EP0476539B1 - Procédé pour appliquer des revêtements en poudre sur des surfaces métalliques - Google Patents

Procédé pour appliquer des revêtements en poudre sur des surfaces métalliques Download PDF

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Publication number
EP0476539B1
EP0476539B1 EP19910115563 EP91115563A EP0476539B1 EP 0476539 B1 EP0476539 B1 EP 0476539B1 EP 19910115563 EP19910115563 EP 19910115563 EP 91115563 A EP91115563 A EP 91115563A EP 0476539 B1 EP0476539 B1 EP 0476539B1
Authority
EP
European Patent Office
Prior art keywords
oil
powder
powder layer
layer
heating
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
EP19910115563
Other languages
German (de)
English (en)
Other versions
EP0476539A3 (en
EP0476539A2 (fr
Inventor
Ulrich Bohnacker
Thomas Probst
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.)
ULRICH BOHNACKER
Original Assignee
Tegometall Rudolf Bohnacker
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 Tegometall Rudolf Bohnacker filed Critical Tegometall Rudolf Bohnacker
Publication of EP0476539A2 publication Critical patent/EP0476539A2/fr
Publication of EP0476539A3 publication Critical patent/EP0476539A3/de
Application granted granted Critical
Publication of EP0476539B1 publication Critical patent/EP0476539B1/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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • B05D7/14—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 to metal, e.g. car bodies
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials

Definitions

  • the invention relates to a method for powder coating of metal surfaces according to the preamble of claim 1.
  • Such methods are used, for example, for coating metal parts in vehicle construction, in mechanical engineering, in housings for household and other devices, for metal furniture and shelves or for toys.
  • the sheet In the manufacture of these metal parts, it is usually assumed that the sheet is wound as a "coil", which is oiled, painted or coated in another way to protect it from corrosion during transport and storage ("coil coating").
  • the sheet is unwound from the coil and processed into the desired product by sawing, punching, drilling, folding and edging.
  • the oil or paint coating also serves as a lubricant and release agent between the tool and the workpiece (sheet metal).
  • an oiled coil is assumed, it is then painted or coated to protect against corrosion and to give the parts the desired color.
  • a solvent-based paint is used for wet painting.
  • the evaporation of the solvent is usually associated with a significant environmental impact. This can be avoided when using an electrostatic powder coating process.
  • Electrostatically charged powder is sprayed onto the surface to be coated, where it adheres due to the electrostatic attraction.
  • Suitable powders are, for example, polyester or epoxy resins or a mixture thereof.
  • the powder layer is melted to a viscous mass by heating adheres well to the metal and results in a smooth surface.
  • the coating hardens on cooling.
  • edges of the sawn, punched or drilled metal parts are not coated and are therefore susceptible to rust. There is also a considerable risk of injury when handling these sharp-edged parts.
  • An enamel coating method is known from US Pat. No. 4,746,533, in which a ceramic enamel powder is applied to a metal surface provided with an oil film and is then fired at a very high temperature. The oil film evaporates completely at the high firing temperature.
  • JP-A-63-227 324 discloses a method for producing a plastic part by means of a shaped body.
  • the molded body is first coated with a silicone oil and then with a synthetic resin solution.
  • the plastic part is obtained after evaporating the solvent and separating the dried synthetic resin from the molded body, the silicone oil acting as a separating agent.
  • the powder coating method according to the invention is based on an oiled metal surface.
  • the powder is applied directly to the oil film. There is therefore no need to deoil the metal part to be coated.
  • the invention makes it possible to coat iron materials which are provided with an oil film as corrosion protection and as a lubricant in mechanical processing steps. Since removal of the oil film is not necessary, the process is inexpensive to use and environmentally friendly.
  • the method according to the invention is suitable both for coating semi-finished products, for example unprocessed flat material or coils, and for coating parts that have already been completely mechanically processed.
  • the latter case is preferable if, for reasons of corrosion protection and to avoid a possible risk of injury, no uncoated edges should remain.
  • the method can be applied to all metals and steel types and is also suitable for parts of any shape, for example also for profiles or pipes.
  • an oil is used according to claim 3, which is stable during the heating process, as long as it remains on the surface. This includes the possibility that individual components or all of the oil diffuse and evaporate during the heating process through the powder layer or that parts or even the entire amount of oil remain on the workpiece during the heating process and mix with the powder layer. If the oil on the workpiece surface in the kiln were unstable and would burn, for example, the color of the plastic coating would be greatly influenced by the oil and in particular by the oil's conversion processes under the influence of temperature. The slightest local temperature fluctuations in the kiln would lead to an uneven structure and color of the surface. This is reliably avoided with an oil that meets the condition specified in claim 3.
  • the embodiment according to claim 5 has the advantage that the electrostatically applied powder adheres as completely as possible to the workpiece surface and little powder falls off in the coating booth, which powder has to be recycled for economical powder utilization.
  • a surface coating that is particularly uniform both in terms of color and in terms of thickness and structure is achieved if, according to claim 6, the surface density of the oil film is less than approx. 3 g / m 2 , preferably approx. 0.3 to 1.5 g / m 2 , and the plastic coating is at least about 50 microns, preferably about 50 microns up to about 80 microns thick.
  • An oil film which remains on the surface of the cured coating according to claim 8 is an excellent lubricating film in further mechanical processing steps. For this purpose enough oil must be applied and the heat supplied by the furnace must be low enough so that there is still oil on the surface Workpiece surface remains.
  • test series with which particularly preferred configurations of the method according to the invention were determined are summarized in Tables 1 and 2.
  • steel test panels of type R from Q-Panel were oiled, electrostatically coated with powder and passed through a baking oven.
  • the coated sample plates were assessed under a microscope with regard to their optical quality and subjected to a cupping test in accordance with DIN ISO 1520 to determine the paint adhesion.
  • Table 1 shows the result of the optical assessment the hardened paint layer. The tests were carried out with different oils, which are given with their trade name, the manufacturer, the specification of the base oil and the respective viscosity at 40 ° C. The right five columns of Table 1 refer to different amounts of applied oil, to give areal densities of 0.5 to 2.5 g / m 2 in steps of 0.5 g / m 2 investigated. The table contains the symbol "x" if the oil in question has led to the formation of visible oil islands or oil inclusions in the paint layer. The paint layer then makes a "scarred” impression. An optically perfect surface is marked with the symbol "o".
  • Table 1 shows that there is a high optical quality of the coated plate when the surface density of the oil is a maximum of 2.0 g / m 2 and the viscosity of the applied oil at 40 ° C is below 40 mm 2 / s, ie if the oil is very thin.
  • a thin-bodied oil has the advantage that it can be applied particularly evenly and also diffuses particularly easily through the powder layer in the stoving oven and volatilizes. This is especially true when the amount applied is very small. With a surface density of 0.5 g / m 2 , optically perfect surfaces result for almost every oil.
  • the optical quality of the surface is independent of whether the oil is made from mineral oil or from a vegetable oil, such as rapeseed oil.
  • Table 2 shows the results of the cupping test according to DIN ISO 1520, with which the adhesion of the paint layer was measured. During the deepening test, the sample plate is deformed by a stamp and the depth of the deformation at which the lacquer layer breaks is noted. With good paint adhesion, high values are achieved.
  • Table 2 lists various oils and the length of time in the stoving oven. The right five columns are arranged as in Table 1 according to the amount of oil applied. The table contains the values of the deformation in mm at which one Cracking occurred. The oven temperature was always 180 ° C. This temperature was reached by the sample plates after a residence time of 14 minutes. The cupping values were measured after a stay of 14, 16 and 18 min. In addition, for comparison, test plates were examined which were completely degreased in a conventional manner before the tests (“unoiled test plates”).
  • Table 2 shows that the cupping value is 5.0 mm or more, which corresponds to a particularly good paint adhesion if the amount of oil applied does not exceed a surface density of 1.5 g / m 2 and a sufficient residence time in the oven is set.
  • the sufficient residence time was 18 minutes at an oven temperature of 180 ° C.
  • the amount of heat supplied to the sample plates under this condition is sufficient to essentially diffuse the oil through the powder layer and to allow it to volatilize.
  • the depression value is in the order of the value for unoiled or degreased sheets, ie in the order of 10 mm. This value indicates excellent paint adhesion.

