Method for preparing hyperelastic silicon oxide nano ceramic aerogel based on graphene as template

A technology of graphene airgel and nano-ceramics, which is applied in ceramic products, applications, household appliances, etc., can solve the problem of affecting the thermal insulation performance of silica airgel, silica airgel is brittle and fragile, and is difficult to industrialize Application and other issues, to achieve excellent thermal properties and mechanical properties, improve economic and social benefits, and shorten the synthesis cycle

Inactive Publication Date: 2021-05-14
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional silica airgel prepared by this method has high preparation cost, long cycle, and high energy consumption, and the finished silica airgel has problems such as brittleness, low elasticity, and disordered pore structure, which seriously affects The thermal insulation performance of silica aerogels has been compromised, and it is difficult to realize industrial applications

Method used

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  • Method for preparing hyperelastic silicon oxide nano ceramic aerogel based on graphene as template
  • Method for preparing hyperelastic silicon oxide nano ceramic aerogel based on graphene as template
  • Method for preparing hyperelastic silicon oxide nano ceramic aerogel based on graphene as template

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Experimental program
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Effect test

Embodiment 1

[0030]A method of preparing an ultra-elastic silica nanopharacemic gas gel based on graphene is, including the steps of:

[0031]Step 1: Preparation of 3D graphene gel template

[0032](1), the concentration is 1 mg / ml of large-piece oxahydrophene raw material, after ultrasonic treatment to good fluidity, add 5 ‰ ethylenediamine, and again ultrasound to good fluidity;

[0033](2), the treatment of oxide oxide raw materials is added to the mold preparative, and the molded mold is placed in the reactor, and the reaction kettle is placed in a vacuum drying tank, and the corresponding graphite is obtained after the water is hot. Allene gel;

[0034](3), the obtained graphene hydrogel is placed in a 20vol.% Ethanol solution of 24 to 48 h, and finally the hydrogel is freeze and remove the solution to obtain a regular porous gas gel, and annealed at 950 to 1000 ° C. 30min to get a three-dimensional graphene gel;

[0035]Step 2: Preparation of the silicone source

[0036](1), according to the volume ratio ...

Embodiment 2

[0047]A method of preparing an ultra-elastic silica nanopharacemic gas gel based on graphene is, including the steps of:

[0048]Step 1: Preparation of 3D graphene gel template

[0049](1), the concentration of 5 mg / ml of large-piece oxahydrophene raw material, after ultrasonic treatment to good fluidity, add 5 ‰ ethylenediamine, and ultrasound to good fluidity;

[0050](2), the treatment of oxide oxide raw materials is added to the mold preparative, and the molded mold is placed in the reactor, and the reaction kettle is placed in a vacuum drying tank, and the corresponding graphite is obtained after the water is hot. Allene gel;

[0051](3) The resulting graphene hydrogel is placed in a 20vol.%. The ethanol solution is soakeded 24 to 48 h, and finally the hydrogel is freeze and remove the solution to obtain a regular porous gas gel, and 950 ~ 1000 ° C is annealed for 30 min. To get a three-dimensional graphene gel;

[0052]Step 2: Preparation of the silicone source

[0053](1), according to volum...

Embodiment 3

[0064]A method of preparing an ultra-elastic silica nanopharacemic gas gel based on graphene is, including the steps of:

[0065]Step 1: Preparation of 3D graphene gel template

[0066](1), the concentration of a large-sheet oxide oxide raw material having a concentration of 10 mg / ml is obtained by ultrasonic treatment to a good fluidity, and 5 ‰ ethylenediamine is added, and it is again ultrasound to the fluidity;

[0067](2), the treatment of oxide oxide raw materials is added to the mold preparative, and the molded mold is placed in the reactor, and the reaction kettle is placed in a vacuum drying tank, and the corresponding graphite is obtained after the water is hot. Allene gel;

[0068](3) The obtained graphene hydrogel was submerged in a 20vol.% Ethanol solution of 24 to 48 h, and finally the hydrogel was freeze and dried to remove the solution to obtain a regular porous gas gel, and 950 to 1000 ° C for 30 min. Get a three-dimensional graphene gel;

[0069]Step 2: Preparation of the silic...

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Abstract

The invention relates to the technical field of ceramic preparation, in particular to a method for preparing hyperelastic silicon oxide nano ceramic aerogel based on graphene as a template. The preparation method comprises the following steps: firstly, carrying out hydrothermal treatment, freeze drying and thermal annealing treatment on a graphene oxide solution with a certain concentration to prepare porous graphene aerogel; then, depositing organic silicon sources with different concentrations on the graphene aerogel through vapor deposition, completely attaching organic silicon to the surfaces of inner and outer graphene sheet layers through a vacuum auxiliary means, and forming a framework and organic silicon two-phase body; then heating and curing to form an interlayer bracket composite aerogel; and finally, heating the aerogel composite material in an air or oxygen flowing atmosphere to obtain the superelastic silicon oxide nano ceramic aerogel. The preparation method has the beneficial effects that the superelastic silicon oxide nano ceramic aerogel prepared by taking the graphene aerogel as a template has the characteristics of flexibility, light weight, high purity and superelasticity; and the method has the advantages of simple preparation process, low cost, easy control of preparation conditions, short synthesis period, low energy consumption and the like.

Description

Technical field[0001]The present invention relates to the field of ceramic preparation, in particular a method of preparing an ultra-elastic silica nanophalamic airgel based on graphene.Background technique[0002]Conventional silicon oxide gas gel preparation method is a sol-gel method, specifically a silicon source (sodium silicate, TEOS, polysilicon, silica sol, etc.) catalyzed hydrolysis, condensed to form a solicity containing primary and secondary particles, two The particles can further form a chain particle cluster, which is a silicone gel. Subsequently, silicon gel is dried in a supercritical or normal pressure, freezing, etc., and the silicon oxide gas gel is prepared. Oxidized silica gel has the advantages of high porosity, low density, high temperature resistance, etc., has a wide range of applications in many areas such as infrastructure, energy, electronics, aerospace, and air, especially in the insulation insulation and high temperature resistance. Such as air insulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/622C04B38/06
CPCC04B35/14C04B35/622C04B38/0615C04B2235/425C04B2235/483C04B2235/656C04B2235/6567C04B2235/6583C04B2235/6585C04B2235/77C04B2235/9653C04B38/0067
Inventor 张强强何鹏张宝强张兴义
Owner LANZHOU UNIVERSITY
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