WO1996022843A1 - Verfahren zum pulverbeschichten oder beschichten mit ofentrocknenden lacken von werkstücken aus temperatursensiblen werkstoffen - Google Patents
Verfahren zum pulverbeschichten oder beschichten mit ofentrocknenden lacken von werkstücken aus temperatursensiblen werkstoffen Download PDFInfo
- Publication number
- WO1996022843A1 WO1996022843A1 PCT/AT1996/000003 AT9600003W WO9622843A1 WO 1996022843 A1 WO1996022843 A1 WO 1996022843A1 AT 9600003 W AT9600003 W AT 9600003W WO 9622843 A1 WO9622843 A1 WO 9622843A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- workpiece
- coating
- pigments
- powder
- Prior art date
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
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
-
- 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
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
Definitions
- the invention relates to a method for powder coating or coating with oven-drying lacquers (Duomerers) of workpieces made of temperature-sensitive materials, in particular wood, wood fiber boards and plastics.
- Temperature-sensitive materials are to be understood as those materials which are not resistant to higher temperatures above 40 ° C., such as occur, for example, when baking or crosslinking lacquers, and are deformed, damaged or decomposed in the process.
- Oven-drying lacquers (duromers) are understood to be those lacquers which only dry at higher temperatures of approx.> 80 ° C with the volatilization of the solvent and simultaneous crosslinking reaction.
- the object of the invention is to provide a method which makes it possible to coat workpieces consisting of temperature-sensitive materials with a powder coating or coating with oven-drying lacquers (duromers) without the workpiece being any Suffered damage.
- the invention now consists in the fact that the workpiece first with a temperature-insulating protective coating which has a temperature resistance up to at least 300 ° C and a thermal conductivity, that the protective coating during heating on the side facing away from the workpiece from 80 ° to 300 "C during a period between 5 up to 45 min on the side facing the workpiece has a temperature of at most 70 ° C, and that after that a powder coating or coating with oven-drying lacquers (duromers) is applied to the previously protective-coated workpiece and the thus surface-coated workpiece then a Vernetzungstempe ⁇ temperature between 80 ° C and 300 C for a period of 5 is subjected to 45 min.
- a temperature-insulating protective coating which has a temperature resistance up to at least 300 ° C and a thermal conductivity
- the method according to the invention brings great advantages particularly for the furniture, panel and door industries, but also for the plastics processing industry.
- materials, in particular wood fiber boards, particle boards, materials made from wood waste, less valuable woods and various other items are found here to a large extent
- Plastic material which, however, due to its low resistance to higher temperatures, could not previously be powder-coated or could not be coated with oven-rocking lacquers, is used for the production of workpieces.
- oven-drying lacquers for the surface coating of workpieces made of such temperature-sensitive materials. Even if the method according to the invention comprises a two-stage coating process, this method can nevertheless be carried out in a very simple and inexpensive manner.
- a certain qualitative and / or quantitative composition of the protective coating is not so much responsible for a successful and satisfactory implementation of the method according to the invention, but above all the fact that the protective coating as a whole has such a reduced thermal conductivity and the workpiece is sufficiently resistant to the effects of higher ones Temperatures, such as those that occur when the powder coating is baked on, as well as the coating due to oven-drying lacquers in the oven, protect the workpiece or the material forming it from being undamaged and undeformed.
- the definition of the temperature-insulating protective layer which has been carried out gives the person skilled in the art clear instructions for a selection of the coatings which are possible here, and moreover their desired other properties, expediency from the material of the workpiece, can be taken into account. It is particularly important for the method according to the invention that the protective coating satisfies the definition given. Corresponding ⁇ values for the protective coating as a whole can be calculated from the definition, the individual parameters of which can easily be determined and understood objectively.
- the process according to the invention is further characterized in that a preferably water-thinnable, pigment-containing primer is applied as the temperature-insulating protective coating.
- the primer is a plastic dispersion which may contain fillers and / or additives and which contains one or more pigments as the main temperature-insulating component.
- the plastic dispersion is preferably a water-based paint, in particular an acrylic-polyurethane dispersion, although other commercially available polymeric paint binders can also be used.
- customary fillers such as, for example, alkaline earth carbonates and sulfates, silica gels, diatomaceous earth, talc, etc., and additives, e.g. Wetting agents can be added.
