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EP3350265A1 - Peinture en poudre et procédé de fabrication d'une peinture en poudre - Google Patents

Peinture en poudre et procédé de fabrication d'une peinture en poudre

Info

Publication number
EP3350265A1
EP3350265A1 EP16767245.0A EP16767245A EP3350265A1 EP 3350265 A1 EP3350265 A1 EP 3350265A1 EP 16767245 A EP16767245 A EP 16767245A EP 3350265 A1 EP3350265 A1 EP 3350265A1
Authority
EP
European Patent Office
Prior art keywords
powder coating
effect
pigments
pigment
powder
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.)
Pending
Application number
EP16767245.0A
Other languages
German (de)
English (en)
Inventor
Christian Lutz
Carsten HERZHOFF
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.)
Tiger Coatings GmbH and Co KG
Original Assignee
Tiger Coatings GmbH and Co KG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=54150318&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP3350265(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Tiger Coatings GmbH and Co KG filed Critical Tiger Coatings GmbH and Co KG
Publication of EP3350265A1 publication Critical patent/EP3350265A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C09D5/032—Powdery paints characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/0015—Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/62—Metallic pigments or fillers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/62—Metallic pigments or fillers
    • C09C1/64—Aluminium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C09D5/031—Powdery paints characterised by particle size or shape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C09D5/033—Powdery paints characterised by the additives
    • C09D5/035—Coloring agents, e.g. pigments
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/36—Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0041—Optical brightening agents, organic pigments
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/10—Encapsulated ingredients
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/62—Metallic pigments or fillers
    • C09C1/64—Aluminium
    • C09C1/644—Aluminium treated with organic compounds, e.g. polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/62—Metallic pigments or fillers
    • C09C1/64—Aluminium
    • C09C1/644—Aluminium treated with organic compounds, e.g. polymers
    • C09C1/646—Aluminium treated with organic compounds, e.g. polymers concomitant with mechanical comminution, shaping or abrasion of the particles

Definitions

  • the present invention relates to a powder coating comprising at least one base powder coating B and at least one effect powder coating A with effect pigments, the production of such effect powder coating by an effect pigment-sparing dispersion of effect pigments in a melt of transparent powder coating by, for example, gentle extrusion and an effect powder coating as they are by the invention Powder coating can be provided.
  • metallic powder paints or also effect powder paints, in particular RAL 9006, RAL 9007, DB paints or metallic micaceous paints, are produced today in the so-called bonding or dry blending process.
  • Powder coating in powder form is weighed in the right proportions with effect pigments and additives and homogenized in a subsequent mixing process.
  • the powder coating used here is in particular effect powder coating based on resin / polyester, primer, polyester / epoxy, pure epoxy or polyurethane resins.
  • the effectors used are in particular pigments based on aluminum flakes, natural or artificial mica or on the basis of glass. Depending on the requirements, these pigments are coated one or more times, making them weather and / or chemical resistant.
  • the mixing process can be carried out as a simple mixing operation in a mixer with a low circumferential speed and a short residence time, wherein binder, additives, etc. and the metal pigments are dry mixed together.
  • the disadvantage here is that such dry mixtures lead, inter alia, due to the different specific weights and electrostatic charging behavior during powder coating to demixing of metal pigment and binder.
  • the recyclability of such a powder coating with metal pigments is therefore no longer present in powder coatings produced by this process.
  • Alternatively, in the so-called bonding process by heating a mixture of powder coating and metal pigment up to the glass transition temperature of the powder coating, a physical connection of the metal pigment particles to the powder coating particles can be achieved. In the bonding process, therefore, the metal pigments are attached to the surface of the powder coating particles by introducing energy, for example by external heat sources or high shear forces, and resulting heating of the powder coating to the glass transition point or higher.
  • Another production process in particular of so-called hammer impact effects for indoor use, is carried out by mixing powder coating raw materials, in particular resins, hardeners, pigments, additives and fillers, with dust-free or dedusted aluminum effect pigments, subsequent extrusion, cold rolling, breaking and grinding to form a powder coating ,
  • This method is generally used only for hammer blow effect and coarse structures, the required chemical resistance, even against climatic influences such. in facades or highly weather-resistant systems, one-layer can not be guaranteed. Therefore, such effects are used only in decorative indoor use.
