EP0968060B1 - Procede pour generer des surfaces structurees dans une enduction en continu de bandes - Google Patents

Procede pour generer des surfaces structurees dans une enduction en continu de bandes Download PDF

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Publication number
EP0968060B1
EP0968060B1 EP98906902A EP98906902A EP0968060B1 EP 0968060 B1 EP0968060 B1 EP 0968060B1 EP 98906902 A EP98906902 A EP 98906902A EP 98906902 A EP98906902 A EP 98906902A EP 0968060 B1 EP0968060 B1 EP 0968060B1
Authority
EP
European Patent Office
Prior art keywords
paint
coating
coil coating
roll
substrate
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
EP98906902A
Other languages
German (de)
English (en)
Other versions
EP0968060A1 (fr
Inventor
Wilfried Heinz Heindrichs
Dirk Lange
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.)
Sigma Coatings Farben und Lackwerke GmbH
Original Assignee
Sigma Coatings Farben und Lackwerke GmbH
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 Sigma Coatings Farben und Lackwerke GmbH filed Critical Sigma Coatings Farben und Lackwerke GmbH
Priority to EP98906902A priority Critical patent/EP0968060B1/fr
Priority claimed from PCT/EP1998/000541 external-priority patent/WO1998033601A1/fr
Publication of EP0968060A1 publication Critical patent/EP0968060A1/fr
Application granted granted Critical
Publication of EP0968060B1 publication Critical patent/EP0968060B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/061—Special surface effect

