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WO2018067859A1 - Systèmes de revêtement protecteur pour cabines de peinture résistant à la décoloration - Google Patents

Systèmes de revêtement protecteur pour cabines de peinture résistant à la décoloration Download PDF

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Publication number
WO2018067859A1
WO2018067859A1 PCT/US2017/055402 US2017055402W WO2018067859A1 WO 2018067859 A1 WO2018067859 A1 WO 2018067859A1 US 2017055402 W US2017055402 W US 2017055402W WO 2018067859 A1 WO2018067859 A1 WO 2018067859A1
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Prior art keywords
painting
composition
over
heating operations
percent
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PCT/US2017/055402
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English (en)
Inventor
Robert Louis Mesa
Edward William Woodhall
Brian Ming Wong
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Cal-West Specialty Coatings Inc
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Cal-West Specialty Coatings Inc
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Publication of WO2018067859A1 publication Critical patent/WO2018067859A1/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
    • C09D5/20—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films
    • 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
    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/02—Homopolymers or copolymers of unsaturated alcohols
    • C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

Definitions

  • paint booths or spray booths In many industrial applications and/or collision repair shops, painting (or other overcoating) operations are carried out in facilities often referred to as paint booths or spray booths.
  • a paint booth is a partially or fully enclosed structure typically capable of being heated to high temperatures, and it typically contains interior surfaces made of coated metal or other heat resistant materials. Paint operations are conducted in paint booths in order to contain paint overspray produced during the painting operation as well as to provide a controlled environment for curing paint finishes. During painting operations, paint booth surfaces are often contaminated with paint overspray, making the interior surfaces of the paint booth difficult and time consuming to clean.
  • paint overspray builds up on the walls, floor gratings and other structures of the booth. Likewise, paint overspray accumulates on conveyors, racks and other equipment which transports articles through a paint spray facility. It is necessary to periodically remove built up paint overspray. Cleaning the unprotected walls of a paint booth can require some level of restoration and refinishing of the walls, often taking a day or more to accomplish, and resulting in significant booth downtime.
  • Adhesive coated plastic sheets have been employed to cover paint booth surfaces. These plastic sheets are difficult to install and the installation results in many wrinkles which tend to collect and hold paint overspray and other contaminants that in turn are easily dislodged during painting. As previously described, these dislodged particulates can cause paint dust and lead to defects in the paint coating.
  • the adhesive bond of the plastic sheets to the booth surfaces builds with time and through repeated bake cycles, making the construction difficult or impossible to remove cleanly without slivering of the film or without adhesive residue.
  • the protective sheet is prone to peeling or falling off the wall prematurely due to insufficient adhesion particularly when subjected to multiple bake cycles.
  • masking papers have been employed, and while stiff and somewhat easier to handle than plastic sheets, they lack flexibility and extensibility to easily fit over or around protrusions or obstacles. Paper is also subject to tearing which produces small fibers that can contribute to contamination.
  • Sprayable polymeric coatings are another material that has been employed to cover paint booth surfaces. However, under painting operations and repeated baking cycles these coatings have tended to discolor and/or to bond to the wall after relatively short exposure cycles which renders them unremovable.
  • protective coatings for paint booths are provided that can be applied to the walls and/or floor of the paint booth as a liqud that dries to a durable, white, peelable coating that affords signifcant protection to the underlying surface (e.g., spraybooth walls or floor) and that can readily be peeled off the underlying surface when desired.
  • the coating described herein shows improved resistance to discoloration (e.g., yellowing) as compared to other protective coatings.
  • peelable coating compositions using a polyvinylbutyral (PVB) as a film fomer and titanium dioxide (Ti0 2 ) as a white pigment showed significantly greater resistance to discoloring over time/usage when the titanium dioxide was a sulfate process titanium dioxide rather than a chloride process titanium dioxide.
  • the effect was particularly significant when the polyvinylbutyral was a recycled polyvinylbutyral.
  • Various embodiments contemplated herein may include, but need not be limited to, one or more of the following:
  • Embodiment 1 A protective coating composition for the temporary protection of a paint spray booth comprising:
  • liquid film former that when applied to a surface and dried forms a peelable film
  • said liquid film former comprises a polyvinylbutyral (PVB)
  • pigment wherein said pigment comprises a sulfate process rutile titanium dioxide
  • said protective coating composition is more resistant to yellowing than the same composition when formulated with a chloride process titanium dioxide.
  • Embodiment 2 The composition of embodiment 1, wherein said polyvinyl butyal comprises a recycled PVB resin.
  • Embodiment 3 The composition according to any one of embodiments 1-2, wherein said composition, when dried to a protective peelable coating, yellows significant less over time in use in an automobile paint booth subject to painting operations and heating cycles than the same composition formulated with a chloride process titanium dioxide.
  • Embodiment 4 The composition of embodiment 3, wherein said composition, when dried to a protective peelable coating, yellows significantly less than the same composition formulated with a chloride process titanium dioxide, when in use in an automobile paint booth subject to painting operations and heating cycles over at least 5 painting and heating operations, or over at least 10 painting and heating operations, or over at least 15 painting and heating operations, or over at least 20 painting and heating operations, or over at least 25 painting and heating operations, or over at least 30 painting and heating operations, or over at least 35 painting and heating operations, or over at least 40 painting and heating operations, or over at least 45 painting and heating operations, or over at least 50 painting and heating operations, or over at least 60 painting and heating operations, or over at least 70 painting and heating operations, or over at least 80 painting and heating operations, or over at least 90 painting and heating operations, or over at least 100 painting and heating operations.
