Abstract:

 The film-forming method is used to break through the traditional process and effectively combine SiO₂aerogels, phase change materials and textile materials to prepare lightweight and high-performance insulation films. By changing the process parameters that directly affect the thickness of the film, such as the thickness of the blade, the speed of the blade, the ratio of absolute ethanol and distilled water, etc., the thermal insulation film with different thickness and performance parameters can be obtained. The rules of the thermal protective performance of multilayer fabrics with the film are revealed. Effects of process parameters on thermal protective performance of firefighters' protective materials are evaluated. The results show that the second-degree skin burn time increases first and then decreases with the increase of the film thickness and the scraper speed. As the theoretical thickness is 500 μm or the scraper speed is 50 mm/s, the best thermal protective performance of multilayer fabrics is obtained. And as the ratio of anhydrous ethanol and distilled water is 5:3, the best thermal protection is given. The research results obtained in this paper provide necessary theoretical basis for scientific and rational design and preparation of high performance thermal insulating film and development of lightweight thermal protective clothing with excellent performance.

Key words:  , SiO₂ , aerogel, micro encapsulated phase change materials, firefighters' protective clothing, thermal insulating film, process parameters, thermal protection