DE1546934B2 - Process for the formation of a polytetrafluoroethylene protective layer - Google Patents
Process for the formation of a polytetrafluoroethylene protective layerInfo
- Publication number
- DE1546934B2 DE1546934B2 DE1965F0045888 DEF0045888A DE1546934B2 DE 1546934 B2 DE1546934 B2 DE 1546934B2 DE 1965F0045888 DE1965F0045888 DE 1965F0045888 DE F0045888 A DEF0045888 A DE F0045888A DE 1546934 B2 DE1546934 B2 DE 1546934B2
- Authority
- DE
- Germany
- Prior art keywords
- protective layer
- polytetrafluoroethylene
- layer
- formation
- anodized
- 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.)
- Withdrawn
Links
- -1 polytetrafluoroethylene Polymers 0.000 title claims description 13
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims description 12
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 9
- 239000011241 protective layer Substances 0.000 title claims description 9
- 230000015572 biosynthetic process Effects 0.000 title 1
- 238000005530 etching Methods 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- 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
- B05D5/086—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 having an anchoring layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
-
- 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
- B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
- B05D2401/20—Aqueous dispersion or solution
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Description
2020th
Die Erfindung betrifft ein Verfahren zur Bildung einer Polytetrafluoräthylen-Schutzschicht auf gereinigten und anodisch oxydierten Aluminiumgegenständen. The invention relates to a method for forming a polytetrafluoroethylene protective layer on cleaned and anodized aluminum objects.
Außer dieser bekannten Vorbehandlung wird >~> wahlweise die Vorbehandlung durch Reinigung und anschließendes Ätzen empfohlen (GB-PS 735 854). Offenbar ist für beide Fälle eine Verbesserung der Haftung erforderlich, die durch Einpressen der zuletzt aufgebrachten Schutzschicht und unter Vakuum 3< > durchgeführt wird. Solange die Schutzschicht mechanisch nicht beansprucht wird, kann die so erzielte Haftung ausreichend sein. Die Abrieb- bzw. Kratzfestigkeit einer solchen Schicht ist aber sehr gering. Beim Hantieren mit metallenen Spateln, Spachteln, Gabeln r> usw. wird eine solche Schicht zerstört. Deshalb wird empfohlen, sie nur mit Kratzgegenständen oder Schabgegenständen aus Holz zu reinigen. Auch scheuernde Mittel wie etwa Stahlwolle, können zum Reinigen nicht verwendet werden, weil auch sie die Schicht bald zerstören. Die Haltbarkeit der Beschichtung im täglichen Gebrauch ist begrenzt, die damit versehenen Gegenstände sind im Gebrauch erheblichen Beschränkungen unterworfen.In addition to this known pretreatment,> ~> optionally pretreatment by cleaning and subsequent etching recommended (GB-PS 735 854). Apparently there is an improvement in both cases Adhesion required by pressing in the protective layer applied last and under vacuum 3 < > is carried out. As long as the protective layer is not mechanically stressed, the adhesion achieved in this way can be enough. The abrasion or scratch resistance of such a layer is very low. At the Handling of metal spatulas, spatulas, forks etc. will destroy such a layer. Therefore will recommended to clean them only with scraping or scraping objects made of wood. Even Abrasive agents such as steel wool cannot be used for cleaning because they too do Destroy layer soon. The durability of the coating in daily use is therefore limited provided objects are subject to considerable restrictions in use.
