EP1372872B1 - Demi-produits et/ou elements en aluminium faconnes et enduits, et procede de fabrication associe - Google Patents

Demi-produits et/ou elements en aluminium faconnes et enduits, et procede de fabrication associe Download PDF

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Publication number
EP1372872B1
EP1372872B1 EP02719679A EP02719679A EP1372872B1 EP 1372872 B1 EP1372872 B1 EP 1372872B1 EP 02719679 A EP02719679 A EP 02719679A EP 02719679 A EP02719679 A EP 02719679A EP 1372872 B1 EP1372872 B1 EP 1372872B1
Authority
EP
European Patent Office
Prior art keywords
aluminium
coated
finished products
components
semi
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.)
Expired - Lifetime
Application number
EP02719679A
Other languages
German (de)
English (en)
Other versions
EP1372872A2 (fr
Inventor
Dieter Lehmann
Michaela Gedan-Smolka
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.)
Leibniz Institut fuer Polymerforschung Dresden eV
Original Assignee
Leibniz Institut fuer Polymerforschung Dresden eV
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 Leibniz Institut fuer Polymerforschung Dresden eV filed Critical Leibniz Institut fuer Polymerforschung Dresden eV
Publication of EP1372872A2 publication Critical patent/EP1372872A2/fr
Application granted granted Critical
Publication of EP1372872B1 publication Critical patent/EP1372872B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • 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
    • B05D3/0209—Multistage baking
    • 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
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al
    • 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
    • B05D2701/10—Coatings being able to withstand changes in the shape of the substrate or to withstand welding withstanding draw and redraw process, punching
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/256—Heavy metal or aluminum or compound thereof