  • Embodiment 5 The composition according to any one of embodiments 1-4, wherein said composition, when dried to a protective peelable coating, shows at least 10%, or at least 20%, or least 30%, or at least 40%, or at least 50%, or at least 60%, or at least 70%), or at least 80%, or at least 90% less yellowing over time in use in an automobile paint booth subject to painting operations and heating cycles than the same composition formulated with a chloride process titanium dioxide.
  • Embodiment 6 The composition according to any one of embodiments 1-5, wherein said composition, when dried to a protective peelable coating, shows at least 50% less yellowing over time in use in an automobile paint booth subject to painting operations and heating cycles than the same composition formulated with a chloride process titanium dioxide.
  • Embodiment 7 The composition of embodiment 6, wherein said
  • composition when dried to a protective peelable coating, shows at least 50% less yellowing than the same composition formulated with a chloride process titanium dioxide, when in use in an automobile paint booth subject to painting operations and heating cycles over at least 5 painting and heating operations, or over at least 10 painting and heating operations, or over at least 15 painting and heating operations, or over at least 20 painting and heating operations, or over at least 25 painting and heating operations, or over at least 30 painting and heating operations, or over at least 35 painting and heating operations, or over at least 40 painting and heating operations, or over at least 45 painting and heating operations, or over at least 50 painting and heating operations, or over at least 60 painting and heating operations, or over at least 70 painting and heating operations, or over at least 80 painting and heating operations, or over at least 90 painting and heating operations, or over at least 100 painting and heating operations.
  • Embodiment 8 The composition according to any one of embodiments 1-3, wherein said composition, when dried to a protective peelable coating, substantially no yellowing in use in an automobile paint booth subject to painting operations and heating cycles over at least 5 painting and heating operations, or over at least 10 painting and heating operations, or over at least 15 painting and heating operations, or over at least 20 painting and heating operations, or over at least 25 painting and heating operations, or over at least 30 painting and heating operations, or over at least 35 painting and heating operations, or over at least 40 painting and heating operations, or over at least 45 painting and heating operations, or over at least 50 painting and heating operations, or over at least 60 painting and heating operations, or over at least 70 painting and heating operations, or over at least 80 painting and heating operations, or over at least 90 painting and heating operations, or over at least 100 painting and heating operations.
  • Embodiment 9 The composition according to any one of embodiments 1-8, wherein said polyvinyl butytral comprises about 25 wt percent to about 90 wt percent of said composition before drying.
  • Embodiment 10 The composition according to any one of embodiments 1- 9, wherein said pigment comprise about 1 wt percent up to about 15 wt percent of said composition.
  • Embodiment 11 The composition according to any one of embodiments 1-
  • composition comprises a surfactant
  • Embodiment 12 The composition of embodiment 11, wherein said surfactant comprises a surfactant selected from the group consisting of a non-ionic surfactant, a cationic surfactant, an anionic surfactant, and an amphoteric surfactant.
  • a surfactant selected from the group consisting of a non-ionic surfactant, a cationic surfactant, an anionic surfactant, and an amphoteric surfactant.
  • Embodiment 13 The composition of embodiment 11, wherein said surfactant comprises an ethoxylated alcohol surfactant.
  • Embodiment 14 The composition according to any one of embodiments 11- 13, wherein said surfactant comprises about 0.1 wt percent up to about 3 wt percent of said composition before drying.
  • Embodiment 15 The composition according to any one of embodiments 1-
  • Embodiment 16 The composition of embodiment 15, wherein said thickener is selected from the group consisting of a cellulose, a cellulose derivative, a natural clay, a synthetic clay, a silicone based thickener, an acrylic emulsion thickener, a latex paint associative thickener, a xanthan gum, and an acrylic copolymer thickener.
  • said thickener is selected from the group consisting of a cellulose, a cellulose derivative, a natural clay, a synthetic clay, a silicone based thickener, an acrylic emulsion thickener, a latex paint associative thickener, a xanthan gum, and an acrylic copolymer thickener.
  • Embodiment 17 The composition of embodiment 15, wherein said thickener comprises a xanthan gum.
  • Embodiment 18 The composition according to any one of embodiments 15-
  • said thickener comprises about 0.1 wt percent up to about 3 wt percent of said composition before drying.
  • Embodiment 19 The composition according to any one of embodiments 1- 18, wherein said composition comprises a coalescent.
  • Embodiment 20 The composition of embodiment 19, wherein said coalescent comprise an alcohol ester.
  • Embodiment 21 The composition of embodiment 19, wherein said coalescent comprises trimethylpentanediol monoisobutyrate.
  • Embodiment 22 The composition according to any one of embodiments 19-
  • coalescent comprises about 0.01 wt percent up to about 3 wt percent of said composition before drying.
  • Embodiment 23 The composition according to any one of embodiments 1-
  • Embodiment 24 The composition of embodiment 23, wherein said defoamer is a silicon based defoamer.
  • Embodiment 25 The composition according to any one of embodiments 23-
  • Embodiment 26 The composition according to any one of embodiments 1-
  • composition comprises a biocide
  • Embodiment 27 The composition of embodiment 26, wherein said biocide comprises one or more biocides selected from the group consisting of PROXEL GXL® (an aqueous solution of l,2-benzisothiazolin-3-one), and KATHON LX® a combination of 5- chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one.
