EP0684877A1 - Surface coating process - Google Patents

Surface coating process

Info

Publication number
EP0684877A1
EP0684877A1 EP94908537A EP94908537A EP0684877A1 EP 0684877 A1 EP0684877 A1 EP 0684877A1 EP 94908537 A EP94908537 A EP 94908537A EP 94908537 A EP94908537 A EP 94908537A EP 0684877 A1 EP0684877 A1 EP 0684877A1
Authority
EP
European Patent Office
Prior art keywords
layer
paint
chlorine
free
foil
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Withdrawn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
EP94908537A
Other languages
German (de)
French (fr)
Inventor
Karl Lage Holmberg
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.)
Becker Industrifarg AB
Original Assignee
Becker Industrifarg AB
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 Becker Industrifarg AB filed Critical Becker Industrifarg AB
Publication of EP0684877A1 publication Critical patent/EP0684877A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0038—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving application of liquid to the layers prior to lamination, e.g. wet laminating
    • 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
    • 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
    • B05D2252/02—Sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/24—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/30—Iron, e.g. steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2327/00—Polyvinylhalogenides
    • B32B2327/12—Polyvinylhalogenides containing fluorine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2333/00—Polymers of unsaturated acids or derivatives thereof
    • B32B2333/04—Polymers of esters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2375/00—Polyureas; Polyurethanes

Definitions

  • the present invention relates to a continuous process for surface-coating of metal substrates with planar surfaces, such as coil or sheet materials, on a coil-coating line for provid ⁇ ing a durable and corrosion protecting coating on the metal surface.
  • the first layer is a paint material with adhesive properties.
  • suitable paint materials are polyester, vinyl or latex paints.
  • chlorine-free wet paint such as latex, polyester, fluo- rocarbon polymers, e.g. P F2, or polyurethane (PUR) is app ⁇ lied. Said wet paint is cured (dried) and cooled after appli ⁇ cation.
  • the paints are applied according to conventional techniques, such as roller coating, spray coating, curtain coating, etc.
  • the drying is also performed by conventional methods, such as IR-tubes, induction or convection heating.
  • the chlorine-free plastic sheet or foil is applied directly upon the hot paint surface.
  • the plastic sheet is applied directly upon the hot paint surface by lamination, e.g. using a pressure roller.
  • the second layer the chlorine-free plastic sheet or foil, has a thickness of from 10 to 300 ⁇ m.
  • the third layer, the pigmented, chlorine-free paint is app ⁇ lied to a thickness of from 10 to 150 ⁇ m dry film, preferably from 10 to 50 ⁇ m.
  • SUBSTITUTE SHEET As metal materials with generally planar surfaces which can be treated with the surface coating process according to the present invention the following may be mentioned: cold rolled steel, metallized steel, stainless steel, galvanized steel, aluminium, etc.
  • the sheet metal is preferably pretreated chemically by usual methods, such as pickling, phos ' phatizing, chromating, etc.
  • a water borne acrylic paint (68760-34, Coilon laqua from Becker IndustrifSrg, Sweden) is applied by reverse -roller coat to a thickness of 10-25 ⁇ m dry film, drying/curing at 180°C PMT (peak metal temperature).
  • Second layer Directly upon the previous hot layer a clear thermoplastic acrylic sheet (Korad from Polymer Extruded Produ ⁇ ts Inc., USA) and a thickness of 75 ⁇ m is applied by laminating roller and a pressure of 3.5 kp/cm .
  • an acrylic water borne top coat (EJ 644-9302, Coilon Acrylic latex from Becker Industrifarg AB, Sweden) is applied to a thickness of 20 ⁇ m dry film, by reverse roller coat, drying/curing at 180°C
  • Example 1 The same a ⁇ Example 1 with the following exception: Instead of hot galvanized steel, pretreated with "Bonder 1303" Alu-zinc coated steel is used.
  • Example 1 The same as Example 1 with the following exception: As third layer is used a polyester 'top coat (DJ216, Coilon polyester from Becker Industrifarg, Sweden) instead of EJ644.
  • DJ216 Coilon polyester from Becker Industrifarg, Sweden

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A continuous process for surface coating of metal substrates on a coil coating line is described wherein as a first layer a paint material with adhesive properties is applied and dried and directly upon the hot paint surface of the first layer a clear, chlorine-free plastic sheet or foil is applied and cooled and on the cool plastic sheet or foil a pigmented, chlorine-free paint is applied and cured.

