WO2009144495A2 - Composition de revêtement hydrophobe - Google Patents

Composition de revêtement hydrophobe Download PDF

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Publication number
WO2009144495A2
WO2009144495A2 PCT/GB2009/050572 GB2009050572W WO2009144495A2 WO 2009144495 A2 WO2009144495 A2 WO 2009144495A2 GB 2009050572 W GB2009050572 W GB 2009050572W WO 2009144495 A2 WO2009144495 A2 WO 2009144495A2
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WO
WIPO (PCT)
Prior art keywords
composition
hydrophobic coating
coating composition
silane
hydroxy
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Application number
PCT/GB2009/050572
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English (en)
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WO2009144495A3 (fr
Inventor
Keith Macgregor
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Si Laboratories Limited
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Publication date
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Publication of WO2009144495A2 publication Critical patent/WO2009144495A2/fr
Publication of WO2009144495A3 publication Critical patent/WO2009144495A3/fr

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    • 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
    • C09D5/16—Antifouling paints; Underwater paints
    • C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
    • C09D5/1662—Synthetic film-forming substance
    • C09D5/1675—Polyorganosiloxane-containing compositions
    • 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
    • C09D5/16—Antifouling paints; Underwater paints
    • C09D5/1606—Antifouling paints; Underwater paints characterised by the anti-fouling agent
    • C09D5/1637—Macromolecular compounds
    • 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
    • C09D5/16—Antifouling paints; Underwater paints
    • C09D5/1693—Antifouling paints; Underwater paints as part of a multilayer system

Definitions

  • the present invention relates to a hydrophobic coating composition applied to a surface to prevent or reduce contamination of the surface.
  • contamination may include biological, microbiological, chemical, and/or radiological contamination.
  • Fouling on underwater surfaces of seaborne vessels such as boats can seriously affect their performance, in particular their speed, acceleration and fuel efficiency, as well as in some cases hasten surface corrosion, which can reduce lifetime and encourage further fouling. Once fouling has taken hold it will not be removed through motion of the boat whereto it is attached, and prolonged fouling will damage the substrata of a boat.
  • a hydrophobic coating composition for coating a surface comprising a hydroxy- terminated siloxane; and at least one silane.
  • the composition does not comprise an aluminium component or a glass component.
  • aluminium component is meant either aluminium metal, or a water-insoluble aluminium compound, for example aluminium oxide or an aluminium silicate.
  • glass component is meant a particulate glass component comprising glass that has been particulated.
  • a siloxane has the general formula:
  • R 1 and R 2 may be any hydrocarbyl group optionally substituted, or a further siloxane branch in accordance with the above structure, and n may be any integer greater than 2.
  • R 1 and R 2 are preferably the same, and are preferably branched or unbranched alkyl radicals.
  • a hydroxy-terminated siloxane has at least one free hydroxyl group in the molecule, preferably attached to a terminal silicon atom. This includes where the terminal silicon atom is comprised of a branched or cross-linked siloxane .
  • composition due to its extreme hydrophobic properties has, it is believed, an unusual marine antifouling property in that bacterial organisms, which are the base for marine growth contamination, will attempt to colonise an underwater surface. However, not being able to adhere, the lipids which are part of the bacterial membrane will spread attempting to secure adhesion. Ultimately this action will result in bursting of the bacterial membrane and deactivation of the microorganism.
  • the at least one silane renders the composition curable.
  • composition is curable to give a coating comprising a polymer matrix.
  • the at least one silane chemically crosslinks the hydroxy-terminated siloxane upon curing the composition. This has the advantage that the composition is stable on storage, and during application, so as to remain either sprayable or spreadable.
  • the composition is preferably "slippy" to the touch when in the form of a dried coating on a substrate.
  • the composition is curable upon the surface to give a substantially non-stick coated surface such that water dropped onto a coated surface forms beads, which may readily run off it when it is tilted by 10° from the horizontal.
  • the composition further comprises an adhesion promoter.
  • the at least one silane comprises the adhesion promoter.
  • the composition adheres to aluminium, alloys, stainless steel, wood, GRP, painted surfaces, and rubber bitumen.
  • the composition will adhere to a cured or partially cured layer of the same. This allows for the application of several layers, or reapplication of a partially depleted layer to maintain the effect imparted upon a surface by the present invention.
  • the hydroxy-terminated siloxane preferably comprises a polymer or a co-polymer, and more preferably comprises a polymer, most preferably a homopolymer.
