EP1353882A1 - Procede de traitement anti-salissure de surfaces - Google Patents

Procede de traitement anti-salissure de surfaces

Info

Publication number
EP1353882A1
EP1353882A1 EP02702249A EP02702249A EP1353882A1 EP 1353882 A1 EP1353882 A1 EP 1353882A1 EP 02702249 A EP02702249 A EP 02702249A EP 02702249 A EP02702249 A EP 02702249A EP 1353882 A1 EP1353882 A1 EP 1353882A1
Authority
EP
European Patent Office
Prior art keywords
dirt
repellent
coated
particles
repellent surfaces
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Withdrawn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
EP02702249A
Other languages
German (de)
English (en)
Inventor
Harald Keller
Ekkehard Jahns
Christian Lach
Stephan Hüffer
Elmar STÖCKELMANN
Yi Thomann
Thomas Frechen
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP1353882A1 publication Critical patent/EP1353882A1/fr
Withdrawn legal-status Critical Current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
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/006—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
    • C03C17/007—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/42—Coatings comprising at least one inhomogeneous layer consisting of particles only

Definitions

  • the present invention relates to a method for the dirt-repellent finishing of surfaces, characterized in that the surfaces are coated with particles which have an average diameter of 3 nm to 5 ⁇ m and consist of a material which has a surface energy of at least 20 mN / m has and is selected from organic polymers and copolymers and inorganic solid oxides, carbonates, phosphates, silicates or sulfates from groups 3 to 14 of the periodic table.
  • the coatings can be harmful or hinder the process in a variety of ways and lead to the need to repeatedly switch off and clean appropriate reactors or processing machines.
  • Measuring devices encrusted with deposits can lead to incorrect and misleading results, which can lead to operating errors.
  • Coverings are also disadvantageous in other applications. After wetting and evaporation, water leaves residues on surfaces, e.g. Rainwater on window panes, motor vehicles, traffic signs or billboards. Due to the wetting, flowing liquids cause friction on the surfaces to which they are exposed. This leads to friction losses, for example in ships, but also in liquids that flow through pipelines.
  • wetting liquids for example emulsions, suspensions, polymer dispersions, deposits and deposits in the interior of process engineering equipment, for example pipes, boilers, tanks, reactors, heat exchangers, evaporators, condensers. pumps, nozzles, atomizers, spray dryers, crystallizers or filling systems as well as laboratory equipment.
  • wetting By wetting (moistening) unwanted organisms, for example microorganisms, biofilms, algae, lichens, mosses or mussels, can grow on surfaces such as roofs, facades, shower cubicles, ships or heat exchangers.
  • the deposits whose formation is to be prevented are deposits which can be caused, for example, by reactions with and on surfaces. Further reasons are the adhesion to surfaces, which can be caused by van der Waals forces, polarization effects or electrostatic double layers. Important effects are also stagnation of movement on the surface and, if necessary, reactions in the stagnant layers mentioned. Finally, there are: precipitation from solutions, evaporation residues, cracking on locally hot surfaces and microbiological activities.
  • WO 96/04123 discloses self-cleaning surfaces which can be coated with polytetrafluoroethylene and which have particularly hydrophobic properties.
  • the structuring is achieved by etching or embossing the surface, by physical methods
  • Structured surfaces with hydrophobic properties are also known (EP-A 0 933 388), which are produced in such a way that the surface in question is etched, for example, elevations or grooves are produced on the surface at a distance of less than 10 ⁇ m and then coated with a layer of a hydrophobic polymer, for example polyvinylidene fluoride, the surface energy of the corresponding material being less than 20 mN / m.
  • These layers can also contain fluorinated waxes, for example Hostaflone®.
  • the surfaces modified in this way are hydrophobic and oleophobic. Wafer holders in semiconductor production are mentioned as applications, as well as the manufacture or coating of headlights, windshields or covers for solar cells.
  • a disadvantage of the method, however, is that the structuring is difficult to renew after partial mechanical degradation.
  • DE-A 100 22 246 discloses a coating composition which contains a finely divided powder and a binder.
  • a solvent is always required to apply a binder, which is undesirable in many cases.
  • the method according to the invention consists of several steps.
  • the dirt-repellent surface is prepared by making it sticky before the coating step so that the particles to be applied according to the invention are fixed. This can be done through several alternative steps:
  • a so-called primer can be applied, which functions as an adhesive.
  • Suitable primers are, for example, polymer dispersions such as ethylene / acrylic acid copolymers which partially are quickly neutralized with ammonia or amines; a particularly preferred example is Lugalvan DC® from BASF AG; or Acronal® V 210 as a particularly preferred example of an adhesive.
  • Hot melt adhesives and fusible polymers such as polyethylene, polypropylene, polystyrene, polyoctadecyl vinyl ether or polyvinyl chloride are also suitable.
  • Waxes such as polyethylene waxes, polypropylene waxes, carna ⁇ ba waxes, montan waxes or paraffin waxes are also suitable as primers.
  • the thickness of the adhesive layer to be applied is not critical for the method according to the invention and can be from 0.1 ⁇ m to 10 mm.
  • the dirt-repellent surface in cases where the dirt-repellent surface is made of plastics, it can also be heated for a short time to a temperature that is above the glass transition temperature of the plastic in question, or partially dissolved or swollen with a solvent.
  • the dirt-repellent surfaces are coated with particles that have an average diameter of 3 nm to 5 ⁇ m and that consist of a material that has a surface energy of at least 20 mN / m.
  • the particles to be applied are characterized by their hydrophobic surface, their porous structure and their average diameter.
  • the porous structure can best be characterized by the BET surface area, measured according to DIN 66131.
  • the particles used have a BET surface area in the range from 5 to 1000 m 2 / g, preferably from 10 to 800 m 2 / g and particularly preferably from 20 to 500 m 2 / g.
  • the particles consist of a material that has a surface energy of 20 mN / m or more.
  • Suitable materials are organic polymers such as e.g. Polyethylene, polypropylene, polyisobutylene and polystyrene and copolymers thereof with one another or with one or more further olefins such as, for example, styrene, methyl acrylate, ethyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, maleic anhydride or N- methylmaleimide.
  • a preferred polyethylene or polypropylene is described for example in EP-A 0 761 696.
  • solid inorganic oxides solid inorganic oxides, carbonates, phosphates, silicates or sulfates from groups 3 to 14 of the Periodic Table of the Elements, for example calcium oxide, silicon dioxide or aluminum oxide, calcium carbonate, calcium sulfate or calcium silicate, aluminum oxide and silicon dioxide being preferred.