  • a mixture of the raw materials for a colorless powder coating is first weighed.
  • a light-shielding powder coating with coarse and fine aluminum pigment is prepared, all mixed and extruded together for 5-10 minutes.
  • the pigment is already in the premix and goes through the entire extrusion process.
  • the extrudate is then rolled flat and cooled, crushed and ground.
  • CN103756525A describes the production of thermosetting powder coatings.
  • the raw materials consisting of polyester resins, hardeners, additives and mica (mica) pigment are mixed in a high-speed stainless steel mixer and then extruded in a twin-screw extruder. Subsequently, the product thus obtained is cold-rolled, crushed and ground. Again, the pigment is already weighed in the premix and fed to the extrusion process at the beginning.
  • EP 2 896 661 A1 relates to a powder coating in particulate and cured form with effect pigments and to a process for the production of powder coating with effect pigments.
  • a film-forming homogeneous thermoplastic lacquer composition from the starting materials, in particular comprising binders, additives, colorants and / or fillers produced, which lacquer mass is ground after leaving the extruder, wherein the effect pigments added in an end region of the extruder and in the viscous paint mass are dispersed.
  • the effect pigments are thereby wetted and coated with the film-forming coating composition, the surface of the effect pigments being at least 50%, in particular at least 75%, preferably at least 90% of the coating composition are wetted.
  • the composition of the finished powder coating is identical to the composition used to coat the effect pigments.
  • DE 102007006820 A1 relates to metallic effect pigments which have a homogeneous synthetic resin layer, the synthetic resin coating comprising polyacrylate and / or polymethacrylate and organofunctional silane.
  • the synthetic resin layer is applied by polymerization in situ as a layer on the metallic effect pigments.
  • WO 2005/063897 A2 discloses chemically and mechanically stable metallic effect pigments which are coated with oligomeric and / or polymeric binders which are crosslinkable chemically and / or under the action of, for example, UV or IR radiation.
  • the metallic effect pigments can thus be embedded in a polymeric film.
  • the binders are still curable or polymerizable after the coating of the metal pigments, which is why the metal pigments are used in powder coating. While coating or evaporating the solvent, the binders may readily polymerize, but they do not cure.
  • the metal pigment can also be coated with the same binder system into which it is later - for example, in a powder coating - also incorporated and processed.
  • the metallic effect pigments are prepared by dispersing the metal pigments in a solution or dispersion of an oligomeric and / or polymeric binder in an organic solvent and then spraying, or spraying a solution or dispersion of an oligomeric and / or polymeric binder in an organic solvent to fluidize in a gas stream Metallic pigments, as well as drying the binder-coated metal pigments in a moving gas stream.
  • Powder coating effects for eg the facades or window coating should be distinguished by a striking effect (so-called sparkling effect), which is particularly strong in dark basic shades. Due to the high contrast between brighter, brilliant effect pigments and the dark base color, the smallest differences in the effect concentration, especially on the finished object, are very easy to recognize, especially if several coated components are directly integrated with each other and aligned in bursts. In the case of larger components, unwanted clouds or banding have been observed (occasionally increased pigment concentration). In addition, coatings on different coating systems or with different system settings and part geometries lead in part to different coating results and color tone / effect formation. These hue variations are not desired by contractors or architects and are complained about, even if this is only a visual defect and has no influence on the protective effect of the powder coating.
  • the proportion of recovery powder in effect powder coating plays a major role.
  • the powder which does not precipitate on the object, is sucked off and passed on to a cyclone.
  • the fine fraction is separated from the rest by rotation and gravity and sucked off. The remainder is collected via a dosing system and / or supplied in defined amounts to the fresh powder and thus the coating process again.
  • effect powder coatings that have been produced by the dryblend process, there is a risk that the fine metallic effect pigments will be separated and extracted via this cyclone. This is characterized by the so-called effect drift, which makes the color of the effect powder over time less and less metallic. As a result, the proportion of recovery powder is severely limited.