  • the hydroxy- terminated siloxane may comprise a polydialkylsiloxane, and most preferably comprises polydimethylsiloxane .
  • the hydroxy-terminated siloxane preferably comprises a polymer which terminates with at least one hydroxyl group, and most preferably with a hydroxyl group at each terminus. A terminus may include the end/terminus of a branched or cross-linked siloxane chain.
  • the hydroxy-terminated siloxane comprises an unbranched polysiloxane .
  • the hydroxy-terminated siloxane preferably comprises from 20 to 75 wt% of the composition, preferably from 25 to 70 wt% of the composition, and more preferably from 45 to 65 wt% of the composition, and most preferably from 50 to 55 wt% of the composition.
  • the hydroxy-terminated siloxane preferably has a viscosity of at least 10 poise (P) (1 Pascal-seconds,
  • Pa. s preferably at least 100 P (10 Pa. s), more preferably at least 250 P (25 Pa. s), most preferably at least 400 P (40 Pa. s) .
  • the viscosity is no more than 1000 P (100 Pa. s), preferably no more than 750 P (75 Pa. s), most preferably no more than 600 P (60 Pa. s) .
  • the composition preferably further comprises a plasticizer.
  • the plasticizer may be a siloxane, preferably a non-hydroxy-terminated siloxane.
  • the non- hydroxy-terminated siloxane is preferably a polydialkylsiloxane .
  • Suitable siloxane polymers or oligomers may include dimethylpolysiloxane, diethylpolysiloxane, diphenylpolysiloxane, dimethoxypolysiloxane, diethoxypolysiloxane, dimethylpolysiloxane ethoxylate, poly [methyl (3, 3, 3- trifluoropropyl) siloxane] , hexamethyldisiloxane, hexaethyldisiloxane, hexaphenyldisiloxane, 1,1,3,3- tetramethyldisiloxane, 1,1,3, 3-tetraethyldisiloxane, 1,1,3, 3-tetraisopropyldisiloxane, 1, 3-diethoxy-l, 1,3,3- tetramethyldisiloxane, 1, 3-dimethyltetravinyldisiloxane, pentamethyldisilox
  • the non-hydroxy-terminated siloxane preferably comprises no cross-linkable moieties, and preferably no free hydroxyl groups .
  • the non-hydroxy-terminated siloxane preferably has a viscosity of at least 1 poise (P) (0.1 Pascal-seconds, Pa. s), more preferably at least 5 P (0.5 Pa. s), most preferably at least 9 P (0.9 Pa. s) .
  • P viscosity
  • the viscosity is no more than 100 P (10 Pa. s), more preferably no more than 50 P (5 Pa. s), and most preferably no more than 11 P (1.1 Pa. s) .
  • the at least one silane preferably comprises at least one leaving group, and more preferably at least two leaving groups.
  • the at least one leaving group preferably comprises a group whose conjugate acid has a pK a in water of between 8 and 17, preferably between 9 and 15, preferably between 11 and 13.
  • the at least one leaving group may comprise a moiety selected from the group including aryloxy, haloalkoxy, oxime, ketooxime.
  • the at least one silane may comprise a ketoxime silane.
  • Suitable silanes may include tetraethyl silane, tetraallyl silane, tetraphenyl silane, tetrakis (3- fluorophenyl) silane, tetrakis (p-tolyl) silane, ethyltriacetoxysilane, isobutyl (trimethoxy) silane, triacetoxy (vinyl) silane, triethoxy (ethyl) silane, triethyl (trifluoromethyl) silane, trimethoxy (vinyl) silane, trimethyl (phenyl) silane, N-beta- (aminoethyl) -gamma - aminopropylmethyldimethoxysilane, trimethyl (vinyl) silane, tris (2-methoxyethoxy) (vinyl) silane, methyltris (dimethylketoxime) silane, l-phenyl-2- trimethylsilylacety
  • Such silanes may typically comprise up to 20 wt% of the overall composition, but more preferably 1 to 10 wt%, and most preferably 2 to 8 wt%.
  • the silanes suitably act as crosslinking agents, catalysts, tensile elasticity control, and adhesion promoters.
  • the weight ratio of the hydroxy-terminated siloxane to the at least one silane is preferably from 2:1 to 20:1, more preferably from 5:1 to 15:1 and most preferably from 7:1 to 9:1.
