CA2196255A1 - Non-stick coating for aluminium cooking vessels - Google Patents
Non-stick coating for aluminium cooking vesselsInfo
- Publication number
- CA2196255A1 CA2196255A1 CA002196255A CA2196255A CA2196255A1 CA 2196255 A1 CA2196255 A1 CA 2196255A1 CA 002196255 A CA002196255 A CA 002196255A CA 2196255 A CA2196255 A CA 2196255A CA 2196255 A1 CA2196255 A1 CA 2196255A1
- Authority
- CA
- Canada
- Prior art keywords
- coating
- undercoat layer
- layer
- aluminum
- primer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Cookers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
A non-stick coating for aluminum cooking vessels comprises an undercoat layer applied directly to the aluminum, a primer layer applied to the undercoat layer and a top finish layer applied to the primer layer. The primer layer is obtained from an aqueous dispersion of polytetrafluorethylene to which are added polyamide-imide resin and tetrafluorethylene and poly (propyl vinyl ether) copolymer. The top finish layer is obtained from an aqueous dispersion of PTFE and the undercoat layer is obtained from a polyamide-imide resin in solution in an organic solvent.
Description
-NON-STICK COATING FOR ALUMINUM COOKING VESSELS
BACKGROUND OF THE INVENTION
Field of the invention The present invention concerns a non-stick coating - 5 for aluminum cooking vessels such as saucepans and frying pans.
Description of the prior art Most non-stick coatings are based on polytetrafluorethylene (PTFE).
To make such coatings adhere to the surface of the aluminum the latter is usually etched with acid to create microcavities encouraging the a&esion of the PTFE
coating or a surface roughness of approximately 12 microns is produced by mechanical treatment to enable the adhesion of a primer layer.
A coating adhering to an aluminum substrate that has not received any chemical or mechanical treatment to roughen its surface is known from PCT application 3.
The coating described in this PCT application comprises an undercoat layer, a primer layer and a top finish layer.
The undercoat layer is obtained from an aqueous phase containing a surfactant, silica, a polyamide-imide resin (PAI), polyphenylene sulfide or polyether sulfone.
The primer layer is obtained from an aqueous dispersion of polytetrafluorethylene (PTFE) to which are added polyamide-imide resin (PAI) and tetrafluorethylene and poly (propyl vinyl ether) (PFA) copolymer.
The top finish layer is obtained from an aqueous dispersion of PTFE.
The above layers are all applied to the substrate by spraying in the aqueous phase.
After drying, these layers are baked in an oven to sinter the coating.
The undercoat layer has the drawback of requiring transformation of the organic phase of the PAI resin into the aqueous phase and the presence of surfactants.
The aim of the present invention is to create a non-stick coating that shows excellent adhesion to aluminum substrates whether or not they have been mechanically or chemically treated to roughen their surface.
SUMMARY OF THE INVENTION
Accordingly, the invention concerns a non-stick coating for aluminum cooking vessels comprising an undercoat layer applied directly to the aluminum, a primer layer applied to said undercoat layer and a top finish layer applied to said primer layer, said primer layer being obtained from an aqueous dispersion of polytetrafluorethylene to which are added polyamide-imide resin and tetrafluorethylene and poly (propyl vinyl ether) copolymer, said top finish layer being obtained from an aqueous dispersion of PTFE and said undercoat layer being obtained from a polyamide-imide resin in solution in an organic solvent.
Tests have shown, surprisingly, that an undercoat layer of this kind containing an organic solvent adheres to the substrate just as well as the prior art aqueous phase undercoat layer.
This undercoat layer does not require any complex transformation from an organic phase to the aqueous phase in the presence of surfactants and amides.
The undercoat layer may be obtained from a mixture of polyamine-imide resin and polyphenylene sulfide.
The organic solvent used in the undercoat layer is preferably selected from the following compounds:
N-methylpyrrolidone, dimethylformamide or an NMP/xylene or DMF/xylene mixture.
The undercoat layer may contain inert charges such as mineral pigments, metal flakes, alumina, quartz.
The undercoat layer of the coating of the invention shows excellent adhesion to aluminum even if the surface of the latter has not been subjected to any form of chemical or physical treatment other than degreasing.
