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3D printing polyimide aerogel and preparation method thereof

A technology for printing polyimide and 3D printing, which can be used in processing and manufacturing, liquid material additive processing, additive processing, etc., and can solve the problems of environmental pollution, long time, and impure polyimide aerogel. To achieve the effect of simple synthesis process and simple operation

Active Publication Date: 2020-06-05
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention has the following defects: first, because the silica airgel powder itself presents brittleness, it is used as a rheology modifier to blend with polyamic acid, and the polyimide airgel finally obtained is impure non-homogeneous airgel, and will greatly affect the mechanical properties of polyimide airgel
Second, the chemical imidization used in this invention requires the use of toxic substances such as acetic anhydride and pyridine, which are likely to cause environmental pollution
Third, the supercritical drying used in this invention often requires a solvent exchange step, which takes a long time and requires huge equipment and high costs

Method used

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  • 3D printing polyimide aerogel and preparation method thereof
  • 3D printing polyimide aerogel and preparation method thereof
  • 3D printing polyimide aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Using N,N-dimethylacetamide as a solvent, add 4,4'-diaminodiphenyl ether and pyromellitic anhydride in an ice-water bath for condensation polymerization in an equimolar ratio to prepare a solid content 15% polyamic acid. The specific process is as follows: Dissolve 8.0096g of 4,4'-diaminodiphenyl ether in 95.57g of N,N-dimethylacetamide, add 8.86g of pyromellitic anhydride, and react in an ice-water bath for 5h. Then, 4.0476 g of triethylamine was added, and the reaction was continued for 3 hours to prepare a water-soluble polyamic acid solution with a solid content of 15%. The prepared water-soluble polyamic acid is precipitated with deionized water, and then washed and freeze-dried to obtain a dry silk of the water-soluble polyamic acid for use.

[0043] (2) Dissolve 1 g of polyamic acid dry silk in 12.5 mL of deionized water, add 0.5 g of triethylamine, put it on a magnet and stir on a stirring table for 12 hours to obtain a polyamic acid sol with a solid conten...

Embodiment 2

[0047] Change the amount of deionized water in Example 1 to 16.6mL to prepare a polyamic acid solution with a solid content of 6%. The freeze-solidified polyamic acid with a three-dimensional framework structure obtained through cold plate-assisted 3D printing is denoted as PAA-6. The obtained polyimide airgel with a three-dimensional framework structure is designated as PI-6, and the rest are the same as in Example 1.

Embodiment 3

[0049] Change the amount of deionized water in Example 1 to 10mL to prepare a polyamic acid solution with a solid content of 10%. The freeze-solidified polyamic acid with a three-dimensional framework structure obtained by cold plate-assisted 3D printing is denoted as PAA -10. The obtained polyimide airgel with a three-dimensional framework structure is designated as PI-10, and the rest are the same as in Example 1.

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Abstract

The invention relates to a 3D printing polyimide aerogel and a preparation method thereof. The polyimide aerogel is obtained by printing a polyamide acid solution into a set structure through a 3D printer, assisting a cold plate to freeze, solidify and mold, and then performing deep freezing, freeze drying and thermal imidization. According to the preparation method, a 3D structure is accurately and effectively constructed through a 3D printing technology, a polyamic acid solution can well keep the 3D printing structure through cold plate assisted molding, then the polyimide aerogel with a specific structure is obtained, the synthesis process is simple, environmentally friendly and easy to operate, and the preparation method is a green preparation method.

Description

technical field [0001] The invention belongs to the field of airgel materials and preparation thereof, in particular to a 3D printing polyimide airgel and a preparation method thereof. Background technique [0002] 3D printing technology is a new type of moldless molding technology. With the help of computer-aided design and precision machinery, this technology prepares simple three-dimensional periodic structures and complex three-dimensional structures with spans (unsupported) or with large aspect ratios by layer-by-layer stacking. At present, 3D printing technology based on extrusion molding principle has attracted extensive research in the manufacture of advanced materials due to its low cost, large scale, high efficiency, programmable geometric characteristics and designable fine structure. However, the fused deposition modeling technology (FDM) has high requirements for printing materials, which are generally thermosetting plastics or resins, and the feeding method is...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L79/08B29C64/106B33Y10/00B33Y30/00B33Y70/00B33Y80/00
CPCB33Y10/00B33Y30/00B33Y70/00B33Y80/00B29C64/106C08J9/286C08J2201/0484C08J2205/026C08J2207/04C08J2379/08
Inventor 樊玮元诗佳刘天西王栋
Owner DONGHUA UNIV
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