EP0684878A1 - Coil coating process - Google Patents

Coil coating process

Info

Publication number
EP0684878A1
EP0684878A1 EP94908538A EP94908538A EP0684878A1 EP 0684878 A1 EP0684878 A1 EP 0684878A1 EP 94908538 A EP94908538 A EP 94908538A EP 94908538 A EP94908538 A EP 94908538A EP 0684878 A1 EP0684878 A1 EP 0684878A1
Authority
EP
European Patent Office
Prior art keywords
plastic sheet
layer
coating
free
sheet
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Withdrawn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
EP94908538A
Other languages
German (de)
French (fr)
Inventor
Gerulf Naglitsch
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 EP0684878A1 publication Critical patent/EP0684878A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B05D7/542—No clear coat specified the two layers being cured or baked together
    • 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
    • B05D7/57—Three layers or more the last layer being a clear coat
    • 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
    • B32B15/04—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
    • B32B15/09—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 polyesters
    • 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
    • B32B15/095—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 polyurethanes
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • 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
    • 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
    • B32B2363/00—Epoxy 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
    • 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 invention relates to a continuous process for surface coating a of metal substrates having a generally planar surface, on a coil-coating line for providing a durable and corrosion protecting coating on the metal surface.
  • paint- and lacquer materials are applied in two layers on the metal substrate with generally planar surface. These layers are applied as wet paint layers, which in dried state will have a certain degree of thermoplasticity.
  • the first layer is a chlorine-free primer coat, such as e.g. an acrylic, epoxy or polyester coat.
  • a chlorine-free, plastisol of an acrylic resin or of a polyester is applied as a paint layer.
  • Said such wet paint layer is dried after application and has in the dried condition a certain degree of thermoplasticity.
  • 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.
  • a chlorine-free plastic sheet or foil is applied directly upon the hot paint surface.
  • the plastic sheets applied directly upon the hot paint surface by lamination, e.g. using a pressure roller, are made of various suitable pore-free, and chlorine-free foil materials, such as sheets of fluorocarbon polymers, e.g. PVF, PVF 2 , of acrylic resins, of polyesters or of polyurethanes.
  • the plastic sheet and the second coat material together with the primer coat build up a barrier which provides a very good corrosion protection to the metal substrate and the total thickness of the primer and the second coat should be from ' 40 to 300 microns.
  • a surface coating with extraordinary hardness and wear resistance is obtained which provides an extraordinary corrosion protection to the underlying substrate material.
  • the sheet metal is preferably pretreated chemically by usual methods such as pickling, phosphatizing, chromating etc.
  • the layers of paint- and lacquer material consist of one primer layer and a second paint layer which can be pigmented or unpigmented.
  • the temperature of the metal sheet is from 150 up to 300 ⁇ C.
  • First layer An epoxy primer ("KE 215-1003 Coilon primer” from Becker Industrifarg AB, Marsta, Sweden) is applied by reverse roller coat to a thickness of 6-8 microns dry film, drying/curing at 225°C PMT (peak metal temperature) and cooled.
  • Second layer On the previous layer an acrylic plastisol (68815-12 Coilon Plastisol from Becker Industrifarg AB, Marsta, Sweden) is applied to a thickness of 80 microns dry film. By reverse roller coat, drying/curing at 240°C PMT.
  • Third layer Directly upon the previous hot layer, a plastic sheet of acrylic resin (Korad 73002 from Polymer Extruded Products” Inc. newark N.J. USA) and a thickness of 50 microns is applied.
  • a coating is obtained which provides excellent corrosion protection, high hardness and excellent wear resistance.
  • Alu-zink coated steel is used.
  • an epoxy primer (KE216-1003 from Becker Industrifarg AB, Marsta, Sweden), instead of KE215-1003.
  • a coating is obtained which provides excellent corrosion protection, high hardness and excellent wear resistance.
  • a coating is obtained which provides excellent corrosion protection, high hardness and excellent wear resistance.

