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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/66—Additives characterised by particle size
  • C09D7/69—Particle size larger than 1000 nm
• • 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
  • C09D127/00—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 a halogen; Coating compositions based on derivatives of such polymers
  • C09D127/02—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
  • C09D127/12—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J36/00—Parts, details or accessories of cooking-vessels
  • A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
  • A47J36/025—Vessels with non-stick features, e.g. coatings
• • 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
  • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
  • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
• • 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
  • B05D7/56—Three layers or more
  • B05D7/57—Three layers or more the last layer being a clear coat
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/10—Metal compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/20—Oxides; Hydroxides
  • C08K3/22—Oxides; Hydroxides of metals
• • 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
  • C09D127/00—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 a halogen; Coating compositions based on derivatives of such polymers
  • C09D127/02—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
  • C09D127/12—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
  • C09D127/18—Homopolymers or copolymers of tetrafluoroethene
• • 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
  • C09D201/00—Coating compositions based on unspecified macromolecular compounds
  • C09D201/02—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
  • C09D201/04—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing halogen atoms
• • 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
• • 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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/61—Additives non-macromolecular inorganic
• • 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
  • B05D2202/00—Metallic substrate
• • 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
  • B05D2601/00—Inorganic fillers
  • B05D2601/20—Inorganic fillers used for non-pigmentation effect
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/20—Oxides; Hydroxides
  • C08K3/22—Oxides; Hydroxides of metals
  • C08K2003/2227—Oxides; Hydroxides of metals of aluminium

Definitions

• the present invention relates to the field of non-stick coatings intended to be applied to articles, and more particularly to household articles, such as cookware or household appliances.
• thermostable resin-based coatings including polytetrafluoroethylene (PTFE).
• PTFE polytetrafluoroethylene
• This durability is generally evaluated by the appearance of scratches on the metal and the wear of the coating which results in a loss of non-stickiness.
• PTFE polytetrafluoroethylene
• These attributes are generally covered by a transparent top coat of PTFE which guarantees an optimum level of non-sticking.
• this does not make it possible to durably protect the above-mentioned attributes from the mechanical stresses inherent in the use of the article (abrasion, scratch ).
• WO 2007/070601 describes coatings having a finishing layer comprising diamond particles. The use of such particles poses a problem in the cost of manufacturing the product comprising the coating.
• the Applicant has developed a non-stick coating comprising a finishing layer which overcomes the aforementioned drawbacks.
• this non-stick coating has optical properties compatible with the presence of visual attributes in the coating and makes it possible to increase the durability of the coating in the face of mechanical stresses, without degrading the non-stick coating.
• the present invention therefore relates to a non-stick coating comprising a transparent finishing layer, said finishing layer comprising at least one thermostable resin and fillers whose d50 is greater than the average thickness of said finishing layer.
• the present invention also relates to an article comprising a support provided with the non-stick coating according to the invention.
• finishing layer (sometimes referred to as “finish") is meant in the sense of the present invention the final coating layer, that is to say the coating layer intended to be in contact with the external environment.
• transparent layer is meant, within the meaning of the present invention, a layer which allows light to pass through it over the entire visible range, that is to say which must have a direct transmittance greater than 90% and a total Haze value less than 40%.
• the transparent topcoat of the coating according to the invention must have a direct transmittance greater than 90% and a totalized Haze value less than 40%.
• the finishing layer of the coating according to the invention is easily distinguishable from the layers on which it is deposited by sectional observations using a scanning electron microscope (SEM) or an optical microscope. By analyzing microscopic images, the thickness of the top coat can be measured. The thickness of the finishing layer is measured at 20 random points on the section of the coating. The average thickness of the top coat is obtained by averaging these 20 measurements.
• SEM scanning electron microscope
• the top layer has an average thickness of 2 to 40 ⁇ m, preferably from 10 to 30 ⁇ m.
• the d50 corresponds to the 50th percentile of the volume distribution of particle size, that is to say that 50% of the volume represents particles which have a size less than or equal to d50 and 50% of the particles which are larger than d50.
• the dv50 is defined similarly.
• the d50 is measured by laser particle size.
• the fillers have a d50 at least 1.4 times greater, preferably at least 1.5 times greater, than the average thickness of said top coat.
• the fillers have a d50 which is at most, 3 times greater, preferably 2 times greater, than the average thickness of said top coat.
• the load d50 is less than 1.4 times the average thickness of the topcoat, the optimal abrasion-resistant properties are no longer guaranteed. Conversely, if the d50 of the fillers is greater than 3 times the thickness of the top coat, this leads to a loss of non-stick coating.
• the fillers have a d50 greater than 2 pm.