  • Object of the present invention is the production of unique and brilliant effect powder coatings whose appearance or effect form is not or only slightly influenced by gun type, equipment setting, proportion of recovery powder and part geometry. These absolutely reliable and pronounced metallic effects have a special depth effect and are suitable for use in highly weather-resistant systems. The effects are absolutely comparable to those of wet paints. Furthermore, the present invention relates to such a powder coating comprising effect pigments prepared according to the invention in a ground premix.
  • Distinctive metallic effects characterized in particular by a high depth effect, a brilliant effect and in particular by an independence from the viewing angle of the effects.
  • substrates coated with the metallic powder coatings according to the invention show significantly lower surface area Color variations. These properties could not be realized in prior metallic powder coatings made according to the prior art.
  • a powder coating comprising at least one base powder coating B and at least one effect powder coating A with effect pigments, wherein the effect pigments in effect powder coating A are at least partially enveloped by a transparent powder coating matrix.
  • the effect pigments can be dispersed in a melt of transparent and mostly colorless effect powder coating.
  • a powder coating composition is used, which is mainly composed only of resins / hardeners and necessary additives (eg for film degassing).
  • the cured powder coating film shows a high transparency (light transmission).
  • a transparent powder coating is preferably used which still has sufficient transparency at layer thicknesses of a cured film of 15 ⁇ m in order to detect the underlying coating layers or substrates.
  • the samples were measured by the byk "BYKmac” from the byk company, meaning the si (sparkle intensity) and the sa (sparkle area) value, which is determined in three different measurement angles and a coating which was produced with the powder coating according to the invention, which shows a significant difference with a similar effect pattern, as can be seen in Table 1.
  • the measured values show that the sparkle intensity, measured on coatings produced with the powder coating according to the invention, is very high in all three measurement angles. The difference between the measurement angles is small (at most approximately 30% less than the highest value). With bonded powder paint, the sparkle intensity is only high at one angle, and significantly lower at the other two angles. The lowest value is up to 90% less than the highest measured value on the same sheet, at a different measuring angle.
  • FIGS. 1 through 9 also show this effect optically. It was to the painted with bonded effect paint (sheet on the left photo) and coated with the powder coating sheet according to the invention (sheet on the photo right) plane-parallel next to each other and photographed at different angles in a light booth.
  • Photomicrographs of transverse sections of coating layers produced with the powder coating according to the invention substantiate the above-mentioned theory of channel formation by a transparent powder coating matrix.
  • an effect powder coating is provided in which the channel formed by the transparent matrix between effect pigments and the surface of the coating has a depth of at least 5 ⁇ m, preferably at least 10 ⁇ m, and very particularly preferably has at least 20 ⁇ .
  • FIGS. 10 to 13 illustrates a comparison of FIGS. 10 to 13 with FIGS. 14 to 16 in the case of coatings according to the prior art (FIGS.
  • FIGS. 10 to 16 are photographs of such transverse cuts shown.
  • the darker areas, without any visible particles (such as fillers or color pigments) consist of the mentioned transparent powder coating matrix. These channels extend up to 60 ⁇ into the powder coating layer, and also make pigments visible (the effect pigments appear as bright surfaces in these images due to the illumination), which are embedded far into the paint.
  • the shearing forces which occur on the effect pigment in effect powder coating A during production are so low that the majority of the effect pigments do not undergo any substantial reduction in the particle size.
  • This can be technically achieved, for example, by melting transparent powder paint, for example in a heated stirred reactor, and stirring at least one effect pigment into the melt, the effect powder coating A obtained from this powder coating melt having been cooled by grinding, then with an opaque, preferably colored Base powder coating B is mixed.
  • Other technical embodiments are conceivable within the scope of the invention.
  • a preferred embodiment is that at least one effect pigment is added by at least one Sidefeeder during an extrusion process of a transparent powder coating melt, wherein the obtained from this powder coating melt after cooling by grinding effect powder coating A is then mixed with a base powder coating B.
