WO2007012106A1 - Composition de revêtement anti-graffiti sacrificiel - Google Patents

Composition de revêtement anti-graffiti sacrificiel Download PDF

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Publication number
WO2007012106A1
WO2007012106A1 PCT/AU2005/001854 AU2005001854W WO2007012106A1 WO 2007012106 A1 WO2007012106 A1 WO 2007012106A1 AU 2005001854 W AU2005001854 W AU 2005001854W WO 2007012106 A1 WO2007012106 A1 WO 2007012106A1
Authority
WO
WIPO (PCT)
Prior art keywords
graffiti
sacrificial anti
surface coating
water
preparation
Prior art date
Application number
PCT/AU2005/001854
Other languages
English (en)
Inventor
Ernie Aykut
Original Assignee
Biobarrier Pty Ltd
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
Priority claimed from AU2005904078A external-priority patent/AU2005904078A0/en
Application filed by Biobarrier Pty Ltd filed Critical Biobarrier Pty Ltd
Publication of WO2007012106A1 publication Critical patent/WO2007012106A1/fr

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Classifications

    • 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
    • C09D5/008—Temporary coatings

Definitions

  • the invention relates to a surface coating, which may be used as a sacrificial anti-graffiti surface coating.
  • Coatings have been developed to provide a protective barrier to protect an underlying surface from graffiti applied on top of the coating, and to make graffiti removal easier. These coatings are usually sacrificial to make graffiti removal easier. The term “sacrificial” means that the coating, as well as the graffiti, is removed during graffiti removal. Therefore a new coating must be applied after each graffiti removal.
  • the present invention provides a surface coating, which may be used as a sacrificial anti-graffiti surface coating.
  • the sacrificial anti-graffiti surface coating is environmentally friendly and biodegradable and does not require the use of organic solvents for its removal.
  • the Roth invention provides a method for coating substrate surfaces which are not water-absorbent.
  • the object of the present invention is to coat substrate surfaces with a coating which is permeable to air and water vapour and is adequately resistant to weathering.
  • the Roth invention provides a method for coating substrate surfaces which are not water-absorbent, which comprises coating the substrate surfaces with an aqueous composition containing an aqueous solution, dispersion and/or emulsion of film-forming substances and water repellent substances, in which the coating can be removed again by treatment with water.
  • film-forming substances are, for example, cellulose, cellulose ethers and cyclic polysaccharides, such as cyclodextrins.
  • cellulose cellulose ethers
  • cyclic polysaccharides such as cyclodextrins.
  • examples given of a water-repellent substance are the waxes candelilla and camauba, beeswax and lanolin; mineral waxes ceresin and ozokerite and chemically modified waxes.
  • Roth does not make use of tea leaves.
  • Svensson Polysaccharide Industries.
  • the Svensson invention provides a process for protecting a surface from non-desired contamination and for facilitating removal of said contamination from the surface, said process involving the following steps :
  • the present invention does not require the preparation of a solution containing at least two poly
  • Such a film for example, bearing graffiti
  • This film graffiti or air pollution is easily removable by washing the film using water of increased temperature and/or pressurized water supplied through a nozzle.
  • Svensson does not make use of tea leaves.
  • This specification concerns a process for the preparation of compositions for the prevention of graffiti. It concerns the use of synthetic waxes such as polytetrafluoroethylene (PTFE), polyethylene (PE), modified polytetrafluoroethylene by mixture or grafting, polypropylene, amorphous amides, olefin extracts from petroleum products and waxes of natural origin such as carnauba wax and beeswax.
  • PTFE polytetrafluoroethylene
  • PE polyethylene
  • modified polytetrafluoroethylene by mixture or grafting polypropylene
  • amorphous amides polypropylene
  • olefin extracts from petroleum products
  • waxes of natural origin such as carnauba wax and beeswax.
  • the specification states that waxes of the type PTFE-PE are "always" preferred.
  • the solvents which are used are butanol, isopropanol, ethanol, butyrolactone, cyclohexanone, N- methyl-pyrrolidone, dimethylformamide, butyl acetate, ethyl glycol acetate, ethoxy propyl acetate and butyl glycol.
  • Example 1 uses PTFE-PE (originating from Lanzer SA) and naphtha solvent (originating from Esso).
  • Example 2 uses wax of halogenated polyolefin (originating from Daniel Products Company) and naphtha solvent (originating from Esso).
  • Example 3 appears to use "Lanco-Wax® J but does not give a formula or composition. Although the present invention uses beeswax, the solvents are quite different ie. linseed oil and turpentine. BRIEF SUMMARY OF THE INVENTION
  • This invention provides a preparation for a sacrificial anti-graffiti surface coating, the preparation comprising at least one saccharide; and either in a first embodiment water or in a second embodiment an organic solvent.
  • saccharide means a monosaccharide, disaccharide or lower polysaccharide.
  • saccharide includes these alternatives.
  • a preferred disaccharide is sucrose (table sugar).
  • organic solvent means linseed oil, turpentine or mixtures of these and their synthetic equivalents.
  • the composition comprises about 5Og to about 75Og of at least one saccharide per I of water or, alternatively, the composition comprises about 70Og of at least one saccharide per about 300ml of water.
  • the composition comprises about 150 to about 50Og of at least one saccharide and about 10Og to 25Og beeswax and about 500 ml to about 1 1 linseed or turpentine oil.
  • the saccharide is dissolved in linseed oil or turpentine and the solution used to dissolve beeswax.
  • the softened film of beeswax may be applied to a surface to be protected.
  • the composition according to the invention comprises a saccharide, water and tea leaves and more preferably an insect repellent.
  • the tea leaves help the preparation to bond to surfaces to which it is applied and are used in amounts of about 0.5g to about
  • this embodiment comprises about 1.Og to about 3.Og tea leaves per I of water, and more preferably about 1.Og to about 1.5g of tea leaves per I of water.
