WO2017214629A1 - Revêtements et surfaces de peinture magnétique - Google Patents

Revêtements et surfaces de peinture magnétique Download PDF

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Publication number
WO2017214629A1
WO2017214629A1 PCT/US2017/037052 US2017037052W WO2017214629A1 WO 2017214629 A1 WO2017214629 A1 WO 2017214629A1 US 2017037052 W US2017037052 W US 2017037052W WO 2017214629 A1 WO2017214629 A1 WO 2017214629A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
particles
formulation
film
coating formulation
Prior art date
Application number
PCT/US2017/037052
Other languages
English (en)
Inventor
Joe MCLELLAN
John HENNEK
Mike White
Xinhua Li
JR. Martin DONBROSKY
Nelson CLEMENT
Original Assignee
Ideapaint, Inc.
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 Ideapaint, Inc. filed Critical Ideapaint, Inc.
Publication of WO2017214629A1 publication Critical patent/WO2017214629A1/fr

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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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/23—Magnetisable or magnetic paints or lacquers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
    • H01F41/16—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor

Definitions

  • This application relates to coatings for walls or other surfaces, which coatings have magnetic properties, products that include such coatings, and methods of making the same.
  • the coloring of current magnetic paints has been particularly problematic. These paints are made by mixing a typical paint formulation with a magnetizable material, like iron or iron oxide. With these paints, the color of the final paint/coating is dictated by the dark grey or black color of the magnetizable material. To compensate for the dark color of the magnetizable material, manufacturers and users of these paints typically tune the paint color by using a whitener/pi gment, such as titanium dioxide (TiO 2 ) particles or organic whitening agents. Large quantities of these whitening agents are needed to compensate for the dark color of the magnetic materials.
  • a whitener/pi gment such as titanium dioxide (TiO 2 ) particles or organic whitening agents. Large quantities of these whitening agents are needed to compensate for the dark color of the magnetic materials.
  • FIG. 1 shows a first magnetic particle of the present invention.
  • a magnetic paint of the present invention is made by adding magnetic particles to a paint formulation. It will be understood by one of ordinary skill in the art that the magnetic particles described herein can be added to any existing paint formulations, including but not limited to those described in U.S. Patent No. 8,309,653, the contents of which are incorporated herein in their entirety.
  • the magnetic particle can be added to any number of paints or primers, including but not limited to oil-based paints, water-based paints, latex paints, low-VOC paints, and the like.
  • a magnetic particle 1 of the present invention which is comprised a magnetic material 2 having a coating that is comprised of an adhesion layer 3, a high index of refraction or reflective hiding layer 4, a pigmented layer 5 that can tint or color the magnetic particle 1, and a binding shell 6 that ensures the layers are bound on the surface.
  • magnetic encompasses both ferromagnetic materials (which have a net magnetic moment in the absence of an external magnetic field) and materials that are magnetizable, i.e. materials which increase the strength of an applied magnetic field, including paramagnetic, ferromagnetic, and superparamagnetic materials.
  • the magnetic particle 1 can be of a particle size ranging from 10 nm to >10 mm.
  • the size can be optimized for a number of variables including but not limited to desired magnetic strength, and factors related to the consistency of the resulting magnetic paint.
  • the particle size is preferably less than the desired coating thickness of the resultant magnetic paint. This limit is ⁇ 100 ⁇ m for most applications.
  • the magnetic material 2 can be comprised of metallic iron (Fe(0)), iron oxides Fe 2 O 3 , FeO), AINiCo, rare earth magnets such as neodymium magnets (NdFeB), metallic cobalt (Co(0)), metallic nickel (Ni(0)), SmCo (samarium cobalt), or similar materials, having a volume magnetic susceptibility greater than ⁇ 1 emu/cm 3 .
  • the physical properties of the magnetic material such as size, shape, and optical properties, as well as the composition of the material, including impurities, can be modified and optimized for the properties of the paint or coating formulation, such as the rheology, the tintability, and the magnetic strength.
  • the incorporation of the adhesion layer 3 is preferable to ensure good adherence of the high index of refraction hiding layer 4 to the surface of the magnetic material 2.
  • This may include reactive materials (i.e., mercaptopropyltrimethoxysilane, tetraemoxysilane, tetramethoxysilane, aluminum trichloride, perhydropolysilazane, aminopropyltrimethoxysilane, titanium isopropoxide, zirconium isopropoxide, and the like), polymers (i.e., polyvinylpyrrolidone), poly(acrylic acid), carboxymethylcellulose, poly(styrenesulfonate), and the like), surfactants (i.e. PEG, polyPEG-PPG, CHAPS, SDS, Triton, and the like), and the like.
