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
  • B05D3/04—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 exposure to gases
• • 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
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/20—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films
• • 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
  • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
  • B05D1/322—Removable films used as masks
  • B05D1/325—Masking layer made of peelable film
• • 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
  • B05D3/10—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 other chemical means

Definitions

• the invention relates to a process for the preparation of a removable surface protection by applying a liquid, curable coating composition (also known as liquid ⁇ foil), in which treats the surface to be protected with what ⁇ water or an aqueous solution of surface active substances and then the Be Schweizerungszusammenset wetting is applied.
• a liquid, curable coating composition also known as liquid ⁇ foil
• the invention further relates to the use of water or aqueous solutions of surfactants in such a process.
• the invention also relates to such a removable surface protection.
• DE 198 54 760 A1 describes such a method for producing a removable surface protection on a lacquered motor vehicle body.
• a liquid is sprayed onto the painted body surface. This liquid solidifies into a peelable film, therefore such a liquid coating composition is also referred to as a liquid film.
• the application of the Flussigfolie takes place with two suerdusen different widths to avoid accidental spraying of surface areas that are not to be coated (overspray), and to achieve a sharp edge application.
• Disadvantages of the process described in DE 198 54 760 A1 are:
• the uneven layer thickness of the applied coating composition is higher at the edges of the applied web than in the middle of the web.
• the width of the web applied with a shed varies depending on the pressure at which the composition is discharged from the nozzle.
• the webs discharged from the fan nozzle must be applied overlappingly.
• the layer thickness of the applied film is additionally increased in the regions of the overlap of the webs.
• the width of the applied web is less dependent on the material pressure than when using a fan nozzle. Therefore, to coat larger areas with a closed film, it is not necessary to overlap the individual webs. The layer thickness distribution is therefore more uniform than when using a horrerduse.
• the individual caterpillars deposited next to one another must run together. Therefore, the individual caterpillars must have a relatively high layer thickness. The material consumption is demenwitzend higher than when using a suture.
• the object of the present invention was to provide a method with which the advantages associated with the use of a multi-jet nozzle can be exploited. At the same time, the disadvantages associated with such use of a multi-jet nozzle, in particular the associated increased material consumption and overspray, should be avoided. Finally, there is always a need for a process with lower material requirements and correspondingly thinner removable surface protection. It has now surprisingly been found that these objects are achieved and other problems of the prior art are avoided by treating the surface to be coated with water or an aqueous solution of one or more surface-active substances and then applying the coating composition.
• a closed course and a corresponding film are obtained even at lower layer thicknesses than when the liquid film is applied to dry surfaces. This reduces the material consumption per unit area and still creates a closed film.
• the material pressure can be reduced so far that the back-spraying of the coating material can be avoided.
• a significant advantage of the application method according to the invention with prewetting compared to the non-inventive application method without prewetting is the material savings of 15 to 20% per unit area, which is achieved in the inventive method.
• washing surfaces to be coated with water or aqueous cleaning agents is known as pretreatment prior to coating. It removes impurities that could interfere with the adhesion of the coating to the surface. However, the water or the aqueous cleaning agent is completely removed from the surface before the application of the coating material.
• the invention relates to a method for producing a removable surface protection, in which a) the surface is treated with water or an aqueous solution of one or more surface-active substances,
• the coating composition is cured to form a cured coating having a layer thickness of at most 200 ⁇ m.
• the surface is treated in step a) with water, which may optionally be condensed by condensation on the surface of water supersaturated air.
• the pretreatment by condensation has the advantage that the generated water layer thicknesses are gleichlingerig and low.
• application technology for spraying water can be dispensed with.
• the treatment with water or the aqueous solution of surface-active substances takes place on the surface by spraying.
• the Tem ⁇ temperature of the surface amounts in step a) 1 ° C to 50 0 C, preferably 5 ° C to 40 0 C, preferably 10 0 C to 30 0 C, in particular 15 ° C to 25 ° C ,
• the surface is a surface of a motor vehicle painted with topcoat.
• the coating structure on the vehicle surface is preferably a typical car body paint, for example, from a cathodic dip coating, optionally a filler, a basecoat and in addition a Clearcoat exists as a topcoat.
• a pigmented topcoat is used instead of basecoat and transparent clearcoat.
• the transparent or pigmented lacquer used as a final topcoat can be a lacquer based on, for example, a one- or two-component polyurethane system, or a melamine resin / polyol system.
• the polyols used to formulate the lacquer used as topcoat can be polyester, polyacrylate or polycarbonate polyols.
