Treatment method for making heat exchanger hydrophilic and heat exchanger treated to be hydrophilic
US6554916B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 12, 2001 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | May 12, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F2245/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A treatment method for hydrophilicity for a heat exchanger which can maintain the deodorizing property and hydrohilicity even after a long-time use, and a heat exchanger thus treated for hydrophilicity by said method are provided. After a previous acidic washing treatment, a heat exchanger is subjected to a chemical transformation treatment to form a chemical conversion coating film using a chromium chromate treatment agent, chromium phosphate treatment agent, or treatment agent of zirconium series, followed by a treatment for hydrophilicity using a treatment agent for hydrophilicity, which contains silica particulates and polymer of vinyl alcohol series in aqueous medium in a weight ratio 30:70˜70:30 and in tot al content of 1˜25 weight percent, and in which said silica particulates are coated with said polymer of vinyl alcohol series, and dispersed as coated particles of the average particle diameter of 5˜1000 nm in aqueous medium, to form the coating film so as to amount to 1˜3 g/m2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.