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WO1991005659A1 - Systeme de traitement de surfaces - Google Patents

Systeme de traitement de surfaces Download PDF

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Publication number
WO1991005659A1
WO1991005659A1 PCT/US1990/005997 US9005997W WO9105659A1 WO 1991005659 A1 WO1991005659 A1 WO 1991005659A1 US 9005997 W US9005997 W US 9005997W WO 9105659 A1 WO9105659 A1 WO 9105659A1
Authority
WO
WIPO (PCT)
Prior art keywords
coat
group
top coat
graffiti
proprietary additives
Prior art date
Application number
PCT/US1990/005997
Other languages
English (en)
Inventor
Cassius W. Leys
Original Assignee
Leys Cassius W
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 Leys Cassius W filed Critical Leys Cassius W
Publication of WO1991005659A1 publication Critical patent/WO1991005659A1/fr

Links

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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • 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
    • B05D2503/00—Polyurethanes
    • 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
    • B05D2504/00—Epoxy polymers

Definitions

  • TITLE SYSTEM FOR TREATING A SURFACE
  • the present invention relates generally to a system for treating a surface which system makes the surface substantially resistant to markings of graffiti, makes the surface resistance to corrosion and acid rain, and provides a high degree of dielectric resistance.
  • the present invention also relates to a clear top coat system alone which is effective to improve the surface resistance to corrosion, acid rain attack and graffiti on certain
  • the present invention relates to such a system which includes a composition and method to treat such surface to render the surface substantially resistant to the permanent adhesion of subsequent markings of graffiti and to permit it to be readily, inexpensively and repeatedly cleaned using a certain cleaning composition without altering the surface or causing damage to any area in close proximity thereto.
  • the system also makes the surface resistant to salt and chemical corrosion and acid rain, and provides the surface with a high degree of dielectric resistance.
  • the top coat is used by itself. It is a transparent coat designed for use on traffic signs, marble, granite, limestone, sandstone and certain aggregates where transparency is required to make the surface resistant to salt and chemical corrosion, acid rain and graffiti.
  • This patent which is directed to a System for Treating a Surface, provides a system having a composition which treats a surface to render it substantially resistant to subsequent markings and to permit it to be readily and inexpensively cleaned using a particular cleaning composition without altering the surface or causing damage to any area in close
  • top coat alone is effective in improving the resistance to corrosion, acid rain and graffiti on certain substrates.
  • top coat which provides a transparent or clear coat so that the color and the texture of the surface is visible after application of the clear protective coating.
  • the present invention in brief summary, includes a system for treating a surface which system makes the surface substantially resistant to the subsequent adhesion of markings of graffiti, corrosion and acid rain attack, and provides a high degree of dielectric resistance properties.
  • the complete system includes the use of a water based epoxy mixture as an undercoat which is
  • the system of the present invention is particularly adapted for use on most surfaces generally susceptible to the application of graffiti and degradation by corrosion including, for example, masonry, wood and steel surfaces.
  • masonry surfaces may include cement, cement blocks, concrete, brick, mortar and the like.
  • the present system is particularly adaptable for use on steel structures such as bridges and piers for same, buildings, highway
  • the present system is particularly adapted for use on steel structures and electric conduit mediums to provide greatly enhanced dielectric resistance properties to the metal substrates as well as long term corrosion resistance.
  • scraping, degreasing, brushing down, and/or light sanding may be required to enhance the adhesion or bonding of the undercoat or base coat to the surface.
  • splinters, rust, scale or loose pieces of debris such as, for instance, paint chips or the like
  • the surface has previously been painted several times, it is preferable to "roughen up" the surface to make sure the previous coating has firm adhesion and provides adhesion for the present system.
  • the surface should be washed with water or a mild solvent to remove any deposited dirt, grease and surface film which might affect bonding.
  • a base coat is applied to either a wet or dry, but clean, surface to mask over and cover any existing graffiti and rust to prevent any such graffiti from bleeding through. Further, the base coat will abate corrosion, in particular salt and chemical corrosion, and acid rain attack. Still further, the base coat provides a solid undercoat for the subsequent application of a protective top coat to any surface that is treated to prevent subsequently applied graffiti from permanently adhering and stop and prevent, salt and chemical corrosion, and acid rain or chemical attack, and to enhance dielectric resistance properties of the coated surface. With this system, it is not necessary to take metal down to the "white metal" which is usual to stop rust.
