Water repellent coating film, method and apparatus for manufacturing the same, and water repellent coating material composition
US6333074A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2000 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Jan 11, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.