Definitions

  • This invention relates to the generation of structured surfaces in coil coating. More particularly, the invention relates to a physical method for generating structured surfaces using coil coating.
  • EP-A-47508 to SCHRAMM Lacke discloses the use of a finely divided polyamide suspended in a thermosetting paint with a hydroxy-functional binder and a blocked polyisocyanate.
  • EP-A-288294 to BASF Lacke + discloses the use of 0.01 to 0.05 wt% of polyethylene wax having a softening point of 100-120°C and a particle size of 5-35 um in the primer of certain polyester systems to obtain a structured finish.
  • the state of the art technology has many drawbacks.
  • the main drawback is that changing the pattern of the structure requires changing the composition of the paint.
  • raw materials variability makes it difficult to reproduce the same structure from batch to batch.
  • the structure pattern can in many cases be different in the web direction and in the transverse direction. Further, the systems based on the creation of an incompatibility are inherently subject to storage stability problems.
  • US-A-5,565,260 discloses a method for applying polymer resin having a solids content of at least about 50 wt vol% with a coating roll having grooves in its surface.
  • US-A-3,207,617 discloses a method for painting an embossed pattern on individual sheets of plywood, hardboard and the like, comprising applying a coat of liquid paint, mixing sand with said paint, and rolling a grooved roller to provide an embossed pattern.
  • FR-A-2,289,353 discloses a process for making an embossed coating on a substrate, wherein means for embossing are applied on a coating of a composition having a viscosity of 20 to 1,000 poises (dPa.s) whilst said coating in drying.
  • GB-1,512,967 discloses a process for making a decorative relief finish on a substrate such as a wall, using a pressing roll made of polyvinyl alcohol or polyvinyl acetal.
  • the materials used to form the coatings are conventionally used in the building art to form thick films; exemplified materials have viscosities of 150 and 480 poise (dPa.s).
  • EP-A-79,759 discloses a method for providing surface replication in a coating on a sheet of material, wherein the coated sheet is at least partially set while it is pressed against a replicative surface. Such a process could not be adapted to coil coating because the continuous sheet must pass horizontally in the ovens.
  • a further object of the invention is to provide a process for generating structured surfaces in coil coating that will not create paint storage stability problems.
  • the process of the invention for generating a structured surface in coil coating comprises the successive steps of:
  • Coil coating is a continuous coating process of metal coils.
  • the metal is generally steel, galvanised steel or aluminium.
  • the coating is applied continuously on the metal moving at high speed, using roller or spraying applications and dried or cured by passing in a heated oven.
  • the process involves metal pretreatment (such as degreasing, brushing, rinsing and chemical treatment, as may be required or desired) followed by the application and heating of two layers of coating (generally a primer and a topcoat).
  • the coated metal can then be cut and given its final shape.
  • Description of the coil coating process can be found in many textbooks, e.g. in "Organic Coatings : Science and Technology", vol.II, pages 290-5, Wicks et al., eds., Wiley, 1994.
  • the process of the invention can be applied to the primer and/or to the topcoat (or to any intermediate coat).
  • a primer is structured, it is known that it can be overcoated with a topcoat which essentially retains the structure imparted to the primer coat.
  • the wet layer of paint can be applied by any means used or useable in coil coating, such as bar coating, roller coating, curtain coating or extrusion.
  • the wet film usually has a thickness of from 5 to 60 um; for primers the wet film thickness is preferably of about 20 ⁇ m, while for topcoats it is preferably of about 50 ⁇ m.
  • the invention is applicable to any type of paint that can be used in coil coating, be it of the heat curing or of the heat drying type.
  • binders there can be cited epoxy resins, polyesters, polyurethanes, polyesterurethanes, silicone-polyesters, PVC plastisols and organosols, polyvinylidene fluoride (PVdF) homo- or copolymers, and hybrid formulations as well as mixtures. Paint formulation in coil coating is known in the art and need not be described herein.
  • the paint properties (such as the thixotropy, the viscosity, the curing reaction) need to be adapted to the specific operating conditions.
  • the viscosity of the paint is typically in the range of 30 to 200 s (as measured with a DIN 4 cup; DIN 53211 standard method), preferably 50 to 150 s, more preferably 60 to 120 s.
  • the heating step of the coated substrate to cure the paint is well known in the art; more particularly, one of ordinary skill in the art knows how to adapt the heating conditions.
  • the wet layer of paint is passed under a roll having a raised pattern on its surface in order to impart a structure to the wet layer before heating it to cure the paint.
  • the roll may be made of any material, such as steel, stainless steel, brass, rubber, or it may even comprise a rubber coating on a metal roll.
  • the diameter of the roll is easily adapted to the linear speed of the coil; the diameter is typically of from 10 to 2000 mm.
  • the raised pattern may be regular or irregular; any pattern design may be used. Typical dimensions are in the range of from 0.2 to 100 mm for the pattern unit and independently from 0.1 to 50 mm for each of the raised and hollow parts of the pattern.
  • One of the advantages of the invention over the prior art is that it allows to obtain patterns of practically any unit size, whereas the prior art only provides small unit sizes (lower than 1 mm).
  • the depth of the pattern can be of from 0.01 to 10 mm, depending on the desired structure.
  • the distance between the surface of the raised pattern and the adjacent surface of the substrate is adapted to the desired depth of the structure, with the usual accuracy required in coil coating.
  • the structure created in the wet layer of paint is fixed by the curing process in the heating step.
  • Said heating step must follow within a short period of time, which essentially depends on the viscosity and thixotropy of the wet paint; the speed of the coil in the process of the invention being of at least 60 m/min, preferably at least 80 m/min, there is no difficulty in placing the roll sufficiently close to the location where the paint will be cured, so that the paint viscosities and thixotropies usual in coil coating can be used.
  • the invention is thus suitable for all standard primer, intermediate and top coating compositions that can be used in coil coating.
  • the process of the invention provides a coil coating system which is simple to use and does not require any modification of the composition of the paints.
  • the pattern of the structure can be varied practically at will and without interfering with the properties of the coating, what is impossible when varying the composition of the paints.
  • a coil coating apparatus essentially comprises the following elements, in that order : a decoiler, a stitching or welding unit, an entry accumulator, a pretreatment zone, a first coating unit followed by an oven, a second coating unit followed by an oven, an exit accumulator, and a recoiling or shearing and stacking equipment.
  • the present invention also provides a coil coating apparatus characterised in that it comprises, between a coating unit and the oven following it, a roll having a raised pattern on its surface that is adapted to impart a structure to the wet layer of coating before it is heated.
  • This invention provides the first opportunity to adjust in a coil coating process the general image of the structure pattern, the dimension of the unit of a repeated motive and the slope of each single motive.
  • the substrates were zinc plated steel with Bonder 1303 pre-treatment at thicknesses of 0.5 mm.
  • a 20 um thick wet layer of primer was applied on the substrate.
  • a steel roll (R1) having a diameter of 20 mm was covered with a rubber sheet with a raised pattern consisting of hexagones in a compact geometrical arrangement; the pattern unit dimension was of 0.9 mm, and the depth of the pattern was of 2 mm.
  • the roll (R1) was rolled over the wet layer of paint which then passed in an oven; it took 35 s to reach the peak metal temperature (PMT) of 230°C.
  • the structure imparted by the roll (R1) to the paint was preserved in the dry coating.
  • topcoat (P2) heat-curing polyesterurethane topcoat; saturated polyester 24.7 wt% (dry matter) hexamethoxymethylmelamine 05.0 wt% catalyst 00.3 wt% pigments 30.0 wt% solvents 37.2 wt% additives 02.8 wt% paint viscosity: 95 s
  • the twice coated substrate was then passed in an oven at a PMT of 240°C.
  • the structure imparted to the primer layer was retained by the topcoat layer.
  • Example 1 was repeated up to after passing the roll (R1) over the wet layer of primer. At room temperature, the structure imparted to the wet paint remained stable for about two minutes and disappeared after about ten minutes.
  • the substrate was coated with a base layer of the paint described in example under the denomination P2, which was then cured at a PMT of 240°C.
  • the dry layer thickness was of 10 um.
  • the first layer was then overcoated with a 30 um thick wet layer of a topcoat having the following composition: (P3) heat-curing polyesterurethane topcoat: saturated hydroxyfunctional polyester 23.3 wt% (dry matter) ketoxime-blocked isocyanace 02.0 wt% (11.5 % NCO) catalyst 01.1 wt% pigments 31.2 wt% additives 08.9 wt% solvents 33.5 wt% paint viscosity: 105 s