  • a preferred base coat is a water based epoxy paint.
  • Water based epoxy paint has been known to be particularly effective in covering (masking) any existing graffiti and preventing bleed through. It is now appreciated that it is particularly effective in covering any rust residue and preventing the coating system from being raised or buffered off by any such underlying rust. In virtually all instances, such water based epoxy paints neither chemically attack the surfaces to which they are applied nor the graffiti which may be found thereon. This is due to the fact that a water based epoxy paint is incapable of reacting with or softening any underlying graffiti which is typically a solvent based paint. What has been found is that the water based epoxy paints tend to effectively seal the graffiti and residual surface rust on the surface. This is in direct contrast with a solvent based epoxy paint which may tend to react with, raise, remove, partially dissolve and absorb the underlying graffiti and otherwise incompletely bond with the
  • any moisture remaining on the surface of metal or the underlying substrate is commingled with and utilized in curing the water based epoxy.
  • the preferred water based epoxy paint of the present invention is a water based epoxy paint mixture consisting of three basic parts.
  • the system includes an amine
  • One example of a viable water based epoxy paint formula having two parts of the system is the product Dur-A-Poxy 200, which is
  • This paint formula has the amine emulsion and the diglycidyl ether of disphenol A emulsion, but not the proprietary additives.
  • Dur-A-Poxy 200 is a catalyzed, true epoxy which will not alter 20 the surface to which it is applied, but rather, will seal the graffiti and/or corrosion on the surface. It has been found that the use of a catalyzed epoxy provides a good coating with strong adhesion
  • the amine emulsion mixed with a catalyst and the proprietary additives serve to set up a permanent bond with the underlying surface.
  • the properties of the water based epoxy paint employed should be such that the graffiti it covers will not "bleed through”. That is to say, the underlying graffiti will not react with, lift off, or penetrate through the undercoat. It simply becomes encapsulated under the epoxy coating.
  • the proprietary additives discussed above comprise an accelerator and an ingredient selected form the group consisting of 2, butoxy ethanol (butyl celusolve) and
  • the proprietary additives may also include lavender oil and distilled water.
  • the accelerator is a tertiary amine which accelerates the reaction between the undercoat and the surface to be treated.
  • the tertiary amine should be combined with distilled water. It is preferred that the accelerator be present in an amount between about 1 to about 3 ounces, with the preferred amount being about 2 ounces.
  • Distilled water is used since it does not contain chlorine or fluorine.
  • the proprietary additives should constitute between about 8 to 12 ounces, but preferably about 8 ounces of the base coat.
  • the distilled water should be present in an amount between about 2 1/2 to 7 ounces depending on the temperature at which the undercoat will be used and the total amount of the proprietary additives is about 8 to about 12 ounces. Specifically, the hotter or higher the temperature, the greater the amount of distilled water to be used.
  • the distilled water is present in an amount about 2 1/2 ounces.
  • the lavender oil should be present in an amount of about 1/2 of an ounce. Further, either 2, butoxy ethanol, which is sold under the mark
  • N-methylpyrrolidone which is sold under the mark M-pyrol by G.A.F., should be present in an amount between about 2 to about 4 ounces, preferably about 3 ounces.
  • the base coat mixture comprise about one gallon of amine emulsion, about one gallon of diglycidyl ether of disphenol A emulsion and 8 to 12 ounces of the proprietary additives.
  • the amine emulsion and the proprietary additive either 2butoxy ethanol or
  • N-methylpyrrolidone N-methylpyrrolidone
  • the base coat may be applied to the surface by
  • the base coat which is preferably applied to a dried film thickness of between about 0.002 and about 0.003 inches, may, in certain instances, be diluted at the beginning of the mixing only by the addition of up to about 10% water for ease of application.
  • one gallon of the base coat will typically cover between about 150 to about 200 square feet of surface area although this will vary greatly as a function of the porosity of the surface being covered. For example, more porous surfaces, such as for example concrete and the like, will tend to absorb greater amounts of the base coat than less porous surfaces such as for example steel and other metals.
  • thickness is the thickness of the layer when the layer is first applied.
  • the wet film thickness will shrink to between about 40 to about 50 percent when it dries and the thickness when the coat is dried is called the dry film thickness.
  • wet film thickness is about 40 to about 50 percent greater than the dry film thickness.