Description

SURFACE COATING PROCESS
The present invention relates to a continuous process for surface-coating of metal substrates with planar surfaces, such as coil or sheet materials, on a coil-coating line for provid¬ ing a durable and corrosion protecting coating on the metal surface.
The first layer is a paint material with adhesive properties. Examples of such suitable paint materials are polyester, vinyl or latex paints.
After this first paint layer has been applied and dried a clear chlorine-free plastic sheet or foil of acrylic plastic, polyester or a similar polymer is applied directly upon the hot paint surface and then cooled.
As/a third layer on the cooled plastic sheet or foil a pig en- ted, chlorine-free wet paint, such as latex, polyester, fluo- rocarbon polymers, e.g. P F2, or polyurethane (PUR) is app¬ lied. Said wet paint is cured (dried) and cooled after appli¬ cation.
The paints are applied according to conventional techniques, such as roller coating, spray coating, curtain coating, etc. The drying is also performed by conventional methods, such as IR-tubes, induction or convection heating.
After the first paint layer has been dried to a state of a certain degree of thermoplasticity the chlorine-free plastic sheet or foil is applied directly upon the hot paint surface. The plastic sheet is applied directly upon the hot paint surface by lamination, e.g. using a pressure roller.
By means of the process according to the present invention a three layered surface coating is obtained which provides a very good corrosion protection to the metal substrate.
The second layer, the chlorine-free plastic sheet or foil, has a thickness of from 10 to 300 μm.
The third layer, the pigmented, chlorine-free paint, is app¬ lied to a thickness of from 10 to 150 μm dry film, preferably from 10 to 50 μm.
It is previously known to treat metal sheeting, e.g. coming from a coil, by painting with a/primer layer and by applying a top coat on top of the primer layer. However, only a limited degree of corrosion resistance of the so-coated metal sheet is thereby obtained owing to a certain porosity in the coating layer materials.
It is also previousJy known to treat the surface of e.g. metal sheet by first applying an adhesive layer and then applying a plastic sheet. Even in this case, a limited corrosion resis¬ tance is obtained owing to the fact that the adhesive layer is so thin.
Furthermore, it is previously known from EP 0 233 179 to use PVC-plastisols as layers on metal sheet and also PVC-foils as the uppermost layer. However, this gives rise to pollution problems when chlorinated materials are broken down either in service or when recycled, and also gives rise to an impaired bonding of the total coating to the underlaying metal sub¬ strate over time owing to migration of plasticizers such aε phthalates to the interface between the metal substrate and the coating.
SUBSTITUTE SHEET As metal materials with generally planar surfaces which can be treated with the surface coating process according to the present invention the following may be mentioned: cold rolled steel, metallized steel, stainless steel, galvanized steel, aluminium, etc.
In the coating of sheet metal materials, the sheet metal is preferably pretreated chemically by usual methods, such as pickling, phos'phatizing, chromating, etc.
The invention is illustrated by means of the following Examples:
Example 1
In a conventional coil coating line the following is applied on 0.8 mm hot galvanized steel, chemically pretreated with Bonder 1303 (a phosphatizing agent from Metallgesellschaft GmbH, Germany).
First layer: A water borne acrylic paint (68760-34, Coilon laqua from Becker IndustrifSrg, Sweden) is applied by reverse -roller coat to a thickness of 10-25 μm dry film, drying/curing at 180°C PMT (peak metal temperature).
Second layer: Directly upon the previous hot layer a clear thermoplastic acrylic sheet (Korad from Polymer Extruded Produσts Inc., USA) and a thickness of 75 μm is applied by laminating roller and a pressure of 3.5 kp/cm .
Third layer: After the second layer has been cooled an acrylic water borne top coat (EJ 644-9302, Coilon Acrylic latex from Becker Industrifarg AB, Sweden) is applied to a thickness of 20 μm dry film, by reverse roller coat, drying/curing at 180°C
PMT.
SUBSTJTUTESHEET Example 2
The same aε Example 1 with the following exception: Instead of hot galvanized steel, pretreated with "Bonder 1303" Alu-zinc coated steel is used.
Example 3
The same as Example 1 with the following exception: As third layer is used a polyester 'top coat (DJ216, Coilon polyester from Becker Industrifarg, Sweden) instead of EJ644.
SUBSTITUTE SHEET