In one version of the invention the primer layer and the top finish layer are applied by the silkscreening or roller coating process.
The method of applying a non-stick coating by the silkscreening process and the attendant advantages are described in French patent 2 689 037 in the name of SEB S.A.
In this case, the primer layer and the top finish layer also contain a thickening agent such as an acrylic resin.
There follows one example of the composition (in parts by weight) of the undercoat layer of the coating of the invention.
. dry PAI (polyamide-imide) resin 30 . N-methylpyrrolidone 230 . xylene 0 - 10 . pigment (mineral or carbon black) 0 - 25 . aluminum flakes 0 - 40 . PPS (polyphenylene sulfide) 0 - 80 The aluminum flakes encourage adhesion of the primer layer to the above undercoat layer. Their presence at the surface of the undercoat layer confers on the latter a roughness equivalent to that of mechanical treatment and provides an armature for the final coating in the manner of a mechanical treatment.
To this end, their dimensions must not exceed 25 microns.
The above undercoat layer may be sprayed onto an aluminum disc that has merely been degreased or applied by the silkscreening process or any other conventional means.
The undercoat layer is then dried to eliminate the organic solvent.
The primer layer and the top finish layer are then applied in succession by the silkscreening process as described in French patent 2 689 037 or any other conventional means.
The primer layer is made up of an aqueous dispersion of PTFE to which has been added a PAI resin, a PFA dispersion and, in the case of application by the silkscreening or roller coating process, an acrylic resln.
The top finish layer applied after the primer layer has dried is made up of an aqueous dispersion of PTFE, mica flakes, a pigment such as carbon black and, in the case of application by the silkscreening or roller coating process, a thickening agent such as an acrylic resln .
After drying the top layer, the three layers are baked simultaneously in an oven for 1' - 10' at approximately 400C - 420C.
Tests show that the coating obtained in this way adhere perfectly to the support.
When an aluminum disc is coated with these three layers by the silkscreening or roller coating process, for example, it can be formed after sintering into a cooking vessel such as a saucepan, frying pan, cake tin, etc without degrading the adhesion of the coating to the support.
BACKGROUND OF THE INVENTION
Field of the invention The present invention concerns a non-stick coating - 5 for aluminum cooking vessels such as saucepans and frying pans.
Description of the prior art Most non-stick coatings are based on polytetrafluorethylene (PTFE).
To make such coatings adhere to the surface of the aluminum the latter is usually etched with acid to create microcavities encouraging the a&esion of the PTFE
coating or a surface roughness of approximately 12 microns is produced by mechanical treatment to enable the adhesion of a primer layer.
A coating adhering to an aluminum substrate that has not received any chemical or mechanical treatment to roughen its surface is known from PCT application 3.
The coating described in this PCT application comprises an undercoat layer, a primer layer and a top finish layer.
The undercoat layer is obtained from an aqueous phase containing a surfactant, silica, a polyamide-imide resin (PAI), polyphenylene sulfide or polyether sulfone.
The primer layer is obtained from an aqueous dispersion of polytetrafluorethylene (PTFE) to which are added polyamide-imide resin (PAI) and tetrafluorethylene and poly (propyl vinyl ether) (PFA) copolymer.
The top finish layer is obtained from an aqueous dispersion of PTFE.
The above layers are all applied to the substrate by spraying in the aqueous phase.
After drying, these layers are baked in an oven to sinter the coating.
The undercoat layer has the drawback of requiring transformation of the organic phase of the PAI resin into the aqueous phase and the presence of surfactants.
The aim of the present invention is to create a non-stick coating that shows excellent adhesion to aluminum substrates whether or not they have been mechanically or chemically treated to roughen their surface.
SUMMARY OF THE INVENTION
Accordingly, the invention concerns a non-stick coating for aluminum cooking vessels comprising an undercoat layer applied directly to the aluminum, a primer layer applied to said undercoat layer and a top finish layer applied to said primer layer, said primer layer being obtained from an aqueous dispersion of polytetrafluorethylene to which are added polyamide-imide resin and tetrafluorethylene and poly (propyl vinyl ether) copolymer, said top finish layer being obtained from an aqueous dispersion of PTFE and said undercoat layer being obtained from a polyamide-imide resin in solution in an organic solvent.