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)
  • Chemically Coating (AREA)
  • Disintegrating Or Milling (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Claims (8)

  1. Procédé pour appliquer des revêtements en poudre durables sur une surface métallique munie d'un film d'huile, avec les étapes suivantes :
    application d'une couche de poudre de matière plastique,
    fusion de la couche de poudre par chauffage, et
    durcissement et refroidissement de la couche fondue,
    caractérisé en ce que la couche de poudre est appliquée directement sur ledit film d'huile constitué d'une huile à base d'huile minérale ou végétale.
  2. Procédé selon la revendication 1, caractérisé en ce que lors du chauffage, la quantité de chaleur apportée est telle que l'huile diffuse pour l'essentiel au travers de la couche de poudre et s'évapore.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on utilise une huile qui est stable pendant le chauffage dans la mesure où elle reste sur la surface métallique.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on utilise une huile qui est chimiquement stable de telle façon que, pendant le chauffage, elle ne provoque aucune décoloration de la couche de poudre.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le film d'huile est appliqué en une épaisseur tellement faible que l'adhésion de la couche de poudre appliquée de manière électrostatique n'est pas compromise.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la densité superficielle du film d'huile est inférieure à environ 3 g/m2 et comprise de préférence entre environ 0,3 et 1,5 g/m2, et que l'épaisseur de la couche de matière plastique formée par le durcissement est supérieure à environ 40 µm, et comprise de préférence entre environ 50 et 80 µm.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'une couche alcaline et/ou phosphatique est appliquée avant l'application de la poudre.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que des résidus d'huile forment une couche mince sur la surface de matière plastique durcie.
EP19910115563 1990-09-21 1991-09-13 Procédé pour appliquer des revêtements en poudre sur des surfaces métalliques Expired - Lifetime EP0476539B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904029985 DE4029985A1 (de) 1990-09-21 1990-09-21 Verfahren zum pulverbeschichten von metalloberflaechen
DE4029985 1990-09-21

Publications (3)

Publication Number Publication Date
EP0476539A2 EP0476539A2 (fr) 1992-03-25
EP0476539A3 EP0476539A3 (en) 1994-07-13
EP0476539B1 true EP0476539B1 (fr) 1996-10-09

Family

ID=6414726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910115563 Expired - Lifetime EP0476539B1 (fr) 1990-09-21 1991-09-13 Procédé pour appliquer des revêtements en poudre sur des surfaces métalliques

Country Status (16)

Country Link
US (1) US5264254A (fr)
EP (1) EP0476539B1 (fr)
JP (1) JP2851728B2 (fr)
KR (1) KR100221771B1 (fr)
AT (1) ATE143837T1 (fr)
AU (1) AU639138B2 (fr)
BR (1) BR9104047A (fr)
CA (1) CA2051879C (fr)
CZ (1) CZ283154B6 (fr)
DE (2) DE4029985A1 (fr)
DK (1) DK0476539T3 (fr)
ES (1) ES2093665T3 (fr)
GR (1) GR3021870T3 (fr)
RU (1) RU2004385C1 (fr)
SK (1) SK279241B6 (fr)
ZA (1) ZA917425B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105457874A (zh) * 2015-12-10 2016-04-06 太仓贝斯特机械设备有限公司 铝材建筑门窗的粉末静电喷涂方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5731042A (en) * 1995-11-07 1998-03-24 Glende; James A. Protectively coated outdoor fixtures
US6020034A (en) * 1997-11-14 2000-02-01 E. I. Du Pont De Nemours And Company Process for producing corrosion- and creep resistant coatings
US6676820B2 (en) 2001-03-02 2004-01-13 Ppg Industries Ohio, Inc. Process for electrocoating metal blanks and coiled metal substrates
DE102004062454A1 (de) * 2004-12-20 2006-06-29 Basf Ag Verfahren zum Beschichten von Metallen
KR101481316B1 (ko) 2013-09-05 2015-01-09 현대자동차주식회사 통합형 분체도료 조성물과 그 제조방법

