EP3010646A1 - Procédé de revêtement d'une surface d'un substrat électriquement non conducteur au moyen de peintures en poudre - Google Patents

Procédé de revêtement d'une surface d'un substrat électriquement non conducteur au moyen de peintures en poudre

Info

Publication number
EP3010646A1
EP3010646A1 EP14731286.2A EP14731286A EP3010646A1 EP 3010646 A1 EP3010646 A1 EP 3010646A1 EP 14731286 A EP14731286 A EP 14731286A EP 3010646 A1 EP3010646 A1 EP 3010646A1
Authority
EP
European Patent Office
Prior art keywords
coating
substrate
powder
powder coatings
electrostatic
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Withdrawn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
EP14731286.2A
Other languages
German (de)
English (en)
Inventor
Thomas LENDL
René MATTERN
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.)
IGP Pulvertechnik AG
Original Assignee
IGP Pulvertechnik 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 IGP Pulvertechnik AG filed Critical IGP Pulvertechnik AG
Priority to EP14731286.2A priority Critical patent/EP3010646A1/fr
Publication of EP3010646A1 publication Critical patent/EP3010646A1/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Withdrawn legal-status Critical Current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
    • 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
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • 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
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • 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
    • B05D3/06—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 exposure to radiation
    • 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
    • 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
    • B05D3/14—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 electrical means
    • B05D3/141—Plasma treatment
    • B05D3/142—Pretreatment
    • 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
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • 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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • 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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • 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
    • C09D177/00—Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Coating compositions based on derivatives of such polymers
    • 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
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/22—Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
    • B05D1/24—Applying particulate 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
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
    • 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
    • B05D3/0263—After-treatment with IR heaters
    • 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
    • B05D3/0272—After-treatment with ovens
    • 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
    • B05D3/06—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 exposure to radiation
    • B05D3/061—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 exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • 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
    • B05D3/08—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 flames

