Claims
- 1. A procedure for the application of polytetrafluoroethylene film on aluminum surfaces comprising the following sequence of production phases:
- a) degreasing the aluminum surfaces in an aqueous solution;
- b) washing with water;
- c) an optional rapid bath in a hydrochloric acid solution followed by rinsing in water;
- d) drying;
- e) applying the film on the aluminum surfaces by a rolling process through a set of four machines in which:
- I) the mixture used in the first rolling machine consists of:
- ______________________________________Product 80% by weightthickening solution + coloring 20% by weightpigments______________________________________
- II) the mixture used in the second rolling machine consists of:
- ______________________________________Product 50% by weightpolytetrafluoroethylene 25% by weightthickening solution + coloring 25% by weightpigments______________________________________
- III) the mixture used in the third and fourth rolling machines is an aqueous solution of polytetrafluoroethylene and coloring pigments; whereby the product consists of the following components in the following percentages:
- ______________________________________A) Polyamide-imide 35.714% by weightB) dimethylaminoethanol 7.143% by weightC) water 57.143% by weight______________________________________
- whereby the thickening solution in the mixture used in the first and second rolling machines consists of the following components in the following percentages:
- ______________________________________D) isobutyl alcohol 11.4% by weightE) dichloropropane hexane 9.5% by weightF) alkylphenolethoxylate 79.1% by weight.______________________________________
- 2. A procedure for the application of polytetrafluoroethylene film on an aluminum surface by a rolling process comprising the steps of:
- first degreasing the aluminum surface with an aqueous alkaline solution, washing the degreased aluminum surface with water and drying the aluminum surface,
- second applying a mixture of a product and a thickening solution to the aluminum surface wherein the product is a mixture of polyamide-imide, dimethylaminoethanol and water and the thickening solution is a mixture of isobutyl alcohol, dichloropropane hexane and alkylphenolethoxylate,
- third, applying a mixture of the product, the thickening solution and polytetrafluoroethylene to the aluminum surface,
- and fourth, applying an aqueous solution of polytetrafluoroethylene to the aluminum surface, wherein, in the mixture in the second step, the product is 80% by weight and the thickening solution is 20% by weight and in the mixture in the third step, the product is 50% by weight, the thickening solution is 25% by weight and the polytetrafluoroethylene is 25% by weight.
- 3. The procedure of claim 2, wherein, in the product, the percentage by weight of the polyamide-imide is 35.714%, the percentage by weight of the dimethylaminoethanol is 7.143% and the percentage by weight of the water is 57.143%.
- 4. The procedure of claim 2, wherein, in the thickening solution, the percentage by weight of the isobutyl alcohol is 11.4%, the percentage by weight of the dichloropropane hexane is 9.5% and the percentage by weight of the alkylphenolethoxylate is 79.1%.
- 5. The procedure of claim 2, wherein a set of four rolling machines are used, the first application using a first rolling machine, the second application using a second rolling machine, the aqueous solution of the polytetrafluoroethylene being applied using a third rolling machine and a fourth rolling machine.
- 6. The procedure of claim 2, further adding coloring pigments to the solutions applied to each rolling machine.
Parent Case Info
This application is a continuation of U.S. patent application Ser. No. 07/969,424, file Oct. 30, 1992, now abandoned.
US Referenced Citations (4)
Continuations (1)
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Number |
Date |
Country |
Parent |
969424 |
Oct 1992 |
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