figure 1 shows a side view of the optical system and Figure 2 is a plan view.
  • a substrate (object) 10 is to be provided with a lacquer layer become.
  • the substrate 10 is in the illustrated embodiment made of a wooden material. On the other hand, it can For example, substrate made of a plastic, metal or consist of a composite material.
  • the lacquer layer 12 has a thickness of 50 ⁇ m.
  • An excimer laser 14 (type EMG. Serves as a source of UV radiation 50 from LAMDA PHYSIK) with KrF gas.
  • the laser 14 emits a wavelength of about 248 nm.
  • Special facilities for Reduction of the bandwidth of the emitted radiation 16 points the laser 14 is not on (for example, no grating in the resorator).
  • the excimer laser 14 is operated in a pulsed manner.
  • the repetition rate the pulses and the energy of the individual pulses can be set.
  • Crosslinked with UV radiation - and curable coatings are made on Market with different absorption characteristics. Lacquers are available that absorb very strongly at 248 nm and paints that absorb less strongly at 248 nm, so z. B. have an absorption maximum at 270 nm. There were tested different paints and it was shown that it is not absolutely necessary, even advantageous is to use a varnish that has its absorption maximum not exactly at 248 nm, i.e. the wavelength used Has UV radiation source.
  • Figures 1 and 2 show the optical system for steering the Radiation of the excimer laser 14 onto that with the lacquer layer 12 provided substrate 10.
  • a stage 20 is vertical according to Figure 1 Movable up and down.
  • the laser beam passes through a prism 18 16 to another prism 22 and into a double prism 24.
  • the arrangement causes the laser beam 16 to be divided in three beam parts, each via lenses 26a, 26b and 26c ( Figure 2) get on the paint layer 12.
  • a beam component is passed straight through from the double prism 24 and over the Lens 26b shown, a beam portion is from the double prism 24th deflected upwards onto a mirror 28, from where it passes over the Lens 26a reaches the lacquer layer 12 and a third Beam portion is directed by the double prism 24 onto a mirror 30, from where the beam portion through the lens 26c onto the lacquer layer 12 is directed.
  • Figures 3 and 4 show a further embodiment for optical devices for directing the UV laser radiation.
  • Figures are mutually corresponding or functionally similar Provide components with the same reference numerals.
  • FIG. 3 shows a side view of the optical system
  • FIG. 4 shows a top view (from above).
  • the stage 20 ' can be moved vertically up and down in accordance with the arrow P 2 .
  • the plate 34 is rotatable about an axis A in accordance with the arrow P 1 (with respect to the stage 20 '). By rotating the plate 34 about the axis A, the laser radiation directed via the lens 26 onto the lacquer layer and the substrate 10 is pivoted in accordance with the arrow P 3 .
  • This arrangement also enables homogeneous curing of the lacquer layer 12 on the substrate 10.
  • a cross-cut test showed a very good cross-cut characteristic in the range between Gt1 and Gt2.
  • An abrasion test with steel wool showed a high mechanical resistance the paint layer.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
EP98123022A 1997-12-09 1998-12-07 Appareil et procédé pour réticuler et durcir une peinture Expired - Lifetime EP0930104B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19754633A DE19754633A1 (de) 1997-12-09 1997-12-09 Verfahren und Vorrichtung zum Vernetzen und Härten von Lack
DE19754633 1997-12-09

Publications (3)

Publication Number Publication Date
EP0930104A2 true EP0930104A2 (fr) 1999-07-21
EP0930104A3 EP0930104A3 (fr) 2002-10-02
EP0930104B1 EP0930104B1 (fr) 2005-04-06

Family

ID=7851267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98123022A Expired - Lifetime EP0930104B1 (fr) 1997-12-09 1998-12-07 Appareil et procédé pour réticuler et durcir une peinture

Country Status (3)

Country Link
EP (1) EP0930104B1 (fr)
DE (2) DE19754633A1 (fr)
ES (1) ES2239378T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10106543A1 (de) 2001-02-13 2002-08-22 Basf Ag Beschichtungsmittelzusammensetzungen
CN111594404A (zh) * 2020-05-14 2020-08-28 青岛科技大学 一种稀薄气体中的石墨烯激光推进方法
FR3164462A1 (fr) * 2024-07-12 2026-01-16 Hmrexpert Procédé de polymérisation

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3737455A1 (de) * 1986-11-06 1988-05-19 Westinghouse Electric Corp Einrichtung und verfahren zum erzeugen von farbmustern
DE4002682A1 (de) * 1990-01-31 1991-08-01 Herberts Gmbh Verfahren zum beschichten von substraten mit durch uv-strahlung haertbaren ueberzugsmitteln
DE4123915A1 (de) * 1990-07-19 1992-01-23 Herberts Gmbh Verfahren zum schutz von thermisch empfindlichen aufzeichnungsmaterialien gegen aeussere einfluesse unter verwendung von radikalisch polymerisierbaren ueberzugsmitteln
DE4439350C3 (de) * 1994-10-11 2000-06-15 Alkor Gmbh Verfahren zur Herstellung eines mit UV-härtbarem Lack beschichteten flächenförmigen Trägermaterials
DE59604303D1 (de) * 1995-04-27 2000-03-02 Metronic Geraetebau Verfahren und vorrichtung zum härten von uv-druckfarben

Also Published As

Publication number Publication date
EP0930104B1 (fr) 2005-04-06
ES2239378T3 (es) 2005-09-16
EP0930104A3 (fr) 2002-10-02
DE19754633A1 (de) 1999-06-10
DE59812712D1 (de) 2005-05-12

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