  • Silicon dioxide is particularly preferred in its modification tion as silica gel.
  • Pyrogenic silica gels which are commercially available, for example, as Aerosil® brands from Degussa-Hüls, are very particularly preferred.
  • the solid inorganic oxides can be made hydrophobic thermally by heating to 400 to 800 ° C. and preferably by physisorbed or chemisorbed organic or organometallic compounds.
  • the particles are reacted before the coating step with organometallic compounds which contain at least one functional group, for example alkyl-lithium compounds such as methyl lithium, n-butyl lithium or n-hexyl lithium; or silanes such as hexamethyldisilazane, octyltrimethoxysilane, trimethylchlorosilane or dichlorodimethylsilane.
  • organometallic compounds which contain at least one functional group, for example alkyl-lithium compounds such as methyl lithium, n-butyl lithium or n-hexyl lithium; or silanes such as hexamethyldisilazane, octyltrimethoxysilane, trimethylchlorosilane or dichlorodimethylsilane.
  • the average diameter of the particles is in the range from 3 nm to 5 ⁇ m, preferably from 5 nm to 1 ⁇ m and particularly preferably in the range from 7 nm to 0.5 ⁇ m.
  • the dirt-proof surfaces can be coated with mixtures of particles made of two or more different materials.
  • the mixing ratios can be selected in a wide range, but care must be taken to ensure that the particles made of the material which has a surface energy of more than 20 mN / m are present to more than 50% by weight of the particles, preferably more than 75% by weight .-%.
  • the particles described above are applied to the dirt-repellent surface. This application is also referred to as coating. Coating is done without liquid dispersants.
  • a workpiece to be coated is dusted with the particles described above. This method is particularly suitable for flat surfaces, such as foils.
  • the apparatus or the container is completely or partially filled with the particles, sufficient convection is provided and then the non-firmly adhering particles are removed.
  • the coating step can be repeated if desired.
  • the dirt-repellent surfaces are coated with a particle layer whose thickness is in the range from 3 nm to 10 ⁇ m. Preferred the thickness does not bear more than 1 ⁇ m.
  • the thickness of the particle layer is particularly preferably in the range from 5 nm to 0.3 ⁇ m.
  • the layer is allowed to age before the objects with the surfaces coated according to the invention are used.
  • This aging can last from 20 minutes to about 10 hours, preferably 1 to 3 hours.
  • the aging can be carried out at room temperature or at a slightly elevated temperature; however, the temperature should be so high that particles 10 or primers begin to sinter. It has been shown that a temperature in the range from 20 to 50 ° C. is sufficient in many cases.
  • the choice of materials for the dirt-repellent 15 surfaces is not critical.
  • polymers such as polyethylene, polypropylene, polystyrene, polyester, plexiglass, polyamides, polycarbonates or polyurethanes are suitable, as well as metals and alloys such as silver, palladium, platinum, steels, copper, nickel and paper, cardboard, textiles, stone, ceramics, be - 20 ton, porcelain, glass or wood.
  • Transparent materials such as glass, plexiglass and polycarbonates from the Makrolon® brands are particularly suitable.
  • Another object of the present invention are surfaces which have been made dirt-repellent by the method described above. They can be cleaned extremely easily by simply rinsing them with water, for example; unlike surfaces described in the prior art, no addition of surfactants is necessary. Furthermore, the surfaces according to the invention are highly transparent.
  • the surfaces have proven to be particularly dirt-repellent to the following media: water, coffee, honey, glycerin, 32% by weight aqueous hydrochloric acid, 5% by weight aqueous sodium hydroxide solution, 35 30% by weight aqueous solution of polyacrylic acid, 30% by weight aqueous solution of a copolymer consisting of vinyl pyrolidone and vinyl imidazole, aqueous polymer dispersion Acronal® 290 D (BASF AG), aqueous polymer dispersion Styronal® D 808 (BASF AG).
  • Another object of the present invention are pipes or pipelines with surfaces which are made dirt-repellent by the method described above. They are particularly suitable for pumping through solutions because the dirt-repellent surfaces prevent them from
  • Another object of the present invention relates to textile fabrics and leather, the surface of which is finished by the process according to the invention. They are particularly water and dirt repellent. The high transparency of the surfaces coated according to the invention also ensures that colors and prints are particularly effective.
  • Another object of the present invention are filter materials and separation membranes, for example for chlor-alkali electrolysis, with surfaces equipped according to the invention.
  • Another object of the present invention are papers, cardboard and cardboard with surfaces equipped according to the invention. They prevent wet soaking and reduce pollution.
  • papers, banknotes and official documents are to be mentioned, for the coating of which the method according to the invention is particularly suitable.
  • the high transparency of the surfaces coated according to the invention also ensures that colors and prints are particularly effective.
  • a glass plate was coated with a doctor blade with a doctor blade gap of 50 ⁇ m with an aqueous dispersion of a copolymer consisting of ethylene and acrylic acid (Lugalvan® DC, BASF AG) and dried in room air for 15 minutes.
  • the coated side of the glass plate was dusted with a powder consisting of a hydrophobized silicon dioxide pigment with a BET surface area of 220 m 2 / g (DIN 66131), by distributing the particles through a sieve over the surface, and for 2 hours Stored at 20 ° C.
  • the coated side was then blown off with compressed air. An optically completely transparent layer was obtained which showed no clouding when viewed in the backlight.
  • Figure 1 shows a scanning electron micrograph of the layer produced according to the example.
  • Example 2
  • a glass plate was coated as described in Example 2. In a departure from example 2, the glass plate was stored at 40 ° C. for 2 hours after the powder coating. The coated glass plate was also completely optically transparent and showed no cloudiness when viewed in the backlight.
  • a glass plate was coated as described in Example 2. In a departure from example 2, the glass plate was stored at 80 ° C. for 2 hours after the powder coating. The coated glass plate was not completely transparent optically. When viewed against the light, it showed a slight cloudiness.
  • Vinylpyrolidone and vinylimidazole 35 mg
  • aqueous polymer dispersion Acronal 290 D BASF AG, 58 mg
  • aqueous polymer dispersion Styronal D 808 BASF AG, 46 mg
  • the static contact angle of the coated glass plates from Examples 1 and 2 with water is greater than 160 °.
  • coated glass plates from Examples 1 and 2 were soiled with 100 mg / cm 2 carbon black powder (Printex V from Degussa-Huls AG, average particle diameter of the primary particles: 25 nm) and then washed off with water. The soot powder is removed by the droplets of water so that the original clean surface is restored without the use of cleaning agents.
  • Printex V from Degussa-Huls AG, average particle diameter of the primary particles: 25 nm