Claims

1. A continuous process for surface coating a generally planar metal surface of a sheet or coil in a coil coating line, com¬ prising the steps of: applying as a first layer a paint material with adhesive properties and drying said first layer; applying directly upon the hot paint surface of the first layer a clear, chlorine-free plastic sheet or foil and cooling; applying as a third layer on the cool plastic sheet or foil a pigmented, chlorine-free paint and curing.
2. A process according to Claim 1, c h a r a c t e r i z e d in that the chlorine- free plastic sheet or foil is an acrylic plastic.
3. A process according to Claim 1, c h a r a c t e r i z e d in that the chlorine- free plastic sheet or foil is a poly¬ ester .
4. A process according to any of Claims 1-3, c h a r a c - t e r i z e d in that the chlorine- free paint used as the first layer is a latex paint.
5. A process according to any of Claims 1-3, c h a r a c - t e r i z e d in that the chlorine- free paint in the third layer is a polyester.
6. A process accoring to any of the preceding claims, c h a r a c t e r i z e d in that the chlorine- free plastic sheet or foil used as the second layer has a thickness of from 10 to 300 μm.
7. A process according to any of the preceding claims, c h a r a c t e r i z e d in that the paint used as the third layer is applied to a thickness of from 10 to 150 μm dry film.
SUBSTITUTE SHEET
EP94908537A 1993-02-19 1994-02-10 Surface coating process Withdrawn EP0684877A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9300562A SE500931C2 (en) 1993-02-19 1993-02-19 A process for coating a metal surface in three steps, including coating with a chlorine-free plastisol
SE9300562 1993-02-19
PCT/SE1994/000111 WO1994019113A1 (en) 1993-02-19 1994-02-10 Surface coating process

Publications (1)

Publication Number Publication Date
EP0684877A1 true EP0684877A1 (en) 1995-12-06

Family

ID=20388961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94908537A Withdrawn EP0684877A1 (en) 1993-02-19 1994-02-10 Surface coating process

Country Status (6)

Country Link
EP (1) EP0684877A1 (en)
JP (1) JPH08506759A (en)
CN (1) CN1118148A (en)
CA (1) CA2154682A1 (en)
SE (1) SE500931C2 (en)
WO (1) WO1994019113A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1269757B (en) * 1994-05-12 1997-04-15 Siquam Spa PROCEDURE FOR MULTILAYER COATING OF METAL SHEET TAPES IN ROLL OR SHEETS AND PRODUCT SO OBTAINED
DE4424299A1 (en) * 1994-07-09 1996-01-11 Basf Lacke & Farben Multi-layer coated substrates and process for making these substrates
CN108277496A (en) * 2017-12-22 2018-07-13 尼尔金属(苏州)有限公司 A method of locally making organic coating on tin plating aluminum metal coiled material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9419113A1 *

Also Published As

Publication number Publication date
SE500931C2 (en) 1994-10-03
WO1994019113A1 (en) 1994-09-01
CA2154682A1 (en) 1994-09-01
SE9300562D0 (en) 1993-02-19
SE9300562L (en) 1994-08-20
JPH08506759A (en) 1996-07-23
CN1118148A (en) 1996-03-06

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