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63227324A (ja) * 1987-03-16 1988-09-21 Daikin Ind Ltd 包みパツキン用外被の製法

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US2809906A (en) * 1952-11-25 1957-10-15 Wyandotte Chemicals Corp Phosphating compositions
GB1357214A (en) * 1971-06-29 1974-06-19 British Steel Corp Method and apparatus for coating a metallic strip
JPS5517268B2 (fr) * 1972-06-01 1980-05-10
US3794759A (en) * 1972-12-26 1974-02-26 Ibm Multi-terminal communication apparatus controller
DE2924111C2 (de) * 1979-06-15 1986-07-17 SMW Schneider & Weißhaupt GmbH, 7996 Meckenbeuren Einrichtung zur Überwachung des Druckes bei druckmittelbetätigten Spannfuttern mit im Betrieb rotierenden Spannzylindern an Bearbeitungsmaschinen
DE3109713A1 (de) * 1981-03-13 1982-10-21 Resicoat Gmbh Beschichtungspulver, 7410 Reutlingen Verbundbeschichtung und verfahren zur herstellung derselben
JPS592742A (ja) * 1982-06-25 1984-01-09 藤沢薬品工業株式会社 バイアル用栓体
NZ208332A (en) * 1983-08-02 1986-11-12 American Can Co Internally-coated deep-drawn metal container
US4746533A (en) * 1986-12-19 1988-05-24 Mobay Corporation Process for coating a metallic surface with a vitreous enamel
DE3800835A1 (de) * 1988-01-14 1989-07-27 Henkel Kgaa Verfahren zur phosphatierung von metalloberflaechen
DE3838928A1 (de) * 1988-11-17 1990-05-23 Columbus System Patent Ag Verfahren zum beschichten von bahnfoermigen bandblechen mit pulverlack und vorrichtung zur durchfuehrung des verfahrens

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Publication number Priority date Publication date Assignee Title
JPS63227324A (ja) * 1987-03-16 1988-09-21 Daikin Ind Ltd 包みパツキン用外被の製法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105457874A (zh) * 2015-12-10 2016-04-06 太仓贝斯特机械设备有限公司 铝材建筑门窗的粉末静电喷涂方法
CN105457874B (zh) * 2015-12-10 2018-05-11 太仓贝斯特机械设备有限公司 铝材建筑门窗的粉末静电喷涂方法

Also Published As

Publication number Publication date
EP0476539A3 (en) 1994-07-13
CS287091A3 (en) 1992-04-15
AU8455291A (en) 1992-03-26
US5264254A (en) 1993-11-23
CZ283154B6 (cs) 1998-01-14
CA2051879A1 (fr) 1992-03-22
KR100221771B1 (ko) 1999-09-15
DK0476539T3 (fr) 1997-03-17
SK279241B6 (sk) 1998-08-05
DE4029985A1 (de) 1992-03-26
AU639138B2 (en) 1993-07-15
JP2851728B2 (ja) 1999-01-27
ATE143837T1 (de) 1996-10-15
ES2093665T3 (es) 1997-01-01
EP0476539A2 (fr) 1992-03-25
CA2051879C (fr) 2000-08-22
JPH06339663A (ja) 1994-12-13
GR3021870T3 (en) 1997-03-31
ZA917425B (en) 1992-05-27
RU2004385C1 (ru) 1993-12-15
BR9104047A (pt) 1992-06-02
KR920006530A (ko) 1992-04-27
DE59108255D1 (de) 1996-11-14

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