EP2435192A1 - Procédé de revêtement électrostatique - Google Patents

Procédé de revêtement électrostatique

Info

Publication number
EP2435192A1
EP2435192A1 EP10721323A EP10721323A EP2435192A1 EP 2435192 A1 EP2435192 A1 EP 2435192A1 EP 10721323 A EP10721323 A EP 10721323A EP 10721323 A EP10721323 A EP 10721323A EP 2435192 A1 EP2435192 A1 EP 2435192A1
Authority
EP
European Patent Office
Prior art keywords
particles
glass
shaped
platelet
spherical
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.)
Withdrawn
Application number
EP10721323A
Other languages
German (de)
English (en)
Inventor
Matthias Quenzer
Matthias Kuntz
Marc Entenmann
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.)
Merck Patent GmbH
Original Assignee
Merck Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Merck Patent GmbH filed Critical Merck Patent GmbH
Publication of EP2435192A1 publication Critical patent/EP2435192A1/fr
Withdrawn legal-status Critical Current

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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/02—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a matt or rough surface
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • 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

Definitions

  • the present invention relates to the use of particles, in particular platelet-shaped, spherical and / or irregularly shaped particles, of glass and / or alumina in electrostatic
  • the paint / plastic should have an inorganic surface that does not alter the decorative properties. This can be done for example by an SiO 2 layer, which is applied by organometallic substances. Such methods are known. Thus, the plastic headlights of automobiles are protected with such a scratch-resistant SiO 2 layer.
  • the object of the present invention is therefore to improve the weathering properties and cleaning properties of paints and plastics in a simple and cost-effective manner.
  • This object is achieved in that particles of glass and / or aluminum oxide are applied to the surface of paints and plastics by means of an electrostatic coating process.
  • Aluminum oxide particles cover the surfaces of a plastic or paint in a wide range.
  • the scratch resistance, cleanability and weathering stability increase enormously without the decorative properties being greatly changed.
  • the advantage of this method compared to the SoI-GeI coating is the cost and the fact that the particles are made of alumina or a glass that has been produced at high temperatures, and thus have better material properties.
  • An object of the invention is therefore the use of particles of glass and / or alumina in electrostatic coating processes.
  • the particles according to the invention consist of glass and / or aluminum oxide.
  • Platelet-shaped, spherical and / or irregularly shaped particles are preferably used.
  • mixtures containing platelet-shaped, spherical and irregularly shaped particles are suitable.
  • preferably coated particles are used.
  • Platelet-shaped particles are preferably used alone.
  • the use of only spherical particles is possible.
  • Also suitable is the use of irregularly shaped glass or alumina powders or alumina powders coated with SiO 2 .
  • the particles according to the invention can be used in mixtures of glass and aluminum oxide particles. Preferably, glass particles alone or alumina particles alone are used.
  • the glass particles may consist of all known to those skilled glass types, such as. Window glass, C glass, E glass, ECR glass, quartz glass, Duran® glass, laboratory glassware or optical glass. Particularly preferred is E-glass or ECR glass. It may be in the glass particles to irregularly shaped particles or regularly shaped particles, eg. B. balls (including hollow balls) act.
  • platelet-shaped glass particles glass flakes. It glass plates are used with an average thickness of ⁇ 10 microns, preferably ⁇ 2 microns.
  • the thickness of the platelet-shaped particles is in particular ⁇ 1 ⁇ m, preferably ⁇ 0.8 ⁇ m, and particularly preferably ⁇ 0.6 ⁇ m.
  • Particular preference is given to glass flakes having a thickness of from 0.25 to 0.7 ⁇ m.
  • the average particle size of the glass flakes is usually from 5 to 1000 ⁇ m, preferably from 5 to 300 ⁇ m, in particular from 10 to 100 ⁇ m, particularly preferably from 5 to 60 ⁇ m.
  • Particularly preferred glass flakes have an average particle size of 5-150 ⁇ m and a thickness of 0.1-0.8 ⁇ m, preferably 0.2-0.5 ⁇ m.
  • the aspect ratio of the glass flakes is preferably from 10 to 300, in particular from 50 to 200.
  • Suitable glass flakes can be prepared, for example, by the process described in EP 0 289 240.
  • SiO 2 coated glass flakes can be used.
  • the use of glass beads or hollow spheres is preferred, such as. B. SiLibeads® Sigmund-Lindner or retroreflective spheres from 3M or materials from the company Potters-Ballotini, AGSCO, Dantec Dynamics or Sun Microspheres.
  • the alumina particles can consist of all types of alumina known to those skilled in the art. Preference is given to particles of corundum ( ⁇ - - A -
  • platelet-shaped aluminum oxide particles (aluminum oxide flakes).
  • the thickness of the platelet-shaped particles is in particular ⁇ 1 .mu.m, preferably ⁇ 0.8 .mu.m, and particularly preferably ⁇ 0.6 .mu.m.