  • composition may further comprise a siloxanolate of the formula:
  • M can be any monovalent metal ion, preferably an alkali metal; or an ammonium ion, preferably tetraalkylammonium, more preferably tetramethylammonium.
  • a siloxanolate comprises up to 10% wt/wt of composition, preferably 1-5%.
  • the composition may also comprise an additional chemical compound, especially of copper, iron, tin, zinc or titanium, preferably selected from the group: copper (I) acetate, copper (II) acetate, copper (II) oxide, ferric oxide, titanium dioxide, zinc oxide, zinc acetate, zinc octoate, zinc chloride, zinc bromide, titanium tetrachloride, di-n-octyltin l-benzoyl-4-methyl- 2-pentanonate 2-ethylhexanoate and di-n-octyltin 1- benzoyl-4-methyl-2-pentanonate laurate.
  • an additional chemical compound especially of copper, iron, tin, zinc or titanium
  • Such an additional compound When such an additional compound is present it constitutes typically 0.001 to 5 wt%, but more preferably 0.01 to 2 wt% of the overall composition. Transition metal compounds are especially preferred. Photocatalysts such as titanium oxide and zinc oxide are especially preferred, most preferably titanium dioxide. Such additional chemical compounds may be introduced into the composition in their particulate form, preferably having mean particle size in the range 0.001 to 1000 microns, preferably from 0.01 to 500 microns, more preferably from 0.1 to 100 microns. Titanium dioxide participates in self-cleaning by generating ions when subjected to UV light.
  • the composition may further comprise a fluoropolymer .
  • the fluoropolymer preferably leads to increased hydrophobicity of the overall composition.
  • the fluoropolymer is preferably derived from an acrylate fluoromonomer .
  • the fluoropolymer preferably comprises a fluoropolymer selected from the group including: polyfluoroalkanes (for example PTFE), polyvinylfluoride, and polymers of 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7-Dodecafluoroheptyl acrylate, 2, 2, 3, 3, 4, 4, 4-Heptafluorobutyl acrylate, 1, 1, 1, 3, 3, 3-Hexafluoroisopropyl acrylate, 2,2,3,3,4,4,5,5- Octafluoropentyl acrylate, 2,2,3,3,4,4,5,5- Octafluoropentyl methacrylate, 2, 2, 3, 3, 3-Pentafluoropropyl acrylate, 2, 2, 3, 3-Tetraflu
  • the polymer of 2, 2, 3, 3, 4, 4, 5, 5-octafluoropentyl acrylate is particularly preferred. All such fluoropolymers are readily available commercially, or easily synthesised through standard polymerisation of the respective fluoromonomers .
  • the fluoropolymer component comprises a fluoroalkyl acrylate copolymer, preferably including any of the above monomers, or copolymers of any two or more of the above species.
  • the fluoropolymer component comprises a homopolymer.
  • the fluoropolymer component preferably comprises 0.01 to 10 wt% of the antifouling composition, preferably 0.01 to 5 wt%.
  • the composition contains alkanes, preferably Cu to Ci 5 . When present these may constitute up to 65 wt% of the overall composition, but more preferably 20 to 55 wt%.
  • the alkanes comprise isoparaffinic solvent. Alkanes are believed to be solvent carriers or diluents for the siloxane polymers; as they evaporate the hydrolysis gradually increases to form the final matrix.
  • compositions may be sprayable but are preferably spreadable by means of an implement such as a roller or brush.
  • an implement such as a roller or brush.
  • a hydrophobic coating composition comprising:
  • a coated substrate wherein the coating comprises at least one layer of the composition of either of the first or second aspect.
  • the coating may comprise more than one layer of the composition.
  • the coating may be applied in one pass, or preferably one or more passes, and most preferably from two to four passes.
  • the coating may undergo further processing once applied; preferably curing in air.
  • the thickness of the final coating is preferably between 50 microns to 2000 microns, more preferably between 100 microns to 1000 microns, and most preferably between 250 microns and 650 microns.
  • a method of preparing a hydrophobic coating composition comprising mixing together a hydroxy- terminated siloxane and at least one silane to form a sprayable or spreadable composition according to either of the first or second aspect.
  • a fifth aspect of the present invention involves a method of preparing a coated substrate of the third aspect, comprising:
  • the substrate to be treated is clean (for example grease free) and without corrosion damage (for example perforations or crusting) .
  • composition is suitable for the treatment of any surface, though a surface would preferably be selected from the group: fibreglass, metal alloys (including aluminium/aluminium alloy), wood, painted surfaces, conventional antifouling paint, and rubber bitumen.