  • biocides selected from the group consisting of PROXEL GXL® (an aqueous solution of l,2-benzisothiazolin-3-one), and KATHON LX® a combination of 5- chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one.
  • Embodiment 28 The composition according to any one of embodiments 26-
  • biocide comprises about a biocide comprises up to about 2 wt percent of said composition before drying.
  • Embodiment 29 The composition according to any one of embodiments 1- 8, wherein: said film former comprises about 25 wt percent to about 90 wt percent of said composition before drying; said sulfate process rutile titanium dioxide pigment comprises about 1 wt percent to about 20 wt percent of said composition before drying;_a surfactant comprises up to about 1 wt percent of said composition before drying; a thickener comprises up to about 1 wt percent of said composition before drying; a coalescent comprises up to about 3 wt percent of said composition before drying; a defoamer comprises about 0.1 wt percent to about 2 wt percent of said composition before drying; and a biocide comprises up to about 2% of said composition before drying.
  • Embodiment 30 The composition of embodiment 26, wherein said composition comprises: about 66.4 wt percent recycled polyvinylbutyral disperson; about 12 wt percent sulfate process rutile titanium dioxide pigment; _about 0.5 wt percent surfactant; about 0.275 wt percent thickener; about 0.1 wt percent coalescent; about 0.5 wt percent defoamer; and about 0.25 wt percent biocide.
  • Embodiment 31 A spray booth, said spray booth comprising one or more surfaces therein having dried thereon a composition according to any one of embodiments 1-30, wherein said first component is dried to form a peelable white film.
  • Embodiment 32 The spray booth of embodiment 31, wherein said one or more surfaces comprises a wall.
  • Embodiment 33 The spray according to any one of embodiments 31-32, wherein said one or more surfaces comprises a floor.
  • Embodiment 34 The spray according to any one of embodiments 31-33, wherein said one or more surfaces comprises a ceiling.
  • Embodiment 35 The spray according to any one of embodiments 31-34, wherein said one or more surfaces comprises a bench top.
  • Embodiment 36 A method of preparing a spray booth for use, said method comprising:
  • Embodiment 37 A kit comprising a composition for the temporary protection of a paint spray booth, said kit comprising: a container containing a composition according to any one of embodiments 1-30. BRIEF DESCRIPTION OF THE DRAWINGS
  • polymeric coatings are provided for the protection of paint booth walls and/or floors.
  • the coatings when applied to a surface of a paint booth, dry on that surface to form a white, peelable protective coating.
  • the surfaces to be protected may be a vertical surface such as a wall, or a horizontal surface, such as a floor, ceiling, light fixture, a bench top, or any other surface that it is desired to protect.
  • the coatings described herein utilize a polyvinylbutyral (PVB) which is often a recycled polyvinylbutyral as a film former and titanium dioxide (Ti0 2 ) as a pigment to give the dry peelable coating a white color. It was observed however that various coating formulations showed undesirable discoloration (e.g., yellowing) over time and usage in paint booths. Often the coatings have developed a noticeable yellow tint in a matter of days after application and users have reported the color change as "unsatisfactory”. [0051] The discoloration is most frequently observed and pronounced when the composition is formulated using recycled PVB resin.
  • Recycled PVB is produced, inter alia, by taking used safety glass, removing the glass from the PVB inner film and reprocessing the inner film back into a usable product.
  • the reprocessors at this time have not found an economical way of guaranteeing the chemical makeup or the chemical balance of the chemicals present in the resultant product. Chemical makeup depends on the original maker of the interlayer of film in the glass. To date the sequestering of used donor glass by OEM has not been a priority with the producers of the recycled resin.
  • compositions that show markedly improved consistency and usability and, particularly where recycled PVB resin is utilized, at significantly lower cost are applied to spray booth walls. However, it is contemplated that any spray booth surface can be so treated. Thus, in certain embodiments, counters, light fixtures, and/or spray booth floors may also be so coated and protected.
  • the peelable coatings on walls, ceilings, and/or other surfaces in a paint booth makes these surfaces smooth so contaminants cannot accumulate.
  • the consistent white coating is advantageous on walls where the preexisting finish has been neglected, suffers from overspray and/or other discoloration, and is possibly excessively rough due to extensive overspray buildup, because application of the white coatings described herein can restore the appearance of the wall as though it were newly painted, and thus eliminate the need to repaint the booth.
  • the white coatings also improve illumination and facilitate matching of paint colors and detection of blemishes.
  • the protective coatings described herein can be packaged and marketed alone or they can be combined with other components (e.g., floor scrim, dust suppression coatings and the like (see, e.g., U.S. Patent Pub. No: 2014/0158043, which is incorporated herein by reference for the multi-component kits described therein).
  • a kit can comprise a container containing the peelable coating compositions described herein and, optionally instructional materials teaching the use of such compositions and/or optionally apparatus or devices for the application of the coating compositions to a surface of or in a paint spray booth.
  • kits are provided where the kit comprises a first container containing peelable film forming composition described herein and a second container containing a second component such as a particle/dust suppression formulation.
  • the kit can optionally comprise sheets or rolls of a floor covering material.