• the application of the coating composition is preferably carried out less than 25 minutes after step a), more preferably 0.1 seconds to 25 minutes, in particular 0.1 seconds to 15 minutes, such as 0.1 second to 10 minutes, or 1 second to 1 minute for example, 1 second to 45 seconds, or 1 second to 30 seconds after step a).
• the coating composition is preferably a water-dilutable coating material based on, for.
• polymer dispersions in particular polyurethane dispersions and more preferably dispersions of polyesterurethanes.
• the coating composition is z. B. by pouring, the deposition of material beads, by hydraulic spraying (airless), by hydraulic spraying with pneumatic assistance (Airmix), or applied by pneumatic atomization.
• different Dusenkonstruktionen can be used, such. B. fraerdusen, Schlitzdusen and Rundstrahldusen.
• a multi-jet nozzle having 1 to 6 rows of 5 to 500 nozzles each, more preferably 10 to 320 nozzles, particularly 20 to 160 nozzles, such as 40 to 80 nozzles.
• high viscous coating compositions can be used in comparison with the process without pre-wetting.
• Preferred viscosity ranges are 5 to 40, preferably 10 to 35, in particular 15 to 30 Pa-s.
• the layer thickness of the cured coating composition is preferably 40 to 170 ⁇ m, more preferably 50 to 160 ⁇ m, especially 60 to 130 ⁇ m, for example 70 to 120 ⁇ m, such as 80 to 110 ⁇ m or 90 to 100 ⁇ m.
• the Hard in step c) can be carried out at elevated temperature, for example at 10 0 C to 90 0 C, preferably 15 ° C to 80 0 C, in particular 15 ° C to 60 ° C, such as 20 ° C to 50 0 C.
• the invention further relates to a removable surface protection made according to the method of the invention.
• This surface protection is therefore characterized by the fact that it is present in a comparatively small layer thickness of (in the cured state) at most 200 microns, which ensures sufficient mechanical strength for the removal of the (hardened) surface protection, without an unnecessarily high amount of coating composition can be used what would be disadvantageous because of the associated higher costs and longer curing / drying times.
• the invention relates to the use of water or aqueous solutions of one or more surfactants in a process for making a removable surface protection wherein the water or solution of surfactants is applied to the surface and then a coating composition is applied to the treated surface before the surface has completely dried, to reduce the gen amount of coating composition, compared with a method without treatment with water or solution of surfactants.
• the invention also relates to the use of water odei. wassricje ⁇ Surfactant solutions in a process for making a removable surface protection wherein the water or solution of surfactants is applied to the surface and then a coating composition is applied to the treated surface before the surface is completely dried to avoid the undesirable coating of certain areas of the surface with the coating composition (overspray).
• FIG. 1 shows the application of the coating composition according to step b
• Figure 2 shows two cured coatings, wherein on the right a coating prepared according to the invention is shown and on the left a coating is shown, which was produced according to a process without step a), and
• Figure 3 shows the removal of a coating produced according to the invention.
• Figure 1 illustrates that the coating composition is required by means of a suitable metering device (pump) and discharged through a nozzle consisting of a plurality of holes.
• the individual caterpillars that form after exiting the nozzle combine to form a closed film upon impact with the surface.
• a certain overpressure is required, which allows the merging of the individual tracks and tracks into a film.
• FIG. 2 illustrates the advantages of the method according to the invention and correspondingly produced coatings.
• the aim of the invention is i.a. the reduction of the applied amount of coating composition per unit area.
• the applied caterpillars and webs of coating composition do not form a closed film (left). Only the pre-wetting leads by running the individual tracks to a film (right).
• the surface to be protected is pre-wetted, which leads to its uniform flow in the subsequent application of the liquid film, namely at lower application pressures and thus also amounts of coating composition.
• Figure 3 illustrates the peeling of a coating made according to the invention according to an embodiment of the invention, showing the step of peeling off of a bonnet.
• a water-dilutable one-component coating composition based on a polyurethane dispersion was used for the preservation of surfaces such as e.g. Car bodies applied.
• the composition forms after drying (even at room temperature) a mechanically and chemically highly resistant protective layer (dried liquid film). This can be removed by hand (peel off), as it is only connected by relatively weak adhesion forces with the surface to be protected.
• the dried composition is typically removed from the surface by simply peeling it off immediately prior to delivery of the automobile, exposing the underlying topcoat.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Paints Or Removers (AREA)
• Coating Apparatus (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38814335

Family Applications (1)

Country Status (9)

Families Citing this family (6)

Citations (10)

Family Cites Families (14)

• 2006
  • 2006-12-20 DE DE102006060398A patent/DE102006060398A1/de not_active Ceased
• 2007
  • 2007-10-01 AT AT07818585T patent/ATE467463T1/de active
  • 2007-10-01 US US12/518,605 patent/US8852688B2/en active Active
  • 2007-10-01 ES ES07818585.7T patent/ES2341499T5/es active Active
  • 2007-10-01 KR KR1020097012795A patent/KR101454042B1/ko active Active
  • 2007-10-01 PT PT07818585T patent/PT2107949E/pt unknown
  • 2007-10-01 DE DE502007003808T patent/DE502007003808D1/de active Active
  • 2007-10-01 EP EP07818585.7A patent/EP2107949B2/de active Active
  • 2007-10-01 WO PCT/EP2007/008505 patent/WO2008083733A1/de not_active Ceased
  • 2007-10-01 JP JP2009541787A patent/JP5286279B2/ja active Active

Patent Citations (10)

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