Definitions

  • the present invention relates to a method for coating a surface of an electrically non-conductive substrate with powder coatings.
  • WO 02/04694 A1 shows a method for applying a coating to a plastic surface by means of a thermal spraying method, wherein the first layer
  • Adhesive is applied.
  • the need for such a primer is considered disadvantageous at the present time.
  • WO 2007/054289 A2 discloses an aqueous powder dispersion and a method for applying such a dispersion to a plastic or a fiber composite.
  • WO 02/46321 A2 shows an aqueous effect
  • Solvent and a method for its use, inter alia, on a plastic or fiber composite.
  • WO 2010/028848 AI apparently a water-based composition of a two-component paint, which in the
  • the curing temperature is below 40 ° C.
  • Such two-component systems are complicated to use, a correct mixing ratio must be considered.
  • EP 1 321 197 A2 discloses a coating method with
  • Powder coatings wherein the powder coating is applied by means of a transfer belt from a fluidized bed to a substrate.
  • the substrate may be conductive or non-conductive.
  • US 2010/266782 A1 discloses a coating method for conductive and non-conductive workpieces by means of two or more powder application. A first applied powder gels on a preheated surface, at least one further powder is applied and the coating is cured by heat input. It is an object of the invention to overcome the disadvantages of the prior art. In particular, a method for
  • an electrically nonconducting substrate is understood as meaning a material or a material having a surface resistance of greater than 10 12 ⁇ (according to DIN EN 61340-2-3: 2000). It should be noted that the determination of the surface resistance is carried out on specimens which are cuboid-shaped and have a dimension in all directions of at least 1 mm x 110 mm x 120 mm (thickness x width x length).
  • a test specimen is to be formed from a plurality of superimposed substrate sections, so that the resulting thickness is at least 1 mm.
  • the determination of the surface resistance should in each case be carried out on at least 3 test specimens, the measured values obtained are too mittein. Measuring probes are to be used as specified in DIN EN 61340-2-3: 2000.
  • the surface of the specimens should be cleaned with a soft cloth moistened with isopropanol. After this cleaning and before the
  • the specimen is to be conditioned for at least one hour at 23 ° C +/- 2 ° C and a relative humidity of 30%.
  • the measurement must be carried out with a test voltage of 100 V. It is the
  • Specimens are at least three measurements to perform, the measurement results per sample are too mittein. All other data relevant for determining the surface resistance can be found in DIN EN 61340-2-3: 2000. In this way, a classification (conductive, dissipative, insulating) of a substrate before coating can be made. Here and in the following, electrostatic properties are discriminated.
  • Measuring device by Wolfgang Warmbier for example. SRM-200 done. Thanks to the integrated electrodes, even smaller substrates with a size of at least 80 mm x 80 mm x 1 mm can be measured.
  • Powder coatings comprises the steps: - Providing a substrate to be coated,
  • Thermosetting, reactive system comprises,
  • the substrate for example, brought from a warehouse and for the
  • Preheating is provided or delivered by a supplier on time for preheating.
  • Preheating is also possible to produce the substrate on site for immediate further processing.
  • partial, in particular substantially complete degassing of the substrate can be effected.
  • the substrate is more or less degassed.
  • the substrate is not damaged by the preheating and / or deformed. Suitable conditions can easily be established by the person skilled in the art, depending on the substrate used.
  • the surface resistance of the substrate is lowered by the preheating to a temperature of 40 to 140 ° C of the substrate to be coated. Especially at
  • the surface resistance can reduce when heated and the corresponding at room temperature electrically insulating substrate are conductive.
  • the coating of the surface with powder coating takes place
  • the powder coating comprises a reactive system, which is curable in particular to form a thermoset, which chemically crosslinks during curing.
  • Reactive systems crosslink during curing and become so
  • Thermosets It thus forms a robust coating layer on the substrate.
  • Such systems form a lacquer layer with high chemical and mechanical-technological properties, ie with a high resistance under load.
  • An inventive coating with powder coating is particularly environmentally friendly, since no solvents are used and any generated overspray can be easily recycled. It can be produced in a single-coat order higher layer thicknesses compared to the liquid paint, whereby they are very resistant to the action of moisture.
  • powder coatings have a high abrasion resistance and are
  • the adhesion can be mediated only by electrostatic effects substantially without melting the powder coating on the substrate.
  • the coating temperature with respect to the powder coating used may be selected such that the temperature below the gelation temperature of
  • the coating temperature corresponds to the temperature of the surface of the substrate immediately before the impact of the powder coating liquid on the substrate.
  • the coating temperature can also be above the
  • Powder coatings in particular by spraying, the surface of the substrate is cooled by the air flow during spraying, for example by means of a spray gun. Therefore, the adhesion is mediated here only by electrostatic effects substantially without melting the powder coating on the substrate.
  • the coating of the surface may take place at an elevated temperature, which is the aforementioned preheating temperature
  • the preheating can take place, in particular in the convection oven, in a temperature range as described above. Of Furthermore, the preheating can take place over a period of 5 seconds to 90 minutes.
  • the preheating can alternatively take place in the infrared and / or near-infrared oven (NIR).
  • NIR near-infrared oven
  • Radiant temperature the wavelength spectrum of the radiator, the nature of the substrate, the use of filters and the IR or NIR absorption behavior of the substrate, this is heated to the desired temperature.
  • the appropriate parameters for this are individually by simple field tests
  • the temperature of the preheating is in one
  • Preheating temperature can be easily determined by practical tests. It should be noted that the shape of the workpiece is maintained by the thermal load.
  • the surface to be coated Before coating, the surface to be coated can be cleaned. Such cleaning removes coarse dust and grease particles from the surface.
  • Cleaning can be done mechanically by brushing or by wiping with a lint-free wipe.
  • the brush or wipe may be moistened with, for example, an alcohol-water mixture, preferably an isopropanol-water mixture having a ratio of 50/50.