  • the kits optionally include instructional materials provided on an insert, instruction book, and/or printed on kit packaging.
  • the instructional materials typically teach the use of each of the components of the kit (e.g. use of the peelable coating compositions described herein) to protect spray booths.
  • the instructional materials can also, optionally, provide material safety information regarding the various components of the multi-component system.
  • instructional materials typically comprise written or printed materials they are not limited to such. Any medium capable of storing such instructions and communicating them to an end user is contemplated by this invention. Such media include, but are not limited to electronic storage media (e.g., magnetic discs, tapes, cartridges, chips), optical media (e.g., CD ROM), and the like. Such media may include addresses to internet sites that provide such instructional materials.
  • electronic storage media e.g., magnetic discs, tapes, cartridges, chips
  • optical media e.g., CD ROM
  • Such media may include addresses to internet sites that provide such instructional materials.
  • compositions described herein are designed provide a simple, efficient, effective, and environmentally friendly method to (1) protect booth walls, ceiling, windows, floor and lights and other surfaces from paint and solvent overspray, dirt, and other contaminants, and (2) to improve and maintain optimal lighting conditions that allow the painter to see better, which in turn, allows for better paint application and color matching between old and new painted surfaces of, e.g., the car.
  • compositions described herein comprise a polyvinylbutyral resin as a film former and sulfate process titanium dioxide as a white pigment.
  • the composition can be applied to a surface and dried (or otherwise "cured") to form a peelable protective coating on that surface.
  • the coating composition additionally includes a surfactant, and/or a thickener, and/or a coalescent, and/or a defoamer, and/or a biocide, e.g., as described below.
  • the various formulations of the peelable coating composition can, optionally, omit the surfactant, particularly where the spray booth is fabricated from a material that is easily wet by the coating composition.
  • the composition can further comprise a release agent to facilitate easy peeling.
  • the compositions described herein are typically aqueous formulations and thus will typically comprise water in addition to the various agents described herein.
  • compositions peelable formulation
  • Table 1 Illustrative formulations of the composition (peelable formulation) are shown in Table 1, below. These formulations are intended to be illustrative and not limiting. Using the teaching provided herein, numerous other variants on the formulation will be available to one of skill in the art.
  • Table 1 Illustrative, but non-limiting formulation for a peelable white paint booth protective coating that resists discoloration.
  • compositions are formulated simply by mixing the components as indicated in the Table.
  • the film former utilized in the protective compositions described herein comprise a polyvinylbutyral (PVB).
  • the polyvinylbutyral is typically provided as an aqueous dispersion or emulsion or as a water-compatible dispersions or emulsions.
  • the polyvinyal butyral film former can comprise a single polyvinylbutyral or a mixture of polyvinylbutyrals.
  • Such polyvinylbutyrals typically have a molecular weight in a range from about 3000 to about 800,000, or from about 4,000 to about 700,000, or most preferably from about 5,000 or about 10,000 to about 400,000 or about 500,000.
  • Polyvinylbutyral resin emulsions/dispersions are commercially available from a number of suppliers (e.g., Synpol resins from Synpol Products Private Limited Ahmedabad, kann, Palmer Holland, Inc. (Ohio, USA), Mil-Spec Industries, Inc., (Glen Cover, NY, USA), and the like).
  • polyvinylbutyral resin is a recycled polyvinylbutyral resin.
  • Recycled PVB resin dispersions are typically produced from used safety glass, by removing the glass from the PVB inner film and reprocessing the inner film back into a usable product.
  • the reprocessors at this time have not found a way of guaranteeing the chemical makeup or the chemical balance of the chemicals present in the resultant product. Chemical makeup depends on the original maker of the interlayer of film in the glass. To date the sequestering of used donor glass by OEM has not been a priority with the producers of the recycled resin.
  • the coating compositions described herein will simply utilize PVB (in certain embodiments, especially recycled PVB) as the film former, however, in certain other embodiments the coating composition can be formulated with other film formers as an alternative, or in combination with the polyvinylbutyral film former.
  • Additional film formers suitable for use, alone or in combination with PVB, in the formulations include, but are not limited to vinyl-acrylic copolymers, ethylene vinyl acetates, vinyl chloride copolymers, acrylic latex (e.g., 1324, B.F. Goodrich), acrylic copolymer emulsions (e.g., HYCARTM 2679, Noveon), styrene acrylic copolymers (e.g., CARBOSET 958, Noveon), polyvinyl acetate emulsions (e.g., VINAC® XX series emulsions from Air Products), and the like.
  • vinyl-acrylic copolymers ethylene vinyl acetates, vinyl chloride copolymers
  • acrylic latex e.g., 1324, B.F. Goodrich
  • acrylic copolymer emulsions e.g., HYCARTM 2679, Noveon
  • styrene acrylic copolymers
  • the film former(s) comprise from about 10 wt percent to about 95 wt percent of the composition. In certain embodiments the film former(s) comprise from about 15%, 20%, or about 25% by weight, up to about 70%, or up to about 80%), or up to about 90%, by weight of the composition before drying. In certain embodiments the film former comprises between about 60% and about 80%, or between about 65% or about 70% of the composition. In certain embodiments the film former comprises about 66.5 wt percent of the composition. Weight percent of the film former is given as weight percent of the wet dispersion/emulsion, not dry weight of the resin powder.
  • Titanium dioxide pigment The Titanium dioxide pigment.
