Preparing method of graphene aerogel/polyurethane foam conductive composite

A conductive composite material, graphene aerogel technology, applied in the direction of graphene, chemical instruments and methods, ceramic products, etc., can solve the problems of poor mechanical properties of aerogels, high production costs, and difficulty in meeting application requirements.

Inactive Publication Date: 2019-04-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, the problems existing in the existing technology are: the existing graphene / chitosan conductive airgel materials need to be processed at high temperature, and the production cost is high; the mechanical properties of the airgel itself are poor, and it is difficult to meet the application requirements

Method used

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  • Preparing method of graphene aerogel/polyurethane foam conductive composite
  • Preparing method of graphene aerogel/polyurethane foam conductive composite
  • Preparing method of graphene aerogel/polyurethane foam conductive composite

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preparation example Construction

[0036] The invention provides a method for preparing a graphene aerogel / polyurethane foam conductive composite material, which includes the following steps:

[0037] Step S1: preparing graphene oxide dispersion: adding graphene oxide prepared by the improved Hummer’s method to deionized water, ultrasonicating for 30 minutes, to prepare a uniform dispersion of graphene oxide with a concentration of 1-10 wt.%;

[0038] Step S2: Preparation of chitosan solution: pour the solid chitosan powder into the acetic acid solution with a volume fraction of 1 vol.%, and mechanically stir at 500-1000 rpm until it is completely dissolved, and then the obtained chitosan The solution is centrifuged at 500-1000 rpm for 2-10 minutes to remove insoluble solid impurities and prepare a chitosan solution with a concentration of 1-20wt.%;

[0039] Step S3: Preparation of graphene oxide / chitosan solution: the graphene oxide dispersion obtained in step 1 and the chitosan solution prepared in step 2 are adjust...

Embodiment 1

[0047] Step 1, preparing graphene oxide dispersion: adding 1 g of graphene oxide prepared by the improved Hummer’s method to 10 mL of deionized water, and ultrasonically dispersing for 30 minutes until uniformly dispersed, to obtain a graphene oxide dispersion with a concentration of 10 wt.%;

[0048] Step two, prepare the chitosan solution: pour 25g of medium molecular weight chitosan powder into 250mL of 1vol.% acetic acid solution, mechanically stir at 800 rpm for 12 hours until completely dissolved, and then 500 rpm Centrifugal separation at a speed of 10 minutes per minute to remove insoluble impurities and obtain a chitosan solution with a concentration of 10 wt.%;

[0049] Step three: prepare graphene / chitosan solution: mix the graphene oxide dispersion obtained in step one with the chitosan solution prepared in step two at a mass ratio of 1:1, and continue to mechanically stir for 60 minutes until mixed under ultrasound Evenly

[0050] Step 4: Filling the open-cell polyureth...

Embodiment 2

[0058] Step 1: Prepare graphene oxide dispersion: add 0.5 g of graphene oxide prepared by the improved Hummer's method to 10 mL of deionized water, and ultrasonically disperse for 30 minutes until uniformly dispersed, to obtain a graphene oxide dispersion with a concentration of 5 wt.% ;

[0059] Step two: preparing chitosan solution: pour 25 g of medium molecular weight chitosan powder into 250 mL of 1 vol.% acetic acid solution, and mechanically stir at 800 rpm for 12 hours to completely dissolve. Then centrifuge at a speed of 500 rpm for 10 minutes to remove insoluble impurities and obtain a chitosan solution with a concentration of 10 wt.%;

[0060] Step three: prepare graphene / chitosan solution: mix the graphene oxide dispersion obtained in step one with the chitosan solution prepared in step two at a mass ratio of 1:1, and continue to mechanically stir for 60 minutes until mixed under ultrasound Evenly

[0061] Step 4: Filling the open-cell polyurethane foam with graphene oxi...

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Abstract

The invention belongs to the field of intelligent materials, and discloses a preparing method of a graphene aerogel/polyurethane foam conductive composite. The method includes the following steps of preparing and then mixing graphene oxide dispersing liquid and a chitosan solution, filling hole foam with a mixed solution in a vacuum state, and preparing the finished graphene aerogel/polyurethane hole foam composite product through the measures of freezing treatment, freeze-drying and thermal treatment. The method has the advantages that by introducing high-conductivity high-piezoresistance-sensitivity graphene/chitosan aerogel into the polyurethane hole foam with excellent mechanical property, the excellent conductivity and piezoresistance of the graphene/chitosan aerogel are realized, meanwhile it is ensured that the composite has the excellent mechanical property, the problem that application is limited due to the poor mechanical strength of the aerogel is solved, and the prepared composite has conductivity, high piezoresistance sensitivity, high compression resilience, high durability and the like.

Description

Technical field [0001] The invention belongs to the field of smart materials, and particularly relates to a preparation method of a graphene aerogel / polyurethane foam conductive composite material. Background technique [0002] Graphene is a one-dimensional crystal composed of carbon atoms with a thickness of only one layer of atoms, because of its excellent mechanical, electrical, optical and other properties. Graphene prepared by the redox method has the characteristics of low production cost, easy chemical modification, and strong dispersibility. The graphite oxide aqueous solution and the hydrophilic polymer are mixed to obtain a graphene oxide / polymer mixed solution, and then graphene-based aerogels can be prepared by freeze-drying. Chitosan is the product of de-N-acetylation of chitin. Chitosan molecular chain is rich in amino groups (-NH 2 ), the amino group can form hydrogen bonds with the hydroxyl group (-OH) and carboxyl group (-COOH) on the surface of the graphene ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/16C04B38/10C01B32/184
CPCC01B2204/22C04B26/16C04B2111/40C04B2111/94C01B32/184C04B24/12C04B14/024C04B38/106
Inventor 夏和生翟天亮马里罗.拉瓦叶纳乔凡娜.博诺科雷
Owner SICHUAN UNIV
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