  • an alcohol-water mixture preferably an isopropanol-water mixture having a ratio of 50/50.
  • Preheat carried out but can also be carried out after preheating, depending on the type of pretreatment. An increased
  • the pretreatment may be a process selected from the group:
  • Flaming is the simplest method in the field of plastics to activate a surface, to modify the microtopography and at the same time to remove impurities, in particular organic contaminants. Excess oxygen causes the flame to enter the oxidizing area added. This creates polar groups on the surface that activate them. For a short time, the substrate is at its
  • the substrates may be treated with a gas burner and e.g. Propane gas, butane gas or propane-butane gas mixture are flamed.
  • the distance of the flame is typically about 3 cm to 15 cm and the speed of the sweep of the surface of 1 cm / s to 20 cm / s.
  • the surface is activated by the flaming and can with the subsequently applied
  • Powder coating layer to achieve improved intermediate adhesion.
  • the activation of the surface takes place
  • a Pyrosil® layer can be deposited, which increases the surface tension, hydrophilizes the surface and forms a defined chemical
  • a plasma treatment of the substrate can be carried out, for example, with the OpenAir plasma method at atmospheric pressure.
  • energy is supplied to a gas, so that it goes into the plasma state.
  • This energy can be in the form of
  • Heating, applying an electrical voltage or feeding of electromagnetic waves are supplied.
  • Plasma jet is a mixture of mostly positive charged ions, electrons or neutrons.
  • the resulting plasma jet flows onto the substrate and generates polar groups on the substrate surface, so that the surface tension and thus the adhesion of the subsequent lacquer layer are increased.
  • the substrate surface does not increase or only slightly increases. Also the
  • the plasma jet also cleans the surface and removes possible dirt, dust or grease residues,
  • any gas inclusions in the substrate can be expelled to some extent, which subsequently allows for improved surface quality. Similar to flaming, the surface is activated by the plasma treatment, so that with the subsequently applied powder coating an improved
  • the increase of the surface tension of the substrate can be generated before and / or after preheating.
  • a surface tension can already be generated by the manufacturer of the substrate or directly at the time of delivery or at the incoming inspection.
  • the step of coating with powder coating can be carried out by a method or a combination of methods selected from the group: spraying, in particular with a corona or tribo process,
  • a coating by spraying with powder coating has the
  • Spray gun emitted powder cloud homogeneous and "soft", so that a uniform coating is made possible
  • a coating by means of vortex sintering allows a
  • Temperature of the substrate are controlled with sufficient accuracy
  • a thicker lacquer layer can be applied than when spraying.
  • Fluidizing be additionally charged electrostatically and simultaneously provided the substrate to be coated with an opposite charge, especially on its side facing away from the surface to be coated is provided with a Schmidtpol, a thicker coating layer with the same or shorter residence time as in the vortex sintering arise.
  • the spray application can be carried out in parallel and / or downstream from the respective other method.
  • the underside of the profiles can be easily and quickly coated.
  • the coating of the top takes place in parallel or subsequently with one of the known spray applications with corona or
  • the top and bottom of the substrate can be so in one step and / or in one
  • the step of curing the powder coating layer can be done by a method selected from the group:
  • IR infrared radiation
  • NIR near infrared radiation
  • UV ultraviolet radiation
  • convection heat and / or IR radiation and / or NIR radiation for melting and / or curing the lacquer layer
  • Crosslinking becomes a multiplicity of individual macromolecules of the
  • Powder coating linked to a three-dimensional network Powder coating linked to a three-dimensional network.
  • the energy required for curing, in particular for melting and for crosslinking can be entered thermally by convection and / or radiation energy.
  • the energy can in the form of infrared radiation with a wavelength of 3 ⁇ to 50 ⁇ , near infrared radiation with a
  • Wavelength of 0.7 ⁇ to 3 ⁇ or ultraviolet radiation having a wavelength of 1 nm to 380 nm are introduced.
  • the primer may be in the substrate
  • adhesion promoters can also lead to undesirable color changes of the powder coating.
  • Solvent free Powder coatings are generally preferable to those with solvents in terms of environmental aspects. Also the
  • Material utilization is significantly higher due to increased recoverability of the solvent-free powder coating and can be up to 97%, depending on the application.
  • the powder coatings may be selected from the group comprising:
  • Polyester powder coatings meet the highest demands with regard to weathering stability. They are resistant to UV radiation and offer long-term protection, especially for outdoor use, for example for façade applications. In addition, with
  • Polyester powder coatings achieve excellent coating quality.
  • the polyester powder coatings can be different Have networking mechanisms. Systems based on polyaddition do not release any cleavage products during crosslinking. Accordingly, no pinholes or rough will be
  • the paint film can flow away and ensures a smooth flow on the
  • Start temperature understood at which the starter molecule or initiator splits and the reaction can start.
  • Polyester resins are crosslinked with each other. The properties of the two pure systems are combined so that one
  • Polyurethane powder coatings offer a very good flow and excellent weathering and chemical resistance. So are polyurethane powder coatings because of their durability
  • Crosslinking temperatures can reduce energy costs during curing.
  • Fluoropolymer powder coatings have a particularly high UV resistance. They are always used when these outstanding UV resistances are required.
  • polyamide powder coatings have a high degree of flexibility, so that their application to moving or bending and / or torsion-loaded components is preferred.
  • the reactivities of powder coatings can be adjusted specifically. It is distinguished between
  • NT systems ie low-temperature powder coatings, can already be cured at temperatures from 130 ° C., usually from 140 ° C. By using such NT systems can be cured at temperatures from 130 ° C., usually from 140 ° C. By using such NT systems can be cured at temperatures from 130 ° C., usually from 140 ° C. By using such NT systems can be cured at temperatures from 130 ° C., usually from 140 ° C. By using such NT systems can
  • the thermal load of the substrate is reduced.
