EP2321069B1 - Verfahren zur beschichtung eines stahlsubstrats und beschichtetes stahlsubstrat - Google Patents

Verfahren zur beschichtung eines stahlsubstrats und beschichtetes stahlsubstrat Download PDF

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Publication number
EP2321069B1
EP2321069B1 EP09772154.2A EP09772154A EP2321069B1 EP 2321069 B1 EP2321069 B1 EP 2321069B1 EP 09772154 A EP09772154 A EP 09772154A EP 2321069 B1 EP2321069 B1 EP 2321069B1
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EP
European Patent Office
Prior art keywords
paint
dry film
lubricant
coating
film lubricant
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.)
Active
Application number
EP09772154.2A
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English (en)
French (fr)
Other versions
EP2321069A1 (de
Inventor
Laurence Véronique Yvonne GUIO
Martin Simon Brunnock
Neil Mathieson Craik
Vernon John
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.)
Tata Steel UK Ltd
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Tata Steel UK Ltd
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Publication date
Application filed by Tata Steel UK Ltd filed Critical Tata Steel UK Ltd
Priority to EP09772154.2A priority Critical patent/EP2321069B1/de
Publication of EP2321069A1 publication Critical patent/EP2321069A1/de
Application granted granted Critical
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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
    • 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
    • B05D7/14—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 to metal, e.g. car bodies
    • 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
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • 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
    • B05D2252/00—Sheets
    • 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
    • B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding

Definitions

  • the invention relates to a method for coating a steel substrate, wherein pickled hot rolled steel strip, cold rolled steel strip or zinc-coated steel strip - hereafter referred to as steel strip material, has been provided with a lubricant for corrosion protection before shipping and wherein the lubricated strip material is worked and/or formed to manufacture the steel substrate, and before and/or after the working and/or forming the steel substrate is coated with a paint system.
  • the invention also relates to a coated steel substrate.
  • DE102007020552 relates to a method for coating a steel substrate, wherein steel strip material has been provided with a lubricant.
  • the steel substrate is coated while the lubricant remains on the steel with a paint system comprising a solvent-free mixture from epoxy resin in bisphenol A and/or bisphenol F-base, glycidyl ether as reactive diluent, a curing agent based on an amine adduct (addition compound) from a polyamine and/or generic amines with primary, secondary and tertiary amino groups, fillers and additives on the surface, by filling, brushing, rolling or spraying; and treating the surface at 15 C.
  • a paint system comprising a solvent-free mixture from epoxy resin in bisphenol A and/or bisphenol F-base, glycidyl ether as reactive diluent, a curing agent based on an amine adduct (addition compound) from a polyamine and/or generic amines with primary,
  • EP0577486 relates to a method for the temporary corrosion protection of a metal substrate, by applying on the said metal substrate an emulsion obtained by dispersing in water an oily phase comprising a mineral oil, a surface-active agent and a corrosion inhibitor, and drying said coated metal substrate until a dry film is obtained.
  • Lubricants in general have to be removed by degreasing and the substrate has to be pre-treated, before a paint system can be applied to or on the substrate.
  • a lubricant has not been removed or the substrate has not been pre-treated, this results in a poor quality of the painted product, meaning that the paint adheres badly to the substrate.
  • Such products are commercially unacceptable.
  • one or more of these objects are reached by implementing a method for coating a steel substrate, wherein steel strip material has been provided with a lubricant for corrosion protection before shipping and/or storing, and wherein the lubricated strip material is worked and/or formed to manufacture the steel substrate, and before and/or after the working and/or forming the steel substrate is coated with a paint system, wherein the steel substrate is coated while the lubricant remains on the steel, and the lubricant that is used is a dry film lubricant, and the dry film lubricant contains ester-based polymers. It has been found that dry film lubricants can provide the adhesion that is necessary for the paint systems used.
  • the inventors have found that it is possible to paint steel substrates without removing the lubricant, which is always applied as corrosion protection, when certain lubricants are used.
  • the adhesion of the paint on the substrate is at least as good as when the lubricant has been removed.
  • the standard procedure to remove the lubricant or to pre-treat the steel substrate by using hazardous degrease or pre-treatment chemicals can thus be omitted, which on the one hand makes the method both cheaper and faster, because the method is easier, and on the other hand improves the environmental position of the overall painting procedure.
  • the dry film lubricant preferably contains ester-based polymers and/or ester-based organic molecules and/or saturated hydrocarbons and/or unsaturated hydrocarbons and/or viscosity modifiers and/or corrosion prevention additives.
  • the dry film lubricants containing one or more of the above constituents have shown it is possible to use paint systems without removing the dry film lubricant.
  • the dry film lubricant contains a mixture of aliphatic hydrocarbons and saturated esters. This mixture has shown to give an adhesion of the paint on the substrate while the dry film lubricants remains on the substrate, that is as good as when the lubricant has been removed.
  • the steel substrate is used for purposes outside the automotive sector.
  • Such purposes encompass all types of industrial products including furniture for office and household use, such as filing cabinets, shelving for outlets and drum manufacture.
  • the lubricant or dry film lubricant has been applied to the steel strip material at a coating weight of 0.3 - 3.0 g/m 2 .
  • a coating weight lower than 0.3 g/m 2 the corrosion protection is too low; with a coating weight above 3.0 g/m 2 the adhesion of the paint to the substrate is believed to diminish.
  • the coating weight is between 0.5 g/m 2 and 2.0 g/m 2 .
  • the lubricant or dry film lubricant has been applied at speeds between 20 and 600 m/min. Speeds lower than 20 m/min are not economical; speeds higher than 600 m/min are technically difficult to realise. A preferred range is a speed between 100 and 300 m/min, which is economically viable.
  • the lubricant or dry film lubricant has been applied using an electrostatic oiler or using hot melt application technology or through the use of a high speed coating technique such as a chemcoater or spray disk process.
  • a high speed coating technique such as a chemcoater or spray disk process.
