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EP2327482A1 - Procédé de fabrication d'une surface structurée - Google Patents

Procédé de fabrication d'une surface structurée Download PDF

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Publication number
EP2327482A1
EP2327482A1 EP09405209A EP09405209A EP2327482A1 EP 2327482 A1 EP2327482 A1 EP 2327482A1 EP 09405209 A EP09405209 A EP 09405209A EP 09405209 A EP09405209 A EP 09405209A EP 2327482 A1 EP2327482 A1 EP 2327482A1
Authority
EP
European Patent Office
Prior art keywords
coating
solution
hardening
embossing
sol
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Withdrawn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
EP09405209A
Other languages
German (de)
English (en)
Inventor
Benedikt Moser
Dieter Wehrle
Elodie Gazanion
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.)
Constellium Switzerland AG
Original Assignee
Engineered Products Switzerland AG
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 Engineered Products Switzerland AG filed Critical Engineered Products Switzerland AG
Priority to EP09405209A priority Critical patent/EP2327482A1/fr
Publication of EP2327482A1 publication Critical patent/EP2327482A1/fr
Withdrawn legal-status Critical Current

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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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • 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
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface

Definitions

  • the invention relates to a method for producing a structured surface on a carrier material.
  • the properties of a surface such.
  • hydrophilic or hydrophobic behavior or optical effect can be influenced by the topography of the surface.
  • wetting phenomena such.
  • the self-cleaning effect on the leaves of the lotus plant is due to the unique micro- and nanostructures on the surfaces. The leaves of these plants always stay clean because water droplets easily roll off the ultrahydrophobic leaf surface, collecting and removing dirt particles.
  • the self-cleaning effect of water droplets is therefore often referred to as the "lotus effect”.
  • the embossing plate or the embossing roller is made of aluminum with anodized oxidized, porous surface with a regular array of hexagonal pores with a uniform diameter of z. B. about 30 nm (nanometers) and an intermediate distance of about 120 nm.
  • the embossing of the polycarbonate takes place in a temperature range of 150-170 ° C at a pressure of about 3 x 10 5 Pa.
  • Water wettability tests indicate that the contact angle is 85 ° for a smooth surface polycarbonate film and over 140 ° for the nanoscale structure surfaces.
  • EP-B-0 772 514 For example, self-cleaning surfaces of objects having a raised and recessed surface structure are known.
  • the elevations are in the range of 5-200 microns, the wells in the range of 5-100 microns. At least the elevations are made of hydrophobic Polymer materials, such as. B. PTFE.
  • the surface structures can be produced by heated embossing pieces or rolls.
  • tapes in glazing materials e.g. Pure aluminum, high purity aluminum or AlMg alloys based on aluminum with a purity of 99,5% and greater, such as e.g. 99.8%, which produce diffuse or directed light reflection depending on the application, and to coat these with a so-called sol-gel varnish.
  • Suitable sol-gel coatings form a transparent protective layer, which protects the underlying reflective surface from mechanical or chemical influences and thereby ensures a long life of the reflector at high reflection values.
  • Particularly suitable sol-gel coatings are also weather-resistant and are therefore well suited for outdoor use.
  • the transparent protective layer is in particular a clear, colorless, transparent protective layer.
  • the WO 2001/86327 describes such a weatherproof and corrosion-resistant reflector of a reflector body made of aluminum or an aluminum alloy with a reflective surface, wherein the reflector has an outer, final transparent protective layer of a sol-gel lacquer with a thickness of more than 1 micron.
  • the sol-gel lacquer consists of a polysiloxane, which is prepared from an alcoholic silane solution and an aqueous colloidal silica solution.
  • the EP-A-1 791 001 discloses a reflector with an outermost, final transparent protective layer of a sol-gel lacquer of a polysiloxane, wherein the polysiloxane is prepared by acid-catalyzed hydrolysis and condensation of a mixture of a solution A and an aqueous solution B, wherein the solution A is a solution with a first and second alkoxysilane and a solvent which is miscible with the solution A, and the first alkoxysilane is a tetraethoxysilane (TEOS) and the second alkoxysilane is represented by the formula X n Si (OC 2 H 5 ) 4-n , where X is a organic Rest and n is a number from 0 to 3.
  • the paint system is characterized by the fact that, on the one hand, it contains as few harmful components as possible and liberates it during its processing and, on the other hand, has a flash point of> 21 ° C. during each processing step.
  • the invention has for its object to provide a method of the type mentioned above, which allows the production of a structured surface in the micrometer to Submikrometer Scheme in a simple manner.
  • the structured surface should also be environmentally friendly, scratch-resistant and corrosion-resistant.
  • Another object of the invention is to provide a simple cleaning facility for metal surfaces, in particular of aluminum or an aluminum alloy, as used for example in solar reflectors.
