EP2214917A1 - Processus de décoration de substrats munis d'un revêtement en poudre - Google Patents

Processus de décoration de substrats munis d'un revêtement en poudre

Info

Publication number
EP2214917A1
EP2214917A1 EP08854641A EP08854641A EP2214917A1 EP 2214917 A1 EP2214917 A1 EP 2214917A1 EP 08854641 A EP08854641 A EP 08854641A EP 08854641 A EP08854641 A EP 08854641A EP 2214917 A1 EP2214917 A1 EP 2214917A1
Authority
EP
European Patent Office
Prior art keywords
powder coating
range
coating composition
polyester
substrate surface
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Withdrawn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
EP08854641A
Other languages
German (de)
English (en)
Inventor
Ernesto Marelli
Carlos Rodriguez-Santamarta
Volker Rekowski
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.)
Coatings Foreign IP Co LLC
Original Assignee
DuPont Iberica SL
EI Du Pont de Nemours and Co
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 DuPont Iberica SL, EI Du Pont de Nemours and Co filed Critical DuPont Iberica SL
Priority to EP08854641A priority Critical patent/EP2214917A1/fr
Publication of EP2214917A1 publication Critical patent/EP2214917A1/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Withdrawn legal-status Critical Current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
    • 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
    • C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17—Dry transfer
    • B44C1/1712—Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints

Definitions

  • the present invention is directed to a process of decorating a powder coated substrate providing enhanced properties of the decorated coating.
  • Decoration of coated substrates may be proceed by heat transfer of the decoration to the coated substrate via a sublimation process known in the art, in general.
  • EP-A 0060107 discloses a transfer printing on coatings based on thermosetting materials such as alkyd, polyester, polyurethane or epoxy paint.
  • EP-A 1140524 refers to the preparation of decorated substrates using a sublimation process under specific conditions whereby the substrates may be coated with a powder coating composition which is cured under specific conditions.
  • EP-A 1162241 discloses thermally curing powder coating compositions suitable for the preparation of a decorated substrate.
  • the present invention provides a process of decorating a powder coated substrate comprising the steps (a) treating a substrate surface to be coated,
  • a powder coating composition comprising (A) 30 to 80 wt% of a mixture of at least one polyester resin A having a hydroxyl number in the range of 30 to 60 mg KOH/g, a weight average molar mass Mn in a range of 3100 to 5000 and a glass transition temperature Tg of 40 to 60 0 C and at least one polyester resin B having a hydroxyl number in the range of 250 to 350 mg KOH/g, a weight average molar mass Mn in a range of 2000 to 3000,
  • the process according to the invention provides a coated substrate surface with permanent decorations on it and additionally with a very good anti-graffiti performance for a long time period besides good coating properties ⁇ uch as high exterior durability and chemical resistance.
  • the substrate to be coated may be treated by well-known methods to clean the surface such as brushing, washing, de-greasing, phosphating and/or chromating known to person skilled in the art.
  • the substrate surface may also be pre-heated before the application of the powder composition, and then either heated after the application of the powder or not.
  • gas is commonly used for various heating steps, but other methods, e.g., microwaves, conduction methods, Infrared (IR) radiation, near infrared (NIR) radiation, electrical induction heating are also known.
  • IR Infrared
  • NIR near infrared
  • Catalytic gas infrared ovens and electric infrared oven are commonly used, frequently coupled with gas convection ovens.
  • the application of the powder coating composition on the treated surface in step (b), may be done by, e.g., electrostatic spraying, thermal or flame spraying, or fluidized bed coating methods, all of which are known to those skilled in the art.
  • the coating compositions may be applied to, e.g., metallic substrates, non-metallic substrates, such as, paper, wood, plastics, glass and ceramics, including heat-sensitive substrates, as a one-coating system or as coating layer in a multi-layer film build.
  • the powder coating compositions according to the invention can be applied directly on the substrate surface or on a layer of a primer which can be a liquid or a powder based primer, for example, a conductive primer in case of the coating of non-conductive substrates like wood or MDF.
  • the powder coating composition according to the invention can also be applied as a coating layer of a multilayer coating system based on liquid or powder coats, for example, based on a powder or liquid clear coat layer applied onto a color-imparting and/or special effect-imparting base coat layer or a pigmented one-layer powder or liquid top coat applied onto a prior coating.
  • the applied and melted powder coating layer can be cured by thermal energy.
  • the coating layer may, for example, be exposed by convective, gas and/or radiant heating, e.g., infra red (IR) and/or near infra red (NIR) irradiation, as known in the art, to temperatures of, e.g., 100 0 C to 300 0 C, preferably of 180 0 C to 280°C (object temperature in each case).
  • IR infra red
  • NIR near infra red
  • Dual curing means a curing method of the powder coating composition according to the invention where the applied composition can be cured, e.g., both by high energy radiation such as, e.g. ultra violet (UV) irradiation, and by thermal curing methods known by a skilled person.
  • high energy radiation such as, e.g. ultra violet (UV) irradiation
  • thermal curing methods known by a skilled person.
  • step (b) a powder coating composition can be used comprising
  • Suitable polyester resins of component A) are polyester resins A having a hydroxyl number in the range of 30 to 60 mg KOH/g, a weight average molar mass Mn in a range of 3100 to 5000 and a glass transition temperature Tg of 40 to 60 0 C and polyester resins B having a hydroxyl number in the range of 250 to 350 mg KOH/g, a weight average molar mass Mn in a range of 2000 to 3000.
  • the polyesters may be produced in a conventional manner by reacting of one or more aliphatic, aromatic or cycloaliphatic di- or polycarboxylic acids, and the anhydrides and/or esters thereof with polyalcohols, as is, for example, described in D.A. Bates, The Science of Powder Coatings, volumes 1 & 2, Gardiner House, London, 1990, and as known by the person skilled in the art.
  • the polyesters may be produced in conventional manner by performing an esterification reaction of the acid component with the alcohol component in a nitrogen atmosphere, for example, at temperatures of between 140 and 260 0 C, with or without use of conventional esterification catalysts.