  • tea leaves includes “tea dust”.
  • the tea leaves or tea dust may be selected' from a variety of black, red or green tea, or a combination thereof.
  • the tea leaves are black tea leaves.
  • the first embodiment comprises an insect repellent which may be a natural or synthetic essential oil.
  • Preferred essential oils include peppermint, thyme, lavender, lemongrass, tea tree, citronella, pennyroyal, spearmint, garlic, or a combination thereof.
  • the first embodiment comprises about 0.05ml to about 7.5ml, and more preferably about 0.08ml to about 2.5ml, of insect repellent.
  • the sacrificial anti-graffiti surface coating is prepared by mixing the saccharide with sufficient water to dissolve it at least partially at the selected temperature. It is preferable to apply the sacrificial anti-graffiti surface coating to a surface to be protected at a temperature of from ambient to about 50 ° C.
  • the first embodiment may also contain about 0.1 to about 1 g of citric acid per I of solution , preferably in solution form, as a binding agent.
  • a second aspect of this invention provides a method of making a sacrificial anti-graffiti surface coating, the method comprising mixing a mixture as defined above with the required amount of water.
  • the temperature of the water is from ambient to about 100°C.
  • the sacrificial anti-graffiti surface coating is applied to a surface to be protected at ambient temperature.
  • kits comprising a preparation for a sacrificial anti-graffiti surface coating as described above, the ingredients being contained in the kit together or separately, and the kit being arranged so that the ingredients may be mixed with sufficient water or organic solvent to prepare a sacrificial anti-graffiti surface coating.
  • the kit also comprises an applicator to apply the sacrificial anti-graffiti surface coating to a surface to be protected.
  • the preparation for the sacrificial anti-graffiti surface coating comprises at least one saccharide.
  • a preferred saccharide is a disaccharide such as sucrose (table sugar) since it is economical and readily available.
  • the first embodiment of the sacrificial anti-graffiti surface coating or surface coating also comprises tea leaves.
  • the tea leaves may be selected from a variety of black, red or green tea leaves, or a combination thereof.
  • Preferably the tea leaves are black tea leaves or tea dust.
  • the sacrificial anti-graffiti surface coating comprises about 1.0g to about 1.5g of tea leaves or tea dust : 300ml water : 70Og saccharide.
  • the tea leaves or tea dust may be removed from the sacrificial anti-graffiti surface coating prior to use.
  • citric acid aids binding of the coating to the surface to be protected.
  • the preparation for the sacrificial anti-graffiti surface coating or sacrificial anti-graffiti surface coating also comprises an insect repellent.
  • the insect repellent may be a natural or synthetic essential oil.
  • the sacrificial anti-graffiti surface coating comprises at least about 0.05ml of an insect repellent.
  • the preparation for the sacrificial anti-graffiti surface coating is made up as a powder, it may be packaged loose or in a tea-bag arrangement.
  • the prepared sacrificial anti-graffiti surface coatings may be stored for up to 2 to 3 years, possibly longer, without degradation.
  • the sacrificial anti-graffiti surface coating may be applied to a variety of types of surfaces including, but not limited to, porous and non-porous surfaces, treated or untreated surfaces, and painted or unpainted surfaces.
  • Surface examples include masonry, cement, brick, mortar, plasters, stuccoes, stone, wood, metal such as stainless steel, some plastics materials, glass, varnished or painted surfaces.
  • the surface may require some preparation before application of the sacrificial anti-graffiti surface coating, for example, pre-washing.
  • the sacrificial anti-graffiti surface coating may be applied to a surface to be protected by spraying, brushing, rolling or any other conventional application means.
  • the amount of sacrificial anti-graffiti surface coating needed to adequately cover a surface will be dependent on the nature of the surface to be protected.
  • the liquid embodiment of the invention is used for porous surfaces and the paste embodiment for non-porous surfaces.
  • One coat of paste will usually suffice for non porous surfaces.
  • a greater quantity of liquid will be be needed to provide adequate protection of a porous surface such as stucco, brick or cement compared to a non-porous surface such as a metal.
  • approximately 1 1 of the liquid sacrificial anti- graffiti surface coating will adequately cover around 10 square metres of a smooth non-porous surface and around 6 to 8 square metres of a rough porous surface.
  • each coat of the sacrificial anti-graffiti surface coating may typically be the same as a layer of lacquer on a smooth non-porous surface (i.e. about 1 mm). The sacrificial anti-graffiti surface coating will dry relatively quickly after application.
  • the sacrificial anti-graffiti surface coating forms a substantially transparent protective layer or barrier on the underlying surface.
  • any graffiti markings will not contact or penetrate the underlying surface.
  • the sacrificial anti-graffiti surface coating will also not detract from the appearance of the surface of the building, artistic work, signage and so on to which it may be applied.
  • the liquid embodiment of the surface coating should be an effective protective barrier for at least 2 to 3 months, possibly less if the surface is exposed to harsh weather conditions but up to 2 years if not exposed to the elements. In such conditions, it is preferable to re-apply the sacrificial anti-graffiti surface coating at regular intervals to ensure that it remains an effective protective barrier.
  • the paste embodiment will last for a minimum of 2 years.
  • the graffiti and/or soiling can be removed. Removal of the graffiti and/or soiling will also remove the sacrificial anti-graffiti surface coating.
  • the sacrificial anti-graffiti surface coating, and the graffiti and/or soiling may be removed by the use of high pressure water. Preferably, cold water is used during the removal process. Removal of the sacrificial anti-graffiti surface coating, graffiti and/or soiling will not cause any damage to the underlying surface.