  • the term "sidefeeder” implies the addition of a substance (usually according to the prior art an additive or effect pigment, see for example information material of the extruder manufacturer Leistritz Extrusionstechnik GmbH (Germany) "Master_V_07_GB / 17.09.13 masterbatch)) at another position in the extruder Process part as directly at the beginning of the extruder (premix intake in barrel 1) .
  • the sidefeeder forcibly conveys the effect pigment laterally into the extruder and introduces it into the melt in a certain ratio to the transparent powder coating premix the screw configuration used can influence the shearing force acting on the pigment in the extruder
  • a low shearing force within the extruder is characterized by little destruction of the effect pigment, by using only mixing or conveying the
  • an addition in the rear part preferably has in the last third of the process part (eg in the penultimate housing) of the extruder via Sidefeeder proved to be particularly advantageous.
  • special screw configurations for example the use of conveying elements alone, keep the shearing force as low as possible so that the pigment (s) are only destroyed or damaged to a small extent.
  • a transparent effect powder coating A can be prepared by adding at least one effect pigment through at least one sidefeeder to the melt of a subsequently transparent hardening powder coating during an extrusion process and grinding the cooled melt, the effect powder coating A then containing at least one further Powder paint B, the so-called base powder coating is mixed. Also possible is the joint grinding of extrudate chips from the effect powder coating A according to the invention with extrudate chips of another powder coating B in a common milling process.
  • the base powder coating B can be a single-colored powder coating which contains no effect pigments or an effective powder coating which has been produced by dryblend, bonding or extrusion.
  • the effect powder coating A can be prepared in an extruder by adding effect pigment to a transparent powder coating melt via a sidefeeder.
  • the sidefeeder itself is located in the last third of the procedure section. After the addition point of the sidefeeder, only small shearing forces are introduced via the extruder shaft.
  • the effect powder coating is cold rolled, crushed and ground after extrusion.
  • the powder coating of the invention can then be prepared by preparing and weighing the raw materials, including the transparent effect powder coating A and the base powder coating B, followed by premixing, extrusion or mixing, cold rolling, breaking and grinding.
  • the powder coating of the invention can also be additionally refined with effect pigment in a further process step, which is possible in particular by a bonding method.
  • the powder coating of the invention comprises effect powder coating A mixed with base powder coating B in a mass ratio of 1-50% effect powder coating A with 50-99% base powder coating B, particularly preferably 5-30% effect powder coating A with 70-95% base powder coating B.
  • the powder coating of the invention can be produced by so-called dry-coating or by bonding. The mixing of effect powder coating A with base powder coating B in the melt phase is possible within the scope of the invention.
  • the powder coatings according to the invention when used for producing a coating, behave approximately like unicolored powder coatings. Phenomena, such as clouds or banding, do not occur with large components. The typical brightening of the edges at different profiles and sizes, caused by an accumulation of effect pigments on the edge, can not be seen. This is a noticeable improvement over the prior art effect powder coatings.
  • Specific substrates for coating with the powder coatings according to the invention are in particular pretreated and / or cleaned / degreased aluminum alloys or steel and its alloys.
  • the powder coatings according to the invention are characterized in that the pigment or pigments has been introduced into the melt phase without significant destruction of the pigments due to shear forces.
  • typical powder coating system will be described at this point. Further information can be found for example in Powder Coatings - Chemistry and Technology, 3rd edition, Emmanouil Spyrou. Powder Coatings:
  • binders for the powder coatings of the invention include saturated and unsaturated systems.
  • the latter can be crosslinked inter alia radically by UV and / or thermal initiators such as peroxides.
  • the former are currently the dominant quantity in use.
  • Saturated polyesters are the most important of these binders.