  • the thickness used in the present application is the dry film thickness unless indicated to the contrary. Whether or not the base coat is actually diluted depends in large measure upon the vehicle used for
  • One advantage of diluting the base coat is that is has been found to increase its pot life. After application, the base coat is permitted to dry for a period of at least about two (2) to about three (3) hours depending on relative humidity to permit release of any moisture which may be contained in the base coat. This is an improvement over the undercoat system of U.S. Patent No. 4,716,056, which took approximately four to eight hours. The improvement is attributed to the use of the proprietary additives.
  • a top coat of the present application is then applied to the surface over the base coat.
  • preferred top coat includes a mixture of a modified
  • polyurethane resin a catalyst, a reduction agent and certain proprietary additives. These proprietary additives are admixed together immediately prior to application of the top coat to the substrate.
  • a particularly preferred polyurethane resin is a fully cross-linked polyurethane resin such as, for example, the polyurethane resin marketed by PPG Industries, Inc. under the mark "Durethane". It should be understood that the polyurethane resin coat can be either clear or a color resin coat. The polyurethane, however, has been modified to remove the organotin and dibutyltin laurate which are film softeners known as DXU 790 available through PPG
  • a particularly preferred polyurethane catalyst is the catalyst marketed by PPG Industries, Inc. under the
  • the purpose of the reducing agent or thinner is to facilitate the ease of application of the top coat.
  • the amount of thinner added will vary between about one-quarter to three-quarters of a gallon depending upon which
  • top coat is used to apply the top coat and also depending on the degree of porosity of the substrate or surface to which the top coat is applied.
  • the top coat is modified to include additives.
  • the additives comprise a resin hardener and film former which is known as DXU 789, also available through PPG Industries, Inc., an accelerator, and an ultraviolet absorber (UV absorber).
  • DXU 789 resin hardener and film former which is known as DXU 789, also available through PPG Industries, Inc.
  • an accelerator and an ultraviolet absorber (UV absorber).
  • UV absorber ultraviolet absorber
  • the polyurethane resin after modification does not contain any DXU 789 or DXU 790.
  • DXU 789 should be added to the top coat to provide a hardener and film former.
  • the total amount of DXU 789 in the top coat should be between about 5 to about 10 ounces, with the preferred range between about 4 to about 6 ounces.
  • the actual amount of DXU 789 in the top coat depends upon the temperature. In particular, the amount of DXU 789 decreases as the temperature increases. Specifically, about six ounces is added when the temperature is about fifty degrees, about five ounces is added when the temperature is about
  • DXU 789 as set forth in the material safety data sheet of PPG Industries, Inc. is comprised in percentage by weight of 25 to 30 percent N-butyl acetate, 20-25 percent toluene, 2-5 percent isopropyl alcohol (anhydrous), 15-20 percent tertiary amine and 30-35 percent film formers, resins and additives.
  • the modification of the polyurethane resin results a reduction in the ability of the film to soften and increases the hardness and creates a non-microporous effect in the coating system.
  • An accelerator such as for example, toluene blended with dibutyltin laurate is used to accelerate or otherwise increase the cure time.
  • This accelerator which is sold under the mark DXR-81, is marketed by PPG Industries, Inc. and consists between about ninety-five percent to about one hundred percent toluene and between about one percent to about two percent dibutyltin laurate.
  • UV absorber needs to be a hindered amine light stabilizer (HALS).
  • HALS hindered amine light stabilizer
  • the UV absorber used stabilizes coatings without absorbing UV radiation making it uniquely suitable for stabilizing ultraviolet cured coatings.
  • a particularly preferred hindered amine light stabilizer UV absorber is Tinuven 292 which is sold by Ciba Geigy.
  • the ratio of the four proprietary additives is about 5 to about 10 parts hardener and film former, one part accelerator, and one part UV absorber.
  • the top coat may be applied to the surface over the base coat by conventional application means, i.e., by the use of a squeegee roller, brush, air assisted airless spray gun or an airless spray gun.
  • a particularly preferred means of application is by the use of an airless spray gun since it permits a faster and more even application.
  • the top coat includes the following components in the following amounts: Component Amount
  • the top coat which is preferably applied to a
  • dry film thickness of between about 0.002" and about 0.004" dry film thickness may not be diluted. At such a dry film
  • top coat one gallon of top coat will typically cover about 400 square feet of surface area. It has been found that that application of the base coat provides a strong and even surface for accepting the subsequent application of the top coat which bonds (fuses) with the base coat.