• the fillers have a d50 greater than 20 ⁇ m, and preferably greater than 30 ⁇ m.
• the fillers have a d50 of less than 120 ⁇ m.
• the fillers have a d50 of less than 60 ⁇ m, and preferably less than 50 ⁇ m.
• the fillers are mineral fillers having a Mohs hardness greater than or equal to 7.
• fillers which can be used in the context of the present invention, mention may in particular be made of metal oxides, metal carbides, metal oxy-nitrides, metal nitrides, and mixtures thereof.
• the fillers are chosen from alumina, silicon carbide, zirconia, tungsten carbide, boron nitride, quartz, and their mixtures.
• the fillers used are metal oxides, preferably chosen from alumina, zirconia, quartz and their mixtures.
• the metal oxides are alumina.
• the finishing layer comprises from 0.5 to 20% of fillers, more preferably from 1 to 10%, percentages expressed in dry mass relative to the total dry mass of the finishing layer .
• the size, and therefore the d50, as well as the concentration of the charges in the finishing layer can be evaluated by carrying out an observation with a crossed optical microscope with a scanning electron microscope (SEM) provided with an EDS on the surface of the coating according to l 'invention.
• SEM scanning electron microscope
• a 1 cm 2 mapping provides a representative observation of the sample.
• the chemical composition of each charge is then determined by energy dispersive analyzes using a scanning electron microscope (SEM) equipped with an EDS.
• the particle size distribution is measured by computer and digital image processing. This makes it possible to determine the d50 as well as the average volume of the charges and therefore to determine the concentration.
• the volume concentration of the fillers can be calculated from the ratio of the volume of the fillers to the sum of the volume of the fillers and the top coat.
• the mass concentration is then calculated, taking account respectively of the density of the fillers and of the finishing layer.
• the top coat according to the invention comprises at least one thermostable resin.
• a thermostable resin is a resin resistant to at least 200 ° C.
• thermostable resin of the top layer is a fluorocarbon resin, preferably chosen from polytetrafluoroethylene (PTFE), copolymers of tetrafluoroethylene and perfluoromethylvinyl ether (such as MFA), copolymers of tetrafluoroethylene and perfluoropropylvinylether (such as PFA), copolymers of tetrafluoroethylene and hexafluoropropylene (such as FEP) and their mixtures.
• PTFE polytetrafluoroethylene
• MFA perfluoromethylvinyl ether
• PFA perfluoropropylvinylether
• FEP hexafluoropropylene
• the non-stick coating according to the invention may also comprise at least one layer of primer (sometimes referred to as “bonding primer” or “primer”).
• This primer layer is intended to be in contact with the surface of the support of the article on which the coating will be deposited.
• this primer layer allows the coating to hang on the support.
• the non-stick coating according to the invention may also further comprise at least one intermediate layer (sometimes referred to as "midcoat”) between the primer layer and the top coat.
• at least one intermediate layer sometimes referred to as "midcoat”
• the non-stick coating according to the invention may further comprise attributes, such as a decoration or an article-specific functionality such as an indicator of optimal cooking temperature. These attributes are applied between the primer and the topcoat if the coating does not include an intermediate layer or between the intermediate layer and the topcoat otherwise.
• the present invention also relates to an article comprising a support provided with the non-stick coating according to the invention.
• the article according to the invention is a household article, in particular a culinary article.
• domestic article is meant within the meaning of the present invention an object intended to ensure the domestic needs of everyday life, in particular an article intended to receive a heat treatment or intended to produce heat.
• it can be a culinary item or an appliance item.
• an object which will be heated by an external heating system in particular a culinary article such as frying pans, pots, sauté pans, woks, crepe makers, pots, pots, casseroles, braising pans, casseroles, barbecue grills, baking molds, fondue pots and which is able to transmit the heat energy provided by this external heating system to a material or food contact of said object.
• an external heating system in particular a culinary article such as frying pans, pots, sauté pans, woks, crepe makers, pots, pots, casseroles, braising pans, casseroles, barbecue grills, baking molds, fondue pots and which is able to transmit the heat energy provided by this external heating system to a material or food contact of said object.
• the present invention therefore also relates to a culinary article comprising a support provided with the non-stick coating according to the invention.
• the culinary article according to the invention comprises a support which has an internal face intended to receive food and an external face intended to be disposed towards a heat source, and a non-stick coating according to the invention arranged on at least one of the two faces of the support.
• a heating object having its own heating system in particular an appliance, such as irons, hair straighteners, steam generators or appliances appliances intended for cooking like a saucer.
• part of the article support is coated with the non-stick coating according to the invention, but it can be envisaged that the entire article support is coated.
• the support can be made of metallic material, glass, ceramic, terracotta or plastic.