  • a surface would preferably be selected from the group: fibreglass, metal alloys (including aluminium/aluminium alloy), wood, painted surfaces, conventional antifouling paint, and rubber bitumen.
  • the method further comprises spraying or spreading the hydrophobic coating composition over the coating (s) .
  • the curing process is moisture activated in air as a result of the moisture content of the atmosphere.
  • the applied coating (s) are left for 12 hours and more preferably 24 hours to cure.
  • no more than four, and more preferably no more than two coats are applied in any one treatment program.
  • compositions may tolerate temperatures from -4O 0 C, preferably from -6O 0 C, to 500 0 C after curing. More preferably the compositions tolerate temperatures between -60°C to 280°C. Preferably the compositions substantially retain their hydrophobicity, and preferably retain their flexibility, between -60°C to 280°C.
  • a method of combating bacteria on a surface comprising preparing a coated substrate in accordance with the fifth aspect.
  • a seventh aspect of the present invention there is provided a method of protecting underwater structures, comprising preparing a coated substrate in accordance with the fifth aspect.
  • the coating prevents fouling on the underwater structures, and preferably those from the group including boats, ships, submarines, submarine oil field facilities, underwater tunnels, pipelines, jetties, breakwaters, groynes, buoys and bridges.
  • the coatings herein disclosed should last for at least 5 years, more likely at least 10 years and most likely at least 20 years.
  • fouling may be washed off by movement through the water.
  • a boat or ship may in effect become self-cleaning.
  • an eighth aspect of the present invention there is provided a method of protecting surfaces from chemical or biological contamination, comprising preparing a coated substrate in accordance with the fifth aspect.
  • an ninth aspect of the present invention there is provided a method of protecting surfaces from radioactive contamination, comprising preparing a coated substrate in accordance with the fifth aspect.
  • a method of preventing adherence of graffiti to a surface comprising preparing a coated substrate in accordance with the fifth aspect.
  • a method of protecting a substrate from degradation caused by chemicals comprising preparing a coated substrate in accordance with the fifth aspect.
  • the degradation may be corrosion.
  • the chemicals may be acidic solutions, preferably aqueous acidic solutions.
  • the aqueous acidic solutions have a pH of 5 or lower, more preferably 2 or lower, and most preferably 1 or lower. Therefore, the method preferably protects the substrate even at very low pH.
  • the method protects the substrate from corrosion by acid rain.
  • the chemicals may be alkaline solutions, preferably aqueous alkaline solutions.
  • the aqueous alkaline solutions have a pH of 9 or higher, more preferably 11 or higher, and most preferably 13 or higher.
  • the method protects the substrate from both acidic and alkaline conditions.
  • a method to prevent ice formation upon a substrate comprising preparing a coated substrate according to the fifth aspect.
  • the coated substrate is readily removable, with minimal friction, from a block of ice formed around the coated substrate when the coated substrate is partially submerged in water that is subsequently frozen.
  • the coated substrate may be an internal component of a freezer or refrigerator.
  • the internal component may be an inside surface.
  • the inside surface may include an internal wall, an internal surface of a door, or a drawer. This leads to less ice build up within the freezer, and less need for regular thawing.
  • a cooling device comprising the coated substrate of the third aspect.
  • the cooling device is a fridge or a freezer.
  • a method of increasing water repellent properties of a fabric substrate comprising preparing a coated substrate in accordance with the fifth aspect, where said substrate comprises fabric.
  • the fabric substrate may be clothing, for example a swim-suit.
  • the fabric substrate may be a coat.
  • the fabric substrate may be a tent .
  • a hydrophobic coating composition according to the first or second aspect, to combat bacteria on a surface, protect underwater structures, protect surfaces from chemical or biological contamination, protect surfaces from radioactive contamination, prevent adherence of graffiti to a surface, protect a substrate from degradation caused by chemicals, prevent ice formation upon a substrate, or increase water repellent properties of a fabric substrate.
  • a hydrophobic coating composition was made by blending the following components:
  • the components were blended and then packaged in airtight paint tins, with the intention of later brushing from the tins onto a suitable substrate, e.g. a boat hull, or conveying to a sprayer apparatus .
  • a suitable substrate e.g. a boat hull, or conveying to a sprayer apparatus .
