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WO1999038622A1 - Procede de production d'un revetement aplani sur une surface verticale - Google Patents

Procede de production d'un revetement aplani sur une surface verticale Download PDF

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Publication number
WO1999038622A1
WO1999038622A1 PCT/US1998/027347 US9827347W WO9938622A1 WO 1999038622 A1 WO1999038622 A1 WO 1999038622A1 US 9827347 W US9827347 W US 9827347W WO 9938622 A1 WO9938622 A1 WO 9938622A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
thickness
edge
film
coating formulation
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.)
Ceased
Application number
PCT/US1998/027347
Other languages
English (en)
Inventor
Dennis Erickson
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.)
Solutia Inc
Original Assignee
Solutia Inc
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 Solutia Inc filed Critical Solutia Inc
Priority to AU20096/99A priority Critical patent/AU2009699A/en
Publication of WO1999038622A1 publication Critical patent/WO1999038622A1/fr
Anticipated expiration legal-status Critical
Ceased 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

Definitions

  • This invention relates to a method for producing a coating of substantially even thickness on a vertical surface.
  • Liquid coatings applied to vertical surfaces are susceptible to defects commonly known as sagging, running and curtaining, as described in Percy E. Pierce and Clifford K. Schoff, Coating Film Defects
  • the decreased film thickness requires multiple applications of coating to achieve the same overall coating thickness.
  • Increasing the coating viscosity also decreases the flow velocity, and is typically accomplished by adding thickeners or thixotropes, or by using a solvent that evaporates relatively quickly. Modifying the coating formulation in this way adds to the cost of the coating and may be detrimental to other properties of the coating.
  • a method for producing a substantially even coating on a vertical surface without the use of, or with a reduction in the amount of additives would be extremely useful.
  • This invention is directed to a method for producing a coating of substantially even thickness on a coating area of a vertical substrate surface.
  • the method comprises the steps of: (a) applying a coating formulation comprising a carrier and a resin to the coating area from a first edge of the coating area of a substrate surface to a second edge of the coating area, said coating formulation being applied to produce a coating formulation thickness which increases continuously from the first edge to the second edge; and (b) situating at a higher vertical position whichever of the first edge or the second edge at which a surface tension of the coating formulation will be greater as the carrier evaporates than at the other edge.
  • Figure 1 is a side cross section of a substrate coated with a solvent-based coating formulation.
  • Figure 2 is a side cross section of a substrate coated with a water-borne coating formulation.
  • the method of the present invention produces a coating on a vertical surface with reduced tendency to sag, run or curtain. Without being bound to theory, this is believed to be accomplished by creating an approximate balance between the force due to surface tension and the force of gravity.
  • a coating formulation is applied unevenly across a predetermined area to be coated so that the thickness of the applied coating formulation (henceforth, "film") increases continuously.
  • the edge of the predetermined area at which the film thickness is a maximum is situated either above or below the edge at which the film thickness is a minimum.
  • the relative position of the edges is determined by the relative surface tensions of the components of the coating formulation. Typically, as the carrier evaporates, the surface tension of the film either increases or decreases. This change in surface tension will vary with the film thickness. It is desired in the method of this invention to place in a higher vertical position the edge at which the surface tension of the film will be greater as the carrier evaporates.
  • a solvent-based coating is purposely applied to a substrate unevenly and the substrate oriented so as to produce a film which increases in thickness towards the lower edge.
  • This comprises an embodiment of this invention illustrated in Figure 1, wherein the film 2 is applied unevenly on substrate 1, which is oriented so that the edge at which the coating is thicker is at the bottom.
  • the surface tension of the carrier is typically higher than - 5 -
  • the applied coating formulation 2 is not of uniform thickness on the substrate 1, the decrease in surface tension will vary with thickness.
  • the change in surface tension with evaporation of the carrier is greater in regions of lower thickness 3 than in regions of greater thickness 4.
  • the surface tension in the regions of lower thickness will decrease more than the surface tension in the regions of greater thickness, leading to a higher surface tension in the regions of greater thickness, i.e., the surface tension will be higher in region 4 than in region 3.
  • a surface coated with a water-borne film whose thickness increases from one edge to another edge is situated with the edge at which thickness is a maximum in a higher vertical position than the edge at which thickness is a minimum, as shown in Figure 2.
  • This produces an upward force on the coating formulation which retards downward flow due to gravitational forces to give a substantially uniform film thickness.
  • coating formulations deposited according to the method of this invention include, but are not limited to, automobile coatings and refinishes, general industrial coatings, architectural coatings, inks, paper coatings, general metal coatings, wood coatings, coil coatings, appliance coatings and container coatings.
  • Coating formulations for use in this invention comprise at least a carrier and a resin.
  • the formulations may - 6 -
  • pigments also include pigments, catalysts, flow modifiers, preservatives, stabilizers, buffers and any other components typically used in coating formulations.
