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Method for preparing zirconia aerogel by secondary gel method combined with atmospheric drying

An atmospheric drying and aerogel technology, applied in zirconia and other directions, can solve the problems of expensive equipment, difficult mass production, and high cost, and achieve the effect of improving the strength of the skeleton

Active Publication Date: 2017-03-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of high cost, expensive equipment and difficult realization of large-scale production in the existing supercritical drying method, and provides a method for preparing zirconia airgel by combining the secondary gel method with normal pressure drying

Method used

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  • Method for preparing zirconia aerogel by secondary gel method combined with atmospheric drying
  • Method for preparing zirconia aerogel by secondary gel method combined with atmospheric drying
  • Method for preparing zirconia aerogel by secondary gel method combined with atmospheric drying

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specific Embodiment approach 1

[0025] Specific embodiment one: In this embodiment, the method for preparing zirconia airgel by secondary gel method combined with normal pressure drying is carried out according to the following steps:

[0026] 1. Preparation of zirconia wet gel

[0027] Under stirring conditions, the ZrO(NO 3 ) 2 2H 2 Dissolve O in an alcoholic water solvent to make a transparent solution with a zirconyl nitrate concentration of 4.9-5.1wt%, then add formamide dropwise to the solution to obtain a mixed solution, and put the mixed solution in a water bath at a temperature of 60°C In a water bath, add ammonia water drop by drop to adjust the pH of the mixture to 8.7-9.3, then increase the stirring rate, stop stirring after 5-8 minutes, the gel is in a thick soup state, and continue to bathe at 60°C;

[0028] 2. ZrO 2 Regelation and Modification of Thick Gel

[0029] Transfer the thick soup-like gel prepared in step 1 to an oven at 43-47°C for aging until a wet gel solid is formed for the s...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, a transparent solution with a zirconyl nitrate concentration of 5 wt % is prepared. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the alcohol-water solvent in step 1 is made of absolute ethanol and water at a volume ratio of 2.8 to 3.2:1. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for preparing zirconium oxide aerogel through combination of a secondary gelling method and ambient-pressure drying and relates to a preparation method of the zirconium oxide aerogel. The problems that an existing super-critical drying method is high in cost, equipment is expensive, and large-scale production can not be easily achieved are solved. The method includes the steps of 1, preparation of zirconium oxide wet gel; 2, re-gelling and modification of ZrO2 thick-soup-shaped gel; 3, drying of the ZrO2 aerogel. The secondary gelling method is adopted, the stirring speed is controlled, two gelling processes are generated to a system, the frame strength of the aerogel is improved to avoid the influences of capillary force in the following ambient-pressure drying process on the material pore structure, and it is guaranteed that the pore structure of the aerogel is not collapsed. According to the method, ambient-pressure drying is adopted, the problems of high energy consumption and cost existing in the process of preparing zirconium oxide aerogel through super-critical drying are solved, and large-scale production can be easily achieved. The method is used for preparing the zirconium oxide aerogel.

Description

technical field [0001] The invention relates to a preparation method of zirconia airgel. Background technique [0002] With the development of science and technology in today's world, people's demand for energy is increasing day by day. One of the effective ways to save energy is heat insulation and energy-saving technology, which means saving fuel and increasing heat utilization. The research, development and application of lightweight and high-efficiency thermal insulation materials are of great significance to the fields of national defense, aerospace, military, and agricultural industries. [0003] Aerogels are a kind of lightweight porous condensed matter with air as the medium, which has a unique three-dimensional network structure. The particle phase and pore size are both on the nanometer scale, so that its nanoscale microstructure is well controlled, and has many unique properties and performances, such as small average pore size, large specific surface area, low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/02
Inventor 李文旭宋英黄国梁王铎梁晨
Owner HARBIN INST OF TECH
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