Method for the application of a liquid film after aqueous pretreatment of the surface to be coated
AssigneeMankiewicz Gebr. & Co. GmbH & Co. KG
InventorMichael Grau
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Abstract
The invention concerns a method for producing removable surface protection by the application of a curable, liquid coating composition (liquid film), in which the surface is treated using water, or an aqueous solution of surface-active agents, and the coating composition is subsequently applied. Preferably, the surface is the topcoat of a motor vehicle. The invention further relates to the use of water or aqueous solutions of surface-active agents in such a method. Finally, the invention also relates to a removable surface protection coating of this nature. According to the invention, the flow of the coating composition into a uniform film is improved.
Claims15
Method for producing removable surface protection in which
- (a) the surface is treated using water or an aqueous solution of one or more surface-active agents,
- (b) a (liquid, curable) coating composition is applied to the treated surface before the water has dried completely from the treated surface, and
- (c) the coating composition is cured in order to obtain a hardened coating with a film thickness of at most 200 μm.
Method according to one of the preceding claims, characterized in that the temperature of the surface in step a) is up to 50° C., for example 1° C. to 50° C., preferably 5° C. to 40° C., more preferably 10° C. to 30° C., in particular 15° C. to 25° C.
Method according to one of the preceding claims, characterized in that the surface is a surface of a motor vehicle finished with topcoat paint.
Method according to one of the preceding claims, characterized in that step (b) takes place 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).
Method according to one of the preceding claims, characterized in that the coating composition is chosen from water-thinnable coating materials that are, for example, polymer-dispersion based, in particular polyurethane-dispersion based, and especially preferred, polyester urethane dispersion-based.
Method according to one of the preceding claims, characterized in that the coating composition is applied from a multi-jet nozzle with 1 to 6 rows of 5 to 500 nozzles per row, more preferably 10 to 320 nozzles, in particular 20 to 160 nozzles, such as 40 to 80 nozzles.
Method according to one of the preceding claims, characterized in that the film thickness of the cured coating is 40 to 170 μm, preferably 50 to 160 μm, more preferably 60 to 130 μm, in particular 70 to 120 μm, such as 80 to 110 μm or 90 to 100 μm.
Method according to one of the preceding claims, characterized in that the curing in step (c) takes place at elevated temperature.
Use of water or aqueous solutions of surface-active agents in a method for producing a removable surface protection coating, in which the water, or the solution of surface-active agents, is applied to the surface and then a coating composition is applied to the treated surface before the water has completely dried from the treated surface, in order to reduce the required quantity of coating composition as compared to a method without treatment using water or a solution of surface-active agents.
Use of water or aqueous solutions of surface-active agents in a method for producing a removable surface protection coating, in which the water, or the solution of surface-active agents, is applied to the surface and then a coating composition is applied to the treated surface before the water has completely dried from the treated surface, in order to avoid unwanted coating of certain areas of the surface with the coating composition (overspray).
Dependencies are inferred from the claim text.