  • Hydroxy-terminated polydimethylsiloxane has a viscosity of 500 P (50 Pa. s) and serves as the foundation of the composition and is cross-linked on curing by the various silanes present.
  • Non-hydroxy terminated polydimethylsiloxane has a viscosity of 10 P (1 Pa. s) and is a plasticizer which allows a flexible substrate coated with the above composition to be flexed without cracking the coating.
  • N-beta- (aminoethyl) -gamma- aminopropylmethyldimethoxysilane is an adhesion promoter which helps the composition initially adhere to a substrate to be coated before curing takes place.
  • the isoparaffinic solvent acts as a diluent or thinning agent to provide the composition with a consistency conducive to spreadability .
  • the thickness of a typical coat after application of two layers and curing in air is 150 to 400 microns.
  • the composition feels "slippy" and is not wetted by water: water dropped onto the coated substrate held horizontally forms beads; inclining the substrate even a small amount, e.g. 10°, causes the beads to run off the surface .
  • Coatings formed from the composition are resistant to bio-fouling in marine environments. Such fouling as does form is poorly adhered and can be quickly removed, for example, by mild rubbing or by spraying with water. Application of a second such coating, if wished, is easily achieved; the first and second coatings bond well together .
  • a hydrophobic coating composition was made by blending the following components:
  • the components were blended and the composition was then packaged in airtight paint tins, with the intention of later brushing from the tins onto a test surface to be the subject of graffiti.
  • the thickness of a typical coat after application of two layers and curing in air is 150 to 420 microns.
  • the composition feels "slippy" and is not wetted by water: water dropped onto the coated substrate held horizontally forms beads; inclining the substrate even a small amount, e.g. 10°, causes the beads to run off the surface.
  • a hydrophobic coating composition was made by blending the following components:
  • the components were blended and the composition was then packaged in airtight paint tins, with the intention of later brushing or spraying onto a hull or undersurface intallation, for example of a jetty, breakwater, buoy or bridge .
  • the thickness of a typical coat after application of two layers and curing in air is 150 to 400 microns.
  • the composition feels "slippy" and is not wetted by water: water dropped onto the coated substrate held horizontally forms beads.
  • Coatings formed from the composition are resistant to fouling. Such fouling as does form is poorly adhered and can be quickly removed, for example, by mild rubbing or by spraying with water. It is of note that the performance of the composition of this example was improved compared to that of Example 1.
  • the titanium dioxide acts as a photocatalyst in the presence of UV light, to further create a hostile environment for bacteria and thus alleviate fouling. This is believed to be the result of the localised generation of oxygen gas, especially whilst the coating is exposed to UV light such as from the sun.
  • a hydrophobic coating composition was made by blending the following components:
  • FtoneTM 105D is a fluoropolymer derived from an acrylic monomer. Compositions were also made containing equal quantities (4.0% w/w) of the polymerised adduct of 2, 2, 3, 3, 4, 4, 5, 5-octafluoropentyl acrylate (available from Sigma-Aldrich) , to the same effect. Examples of applicable polymerisation processes can be found in WO 93/20116.
  • the components were blended and the composition was then packaged in airtight paint tins, with the intention of later brushing or spraying onto a hull or undersurface intallation, for example of a jetty, breakwater, buoy or bridge .
  • the thickness of a typical coat after application of two layers and curing in air is 150 to 400 microns.
  • the composition feels "slippy" and is not wetted by water: water dropped onto the coated substrate held horizontally forms beads.
  • Coatings formed form the composition are resistant to fouling. Such fouling as does form is poorly adhered and can be quickly removed, for example, by mild rubbing or by spraying with water.
  • Compositions of this example showed improved antifouling properties over those of Example 3, suggesting that the fluoropolymer is responsible for such an augmentation.
  • Application of a second such coating, if wished, is easily achieved; the first and second coatings bond well together.
  • a hydrophobic coating composition was made by blending the following components:
  • FtoneTM 105D is a fluoropolymer derived from an acrylic monomer. Compositions were also made containing equal quantities (4.0% w/w) of the polymerised adduct of 2, 2, 3, 3, 4, 4, 5, 5-octafluoropentyl acrylate (available from Sigma-Aldrich) , to the same effect. Examples of applicable polymerisation processes can be found in WO 93/20116.
  • the components were blended and the composition was then packaged in airtight paint tins, with the intention of later brushing or spraying onto a hull or undersurface intallation, for example of a jetty, breakwater, buoy or bridge .
