Low-temperature resistant perfluoropolyether-based magnetic liquid and preparation method thereof
US11869694B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2023 |
| Grant date | Jan 9, 2024 |
| Priority date | — |
| Expiry date | Jun 20, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0054
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A preparation method of a perfluoropolyether-based magnetic liquid includes dispersing magnetic nanoparticles coated with graphene oxide into a solution of N,N-dimethylformamide to obtain solution A; dispersing a surfactant into dichloromethane, and adding triethylamine as a cosolvent to obtain solution B; mixing the solution A and the solution B uniformly, heating them under reflux and stirring them for a modification reaction; and after the modification reaction is completed, washing and drying a reaction product to obtain the modified magnetic nanoparticles coated with the graphene oxide; dispersing the modified magnetic nanoparticles coated with the graphene oxide into a base carrier liquid to prepare the perfluoropolyether-based magnetic liquid. The surfactant is a perfluoroalkylamine. The base carrier liquid is a perfluoropolyether oil. The modification reaction is performed at a temperature of 50 to 120° C. for a time period of 20 to 50 hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.