Der Erfindung liegt die Aufgabe zugrunde, sowohl 4-> die flächige Abriebfestigkeit als auch die Kratzfestigkeit und damit die Lebensdauer der Polytetrafluoräthylenschicht zu erhöhen. Dies wird erfindungsgemäß dadurch erreicht, daß nach der Reinigung eine starke Ätzzwischenbehandlung in Salzsäure und die anodische Oxydation nach dem Gleichstrom-Schwefelsäure-Verfahren vorgenommen wird. Die Ätzbehandlung erzeugt in der Leichtmetalloberfläche hinterschnittene Höhlungen, deren Wandungen durch die Anodisierung mit einer Eloxalschicht von hoher Härte überzogen werden. Die Eloxalschicht ist ihrerseits porös und saugfähig und nimmt die Schutzschicht aus Polytetrafluoräthylen gierig auf. Mit der anodischen Oxydation erhält die an sich weiche Oberfläche der hinterschnittenen Höhlungen die erwünschte Härte, die der aufgetragenen Schutzschicht ihre Abrieb- und Kratzfestigkeit gibt. Ein zusätzlicher Vorteil ist darin zu sehen, daß in der unverdichteten Eloxaloberfläche vorhandene Poren ihrerseits, ebenso wie die durch Ätzen erzeugten Vertiefungen, das Material der Schutzschicht aufnehmen und festhalten.The invention is based on the task of both 4-> the surface abrasion resistance as well as the scratch resistance and thus the service life of the polytetrafluoroethylene layer to increase. This is achieved according to the invention in that after cleaning a strong intermediate etching treatment in hydrochloric acid and anodic oxidation using the direct current sulfuric acid process is made. The etching treatment creates undercuts in the light metal surface Cavities, the walls of which are anodized with an anodized layer of high Hardness to be coated. The anodized layer itself is porous and absorbent and takes up the protective layer made of polytetrafluoroethylene greedily. With the anodic oxidation the surface is soft in itself the undercut cavities the desired hardness, which gives the applied protective layer its abrasion and scratch resistance. An additional advantage can be seen in the fact that the uncompacted anodized surface existing pores in turn, as well as the depressions produced by etching, the material the protective layer and hold.
Aus der Zeichnung geht hervor, was mit dem Verfahren nach der Erfindung erreicht wird.The drawing shows what is achieved with the method according to the invention.
Die Salzsäureätzung erzeugt tief hinterschnittene Höhlungen 1 in der Leichtmetalloberfläche 2. Die Wandungen dieser Höhlungen überzieht die Anodisierung mit einer Eloxalschicht 3 von hoher Härte. Da die Eloxalschicht 3 nicht verdichtet wird, bleibt sie saugfähig und nimmt in ihren Poren 4 Lack oder eine Dispersion 5 von Polytetrafluoräthylen gierig auf.The hydrochloric acid etching produces deeply undercut cavities 1 in the light metal surface 2. The The anodization covers the walls of these cavities with an anodized layer 3 of high hardness. There the anodized layer 3 is not compressed, it remains absorbent and takes in its pores 4 lacquer or a Dispersion 5 of polytetrafluoroethylene greedily.
Das Polytetrafluoräthylen bildet auf der Oberfläche des Gegenstandes einen geschlossenen Film. Auch bei dessen Beschädigung bleibt der Antiklebeeffekt des Polytetrafluoräthylens vollkommen ausreichend erhalten, dank der in den Ätzgruben und Poren verbleibenden Füllung. Die Ätzgruben können, wegen der Härte der Eloxalschicht, auch durch Kratzen mit scharfkantigen Gegenständen nicht zerstört werden, wie dies der Fall wäre, wenn die Schutzschicht unmittelbar auf das geätzte Leichtmetall aufgebracht worden wäre.The polytetrafluoroethylene forms a closed film on the surface of the object. Also at if it is damaged, the anti-sticking effect of the polytetrafluoroethylene is fully preserved, thanks to the filling remaining in the etch pits and pores. The etch pits can, because of the The hardness of the anodized layer cannot be destroyed, even by scratching with sharp-edged objects, as would be the case if the protective layer had been applied directly to the etched light metal were.
Im folgenden wird für das Verfahren ein Ausführungsbeispiel geschildert:An exemplary embodiment of the method is described below:
1. Beizen in NaOH, 20%, 1 Min.,Temp. 60-80° C.1. Pickling in NaOH, 20%, 1 min., Temp. 60-80 ° C.
2. Spülen in H2O.2. Rinse in H 2 O.
3. Ätzen in HCI, 10%, 40° C, 0,5 Min.3. Etching in HCI, 10%, 40 ° C, 0.5 min.
4. Spülen in H2O.4. Flush in H 2 O.
5. Eloxieren nach dem GS-Verfahren ohne Nachverdichtung, Dauer 10-20 Min.5. Anodizing according to the GS method without recompaction, duration 10-20 minutes.
6. Beschichten mit einer Dispersion on reinem Polytetrafluoräthylen (60%) in Wasser (40%) unter Hinzufügen eines Netzmittels, bzw. Auftragen eines Polytetrafluoräthylen-Lackes.6. Coating with a dispersion of pure polytetrafluoroethylene (60%) in water (40%) with the addition of a wetting agent or application of a polytetrafluoroethylene varnish.