  • the thickness of a typical coat after application of two layers and curing in air is 150 to 400 microns.
  • the composition feels "slippy" and is not wetted by water: water dropped onto the coated substrate held horizontally forms beads.
  • Coatings formed form the composition are resistant to fouling. Such fouling as does form is poorly adhered and can be quickly removed, for example, by mild rubbing or by spraying with water.
  • Compositions of this example showed improved antifouling properties over those of Example 1, suggesting that the fluoropolymer is responsible for such an augmentation, presumably due to increased hydrophobicity .
  • Application of a second such coating, if wished, is easily achieved; the first and second coatings bond well together.
  • Each test employed two test plates; one coated using one of the compositions of Examples 1 to 5, the other uncoated as a control.
  • Each of the coated and uncoated plates of each test was exposed to bacteria by virtue of being completely submerged for 1 minute in water obtained from a roadside drain.
  • Each plate was left vertically inclined for 3 hours, so that the bulk of the water drained from the surface of even the uncoated plates.
  • the plates were also air dried at 35 0 C during this 3 hour period.
  • a swab was taken from each plate by scraping each plate along its length once with the end of a cotton bud.
  • Table 1 clearly shows that living bacteria do not readily adhere to the coated plates, unlike the uncoated plates where bacterial contamination is very high. Therefore such coated surfaces substantially combat bacteria .
  • Example 4 Table 2 demonstrates that the coated plates are effective at combating the growth of bacteria from those bacteria which did successfully adhere in the first instance. Clearly the coating of Example 4 is the most effective, as expected given the presence of titanium dioxide and a fluoropolymer .
  • examples 1 to 5 were applied to one side of a hospital door which was regularly pushed open with microbially contaminated hands, it was found that the coated surface did not support microbial growth, whereas the other uncoated side of the door, which was also regularly pushed open, did support microbial growth.
  • Such effectiveness is also applicable to any form of biological contamination, and can be extended to chemical contamination since most chemical agents will not adhere to the coated surface, but will instead run off or evaporate due to the repellent effect of the surface.
  • underwater structures are also substantially protected against fouling by virtue of the coating compositions of the present invention.
  • Example 1 Tests were conducted on the hydrophobic coating composition of Example 1 to assess the effectiveness of such a coating in protecting against radiological contamination. To this end, both coated (with one coat as described in Example 1) and uncoated (control) test pieces were submerged into highly radioactive alkaline soft sludge typical of any nuclear power or reprocessing plant.
  • Each of the coated and uncoated (control) test pieces consisted of three separate rectangular plates made from aluminium (Al) , stainless steel (SS) , and galvanised steel (GS) together with a carbon steel pipe (CSP) and a stainless steel pipe (SSP) , all attached to a holding frame to yield a 5 pronged fork.
  • All 5 prongs of the fork were coated with a single coat as outlined in Example 1.
  • the control piece had no special preparation and was representative of structures currently put into a pond, containing such radioactive sludge, in a nuclear power or reprocessing plant .
  • test pieces and corresponding sets of plates were recovered on a regular basis at the same time, and underwent washing using running water as they were withdrawn from the pond and suspended over a bay. This was carried out on a regular basis over a period of three months and the levels of radioactive contamination and radiation recorded for all materials on the test pieces, including Al, SS, GS, CSP, and SSP.
  • compositions of the present invention allows on-site decontamination which significantly saves on decontamination costs, and reduces the need to transport highly radioactively contaminated components. Furthermore, allowing items to be moved to low radiation dose areas, with minimal effort, reduces dosages to workers engaged in decontamination and storage operations, and reduces dose rates during maintenance operations. The operating life of certain equipment is also significantly extended.
  • a 2mm thick aluminium strip measuring 30cm by 3cm was coated with the coating of Example 1 to give a hydrophobically coated strip ("Strip A”) .
  • a second aluminium strip of the same dimensions was coated with a two-part epoxy resin to give an epoxy coated strip (“Strip B”) .
  • a third aluminium strip was an uncoated control strip (“Step C”) .
  • the three strips were exposed to different conditions by submerging them in acidic and alkaline aqueous solutions over various time periods. The results are tabulated below.
  • coatings of the present invention not only render metal surfaces corrosion resistant, but they even out-perform two-part epoxy resins.
  • the coatings of the invention may therefore be described as corrosion inhibitors, and could be used to prevent damage caused by acid rain on a variety of surfaces, but especially metal surfaces.