- Pigments are also added to the primer, with, in addition to pigments primarily responsible for the temperature-insulating property of the primer, also electrically conductive pigments, such as, for example, graphite, carbon black or the like, commercially available pigments.
- electrically conductive pigments such as, for example, graphite, carbon black or the like, commercially available pigments.
- transition metal oxide pigments preferably zirconium oxide pigments or mixed metal oxide pigments, or inorganic and / or organic new materials or materials produced by nanotechnology or sol-gel technology, for example ceramic pigments, ormocers
- these are primarily u composites on a molecular and nanoscale level that can be obtained with the new material syntheses.
- Ormoceras (Organically Modified Ceramics) are specifically a group of new materials, in which ceramic and plastic are combined on the basis of sol-gel technology. Molecular networks of ceramics and organic plastics have grown together in the Ormocera.
- the substrate Derived from the exact knowledge of the substrate to be provided with a primer as a protective coating, it is advantageous to ensure that the substrate is optimally wetted and that the surface is given an electrical conductivity.
- the foundation should allow ventilation of the substrate until filming, but then show a blocking effect.
- An electrical conductivity of the protective coating or of the primer forming it is advantageous above all for a problem-free and in any case flawless overpainting with a powder coating or with an oven-drying lacquer.
- the protective coating which can be applied to the workpiece according to a further feature of the method according to the invention can also be produced from a ceramic material or from inorganic and / or organic new materials or materials, e.g. from nanotechnology or sol-gel technology. Ormocera.
- the protective coating is now formed from, it is in any case advantageous that the surface tensions both the protective coating and the powder coating or the oven-drying lacquer (duromer) are similar in order to ensure good intermediate adhesion.
- the technology according to the method according to the invention not only has the advantages already mentioned above, according to which workpieces consisting of temperature-sensitive materials can be powder-coated or coated with oven-drying lacquers (duromers), but it is also one Environmentally friendly technology, especially when low-emission water-based paints are used as protective coatings and emission-free powder coatings.
- a primer used as a protective coating preferably an aqueous, pigment-containing plastic dispersion
- the workpiece coated with an oven-drying lacquer (Duro er) is, according to the invention, subjected to a stoving or crosslinking temperature between 80 and 240 ", in particular 80 to 180" C, preferably for a period of 5 to 30 minutes.
- the powder coating can be carried out by known methods, the electrostatic powder coating being an advantageous method when carrying out the process according to the invention.
- thermosetting powder coatings for example made of epoxy, polyester and acrylic resins, are suitable;
- thermoplastics of PA, EVA copolymers, PE, polyesters and poly-epoxides are also used in a known manner.
- the use of plastic powders in aqueous or solvent dispersions is also entirely possible.
- primers as a protective coating
- solvent release is the step determining the final properties, while in aqueous dispersions this is less the evaporation process than the polymer particle fusion depending on the pigment Volume concentration (PVK) and the ratio of the grain size of the pigments to the diameter of the polymer particles is. Since all individual forces are in inversely proportional relation to the particle diameter, film-forming forces are particularly high when the dispersed particles are particularly small. With a particle size of 0.05 to 0.1 ⁇ m, pressures of several hundred bar are calculated.
- the spatial structure of the filler particles is influential for the desired blocking effect; these can be platelet and / or spherical.
- the grain distribution of the fillers on the water and water vapor diffusion is likewise of some influence, the characteristic of the grain distribution curve also having an effect on the properties of the film density. It is also advantageous that the platelet-shaped fillers, in combination with other fillers, are at least partially arranged parallel to the substrate.
- Example 1 Workpiece: wood (medium density fibreboard (MDF board)) Protective coating: Aqualack * primer Drying: 20 min flash-off time, then drying 20 min at 80 ° C; then the surface is sanded. Top coat: epoxy powder coating; They are baked in at 120 ° C. for 20 minutes. Aqualack is understood to mean a plastic dispersion which forms a water-based paint and contains pigments, which can contain, for example, the following ingredients, the% being% by weight:
- wetting agents wetting agents, additives, various binders, water repellents.
- This pigment has temperature insulating properties and is infrared reflecting and electrically conductive.
- the Aqualack primer can be applied to the workpiece using a casting machine or spray gun, especially when applying the primer
- Drying 20 min flash-off time, then drying 20 min at 80 ° C; then the surface is sanded.
- Top coat epoxy powder coating; The same is baked in at 200 "C. for 15 minutes.