  • the die preferably has an embossing structure with three-dimensional embossing elements with dimensions in one Range between about 30 nm (nanometers) and 30 microns (microns) on.
  • embossed structures can be produced by methods known from the prior art.
  • the partial curing and full curing of the coating is preferably carried out in a temperature range of about 130 ° C to 200 ° C, in particular 140 ° C to 160 ° C.
  • the curing preferably takes place continuously in a continuous furnace.
  • the embossing step can be performed with a preferably heated stamping plate.
  • a preferably heated stamping plate it is advantageous to carry out the embossing with a preferably heated embossing roll.
  • the embossing step can also be carried out in a heated chamber.
  • Partial curing of the coating and patterning may be performed at least in part in a single operation.
  • the process according to the invention is suitable for the treatment of support materials made of metal, in particular of aluminum or an aluminum alloy.
  • the textured surface shows a pronounced hydrophobic behavior compared to a smooth surface and consequently a self-cleaning effect.
  • inventive method thus surfaces of support materials, such as.
  • a preferred sol-gel lacquer is a polysiloxane prepared by acid-catalyzed hydrolysis and condensation of a mixture of an alkoxysilane-containing solution A and a solution B containing colloidal silica.
  • the solution A is in particular a solution with a first and second alkoxysilane and a solvent miscible with the solution A
  • the first alkoxysilane is a tetraethoxysilane (TEOS)
  • the second alkoxysilane by the formula X n Si (OC 2 H 5 ) 4 in which X denotes an organic radical and n is a number from 0 to 3.
  • the second alkoxysilane is preferably a methyltriethoxysilane (MTEOS).
  • the solvent of the solution A is preferably a polar solvent, such as alcohol or ethyl acetate, wherein the alcoholic solvent particularly contains or consists of a glycol or a glycol compound, and is in particular an ethylene glycol or buthoxyethanol.
  • a polar solvent such as alcohol or ethyl acetate
  • the alcoholic solvent particularly contains or consists of a glycol or a glycol compound, and is in particular an ethylene glycol or buthoxyethanol.
  • the coating which is applied directly to the carrier material is a sol-gel lacquer which has developed from a sol-gel system applied directly to the aluminum or the aluminum alloy.
  • Gels are dimensionally stable, easily deformable, fluid-rich disperse systems consisting of a solid, irregular, three-dimensional network and a liquid.
  • a sol-gel system is to be understood as a sol-gel lacquer prepared by the sol-gel technology which, after product-appropriate application and curing, forms a hardened protective layer firmly bonded to the substrate, in this case a carrier material.
  • the layer is preferably a transparent hardening sol-gel lacquer, which reveals the color tone of the substrate.
  • transparent hardening sol-gel lacquer is to be understood in particular a clear, colorless, transparent layer.
  • the layer applied to the cleaned surface of the substrate is preferably a sol-gel lacquer, in particular a sol-gel lacquer of a polysiloxane and advantageously a sol-gel lacquer of an alcoholic silane solution, in particular an alkoxysilane solution and a aqueous polysiloxane solution prepared polysiloxane.
  • Polysiloxane is the term for polymers of crosslinked siloxanes.
  • the polysiloxane is in particular by a condensation reaction between hydrolyzed and crosslinkable silanes, especially alkoxysilanes, and colloidal silicic acid.
  • the condensation reaction between hydrolyzed silanes, in particular alkoxysilanes, with one another and hydrolyzed silanes, in particular alkoxysilanes, and colloidal silica leads to the formation of an inorganic network of polysiloxanes.
  • organic groups in particular alkyl groups or simple alkyl groups, are incorporated into the inorganic network via carbon bonds.
  • the organic groups, or the alkyl groups do not directly participate in the polymerization or crosslinking of the siloxanes, i. they do not serve to form an organic polymer system but merely for functionalization.
  • the function is that the organic groups, in particular the alkyl groups, are attached to the outer sides of the polysiloxanes during the sol-gel process and thereby form a water-repellent layer which imparts a pronounced hydrophobic property to the sol-gel lacquer.
  • sol-gel process described leads, as mentioned, by targeted hydrolysis and condensation of alkoxides of silicon and silica to a sol-gel lacquer of an inorganic network with incorporated alkyl groups.
  • the polysiloxanes obtained thereby are more likely to be assigned to the inorganic polymers.
  • the solution A is an alcoholic solution of one or more different alkoxysilanes, wherein the alkoxysilanes are present in an anhydrous medium in non-hydrolyzed form.
  • the solvent is conveniently an alcohol, such as methyl, ethyl, propyl or butyl alcohol and preferably isopropyl alcohol.
  • alkoxysilanes are described by the general formula X n Si (OR) 4-n in which "R” is a simple alkyl, preferably from the group comprising methyl, ethyl, propyl and butyl. "X" is suitably also an alkyl, preferably from the group comprising methyl, ethyl, propyl and butyl.
  • Suitable alkoxysilanes are, for example, tetramethoxysilanes (TMOS) and preferably tetraethoxysilane (TEOS) and methyltrimethoxysilane (MTMOS) and further alkoxysilanes.