  • the paint system that is used in the method described above preferably is in liquid form or in powder form, which paint system preferably is a derivate of phenolics, acrylics, esters, urethanes or epoxies, and mixtures thereof.
  • paint (or lacquer) systems are in wide use for the coating of steel substrates, and these paint systems are perfectly suitable for coating steel substrates on the surface of which the lubricant remains present.
  • An example of a mixture is a combination of a polyester and an epoxy phenolic.
  • the liquid paint is applied through roller coating, curtain coating, spray disk coating and derivates thereof.
  • Such application techniques are known in the art, and have proven to be suitable to apply the liquid paint systems mentioned above on a steel substrate on which the lubricant remains present.
  • the powder paint is a thermosetting paint or a thermoplastic paint, and is preferably applied through use of an electrostatic gun.
  • Such powder paint systems are known in the art, and their application methods as well.
  • the lubricated steel substrate that has been coated with a paint system is cured, preferably within the temperature range of 140 - 250° C for up to 1 - 15 minutes. It has been found that such curing temperatures and periods are suitable for paint systems as mentioned above that are applied on a steel substrate with the lubricant remaining on it.
  • the curing of the paint is preferably performed using a gas fired oven, an infra-red oven, a near infra-red oven, an electron beam unit or an induction oven.
  • a gas fired oven an infra-red oven, a near infra-red oven, an electron beam unit or an induction oven.
  • Such equipment is known in the art and all are suitable for a paint on a steel substrate with lubricant.
  • the paint before curing has a thickness between 30 and 120 microns, preferably between 50 and 90 microns. These are thicknesses for which the paint can accommodate the lubricant or dry film lubricant.
  • a steel substrate produced in accordance with the method described above, wherein the substrate has been provided with a coating comprising a lubricant and a paint.
  • the substrate has been worked/formed for purposes outside the automotive sector.
  • Such purposes are for instance office furniture and shelving.
  • substrates have been provided with a dry film lubricant and these substrates have been coated with paint systems.
  • the painted substrates have been tested to assess the adhesion performance.
  • the substrate used was a cold reduced, annealed and temper rolled steel strip having a gauge between 0.62 and 0.78 mm and a width between 902 and 1240 mm.
  • the steel used for these trials was DC01 material. It will be understood by the person skilled in the art that other gauges and width can be used as well; it is known to supply strip in thicknesses in the range of 0.3 mm to 2.2 mm and width in the range of 500 to 2000 mm.
  • the dry film lubricant has been heated to a maximum temperature of approximately 85 °C before it has been applied, so it will have had a temperature of approximately 70 °C when it was applied on the steel strip.
  • the speed of the strip during application of the dry film lubricant has been up to 100 m/min.
  • the speed of the strip during the application of the dry film lubricant has been up to 250 m/min.
  • the steel strip itself has had a temperature of approximately 15 °C before the dry film lubricant has been applied.
  • the dry film lubricant has been applied using an electrostatic oiler.
  • the electrostatic oiler has run with a blade gap typically between 75-200 microns.
  • the dry film lubricant used is a hot melt containing, amongst other ingredients, ester based organic molecules, ester based polymers and unsaturated hydrocarbons
  • the result of the tests thus is that it is possible to use a dry film lubricant on a steel substrate that remains present on the substrate when coated with a paint system, without loss of quality of the adhesion of the coating.
  • the method used involved heating up the samples to 180°C at 10°C/min (to determine melting point), keeping at 180°C for 10 min (curing), subsequent quenching and reheating to 180°C at 10°C/min, to determine the glass transition temperature (Tg) of the cured coating.
  • Step Rate of heating / cooling Rationale 0 - 180°C 10°C/min Determine melting point Tm 180°C 10 min isotherm Curing 180 - 0°C -100°C/min Quenching 0°C 5 min isotherm Equilibration 0 - 180°C 10°C/min Determine Tg of cured coating
  • dry blends of lubricant and powder coating were prepared in-situ in the DSC sample pans. To this end, first a small amount of dry film lubricant (ca. 1 mg) was placed in the DSC sample pan and weighed. Then, the proper amount of powder coating was added to the sample to reach a total content of about 10% lubricant. The same DSC measuring method is used as with the powder coats.
  • dry film lubricant and powder coatings will mix in the liquid state during curing, due to a broad overlap in the temperature ranges over which they are in all the liquid phase.
  • the dry film lubricants have a liquid state starting at approximately 40°C.
  • the dry film lubricants are applied at temperatures around 60 - 80 °C.
  • components of the dry film lubricant for example, unsaturated molecules, undergo co-polymerisation reactions with the powder paint.
  • the unsaturated hydrocarbons in the dry film lubricant can co-polymerize with the powder.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Mounting Of Bearings Or Others (AREA)