7. Sintern bei 400° C, 10-15 Min.7. Sintering at 400 ° C, 10-15 min.
8. Abschrecken in kaltem Wasser.8. Quenching in cold water.
Auch bei flächigem Abrieb bleibt die so hergestellte Polytetrafluoräthylen-Beschichtung in den Ätzgruben ebenso erhalten wie in den Poren der anodisch oxydierten Oberfläche.The polytetrafluoroethylene coating produced in this way remains in the etch pits even with extensive abrasion as well as in the pores of the anodized surface.
Das Aufbringen der Polytetrafluoräthylen-Schicht kann auf einfache Weise durch Tauchen oder Spritzen bei Raumtemperatur mit nachfolgendem Einbrennen erfolgen.The polytetrafluoroethylene layer can be applied in a simple manner by dipping or spraying at room temperature with subsequent stoving.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1965F0045888 DE1546934B2 (en) | 1965-04-23 | 1965-04-23 | Process for the formation of a polytetrafluoroethylene protective layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1965F0045888 DE1546934B2 (en) | 1965-04-23 | 1965-04-23 | Process for the formation of a polytetrafluoroethylene protective layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE1546934A1 DE1546934A1 (en) | 1970-10-22 |
| DE1546934B2 true DE1546934B2 (en) | 1978-04-20 |
Family
ID=7100729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1965F0045888 Withdrawn DE1546934B2 (en) | 1965-04-23 | 1965-04-23 | Process for the formation of a polytetrafluoroethylene protective layer |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1546934B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4124730A1 (en) * | 1991-07-25 | 1993-01-28 | Friebe & Reininghaus Ahc | Intercalation of fluorinated polymer particles - into microporous oxide surfaces of aluminium@, magnesium@ and aluminium@ magnesium@ alloy objects for homogeneous coating of polymers |
| DE4445007A1 (en) * | 1994-12-16 | 1996-06-20 | Fissler Gmbh | Process for equipping a crockery item with a non-stick coating |
| DE4143650C2 (en) * | 1991-07-25 | 2003-09-18 | Ahc Oberflaechentechnik Gmbh | Intercalation of fluorinated polymer particles |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8923302D0 (en) * | 1989-10-16 | 1989-12-06 | Meyer Manuf Co Ltd | Cookware |
| GB9222275D0 (en) * | 1992-10-23 | 1992-12-09 | Meyer Manuf Co Ltd | Cookware and a method of forming same |
| FR2789334B1 (en) * | 1999-02-10 | 2001-03-23 | Jfce | PROCESS FOR THE SURFACE TREATMENT OF ANODIZED ALUMINUM PARTS AND PARTS OBTAINED BY THE IMPLEMENTATION OF THIS PROCESS |
| IL150397A0 (en) * | 2000-01-14 | 2002-12-01 | Astrazeneca Ab | A method for applying a polymer coating to the internal surface of a container |
| ES2385155B1 (en) * | 2010-12-22 | 2013-05-24 | BSH Electrodomésticos España S.A. | Cooking flask |
-
1965
- 1965-04-23 DE DE1965F0045888 patent/DE1546934B2/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4124730A1 (en) * | 1991-07-25 | 1993-01-28 | Friebe & Reininghaus Ahc | Intercalation of fluorinated polymer particles - into microporous oxide surfaces of aluminium@, magnesium@ and aluminium@ magnesium@ alloy objects for homogeneous coating of polymers |
| DE4124730C3 (en) * | 1991-07-25 | 2001-09-06 | Ahc Oberflaechentechnik Gmbh | Anodized objects made of aluminum or magnesium with fluoropolymers embedded in the oxide layer and process for their production |
| DE4143650C2 (en) * | 1991-07-25 | 2003-09-18 | Ahc Oberflaechentechnik Gmbh | Intercalation of fluorinated polymer particles |
| DE4445007A1 (en) * | 1994-12-16 | 1996-06-20 | Fissler Gmbh | Process for equipping a crockery item with a non-stick coating |
| US5989631A (en) * | 1994-12-16 | 1999-11-23 | Fissler Gmbh | Process for equipping a kitchenware object with an anti-adhesion coating |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1546934A1 (en) | 1970-10-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| BHJ | Nonpayment of the annual fee |