  • the solution A is prepared from tetraethoxysilane (TEOS) and / or methyltrimethoxysilane (MTMOS) with a methyl, ethyl or propyl alcohol and in particular with an isopropyl alcohol as solvent.
  • the solution A may e.g. 25-35 wt .-% (wt .-%), in particular 30 wt .-%, TEOS and 15 - 25 wt .-%, in particular 20 wt .-%, containing MTMOS, both dissolved in 40 - 60 wt .-% , in particular 50 wt .-%, isopropyl alcohol.
  • Solution B contains colloidal silica dissolved in water.
  • the solution B is adjusted by means of acid, preferably by means of nitric acid (HNO 3 ) to a pH of between 2.0 and 4.0, preferably between 2.5 and 3.0 and in particular of 2.7.
  • HNO 3 nitric acid
  • the silicic acid used is expediently a silicic acid stabilized in an acid medium, the pH of the silicic acid advantageously being 2 -4.
  • the silicic acid is advantageously as low in alkali as possible.
  • the alkali content (eg Na 2 O) of the silica is preferably below 0.04% by weight.
  • the solution B contains, for example, 70-80% by weight, in particular 75% by weight, of water as solvent and 20-30% by weight, in particular 25% by weight, of colloidal silica.
  • the solution B is expediently by means of nitric acid (HNO 3 ) to a pH between 2.0 to 3.5, preferably between 2.5 to 3.0 and in particular of 2.7.
  • HNO 3 nitric acid
  • the two solutions A and B are preferably mixed in a weight ratio of 7: 3 parts.
  • the sol-gel lacquer is expediently applied in gel form to the support material or to the corresponding surface, or deposited and then dried or cured.
  • the drying process consists in expelling the water and alcohols remaining in the sol-gel paint, which hardens the sol-gel paint and creates a corrosion-resistant and weather-resistant protective layer on the substrate surface.
  • the coating is carried out, for example by application, centrifuging or spraying, expediently in a continuous process which is suitable for the treatment of strip-form carrier material.
  • Particularly preferred coating methods are spraying, spraying, dipping or dip coating.
  • sol-gel systems which are available, for example, under the trade name CERAPAINT from Akzo Nobel, are suitable for the formation of the corrosion protection layer.
  • Corrosion protection layers which are created by applying a sol-gel system, ie the coating of the actual support material with a sol-gel system, require for their preparation a curing or drying process in which the Sol-gel system is converted into the resistant sol-gel varnish.
  • the coated with the sol-gel lacquer carrier material is expediently by means of radiation, such as UV radiation, electron radiation, laser radiation, or by thermal radiation, such as infrared radiation (infrared), or by convection heating or a combination of the aforementioned drying or curing, dried or hardened.
  • radiation such as UV radiation, electron radiation, laser radiation, or by thermal radiation, such as infrared radiation (infrared), or by convection heating or a combination of the aforementioned drying or curing, dried or hardened.
  • Convection heating can conveniently be effected by exposure to heated gases, such as air, nitrogen, noble gases or mixtures thereof.
  • heated gases such as air, nitrogen, noble gases or mixtures thereof.
  • the sol-gel lacquer layer is preferably dried or hardened in a continuous oven.
  • An in Fig. 1 illustrated arrangement for producing a structured surface on a substrate shows an embossing chamber 10 with adjustable internal temperature.
  • the embossing chamber 10 are provided with a coating 14 of a sol-gel lacquer carrier material 12 and a die die 16 with an embossed structure 18.
  • substrate 12 is the Matrizenstkov 16 moves in the arrow direction and pressed with a sufficiently large contact pressure against the coated substrate 12, so that the embossed structure 18 is transferred to the sol-gel coating 14.
  • the surface topographies of the die stamp 16 and embossed thereon substrate 12 and the sol-gel paint coating 14 are complementary to each other, ie peaks or elevations on the embossing surface of Matrizenstkovs 16 become valleys or depressions in the surface the carrier material 12 and vice versa.
  • the pH of solution B was adjusted to about 2.5 with addition of nitric acid (HNO 3 ).
  • the mixed solution was sprayed onto the aluminum sheet samples.
  • sol-gel lacquer coatings were cured to varying degrees at a temperature of 150 ° C. for three different curing times of 3, 5 and 30 minutes corresponding to a curing state "soft", “medium” and “hard”. Coating prior to embossing a partial cure 150 ° C were subjected to 30 minutes, could no longer emboss under the selected pressure conditions.
  • Table 1 Results of embossing tests embossed pattern Conditions during partial curing before embossing temp. / Duration Conditions during embossing temperature / duration / pressure Evaluation of the quality of the embossed structure after full cure at 150 ° C / 30 min. Line pattern according to Fig. 2/3 150 ° / 5 min. 150 ° / 10 min. / 2.5 kN / cm 2 Structure clearly visible Line pattern according to Fig. 4/5 150 ° / 3 min.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP09405209A 2009-11-26 2009-11-26 Procédé de fabrication d'une surface structurée Withdrawn EP2327482A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09405209A EP2327482A1 (fr) 2009-11-26 2009-11-26 Procédé de fabrication d'une surface structurée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09405209A EP2327482A1 (fr) 2009-11-26 2009-11-26 Procédé de fabrication d'une surface structurée