Tests have shown, surprisingly, that an undercoat layer of this kind containing an organic solvent adheres to the substrate just as well as the prior art aqueous phase undercoat layer.
This undercoat layer does not require any complex transformation from an organic phase to the aqueous phase in the presence of surfactants and amides.
The undercoat layer may be obtained from a mixture of polyamine-imide resin and polyphenylene sulfide.
The organic solvent used in the undercoat layer is preferably selected from the following compounds:
N-methylpyrrolidone, dimethylformamide or an NMP/xylene or DMF/xylene mixture.
The undercoat layer may contain inert charges such as mineral pigments, metal flakes, alumina, quartz.
The undercoat layer of the coating of the invention shows excellent adhesion to aluminum even if the surface of the latter has not been subjected to any form of chemical or physical treatment other than degreasing.
In one version of the invention the primer layer and the top finish layer are applied by the silkscreening or roller coating process.
The method of applying a non-stick coating by the silkscreening process and the attendant advantages are described in French patent 2 689 037 in the name of SEB S.A.
In this case, the primer layer and the top finish layer also contain a thickening agent such as an acrylic resin.
There follows one example of the composition (in parts by weight) of the undercoat layer of the coating of the invention.
. dry PAI (polyamide-imide) resin 30 . N-methylpyrrolidone 230 . xylene 0 - 10 . pigment (mineral or carbon black) 0 - 25 . aluminum flakes 0 - 40 . PPS (polyphenylene sulfide) 0 - 80 The aluminum flakes encourage adhesion of the primer layer to the above undercoat layer. Their presence at the surface of the undercoat layer confers on the latter a roughness equivalent to that of mechanical treatment and provides an armature for the final coating in the manner of a mechanical treatment.
To this end, their dimensions must not exceed 25 microns.
The above undercoat layer may be sprayed onto an aluminum disc that has merely been degreased or applied by the silkscreening process or any other conventional means.
The undercoat layer is then dried to eliminate the organic solvent.
The primer layer and the top finish layer are then applied in succession by the silkscreening process as described in French patent 2 689 037 or any other conventional means.
The primer layer is made up of an aqueous dispersion of PTFE to which has been added a PAI resin, a PFA dispersion and, in the case of application by the silkscreening or roller coating process, an acrylic resln.
The top finish layer applied after the primer layer has dried is made up of an aqueous dispersion of PTFE, mica flakes, a pigment such as carbon black and, in the case of application by the silkscreening or roller coating process, a thickening agent such as an acrylic resln .
After drying the top layer, the three layers are baked simultaneously in an oven for 1' - 10' at approximately 400C - 420C.
Tests show that the coating obtained in this way adhere perfectly to the support.
When an aluminum disc is coated with these three layers by the silkscreening or roller coating process, for example, it can be formed after sintering into a cooking vessel such as a saucepan, frying pan, cake tin, etc without degrading the adhesion of the coating to the support.
Claims (9)
1. A non-stick coating for aluminum cooking vessels comprising an undercoat layer applied directly to the aluminum, a primer layer applied to said undercoat layer and a top finish layer applied to said primer layer, said primer layer being obtained from an aqueous dispersion of polytetrafluorethylene to which are added polyamide-imide resin and tetrafluorethylene and poly (propyl vinyl ether) copolymer, said top finish layer being obtained from an aqueous dispersion of PTFE and said undercoat layer being obtained from a polyamide-imide resin in solution in an organic solvent.
2. The coating claimed in claim 1 wherein said undercoat layer is obtained from a mixture of polyamide-imide resin and polyphenylene sulfide.
3. The coating claimed in claim 1 wherein said organic solvent is selected from: N-methylpyrrolidone, dimethylformamide or an NMP/xylene or DMF/xylene mixture.
4. The coating claimed in claim 1 wherein said undercoat layer further contains inert charges such as mineral pigments, metal flakes, alumina and quartz.
