Electrospun micro-nanofiber reinforced aerogel flexible thermal insulation material and its preparation method

Abstract

Belonging to the field of heat preservation and thermal insulation materials, the invention puts forward an electrospun micro-nanofiber reinforced aerogel flexible thermal insulation material and its preparation method. The method takes electrospun micro-nanofiber as a reinforcement body, which is mixed with an SiO2 sol. A sol-gel process is employed to prepare an electrospun micro-nanofiber and aerogel composite thermal insulation material with a stable structure under normal temperature and pressure conditions. The method provided in the invention employs micro-nanoscale electrospun micro-nanofiber to reinforce the aerogel, so that the composite material can have better flexibility, interface bonding property and structural integrity. While the mechanical properties of the aerogel thermal insulation composite material are improved, the material also can maintain good thermal insulation performance.

Description

technical field [0001] The invention relates to an airgel flexible thermal insulation material reinforced by electrospun micro-nano fibers, which belongs to the field of thermal insulation materials. Background technique [0002] With the development of economy and society, human beings have an increasing demand for energy, but with the massive exploitation of fossil energy, the reserves continue to decline, and it is urgent for human beings to seek new energy and improve energy utilization. On the long way to seek new energy, people have devoted a lot of energy to research on how to improve energy utilization, and thermal insulation materials have become one of the research directions that cannot be ignored. It can effectively reduce the heat exchange between the medium and its environment, and is widely used in building materials, energy storage equipment, aerospace vehicles, and thermal insulation clothing. [0003] Airgel is the solid substance with the lowest density a...

AI Technical Summary

Problems solved by technology

Compared with the brittleness of the inorganic fiber component, due to the flexibility of the polymer fiber itself, using polymer fiber as a reinforcing phase to improve the mechanical properties of airgel, especially the flexibility, has achieved remarkable results, but similar to the larger diameter of the inorganic fiber, the polymer fiber The diameter (about tens of microns) is much larger than the nanopore diameter of airgel, and it is easy to produce cracks in the drying process of the fiber / aerogel composite gel, which not only affects the mechanical structure stability of the fiber / aerogel composite, but also Increasing the gas-phase thermal conductivity of the composite material reduces the thermal insulation performance of the composite material; in addition, the polymer fiber has a poor effect on infrared composite shielding in the high temperature section, and the polymer fiber / aerogel composite material has a large thermal conductivity in the high temperature section

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