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Composite Materials (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

L'invention concerne un procédé de traitement anti-salissure de surfaces caractérisé en ce que les surfaces sont revêtues de particules présentant un diamètre moyen de 3 nm à 5 mu m, et constituées d'un matériau ayant une énergie superficielle d'au moins 20 mN/m.
EP02702249A 2001-01-12 2002-01-10 Procede de traitement anti-salissure de surfaces Withdrawn EP1353882A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10101162 2001-01-12
DE10101162 2001-01-12
PCT/EP2002/000166 WO2002055446A1 (fr) 2001-01-12 2002-01-10 Procede de traitement anti-salissure de surfaces

Publications (1)

Publication Number Publication Date
EP1353882A1 true EP1353882A1 (fr) 2003-10-22

Family

ID=7670341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02702249A Withdrawn EP1353882A1 (fr) 2001-01-12 2002-01-10 Procede de traitement anti-salissure de surfaces

Country Status (4)

Country Link
US (1) US20040047997A1 (fr)
EP (1) EP1353882A1 (fr)
JP (1) JP2004525754A (fr)
WO (1) WO2002055446A1 (fr)

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JP4348401B1 (ja) * 2009-02-13 2009-10-21 東洋アルミニウム株式会社 蓋材
JP5498749B2 (ja) * 2009-09-29 2014-05-21 東洋アルミニウム株式会社 包装材料
JP5647774B2 (ja) * 2009-07-16 2015-01-07 東洋アルミニウム株式会社 包装材料
JP5683827B2 (ja) * 2009-03-30 2015-03-11 東洋アルミニウム株式会社 非付着性容器及びその製造方法
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JP5499127B2 (ja) * 2012-09-23 2014-05-21 東洋アルミニウム株式会社 包装体
JP5499128B2 (ja) * 2012-09-23 2014-05-21 東洋アルミニウム株式会社 包装材料の製造方法
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Also Published As

Publication number Publication date
US20040047997A1 (en) 2004-03-11
JP2004525754A (ja) 2004-08-26
WO2002055446A1 (fr) 2002-07-18

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