  • carboxyl-functional polyester resins which have a functionality of 2 or higher are mentioned at this point. These can be crosslinked with organic compounds that are capable of reacting with the carboxyl groups of the polyester to form a covalent bond and, if appropriate, mixed with customary pigments, fillers and additives
  • PrimidR XL-552 bis [N, N'-di ( ⁇ -hydroxyethyl)] adipamide
  • Primid® QM-1260 bis [N, N'-di ( ⁇ -hydroxypropyl)] adipamide
  • TGIC as a curing agent for carboxyl-functional polyester resins
  • glycidyl esters of aromatic or cycloaliphatic dicarboxylic acids a corresponding commercially available hardener of analogous chemical structure is, for.
  • AralditR PT 910 terephthalic acid diglycidyl ester / trimellitic (tr) acid triglycidylester, about 75:25) of CIBA Spezialitatenchemie GmbH.
  • the presence of trifunctional trimellitic (h) acid ester in Araldit® PT 910 is considered to be beneficial for the crosslink density of baked coatings as compared to pure diglycidyl esters.
  • Polyester resins for producing weather-stable powder coatings which are cured with polyepoxides and / or ⁇ -hydroxyalkylamides, generally have an acid number in the range from 15 to 70 mg KOH / g polyester and a hydroxyl number less than or equal to 10 mg KOH / g polyester.
  • aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid
  • aliphatic dicarboxylic acids such as adipic and / or cyclohexanedicarboxylic
  • aliphatic diols preferably branched, like neopentyl glycol, in addition to lower levels of linear and / or cycloaliphatic diols.
  • lactones lactones
  • modification of such resins by the use of di- and trimeric fatty acids.
  • lower proportions of tri or higher functional and possibly monofunctional compounds may find application.
  • the powder paint of the present invention mainly uses two kinds of pigment, namely, aluminum pigments and mica / mica pigments. Also can be used brass and copper pigments.
  • Effect pigments are divided into metallic effect pigments and special effect pigments.
  • metallic effect pigments flakes of metal, in particular of aluminum, are used.
  • the metallic surface reflects the light, which the viewer perceives as a metallic effect.
  • Important metallic effect pigments are aluminum, brass and copper platelets.
  • Pearlescent pigments and interference pigments are grouped under the term special effect pigments.
  • Pearlescent pigments are effect pigments consisting of transparent platelets with a high refractive index. They produce a pearl-like effect through multiple reflection.
  • Interference pigments are effect pigments whose coloring effect is based entirely or predominantly on interference. Interference pigments may be based on transparent or non-transparent platelets.
  • Metal oxide-coated mica pigments which may be pearlescent or interference pigments depending on the nature and thickness of the coating, are the industry's most widely used.
  • the most important interference pigments are platelet-shaped titanium dioxide, flaky organic pigments, metal oxide mica pigments, aluminum oxide flakes, Ca-Al-borosilicate flakes, silicon dioxide flakes, metal oxide-coated metal flakes or multilayer pigment. Many of these pigments are then further coated with metal oxides (e.g., titanium dioxide). Depending on the oxide layer thickness, this can influence the color effect. Common names for this are Iriodin®, Miraval® or Colorstream
  • Pigments based on natural mica are typically made from naturally occurring muscovite mica by milling, fractionating, purifying and post coating, drying and calcination.
  • the effect of the pigments is based on the principle of directional reflection in metallic effect pigments and directed reflection and interference in pearlescent pigments.
  • the average diameter of the dispersed effect pigments is at least 90% of the average diameter of the original effect pigments.
  • the diameter of the effect pigments (usually in the form of pigment platelets), depending on the type, is usually about 3 to 100 ⁇ m, the thickness of the individual platelets is less than 1 ⁇ m.
  • the platelets can consist of one or more layers.
  • the support material is crystalline (for example mica) or amorphous (glass or silicon dioxide platelets). To achieve a good effect image, the particles must have the smoothest possible surface and align themselves in the respective application.
  • a further division of the metallic effect pigments is carried out in leafing or non-leafing pigments.
  • Leafing pigments are based on special surface treatments in the hardened paint film on the surface. This creates a strong metallic shine. However, this effect is not scratch or smudge-resistant, which usually requires an overcoating with a protective clearcoat film.
  • Non-leafing pigments spread evenly throughout the film matrix after application. Only part of the pigment orients itself to the surface. This protects them against abrasion and attack by chemicals. The effect is less brilliant and metallic than leafing pigments.