- Example 3 Workpiece, protective coating and drying as in Example 2.
- Topcoat alkyd-melamine resin topcoat, customary oven-drying lacquer based on solvents; stoving data: 20 min flash-off time, then 20 min at 130 ° C.
- Example 4 workpiece, protective coating and drying as example 2.
- Top coat water-thinnable alkyd-melamine resin top coat;
- Burn-in data 20 min flash-off time, then 20 min at 130 ° C.
- Example 5 Workpiece: acrylonitrile butadiene styrene (ABS) Pretreatment: degreasing with alcohol or the like.
- Top coat epoxy powder coating; The same is baked in at 130 "C. for 20 minutes.
- Example 6 Workpiece: phenolic resin
- Aqualack I is preferably used for the protective coating of workpieces made of wood and Aqualack II for workpieces made of plastics, whereby however, the use of Aqualack I or II will have to be determined by the expert depending on the expediency.
- the coated workpieces in no case show any type of deformation or damage, which is due to the application of the protective coating corresponding to the process conditions according to the invention directly on the workpiece before the top coating is applied and baked.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU43792/96A AU4379296A (en) | 1995-01-23 | 1996-01-17 | Process for powder-coating or stove-enamelling workpieces of temperature-sensitive materials |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT10595A AT402265B (de) | 1995-01-23 | 1995-01-23 | Verfahren zum pulverbeschichten oder beschichten mit ofentrocknenden lacken von werkstücken aus temperatursensiblen werkstoffen |
ATA105/95 | 1995-01-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996022843A1 true WO1996022843A1 (de) | 1996-08-01 |
Family
ID=3481652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT1996/000003 WO1996022843A1 (de) | 1995-01-23 | 1996-01-17 | Verfahren zum pulverbeschichten oder beschichten mit ofentrocknenden lacken von werkstücken aus temperatursensiblen werkstoffen |
Country Status (3)
Country | Link |
---|---|
AT (1) | AT402265B (de) |
AU (1) | AU4379296A (de) |
WO (1) | WO1996022843A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1092479A1 (de) * | 1999-10-15 | 2001-04-18 | Rohm And Haas Company | Mehrlagige Beschichtung von hitzeempfindlichen Gegenständen |
FR2880579A1 (fr) * | 2005-01-12 | 2006-07-14 | Vulliod Jean De | Procede de marquage de materiaux en bois et substance utilisee |
DE102008049941B3 (de) * | 2008-10-02 | 2010-04-29 | Fritz Egger Gmbh & Co. | Paneel, insbesondere Fußbodenpaneel |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU427793B2 (en) * | 1970-11-12 | 1972-09-01 | Improvements in the coating of surfaces | |
US4190686A (en) * | 1978-08-04 | 1980-02-26 | Muis Louis H | Protective composition and method |
WO1994012289A1 (en) * | 1992-11-20 | 1994-06-09 | Dancor, Inc. | Process for protecting a surface using silicate compounds |
-
1995
- 1995-01-23 AT AT10595A patent/AT402265B/de not_active IP Right Cessation
-
1996
- 1996-01-17 AU AU43792/96A patent/AU4379296A/en not_active Abandoned
- 1996-01-17 WO PCT/AT1996/000003 patent/WO1996022843A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU427793B2 (en) * | 1970-11-12 | 1972-09-01 | Improvements in the coating of surfaces | |
US4190686A (en) * | 1978-08-04 | 1980-02-26 | Muis Louis H | Protective composition and method |
WO1994012289A1 (en) * | 1992-11-20 | 1994-06-09 | Dancor, Inc. | Process for protecting a surface using silicate compounds |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1092479A1 (de) * | 1999-10-15 | 2001-04-18 | Rohm And Haas Company | Mehrlagige Beschichtung von hitzeempfindlichen Gegenständen |
FR2880579A1 (fr) * | 2005-01-12 | 2006-07-14 | Vulliod Jean De | Procede de marquage de materiaux en bois et substance utilisee |
DE102008049941B3 (de) * | 2008-10-02 | 2010-04-29 | Fritz Egger Gmbh & Co. | Paneel, insbesondere Fußbodenpaneel |
Also Published As
Publication number | Publication date |
---|---|
ATA10595A (de) | 1996-08-15 |
AU4379296A (en) | 1996-08-14 |
AT402265B (de) | 1997-03-25 |
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