5. The coating claimed in claim 1 wherein said undercoat layer has the following composition, in parts by weight:
. dry PAI (polyamide-imide) resin 30 . N-methylpyrrolidone 230 . xylene 0 - 10 . pigment (mineral or carbon black) 0 - 25 . aluminum flakes 0 - 40 . PPS (polyphenylene sulfide) 0 - 80
. dry PAI (polyamide-imide) resin 30 . N-methylpyrrolidone 230 . xylene 0 - 10 . pigment (mineral or carbon black) 0 - 25 . aluminum flakes 0 - 40 . PPS (polyphenylene sulfide) 0 - 80
6. The coating claimed in claim 1 wherein said undercoat layer is applied to aluminum which has not been subjected to any chemical or physical treatment other than degreasing.
7. The coating claimed in claim 1 wherein said primer and top finish layers are applied by the silkscreening or roller coating process.
8. The coating claimed in claim 7 wherein said primer and top finish layers further contain a thickening agent.
9. The coating claimed in claim 4 wherein said undercoat layer contains aluminum flakes having dimensions less than or equal to 25 microns.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9600996A FR2744129B1 (en) | 1996-01-29 | 1996-01-29 | ANTI-ADHESIVE COATING FOR ALUMINUM KITCHEN UTENSILS |
| FR9600996 | 1996-01-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2196255A1 true CA2196255A1 (en) | 1997-07-30 |
Family
ID=9488557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002196255A Abandoned CA2196255A1 (en) | 1996-01-29 | 1997-01-29 | Non-stick coating for aluminium cooking vessels |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0786290B1 (en) |
| JP (1) | JPH09313357A (en) |
| CN (1) | CN1097077C (en) |
| BR (1) | BR9700794A (en) |
| CA (1) | CA2196255A1 (en) |
| DE (2) | DE786290T1 (en) |
| ES (1) | ES2109911T3 (en) |
| FR (1) | FR2744129B1 (en) |
| RU (1) | RU2181023C2 (en) |
| TR (1) | TR199700055A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7695807B2 (en) | 2006-04-04 | 2010-04-13 | E.I. Du Pont De Nemours And Company | Non-stick finish |
| US7772311B2 (en) | 2006-04-04 | 2010-08-10 | E.I. Du Pont De Nemours And Company | Non-stick finish composition |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69718334T2 (en) * | 1996-10-15 | 2003-10-16 | Du Pont | NON-HOLDING FINISH COVER FOR MOLDING OBJECTS |
| FR2791065A1 (en) | 1999-03-16 | 2000-09-22 | Seb Sa | NON-STICK COATING HAVING IMPROVED SCRATCH RESISTANCE |
| FR2791066A1 (en) | 1999-03-16 | 2000-09-22 | Seb Sa | NON-STICK COATING HAVING IMPROVED SCRATCH RESISTANCE |
| US6228915B1 (en) * | 1999-04-15 | 2001-05-08 | General Electric Company | Compositions and methods for reduced food adhesion |
| FR2827869B1 (en) * | 2001-07-26 | 2007-04-13 | Seb Sa | ANTI-ADHESIVE COATING HAVING ENHANCED SCRATCH AND ABRASION RESISTANCE |
| JP4442563B2 (en) | 2002-11-22 | 2010-03-31 | ダイキン工業株式会社 | Coating composition, fluorine-containing laminate and resin composition |
| FR2869817B1 (en) * | 2004-05-04 | 2008-05-30 | Seb Sa | METHOD FOR MANUFACTURING AN ANTI-ADHESIVE COATING AND A CULINARY ARTICLE SO COATED |
| US7833637B2 (en) | 2005-03-15 | 2010-11-16 | Seb S.A. | Easy-to-clean cooking surface and electrical household appliance comprising such a surface |
| CN1994095B (en) * | 2006-12-04 | 2012-06-20 | 张友军 | Crispy fried stuffed bun, preparation method and pan dedicated therefor |
| ATE517566T1 (en) | 2008-07-01 | 2011-08-15 | Icb N V | COOKING UTENSILS WITH REMOVABLE AND/OR REPLACEABLE BASE |
