Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1987-05-20
1988-12-13
Lieberman, Paul
Coating processes
With post-treatment of coating or coating material
Heating or drying
4274191, 106 1421, 148 616, B05D 302, C09D 510
Patent
active
047910089
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to coating compositions and to the use thereof for the purpose of improving properties of substrates which can be used in a wide variety of applications. This invention relates also to an aqueous glazing composition which can be applied to a relatively porous and/or rough inorganic base coating and which can be cured into a coating which imparts desired properties to the underlying coated substrate.
It is known to apply directly to metallic and other types of substrates coatings which protect the substrate from corrosive elements and/or which have other beneficial properties. One type of coating composition that is useful for protecting various types of substrates under high temperature and highly corrosive conditions is an inorganic composition containing dissolved phosphate, dissolved dichromate or molybdate, solid particulate material such as powdered metal, powdered metallic alloys, and refractory metal oxides, and optionally, dissolved metal, for example, aluminum, magnesium, sodium, or zinc. Examples of such coating compositions are disclosed in a publication entitled "Investigation of Aluminum Phosphate Coatings for Thermal Insulation of Air Frames," by Eubanks and Moore, National Aeronautics and Space Administration (NASA Technical Note D-106, 1959) and U.S. Pat. No. 3,248,251 to Allen. Coatings formed from the aforementioned type composition have corrosion resistant and/or other beneficial properties, depending on the specific solid particulate material used in the composition and the amount applied directly to the substrate. Examples of such other properties include high heat resistance, abrasion resistance and electrical characteristics. For example, coatings having particularly high heat resistance include a refractory metal oxide such as powdered quartz or alumina (Al.sub.2 O.sub.3).
For use in certain applications, industrial standards require that coatings of the aforementioned type have excellent adhesive and corrosion-resistant properties after being evaluated in each of the following tests: (1) 5% salt spray for a minimum of 144 hours; (2) 100% relative humidity at 100.degree. F. for a minimum of 144 hours; (3) hot water (180.degree. F.) for a minimum of 24 hours; (4) steam vapor for a minimum of 144 hours; and (5) hot saline condensates for a minimum of 24 hours.
Articles coated with the aforementioned type of coatings can be used in various applications where they otherwise would not be suitable for use, including aerospace, automotive, marine and metal working applications. However, such coatings are not entirely suitable for all uses. For example, they do not possess the surface smoothness desired for certain aerospace applications and the properties thereof can be eroded over time when they are subjected to the harshest of conditions. For these more demanding uses, an overlying or glaze coating may be required to improve the surface or other characteristics of the coated article.
Glaze coatings are prepared by applying to the underlying coating (also referred to herein as "base coating") a glazing composition, the usefulness of which is dependent on its ease of application and the appearance of the cured glaze. For many applications, a glazing composition is considered unacceptable if it is not easy to apply to a substrate, that is, it wets the surface unevenly or sags, thereby resulting in surface flaws, including mottling, cracking or blistering. These types of surface flaws result frequently in a decrease in other desireable properties, such as corrosion resistance and surface smoothness.
This invention relates to an improved coating composition, including one which can be used to form a glaze coating on an underlying coating and which can be used to improve the corrosion-resistance, scratch-resistance, surface smoothness and appearance of coated articles.
PRIOR ART
U.S. Pat. No. 4,381,323 (hereinafter the '323 patent) to J. M. Klotz and G. A. Collins, Jr. discloses a coating composition which is described as being useful for formi
REFERENCES:
patent: 4319924 (1982-03-01), Collin, Jr. et al.
patent: 4381323 (1983-04-01), Lowe et al.
Klotz Brian L.
Klotz James M.
Coatings for Industry, Inc.
Lieberman Paul
McNally John F.
Savitzky Martin F.
Synnestvedt John T.
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