Preparation method of PVDF/silicon dioxide aerogel membrane material

Abstract

The invention discloses a preparation method of a PVDF / silicon dioxide aerogel membrane material, and belongs to the field of nano thermal insulation materials. According to the method, PVDF and silicon dioxide aerogel are prepared into a spinning precursor solution, a PVDF fiber / silicon dioxide aerogel non-woven membrane material is prepared through two sets of needle heads by adopting the electrostatic spinning technology, then the PVDF / silicon dioxide aerogel membrane material is formed through hot pressing, and the prepared PVDF / silicon dioxide aerogel membrane material is good in flexibility and free of powder falling.

Description

technical field

[0001] The invention relates to a method for preparing a PVDF / silicon dioxide airgel membrane material, which belongs to the field of nano thermal insulation materials. Background technique

[0002] Airgel is a network porous structure with high porosity. It is the best material for thermal insulation among existing materials. The particle size of its powder is generally above 10 microns. Because its density is only 40 kg / m 3 , so it will float in the air for a long time during use, causing dust pollution problems. The airgel felt currently on the market is a composite product of airgel and glass fiber, and the powder shedding is serious during use. This is mainly because the glass fibers are too thick to hold the airgel powder inside the mat. If the airgel powder is to be completely fixed inside, nano-scale fibers are needed to fix the airgel in the membrane well, otherwise dust pollution will easily occur. While conventional spinning process is difficult...