A kind of preparation method of airgel blanket thermal insulation material

Abstract

The invention belongs to the field of thermal insulation materials and discloses a preparation method of an airgel blanket thermal insulation material. Mix orthosilicate, ethanol and water evenly, and add NH 4 Stir F solution and ammonia water evenly to obtain silica sol A; stir and mix resin, initiator, coupling agent, and hollow glass microspheres in a sealable container to obtain slurry B; Soak in the freshly prepared slurry B after taking it out, repeat the operation 3~4 times and the silica sol A is always in a stirring state when the fiber mat is dipped in the slurry B, then take out the fiber mat and place it in a vacuum The airgel blanket is sealed and left standing under the condition; the obtained fiber felt is subjected to aging and modification treatment, then solvent replacement is carried out with absolute ethanol, and then drying treatment and heat treatment are carried out to obtain the airgel felt heat insulation material. On the premise of not affecting the thermal insulation effect of the felt body, the invention overcomes the problem of powder falling off in the traditional silica airgel felt.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a preparation method of an airgel felt thermal insulation material. Background technique [0002] Airgel is a nanoporous material with a porosity as high as 80~99.8%, and its specific surface area can reach 200~1000m 2 / g, the density of airgel is extremely low, it is currently the lightest solid in the world, in addition, airgel also has low thermal conductivity (minimum 0.01W / m K), high porosity (up to 99%) , High light transmittance (up to 99%), low dielectric constant (as low as 1.0~2.0), low refractive index (as low as 1.05), etc. [0003] SiO 2 Compared with other traditional heat insulation materials, airgel felt has unparalleled advantages. It is the solid material with the best performance of heat insulation materials at present, and it is the first choice material for energy saving and consumption reduction. However, due to the structural chara...

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Problems solved by technology

However, due to the structural characteristics of airgel, airgel has disadvantages such as high brittleness and poor flexibility. At the same time, due to its preparation method, SiO 2 During the transportation, construction and use of airgel blankets, it is common for airgel powder to fall off from the felt body. The powder loss not only brings inconvenience to the construction, but also poses a threat to the health of the construction workers, and also reduces air condensation. The performance of the rubber felt itself greatly limits the application range of the airgel felt

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