  • a new sacrificial anti-graffiti surface coating may be applied.
  • Graffiti that may be removed with the sacrificial anti-graffiti surface coating includes markings made by such substances as spray or aerosol paints, paints, permanent inks, colour markers, felt-tip pens, ink pens, pencils, crayons, lipsticks and the like.
  • the sacrificial anti-graffiti surface coating may also protect a surface from soiling.
  • soiling as used herein includes soiling by pollution, waste, oil sprays, sea salt and so on.
  • the primary advantage of the sacrificial anti-graffiti surface coating of the present invention is that it is environmentally friendly, unlike some of the existing anti-graffiti coatings. It does not contain any toxic chemicals and is readily biodegradable.
  • the sacrificial anti-graffiti surface coating is also quick and easy to apply, and economical for repeated usage. Since the sacrificial anti-graffiti paste surface coating is substantially transparent, it will not detract from the appearance, ie the reflective values, of the surface of the building, artistic work, signage, and so on to which it may be applied.
  • Example 7 sucrose (table sugar) 60Og black tea leaves 5.Og tea tree oil 0.1ml water 300ml
  • sucrose (table sugar) 65Og black tea leaves 1.0g tea tree oil 0.1ml water 300ml
  • sucrose was dissolved at boiling point in the water and the tea leaves added.
  • the citric acid was added to improve the binding characteristics of the sacrificial anti-graffiti surface coating.
  • the eucalyptus oil was added as an insect repellent.
  • Example 10 sucrose (table sugar) 18Og beeswax 12Og linseed oil 700ml
  • the sacrificial anti-graffiti surface coatings of Examples 1 to 8 were prepared with water at a temperature of about 100°C and could be stored at ambient temperatures without affecting activity for some years.
  • Example 6 The black tea leaves present in the sacrificial anti-graffiti surface coating of Example 6 were removed prior to application to various test surfaces.
  • Example 10 the sucrose was dissolved at boiling point in the linseed oil and the beeswax added. The solution was diluted with linseed oil to soften the wax providing a satisfactory sacrificial anti-graffiti surface coating. The surface coating was 100% waterproof for long periods.
  • the sacrificial anti-graffiti surface coatings of Examples 1 to 9 were applied to some of the test surfaces when at ambient temperature by brushing or spraying. However, when using a spray gun it is recommended to warm and stir the sacrificial anti-graffiti coating prior to application, if fine spray nozzles are used.
  • each sacrificial anti-graffiti surface coating was applied to the test surfaces.
  • the sacrificial anti-graffiti surface coatings of Examples 1 and 3 to 9 were substantially transparent whereas the sacrificial anti-graffiti surface coating of Example 2 was visibly discoloured.
  • the discolouration of the sacrificial anti-graffiti surface coating of Example 2 was most likely caused by the amount of tea leaves used to prepare the sacrificial anti-graffiti surface coating.
  • the sacrificial anti-graffiti surface coatings of each example were left on the test surfaces for periods of up to 6 months. The test surfaces were exposed to different weather conditions including light rain, heavy rain, sunshine and heat, which were either naturally occurring or artificially simulated.
  • Example 3 The test surfaces were also exposed to other outdoor elements including insects. It was found that the sacrificial anti-graffiti surface coating of Example 3 washed away from the test surfaces with light rain, which was enhanced through use of a sprinkler, over a relatively short period of time. The sacrificial anti-graffiti surface coating of Example 3 did not seem to provide a very effective protective barrier to the underlying surfaces. The sacrificial anti-graffiti surface coating of Example 7 also did not seem to provide an effective barrier to the underlying surfaces. For various reasons, none of Examples 1 to 9 displayed substantial resistance to rain or spraying with water.
  • the sacrificial anti-graffiti surface coatings of most of the other examples which included tea leaves or tea dust, remained on the test surfaces for substantially long periods of time. Therefore, it is reasonable to assume that inclusion of tea leaves (or tea dust) provided an adhesive property to the sacrificial anti-graffiti surface coatings.
  • tea leaves or tea dust
  • the sacrificial anti-graffiti surface coating of Example 5 remained on the test surfaces during the test periods, it also attracted numerous insects. It was concluded that this was a result of the absence of an insect repellent in the sacrificial anti-graffiti surface coating. After a period of time, some of the remaining test surfaces were marked with paint containing a high grade acrylic thinner. The paint was allowed to remain on these test surfaces for periods of up to 2 weeks.
  • the sacrificial anti-graffiti surface coatings which remained on the test surfaces, were subsequently removed by gentle scrubbing using a soft-bristled brush dipped in a mixture of soap and water or by the use of high pressure water. The removal process removed the sacrificial anti-graffiti surface coatings together with the paint markings. There was no visible damage or scarring on any of the test surfaces after removal of the sacrificial anti-graffiti surface coatings.
  • the sacrificial anti-graffiti surface coatings of at least Examples 1, 2, 4, 5, 6, and 9 were shown to provide an effective protective barrier to the underlying test surfaces to which they were applied, that is, to surfaces which were protected from rain, such as the underneath of bridges, the interior of toilets, confined areas in bus and train stations. Since the sacrificial anti-graffiti surface coatings of
  • Examples 3 and 8 did not seem to remain on the underlying test surface for a substantially long period of time, it was concluded that the sacrificial anti-graffiti surface coatings of these two Examples did not provide an effective protective barrier.
  • the sacrificial anti-graffiti surface coating of Example 10 was also found to remain on the underlying test surface for a substantially long period of time and so provided an effective protective barrier.
  • the paste was found to provide a surface which was resistant to rain and thus could be used on unprotected surfaces.

