Superhydrophobic polyvinylidene fluoride (PVDF) aerogel material and preparation method thereof

Abstract

The invention relates to a superhydrophobic PVDF aerogel material. The superhydrophobic PVDF aerogel material is characterized in that the material is a white opaque blocky material with a density of0.075-0.198 g / cm<3>, a porosity of 89-95.8%, a specific surface area of 256-343 m<2> / g, a water contact angle of 153-158 degrees and a thermal conductivity of 0.03531-0.04463 W / (m.K); and the materialhas a hierarchical pore structure, wherein the sizes of nanopores are in a range of 3-100 nm, and the sizes of micropores are in a range of 0.5 to 5 [mu]m. A PVDF aerogel is prepared by using a physical sol-gel process based on a phase inversion method. A preparation method for the PVDF aerogel comprises the following steps: subjecting PVDF powder and an additive to dissolving and uniform mixingin an organic solvent at a certain temperature; then adding deionized water and allowing PVDF to undergo phase inversion so as to form a PVDF gel; and subjecting the PVDF gel to solvent replacement and drying successively to prepare the PVDF aerogel. A novel preparation method is adopted in the invention to prepare the novel superhydrophobic PVDF aerogel material, and the method is simple in process and easy to realize industrial production; and the prepared PVDF aerogel material has low thermal conductivity and is a heat insulation material applicable to low-temperature humid environments.

Description

technical field [0001] The invention belongs to the field of preparation of new materials, and relates to a superhydrophobic polyvinylidene fluoride PVDF airgel material and a preparation method thereof. Background technique [0002] As a nanoporous material, airgel has a three-dimensional nanoporous network structure, endowing it with low density, high specific surface area, large porosity and other characteristics, which can effectively limit heat transfer, and is an ideal high-performance thermal insulation material. The thermal conductivity under normal pressure is generally below 0.02W / (m K), which is much better than traditional insulation materials. It is the solid material with the lowest thermal conductivity and can be used in industrial production, building energy saving, aerospace and other fields. At present, the most researched and commercialized is SiO 2 Airgel insulation, but SiO 2 Airgel has low strength and high brittleness, resulting in SiO 2 Airgel insu...

AI Technical Summary

Problems solved by technology

At present, the most researched and commercialized is SiO 2 Airgel insulation, but SiO 2 Airgel has low strength and high brittleness, resulting in SiO 2 Airgel insulation materials generally have the problem of "dropping powder and slag", which not only limits SiO 2 The use of airgel insulation materials is not conducive to environmental protection and the health of production and construction personnel

SiO can be improved to some extent by surface hydrophobic modification 2 The powder and slag problem of airgel, but this problem cannot be fundamentally changed, and the surface modification will destroy SiO 2 Pore ​​Structure of Airgel Thermal Insulation Materials

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