EP0923995A2 - Verfahren zum Härten von Lackschichten mit verschiedenen Bestrahlungen - Google Patents
Verfahren zum Härten von Lackschichten mit verschiedenen Bestrahlungen Download PDFInfo
- Publication number
- EP0923995A2 EP0923995A2 EP98123020A EP98123020A EP0923995A2 EP 0923995 A2 EP0923995 A2 EP 0923995A2 EP 98123020 A EP98123020 A EP 98123020A EP 98123020 A EP98123020 A EP 98123020A EP 0923995 A2 EP0923995 A2 EP 0923995A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiation
- paint
- layers
- lacquer
- substrate
- 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.)
- Ceased
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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
- B05D3/068—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 ionising radiations (gamma, X, electrons)
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- 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
- 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
-
- 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 for hardening and increasing the scratch resistance of at least one by means of UV and / or Electron beam hardened paint layer on a substrate.
- Radiation-curable systems which are in particular radiation-curable paints, coatings and printing inks, are generally known in the art. Usually acts it is caused by radiation (especially UV radiation or electron radiation) curable acrylic acid esters (such as polyurethane, polyester, polyether and epoxy acrylates). These acrylic acid esters are commonly called acrylate oligomers designated.
- acrylate oligomers are applied to solid materials, around this with as abrasion-resistant as possible to provide a scratch-resistant coating.
- abrasion resistance of acrylate oligomer coatings by adding certain so-called To improve toughening plasticizers, cf. e.g. DE 42 13 999 A1.
- These toughening agents are said to increase abrasion resistance radiation-hardened coatings.
- EP 0 365 844 A2 describes a radiation-crosslinkable Lacquer based on furan acrylic acid ester Epoxy resins.
- Radiation-curable systems are also known in the prior art based on the so-called unsaturated polyester or based cationically curing binders, such as epoxy compounds, cycloaliphatic epoxy compounds, vinyl ethers or esters.
- Powdery hard fillers make the abrasion resistance significantly improved, especially as powdery fillers Quartz, silicon dioxide, basalt, glass powder etc. in question come (see. DE 34 04 491 A1).
- the invention is based on the technical problem of a radiation-hardened lacquer layer containing at least one acrylate oligomer contains, with simple means, the hardness and the To improve the scratch resistance of the surface of the lacquer layer.
- a radiation-hardened lacquer layer containing at least one acrylate oligomer contains, with simple means, the hardness and the To improve the scratch resistance of the surface of the lacquer layer.
- this goal is achieved in that after Radiation hardening using the lacquer layer or several lacquer layers Infrared radiation is or will be irradiated and the power and the exposure time of the laser radiation can be controlled that in the surface layer of the paint temperatures in the range from 160 ° C to 220 ° C.
- the Temperature increase brought about by IR radiation essentially limited to layer depths in the lacquer from 20 ⁇ m to 250 ⁇ m becomes.
- the invention is based in particular on the knowledge that the above-mentioned objectives can be achieved with good product quality in particular if the IR radiation has essentially wavelengths greater than 10 ⁇ m. Particularly good results are achieved if IR laser radiation is used, in particular the IR radiation of the CO 2 laser with a wavelength of 10.6 ⁇ m.
- the layers of paint are applied to a substrate.
- a substrate come into consideration in particular, woods or wood-based materials, especially furniture, furniture fronts, worktops, floors, Wall panels, doors or stairs.
- Substrate plastics are used, in particular plates or foils for floors, furniture, furniture fronts, signs, Covers, profiles, car body parts etc.
- a laser in particular a CO 2 laser
- the inventive method also causes two or more Lacquer layers applied on top of each other on a substrate are stuck together better. Also the adhesion of the paint on the substrate can be improved with the method according to the invention become.
- the paint-coated and radiation-hardened Workpieces then post-treated with infrared radiation subjected, resulting in an improved Scratch resistance of the surface results.
- the IR post-treatment in particular without applying a color decor.
- the aftertreatment according to the invention with IR radiation is highest effective because the electron beam hardening is a very good deep hardening of the lacquer layer (s), i.e. high abrasion resistance, while subsequent IR radiation improved Scratch resistance of the surface of the lacquer layer (s) Consequence.
- the figure schematically shows a substrate 10 and one thereon applied first lacquer layer 12 and one applied over it second lacquer layer 14.
- the laser radiation emitted by a CO 2 laser with wavelengths at approximately 10.6 ⁇ m is indicated schematically in the figure by reference number 16.
- the laser radiation can be applied over a large area and / or in a focused manner to the lacquer layers, depending on the power setting and timing of the radiation.
- the laser radiation enables favorable control with regard to Radiation intensity and exposure time such that only the desired layers of the paint are heated to maximum values, the substrate 10 largely from the temperature increase can remain undisturbed, so that the disadvantages mentioned above can be avoided.
- There were z. B. heat build-up and the like what the Guiding the air over the layers of paint to a critical technical problem. It has also been shown that an exact Setting the IR radiation with regard to its wavelength and adaptation to the absorption in the lacquer has the consequence that for the curing of the paint, little effective parts of the Radiation remain without unwanted influence.
- Open pore paint are around 20 grid points on a so-called linear centimeter. Textured systems have about 40 to 60 halftone dots have about the linear centimeter and closed systems 120 halftone dots on the linear centimeter.
