Hydrophilic zeolite coating
US6500490B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 2000 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Mar 23, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F2265/20
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A hydrophilic coating can be optionally corrosion resistant and/or microbial resistant for a substrate such as a heat exchanger. The coating is provided by a zeolite layer that can be formed from a synthesis solution comprising a structure directing agent, a base, a silicon source, an aluminum source, and a solvent. In one preferred embodiment, the synthesis solution comprises tetrapropylammonium hydroxide, sodium hydroxide, aluminum oxide, tetraethylorthosilicate, and water. The layer is characterized by a zeolite MFI structure and by a composition having the formula of Mn/m[AlnSi(96−n)O192], or [AlnSi(96−n)O192]·4[(CH3CH2CH2)4N—OH] wherein M is a metal ion of valence m+ (e.g., Na+) and 27>n>=0. After formation of the coating, the organic structure directing agent can be left intact inside the zeolite coating to make the coating corrosion resistant. Alternatively, and after removal of the organic structure directing agent, a biocidal metal ion can be incorporated into the coating by an ion exchange process to render the coating microbial resistant. A hydrophilic coating that is also corrosion resistant and microbial resistant can be made by a zeolite coati…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.