  • the protective compositions described herein comprise a sulfate process rutile titanium dioxide (Ti0 2 ) pigment to provide a white color to the peelable film.
  • the white color improves the quality and intensity of ambient light available to the painter facilitating the detection of blemishes, the matching of paint colors and the like.
  • the pigment may also contribute to long term chemical stability of the composition through ultraviolet- blocking.
  • the pigment can contribute to mechanical strength and stability of the composition (when dried as a film) by acting as a filler.
  • the pigment can help to decrease the water sensitivity of the composition.
  • Titanium dioxide (Ti0 2 ) is generally made by one of two processes, the sulfate process and the chloride process which generally use the two principal ores, ilmenite and rutile, respectively.
  • Ilmenite typically contains about 45%-60% Ti0 2
  • rutile typically contains up to 99% Ti0 2 . Both processes produce the titanium dioxide in the rutile crystal form.
  • the sulfate process for the preparation of Ti0 2 typically involves three main stages: 1) dissolving the ore (typically in sulfuric acid); 2) formation of hydrated titanium dioxide; and 3) formation of anhydrous titanium dioxide.
  • the ore is typically ilmenite (FeTiC ) which is ground treated (digested) with an excess (e.g. a 60% excess) of concentrated sulfuric acid typically at a temperature around 100 °C. The following reaction takes place:
  • the waste product iron(II)sulfate is removed.
  • FeS0 4 is not very soluble at low temperatures, the solution is cooled (e.g., to around 15 °C) and FeS0 4 crystallises out. It can then readily be removed by filtration. The remaining aqueous digestion products are heated (e.g., to around 1 10 °C) in order to hydrolyse the titanium oxygen sulphate.
  • the hydrolysis stage of the process produces sulfuric acid waste and a precipitate gel containing hydrated titanium dioxide.
  • the hydrated titanium dioxide is heated in large rotary kilns to drive off the water and produce crystals of anatase or rutile (2 forms of titanium dioxide):
  • Water is removed at temperatures typically between 200°C-300°C. Seed crystals are added to start the crystallization process. Depending on the final heating temperature (800-850°C or 900-930 °C), either anatase or rutile is formed, respectively. After cooling, the product is milled to form crystals of the size needed.
  • the crystals may also be coated with another substance, such as aluminum oxide or silica, to make the titanium dioxide mix more easily with liquids or to make the water-based paints made from it last longer.
  • This coating is achieved by dispersing the dry product from the calciner in water containing the dissolved coating chemicals which precipitate from solution onto the Ti0 2 crystals. When present, the coating is usually between 3 and 8% by weight in the final dried pigment. This coating can be achieved by changing the temperature and pH of the solution. When a coating is present, it is desirable that each Ti0 2 crystal is coated uniformly to maximize the effectiveness of the coating.
  • the coated Ti0 2 crystals are filtered from the water and dried before being packed.
  • the chloride process involves 1) a) the conversion of rutile to titanium(IV) chloride (typically by reaction with chlorine); and 2) the oxidation of titanium(IV) chloride.
  • sulfate rutile titanium or “sulfate rutile titanium dioxide” refer to a rutile form of titanium dioxide (Ti0 2 ) made using the sulfate process (e.g., a process that typically involves dissolving the starting ore in sulfuric acid).
  • chloride rutile titanium or “chloride rutile titanium dioxide” refers to a rutile form of titanium dioxide (Ti0 2 ) made using the chloride process (e.g., a process that typically involve reaction of the starting ore with chlorine).
  • the sulfate process rutile titanium dioxide (Ti0 2 ) pigment is present at about 1% (wt percent) up to about 30% (wt percent) or up to about 20% (wt percent), or about 1% or 2% to about 12% or 15%, or about 8% to about 15% (e.g., about 12%) by weight, of the composition before drying.
  • the protective coating compositions described herein optionally include one or more surfactants.
  • the surfactants can improve wetting of the underlying surface when the coating composition is first applied and/or can enhance peelability of dried film.
  • Suitable surfactants include ionic surfactants (cationic or anionic), nonionic surfactants, amphoteric surfactants, and the like.
  • nonionic surfactants include various ethoxylated alcohols
  • ethoxylated alcohols include but are not limited to monoethers of polyethylene glycols and long chain alkanols in which the alkanol has 10 to 16 carbon atoms and the polyethylene glycol has 5 to 15 oxy ethylene units.
  • monoethers of polyethylene glycol are generally made by reacting the alkanol with ethylene oxide.
  • nonionic surfactants are well known to those of skill in the art and are commercially available. For example, commercially available TOMADOL® 25-7, a nonionic surfactant, is an adduct of 7 mols of ethylene oxide and 1 mol of a mixture of alkanols of 12 to 15 carbon atoms.
  • alcohol ethoxylate comprises RHODASURF® TDA-8.5 available from Rhodia in Cranbury, N.J. (USA).
  • Ionic surfactants include anionic and cationic surfactants.
  • Suitable anionic surfactants are well known to those of skill in the art and include, but are not limited to various carboxylates, N-acylsarcosinates, acylated protein hydrolysates including various sulfonates, ethoxylated and/or sulfonated alkylphenols, and the like.
  • Cationic surfactants are also well known to those of skill in the art and include, but are not limited to aliphatic mono-, di- and polyamines derived from fatty and rosin acids, quaternary ammonium salts, and the like.
  • Suitable amphoteric surfactants include, but are not limited to, the alkylbetaines, alkyldimethylamines, amphoteric imidazolinium derivatives, and the like.
  • the surfactant comprises TOMADOL® 25-3,
  • TOMADOL® 25-7 (Tomah, Inc.), RHODAPLEX® CO 436, sodium dodecyl sulfate, dioctylsodiumsulfosuccinate (e.g., ACROSOL® OT-75), STEOL® CA-460, or STEOL® CS-460, and the like.
  • TRITON® X-100 (Ci 4 H 22 0(C 2 H 4 0)n where the average number of ethylene oxide units per molecule is around 9 or 10) and surfactants having fluorinated alkyl chains such as "FLUORAD®” products sold by Minnesota Mining and Manufacturing (St. Paul, Minnesota, U. S.A.) and "ZONYL®” products sold by DuPont Company (Wilmington, Delaware, U.S.A.) are also suitable.
  • FLUORAD® Minnesota Mining and Manufacturing
  • ZONYL® ZONYL® products sold by DuPont Company
  • embodiments can include polyethoxy adducts or modified (poly)ethoxylates such as TRITON® DF-12 and DF-16 sold by Union Carbide (Danbury, Connecticut, U.S.A.).
  • Other surfactants include nonylphenoxypolyethanol (such as IGEPAL CO-660 made by GAF), polyoxyalkylene glycol (such as MACOL® 18 and 19 made by Mazer Chemicals), acetylenic diol -based surfactants (such as SURFYNOL® 104 made by Air Products), and the like.
  • the surfactant(s) comprise one or more silicone
  • Such surfactants include, but are not limited to silicone polyoxyalkylene copolymers, organosilicone-polyether copolymer surfactants, and the like.
  • Such surfactants include, but are not limited to various dimethicone surfactants such as PEG- 1 1 methyl ether dimethicone (e.g., GRANSURF® 71 ), PEG- 10 dimethicone (e.g., GRANSURF® 77), stearoxymethicone/dimethicone copolymer (e.g., GRANSIL® ST-9), and the like.
  • preferred siloxane-based surfactants include BYK® surfactants (e.g., BYK-345, BYK346, BYK-347, BYK-348, and the like) available from BYK Chemie GmbH (West Germany).
  • BYK® surfactants e.g., BYK-345, BYK346, BYK-347, BYK-348, and the like
  • Other silicone surfactants can be identified for example in Hill (1999) Silicon Surfactants, Marcel Decker, New York.
  • the surfactant comprises a linear fatty alcohe3ol ether sulfate (e.g., CH 3 (CH 2 )ioCH 2 (OCH 2 CH 2 ) 3 0S0 3 NH 4 available as STEOL® CA-460 from Stepan).
  • a linear fatty alcohe3ol ether sulfate e.g., CH 3 (CH 2 )ioCH 2 (OCH 2 CH 2 ) 3 0S0 3 NH 4 available as STEOL® CA-460 from Stepan).
  • the surfactant comprises an ethoxylated alcohol surfactant (e.g., Tomadol 91-6).
  • the total surfactant comprises up to about 1% of compositions described herein before drying.
  • the surfactant when present comprises between about 0.01% to about 3% (wt percent) or about 0.1 percent up toa bout 2% (wt percent) or about 0.1 percent up to about 1% (wt percent) of the
  • the surfactant is present at about 0.5% (wt percent) of the composition before drying.
  • the protective coating compositions described herein optionally include one or more thickeners.
  • any thickener preferably water soluble or water-compatible thickeners can be utilized. Certain preferred thickeners show little or no water sensitivity.
  • Thickening agents are well known to those of skill in the art and include, but are not limited to, natural product thickeners such as cellulose, cellulose derivatives (e.g., hydroxy cellulose, methylcellulose, hydroxy ethylcellulose, hydroxymethylcellulose, etc.), starch or modified starches, dextrins, xanthan gums, and the like.
  • Suitable commercial thickeners well known to those of skill in the art include, but are not limited to, Montmorillonite, EZ- 1 , BFG, Aery solTM (e.g ACRYSOL® RM 825, ACRYSOL® RM-W8, ACRYSOL® RM-W12, and the like), RHEOLATE® (e.g., RHEOLATE® 450, Rheox Co.), OPTIFLO® (e.g., OPTIFLO® TVS, OPTIFLO® H600, from Sud-Chemie), and the like.
  • Montmorillonite EZ- 1 , BFG
  • Aery solTM e.g ACRYSOL® RM 825, ACRYSOL® RM-W8, ACRYSOL® RM-W12, and the like
  • RHEOLATE® e.g., RHEOLATE® 450, Rheox Co.
  • OPTIFLO® e.g., OPTIFLO® TVS, OPT
  • Certain desirable thickeners include, but are not limited to various polymer or polymer emulsion thickeners such as silicone based thickeners, acrylic emulsion thickeners (e.g., CARBOPOL® EPl, CARBOPOL® 1324, etc.) and acrylic copolymers (e.g., CARBOPOL® EZ-1, CARBOPOL® EZ-3), polyether polyol- based associative thickener (e.g., RHEOLATE® 350), and the like.
  • the thickener when present comprises a xanthan gum (e.g. KELZAN® AR) and/or a polyether polyol- based associative thickener (e.g., RHEOLATE® 350).
