Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
  • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
  • B44D3/16—Implements or apparatus for removing dry paint from surfaces, e.g. by scraping, by burning

Definitions

• the present invention relates to a method for removing paints on surfaces by means of high-pressure water jets.
• Methods for cleaning surfaces are widely used which work with water jets compressed at high pressures. For example, building facades, ships and bridges are cleaned with it.
• the sandblasting process has also found widespread use.
• a prerequisite for the use of the described methods is a certain strength of the surfaces to be processed. Therefore, the methods could not be used for cleaning or processing surfaces which are essentially made of modern materials, such as plastics reinforced with glass fiber and carbon fiber or epoxy resin-based materials, as are used in particular in aircraft construction.
• pore fillers based on polyester are applied to the epoxy resin base body, on which in turn a so-called primer layer, for example based on polyurethane, is applied. Only this primer layer is then provided with the top coat. Depending on the aircraft type, three or four coats are applied before the top coat.
• the object of the present invention is to provide a method which allows only the top coat layer of a surface structure consisting of several plastic layers to be removed, optionally also removing the layer located under the top coat layer and which is environmentally compatible and not harmful to health.
• the surface is treated with an aqueous solution containing an organic, non-corrosive swelling agent
• the organic, non-corrosive swelling agent acts on the surface to be treated for a certain period of time depending on the nature of the surface and / or
• the surface is treated with a water jet with a temperature> 20 ° C and a pressure of 100 to 600 bar.
• water in the sense of the invention
• water is understood in the broadest sense. This can therefore be pure water in the chemical sense as well as normal tap water or reprocessed process water. If organic non-corrosive swelling agents are used, water jet is also understood to mean a jet from an aqueous solution in this regard.
• a water jet with an increased Tempe ⁇ temperature is preferably used ⁇ of 30 C to 100 ° C.
• the temperature of the water jet is adjusted; with easy-to-remove layers of paint, the temperature of the water jet can be kept rather low, while higher temperatures have to be used to remove other layers of paint.
• an aqueous solution containing benzyl alcohol as the organic, non-corrosive swelling agent.
• the benzyl alcohol is preferably used as an aqueous solution in 40 to 80% by volume.
• the aqueous solution of the organic, non-corrosive swelling agent can additionally contain auxiliaries; such as emulsifiers, surfactants, detergents, stabilizers, etc. contain.
• the method according to the invention is therefore preferably suitable for the treatment of thin-walled aluminum sheets and surfaces made of composite materials, such as GRP (glass fiber reinforced plastics) and carbon fiber reinforced materials
• the swelling agent is applied to the surfaces to be stripped by spraying or brushing on using customary methods.
• the top coat attacked by the organic, non-corrosive swelling agent is then removed by means of a water jet.
• the water jet emerges from a so-called flat or rotary nozzle.
• the water to be used is, for example, normal tap water, possibly at an elevated temperature, which is brought to the appropriate pressures of 100 to 600 bar, preferably 200 to 500 bar beforehand.
• the water jet can develop a recoil force of approx. 15 kp.
• thrusters can also be used.
• rotary nozzles are used in which the water pressure emerges at 200 to 500 bar, a nozzle size of 1 mm having proven to be advantageous.
• the water jet is preferably held onto the surface to be stripped from a distance of 50 to 150 mm at a flat angle.
• the nozzle is preferably driven at a speed of approximately 50 mm / ⁇ ec. moved on.
• the angle of incidence should be kept flat and preferably 30 to 60 °. It has proven to be advantageous to align the water jet so that it strikes at a positive angle, as seen in the cutting direction.
• the water jet can also be generated by an arrangement of a plurality of nozzles. As a result, a larger area is covered by the water jet.
• an aqueous solution containing an organic, non-corrosive swelling agent coatings can be removed from surfaces for the lightweight construction with the aid of a high-pressure water jet process.
• an aqueous solution containing benzyl alcohol is recommended, preferably in concentrations of 40 to 80%.
• Such solutions are commercially available and are sold by Turco (Turco 9064, 6088).
• the method according to the invention thus enables environmentally friendly and environmentally friendly removal of paints on surfaces, in particular aluminum and composite surfaces. It works by avoiding environmentally harmful mordants such as methylene chloride. If only a water jet at an elevated temperature is used, it is entirely sufficient to remove the paint residues present in the waste water and to return this process water to the process.
• non-corrosive 'swelling agent arise over the known prior art processes considerable advantages. These swelling agents are environmentally friendly and do not pose a health hazard.
• the water can be fed back to the high-pressure pump by filtering off the peeled paint residue. It is therefore possible to use the water several times and to further increase its economic effectiveness.
• the reuse of the water is also advantageous for environmental reasons.
• the amount of the non-corrosive, organic swelling agent can be optimized by a suitable choice of the temperature of the water jet which is adapted to the respective cleaning problem.

Landscapes

• Application Of Or Painting With Fluid Materials (AREA)
• Cleaning By Liquid Or Steam (AREA)
• Paints Or Removers (AREA)
• Washing And Drying Of Tableware (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6412086

Family Applications (1)

Country Status (8)

Family Cites Families (5)

• 1990
  • 1990-11-09 CA CA 2067231 patent/CA2067231A1/en not_active Abandoned
  • 1990-11-09 WO PCT/EP1990/001877 patent/WO1992003299A1/de not_active Application Discontinuation
  • 1990-11-09 EP EP19900916282 patent/EP0494989A1/de not_active Withdrawn
  • 1990-11-09 AU AU70432/91A patent/AU641977B2/en not_active Ceased
  • 1990-11-09 JP JP2515154A patent/JPH05500482A/ja active Pending
  • 1990-11-09 HU HU124390A patent/HUT63102A/hu unknown
  • 1990-11-09 BR BR909008019A patent/BR9008019A/pt not_active Application Discontinuation
• 1992
  • 1992-04-08 FI FI921557A patent/FI921557A0/fi not_active Application Discontinuation

Non-Patent Citations (1)

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