  • two relatively thin coats of the top coat is applied in serium, i.e., the second coat of the top coat is applied over the first coat before the first coat is permitted to cure.
  • the first coat is a light or tack or mist coat
  • the second coat is a normal coat which is between about 0.001" to 0.002" in wet coat thickness.
  • the total thickness of the top coat should be between about 0.002" and about 0.004" in dry coat
  • a preferred dry coat thickness is about 0.002".
  • top coat After application and drying of the top coat, the surface is now ready to be used in normal fashion. In those instances where subsequent cleaning of fresh graffiti is required, it has been found that the surface provided by the top coat may be easily cleaned with the cleaner formula in co-pending application filed August 30, 1989 titled Cleaner for Treating a Surface to the inventor of the present application.
  • the top coat prevents penetration of solvents and fluorine, chlorine and oxygen as they appear in nature and will withstand acids having a concentration level of five (5) percent or less. Further, the top coat provides a better, harder and more impervious system than the
  • the total thickness of both coats of the present system should be between about 3 to about 6 ml in dry film thickness if the system is to enhance its anti-corrosion and dielectric protective properties. It has been found that the present system has a dielectric breakdown voltage of 12.8 KV for the top coat and 14.1 KV for the system. This measurement was
  • the above system has been found particularly effective for treating a many types of surfaces, such as masonry, namely cement, cement blocks, concrete, brick, mortar and the like, wood and steel.
  • the system makes such surfaces substantially resistant to markings of graffiti and improves the surface resistance to corrosion and acid rain.
  • the system provides greatly enhanced dielectric resistance properties to the surface, especially a steel surface.
  • the system renders the surface substantially resistant to subsequent markings of graffiti and to permit it to be readily and inexpensively cleaned using a particular cleaning composition without altering the surface or causing damage to any area in close proximity thereto.
  • the system also makes the surface resistant to salt and chemical corrosion, especially caused by free radical ions of oxygen and chlorine, and acid rain attack, and provides the surface with enhanced dielectric resistance properties.
  • top coat of the system alone should be used in certain surfaces to improve those surfaces' resistance to corrosion, acid rain attack and graffiti and to maintain the color and texture of those surfaces.
  • certain surfaces such as for example, traffic sign
  • top coat alone is applied.
  • the top coat is a transparent coat which will not effect the color or damage the texture of the surface. It should be understood that the entire system can be used and, in fact, should be used if enhanced dielectric properties are desired. However, use of the entire system, i.e. with the base coat, would color the surface to be treated.
  • the top coat can be applied by an air assisted, airless spray, an airless spray and a squeegee roller.
  • a brush should not be used since it will cause bubbles on the surface.
  • the air assisted, airless spray is the most preferred method of application of the top coat.
  • the airless spray alone is preferred over the squeegee roller as alternative methods of application of the top coat.
  • the top coat is applied on several mist or tack coating layers when applied to traffic signs.
  • At least two and preferably four coating layers of the top coat are applied to the surface.
  • the coating layers are applied in a cross hatch pattern.
  • the first coating layer is applied either a vertical or horizontal direction
  • the second coating layer is applied in the other of the vertical or horizontal directions. It is preferred to properly treat or coat a surface that this be repeated, thus four coating layers will be applied to the surface.
  • Each coating layer is applied less than 0.0025" in wet film thickness.
  • the time between the application of each coating layer will vary between about ten to about fifteen minutes, depending on the surface. For example, the time between coatings for a non-porous surface, such as a traffic sign, while the time between coatings will be about ten minutes for a porous surface. This prevents sagging or running of the base and the top coats.
  • the total thickness of the top coat will be about one-quarter to about one-half mil in dry film thickness per tack coat.
  • a preferred system has been tested by United States Training Company and produced the following results: c a c
  • the system tested is one preferred embodiment of the present system and comprises a base coat system of a water based epoxy mixture including an epoxy coating hardener, an epoxy resin coating and first group of proprietary
  • additives which includes a tertiary amine and 2 butoxy ethanol; and, a top coat system including a modified polyurethane resin (without organotin), a catalyst, a reducing agent, and second group of proprietary additives which includes a hardener and film former, toluene blended with dibutyltin laurate and a hindered amine light