  • NT systems ie ultra-low temperature powder coatings. These can already be cured at temperatures below 130 ° C, for example at 120 ° C or even at 105 ° C. The development even goes in the direction of temperatures well below 100 ° C. With such UNT systems, it is also possible to coat substrates with powder, which must not be exposed to a higher temperature. The energy required for curing is further reduced.
  • the powder coating may include electrostatic additives that affect the electrostatic properties. Due to their conductivity, these ensure increased conductivity of the powder coating. In this way, poorly conductive substrates can be coated by means of electrostatic coating processes. Electrostatic additives change the electrical
  • Electrostatic additives are known in the field of metal coatings, where they can in particular reduce Faraday cage effects.
  • the substrate may comprise a material selected from the group comprising:
  • GRP glass fiber reinforced plastic
  • PA polyamides
  • MDF medium density fibreboard
  • HDF High density fiberboard
  • CFRP - carbon fiber reinforced plastic
  • the curing of the powder coating on a wood-based substrate can likewise take place in the temperature range from 80 to 170 ° C., preferably 100 to 160 ° C. particularly preferably 120 to 140 ° C. If the relative humidity is too high
  • Moisture of the substrate occurs paint defects in the form of bubbles and ejection. At a too low relative
  • the substrate may comprise a material having a content of glass fibers or of carbon fibers between 20% to 80%, in particular between 30% to 70%, preferably between 40% to 60%.
  • Such substrates allow a considerably higher mechanical load.
  • such substrates as technical
  • the substrate Before coating the substrate, the substrate can be at least partially degassed by thermal action. Such degassing prevents or reduces the formation of bubbles during curing of the powder coating and thus favors a smooth surface of the coating.
  • the invention relates to a method for
  • the invention further relates to the use of a
  • Powder coating comprising one or more electrostatic additives for coating a surface of an electrically non-conductive substrate.
  • a substrate, in particular a non-conductive substrate, with a coated surface produced by a method as described above has the stated advantages.
  • FIG. 1 shows a diagram which shows the
  • Temperature curve and the surface resistance of a substrate as a function of time maps The substrate was placed in a heating oven for 10 seconds to heat and then removed from the oven.
  • the temperature of the stove was constant at 130 ° C. Depending on the thickness of the substrate, this is heated to a temperature between the ambient temperature (outside the furnace) and the temperature of the heating furnace (see.
  • Cooling process measured at room temperature. The measured values are plotted directly after removal from the heating furnace for 2 min. 30 sec.
  • Room temperature cools the substrate to 36 ° C within one minute.
  • the surface resistance increases with decreasing temperature of about 5xl0 10 ohms to about 7x1 ⁇ 11 ohms within a minute. In this area can be complete and
  • Conditions has a sufficiently conductive surface.
  • FIG. 2 shows substrate coatings with characteristic surface resistances. The substrates were preheated and then by electrostatic powder application
  • Figure 2A shows a coated substrate wherein the substrate was not preheated and had a surface resistance of> 10 12 ohms. After an electrostatic powder application, the substrate is insufficiently coated. The white areas have powder of the coating, while in the black areas the substrate can be seen without coating.
  • Powder coating of the substrate with a surface resistance of> 10 12 ohms is incomplete and thus insufficient.
  • Figure 2B shows a coated substrate wherein the substrate was minimally preheated and thus had a surface resistance of ⁇ 11 ohms.
  • FIG. 2C shows a coated substrate according to the invention, which after preheating had a surface resistance of 10 11 ohms.
  • the electrostatic powder application under these conditions leads to a homogeneous, smooth and continuous coating of the substrate.
  • the coating corresponds to a coating, as it is known for metals or conductive substrates.
  • FIG. 3 shows coated components, the coatings taking place under the same conditions.
  • Component 1 has a
  • Powder coating on wherein the powder coating
  • the coating of component 2 does not comprise any electrostatic additives. Especially on the narrow front sides are the advantageous properties mediated by electrostatic additives
  • Component 1 has in contrast to component 2 a advantageous coating on.
  • varnish modifications with electrostatic additives is additionally the
  • a method of coating a surface of an electrically non-conductive substrate with powder coatings comprising
  • Pretreatment is a procedure selected from the group:
  • Powder coating layer by means of a method selected from the group: - Burning in the convection oven at temperatures in one
  • IR Infrared radiation
  • NIR near infrared radiation
  • UV ultraviolet radiation
  • convection heat and / or IR radiation and / or NIR radiation for melting and / or curing the lacquer layer
  • Method according to one of aspects A to K characterized in that the powder coatings are low-temperature powder coatings or ultra-low-temperature powder coatings.
  • the substrate comprises a material selected from the group comprising:
  • PA - polyamides
  • MDF medium density fibreboard
  • HDF High density fiberboard
  • Method according to one of the aspects A to M characterized in that the substrate comprises a material with a content of glass fibers between 20% to 80%, in particular between 30% to 70%, preferably between 40% to 60%.
  • Substrate by thermal action at least partially, in particular substantially completely degassed.
  • Substrate in particular non-conductive substrate, with a coated surface produced by a method according to one of aspects A to O.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne un procédé de revêtement d'une surface d'un substrat électriquement non conducteur au moyen de peintures en poudre, comprenant les étapes suivantes : ‑ préparation d'un substrat à revêtir, ‑ préchauffage du substrat à revêtir à une température de 40 à 140 °C afin d'abaisser la résistance surfacique du substrat à moins de 1012 ohms, de préférence dans la plage de 1010 à moins de 1012 ohms, ‑ revêtement électrostatique monocouche de la surface au moyen d'une peinture en poudre contenant un système réactif, en particulier durcissant pour former un duroplastique, ‑ durcissement de la couche de peinture en poudre à une température maximale de 170 °C.
EP14731286.2A 2013-06-19 2014-06-19 Procédé de revêtement d'une surface d'un substrat électriquement non conducteur au moyen de peintures en poudre Withdrawn EP3010646A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14731286.2A EP3010646A1 (fr) 2013-06-19 2014-06-19 Procédé de revêtement d'une surface d'un substrat électriquement non conducteur au moyen de peintures en poudre