  • reactive materials i.e., mercaptopropyltrimethoxysilane, tetraemoxysilane
  • the high index of refraction or reflective hiding layer 4 can be comprised of a material that scatters or reflects visible light. It will be appreciated by one of ordinary skill in the art that these materials may include molecules, particles, or layers that are amorphous or crystalline, including but not limited to silver, gold, platinum, copper, aluminum, plasmonic nanoparticles, titanium dioxide, zirconium dioxide, zinc oxide, tin oxide, zinc sulfide, barium sulfate, or calcium carbonate.
  • the purpose of the hiding layer 4 is to ensure that light does not interact with the magnetic core, and so will not be absorbed.
  • the hiding layer 4 may scatter light efficiently, from particles with high index of refraction, or reflect light efficiently.
  • At least a portion of the magnetic particles are core-shell particles.
  • the magnetic paint may be included as a part of a magnetic dry erasable kit, comprised of the magnetic paint, a white or colored paint, a dry erase system, a roller cover, and instructions for application.
  • a dry erase system or a dry erasable coating is one that yields a writeable- erasable surface that when marked with a marking material, such as a water- or alcohol-based marking material, the marking material can be erased to substantially invisible with little or no ghosting, even after prolonged and repeated use.
  • the magnetic material is coated with a solution of the adhesion promotor, either in a polar or non-polar solvent (depending on the adhesion promoter).
  • the magnetic material is then removed from solution using magnetic separation or filtration and purified to remove any excess adhesion promoter.
  • the magnetic material is then re-dispersed into a solvent with a high index shell forming material, and the shell is grown on the surface of the magnetic particle.
  • the particle can be coated with a binding shell that can act as a stabilization layer, which can also backfill any voids in the high index-of-refraction layer.
  • the magnetic material is coated with a solution of the adhesion promotor, either in a polar or non-polar solvent (depending on the adhesion promoter).
  • the magnetic material is then removed from solution using magnetic separation or filtration and purified to remove any excess adhesion promoter.
  • the magnetic material is then re-dispersed into a solvent with a particulate material with a size smaller than that of the magnetic material, with a high index of refraction. These materials are stirred together, causing the particles to accumulate at the surface of the magnetic material.
  • These coated magnetic particles can then be separated from the solution by magnetic filtration, or by filtration and washing.
  • coated particles can then be affixed to the surface through the use of a binding shell, which can be added directly to the particle solution, or to the washed particles.
  • the binding shell is typically added from a non-aqueous solvent, however it can be added neat.
  • the light magnetic particles can be magnetically separated or filtered from the binder solution, washed several times, vacuum dried, and stored as a dry powder or dispersed in a coating formulation.
  • Luminance (0.2126*R + 0.7152*G + 0.0722*B)
  • % Luminance Luminance/255.
  • paint with a base of red, blue, or green was formulated with coated iron to determine the effect on the paint color.
  • the tinted paint was treated with 20 to 50% coated iron, and mixed together. These magnetic paints were then placed on draw down cards, and drawn down with a 6 mil wet thickness to yield the samples below.
  • a series of formulations were prepared each with 50% by weight of magnetic particles.
  • the formulations were deposited on glass slides resulting in a constant volume coupons with a 1 inch diameter and 0.2 mm wet-film thicknesses.
  • the formulations were allowed to dry.
  • tensile tests were performed by bringing the magnet in to contact with the glass, of thickness 1 mm, on the opposite side from the coupons where the plane of the magnet and the plane of the glass are parallel, then measuring the attractive force between the magnet and the coupons in millipounds, i.e. the "lateral pull strength", using a load cell.
  • the average lateral pull strengths for these formulations shown in the graph below, were determined from measurements taken in triplicate for each sample.
  • coated magnetic particles shown here can be added to any number of paints or primers, including oil based paints, water based paints, latex paints, low-VOC paints, and the like primers to achieve a lightly colored formulation.
  • Colored magnetic coatings can also be made by adding the coated magnetic particles to a colored paint or primer or by adding small volumes of colored pigments to a nearly white paint primer formulation including the coated magnetic particles