  • suitable polycarboxylic acids and the anhydrides and/or esters thereof include maleic acid, fumaric acid, malonic acid, adipic acid, 1.4-cyclohexane dicarboxylic acid, isophthalic acid, terephthalic acid, acrylic acid, and their anhydride form, or mixtures thereof.
  • suitable polyalcohols are benzyl alcohol, butanediol, hexanediol, ethylene glycol, diethylene glycol, pentaerytritol, neopentyl glycol, propylene glycol, and mixtures thereof, in general.
  • the suitable polycarboxylic acids and the suitable polyalcohols are selected in such a way that the polyesters A and the polyesters B according to this invention are obtained having the described hydroxyl number, the weight average molar mass Mn and the glass transition temperature Tg of 40 to 60 0 C.
  • the polyester mixture of component A) may be used together with small amounts of carboxyl-group containing polyesters, for example 0 to 10 wt% of carboxyl-group containing polyesters having a carboxyl-value of, for example, 10 to 200.
  • Preferred is the use of hydroxyl-functionalized polyesters without any addition or with limited addition of carboxyl- group containing polyesters.
  • Crystalline and/or semicrystalline saturated hydroxyl functional polyester resins are also usable which have a Tm (melting temperature) in the range of e.g., 50 to 15O 0 C 1 determined by means of DSC.
  • the polyesters of the invention can also be partially self cross-linkable polyesters containing cross-linkable functional groups known by a person skilled in the art.
  • the content of the polyester resin mixture (A) may be preferably in a range, for example, between 40 to 65 wt%, particularly preferred between 40 to 60 wt%, the wt% being based on the total weight of the powder coating composition.
  • the mixing ratio of polyester A to polyester B is in the range of 70 : 30 to 80 : 20, preferably in a range of 75 : 25.
  • Component B) of this invention is used as hardener of Component A).
  • Hardeners may be used as component B) selected from the group consisting of diisocyanates, polyisocyanates and urethdiones, as blocked or unblocked compounds.
  • diisocyanates and polyisocyanates examples include isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), toluylene diisocyanate, diphenylmethane diisocyanate, trimethylhexane diisocyanate, cyclohexane diisocyanate, cyclohexanedimethylene diisocyanate,
  • IPDI isophorone diisocyanate
  • HDI hexamethylene diisocyanate
  • toluylene diisocyanate diphenylmethane diisocyanate
  • trimethylhexane diisocyanate cyclohexane diisocyanate
  • cyclohexanedimethylene diisocyanate examples include isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), toluylene diisocyanate, diphenylmethane diisocyanate,
  • tetramethylenexylylene diisocyanate, dicyclohexylmethane diisocyanate or the trimerization products for example, aliphatic diisocyanate-based isocyanurates or mixtures thereof.
  • Aromatic diisocyanate compounds may also be present, such as, for example, tolylene diisocyanate (TDI), diphenylalkyl diisocyanates or mixtures thereof. Examples of urethdiones are
  • the diisocyanates, polyisocyanates and urethdiones can be used also in blocked form.
  • Blocking may proceed with conventional agents, e.g., with monoalcohols, glycol ethers, ketoximes, lactams, malonic acid esters, acetoacetic acid esters, for example, ethylene glycol monobutyl ether, butanone oxime, phenol, ethyl acetoacetate, dimethylpyrazole or caprolactam.
  • Preferred is the use of at least one urethdione.
  • the content of the hardeners (B) may be preferably in a range, for example, between 15 and 40 wt%, particularly preferred between 30 to 40 wt%, the wt% being based on the total weight of the powder coating composition.
  • the powder coating composition according to the invention may contain as further components (C) the constituents conventional in powder coating technology, such as, additives, pigments and/or fillers as known by a person skilled in the art.
  • Additives are, for example, degassing auxiliaries, flow-control agents, flatting agents, texturing agents, fillers (extenders), catalysts, dyes, antioxidant, anti-UV, tribostatic or corona electrostatic charging auxiliaries.
  • Compounds having anti-microbial activity may also be added to the powder coating compositions.
  • the crosslinking reaction may be additionally accelerated by the presence in the powder coating composition according to the invention of catalysts known from thermal crosslinking.
  • Such catalysts are, for example, tin salts, bismuth carboxylate, metal complexes, organo-metallic complexes, zirconium chelate complexes. They may be used, for example, in quantities of 0.01 to 3 wt%, based on the total weight of the powder coating composition.
  • the powder coating composition of this invention may contain transparent, color-imparting and/or special effect-imparting pigments and/or fillers (extenders).
  • Suitable color-imparting pigments are any conventional coating pigments of an organic or inorganic nature considering their heat stability which must be sufficient to support the curing of the powder coating composition of the invention.
  • inorganic or organic color- imparting pigments are titanium dioxide, micronized titanium dioxide, carbon black, azopigments, and phthalocyanine pigments.
  • special effect-imparting pigments are metal pigments, for example, made from aluminum, copper or other metals, interference pigments, such as, metal oxide coated metal pigments and coated mica.
  • Examples of usable extenders are silicon dioxide, aluminum silicate, barium sulfate, calcium carbonate, magnesium carbonate, micronized dolomite.
