Coating composition

Details Coating composition Coating composition

1975-01-21

1978-04-25

Hayes, Lorenzo B.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 1434, 10628716, C09D 510

Patent

active

040860957

ABSTRACT:
Improved zinc-containing coating compositions are useful to protect ferrous-containing surfaces. They are particularly useful and highly protective against red rust. The compositions with higher zinc content can be used as very thin coatings. Those having lower zinc content are used to provide preferably a thicker coating. The compositions contain: metallic zinc in particulate form, e.g., zinc dust or zinc flake; a polyol silicate; a chromate composition selected from strontium chromate, calcium chromate, barium chromate, lead chromate plus lead sulfate (chrome yellow & primrose) and a mixture of zinc chromate and zinc oxide or hydroxide; and a liquid organic vehicle. When zinc dust is used as the particulate zinc, finely divided inert extenders, such as iron phosphide, may be incorporated in the composition; in such composition the zinc content of the combination can be lower without impairing the protective action provided by a coating of the composition. The polyol silicate is a solvent-soluble polyol silicate ester-exchange reaction product of (1) an organic silicate consisting essentially of ortho or poly silicates having ester-exchangeable groups of 1 to 6 carbon atoms selected from the group consisting of alkyl, hydroxyalkyl, alkoxyalkyl, and hydroxyalkoxyalkyl, siloxanes thereof, and their mixtures, and (2) a polyol which is ester-exchangeable with (1). The composition containing zinc flake, polyol silicate and strontium chromate is a preferred composition as it can provide very highly protective rust-free thin coatings of 0.05 to 0.2-mil dry thickness, that offer the advantages of a preconstruction weld-thru coating having improved flexibility for forming operation processes.

REFERENCES:
patent: 2450327 (1948-09-01), Cogan
patent: 3056684 (1962-10-01), Lopata et al.
patent: 3392130 (1968-07-01), Rucker et al.
patent: 3489709 (1970-01-01), Halsey
patent: 3615730 (1971-10-01), Law
patent: 3730746 (1973-05-01), Boaz
patent: 3804639 (1974-04-01), Trulsson et al.
patent: 3859101 (1975-01-01), Slater

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