Preparation method of hot-pressing setting silicon dioxide aerogel felt

Abstract

The invention relates to a preparation method of a hot-pressing setting silicon dioxide aerogel felt. The preparation method comprises the following steps: adding a hot-melting fiber material into glass wool of an aerogel felt substrate material; preparing a silicon dioxide acid sol by taking organic silicon as a precursor, lower alcohol as a solvent and inorganic or organic acid as a catalyst; adding the prepared silicon dioxide acid sol into a water / alcohol solution of ammonia water and the like for pH regulation, and performing saturation immersion on a mixed glass wool carrier; after gelling, performing supercritical extraction; performing modification after the extraction; and performing hot pressing of the prepared aerogel felt at a temperature of 60-300 DEG C under a pressure of 0.01-5MPa. Platy aerogel thermal insulation products of irregular shapes can be prepared by use of different forming devices; and moreover, the surface hydrophobicity of the products is not influenced, the aerogel powder drop is avoided, and the thermal insulation requirement of irregular surfaces can be met.

Description

technical field [0001] The invention relates to a silica airgel felt, in particular to a method for preparing a heat-pressable silica airgel felt. Background technique [0002] With the current energy problems becoming more and more prominent, energy saving and emission reduction has become a hot spot in current research. Due to its excellent heat insulation ability, silica airgel materials are more and more widely used in the field of heat preservation. Using nano-silica airgel materials can not only greatly reduce the thickness of the insulation layer, but also because the silica gas The gel material is basically composed of silica and glass fiber, without any harmful pollution to the environment, and is an ideal substitute for thermal insulation materials. [0003] However, at present, aerogels are mostly sheets or coils, which are only used for pipe insulation and regular surface insulation areas. There are few studies on special-shaped parts required for irregular surf...

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Problems solved by technology

[0003] However, at present, aerogels are mostly sheets or coils, which are only used for pipe insulation and regular surface insulation areas. There are few studies on special-shaped parts required for irregular surfaces, and at present, most of the special-shaped parts are prefabricated special-shaped supports. Then apply gel on the support, and remove the internal solvent by supercritical extraction. The production efficiency is extremely low, resulting in high cost of special-shaped parts. At the same time, because the process of applying gel to special-shaped parts is not easy to control, the surface condition is poor. There are phenomena such as falling powder and uneven distribution of airgel. In actual use, an additional protective layer is required, which reduces the average heat insulation capacity of the product.