  • the constituents are used in conventional amounts known to the person skilled in the art, for example, based on the total weight of the powder coating composition, regarding pigments and/or fillers in quantities of 0 to 40 wt.%, preferred 0 to 30 wt%, regarding the additives in quantities of 0,01 to 10 wt%, preferred 1 to 5 wt%.
  • the powder coating composition according to the invention may be prepared by conventional manufacturing techniques used in the powder coating industry, such as, extrusion and/or grinding processes.
  • the ingredients used in the powder coating composition can be blended together and the mixture is extruded.
  • the mixture is melted and homogenized, a dispersion of pigments is ensured by shearing effect.
  • the extruded material is then cooled on chill roles, broken up and then ground to a fine powder, which can be classified to the desired grain size, for example, to an average particle size of 20 to 200 ⁇ m, preferred 20 to 50 ⁇ m.
  • the powder coating composition may also be prepared by spraying from supercritical solutions, NAD "non-aqueous dispersion” processes or ultrasonic standing wave atomization process.
  • specific components of the composition according to the invention for example, additives, pigment, fillers, may be processed with the finished powder coating particles after extrusion and grinding by a "bonding" process using an impact fusion.
  • the specific components may be mixed with the powder coating particles.
  • the individual powder coating particles are treated to softening their surface so that the components adhere to them and are homogeneously bonded with the surface of the powder coating particles.
  • the softening of the powder particles' surface may be done by heat treating the particles to a temperature, e.g. the glass transition temperature Tg of the composition, in a range, of e.g., 50 to 60 0 C. After ⁇ cooling the mixture the desired particle size of the resulted particles may be proceed by a sieving process.
  • the powder coating composition according to the invention is especially suitable as a coating for the heat transfer of decorations on the substrate coated with the powder coating composition of the invention.
  • step (c) of the process of invention the cured powder coating is covered with a support comprising a decoration, and the decoration is transferred from the support onto the coated substrate surface by heating.
  • the support is put into contact with the coated substrate surface.
  • the contact between the support and the coated surface can be done and can be maintained by applying physical pressure.
  • Physical pressure means each pressure method which is suitable to keep the support on the coated surface.
  • Another method to keep the contact between the support and the coated surface can be done and can be maintained by closing the support as a bag and applying a vacuum.
  • the support is wound around the coated substrate and is closed, and vacuum is applied.
  • the support will adhere on the coated substrate that is put inside it.
  • the heat is applied promoting the migration of the inks from the decoration of the support to the coated substrate surface.
  • the heat can be applied, for example, via the press directly to the support and/or on the coated substrate and/or the support.
  • the heating is performed in a temperature range between 160 and 220 0 C.
  • the contact is kept until a partial or a complete transfer of the decoration is achieved. This can be in a time period of, for example, 20 seconds to 3 minutes, at the below mentioned temperature range. After the transfer
  • the support can be a material based on, for example, paper, plastic or textile, for example, as film or sheet.
  • a powder coating composition according to the invention is prepared using the following ingredients:
  • the ingredients are mixed and extruded in an extruder at 12O 0 C.
  • the melt-mixed formulation is then cooled, broken down, and the resulted material is grinded to a D50 value of 35-40 ⁇ m particle size distribution.
  • the final powder composition is applied to a metal sheet by corona technique and cured by a convention oven, 15 minutes at 200 0 C.
  • the resulted dry film thickness is of 70-80 ⁇ m.
  • the ingredients of each formulation are mixed and extruded in an .extruder at 120 0 C.
  • the melt-mixed formulation is then cooled, broken down, and the resulted material is grinded to a D50 value of 35-40 ⁇ m particle size distribution and then the two resulted compositions based on the Formulation 2.1 and 2.2 are mixed together in a dry blend process.
  • the final powder composition is applied to a metal sheet by corona technique and cured by a convention oven, 15 minutes at 200 0 C.
  • the resulted dry film thickness is of 70-80 ⁇ m.
  • a powder coating composition of prior art used for heat transfer are prepared using the following ingredients, using polyesters A and B different to polyesters A and B of Example 1 regarding the weight average molar mass Mn:
  • the application is performed as described above.
  • the films obtained with the formulations of Example 1 , 2 and 3 are decorated by covering them with a heat transfer film containing sublimatic inks and maintaining them in a press at 200 0 C for 1 minute. After this operation the heat transfer film is removed.
  • Example 3 the antigraffiti products DE: 3.94 DE: 2.62 DE: 3.29 damage the surface
  • Test of aggressiveness aggressiveness evaluation of antigraffiti products used from SNCF (French railway company) on the surface.
  • DE is the measure of difference in colour after cleaning the graffity
  • a low value of DE means that the to antigraffity products eliminate the graffity without damaging the coated surface.