| US8883299B2 (en) | 2009-02-09 | 2014-11-11 | Whitford B.V. | Composition for use as non-stick coating |
| KR100980240B1 (en) * | 2009-09-24 | 2010-09-06 | 주식회사 이룸쿡 | Method for manufacturing cooking apparatus with image layer |
| PT2513221T (en) * | 2009-12-18 | 2017-01-18 | Whitford Corp | Blended fluoropolymer compositions having multiple melt processible fluoropolymers |
| FR3015507B1 (en) * | 2013-12-20 | 2016-12-30 | Seb Sa | AQUEOUS COMPOSITIONS FOR PRIMERS OF ANTI-ADHESIVE COATINGS AND PROCESS FOR THEIR PREPARATION |
| CN104257256B (en) * | 2014-10-20 | 2017-11-14 | 武汉苏泊尔炊具有限公司 | Non-stick pan and its manufacture method |
| CN109924886A (en) * | 2017-12-15 | 2019-06-25 | 佛山市顺德区美的电热电器制造有限公司 | A kind of heating utensil and preparation method thereof |
| CN112006546A (en) * | 2020-07-08 | 2020-12-01 | 河北三厦厨具科技有限公司 | Preparation method of non-stick coating, pot and manufacturing method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4177320A (en) * | 1976-12-10 | 1979-12-04 | Daikin Kogyo Co., Ltd. | Article coated with fluorocarbon polymer |
| DE69005828T2 (en) * | 1989-08-21 | 1994-06-16 | Du Pont | ANTI-ADHESIVE COATING SYSTEM WITH A THIN BASIC COATING OF POLYAMIDE IMID, POLYARYLENE SULFIDE OR POLYETHER SULPHONE. |
| JPH07108385B2 (en) * | 1990-12-12 | 1995-11-22 | イー・アイ・デユポン・ドウ・ヌムール・アンド・カンパニー | Non-stick coating system with PTFE and PFA or FEP for concentration gradient |
| FR2689037B1 (en) | 1992-03-27 | 1995-06-30 | Seb Sa | PROCESS FOR APPLYING A FLUOROCARBON RESIN COATING ON A FLAT METAL SUPPORT. |
| IT1273335B (en) * | 1994-02-24 | 1997-07-08 | Lambda Srl | WATER-BASED PAINTS WITH LOW CONTENT OF VOLATILE SUBSTANCES FOR THE NON-STICK COATING OF ALUMINUM POTS |
-
1996
- 1996-01-29 FR FR9600996A patent/FR2744129B1/en not_active Expired - Fee Related
-
1997
- 1997-01-24 EP EP97400166A patent/EP0786290B1/en not_active Expired - Lifetime
- 1997-01-24 DE DE0786290T patent/DE786290T1/en active Pending
- 1997-01-24 DE DE69705752T patent/DE69705752T2/en not_active Expired - Fee Related
- 1997-01-24 ES ES97400166T patent/ES2109911T3/en not_active Expired - Lifetime
- 1997-01-24 RU RU97101282/13A patent/RU2181023C2/en not_active IP Right Cessation
- 1997-01-28 JP JP9014361A patent/JPH09313357A/en not_active Withdrawn
- 1997-01-28 TR TR97/00055A patent/TR199700055A1/en unknown
- 1997-01-28 BR BR9700794A patent/BR9700794A/en not_active Application Discontinuation
- 1997-01-29 CN CN97103150A patent/CN1097077C/en not_active Expired - Fee Related
- 1997-01-29 CA CA002196255A patent/CA2196255A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7695807B2 (en) | 2006-04-04 | 2010-04-13 | E.I. Du Pont De Nemours And Company | Non-stick finish |
| US7772311B2 (en) | 2006-04-04 | 2010-08-10 | E.I. Du Pont De Nemours And Company | Non-stick finish composition |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2744129B1 (en) | 1998-04-10 |
| BR9700794A (en) | 1998-10-06 |
| CN1097077C (en) | 2002-12-25 |
| DE69705752D1 (en) | 2001-08-30 |
| DE69705752T2 (en) | 2002-05-23 |
| ES2109911T3 (en) | 2001-09-01 |
| ES2109911T1 (en) | 1998-02-01 |
| JPH09313357A (en) | 1997-12-09 |
| DE786290T1 (en) | 1998-06-25 |
| EP0786290A1 (en) | 1997-07-30 |
| TR199700055A1 (en) | 1997-08-21 |
| RU2181023C2 (en) | 2002-04-10 |
| EP0786290B1 (en) | 2001-07-25 |
| CN1164553A (en) | 1997-11-12 |
| FR2744129A1 (en) | 1997-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |