Aerogel material reinforced by fiber reinforcement and preparation method of aerogel material

Abstract

The invention relates to an airgel material reinforced by fiber reinforcement and its preparation method. The width of the material is 0.5-1.5 meters, and the length is 5-30 meters. Its composition includes silicon dioxide airgel and reinforced continuous fiber, and its weight ratio is 1:0.5-2.5. The present invention also relates to (1), limiting and winding the continuous reinforcing fiber into a winding unit while keeping a certain gap between the continuous fibers; (2), disposing silicon alkoxide, alcohol solvent and basic catalyst according to a certain ratio (3) Immerse the silica sol into the continuous reinforcing fiber winding unit through the impregnation process; (4) After the silica gel is aged for a certain period of time, the surface is treated with a hydrophobizing agent; (5) The silica gel containing silica gel The continuous fiber winding unit of glue is supercritically dried. The material prepared by the invention has large specific surface area and low thermal conductivity, and can be applied in many fields such as fire retardation, sound insulation, gas adsorption and the like.

Description

technical field [0001] The invention relates to a preparation method of a fiber-reinforced airgel material, in particular to a preparation method of a fiber-reinforced silica airgel fiber-reinforced airgel material. Background technique [0002] Airgel is a low-density nanoporous amorphous material with a continuous random network structure. Due to the distribution of nanoscale particles and voids in airgel, it has very low thermal conductivity, so it can be used as a light-weight, high-efficiency thermal insulation material (Angew Chem Int Ed. 1998, 37: 22-45). At the same time, due to the special structure of airgel, it also has many functions such as fire prevention, sound insulation, light transmission, adsorption, filtration, etc. It is precisely because of these characteristics that airgel materials are used in thermal, acoustic, optical, microelectronics, particle detection It has very broad application potential (Thin SolidFilms.1997, 297(1-2): 212-217). However, m...

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Problems solved by technology

However, most airgel materials have low strength and high brittleness and are usually difficult to be directly applied in engineering. There are two methods to solve this problem. One is to add adhesive to the prepared airgel powder and then perform secondary molding. The method (Chinese patent 95197068.2); the second is to add reinforcement fibers in the sol-gel process to strengthen the airgel block (US patent US6068882)

At present, the methods involved in all patents are aimed at the preparation of airgel material powder and block, which cannot efficiently prepare airgel material fiber-reinforced airgel material, and it is difficult to meet its engineering preparation and use as a general-purpose thermal insulation material. need

At the same time, due to the low preparation efficiency, the production cost of airgel as a material is relatively high, which causes great difficulties for popularization and application.