Definitions

  • the invention relates to the fields of chemistry, mechanical engineering and materials science and relates to coated formed aluminum semi-finished products and / or components which are coated with a two-stage curable / crosslinkable coating composition for a form-stable coating and a process for their preparation.
  • curable uretdione group-containing compositions which can be cured in two-stage reactions.
  • the first stage preferably proceeds via an allophanate formation of less than 160.degree. From temperatures greater than 170 ° C arise under Urethanitatien to form the crosslinked final state.
  • curable compositions preferably used for the production of powder coatings and their processes for the preparation and processing are described, which are used specifically for multi-stage reactions and preferably for two-stage reactions. These compounds cure in multi-step reactions, with the first step catalyzed at low temperatures.
  • a disadvantage of the known coatings is that substantially no deformation-stable coating can be achieved.
  • the object of the invention is to provide and produce coated shaped aluminum semi-finished products and / or components that are still reshapeable as semi-finished products while maintaining a closed coating and cured at higher temperatures, so that at the end also a closed coating is obtained.
  • the coated convertible aluminum semi-finished products and / or components according to the invention are coated with at least two-stage curable / crosslinkable coating compositions in the form of a melt coating composition or as a powder coating or as a paint dispersion or as a solvent system and at most partially cured / partially crosslinked.
  • the formed coating film is elastic and is present during subsequent forming processes substantially as a closed coating film.
  • the coated aluminum semi-finished products and / or components according to the invention are provided with at least one, in at least a second reaction stage after a forming process, substantially cured / crosslinked coating film, wherein the curing / crosslinking has occurred under the conditions of the Nachkristallisation the aluminum (alloy).
  • the coated formable aluminum semi-finished products and / or components are coated completely or partially or on one side or inside or outside with the coating film.
  • the coated convertible aluminum semi-finished products and / or components are provided with at least one further layer. It is also advantageous if adhesion is achieved by adhesive interactions and / or by chemical, preferably covalent bonds in the case of the coated formable aluminum semi-finished products and / or components.
  • At least one coating agent consists of a binder system consisting of one or more resin and hardener component (s) with or without additives and / or catalysts (n) is composed.
  • a binder system consisting of one or more resin and hardener component (s) with or without additives and / or catalysts (n) is composed.
  • the first stage for filming and partial curing / partial crosslinking at temperatures ⁇ 150 ° C is performed.
  • a temperature / time regime is set to maintain the formability of the aluminum semi-finished products and / or components after the first stage for filming and partial curing / partial crosslinking of the layer.
  • the partial curing / partial crosslinking is carried out thermally and / or photochemically and / or radiation-chemically. It is also advantageous if the second stage for curing / crosslinking is carried out at temperatures> 130 ° C.
  • the second stage for curing / crosslinking during and / or after at least one forming process under the conditions of the recrystallization of the aluminum (alloy) is performed. It is also advantageous that the coated formed aluminum semi-finished products and / or components are coated with at least one further layer and filmed in the at least second stage and cured / crosslinked together with the first (paint) layer.
  • the essence of the invention consists in the production of coated shaped aluminum semi-finished products and components, according to the Aluminum semi-finished products are coated and filmed in a thermal process and teilgehärtei / partially crosslinked.
  • the partial hardening / partial crosslinking of the layer for example thermally and radiation-chemically or only thermally, has such a mechanical stability that these semi-finished products can be easily stored and further processed at a later time.
  • a corresponding temperature / time regime must be maintained in the first stage of filming and partial curing / partial crosslinking. The rule here is that shorter reaction times should be selected at higher temperatures.
  • the partial curing / partial crosslinking can be carried out by radiation chemistry.
  • the elasticity of the partially cured (partially) (paint) layer can be adjusted by criteria - firstly by the composition of the binder system and secondly by the degree of partial cure / partial crosslinking, which can be determined by DSC measurements.
  • the composition of the binder system in particular elastic structural elements can be integrated in the resin component.
  • the formed (paint) film is thereby during or after the forming process as a closed (paint) film before, which in particular additional process steps can be omitted.
  • further layers for example topcoats, cover or color layers or overlays, can be applied, which can also be cured / crosslinked in the second stage at temperatures greater than 130.degree.
  • the rigidity of the component is achieved.
  • the adhesion between the formable aluminum semi-finished products and components and the layer and between the layers is advantageously achieved in addition to the adhesive interaction by chemical bonds.
  • a further improved adhesion is achieved by forming covalent bonds. Partial curing / partial crosslinking of a layer leaves functional and / or reactive groups on the surface which form a covalent bond with the functional and / or reactive groups of a further layer.
  • the compounds (A) and (B) are homogenized at a melt temperature of 90 ° C. To this mass are successively added the compounds (E), (D) and (C).
  • the compositions of the example mixtures are given in Table 1.
  • the homogenized masses are quenched by introduction into liquid nitrogen. These masses are further processed in a (laboratory) grinding plant with sifter to a coating powder.
  • the coating powder is applied to an aluminum sheet by means of powder coating and filmed in a convection oven at 140 ° C, 15 minutes and partially cured / partially crosslinked. It has been determined by DSC measurements that no further reactions from uretdione to allophanate are detectable under isothermal measurement conditions. By deep drawing, the coated aluminum sheet is formed into a cup as a model component at room temperature. There were no cracks or layer damage and there was a closed coating film.
  • Example 1 in the tables is the comparative example analogous to commercial coating compositions, in which after the coating and partial curing / partial crosslinking, the semi-finished aluminum product is no longer reshapeable.

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)
  • Laminated Bodies (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (11)