- the preferred layer thickness was in which the IR heating was essentially effective, 20 up to 30 ⁇ m. The corresponding was for textured systems Layer thickness 30 to 70 microns and with closed-pore system was the preferred layer thickness is approximately 80 to 150 ⁇ m. This means, that essentially the maximum only at these layer depths Temperature increase should be effective.
- An acrylic resin-based varnish is preferably used with 5% up to 10% ethylene wax and 3 to 7% by weight silicate.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims (7)
- Verfahren zum Härten und zum Erhöhen der Kratzfestigkeit von zumindest einer mittels UV- und/oder Elektronenstrahl gehärteten Lackschicht (12, 14) auf einem Substrat (10), die zumindest ein Acrylat-Oligomer enthält,
wobei nach der UV- und/oder Elektronenstrahlhärtung die Lackschicht (12, 14) mit IR-Strahlung (16) bestrahlt wird und die Leistung und die Einwirkungszeit der Laserstrahlung so gesteuert werden, daß in der Oberflächenschicht des Lackes Temperaturen im Bereich von 160°C bis 220°C erreicht werden. - Verfahren nach Anspruch 1, dadurch gekennzeichnet,
daß die IR-Strahlung (16) im wesentlichen Wellenlängen größer als 10 µm aufweist. - Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet,
daß IR-Laserstrahlung verwendet wird. - Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet,
daß zur Erzeugung der IR-Strahlung ein CO2 Laser verwendet wird. - Verfahren nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet,
daß die durch IR-Bestrahlung bewirkte maximale Temperaturerhöhung im wesentlichen auf Schichttiefen im Lack von 20 µm bis 250 µm beschränkt wird. - Verfahren nach einem der vorhergehenden Ansprüche, wobei zwei oder mehr Lackschichten (12, 14) auf das Substrat (10) aufgetragen sind und die Haftung zwischen den Lackschichten durch die IR-Strahlung (16) verbessert wird.
- Verfahren nach einem der vorhergehenden Ansprüche, wobei zwei oder mehr Lackschichten (12, 14) auf das Substrat (10) aufgetragen sind und die Haftung zwischen den Lackschichten durch die IR-Strahlung (16) verbessert wird.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1997154621 DE19754621C2 (de) | 1997-12-09 | 1997-12-09 | Verfahren zum Härten und zum Erhöhen der Kratzfestigkeit von strahlgehärteten Lackschichten |
| DE19754621 | 1997-12-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0923995A2 true EP0923995A2 (de) | 1999-06-23 |
| EP0923995A3 EP0923995A3 (de) | 2000-03-08 |
Family
ID=7851258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98123020A Ceased EP0923995A3 (de) | 1997-12-09 | 1998-12-07 | Verfahren zum Härten von Lackschichten mit verschiedenen Bestrahlungen |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0923995A3 (de) |
| DE (1) | DE19754621C2 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001021365A1 (de) * | 1999-09-22 | 2001-03-29 | Kronospan Technical Company Ltd. | Vorrichtung sowie verfahren zur herstellung von fussbodenpaneelen |
| US6761961B1 (en) | 1999-09-22 | 2004-07-13 | Kronospan Technical Company Limited | Device and method for producing floor panels |
| WO2006125723A1 (de) * | 2005-05-27 | 2006-11-30 | Basf Coatings Ag | Verfahren zur herstellung kratzfester gehärteter materialien |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10309669A1 (de) * | 2003-03-06 | 2004-09-16 | Volkswagen Ag | Verfahren zur Trocknung wenigstens einer Lackschicht auf einem Substrat |
| DE102004044534B4 (de) * | 2004-07-01 | 2006-05-11 | Daimlerchrysler Ag | Verfahren zur Aushärtung von Lacken |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935330A (en) * | 1971-12-08 | 1976-01-27 | Union Carbide Corporation | Two-step coating process |
| US4393187A (en) * | 1982-06-23 | 1983-07-12 | Congoleum Corporation | Stain resistant, abrasion resistant polyurethane coating composition, substrate coated therewith and production thereof |
| DE3641301A1 (de) * | 1986-12-03 | 1988-06-16 | Licentia Gmbh | Verfahren zur kunststoffbeschichtung einer oberflaeche |
| DE4122743C1 (de) * | 1991-07-10 | 1992-11-26 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De |
-
1997
- 1997-12-09 DE DE1997154621 patent/DE19754621C2/de not_active Expired - Fee Related
-
1998
- 1998-12-07 EP EP98123020A patent/EP0923995A3/de not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001021365A1 (de) * | 1999-09-22 | 2001-03-29 | Kronospan Technical Company Ltd. | Vorrichtung sowie verfahren zur herstellung von fussbodenpaneelen |
| US6761961B1 (en) | 1999-09-22 | 2004-07-13 | Kronospan Technical Company Limited | Device and method for producing floor panels |
| WO2006125723A1 (de) * | 2005-05-27 | 2006-11-30 | Basf Coatings Ag | Verfahren zur herstellung kratzfester gehärteter materialien |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19754621C2 (de) | 2002-03-21 |
| DE19754621A1 (de) | 1999-06-10 |
| EP0923995A3 (de) | 2000-03-08 |
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