DE102004029580A1 - Light absorbing pigments, useful in paints, comprises metallic or metallized laminates whose surface is covered with interference layer that causes increased absorption in the visible spectrum and the laminates are of leafing type - Google Patents

Light absorbing pigments, useful in paints, comprises metallic or metallized laminates whose surface is covered with interference layer that causes increased absorption in the visible spectrum and the laminates are of leafing type Download PDF

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DE102004029580A1
DE102004029580A1 DE102004029580A DE102004029580A DE102004029580A1 DE 102004029580 A1 DE102004029580 A1 DE 102004029580A1 DE 102004029580 A DE102004029580 A DE 102004029580A DE 102004029580 A DE102004029580 A DE 102004029580A DE 102004029580 A1 DE102004029580 A1 DE 102004029580A1
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laminates
paints
absorbing pigments
whose surface
covered
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DE102004029580A
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Andreas Biedermann
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    • 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
    • C09C1/0078—Pigments consisting of flaky, non-metallic substrates, characterised by a surface-region containing free metal
    • 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
    • C09C1/64—Aluminium
    • C09C1/648—Aluminium treated with inorganic and organic, e.g. polymeric, 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/32—Radiation-absorbing paints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S70/00—Details of absorbing elements
    • F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
    • F24S70/225—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption for spectrally selective absorption
    • 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
    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/10—Interference pigments characterized by the core material
    • C09C2200/1054—Interference pigments characterized by the core material the core consisting of a metal
    • 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
    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/10—Interference pigments characterized by the core material
    • C09C2200/1054—Interference pigments characterized by the core material the core consisting of a metal
    • C09C2200/1058—Interference pigments characterized by the core material the core consisting of a metal comprising a protective coating on the metallic layer
    • 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
    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/40—Interference pigments comprising an outermost surface coating
    • C09C2200/402—Organic protective coating
    • C09C2200/403—Low molecular weight materials, e.g. fatty acids
    • 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
    • C09C2200/00—Compositional and structural details of pigments exhibiting interference colours
    • C09C2200/40—Interference pigments comprising an outermost surface coating
    • C09C2200/402—Organic protective coating
    • C09C2200/407—Organosilicon materials, e.g. silanes, silicones
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)

Abstract

Light absorbing pigments (I), for paints, marked by low radiating power in the spectral region of the radiant heat comprises metallic or metallized laminates whose surface is covered with an interference layer such that the coating causes increased absorption in the visible spectral region and that the laminates are of leafing type. Light absorbing pigments (I), for paints, marked by low radiating power in the spectral region of the radiant heat comprises metallic or metallized laminates (in the pigment parts) whose surface is covered with at least one interference layer such that the coating causes increased absorption in the visible spectral region or in parts of the visible spectral region and that the laminates are of leafing type, which is defined by floatation and orientation of laminated pigmented particles at the surface of the paints.

Description

Die Erfindung bezieht sich auf lichtabsorbierende Pigmente für Anstrichstoffe mit niedrigem Emissionsvermögen im Spektralbereich der Wärmestrahlung.The This invention relates to light absorbing pigments for paints with low emissivity in the spectral range of heat radiation.

Die Wärmeabgabe üblicher Oberflächen erfolgt zu einem beachtlichen Teil über die Wärmestrahlung. Es gibt eine Reihe von Aufgabenstellungen, bei denen eine Verringerung der Wärmeabgabe und gleichzeitig eine Absorption im sichtbaren Spektralbereich erforderlich ist. Z.B. Solarabsorber oder Tarnfarben gegen Infrarotausspähung.The Heat dissipation usual surfaces takes place to a considerable extent on the heat radiation. There is a Series of tasks involving a reduction in heat dissipation and simultaneous absorption in the visible spectral range required is. For example, Solar absorber or camouflage colors against infrared spying.