  1. Ebauches et/ou composants en aluminium, façonnables et revêtus, revêtus par un agent de revêtement durcissable et/ou réticulable en au moins deux étapes et présentant la forme d'une pâte de revêtement fondue, d'un vernis en poudre, d'une dispersion de vernis ou d'un système à solvant et durci et/ou réticulé à une température d'au plus 150°C, le film de revêtement ainsi formé étant élastique, présentant la forme d'un film de revêtement essentiellement fermé pendant les opérations de façonnage ultérieures et présentant essentiellement la forme d'un film de revêtement durci et/ou réticulé dans une deuxième étape de réaction réalisée après une opération de façonnage, le durcissement et/ou la réticulation étant réalisés dans les conditions de cristallisation finale de l'aluminium ou de l'alliage d'aluminium.
  2. Ebauches et/ou composants en aluminium, façonnables et revêtus selon la revendication 1, qui présentent la forme de minces tôles d'aluminium, de tubes d'aluminium ou d'ébauches en sandwich d'aluminium sous forme de tôles ou de tubes en alliages d'aluminium ou en aluminium façonnables aptes à être façonnés à une température inférieure à 150°C.
  3. Ebauches et/ou composants en aluminium, façonnables et revêtus selon la revendication 1, revêtus complètement, en partie, sur une face, à l'intérieur ou à l'extérieur par le film de revêtement.
  4. Ebauches et/ou composants en aluminium, façonnables et revêtus selon la revendication 1, dans lesquels les ébauches et/ou composants revêtus en aluminium sont dotés d'au moins une autre couche.
  5. Ebauches et/ou composants en aluminium, façonnables et revêtus selon la revendication 1, dans lesquels l'adhérence est obtenue par des interactions adhésives et/ou par des liaisons chimiques, de préférence covalentes.
  6. Ebauches et/ou composants en aluminium, façonnables et revêtus selon la revendication 1, dans lesquels au moins l'un des agents de revêtement est constitué d'un système de liant constitué d'un ou plusieurs composants de résine ou de durcisseur avec ou sans additifs et/ou catalyseurs.
  7. Procédé de fabrication d'ébauches et/ou composants en aluminium, façonnables et revêtus selon la revendication 1, qui présentent la forme de minces tôles d'aluminium, composants en sandwich d'aluminium ou de tubes d'aluminium en alliage d'aluminium ou en aluminium façonnables revêtus par un agent de revêtement durcissable et/ou réticulable en au moins deux étapes et présentant la forme d'une pâte de revêtement fondue, d'un vernis en poudre, d'une dispersion de vernis ou d'un système à solvant, la ou les couches étant dans une première étape transformées en film et partiellement durcies et/ou partiellement réticulées à une température < 150°C et étant durcies et/ou réticulées dans au moins une deuxième étape réalisée pendant et/ou après au moins une opération de façonnage essentiellement dans les conditions de cristallisation finale de l'aluminium ou de l'alliage d'aluminium.
  8. Procédé selon la revendication 7, dans lequel pour obtenir la déformabilité des ébauches et/ou composants en aluminium, un régime de température en fonction du temps est établi après la première étape pour transformer la couche en film et lui permettre de durcir et/ou de réticuler partiellement.
  9. Procédé selon la revendication 7, dans lequel le durcissement partiel et/ou la réticulation partielle sont réalisés par voie thermique, photochimique et/ou chimique sous l'action d'un rayonnement.
  10. Procédé selon la revendication 7, dans lequel la deuxième étape de durcissement et/ou de réticulation est réalisée à une température > 130°C.
  11. Procédé selon la revendication 7, dans lequel les ébauches et/ou composants d'aluminium façonnés et revêtus sont revêtus d'au moins une autre couche qui est transformée en film dans la ou les deuxièmes étapes et durcie et/ou réticulée en même temps que la première couche (de vernis).
EP02719679A 2001-03-13 2002-03-12 Demi-produits et/ou elements en aluminium faconnes et enduits, et procede de fabrication associe Expired - Lifetime EP1372872B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10112991 2001-03-13
DE10112991 2001-03-13
PCT/DE2002/000924 WO2002072285A2 (fr) 2001-03-13 2002-03-12 Demi-produits et/ou elements en aluminium façonnes et enduits, et procede de fabrication associe

Publications (2)

Publication Number Publication Date
EP1372872A2 EP1372872A2 (fr) 2004-01-02
EP1372872B1 true EP1372872B1 (fr) 2008-07-02

Family

ID=7677893

Family Applications (1)

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EP02719679A Expired - Lifetime EP1372872B1 (fr) 2001-03-13 2002-03-12 Demi-produits et/ou elements en aluminium faconnes et enduits, et procede de fabrication associe

Country Status (9)