Claims (13)

  1. Verfahren zur Beschichtung eines Stahlsubstrats, wobei Stahlstreifenmaterial vor dem Versand und/oder der Lagerung als Korrosionsschutz mit einem Schmiermittel versehen worden ist, und wobei das geschmierte Streifenmaterial bearbeitet und/oder geformt wird, um das Stahlsubstrat herzustellen, und das Stahlsubstrat vor und/oder nach der Bearbeitung und/oder dem Formen mit einem Lacksystem beschichtet wird, dadurch gekennzeichnet, dass das Stahlsubstrat beschichtet wird, während das Schmiermittel auf dem Stahl bleibt, und wobei das Schmiermittel dass verwendet wird ein Trockenfilmschmiermittel, das Polymere auf Esterbasis enthält, ist.
  2. Verfahren nach Anspruch 1, wobei das Trockenfilmschmiermittel organische Moleküle auf Esterbasis und/oder gesättigte Kohlenwasserstoffe und/oder ungesättigte Kohlenwasserstoffe und/oder Viskositätsmodifikatoren und/oder Korrososionsschutzadditive enthält.
  3. Verfahren nach Anspruch 1 oder 2, wobei das Trockenfilmschmiermittel ein Gemisch aus aliphatischen Kohlenwasserstoffen und gesättigten Estern enthält.
  4. Verfahren nach einem der vorstehenden Ansprüche, wobei das Trockenfilmschmiermittel mit einem Beschichtungsgewicht von 0,3 bis 3,0 g/m2 auf das Stahlstreifenmaterial aufgetragen worden ist.
  5. Verfahren nach Anspruch 4, wobei das Trockenfilmschmiermittel mit Geschwindigkeiten zwischen 20 und 600 m/Min. aufgetragen worden ist.
  6. Verfahren nach Anspruch 4 oder 5, wobei das Trockenfilmschmiermittel unter Verwendung eines elektrostatischen Ölers oder unter Verwendung einer Schmelzapplikationstechnologie oder unter Verwendung einer Hochgeschwindigkeitsbeschichtungstechnologie, wie etwa eines Chemcoaters oder eines Sprühscheibenverfahrens aufgetragen worden ist.
  7. Verfahren nach einem der vorstehenden Ansprüche, wobei das Lacksystem in flüssiger Form oder in Pulverform vorgesehen ist, wobei das Lacksystem vorzugsweise ein Derivat von Phenolen, Acrylen, Estern, Urethanen oder Epoxiden und Gemischen davon ist.
  8. Verfahren nach Anspruch 7, wobei der flüssige Lack aufgetragen wird durch Walzbeschichtung, Gießbeschichtung, Sprühscheibenbeschichtung und Derivate davon.
  9. Verfahren nach Anspruch 7, wobei der Pulverlack ein wärmeaushärtender Lack oder ein thermoplastischer Lack ist, und wobei er vorzugsweise unter Verwendung einer elektrostatischen Pistole aufgetragen wird.
  10. Verfahren nach einem der Ansprüche 7 bis 9, wobei das mit einem Lacksystem beschichtete geschmierte Stahlsubstrat gehärtet wird, vorzugsweise für 1 bis 15 Minuten auf einer Temperatur zwischen 140 bis 250 °C.
  11. Verfahren nach Anspruch 10, wobei das Härten des Lacks unter Verwendung eines Gasofens, eines Infrarotofens, eines Ofens mit kurzwelliger Infrarotstrahlung, einer Elektronenstrahleinheit oder eines Induktionsofens durchgeführt wird.
  12. Verfahren nach einem der vorstehenden Ansprüche, wobei der Lack vor dem Härten eine Dicke zwischen 30 und 120 Mikron aufweist, vorzugsweise zwischen 50 und 90 Mikron.
  13. Stahlsubstrat, das gemäß einem der vorstehenden Ansprüche hergestellt worden ist, wobei das Substrat mit einer Beschichtung versehen ist, die ein Trockenfilmschmiermittel und einen Lack umfasst, und wobei das Trockenfilmschmiermittel Polymere auf Esterbasis enthält.
EP09772154.2A 2008-07-04 2009-07-01 Verfahren zur beschichtung eines stahlsubstrats und beschichtetes stahlsubstrat Active EP2321069B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09772154.2A EP2321069B1 (de) 2008-07-04 2009-07-01 Verfahren zur beschichtung eines stahlsubstrats und beschichtetes stahlsubstrat

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP08104645 2008-07-04
US7851508P 2008-07-07 2008-07-07
EP08017591 2008-10-07
PCT/EP2009/004743 WO2010000454A1 (en) 2008-07-04 2009-07-01 Method for coating a steel substrate, and coated steel substrate
EP09772154.2A EP2321069B1 (de) 2008-07-04 2009-07-01 Verfahren zur beschichtung eines stahlsubstrats und beschichtetes stahlsubstrat

Publications (2)

Publication Number Publication Date
EP2321069A1 EP2321069A1 (de) 2011-05-18
EP2321069B1 true EP2321069B1 (de) 2017-11-01

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EP (1) EP2321069B1 (de)
ES (1) ES2647563T3 (de)
WO (1) WO2010000454A1 (de)
ZA (1) ZA201100323B (de)

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ZA201100323B (en) 2012-03-28
ES2647563T3 (es) 2017-12-22
EP2321069A1 (de) 2011-05-18
WO2010000454A1 (en) 2010-01-07

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