Preparation method of non-shedding elastic-aerogel-coated long fiber composite material

Abstract

The invention relates to a preparation method of a non-shedding elastic-aerogel-coated long fiber composite material. The preparation method comprises the following steps: S1. mixing an ethyl orthosilicate hydrolysate and an acidic silica sol to obtain a first mixture; S2. mixing a modified silica sol hydrolysate and ammonia water to obtain a second mixture; S3. mixing the first mixture and the second mixture to obtain a mixed gel material; S4. immersing long fibers in the mixed gel material to obtain an elastic gel composite; and S5. drying the elastic gel composite to obtain the composite material. By adopting the quick gel technique of mixing the two prepared mixtures, the volume ratio can be adjusted to adjust the density and composition of the aerogel, thereby preparing the gel material continuously and stably, and ensuring no shedding of the composite material in case of no violence. An inorganic silicon source is properly introduced into the organic silicon source in the first mixture, thereby effectively lowering the production cost.

Description

Technical field [0001] The invention relates to the technical field of thermal insulation and fireproof materials, in particular to a preparation method of an elastic aerogel composite material with thermal insulation, fire prevention and noise reduction functions, no powder shedding, and fiber reinforcement. Background technique [0002] Aerogel is a porous material with extremely high porosity (>90%) composed of nano-skeleton structure and the pores formed. The average pore diameter of aerogel is smaller than the mean free path of molecular motion in the air. Due to its special structural characteristics, aerogel can effectively inhibit heat conduction and convection. It is recognized as the solid material with the best thermal insulation performance (thermal conductivity) It can be as low as 0.007W / (m·K)), and it is also considered to be one of the most promising materials in the future. [0003] Since the aerogel itself is relatively brittle, the prior art generally uses fi...

AI Technical Summary

Problems solved by technology

At present, the airgel materials sold in the heat insulation market are all silica airgel composite materials (coils and plates), and most of the airgel exists in the form of powder, which is mainly caused by formula and production Process: (1) In order to reduce the cost of raw materials, low-cost inactive silicon sources such as water glass are used. The gel formed by this silicon source has low strength and is easy to pulverize itself; (2) The gel has undergone multiple solvent replacements and aging During the modification process, the pore structure is destroyed and collapsed, leading to gel pulverization; (3) The commonly used supercritical drying medium is carbon dioxide. During the drying process of the gel, due to the difference between the gel pore medium and the supercritical fluid medium, it is extremely difficult to Easy to cause gel cracking and pulverization

[0004] Airgel pulverization leads to a high thermal conductivity of the material and a particularly serious powder loss rate, which is a fatal shortcoming of commercially available airgel materials

If the pulverization of airgel cannot be overcome, the super thermal insulation performance of airgel materials will be difficult to fully exert, and it will also bring problems such as construction difficulties, environmental pollution, and health effects, which will limit the promotion and application of airgel materials.