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Le système et le procédé décrits, qui servent au traitement de surfaces, rendent la surface traitée sensiblement résistante à l'inscription de grafitis, améliorent la résistance de la surface à la corrosion, à l'attaque des sels et des substances chimiques et lui confèrent un degré élevé de résistance dit électrique. Ce système comprend une couche de base époxy à base d'eau, qui est initialement appliquée sur la surface. Après le séchage de cette couche, on applique directement sur la couche de base un système de couche de finition comprenant une résine de polyuréthane modifiée sans laurate d'organo-étain et de dibutylétain, un catalyseur, un agent réducteur et des additifs, tel qu'un durcisseur de résine et un agent filmogène, un accélérateur et un absorbeur d'ultraviolets constitué par un agent de stabilité à la lumière à base d'amines à empêchement, et on laisse vulcaniser ce système de couche de finition. Pour certaines surfaces, la couche de finition peut être appliquée seule pour améliorer la résistance de la surface à la corrosion, à l'attaque des pluies acides et aux grafitis.
PCT/US1990/005997 1989-10-18 1990-10-18 Systeme de traitement de surfaces WO1991005659A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42380989A 1989-10-18 1989-10-18
US423,809 1989-10-18

Publications (1)

Publication Number Publication Date
WO1991005659A1 true WO1991005659A1 (fr) 1991-05-02

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ID=23680271

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/005997 WO1991005659A1 (fr) 1989-10-18 1990-10-18 Systeme de traitement de surfaces

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AU (1) AU6721190A (fr)
WO (1) WO1991005659A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2747325A1 (fr) * 1996-04-15 1997-10-17 Bigotte Claude Procede d'eradication des graffitis par traitement prealable des surfaces exposees
US5910535A (en) * 1996-05-03 1999-06-08 Decora, Incorporated Water based coating composition having sacrificial layer for stain removal
US6084020A (en) * 1994-08-16 2000-07-04 Decora, Incorporated Non-stick polymer-coated articles of manufacture, and process and coatings for the production thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351608A (en) * 1963-03-01 1967-11-07 Bayer Ag Stabilized polyurethanes
US4281078A (en) * 1979-11-26 1981-07-28 E. I. Du Pont De Nemours And Company High-solids polyurethane enamel coating composition
US4686248A (en) * 1984-02-28 1987-08-11 Shell Oil Company Preparation of binders for coatings, thermosetting coating compositions and their use
US4716056A (en) * 1986-12-24 1987-12-29 Frank Fox System for treating a surface
US4910073A (en) * 1988-02-04 1990-03-20 Danippon Ink And Chemicals, Inc. Bowling lane and method of repairing same
US4950542A (en) * 1986-04-30 1990-08-21 Barker Robert S Articles having aroma

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3351608A (en) * 1963-03-01 1967-11-07 Bayer Ag Stabilized polyurethanes
US4281078A (en) * 1979-11-26 1981-07-28 E. I. Du Pont De Nemours And Company High-solids polyurethane enamel coating composition
US4686248A (en) * 1984-02-28 1987-08-11 Shell Oil Company Preparation of binders for coatings, thermosetting coating compositions and their use
US4950542A (en) * 1986-04-30 1990-08-21 Barker Robert S Articles having aroma
US4716056A (en) * 1986-12-24 1987-12-29 Frank Fox System for treating a surface
US4910073A (en) * 1988-02-04 1990-03-20 Danippon Ink And Chemicals, Inc. Bowling lane and method of repairing same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6084020A (en) * 1994-08-16 2000-07-04 Decora, Incorporated Non-stick polymer-coated articles of manufacture, and process and coatings for the production thereof
US6120849A (en) * 1994-08-16 2000-09-19 Decora, Incorporated Process for producing coated articles of manufacture
US6153304A (en) * 1994-08-16 2000-11-28 Decora Incorporated Hydrophobic coating system for application to an inorganic, organic or metallic substrate
FR2747325A1 (fr) * 1996-04-15 1997-10-17 Bigotte Claude Procede d'eradication des graffitis par traitement prealable des surfaces exposees
US5910535A (en) * 1996-05-03 1999-06-08 Decora, Incorporated Water based coating composition having sacrificial layer for stain removal

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Publication number Publication date
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