  • the thickener can be present at up to about 4% or up to about 3%, or up to about 2%, or up to about 1%, by weight of the first component, but it is typically present at up to about 0.8%, or up to about 0.5%, or up to about 0.3%. In certain embodiments when the thickener is present it comprises at least about 0.1% of the first component and can range up to about 1% or up to about 0.5% of the first component of the multi-component formulation. In certain embodiments the thickener is present at about 0.3%) or at about 0.275%> of composition particular where the thickener is a xanthan gum such as KELZAN® AR.
  • protective coatings described herein comprise a coalescent.
  • Coalescents can be used in water-based film forming compositions to improve film formation (e.g., hardness) by temporarily lowering the glass transition temperature (Tg) of the polymers comprising the film former. Coalescents thus act as a temporary plasticizer "softening" the polymer which can then flow facilitating the fusing of polymer chains with each other to create a protective film. Typically, the coalescent decreases the open time, while giving better hardness to the film.
  • the coalescents utilized in the formulations described herein comprise coalescents suitable for use in latex paints.
  • Coalescents are well known to those of skill in the art and include, for example 2,2,4-trimethyl-l,3-pentanediol monoisobutyrate (TMB), 2-ethylhexyl benzoate (VELATE® 368), fatty acid esters (e.g., ester alcohol reactive coalescents such as
  • ester alcohols such as TEXANOL® (e.g., PubChem CID 6490; propanoic acid,2-methyl-,3 -hydroxy -2,2,4-trimethylpentyl ester), and the like.
  • TEXANOL® e.g., PubChem CID 6490; propanoic acid,2-methyl-,3 -hydroxy -2,2,4-trimethylpentyl ester
  • the coalescent when present ranges up to about 3%, by weight of the first component of the multi-component formulations. In certain embodiments, when present the coalescent comprises about 0.01%> to about 3%, or about 0.05%) to about 2%, or about 0.05% to about 0.1% of the formulations described herein. Defoamer.
  • the paint booth coating compositions includes one or more defoamers.
  • the defoamer(s) break bubbles, and prevent bubble patterns that would otherwise appear in the coating.
  • defoamers facilitate the loading of pressurized aerosol spray cans, pump sprayers or any other container in which the coating composition is to be stored and/or transported. Foam reduction allows more complete filling of the receptacle with the coating composition and reduces time spent waiting for foam to diminish during loading operations.
  • Desirable defoamers are compatible with aqueous systems and typically include a primary antifoam agent such as a hydrophobic silica, fatty amide, hydrocarbon wax, fatty acid, or fatty ester.
  • a primary antifoam agent such as a hydrophobic silica, fatty amide, hydrocarbon wax, fatty acid, or fatty ester.
  • Certain defoamers can include, but are not limited to, combined surfactant-defoamers.
  • Various defoamers include, but are not limited to
  • FOAMASTER® FOAMASTER®, BUBBLE BREAKER®, and 1 and 2 octanol.
  • the defoamer is a silicone-based defoamer
  • BYK-024 is a BYK-024 is a mixture of foam destroying polysiloxanes and hydrophobic solids in polyglycols [0104] In certain embodiments the defoamer, when present, ranges from about
  • the protective coating compositions described herein include one or more biocides or preservatives to improve shelf life and to help prevent degradation of the wet composition and/or the protective film formed therefrom.
  • biocides are well known to those of skill in the art.
  • Illustrative biocides include, for example, PROXEL GXL® (an aqueous solution of l,2-benzisothiazolin-3-one), and KATHON LX® a combination of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4- isothiazolin-3-one (total active ingredient ⁇ 14%), and the like.
  • biocide concentrations when present, are less than about 5%), preferably less than about 3%, more preferably less than about 1%, of the peelable component formulation. In certain embodiments the biocide comprises about 0.005%) up to about 0.1%, or about 0.005 % up to about 0.0.05% of the peelable component formulation. In certain embodiments the biocide comprises about 0.1% of the peelable component formulation.
  • the formulations described herein are intended to be illustrative. Using the teachings provided herein, numerous other suitable peelable formulations that resist discoloration (e.g., yellowing) will be available to one of skill in the art.
  • the Delta b value shown in Table 2 provides a measure of yellowing of the compositon. A higher Delta b value indicated more yellowing. Table 2 tracks the change in b value from the start to the date of the next read. [0111] As indicated a colorimeter was used to track the color change in the test samples. While the instrument tracks more than just the yellow-blue value for the purposes of tracking the performance of the coating compositions, we concentrated on the b value.
  • Color difference can be defined as the numerical comparison of a sample's color to the standard. It indicates the differences in absolute color coordinates and is referred to as Delta ( ⁇ ). These formulas calculate the difference between two colors to identify inconsistencies and help users control the color of their products more effectively.
  • L*a*b* color space was modeled after a color-opponent theory stating that two colors cannot be red and green at the same time or yellow and blue at the same time. As shown below, L* indicates lightness, a* is the red/green coordinate, and b* is the yellow/blue coordinate. Deltas for L* (AL*), a* (Aa*) and b* (Ab*) may be positive (+) or negative ( -). The total difference, Delta E ( ⁇ *), however, is always positive.
  • Table 2 Illustrative test results of showing yellowing of coating compositions formulated with sulfate process titanium dioxide compared to chloride process titanium dioxide.