Obwohl die Aufgabestellung „Absorption im Sichtbaren bei geringer Emission im Infraroten" von allgemeiner Art ist, wird im Wesentlichen nach zwei Anwendungsgruppen unterschieden:

  • a) hocheffektive Solarabsorber
  • b) kostengünstige Solarabsorber und Tarnfarben
Although the task "Absorbance in the visible with low emission in the infrared" is of a general nature, a distinction is essentially made between two application groups:
  • a) highly effective solar absorber
  • b) cost-effective solar absorber and camouflage colors

Zu a):
Über hocheffektive Solarabsorber existieren sehr viele Veröffentlichungen. Angestrebt wird niedrige Emission im Infraroten (möglicht kleiner als 0,1) und hohe Absorption im Sichtbaren (möglichst größer 0,9). Eine recht umfangreiche Aufstellung wird z.B. in der DE10121812 dargelegt. Gemeinsam hier ist, dass die Kollektoren vor der Installation der Anlage beschichtet werden. Beschrieben werden Verfahren wie

  • • anodische Oxidation unter Funkenentladung
  • • Ausnutzung von Interferenzeffekten durch Beschichtung der Kollektoroberfläche mit Schichten in der Dicke in der Größenordnung eines Viertels der Wellenlänge der Sonnenstrahlung
  • • anodische Oxidation mit Einlagerung von Pigmenten/Metallteilchen [z.B. AT357389]
  • • galvanische Schwarzchromatierung
  • • sonstige galvanische Beschichtungen
  • • Spray-Pyrolyse und Plasma-CVD
  • • Vakuumverfahren wie Bedampfung und Sputtering
  • • Sol-Gel-Beschichtung mit anschließender Wärmebehandlung.
To a):
There are many publications on highly effective solar absorbers. The aim is low emission in the infrared (less than 0.1 possible) and high absorption in the visible (possibly greater than 0.9). A fairly extensive list is set out, for example, in DE10121812. Common here is that the collectors are coated before installing the system. Described are methods such as
  • • anodic oxidation under spark discharge
  • • Utilization of interference effects by coating the collector surface with layers in thickness on the order of a quarter of the wavelength of solar radiation
  • • anodic oxidation with incorporation of pigments / metal particles [eg AT357389]
  • • galvanic black chromating
  • • other galvanic coatings
  • • Spray pyrolysis and plasma CVD
  • • Vacuum methods such as sputtering and sputtering
  • • Sol-gel coating followed by heat treatment.

Diese Verfahren können in aller Regel vom Anwender vor Ort nicht eingesetzt werden. Häufig sind auch bestimmte Substratmaterialien vorgegeben. Es ist demzufolge kaum möglich, dass der Anwender in eigener Regie aus günstigen, handelsüblichen Installationsmaterialien eine Anlage zur Solarwärmegewinnung aufbaut und den Kollektor dann beschichtet.These Procedures can usually not used by the user on site. Frequently also given certain substrate materials. It is therefore hardly possible, that the user on his own from cheap, commercially available Installation materials builds a plant for solar heat recovery and the Collector then coated.

Zu b):
Kostengünstige Beschichtungen angewandt als Anstrichstoffe zeigen nun eine deutliche Verringerung der Effektivität. Beschrieben werden Emissionsvermögen im Infraroten um 0,5 [z.B. EP0246342, DE3118256 ], meist ohne Angabe der Absorption im Sichtbaren.To b):
Cost-effective coatings applied as paints now show a significant reduction in effectiveness. Emissivity in the infrared is described by 0.5 [eg EP0246342, DE3118256 ], usually without indication of absorption in the visible.

Aufgabe der ErfindungTask of invention

Aufgabe der Erfindung ist es, mittels Pigmenten hocheffektive und kostengünstige Beschichtungen, angewandt als Anstrichstoffe, zu ermöglichen.task It is the object of the invention to use pigments to produce highly effective and cost-effective coatings, applied as paints.