  • Fig. 1 Effect color approx. RAL 9007 shiny approx. 0 ° inclined
  • Fig. 5 matt gray metallic inclined at about 45 °
  • Fig. 7 dark gray metallic approx. 0 ° inclined
  • Fig. 8 dark gray metallic approx. 45 ° inclined
  • Fig. 9 dark gray metallic approx. 75 ° inclined
  • FIG. 10 transverse section of a lacquer layer produced with the powder coating according to the invention.
  • the pigments (light sticks) lie in a channel of transparent, translucent powder coating, so the opaque, colored powder coating is recognizable.
  • To the right of the lacquer layer is the substrate (bright aluminum sheet) on the left the dark embedding material of the compact
  • Fig. 1 1 the channel of transparent lacquer extends about 60 ⁇ deep into the lacquer layer, the pigment therein is therefore visible when the surface is considered
  • Fig. 12 Pigment is about 10 ⁇ below the surface, embedded in transparent powder coating and thus visible
  • Fig. 13 Pigment is embedded in the transparent lacquer up to 25 ⁇ m. All around, the opaque, colored paint can be seen
  • Fig. 14 Cross section of a sample prepared with powder coating in which the pigment was extruded into a colored, opaque lacquer. The pigments are embedded deep in the paint matrix and are NOT visible
  • Fig. 15 Cross-section of a sample made with powder coating in which the pigment was mixed into a colored, opaque lacquer by bonding. The pigments are embedded deep in the paint matrix and are NOT visible
  • Fig. 16 Cross section of a sample prepared with powder coating in which the pigment was mixed in a colored, opaque lacquer by bonding. A part of the pigment lies on the surface and is visible (effect-giving) the remainder lies in the Lackmatix and is therefore not visible
  • Fig. 18 Pigment bonded, 200X magnification; Pigment slightly destroyed. (Shearing forces in the bonding mixer)
  • Fig. 19 Alupigment extruded, added directly with premix; Most of the pigment was destroyed
  • Fig. 20 Aluminum pigment extruded, added via sidefeeder, Scheckenkonfiguration with mixing elements as shown in Figure 17; Pigment is only slightly sheared
  • Fig. 21 Aluminum pigment blended in the dry blend process
  • Fig. 22 Aluminum pigment extruded by means of sidefeeder, low shear force, sidefeeder in the rear third of the extruder, screw configuration with conveyor elements from sidefeeder entry Fig. 23: compared to Fig. 22, Pigment Dryblend blended (NO shear) magnified 100 fold; Pigment shape round or oval, only a few small pigment fragments
  • Fig. 24 Pigment vie Sidefeeder extruded, 100 times magnification, most of the pigments still round / oval, only a few fragments
  • Fig. 25 Pigment extruded from the beginning, 100 times magnification, pigment form irregular, very many small fragments
  • FIG. 26 taking up a powder coating chip, pigment via sidefeeder, 200 ⁇ magnification (powder coating chips which were evaluated directly after the extruder and the cooling roll (pressed into flat bread crumbs and mechanically broken))
  • FIG. 27 Powder coating chip, pigment extruded from the beginning, 200 ⁇ magnification (powder coating chips which were evaluated directly after the extruder and the cooling roll (pressed into flat bread, cooled and mechanically broken))
  • Fig. 28 Pigment Masterbatch (pigment in colorless) via Sidefeeder, 200x magnification (pigment extruded in transparent powder coating, ground and coated on an aluminum sheet and baked)
  • Fig. 29 Pigment Masterbatch, pigment from the beginning, 200 ⁇ magnification (pigment extruded in transparent powder coating, ground and coated on an aluminum sheet and baked)
  • the powder coating according to the invention may for example consist of two components, one component being the transparent effect powder coating A, the other an opaque colored base powder coating B.
  • a transparent and colorless powder paint was made from 900 parts Crylcoat® 4642-3 or equivalent polyester, 47 parts Primid® XL-552, 5 parts Richfos® 626, 3 parts benzoin, 5 parts Worlee® Add 902, 5 parts Licowax C Micropowder PM and 2 parts of Tinuvin® mixed together.
