Aluminum silicate composite fiber reinforced aerogel felt and preparation method thereof

Abstract

The invention discloses a preparation method of an aluminum silicate composite fiber reinforced aerogel felt, which comprises the following steps: uniformly mixing orthosilicate, ethanol and water, sequentially adding an NH4F solution and ammonia water, and uniformly stirring the mixture to obtain silicon dioxide sol; alternately stacking and paving according to the sequence of the flexible fiberweb and the aluminum silicate fiber web, so as to obtain a fiber felt body; dispersing the hot melt adhesive powder and short fibers in water, uniformly stirring the mixture to obtain viscous slurry,coating and infiltrating the viscous slurry into the fiber felt body under a vibration condition, carrying out hot press molding, carrying out impregnation treatment in silicon dioxide sol, performingstanding treatment for aging, placing in absolute ethyl alcohol for solvent replacement, removing water, and drying the semi-product to obtain the aluminum silicate composite fiber reinforced aerogelfelt. The fiber felt body prepared by the method has certain flexibility, the brittleness problem of the felt body can be effectively solved, the application requirement in a high-temperature environment is met, and meanwhile, the fiber felt body has good mechanical properties and can be expanded to be used in different fields.

Description

technical field [0001] The invention belongs to the technical field of airgel felt preparation, and in particular relates to an aluminum silicate composite fiber reinforced airgel felt and a preparation method thereof. Background technique [0002] Silica airgel is a continuous three-dimensional network structure formed by the aggregation of nanoscale particles. Because of its special nanoscale micropores and skeleton structure, its thermal conductivity efficiency, convective heat transfer efficiency and radiation heat transfer efficiency All have been effectively restricted, so airgel has a very low thermal conductivity, which is currently the solid material with the lowest thermal conductivity in the world. And its material is composed of inorganic substances, which belong to Class A non-combustible materials. This material can replace the application of existing organic thermal insulation materials in industrial building thermal insulation systems. However, due to the lo...

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Problems solved by technology

However, due to the disadvantages of poor tensile properties and poor resilience of ceramic fibers, it is easy to cause fiber breakage during the fiber mat impregnation process, which in turn affects the heat insulation performance of the felt body.