3D printing aramid airgel, its preparation method and application

Abstract

The invention discloses a 3D printing aramid aerogel, a preparation method and application thereof. The preparation method includes: at least uniformly mixing aramid nanofibers and a solvent to form an aramid nanofiber dispersion; obtaining a 3D printed aramid aerogel through a freezing-direct writing method, sol-gel conversion and drying. In the present invention, surface hydrophobic modification and filling modification are respectively performed on the 3D printed aramid aerogel to obtain hydrophobic materials, photochromic materials and temperature-responsive materials, respectively. The preparation method of the 3D printing aramid aerogel of the present invention has wider dispersibility, lower energy consumption, faster low temperature response, higher printing accuracy, simple process, short process, and the obtained 3D aramid aerogel The gel has ultra-low density, good mechanical properties, and structural designability, and can be used in the fields of thermal insulation, catalysis, separation / adsorption, sensing and soft robotics, greatly expanding 3D printing and aramid aerogels. Scope of application of glue.

Description

3D printing aramid aerogel, its preparation method and application technical field The present invention relates to a kind of 3D printing aerogel, especially relate to a kind of novel 3D printing aramid aerogel and preparation method thereof Methods and applications belong to the technical field of 3D printing and nanoporous materials. Background technique 3D printing technology refers to the production of highly customizable models directly from computer-aided design (CAD), using The separation technology decomposes the model into a multi-layer structure, and the material is stacked layer by layer into a solid product through a CNC forming system. its main package Including fused deposition modeling, inkjet printing technology, stereolithography, selective laser melting technology, direct writing technology, etc. That , direct-write molding technology is an extrusion-based 3D printing technology, that is, the layer-by-layer deposition of liquid ink materials. Dir...

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Problems solved by technology

[0003] CN105128127A reported the use of 3D printing technology to prepare graphene airgel. After adding the phenol-melamine-formaldehyde-furfural mixed system, the structural defects were greatly reduced, and due to the addition of collagen at the same time, the layer-to-layer relationship was improved. The binding force reduces the deformation phenomenon, but the printing ink contains a variety of additives, which affect the performance of graphene itself and limit its application

Aiming at the poor conductivity and mechanical properties of current graphene airgel products, CN107555422A reports a method for 3D printing graphene airgel based on large-size and high-concentration graphene oxide materials, but the normal temperature 3D printing process based on water system It will reduce the printing accuracy, which will limit the application of 3D graphene airgel

CN108046241A has reported a method for 3D printing ultra-porous elastic graphene airgel, but in the preparation process, ink pretreatment and material post-cleaning are required, and the preparation process is cumbersome

CN107936685A reports a preparation method of a polyimide ink that can be used for 3D printing by adding silicon dioxide to regulate the rheology of the ink, using sol-gel combined with 3D printing technology, but the addition of additives in the ink also limits the bulk material performance and application

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