Darstellung der Erfindungpresentation the invention

Der Aufwand um hocheffektive Solarabsorber herzustellen, ist nach dem Stand der Technik recht hoch. Um ein Schichtsystem auf die Kollektoroberfläche aufzubringen, werden Vakuumverfahren eingesetzt. Offenbar ist man der Meinung, dass einfachere Verfahren nicht existieren. Trotzdem soll hier versucht werden, eine einfache und kostengünstige Möglichkeit zu finden.Of the Effort to produce highly effective solar absorber, is after the State of the art quite high. To apply a layer system to the collector surface, Vacuum methods are used. Apparently you think that simpler procedures do not exist. Nevertheless, try here be an easy and inexpensive way to find.

Aus einem anderen technischen Bereich, dem Bereich der goniochromen Farben ist bekannt, dass Interferenzschichtsysteme in Pigmentform hergestellt werden können: z.B. DE3685566 , DE4405492 , DE 4437752 .From another technical field, the field of goniochromic colors is known that interference layer systems can be prepared in pigment form: eg DE3685566 . DE4405492 . DE 4437752 ,

Im ersten Schritt der vorliegenden Erfindung wird ein ähnlicher Schichtaufbau eingesetzt, wie er für goniochrome Farben verwendet wird. Allerdings müssen die Schichtdicken geändert werden, um den Spektralverlauf für lichtabsorbierende Pigmente mit niedrigem Emissionsvermögen im Spektralbereich der Wärmestrahlung zu erzeugen. In Bild 1 ist das Absorptionsvermögen im Sichtbaren und in Bild 2 das Emissionsvermögen im Infraroten dargestellt für folgenden Schichtaufbau:
Aluminiumplättchen – 105 nm SiO2 – 8 nm Nickel. Deutlich erkennbar die Absorption im Sichtbaren, wobei der spektrale Verlauf ähnlich der spektralen Verteilung des Sonnenlichts ist. Im Infraroten oberhalb 5 μm ist das Emissionsvermögen kleiner als 10 %.In the first step of the present invention, a similar layer structure as used for goniochrome colors is employed. However, the layer thicknesses must be changed to produce the spectral profile for light-absorbing pigments with low emissivity in the spectral region of the heat radiation. Figure 1 shows the absorbance in the visible and Figure 2 shows the emissivity in the infrared for the following layer structure:
Aluminum flakes - 105 nm SiO2 - 8 nm nickel. Clearly visible is the absorption in the visible, whereby the spectral course is similar to the spectral distribution of the sunlight. In the infrared above 5 μm, the emissivity is less than 10%.

Diese Interferenzpigmente zeigen zwar den verlangten spektralen Verlauf, verwendet man sie aber in einem üblichen Lack, so steigt das Emissionsvermögen im Infraroten stark an. Ursache sind Absorptionsbande des Lacks.These Although interference pigments show the required spectral curve, but you use them in a usual Lack, so the emissivity in the infrared increases sharply. Cause are absorption band of the paint.

Erst durch einen zweiten erfindungsgemäßen Schritt, die Verwendung von Pigmenten des sogenannten „leafing"-Typs, kann die Aufgabe der Erfindung gelöst werden. Die „leafing" Eigenschaft – das Aufschwimmen und Orientieren der Pigmentteilchen an der Oberfläche – kann z.B. hervorgerufen werden durch eine hydrophobisierende Beschichtung mit Alkylsilanen oder Fettsäuren. Die „leafing" Eigenschaft wird bisher genutzt, um den Glanz im sichtbaren Spektralbereich zu erhöhen, z.B. beschrieben in EP0634459 für Perlglanzpigmente. In der vorliegenden Erfindung dagegen wird durch die Verwendung von Pigmenten des „leafing" Typs erreicht, dass sich erstens keine störenden Mengen von Lack außerhalb der äußeren Pigmentteilchen befinden und zweitens die Wärmestrahlung vom Substrat und Lack abgeschirmt wird.The object of the invention can be achieved only by a second step according to the invention, the use of pigments of the so-called "leafing type." The "leafing" property - the floating and orientation of the pigment particles on the surface - can be caused, for example are made by a hydrophobizing coating with alkyl silanes or fatty acids. The "leafing" property has hitherto been used to increase the gloss in the visible spectral range, for example described in EP0634459 for pearlescent pigments In contrast, in the present invention, the use of pigments of the "leafing" type ensures that no disturbing amounts of Lack outside the outer pigment particles are located and secondly, the heat radiation from the substrate and paint is shielded.