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)

Claims (6)

  1. Procédé pour générer une surface structurée dans une enduction sur bande, comprenant les étapes consistant à :
    (a) appliquer une couche humide de peinture sur un substrat ; et
    (b) chauffer le substrat ainsi enduit pour former un enduit ayant une surface structurée ;
    caractérisé en ce que la peinture a une viscosité de 30 à 200 s (mesurée avec une coupe DIN 4 en utilisant la méthode standard DIN 53211), le substrat se déplace à une vitesse d'au moins 60 m/min et le procédé comprend l'étape supplémentaire consistant à faire passer la couche humide de peinture sous un rouleau ayant un motif en relief sur sa surface, lequel confère une structure à la couche humide avant que le substrat enduit ne soit chauffé.
  2. Procédé selon la revendication 1, dans lequel la peinture est séchée au cours de l'étape de chauffage.
  3. Procédé selon la revendication 1, dans lequel la peinture est du type thermodurcissable et est durcie à la chaleur au cours de l'étape de chauffage.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel la peinture a une viscosité de 60 à 120 s.
  5. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel le substrat se déplace à une vitesse d'au moins 80 m/min.
  6. Appareil d'enduction sur bande, ayant une unité d'enduction avec un rouleau d'enduction et un four, caractérisé en ce qu'il comprend, entre l'unité d'enduction et le four qui la suit, un rouleau ayant un motif en relief sur sa surface, qui est adapté pour conférer une structure à la couche humide d'enduction avant qu'elle ne soit chauffée.
EP98906902A 1997-01-31 1998-02-02 Procede pour generer des surfaces structurees dans une enduction en continu de bandes Expired - Lifetime EP0968060B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98906902A EP0968060B1 (fr) 1997-01-31 1998-02-02 Procede pour generer des surfaces structurees dans une enduction en continu de bandes

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP97101538 1997-01-31
EP97101538 1997-01-31
PCT/EP1998/000541 WO1998033601A1 (fr) 1997-01-31 1998-02-02 Procede pour generer des surfaces structurees dans une enduction en continu de bandes
EP98906902A EP0968060B1 (fr) 1997-01-31 1998-02-02 Procede pour generer des surfaces structurees dans une enduction en continu de bandes

Publications (2)

Publication Number Publication Date
EP0968060A1 EP0968060A1 (fr) 2000-01-05
EP0968060B1 true EP0968060B1 (fr) 2003-04-23

Family

ID=26145200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98906902A Expired - Lifetime EP0968060B1 (fr) 1997-01-31 1998-02-02 Procede pour generer des surfaces structurees dans une enduction en continu de bandes

Country Status (3)

Country Link
EP (1) EP0968060B1 (fr)
AT (1) ATE238108T1 (fr)
DE (1) DE69813786T2 (fr)

Also Published As

Publication number Publication date
DE69813786T2 (de) 2004-01-29
DE69813786D1 (de) 2003-05-28
ATE238108T1 (de) 2003-05-15
EP0968060A1 (fr) 2000-01-05

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