• the support can be metallic and can be made of aluminum or aluminum alloy, anodized or not, optionally polished, brushed, sandblasted or microblasted, or steel possibly polished, brushed, sandblasted or microblasted, or stainless steel possibly polished , brushed, sandblasted or microblasted, or made of cast iron, aluminum or iron, or copper, possibly hammered or polished.
• the support can be metallic and can comprise an alternation of layers of metal and / or metallic alloy, or is a cap of foundry aluminum, aluminum or aluminum alloys lined with an external bottom. Stainless steel.
• the average thickness of the finishing layers was evaluated by sectional observations using a scanning electron microscope (SEM). The thickness of the finishing layers was measured at 20 random points on the cover sections. The average thickness of the topcoats was obtained by averaging these 20 measurements.
• SEM scanning electron microscope
• Example 1 Coating according to the invention comprising a top coat containing alumina fillers
• a finishing formulation was prepared from a dispersion of PTFE particles approximately 200 nm in diameter. 2.5% by mass of angular charges of alumina having a d50 of 44 ⁇ m in powder form was added to the dispersion. The dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This finishing formulation was sprayed on a shaped article (a frying pan) coated beforehand with two other layers all mainly composed of PTFE: a black primer, an intermediate layer as well as decorative attributes and functional (decor and optimal cooking temperature indicator).
• the quantity of finish formulation deposited was adjusted so as to obtain a measured average thickness of 20 ⁇ 1 ⁇ m of the finish layer after baking the article for 11 min at 430 ° C.
• Example 2 Coating According to the Invention Comprising a Top Coat Containing Alumina Fillers
• a first finishing formulation was prepared from a dispersion of PTFE particles approximately 200 nm in diameter. 2.5% by mass of charges Angular alumina having a d50 of 44 ⁇ m in powder form was added to the dispersion. The dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This first finishing formulation was sprayed onto a shaped article (a frying pan) coated beforehand with two other layers, all mainly composed of PTFE: a black primer, an intermediate layer as well as decorative attributes. and functional (decor and optimal cooking temperature indicator).
• a second clear, uncharged topcoat formulation was prepared from a dispersion of PTFE particles approximately 200 nm in diameter.
• the dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This second finishing formulation was then deposited on the first finishing formulation, by spraying.
• the quantity of formulation deposited was adjusted so as to obtain a total average thickness measured of 25 ⁇ 1 ⁇ m after baking of the article for 11 min at 430 ° C. and so that the first formulation represents 40% of the finishing layer and that the second formulation represents 60% of the top coat.
• Counterexample 1 Coating comprising an uncharged topcoat
• An uncharged topcoat was prepared from a dispersion of PTFE particles about 200 nm in diameter. The dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This finishing formulation was sprayed onto a shaped article (a frying pan) coated beforehand with two other layers, all mainly composed of PTFE: a black primer, an intermediate layer as well as decorative attributes and functional (decor and optimal cooking temperature indicator).
• the quantity of finish formulation deposited was adjusted so as to obtain a measured average thickness of 10 ⁇ 1 ⁇ m of the finishing layer after baking the article for 11 min at 430 ° C.
• a finishing formulation was prepared from a dispersion of PTFE particles approximately 200 nm in diameter. 1% by mass of colloidal alumina fillers having a d50 of 200 nm were added to the dispersion. The dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This finishing formulation was sprayed on a shaped article (a frying pan) coated beforehand with two other layers all mainly composed of PTFE: a black primer, an intermediate layer as well as decorative attributes and functional (decor and optimal cooking temperature indicator).
• the quantity of finish formulation deposited was adjusted so as to obtain a measured average thickness of 20 ⁇ 1 ⁇ m of the finish layer after baking the article for 11 min at 430 ° C.
• a finishing formulation was prepared from a dispersion of PTFE particles approximately 200 nm in diameter. 2.5% by mass of angular charges of alumina having a d50 of 1 ⁇ m in powder form was added to the dispersion. The dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This finishing formulation was sprayed onto a shaped article (a frying pan) coated beforehand with two other layers, all mainly composed of PTFE: a black primer, an intermediate layer as well as decorative attributes and functional (decor and optimal cooking temperature indicator).
• the quantity of finish formulation deposited was adjusted so as to obtain a measured average thickness of 20 ⁇ 1 ⁇ m of the finishing layer after baking the article for 11 min at 430 ° C.
• Counter-Example 3a Coating comprising a top coat containing alumina fillers whose d50 is 1.3 times greater than the thickness of the top layer
• a finishing formulation was prepared from a dispersion of PTFE particles approximately 200 nm in diameter. 2.5% by mass of angular charges of alumina having a d50 of 26 ⁇ m in powder form was added to the dispersion. The dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This finishing formulation was sprayed on a shaped article (a frying pan) coated beforehand with two other layers all mainly composed of PTFE: a black primer, an intermediate layer as well as decorative attributes and functional (decor and optimal cooking temperature indicator).
