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Use of a catalyst in a base coating to improve the strippability of subsequent coatings

a catalyst and coating technology, applied in the direction of coatings, chemistry apparatus and processes, cleaning using liquids, etc., can solve the problems of difficult or impossible stripping of intercoat adhesion and chemical resistance, and none of them have provided the balance required for acceptable performan

Inactive Publication Date: 2012-06-28
AKZO NOBEL COATINGS INT BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a method for removing additional coatings from a surface that has a barrier primer coat with a catalyst for decomposing hydrogen peroxide. The method involves using a stripping agent made of hydrogen peroxide at specific reaction conditions. The technical effect of this invention is to provide a more efficient and effective way to remove additional coatings from surfaces without causing damage or compromising the quality of the surface.

Problems solved by technology

Systems that offer very good intercoat adhesion and chemical resistance are difficult or impossible to strip with mild paint removers such as those based on emulsions of benzyl alcohol in water.
To date, none of them have provided the balance required for acceptable performance.

Method used

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  • Use of a catalyst in a base coating to improve the strippability of subsequent coatings
  • Use of a catalyst in a base coating to improve the strippability of subsequent coatings
  • Use of a catalyst in a base coating to improve the strippability of subsequent coatings

Examples

Experimental program
Comparison scheme
Effect test

example 1

Three Layer Coating System with Good Intercoat Adhesion but Poor Strippability

[0041]a. Barrier Primer (BP1) was applied at 1 mil dry film thickness over a suitable substrate.

b. Intermediate Coating (ICI) was applied at 1 mil dry film thickness over the barrier primer.

c. Decorative topcoat was applied at 2 to 3 mils dry film thickness over the intermediate coating.

[0042]Rain erosion, phosphate ester resistance and strippability tests were performed on the composite coating. The resulting test panels are depicted in FIG. 1. A review of the test panels reveals the following results:

Rain erosion resistance (as shown by rain erosion airfoils)—excellent, no adhesion loss

Phosphate ester resistance—excellent, no softening or undercutting along scribe

Strippability—no removal after 24 hours exposure to SPC-909 stripper

[0043]This system has very good intercoat adhesion as shown by the rain erosion airfoils, and also has excellent resistance to phosphate ester hydraulic fluids. However, it was ...

example 2

Coating System with Good Strippability but Poor Intercoat Adhesion and Phosphate Ester Resistance

[0044]a. Barrier Primer (BP1) applied at 1 mil dry film thickness over a suitable substrate.

b. Intermediate Coating (IC2) applied at 1 mil dry film thickness over the barrier primer.

c. Decorative topcoat-2 component urethane topcoat designated as Eclipse® applied at 2 to 3 mils dry film thickness over the intermediate coating.

[0045]Rain erosion, phosphate ester resistance and strippability tests were performed on the composite coating. The resulting test panels are depicted in FIG. 2. A review of the test panels reveals the following results:

Rain erosion resistance—poor, adhesion loss up to 1.25 inches from leading edge

Phosphate ester resistance—some undercutting and lifting along scribe

Strippability—topcoat was removed after 24 hours exposure to SPC-909 stripper.

[0046]This system was strippable, but had poor rain erosion resistance. Another disadvantage of this system is that phosphate ...

example 3

Coating System Using Barrier Primer with 10% Manganese Dioxide by Dry Film Volume

[0047]a. Barrier primer (BP2) applied at 1 mil dry film thickness over a suitable substrate.

b. Intermediate Coating (IC1) applied at 1 mil dry film thickness over the barrier primer.

c. Decorative topcoat-2 component urethane topcoat designated as Eclipse® applied at 2 to 3 mils dry film thickness over the intermediate coating.

[0048]Rain erosion, phosphate ester resistance and strippability tests were performed on the composite coating. The resulting test panels are depicted in FIG. 3. A review of the test panels reveals the following results:

Rain erosion resistance—excellent, no adhesion loss

Phosphate ester resistance—excellent, no softening or undercutting along scribe

Strippability—decorative and intermediate coats were completely removed down to the barrier primer after 4-5 hours exposure to SPC-909 stripper. Similar results were achieved with the 022409 stripper.

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Abstract

The invention is a method of stripping one or more additional coats covering a barrier primer coat that covers a surface. The barrier coat contains a catalyst, such as manganese dioxide and, or, manganese carbonate, for the decomposition of hydrogen peroxide. The top coat of the covered surface is contacted with the stripping agent at decomposition reaction conditions.

Description

[0001]This application claims priority based on U.S. Provisional Application No. 61 / 237,490, filed Aug. 27, 2009, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The field to which this invention relates is the stripping of coatings from a surface.PRIOR ART[0003]Systems that offer very good intercoat adhesion and chemical resistance are difficult or impossible to strip with mild paint removers such as those based on emulsions of benzyl alcohol in water.[0004]A number of different resin systems and additives have been tried as or in intermediate coatings and barrier primers to obtain the best possible balance between rain erosion and strippability. To date, none of them have provided the balance required for acceptable performance.[0005]References such as U.S. Pat. Nos. 3,654,940; 5,830,836; and 5,954,890 disclose use of hydrogen peroxide for stripping polymeric coatings from surfaces, particularly non-porous substrates, such as an aircraft body....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B08B3/08
CPCC09D9/00B08B3/08C23G5/00
Inventor ZENTNER, MARK ROBERT
Owner AKZO NOBEL COATINGS INT BV