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US 5,264,250 AGranted
Antimicrobial hydrophilic coating
AssigneeUnited Technologies Corporation
InventorsJohn W. Steele, Philip J. Birbara, Robert W. Marsh, Timothy D. Scull
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Abstract
Heat transfer surfaces in condensing heat exchangers are often coated with a hydrophilic coating to provide wetting and wicking. This coating is typically porous and continuously moist during operation and, therefore, a potential breeding ground for microbes. The inclusion of an antimicrobial agent, such as silver oxide, in the coating inhibits microbial growth and improves adhesion to the heat transfer surfaces.
Claims8
A method for coating heat transfer surfaces of a condensing heat exchanger with an antimicrobial hydrophilic coating, comprising the steps of:
- a. flowing the coating in the form of a slurry through said condensing heat exchanger, wherein said slurry intimately contacts and coats said heat transfer surfaces;
- and
- b. heating said coated heat transfer surfaces to dry and cure said slurry thereby forming a coating on said heat transfer surfaces,
- wherein said slurry is comprised of:
- a. an adhesive agent;
- b. an insolubilizer;
- c. an inorganic compound wherein said inorganic compound is selected from the group consisting of silica, calcium silicate, and mixtures thereof;
- d. from about 0.1 wt. % to about 1.0 wt. %, based upon the total weight of the slurry, of silver oxide;
- and
- e. a solvent;
- whereby said adhesive agent, said insolubilizer, said inorganic compound, and said silver oxide are dispersed in said solvent thereby forming a slurry which is essentially homogeneous.
8 more elements
Dependencies are inferred from the claim text.