• the quantity of finish formulation deposited was adjusted so as to obtain a measured average thickness of 20 ⁇ 1 ⁇ m of the finish layer after baking the article for 11 min at 430 ° C.
• the alumina load d50 is therefore 1.3 times greater than the thickness of the top coat.
• a finishing formulation was prepared from a dispersion of PTFE particles approximately 200 nm in diameter. 2.5% by mass of angular charges of alumina having a d50 of 44 ⁇ m in powder form were added to the dispersion. The dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This finishing formulation was sprayed on a shaped article (a frying pan) coated beforehand with two other layers all mainly composed of PTFE: a black primer, an intermediate layer as well as decorative attributes and functional (decor and optimal cooking temperature indicator).
• the quantity of finish formulation deposited was adjusted so as to obtain a measured average thickness of 40 ⁇ 1 ⁇ m of the finish layer after baking the article for 11 min at 430 ° C.
• the alumina load d50 is therefore 1.1 times greater than the thickness of the top coat.
• a finishing formulation was prepared from a dispersion of PTFE particles approximately 200 nm in diameter. 2.5% by mass of angular charges of alumina having a d50 of 64 ⁇ m in powder form was added to the dispersion. The dry extract of the dispersion was fixed at 50% by mass. In order to keep this parameter fixed, the amount of water has been adjusted.
• This finishing formulation was sprayed onto a shaped article (a frying pan) coated beforehand with two other layers, all mainly composed of PTFE: a black primer, an intermediate layer as well as decorative attributes and functional (decor and optimal cooking temperature indicator).
• the quantity of finish formulation deposited was adjusted so as to obtain a measured average thickness of 20 ⁇ 1 ⁇ m of the finish layer after baking the article for 11 min at 430 ° C.
• the d50 of the alumina filler is therefore 3.2 times greater than the thickness of the finishing layer.
• This test evaluates the resistance of the coating to the action of an abrasive pad applied to its surface and the drop in non-sticking of this coating by a milk carbonization test after it has been subjected to the abrasion cycle. . It is based on a normative test: NF D 21 -51 1 with specific features.
• the device used is an abrasimeter with a horizontal movement.
• a fixed arm supports a rectangular pad of dimensions 70 ⁇ 5 mm x 30 ⁇ 5 mm, on which is placed an abrasive pad of the same dimension, and includes a tare allowing the application of a load of 21 N (mass of the arm of lever included).
• the abrasive moves at the speed of 33 back and forth per minute.
• the abraded surface is 70 mm x 130 mm, i.e. a stroke of 100 mm.
• 1000 abrasion cycles i.e. 1000 round trips of the abrasive
• the evolution of the anti-adhesion is evaluated after carbonization of a film of milk.
• the test is stopped at the appearance of a scratch or a loss of non-stick (milk hooked irreversibly even after cleaning).
• v is proportional to K, to the modulus of the normal force » M ' ⁇ (21 N) and to the distance traveled d (ie 200 m).
• finishing formulations of the above examples and counterexamples were each applied directly to an enameled and smooth plate.
• the quantity of finish formulation deposited was adjusted so as to obtain the same average thicknesses of finish layer as those of the examples and counterexamples, after baking the plate for 11 min at 430 ° C.
• the films thus obtained were removed from the plates and analyzed.
• a coating must contain a top coat with a higher direct transmittance 90% and whose total Haze value is less than 40%.

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Publications (1)

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• 2019
  • 2019-01-07 FR FR1900124A patent/FR3091532B1/fr active Active
  • 2019-12-20 CN CN201980088200.8A patent/CN113286857A/zh active Pending
  • 2019-12-20 US US17/421,076 patent/US20220112383A1/en active Pending
  • 2019-12-20 BR BR112021013017-9A patent/BR112021013017A2/pt unknown
  • 2019-12-20 KR KR1020217024672A patent/KR20210110870A/ko active Search and Examination
  • 2019-12-20 WO PCT/EP2019/086568 patent/WO2020144051A1/fr active Application Filing
  • 2019-12-20 JP JP2021539861A patent/JP2022516959A/ja active Pending
  • 2019-12-20 EP EP19824333.9A patent/EP3908639A1/fr active Pending
  • 2019-12-20 CA CA3124997A patent/CA3124997A1/fr active Pending
• 2021
  • 2021-07-12 CO CONC2021/0009070A patent/CO2021009070A2/es unknown

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