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US 11,885,071 B2Granted
Aramid-mica composite insulating nanopaper and preparation method thereof
AssigneeShaanxi University of Science and Technology
InventorsZhaoqing Lu, Fengfeng Jia, Songfeng E, Li Hua
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Abstract
An aramid-mica composite insulating nanopaper and a preparation method thereof are disclosed. A mixture of mica and urea is subjected to a solid-phase ball milling, to obtain nano mica modified with amino groups on the surface, which is then assembled with the aramid nanofiber by stepwise suction filtration according to the present disclosure, to form an ordered nanopaper, thereby obtaining an aramid-mica composite insulating nanopaper with ultra-high insulation performances.
Claims9
A method for preparing an aramid-mica composite insulating nanopaper, comprising,
- ball milling and mixing mica and urea to obtain a ball-milled material;
- washing the ball-milled material to remove free urea from the ball-milled material to obtain a washed solid;
- dispersing the washed solid in water to obtain a dispersion;
- subjecting an aramid nanofiber dispersion to a first vacuum filtration to obtain a solid;
- adding the dispersion to the solid to obtain a mixture;
- subjecting the mixture to a second vacuum filtration to obtain a mixed solid;
- performing in sequence a third vacuum filtration and a fourth vacuum filtration on the mixed solid to obtain a final mixed solid;
- and
- drying the final mixed solid to obtain the aramid-mica composite insulating nanopaper.
6 more elements
Dependencies are inferred from the claim text.