  • the average particle size of the aluminum oxide flakes is usually 5-1000 ⁇ m, preferably 5-300 ⁇ m, in particular 10-100 ⁇ m, particularly preferably 5-60 ⁇ m.
  • Particularly preferred aluminum oxide flakes have a medium
  • the aspect ratio of the aluminum oxide flakes is preferably from 10 to 300, in particular from 50 to 200.
  • Suitable aluminum oxide flakes can be prepared by processes known to the person skilled in the art, as described, for example, in US Pat. In US 3,718,494, JP-A-57-111239, JP-A-04-39362 or JP-B-03-72527.
  • the aluminum oxide flakes described in EP 0 763 573 which contain titanium oxide as the main component in addition to aluminum oxide.
  • alumina flakes can be used with the properties described above, coated with SiO 2 , z. B. wet-chemical, were. Such coating methods are known in the art and z. As described in EP 0 763 573.
  • uncoated glass and / or aluminum oxide flakes are particularly preferred.
  • uncoated glass flakes are particularly preferred.
  • Another object of the present invention is a process for coating materials comprising the electrostatic application of particles of glass and / or corundum.
  • a powder coating can be applied electrostatically before the direct application of the particles. But the reverse coating order is possible.
  • the particles according to the invention can be applied electrostatically directly as a powder.
  • Electrostatic coating processes are well known to those skilled in the art and are described, e.g. in Römpp Lexikon, paints and printing inks, Georg Thieme Verlag, 10th Edition 1997, page 185 et seq and page 575ff described.
  • the particle powder is preferably charged by shaking triboelectrically and filled in the application unit.
  • the powder output is preferably set as low as possible, but the current flow is preferably set to a higher value, which is matched directly to the type of powder. Current strengths of 30-50 ⁇ A have proven to be advantageous here.
  • the current flow is preferably also kept low in the case of the application of this first layer, in particular 5 to 20 ⁇ A advantageous.
  • the method is relatively insensitive to the set voltage.
  • the particles according to the invention in mixtures with powder coatings, for. B. in so-called DryBIends applied.
  • the particles according to the invention can be used in concentrations of ⁇ 5% by weight, based on the total weight of the DryBend.
  • the particles according to the invention are preferably used in concentrations of from 5 to 10% by weight, based on the total weight of the DryBend. But the use of up to 20 wt .-% is possible. used.
  • the preparation of the powder coatings according to the invention is simple and easy to handle.
  • the particles of the invention are mixed with the powder coating, e.g. with a paddle or tumble mixer. Particularly suitable is the so-called bonding method in which the powder coating base under nitrogen as inert gas on a
  • a reverse layer sequence is also possible by first electrostatically applying the particles directly onto the conductive substrate to be coated and then applying a clear or semitransparent powder coating layer. All layers are then finally thermally baked together at higher temperatures.
  • the particles according to the invention can be applied to any materials, for example iron, steel, aluminum, copper, bronze, brass and Metal foils but also conductive modified surfaces of glass, ceramics and concrete u. ⁇ ., As well as non-conductive surfaces such as wood, glass, ceramics, plastics, inorganic building materials or other materials for decorative and / or protective purposes are applied.
  • the particles according to the invention are preferably applied to plastic and painted surfaces.
  • Another object are thus plastics and coated articles which are coated with an electrostatically applied layer of particles of glass and / or corundum.
  • Example 1 In a first step, a standard powder coating (Tiger Black Series 59 PN 82170 from Tiger Coatings, Austria) is applied to a carrier by means of a spray gun (Optiselect from ITW Gema with slit nozzle or with baffle) (process conditions: Feed max 40, Flow 3.2V, 40kV, Current 5 ⁇ A).
  • a spray gun Optiselect from ITW Gema with slit nozzle or with baffle
  • the coatings are then baked in a circulating air oven (type UMT 6200 from Thermo, Hanau, Germany, hanging) at 200 ° C. for 15 minutes.
  • a powder coating layer is obtained in which glass flakes are incorporated without the color of the coating changing significantly.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne l'utilisation de particules, notamment de particules en forme de plaquettes, sphériques et/ou de formes irrégulières, réalisées en verre et/ou en oxyde d'aluminium, dans des procédés de revêtement électrostatiques, des procédés de revêtement électrostatiques et des plastiques ainsi que des articles vernis revêtus au moyen de ces procédés.
EP10721323A 2009-05-29 2010-05-12 Procédé de revêtement électrostatique Withdrawn EP2435192A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910023159 DE102009023159A1 (de) 2009-05-29 2009-05-29 Elektrostatisches Beschichtungsverfahren
PCT/EP2010/002948 WO2010136123A1 (fr) 2009-05-29 2010-05-12 Procédé de revêtement électrostatique