  • resins suitable for use in this invention include, but are not limited to, polyesters, acrylics, alkyds, isocyanates, epoxies, butyrates, cellulose acetate, ethyl cellulose, alkylated melamine- formaldehyde, nitrocellulose, polyvinyl butyral, phenolics, urea-formaldehyde and urethanes.
  • Suitable carriers for use in this invention include, but are not limited to one or more of water, ethylene glycol, xylene, methyl isoa yl ketone, mineral spirits, n-butanol, methyl isobutyl ketone, methyl ethyl ketone and n-butyl acetate.
  • the coating formulations may be applied by any technique suitable for unevenly applying a coating formulation to a surface.
  • a suitable technique comprises placing the surface in a horizontal position, applying a coating formulation to the surface, drawing the coating formulation on the surface down with a wire wound rod supported on one side with a shim to produce a thickness gradient, and then repositioning the surface vertically in the proper orientation, depending on the identity of the carrier.
  • the thickness gradient is defined in terms of the increase in thickness with distance along the surface, and is measured in mils/inch of surface. Suitable gradients of coating thickness across the surface will vary with the nature of the coating formulation.
  • the resin of the coating was a 70:30 weight ratio mixture of high-solids polyester (available from
  • a mixture of methyl isoamyl ketone, xylene and n-butanol in a volume ratio of 68:23:9 was added at 33 parts on a total formulation of 701 parts. After the addition, the spray viscosity of the formulation was 23 seconds in a #4 Ford Cup with 1:1, xylene: isopropanol.
  • Example 1 The coating formulation of Example 1 was applied to a 4x12 inch Bonderite panel using a 3.6 mil wire wound rod. This resulted in a coating with a uniform thickness of 3.6 mils. The panel was placed in a vertical position for 10 minutes and was then placed in an oven in a horizontal position and cured at 260°F for 15 minutes. - 8 -
  • Example 1 The coating formulation of Example 1 was applied to a 4x12 inch Bonderite panel using a #22 (2.2 mil) wire wound rod supported on one twelve-inch side of the panel by a strip of tape with a thickness of 3.5 mils. This resulted in a coating thickness of 5.7 mils on the twelve-inch side near the tape and 2.2 mils on the other twelve-inch side, with the gradient running across a distance of four inches.
  • the panel was placed in a vertical position with the twelve-inch side having a 5.7 mil coating thickness at the top.
  • the panel was kept in a vertical position for 10 minutes and was then placed in an oven in a horizontal position and cured at 260°F for 15 minutes.
  • a panel was coated in the same manner as described in Comparative Example 2 , but was placed in a vertical position with the 5.7 mil thickness along the bottom edge. The panel was placed in a vertical position for 10 minutes and was then placed in an oven in a horizontal position and cured at 260°F for 15 minutes.
  • Example 1 The coating formulation of Example 1 was applied to a 4x12 Bonderite panel using a 3.5 mil wire wound rod supported on one end by a strip of tape with a - 9 -
  • the panel was placed in a vertical position with the 5.5 mil thickness along the bottom edge. The panel was placed in a vertical position for 10 minutes and was then placed in an oven in a horizontal position and cured at 260°F for 15 minutes.
  • the resin used in the coating was a mixture of a water- reducible polyester 72-7203 (available from McWhorter Technologies, Carpentersville, IL) and elamine resin Resimene 747 (available from Solutia, Inc., Springfield, MA) in a 7:3 ratio based on solids content.
  • the coating formulation after addition of distilled water, pigment, amine buffer and flow modifier, contained 22.20% polyester and 6.75% melamine resin. Titanium dioxide pigment was present in the coating formulation at 20.68% by weight of the formulation, and Modaflow AQ-3000 flow agent (available from Solutia, Inc., Springfield, MA) was present at 0.52% by weight of the formulation.
  • Nacure 1040W catalyst (available from King Industries, Norwalk, CT) was added to the coating formulation in an amount sufficient to provide 0.8% catalyst based on the total resin solids (TRS) .
  • Example 5 The coating formulation of Example 5 was applied to a 4x12 inch Bonderite panel using a #34 (3.4 mil) wire wound rod. This resulted in a coating with a uniform thickness of 3.4 mils. The panel was placed in a vertical position for 10 minutes and was then placed in an oven in a vertical position and cured at 270°F for 20 minutes. - 12 -
  • Example 5 The coating formulation of Example 5 was applied to a 4x12 inch Bonderite panel using a #34 (3.4 mil) wire wound rod supported on one side by a strip of tape with a thickness of 2.4 mils. This resulted in a coating thickness of 5.8 mils on the side near the tape and 3.4 mils on the other side.
  • the panel was placed in a vertical position with the 5.8 mil thickness along the top edge. The panel was placed in a vertical position for 10 minutes and was then placed in an oven in a vertical position and cured at 270°F for 20 minutes.
  • a panel was coated in the same manner as described in Example 6, but was placed in a vertical position with the 5.8 mil thickness along the bottom edge. The panel was placed in a vertical position for 10 minutes and was then placed in an oven in a vertical position and cured at 270°F for 20 minutes.
  • Example 6 The average film thicknesses for the coating of Comparative Example 3, a control in which a film of uniform thickness was applied, show that sag occurred, leading to a greater thickness at the middle and bottom of the panel.
  • Example 6 the coating was applied in the desired direction, i.e., with the thicker end up, resulting in a fairly uniform thickness. Although the coating is slightly thicker in the middle, thickness is more uniform than in the control, despite the much greater thickness of the coating in Example 6.
  • Comparative Example 4 the coating was applied in the opposite of the desired direction, i.e., with the thicker end down. The thickness gradient in this coating is clearly greater than optimum because sagging occurred in this case.