  • Such coatings provide general chemical protection, especially against highly acidic or highly alkaline (or basic) conditions.
  • Example 8 An aluminium strip as described in Example 8 was created with the coating of Example 1 to again give a coated strip as per "Strip A". The strip was then submerged into a cardboard carton filled with water before the carton containing the water and strip was placed within a freezer for 48 hours. Upon removing the carton from the freezer it was found that the strip could be easily removed from the resulting ice block without resistance. The ice therefore did not freeze onto the strip .
  • the coating is therefore highly suitable as a coating for the interior walls or interior of the drawers of a freezer or even a fridge.
  • the advantage of the coating in a freezer is that defrosting/thawing will be required less often, which is a particular advantage in the case of commercial freezers.
  • the risk of bacterial contamination within the ice is reduced because ice will not stick to the coated walls.
  • a fabric cloth was coated with the coating of Example 1.
  • the cloth was still breathable - i.e. water vapour and air could still pass through the fibres - but water resistance increased markedly. This has applications for water-proof clothes, swimwear, and even temporary fabric such as tents.
  • Example 8 Strip A of Example 8 was cooled to -60°C for 24 hours before being allowed to warm back to room temperature. The coating remained both hydrophobic and flexible.
  • the strip was then heated to 280°C for 4 hours before allowing the strip to cool back to room temperature.
  • the coating remained hydrophobic and flexible

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

L’invention concerne une composition de revêtement hydrophobe qui, une fois appliquée à une surface, empêche ou réduit la contamination de la surface. La composition comprend un silane et un siloxane à terminaison hydroxy.
PCT/GB2009/050572 2008-05-28 2009-05-27 Composition de revêtement hydrophobe WO2009144495A2 (fr)

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GB0809629A GB0809629D0 (en) 2008-05-28 2008-05-28 Hydrophobic coating composition
GB0809629.9 2008-05-28

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WO2009144495A2 true WO2009144495A2 (fr) 2009-12-03
WO2009144495A3 WO2009144495A3 (fr) 2010-03-18

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012083011A1 (fr) * 2010-12-15 2012-06-21 Battelle Memorial Institute Surface résistante aux salissures biologiques
DE102014213327A1 (de) * 2014-07-09 2016-01-14 MTU Aero Engines AG Anti-fouling-Schicht für Verdichterschaufeln
WO2016077573A1 (fr) * 2014-11-12 2016-05-19 University Of Houston System Revêtements résistant aux intempéries, aux champignons et aux taches et procédés d'application sur bois, maçonnerie ou autres matériaux poreux
US9670375B1 (en) 2015-12-30 2017-06-06 King Fahd University Of Petroleum And Minerals Crumb rubber coating with a hydrophobic surface
US9782956B2 (en) 2011-12-28 2017-10-10 Saint-Gobain Performance Plastics Corporation Polymer coating on substrates using thermal spray techniques
US9803690B2 (en) 2012-09-28 2017-10-31 Saint-Gobain Performance Plastics Pampus Gmbh Maintenance-free slide bearing with a combined adhesive sliding layer
US9981284B2 (en) 2011-12-28 2018-05-29 Saint-Gobain Performance Plastics Corporation Method of forming a laminate
US10065448B2 (en) * 2014-06-04 2018-09-04 Ryan M. Stewart Creation of a three dimensional liquid art on a surface by utilizing a super hydrophobic coating
US10113588B2 (en) 2012-06-29 2018-10-30 Saint-Gobain Performance Plastics Pampus Gmbh Slide bearing comprising a primer system as adhesion promoter
CN109893269A (zh) * 2019-03-15 2019-06-18 温州医科大学附属口腔医院 一种减少细菌附着率的牙合垫
US10704191B2 (en) 2014-11-12 2020-07-07 University Of Houston System Soil-resistant, stain-resistant coatings and methods of applying on textile or other flexible materials
US11118352B2 (en) 2017-12-20 2021-09-14 Certainteed Llc Microbial growth and dust retardant roofing shingles
US11142867B2 (en) 2014-11-12 2021-10-12 University Of Houston System Soil-resistant, stain-resistant fluorine-free coatings and methods of applying on materials