Landscapes

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

Abstract

L'invention concerne un procédé de décoration d'un substrat muni d'un revêtement en poudre consistant : (a) à traiter la surface d'un substrat à revêtir, (b) à appliquer une composition de revêtement en poudre sur la surface du substrat traitée et à polymériser la composition de revêtement en poudre et (c) à recouvrir le revêtement en poudre polymérisé d'un support comportant un décor et à transférer par chauffage le décor sur la surface du substrat revêtue. Selon l'invention, on utilise une composition de revêtement en poudre composée (A) de 30 à 80 % en poids d'un mélange d'au moins une résine polyester A présentant un indice hydroxyle compris entre 30 et 60 mg KOH/g, une masse molaire moyenne pondérale Mn comprise entre 3100 et 5000 et une température de transition vitreuse Tg comprise entre 40 et 60 °C et au moins une résine polyester B présentant un indice hydroxyle compris entre 250 et 350 mg KOH/g, une masse molaire moyenne pondérale Mn comprise entre 2000 et 3000, (B) de 10 à 40 % en poids d'au moins un durcisseur sélectionné dans le groupe constitué des diisocyanates, des polyisocyanates et des uréthdiones, et (C) de 0,01 à 40 % en poids d'au moins un additif, un pigment et/ou une charge pour le revêtement, le pourcentage étant fondé sur le poids total de la composition du revêtement en poudre, et le transfert par chauffage est effectué dans une plage de température comprise entre 160 °C et 220 °C. Le processus procure une surface de substrat revêtue de décors permanents et résistant très bien aux graffitis pendant de longues périodes.
EP08854641A 2007-11-30 2008-11-24 Processus de décoration de substrats munis d'un revêtement en poudre Withdrawn EP2214917A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08854641A EP2214917A1 (fr) 2007-11-30 2008-11-24 Processus de décoration de substrats munis d'un revêtement en poudre

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07381075A EP2065218A1 (fr) 2007-11-30 2007-11-30 Procédé de décoration de substrats revêtus de poudre
PCT/US2008/084522 WO2009070527A1 (fr) 2007-11-30 2008-11-24 Processus de décoration de substrats munis d'un revêtement en poudre
EP08854641A EP2214917A1 (fr) 2007-11-30 2008-11-24 Processus de décoration de substrats munis d'un revêtement en poudre

Publications (1)

Publication Number Publication Date
EP2214917A1 true EP2214917A1 (fr) 2010-08-11

Family

ID=39278341

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07381075A Withdrawn EP2065218A1 (fr) 2007-11-30 2007-11-30 Procédé de décoration de substrats revêtus de poudre
EP08854641A Withdrawn EP2214917A1 (fr) 2007-11-30 2008-11-24 Processus de décoration de substrats munis d'un revêtement en poudre

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP07381075A Withdrawn EP2065218A1 (fr) 2007-11-30 2007-11-30 Procédé de décoration de substrats revêtus de poudre

Country Status (5)

Country Link
EP (2) EP2065218A1 (fr)
CN (1) CN101878119A (fr)
CA (1) CA2705363A1 (fr)
RU (1) RU2499676C2 (fr)
WO (1) WO2009070527A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014099579A1 (fr) 2012-12-17 2014-06-26 Axalta Coating Systems IP Co. LLC Procédé de préparation d'une composition de revêtement en poudre

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2690143A1 (fr) * 2012-07-24 2014-01-29 E.I. Dupont De Nemours And Company Revêtement en poudre avec effet anodisant
CN103497602A (zh) * 2013-09-24 2014-01-08 安徽锐视光电技术有限公司 一种防涂鸦粉末涂料
CN103937398A (zh) * 2014-05-09 2014-07-23 福建万安实业有限公司 一种装饰型材用木纹粉末涂料
CN108431153B (zh) 2015-10-28 2021-11-23 Swimc有限公司 聚氨酯涂料组合物
DE102015015354B4 (de) * 2015-12-01 2017-06-14 Waldemar Frei Verfahren zur Herstellung einer designhaften Oberfläche eines elektrisch leitfähigen Körpers

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IT1283836B1 (it) 1996-08-28 1998-04-30 Viv Int Spa Procedimento per decorare profilati metallici,in materiale plastico e simili e relativa apparecchiatura
EP1140524B1 (fr) 1998-12-03 2003-03-26 Akzo Nobel N.V. Procede de preparation d'un substrat decore
EP1162241B1 (fr) 2000-05-23 2005-08-03 Akzo Nobel Coatings International B.V. Préparation d'un substrat décoré utilisant une composition de revêtement thermodurcissable

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014099579A1 (fr) 2012-12-17 2014-06-26 Axalta Coating Systems IP Co. LLC Procédé de préparation d'une composition de revêtement en poudre

Also Published As

Publication number Publication date
CN101878119A (zh) 2010-11-03
EP2065218A1 (fr) 2009-06-03
CA2705363A1 (fr) 2009-06-04
RU2010126612A (ru) 2012-01-10
WO2009070527A1 (fr) 2009-06-04
RU2499676C2 (ru) 2013-11-27

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