  • this premix is metered into a twin-screw extruder (eg ZSK 27) and melted and dispersed with a screw configuration suitable for powder coating production.
  • twin-screw extruder eg ZSK 27
  • Such configurations are familiar to the person skilled in the art.
  • part 5 parts aluminum powder PCU 5000 is added by means of a two-shaft side feed and gravimetric dosing.
  • the screw configuration from the side feeder is shown by way of example in FIG. 17 played. Temperatures of less than 120 ° C. prevail in the extruder. Subsequently, the liquid extrudate is cold-rolled broken and milled in an impact pin mill to powder coating (D 50 smaller than 80 ⁇ ).
  • the size of the pigments depends on the desired effect and can be between 3 ⁇ m and 130 ⁇ m, preferably between 35 ⁇ m and 90 ⁇ m.
  • the proportion by weight of the effect pigments in the total amount in the transparent masterbatch can be between 1% to 40%, in particular between 2% and 10% by weight.
  • the opaque, colored base powder coating B is prepared in the same way as described above and, in addition to the above-mentioned raw materials, also contains color pigments and fillers, but no metallic / effect pigments.
  • the following mixture can be considered: 680 parts CRYLCOAT® 4655-2, 36 parts Primid® XL-552, 5 parts Worlee® Add 902, 8 parts Lanco Wax TF 1890, 18 parts Powder Add 9083, 2 parts Pigment Red 101, 10 parts Pigment Brown 24, 7 parts Pigment Black 7, 24 parts Titan TS-6200, 210 parts Portaryte B 15.
  • effect powder coating A and colored, opaque base powder coating B were mixed in a ratio of 20:80 by drybending. This mixture is done either in a dryblend or in a bonding mixer.
  • Fig. 17 shows an extruder screw, which is the Zumischort via Sidefeeder subsequently equipped with mixing elements.
  • the pigment platelets in the powder coating of the invention were only slightly sheared, bent or cut, whereby the original effect (light reflection and sparkle effect) is maintained.
  • the influence of the addition time and the screw configuration used can be determined by micrographs of the cooled extruder melt (transparent powder coating melt containing dispersed metal pigments).
  • Fig. 18 shows a 200 magnification Auflichtmikroskopsent a cured powder coating film, wherein the pigment was introduced by bonding in the powder coating of the invention, the pigment is only slightly destroyed because of the low shear forces in the bonding mixer.
  • Fig. 19 shows in comparison also in 200-fold magnification, a reflected light microscope image of a cured powder coating film, wherein the pigment by extrusion in the powder coating was introduced, the addition of the pigment was carried out directly with the premix in the extruder, a large part of the pigment was destroyed (hammer blow).
  • FIG. 20 likewise shows a reflected-light microscope image of a cured powder coating film at 200 ⁇ magnification, although the pigment was likewise introduced into the powder coating by extrusion, but the addition was effected via a sidefeeder.
  • the screw configuration and mixing elements were as shown in Fig. 1, it is clearly visible that the pigment was only slightly sheared.
  • FIG. 21 likewise shows a reflected-light microscope image of a cured powder coating film in 200 ⁇ magnification, the aluminum pigment being mixed in by the dry-blending process. Again, it is clearly visible that the pigment was sheared only slightly.
  • FIG. 22 likewise shows a reflected-light microscope image of a cured powder coating film in 200 ⁇ magnification, wherein aluminum pigment was extruded by means of sidefeeder in the rear third of the extruder, the screw configuration had delivery elements from the side feeder entry. Again, it is clearly visible that the pigment was sheared only slightly.
  • the pigments were in this case once extruded from the beginning or once by means of sidefeeder, the melt then cooled, ground and applied as a powder coating on sheets and baked. The result was evaluated visually and also by means of incident light microscopy for comparison purposes. In addition, extrusion tests were also carried out in a transparent lacquer, which at least partially led to the subject of the present invention. On the one hand, the particle sizes in the cold-rolled powder coating chip were measured and, on the other hand, on a sample sheet coated with this varnish.