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Paints Or Removers (AREA)

Abstract

La présente invention concerne une formulation de revêtement magnétique colorée claire (par exemple, une formulation de peinture) présentant au moins un solvant, et au moins une résine, et une pluralité de particules ferromagnétiques ou magnétisables. La pluralité des particules peut présenter une taille moyenne de particule comprise entre 0,01 µm et 500 µm. La formulation est conçue pour être appliquée sur une surface avec une épaisseur de film humide de 0,2 mm et séchée par évaporation dudit solvant pour former un film. Le film peut être d'une couleur suffisamment claire pour présenter une luminance d'au moins 60.
PCT/US2017/037052 2016-06-10 2017-06-12 Revêtements et surfaces de peinture magnétique WO2017214629A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662348539P 2016-06-10 2016-06-10
US62/348,539 2016-06-10

Publications (1)

Publication Number Publication Date
WO2017214629A1 true WO2017214629A1 (fr) 2017-12-14

Family

ID=60578972

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2017/037052 WO2017214629A1 (fr) 2016-06-10 2017-06-12 Revêtements et surfaces de peinture magnétique

Country Status (1)

Country Link
WO (1) WO2017214629A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554798A (en) * 1964-11-09 1971-01-12 Du Pont Magnetic recording members
US4101904A (en) * 1976-05-27 1978-07-18 Xerox Corporation Magnetographic imaging member and the method of its use
EP0601877A1 (fr) * 1992-12-11 1994-06-15 W.R. Grace & Co.-Conn. Subtrats revêtus et structures stratifiées contenants des dispersions de vermiculite modifié avec des cations organiques, dans un solvant organique
US20020182383A1 (en) * 2001-05-07 2002-12-05 Flex Products, Inc. Methods for producing imaged coated articles by using magnetic pigments
US7390434B2 (en) * 2003-04-25 2008-06-24 Fujifilm Corporation Method and apparatus for producing film from polymer solution, and optical polymer film
US7556841B2 (en) * 2005-06-07 2009-07-07 S. C. Johnson & Son, Inc. Method of applying a design to a surface
WO2011094342A1 (fr) * 2010-01-26 2011-08-04 3M Innovative Properties Company Article effaçable à sec conservant peu de traces et son utilisation
US8137147B2 (en) * 2007-10-30 2012-03-20 Toppan Printing Co., Ltd. Organic electroluminescence display and method for manufacturing the same
US20140356783A1 (en) * 2013-05-30 2014-12-04 Canon Kabushiki Kaisha Magnetic carrier, two-component developer, developer for replenishment, and image forming method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554798A (en) * 1964-11-09 1971-01-12 Du Pont Magnetic recording members
US4101904A (en) * 1976-05-27 1978-07-18 Xerox Corporation Magnetographic imaging member and the method of its use
EP0601877A1 (fr) * 1992-12-11 1994-06-15 W.R. Grace & Co.-Conn. Subtrats revêtus et structures stratifiées contenants des dispersions de vermiculite modifié avec des cations organiques, dans un solvant organique
US20020182383A1 (en) * 2001-05-07 2002-12-05 Flex Products, Inc. Methods for producing imaged coated articles by using magnetic pigments
US7390434B2 (en) * 2003-04-25 2008-06-24 Fujifilm Corporation Method and apparatus for producing film from polymer solution, and optical polymer film
US7556841B2 (en) * 2005-06-07 2009-07-07 S. C. Johnson & Son, Inc. Method of applying a design to a surface
US8137147B2 (en) * 2007-10-30 2012-03-20 Toppan Printing Co., Ltd. Organic electroluminescence display and method for manufacturing the same
WO2011094342A1 (fr) * 2010-01-26 2011-08-04 3M Innovative Properties Company Article effaçable à sec conservant peu de traces et son utilisation
US20140356783A1 (en) * 2013-05-30 2014-12-04 Canon Kabushiki Kaisha Magnetic carrier, two-component developer, developer for replenishment, and image forming method

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