Claims (3)

Lichtabsorbierende Pigmente für Anstrichstoffe mit niedrigem Emissionsvermögen im Spektralbereich der Wärmestrahlung, dadurch gekennzeichnet, dass die Pigmentteilchen aus metallischen oder metallisierten Plättchen bestehen, deren Oberfläche mit mindestens einer Interferenzschicht derart überzogen ist, dass die Beschichtung im sichtbaren Spektralbereich oder in Teilen des sichtbaren Spektralbereichs eine erhöhte Absorption bewirkt und dass die Plättchen vom „leafing" Typ sind, der durch Aufschwimmen und Orientieren von lamellaren Pigmentteilchen an der Oberfläche des Anstrichstoffes definiert ist.Light-absorbing pigments for low emissivity paints in the spectral region of heat radiation, characterized in that the pigment particles consist of metallic or metallized platelets whose surface is coated with at least one interference layer such that the coating in the visible spectral region or in parts of the visible spectral range increased absorption and that the platelets are of the leafing type defined by floating and orienting lamellar pigment particles on the surface of the paint. Lichtabsorbierende Pigmente für Anstrichstoffe nach Anspruch 1, dadurch gekennzeichnet, dass die äußere optisch wirksame Schicht auf den Pigmentteilchen aus einem Metall besteht.Light-absorbing pigments for paints according to claim 1, characterized in that the outer optically active layer on the pigment particles consists of a metal. Lichtabsorbierende Pigmente für Anstrichstoffe nach Anspruch 1, dadurch gekennzeichnet, dass über den interferenzoptischen Schichtaufbau der Pigmentteilchen eine weitere dünne Schicht angeordnet ist, welche die „leafing" Eigenschaft hervorruft, z.B. eine hydrophobisierende Beschichtung mit Alkylsilanen oder Fettsäuren.Light-absorbing pigments for paints according to claim 1, characterized in that over the interference-optical layer structure of the pigment particles a more thin Layer which causes the "leafing" property, for example a hydrophobizing Coating with alkyl silanes or fatty acids.
DE102004029580A 2004-06-18 2004-06-18 Light absorbing pigments, useful in paints, comprises metallic or metallized laminates whose surface is covered with interference layer that causes increased absorption in the visible spectrum and the laminates are of leafing type Withdrawn DE102004029580A1 (en)

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DE102004029580A DE102004029580A1 (en) 2004-06-18 2004-06-18 Light absorbing pigments, useful in paints, comprises metallic or metallized laminates whose surface is covered with interference layer that causes increased absorption in the visible spectrum and the laminates are of leafing type

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Application Number Priority Date Filing Date Title
DE102004029580A DE102004029580A1 (en) 2004-06-18 2004-06-18 Light absorbing pigments, useful in paints, comprises metallic or metallized laminates whose surface is covered with interference layer that causes increased absorption in the visible spectrum and the laminates are of leafing type

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DE102004029580A1 true DE102004029580A1 (en) 2005-12-29

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DE102004029580A Withdrawn DE102004029580A1 (en) 2004-06-18 2004-06-18 Light absorbing pigments, useful in paints, comprises metallic or metallized laminates whose surface is covered with interference layer that causes increased absorption in the visible spectrum and the laminates are of leafing type

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