  • Fig. 25 is also clearly seen that large parts of the pigments no longer have the original, round shape, but only more fragments can be seen.
  • Microscopic analyzes have shown that the effect pigments or their fragments, when added to the inlet of the extruder - together with all other raw materials - in the finished Extrudate or in the cured coating only about 50% of the original diameter. If the pigments were metered in by the sidefeeder and subsequently exposed to only low shear forces (see Fig. 17 of the screw configuration), the average diameter changed only insignificantly.
  • the measurement results are documented in the following table:
  • FIGS. 23 to 29 Some photographs and surveys can be seen in FIGS. 23 to 29. It is also clearly evident here that the pigment, if it has been extruded from the outset, is considerably destroyed. Figs. 23 to 25 were made of sheets coated with the finished powder.
  • FIG. 23 shows a microscope image of a coating produced with powder coating at 100 ⁇ magnification, the effect pigment being mixed in by means of dryblend (NO shearing forces). The shape of the effect pigment remained round or oval.
  • FIG. 24 shows a microscope image of a coating produced with the powder coating of the invention in 100-fold magnification, wherein the effect pigment was extruded by adding the sidefeeder in the transparent powder coating, the majority of the pigments is still round / oval, there are only a few fragments.
  • FIG. 25 shows a microscope image of a coating produced with a comparison powder coating in 100-fold magnification, wherein the effect pigment was coextruded by being fed into the extruder from the outset.
  • the pigment form is irregular, there are many small fragments.
  • Figs. 26 through 29 were taken from powder coating chips which were evaluated directly after the extruder and chill roll (crimp, cool and mechanically break).
  • FIG. 26 shows a microscope image of a powder coating chip as used in the present invention magnified 200 times, wherein the effect pigment was admixed by feeding into the extruder via sidefeeder.
  • FIG. 27 shows a comparison of a microscope image of a comparison powder coating chip in 200-fold magnification, wherein the effect pigment was coextruded by feeding into the extruder from the beginning.
  • FIG. 28 shows a microscope image of a masterbatch effect powder coating A (pigment in transparent powder coating) according to the present invention magnified 200 times, wherein the effect pigment was admixed by feeding into the extruder via sidefeeder, and 29 shows in comparison thereto a microscope image of a comparative masterbatch (pigment in transparent powder coating) at a magnification of 200 times, wherein the effect pigment was coextruded by being fed into the extruder from the outset.
  • Table 1 Si Sparkle Intensity

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Abstract

La présente invention concerne une peinture en poudre contenant au moins une peinture en poudre de base et au moins une peinture en poudre à effet contenant des pigments à effet, lesdits pigments à effet étant dispersés dans une masse fondue de peinture en poudre à effet transparente. La présente invention concerne en outre un procédé de fabrication d'une telle peinture en poudre, ainsi qu'un revêtement à effet contenant ladite peinture en poudre.
EP16767245.0A 2015-09-18 2016-09-16 Peinture en poudre et procédé de fabrication d'une peinture en poudre Pending EP3350265A1 (fr)

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EP15185834.7A EP3144352B1 (fr) 2015-09-18 2015-09-18 Laque en poudre et procédé de fabrication d'une laque en poudre
PCT/EP2016/071919 WO2017046296A1 (fr) 2015-09-18 2016-09-16 Peinture en poudre et procédé de fabrication d'une peinture en poudre

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MX2018002863A (es) 2018-06-18
HUE039903T2 (hu) 2019-02-28
JP6708733B2 (ja) 2020-06-10
CA2999119C (fr) 2020-07-28
US20180258293A1 (en) 2018-09-13
EP3144352A1 (fr) 2017-03-22
CA2999119A1 (fr) 2017-03-23
EP3144352B1 (fr) 2018-05-16
WO2017046296A1 (fr) 2017-03-23
CN108112257A (zh) 2018-06-01
JP2018532012A (ja) 2018-11-01
TR201811209T4 (tr) 2018-09-21

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