Country Link
US (1) US20040105972A1 (fr)
EP (1) EP1372872B1 (fr)
AT (1) ATE399602T1 (fr)
AU (1) AU2002250819A1 (fr)
CA (1) CA2440998A1 (fr)
DE (2) DE10211512B4 (fr)
DK (1) DK1372872T3 (fr)
ES (1) ES2309160T3 (fr)
WO (1) WO2002072285A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040967A1 (de) * 2008-08-04 2010-02-11 Leibniz-Institut Für Polymerforschung Dresden E.V. Werkstoff-Kunststoff-Verbunde und Verfahren zu ihrer Herstellung

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JPS5229349B2 (fr) * 1971-10-11 1977-08-01
US4032678A (en) * 1974-09-12 1977-06-28 Bethlehem Steel Corporation Coated sheet metal and method of forming products therefrom
US3942672A (en) * 1974-12-20 1976-03-09 The Goodyear Tire & Rubber Company Polyurethane composition and method of preparation
US4125670A (en) * 1975-08-11 1978-11-14 Bethlehem Steel Corporation Thermosetting organic coated metallic sheet
US4444975A (en) * 1983-08-03 1984-04-24 Minnesota Mining And Manufacturing Company Wire coating composition for restoration of polyethylene insulation
JPH0780984B2 (ja) * 1987-05-29 1995-08-30 武田薬品工業株式会社 プレコートメタル用一液性熱硬化型樹脂組成物
JP2788131B2 (ja) * 1991-01-29 1998-08-20 日本パーカライジング株式会社 アルミニウムまたはアルミニウム合金表面への複合皮膜形成方法
US5380792A (en) * 1993-04-19 1995-01-10 Miles Inc. Two-component aqueous polyurethane dispersions having improved pot life and coatings prepared therefrom
JPH07166125A (ja) * 1993-12-13 1995-06-27 Kobe Steel Ltd プレス成形性及び耐食性にすぐれる樹脂塗装アルミニウム又はアルミニウム合金材及びその製造方法
JPH09131568A (ja) * 1995-09-06 1997-05-20 Honda Motor Co Ltd 成形性、塗装焼付硬化性に優れた表面処理アルミニウム合金板およびその製造方法
DE19610465A1 (de) * 1996-03-16 1997-09-18 Huels Chemische Werke Ag Neue Polyadditionsverbindungen
US5789519A (en) * 1996-04-12 1998-08-04 Bayer Corporation High viscosity, high equivalent weight polyisocyanate mixtures containing allophanate and isocyanurate groups and their use in coating compositions
US5814137A (en) * 1996-11-04 1998-09-29 The Boeing Company Sol for coating metals
US5783652A (en) * 1997-11-04 1998-07-21 Bayer Corporation Reactivity improvement of urethane prepolymers of allophanate-modified diphenylmethane diisocyanates
DE19856877A1 (de) * 1998-12-10 2000-06-15 Inst Polymerforschung Dresden Härtbare Masse und Verfahren zu ihrer Herstellung und Verarbeitung
DE19856878A1 (de) * 1998-12-10 2000-06-15 Inst Polymerforschung Dresden Härtbare uretdiongruppenhaltige Massen und ein Verfahren zu ihrer Herstellung und Verarbeitung sowie ihre Verwendung
JP2001017915A (ja) * 1999-07-09 2001-01-23 Honda Motor Co Ltd 自動車の車体の塗装方法
DE10027265A1 (de) * 2000-06-02 2001-12-13 Basf Coatings Ag Mit farb- und/oder effektgebenden Mehrschichtlackierungen beschichtete Aluminium-Coils

Also Published As

Publication number Publication date
WO2002072285A3 (fr) 2003-06-26
EP1372872A2 (fr) 2004-01-02
DE10211512B4 (de) 2007-05-31
CA2440998A1 (fr) 2002-09-19
ATE399602T1 (de) 2008-07-15
DK1372872T3 (da) 2008-11-03
DE50212437D1 (de) 2008-08-14
US20040105972A1 (en) 2004-06-03
ES2309160T3 (es) 2008-12-16
WO2002072285A2 (fr) 2002-09-19
DE10211512A1 (de) 2003-01-02
AU2002250819A1 (en) 2002-09-24

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