Water repellent coating film, method and apparatus for manufactu

Details Water repellent coating film, method and apparatus for manufactu Water repellent coating film, method and apparatus for manufactu

1997-01-31

2000-03-28

Moore, Margaret G.

Stock material or miscellaneous articles

Composite

Of silicon containing

428377, 428405, 428457, 428704, 10628716, 10628719, 10628713, B32B 904

Patent

active

060429488

ABSTRACT:
By forming a film that comprises a microcrystalline polymer having at least a fluorocarbon group and has a rough surface on a surface of a base material, super-water-repellency is provided, the dew condensation water of an air conditioner, for example, can be easily removed, and the freezing of the fin of the heat exchanger can be prevented. A fin that is made of aluminium is coated with a solution for forming a coating film, in which CF.sub.3 (CF.sub.2).sub.7 --(CH.sub.2).sub.2 --SiCl.sub.3 is diluted with nonaqueous cyclohexamethyl trisiloxane at a concentration of 10 vol. % for preparation, to a thickness of 1 to 10 .mu.m by a brush, and then the cyclohexamethyl trisiloxane is vaporized in an atmosphere having a relative humidity of about 75% at room temperature. CF.sub.3 (CF.sub.2).sub.7 --(CH.sub.2).sub.2 --SiCl.sub.3 that remained on the fin is rapidly hydrolyzed with the moisture in the atmosphere, and the moisture in air and a --SiCl.sub.3 group dehydrochlorinated to form a microcrystalline polymer on the fin. As a result, a coating film having a surface roughness in the range of 1 to 40 .mu.m and a contact angle of about 171.degree. to water can be formed.

REFERENCES:
patent: 5266222 (1993-11-01), Willis et al.
patent: 5545255 (1996-08-01), Ogawa

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