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  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé de production d'un revêtement d'une épaisseur sensiblement aplanie sur une surface verticale par l'application d'une formulation de revêtement présentant une épaisseur augmentant sans cesse d'un bord à l'autre et par le positionnement du bord au niveau duquel la tension superficielle de la formulation de revêtement sera plus importante, alors que le support s'évapore dans une position verticale plus élevée par rapport à l'autre bord.
PCT/US1998/027347 1998-01-28 1998-12-24 Procede de production d'un revetement aplani sur une surface verticale Ceased WO1999038622A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU20096/99A AU2009699A (en) 1998-01-28 1998-12-24 Method for producing an even coating on a vertical surface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1476898A 1998-01-28 1998-01-28
US09/014,768 1998-01-28

Publications (1)

Publication Number Publication Date
WO1999038622A1 true WO1999038622A1 (fr) 1999-08-05

Family

ID=21767618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/027347 Ceased WO1999038622A1 (fr) 1998-01-28 1998-12-24 Procede de production d'un revetement aplani sur une surface verticale

Country Status (3)

Country Link
AR (1) AR016019A1 (fr)
AU (1) AU2009699A (fr)
WO (1) WO1999038622A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB936147A (en) * 1958-09-26 1963-09-04 Saint Gobain Improvements in or relating to a process and apparatus for coating articles
US3839988A (en) * 1969-07-30 1974-10-08 Durr O Apparatus for treating articles by immersion in dip tanks
US4476162A (en) * 1982-04-30 1984-10-09 Ireland Jack W Method for coating lenses
US5094891A (en) * 1990-02-02 1992-03-10 A. O. Smith Corporation Vertical dip thin perimeter manufacturing method and facility for coating vehicle structural components
US5241921A (en) * 1992-07-15 1993-09-07 Sadlak Michael W Water skiing boom
EP0646419A2 (fr) * 1993-09-30 1995-04-05 Mazda Motor Corporation Appareil de revêtement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB936147A (en) * 1958-09-26 1963-09-04 Saint Gobain Improvements in or relating to a process and apparatus for coating articles
US3839988A (en) * 1969-07-30 1974-10-08 Durr O Apparatus for treating articles by immersion in dip tanks
US4476162A (en) * 1982-04-30 1984-10-09 Ireland Jack W Method for coating lenses
US5094891A (en) * 1990-02-02 1992-03-10 A. O. Smith Corporation Vertical dip thin perimeter manufacturing method and facility for coating vehicle structural components
US5241921A (en) * 1992-07-15 1993-09-07 Sadlak Michael W Water skiing boom
EP0646419A2 (fr) * 1993-09-30 1995-04-05 Mazda Motor Corporation Appareil de revêtement

Also Published As

Publication number Publication date
AU2009699A (en) 1999-08-16
AR016019A1 (es) 2001-05-30

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