Abstract

A process for surface coating of plane surfaces in which on the material with plane surface chlorine-free paint- and lacquer materials is applied as wet paint in two layers, each layer being dried separately before the application of the next layer and where the total plane layer thickness is 40-300 microns, and then a plastic sheet is applied by lamination directly on top of the hot paint surface.

Description

COIL COftTING PROCESS
The invention relates to a continuous process for surface coating a of metal substrates having a generally planar surface, on a coil-coating line for providing a durable and corrosion protecting coating on the metal surface.
In the process paint- and lacquer materials are applied in two layers on the metal substrate with generally planar surface. These layers are applied as wet paint layers, which in dried state will have a certain degree of thermoplasticity.
The first layer is a chlorine-free primer coat, such as e.g. an acrylic, epoxy or polyester coat.
As the second layer on the primer coat, a chlorine-free, plastisol of an acrylic resin or of a polyester is applied as a paint layer. Said such wet paint layer is dried after application and has in the dried condition a certain degree of thermoplasticity.
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 paint layers have been dried to a state of a certain degree of thermoplasticity, a chlorine-free plastic sheet or foil is applied directly upon the hot paint surface. The plastic sheets applied directly upon the hot paint surface by lamination, e.g. using a pressure roller, are made of various suitable pore-free, and chlorine-free foil materials, such as sheets of fluorocarbon polymers, e.g. PVF, PVF2, of acrylic resins, of polyesters or of polyurethanes.
The plastic sheet and the second coat material together with the primer coat, build up a barrier which provides a very good corrosion protection to the metal substrate and the total thickness of the primer and the second coat should be from' 40 to 300 microns. Thus, by the surface coating process according to the invention, a surface coating with extraordinary hardness and wear resistance is obtained which provides an extraordinary corrosion protection to the underlying substrate material.
It is previously known to treat metal sheeting, e.g. coming from a coil, by painting with a primer layer and by applying a topcoat on top of the primer layer. However, only a limited degree of corrosion resistance of the so-coated metal sheet is thereby obtained, due to a certain porosity in the coating layer materials.
It is also previously known to treat the surface of e.g. metal sheet by first applying an adhesive layer of 5-10 microns -and then applying a plastic sheet. Even in this case, a limited corrosion resistance is obtained owing to the fact that adhesive layer is so thin.
Furthermore, it is previously "known from EP 0.233.-179 to use PVC-plastisols as layers on metal sheets 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 underlying metal substrate over time owing to migration of plasticizers such as phthalates to the interface between the metal substrate and the coating. As metal materials with generally planar surfaces which can be treated with the surface coating process according to the present invention, such materials as cold rolled steel, metallized steel, stainless steel, galvanized steel, aluminium, etc. are suitable.
In the coating of sheet metal materials, the sheet metal is preferably pretreated chemically by usual methods such as pickling, phosphatizing, chromating etc.
The layers of paint- and lacquer material consist of one primer layer and a second paint layer which can be pigmented or unpigmented.
In said lamination the temperature of the metal sheet is from 150 up to 300βC.
In the process according to the invention a lamination without the use of any special adhesive is attained in one and the same process which gives a wear and corrosion resistant coating firmly bonded to the metal substrate by means of the second paint layer and first primer layer.
The invention is more closely illustrated in the following examples:
Example 1
In a conventional co'il coating line the following is applied on 0.8 mm hot galvanized steel, chemically pretreated with "Bonder 1303" (a phosphatising agent from Metallgesellschaft GmbH, Germany);
First layer: An epoxy primer ("KE 215-1003 Coilon primer" from Becker Industrifarg AB, Marsta, Sweden) is applied by reverse roller coat to a thickness of 6-8 microns dry film, drying/curing at 225°C PMT (peak metal temperature) and cooled. Second layer: On the previous layer an acrylic plastisol (68815-12 Coilon Plastisol from Becker Industrifarg AB, Marsta, Sweden) is applied to a thickness of 80 microns dry film. By reverse roller coat, drying/curing at 240°C PMT.
Third layer: Directly upon the previous hot layer, a plastic sheet of acrylic resin (Korad 73002 from Polymer Extruded Products" Inc. newark N.J. USA) and a thickness of 50 microns is applied.
A coating is obtained which provides excellent corrosion protection, high hardness and excellent wear resistance.
Example 2
The same as Example 1 with following exceptions:
Instead of hot galvanized steel, pretreated with "Bonder 1303", Alu-zink coated steel is used. As first layer is used an epoxy primer (KE216-1003 from Becker Industrifarg AB, Marsta, Sweden), instead of KE215-1003.
A coating is obtained which provides excellent corrosion protection, high hardness and excellent wear resistance.
Example 3
The same as Example 1 with the following exception:
As third Tayer is used a plastic sheet of polyester resin (Hostaphan RNH 50 from Hoechst Aktiengesellschaft Germany) instead of Korad.
A coating is obtained which provides excellent corrosion protection, high hardness and excellent wear resistance.