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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)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne, dans divers modes de réalisation, une composition de revêtement protecteur pour protéger temporairement une cabine d'application de peinture par pulvérisation, la composition comprenant un liquide aqueux qui sèche après application sur une surface de ladite cabine de peinture pour y former pellicule blanche décollable, ledit revêtement liquide comprenant un agent filmogène liquide qui, une fois appliqué sur une surface et séché, forme une pellicule décollable, ledit agent filmogène liquide comprenant un polyvinylbutyral (PVB) ; et un pigment comprenant un dioxyde de titane rutile à traitement au sulfate ; et la composition de revêtement protecteur étant plus résistante au jaunissement que la même composition lorsqu'elle est formulée avec un dioxyde de titane à traitement au chlorure.
PCT/US2017/055402 2016-10-06 2017-10-05 Systèmes de revêtement protecteur pour cabines de peinture résistant à la décoloration Ceased WO2018067859A1 (fr)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020163684A1 (fr) * 2019-02-08 2020-08-13 Ppg Industries Ohio, Inc. Échantillons détachables
WO2021154962A1 (fr) * 2020-01-28 2021-08-05 Behr Process Corporation Peinture pelable à base d'eau pour revêtements d'architecture
US20220363936A1 (en) * 2020-07-27 2022-11-17 Hae Kwang Co., Ltd. Easily-peelable paint composition
US11555126B2 (en) 2020-02-28 2023-01-17 Gilberto Hinojosa Munoz Acidic biodegradable formulation and its use as a surface restorative agent
CZ309800B6 (cs) * 2022-09-08 2023-10-18 Libor Souček Odstranitelný ochranný povlak lakovací kabiny a způsob jeho vytvoření
WO2023241599A1 (fr) * 2022-06-15 2023-12-21 Dow Silicones Corporation Composition de revêtement pelable et son utilisation
EP4455227A1 (fr) * 2023-04-28 2024-10-30 Basf Se Système d'émulsion contenant une composition de latex anionique pour un revêtement amélioré
WO2024254773A1 (fr) * 2023-06-14 2024-12-19 Dow Silicones Corporation Composition de revêtement pelable et son utilisation

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US2486465A (en) * 1946-07-12 1949-11-01 New Jersey Zinc Co Production of titanium dioxide
US20060000390A1 (en) * 2004-07-02 2006-01-05 Bolt John D Titanium dioxide pigment and polymer compositions
EP1760116A1 (fr) * 2004-06-24 2007-03-07 Ishihara Sangyo Kaisha, Ltd. Pigments de dioxyde de titane, leur procede de production et compositions de resine contenant ces pigments
US20140158043A1 (en) * 2012-07-27 2014-06-12 Cal-West Specialty Coatings, Inc. Protective dust suppression coating systems for paint booths
US20160060422A1 (en) * 2013-04-15 2016-03-03 James Bohling Polymer particles adsorbed to sulfate-process titanium dioxide

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486465A (en) * 1946-07-12 1949-11-01 New Jersey Zinc Co Production of titanium dioxide
EP1760116A1 (fr) * 2004-06-24 2007-03-07 Ishihara Sangyo Kaisha, Ltd. Pigments de dioxyde de titane, leur procede de production et compositions de resine contenant ces pigments
US20060000390A1 (en) * 2004-07-02 2006-01-05 Bolt John D Titanium dioxide pigment and polymer compositions
US20140158043A1 (en) * 2012-07-27 2014-06-12 Cal-West Specialty Coatings, Inc. Protective dust suppression coating systems for paint booths
US20160060422A1 (en) * 2013-04-15 2016-03-03 James Bohling Polymer particles adsorbed to sulfate-process titanium dioxide

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020163684A1 (fr) * 2019-02-08 2020-08-13 Ppg Industries Ohio, Inc. Échantillons détachables
CN113396193A (zh) * 2019-02-08 2021-09-14 Ppg工业俄亥俄公司 可剥离样本
WO2021154962A1 (fr) * 2020-01-28 2021-08-05 Behr Process Corporation Peinture pelable à base d'eau pour revêtements d'architecture
US11739224B2 (en) 2020-01-28 2023-08-29 Behr Process Corporation Water based peelable paint for architecture coatings
US11555126B2 (en) 2020-02-28 2023-01-17 Gilberto Hinojosa Munoz Acidic biodegradable formulation and its use as a surface restorative agent
US20220363936A1 (en) * 2020-07-27 2022-11-17 Hae Kwang Co., Ltd. Easily-peelable paint composition
US20230080064A1 (en) * 2020-07-27 2023-03-16 Hae Kwang Co., Ltd. Easily-peelable paint composition
US11952504B2 (en) * 2020-07-27 2024-04-09 Hae Kwang Co., Ltd. Easily-peelable paint composition
WO2023241599A1 (fr) * 2022-06-15 2023-12-21 Dow Silicones Corporation Composition de revêtement pelable et son utilisation
CZ309800B6 (cs) * 2022-09-08 2023-10-18 Libor Souček Odstranitelný ochranný povlak lakovací kabiny a způsob jeho vytvoření
EP4455227A1 (fr) * 2023-04-28 2024-10-30 Basf Se Système d'émulsion contenant une composition de latex anionique pour un revêtement amélioré
WO2024254773A1 (fr) * 2023-06-14 2024-12-19 Dow Silicones Corporation Composition de revêtement pelable et son utilisation

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