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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)
  • Paints Or Removers (AREA)

Abstract

La présente invention concerne un revêtement de surface anti-graffiti sacrificiel qui est préparé à partir d’au moins un saccharide inférieur tel que défini dans la présente invention et de l'eau ou de la cire d'abeille et un solvant organique tel que défini dans la présente invention.
PCT/AU2005/001854 2005-07-29 2005-12-12 Composition de revêtement anti-graffiti sacrificiel WO2007012106A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005904078A AU2005904078A0 (en) 2005-07-29 Electrical system/s to save electricity
AU2005904078 2005-07-29

Publications (1)

Publication Number Publication Date
WO2007012106A1 true WO2007012106A1 (fr) 2007-02-01

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387434A (en) * 1993-09-01 1995-02-07 Bat Technologies Inc. Anti-graffiti coating material and method of using same
US5418006A (en) * 1992-01-23 1995-05-23 Wacker-Chemie Gmbh Coating of substrate surfaces
WO1995025604A1 (fr) * 1994-03-23 1995-09-28 Polysaccharide Industries Ab Psi Systeme de protection d'une surface contre les souillures
EP0798349B1 (fr) * 1996-03-25 2002-07-31 Bernd Neumann Agents pour appliquer un révêtement protecteur sur les surfaces dures, afin de les protéger des intempéries et des contraintes mécaniques ainsi que de l'action des produits chimiques, leur procédé de préparation et leur utilisation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418006A (en) * 1992-01-23 1995-05-23 Wacker-Chemie Gmbh Coating of substrate surfaces
US5387434A (en) * 1993-09-01 1995-02-07 Bat Technologies Inc. Anti-graffiti coating material and method of using same
WO1995025604A1 (fr) * 1994-03-23 1995-09-28 Polysaccharide Industries Ab Psi Systeme de protection d'une surface contre les souillures
EP0798349B1 (fr) * 1996-03-25 2002-07-31 Bernd Neumann Agents pour appliquer un révêtement protecteur sur les surfaces dures, afin de les protéger des intempéries et des contraintes mécaniques ainsi que de l'action des produits chimiques, leur procédé de préparation et leur utilisation

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