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13172801 2013-06-19
PCT/EP2014/062949 WO2014202724A1 (fr) 2013-06-19 2014-06-19 Procédé de revêtement d'une surface d'un substrat électriquement non conducteur au moyen de peintures en poudre
EP14731286.2A EP3010646A1 (fr) 2013-06-19 2014-06-19 Procédé de revêtement d'une surface d'un substrat électriquement non conducteur au moyen de peintures en poudre

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EP3010646A1 true EP3010646A1 (fr) 2016-04-27

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CN108787388B (zh) * 2017-05-12 2023-10-10 佛山宜可居新材料有限公司 一种使用粉末涂料在人造板材表面形成镜面高光装饰效果的生产工艺及生产设备
DE102017129352A1 (de) * 2017-12-08 2019-06-13 Ensinger Gmbh Polymer-basierendes Substrat sowie Verfahren zu dessen Herstellung
DE102017129353A1 (de) 2017-12-08 2019-06-13 Ensinger Gmbh Polymer-basierendes Substrat sowie Verfahren zu dessen Herstellung
IT201800004997A1 (it) * 2018-05-02 2019-11-02 Impianto e metodo per effettuare rivestimenti di nanomateriali su superfici di oggetti, in particolare impianti di illuminazione
EP3578816A1 (fr) * 2018-06-08 2019-12-11 Dr. Jeßberger GmbH Pompe de réservoir destinée au transport des liquides combustibles et/ou agressifs
CN109517413B (zh) * 2018-12-29 2023-12-26 南通南京大学材料工程技术研究院 一种热敏基材静电喷涂前导电涂层及其制备和装置
CN116871136A (zh) * 2023-08-14 2023-10-13 阜阳大可新材料股份有限公司 一种粉末涂料涂装高密度纤维板的生产方法

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US20160121361A1 (en) 2016-05-05
US10010908B2 (en) 2018-07-03

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