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A kind of porous aerogel and preparation method thereof

A porous airgel and uniform technology, applied in the direction of insulation improvement, etc., can solve the problems of expensive equipment, low output, long time consumption, etc., and achieve the effect of simple equipment, simple preparation process and fast preparation

Active Publication Date: 2022-05-20
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method does not cause shrinkage deformation and collapse of the structure, it takes a long time, has low output, high price and expensive equipment

Method used

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  • A kind of porous aerogel and preparation method thereof
  • A kind of porous aerogel and preparation method thereof
  • A kind of porous aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a method for preparing porous aerogels by using ice crystals instead. The process flow is as follows figure 1 shown, including the following steps:

[0033] Add 1g of polyacrylonitrile (Mw=15W) into 9g of dimethyl sulfoxide solution, heat and stir at 80°C for 8h to dissolve completely; then pour the polymer solution into a 1cm-thick polytetrafluoroethylene mold, place Freeze at -70°C for 4 hours, then soak in pre-cooled aqueous solution for 4 hours, and keep the temperature between 0-14°C, finally take it out, heat it at 80°C for 2 hours, and dry it completely. Porous airgel.

[0034] figure 2 It is the macroscopic topography figure of the porous airgel of embodiment 1, by figure 2 It can be seen that the obtained porous airgel has better shape retention.

[0035] image 3 In order to replace the polymers of Example 1 with different polymers, the airgel obtained has a rich pore structure (such as image 3 As shown, the pore size is about...

Embodiment 2

[0038] This embodiment provides a method for preparing porous airgel by using ice crystals instead. Its specific process is basically the same as that in Example 1, except that 1g of polyvinyl alcohol (Mw=30W) and 0.5g of silicon dioxide Add nanoparticles into 9g aqueous solution, stir at 90°C for 8h to dissolve / disperse completely; then pour the polymer solution into a 1cm-thick polytetrafluoroethylene mold, freeze at -70°C for 4h, and put Soak in the pre-cooled acetone solution for 4 hours, and keep the temperature between -20-0°C, finally take it out, heat it at 40°C for 2 hours, and dry it completely, then the porous airgel can be prepared. The prepared porous airgel has an average pore diameter of about 1.2-5.7 microns, a thermal conductivity of 0.018-0.025 W / K (25° C.), a compressive strength of 27 MPa and a compressibility of 92%.

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Abstract

The invention provides a porous airgel and a preparation method thereof. The preparation method comprises: dissolving the polymer in a good solvent to obtain a homogeneous solution, and freezing the homogeneous solution; soaking the frozen product in a poor solvent at a temperature between the melting point of the good solvent and the melting point of the poor solvent ; The soaked product is heated and dried to obtain a porous airgel. The porous airgel prepared by the above preparation method of the present invention has excellent mechanical properties and thermal insulation properties.

Description

technical field [0001] The invention relates to a method for preparing porous airgel, which belongs to the technical field of airgel material preparation. Background technique [0002] With the rapid development of thermal insulation and cushioning materials, the demand for lightweight porous materials is increasing. Aerogels exhibit excellent thermal insulation properties due to their rich pore structure, polar thermal conductivity, and extremely small density. Traditional aerogels are usually inorganic aerogels, which have problems such as poor mechanical properties, brittle texture, and difficult processing. The emerging organic aerogels not only have the rich pore structure and excellent thermodynamic properties of inorganic aerogels, but also have good mechanical properties, good thermal insulation performance, and strong impact resistance. [0003] At present, the main methods for preparing organic aerogels include freeze-drying and supercritical drying. Freeze-dryi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08L33/20C08L29/04
CPCC08J9/28C08J2333/20C08J2329/04C08J2201/0482C08J2201/0484C08J2205/026C08J2205/044C08J2201/0544C08J2201/0546Y02B80/10
Inventor 严锋任勇源
Owner SUZHOU UNIV