US20220041258A1 (en) * 2020-08-07 2022-02-10 Roger K. Young Coatings that reduce or prevent barnacle attachment to a marine structure
US11298721B2 (en) * 2015-09-18 2022-04-12 International Business Machines Corporation Pre-treating polymer tubing or hose with a hydrophobic coating to reduce depletion of corrosion inhibitor

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EP0851009A2 (fr) * 1996-12-24 1998-07-01 Matsushita Electric Works, Ltd. Composition de revêtemnt antiadhésive et anti-fouling et articles revêtus
WO2001094487A2 (fr) * 2000-06-02 2001-12-13 Microphase Coatings, Inc. Composition de revetement antisalissure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851009A2 (fr) * 1996-12-24 1998-07-01 Matsushita Electric Works, Ltd. Composition de revêtemnt antiadhésive et anti-fouling et articles revêtus
WO2001094487A2 (fr) * 2000-06-02 2001-12-13 Microphase Coatings, Inc. Composition de revetement antisalissure

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012083011A1 (fr) * 2010-12-15 2012-06-21 Battelle Memorial Institute Surface résistante aux salissures biologiques
US9981284B2 (en) 2011-12-28 2018-05-29 Saint-Gobain Performance Plastics Corporation Method of forming a laminate
US9782956B2 (en) 2011-12-28 2017-10-10 Saint-Gobain Performance Plastics Corporation Polymer coating on substrates using thermal spray techniques
US10563696B2 (en) 2012-06-29 2020-02-18 Saint-Gobain Performance Plastics Pampus Gmbh Slide bearing comprising a primer system as adhesion promoter
US10113588B2 (en) 2012-06-29 2018-10-30 Saint-Gobain Performance Plastics Pampus Gmbh Slide bearing comprising a primer system as adhesion promoter
US9803690B2 (en) 2012-09-28 2017-10-31 Saint-Gobain Performance Plastics Pampus Gmbh Maintenance-free slide bearing with a combined adhesive sliding layer
US10065448B2 (en) * 2014-06-04 2018-09-04 Ryan M. Stewart Creation of a three dimensional liquid art on a surface by utilizing a super hydrophobic coating
DE102014213327A1 (de) * 2014-07-09 2016-01-14 MTU Aero Engines AG Anti-fouling-Schicht für Verdichterschaufeln
US9540522B2 (en) 2014-07-09 2017-01-10 MTU Aero Engines AG Antifouling layer for compressor blades
US10704191B2 (en) 2014-11-12 2020-07-07 University Of Houston System Soil-resistant, stain-resistant coatings and methods of applying on textile or other flexible materials
AU2015346315B2 (en) * 2014-11-12 2020-01-30 University Of Houston System Weather-resistant, fungal-resistant, and stain-resistant coatings and methods of applying on wood, masonry, or other porous materials
WO2016077573A1 (fr) * 2014-11-12 2016-05-19 University Of Houston System Revêtements résistant aux intempéries, aux champignons et aux taches et procédés d'application sur bois, maçonnerie ou autres matériaux poreux
US11142867B2 (en) 2014-11-12 2021-10-12 University Of Houston System Soil-resistant, stain-resistant fluorine-free coatings and methods of applying on materials
US11345821B2 (en) 2014-11-12 2022-05-31 University Of Houston System Weather-resistant, fungal-resistant, and stain-resistant coatings and methods of applying on wood, masonry, or other porous materials
US11298721B2 (en) * 2015-09-18 2022-04-12 International Business Machines Corporation Pre-treating polymer tubing or hose with a hydrophobic coating to reduce depletion of corrosion inhibitor
US9873816B2 (en) 2015-12-30 2018-01-23 King Fahd University Of Petroleum And Minerals Crumb rubber coating composition and method for protecting a surface
WO2017115119A1 (fr) 2015-12-30 2017-07-06 King Fahd University Of Petroleum And Minerals Revêtement de caoutchouc granulaire à surface hydrophobe
US9670375B1 (en) 2015-12-30 2017-06-06 King Fahd University Of Petroleum And Minerals Crumb rubber coating with a hydrophobic surface
US11118352B2 (en) 2017-12-20 2021-09-14 Certainteed Llc Microbial growth and dust retardant roofing shingles
CN109893269A (zh) * 2019-03-15 2019-06-18 温州医科大学附属口腔医院 一种减少细菌附着率的牙合垫
US20220041258A1 (en) * 2020-08-07 2022-02-10 Roger K. Young Coatings that reduce or prevent barnacle attachment to a marine structure
US11964739B2 (en) * 2020-08-07 2024-04-23 Roger K. Young Coatings that reduce or prevent barnacle attachment to a marine structure

Also Published As

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