In-situ hydrophobic modified aramid nano aerogel fiber as well as preparation method and application thereof

Abstract

The invention discloses in-situ hydrophobic modified aramid nano aerogel fiber as well as a preparation method and application thereof. The preparation method comprises the following steps of providing an aramid nano spinning solution; preparing hydrophobic modified aramid nano gel fiber by adopting a spinning technology, wherein a coagulating bath adopted by the spinning technology comprises a first organic solvent and a halogenating reagent, and the halogenating reagent comprises monobromoalkane, monochloroalkane, dibromoalkane, dichloroalkane, trichloroalkane and the like; and then carrying out drying treatment to obtain the in-situ hydrophobic modified aramid nano aerogel fiber. The in-situ hydrophobic modified aramid nano aerogel fiber prepared by the method has a unique three-dimensional porous network structure, lower heat conductivity, higher porosity, higher tensile strength and elongation at break and certain spinnability and structural stability, and can be applied to the field of spinning; a fabric woven from the hydrophobic fiber has self-cleaning ability; hydrophobic aramid nano aerogel fiber flocculus can also be prepared; and good hydrophobic performance is showed.

Description

technical field [0001] The present invention relates to a novel functional fiber and its modified preparation method, in particular to an aramid nano-airgel fiber modified in situ hydrophobically during the spinning process and its preparation method and application, belonging to nanoporous materials and Functional fiber technology field. Background technique [0002] With the development of science and technology, airgel materials have been applied in many aspects. It is a nanoporous solid material with colloidal particles or polymer molecules accumulated into a network structure, and its dispersion medium is gas. Generally, airgel materials have extremely low apparent density, large specific surface area, high porosity and low thermal conductivity. The most important thing is that airgel materials have rich mesoporous structures, and mesoporous pores with a pore size of 2-50 nm are ideal functional material carriers, but it is precisely because of the existence of porous ...

AI Technical Summary

Problems solved by technology

However, due to the existence of a large number of amide bonds in the aramid fiber structure, the airgel fiber is hydrophilic, and the general contact angle is about 67°. It must be used in a dry and anhydrous environment, otherwise the porous structure of the airgel will be damaged at room temperature. Under normal pressure, it is easy to absorb water and cause the skeleton to shrink and collapse, so it is necessary to hydrophobically modify the aramid nano-airgel fiber

[0004] At present, it has been reported that fluorocarbons are used to modify the surface of fibers hydrophobically, but fluorocarbons are easy to fall off during use, resulting in unsustainable performance, and it is a post-treatment process, which makes the preparation more complicated

Therefore, it is challenging to achieve hydrophobic modification of porous materials in situ without destroying the bulk properties of porous materials.

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