Claims

1. A continuous process for surface coating a generally planar metal surface of a sheet or coil in a coil coating line, comprising the steps of: applying a chlorine-free primer first coat onto a generally planar metal surface of a sheet and drying said primer coat; applying a layer of polymer-containing wet paint as a second coat; drying said wet paint second coat by application of heat to a state of a certain degree of thermoplasticity to provide a barrier coating above said metal surface of thickness from 40 to 300 microns; applying a pore-free plastic sheet directly on top of said still hot paint coating and laminating, thereby forming a wear resistant and corrosion resistant coating, characterized in that as the second layer a chlorine-free plastisol of an acrylic resin or of a polyester is applied and as the pore-free plastic sheet a chlorine-free plastic sheet or foil of an acrylic resin, a fluoropolymer, a polyester or a polyurethane is applied.
2. A process according to claim 1, characterized in that the polymer resin in the second layer is an acrylate resin.
3. A process according to claim 1 or 2, characterized in that the plastic sheet or- foil is a sheet or foil of an acrylate resin.
4. A process according to any of claims 1-3, characterized in that the plastisol applied as the second layer contains a pigment and the plastic sheet is a clear plastic sheet.
5. A process according to any of claims 1-3, characterized in that the plastic sheet is pigmented.
EP94908538A 1993-02-19 1994-02-10 Coil coating process Withdrawn EP0684878A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9300563A SE500930C2 (en) 1993-02-19 1993-02-19 A method for coating a metal surface comprising coating with a chlorine-free plastisol
SE9300563 1993-06-23
PCT/SE1994/000112 WO1994019114A1 (en) 1993-02-19 1994-02-10 Coil coating process

Publications (1)

Publication Number Publication Date
EP0684878A1 true EP0684878A1 (en) 1995-12-06

Family

ID=20388962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94908538A Withdrawn EP0684878A1 (en) 1993-02-19 1994-02-10 Coil coating process

Country Status (6)

Country Link
EP (1) EP0684878A1 (en)
JP (1) JPH08506760A (en)
CN (1) CN1118147A (en)
CA (1) CA2154785A1 (en)
SE (1) SE500930C2 (en)
WO (1) WO1994019114A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7141303B2 (en) 2001-03-06 2006-11-28 3M Innovative Properties Company Protective articles
NL2025038B1 (en) 2020-03-03 2021-10-14 Lamcoatings B V Coil coating process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9419114A1 *

Also Published As

Publication number Publication date
SE9300563L (en) 1994-08-20
SE9300563D0 (en) 1993-02-19
SE500930C2 (en) 1994-10-03
JPH08506760A (en) 1996-07-23
WO1994019114A1 (en) 1994-09-01
CN1118147A (en) 1996-03-06
CA2154785A1 (en) 1994-09-01

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