Publications (1)

Publication Number Publication Date
EP2327482A1 true EP2327482A1 (fr) 2011-06-01

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EP09405209A Withdrawn EP2327482A1 (fr) 2009-11-26 2009-11-26 Procédé de fabrication d'une surface structurée

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011085997A1 (fr) * 2010-01-14 2011-07-21 Schott Ag Procédé de fabrication d'une vitre à surface texturée et vitre à surface texturée
DE102011003677A1 (de) * 2011-02-04 2012-08-09 Schott Ag Verbundstoff und Verfahren zu seiner Herstellung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0772514B1 (fr) 1994-07-29 1998-12-23 Wilhelm Barthlott Surfaces autonettoyantes d'objets et leur procede de production
WO2001086327A1 (fr) 2000-05-09 2001-11-15 Alcan Technology & Management Ltd. Reflecteur
EP1791001A1 (fr) 2005-11-25 2007-05-30 Alcan Technology & Management Ltd. Réflecteur
WO2008142322A2 (fr) * 2007-04-04 2008-11-27 Saint-Gobain Glass France Procede de structuration de surface d'un produit a couche sol-gel, produit a couche sol-gel structuree

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0772514B1 (fr) 1994-07-29 1998-12-23 Wilhelm Barthlott Surfaces autonettoyantes d'objets et leur procede de production
WO2001086327A1 (fr) 2000-05-09 2001-11-15 Alcan Technology & Management Ltd. Reflecteur
EP1791001A1 (fr) 2005-11-25 2007-05-30 Alcan Technology & Management Ltd. Réflecteur
WO2008142322A2 (fr) * 2007-04-04 2008-11-27 Saint-Gobain Glass France Procede de structuration de surface d'un produit a couche sol-gel, produit a couche sol-gel structuree

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
A. D. SOMMERS ET AL.: "Wetting phenomena on micro-grooved aluminum surfaces and modeling of the critical droplet size", JOUMAL OF COLLOID AND INTERFACE SCIENCE, vol. 328, 2008, pages 402 - 411
CHAOWEI GUO ET AL.: "Large-Area Fabrication of a Nanostructure-Induced Hydrophobic Surface from a Hydrophilic Polymer", CHEMPHYS CHEM, vol. 5, 2004, pages 750 - 753
R. TAURINO ET AL.: "Facile preparation of superhydrophobic coatings by sol-gel processes", JOURNAL OF COLLOID AND INTERFACE SCIENCE, vol. 325, 2008, pages 149 - 156

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011085997A1 (fr) * 2010-01-14 2011-07-21 Schott Ag Procédé de fabrication d'une vitre à surface texturée et vitre à surface texturée
CN102712517A (zh) * 2010-01-14 2012-10-03 肖特公开股份有限公司 制造具有结构化表面的玻璃片的方法和具有结构化表面的玻璃片
EP2523915B1 (fr) * 2010-01-14 2017-01-11 Schott AG Procédé de fabrication d'une vitre à surface texturée et vitre à surface texturée
EP2523916B1 (fr) * 2010-01-14 2017-08-23 Schott AG Procédé de fabrication d'une vitre à surface texturée et vitre à surface texturée
DE102011003677A1 (de) * 2011-02-04 2012-08-09 Schott Ag Verbundstoff und Verfahren zu seiner Herstellung
DE102011003677B4 (de) * 2011-02-04 2015-09-24 Schott Ag Verbundstoff, Verfahren zu seiner Herstellung und Verwendung des Verbundstoffes

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