Publications (1)

Publication Number Publication Date
EP2435192A1 true EP2435192A1 (fr) 2012-04-04

Family

ID=42557321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10721323A Withdrawn EP2435192A1 (fr) 2009-05-29 2010-05-12 Procédé de revêtement électrostatique

Country Status (3)

Country Link
EP (1) EP2435192A1 (fr)
DE (1) DE102009023159A1 (fr)
WO (1) WO2010136123A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009023158A1 (de) * 2009-05-29 2010-12-02 Merck Patent Gmbh Beschichtete Partikel und deren Verwendung
DE102009058297A1 (de) 2009-12-01 2011-06-09 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. N-Allylcarbamat-Verbindungen und deren Verwendung, insbesondere in strahlungshärtenden Beschichtungen
DE202012003115U1 (de) 2012-03-28 2012-07-05 Reinhold Gregarek Verbessertes tribostatisches Aufladungsrohr

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718494A (en) 1971-03-04 1973-02-27 Du Pont Sheet-like alpha aluminum oxide
CH654819A5 (de) 1980-09-23 1986-03-14 Alusuisse Verfahren zur herstellung von grobkristallinem alpha-aluminiumoxid und dessen verwendung.
DE3326701C2 (de) * 1983-07-23 1985-05-30 Hüni + Co KG, 7990 Friedrichshafen Verfahren zur Aufbringung eines rauhen Oberflächenbelages auf einem Werkstück
GB8709608D0 (en) 1987-04-23 1987-05-28 Corrocoat Ltd Forming glass flakes
JP2549452B2 (ja) 1990-06-06 1996-10-30 工業技術院長 塗料用アルミナ顔料
DE4238380B4 (de) 1992-11-13 2004-02-19 Merck Patent Gmbh Verfahren zum Beschichten von Substratmaterialien mit einer glänzenden Beschichtung
JPH09504830A (ja) * 1993-11-11 1997-05-13 石川島播磨重工業株式会社 連続鋳造鋼ストリップ
JP3242561B2 (ja) 1995-09-14 2001-12-25 メルク・ジヤパン株式会社 薄片状酸化アルミニウム、真珠光沢顔料及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010136123A1 *

Also Published As

Publication number Publication date
WO2010136123A1 (fr) 2010-12-02
DE102009023159A1 (de) 2010-12-02

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