A method for preparing phenolic airgel by normal pressure drying method and prepared phenolic airgel

A technology of normal pressure drying and aerogel, which is applied in the field of phenolic airgel prepared by normal pressure drying method, and can solve the problem of complex preparation process of phenolic aerogel, poor performance of phenolic aerogel, phenolic gas Low gel strength and other issues, to achieve the effect of reducing cost and operation complexity, low cost and short cycle

Active Publication Date: 2020-01-24
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing phenolic aerogels by normal pressure drying method and the obtained phenolic aerogels, so as to solve at least the low strength of phenolic aerogels in the prior art and cause the difficulty of drying under normal pressure. Realize the problems of complex preparation process of phenolic aerogels prepared by atmospheric pressure drying method and poor performance of phenolic aerogels obtained by existing atmospheric pressure drying methods

Method used

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  • A method for preparing phenolic airgel by normal pressure drying method and prepared phenolic airgel
  • A method for preparing phenolic airgel by normal pressure drying method and prepared phenolic airgel
  • A method for preparing phenolic airgel by normal pressure drying method and prepared phenolic airgel

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Effect test

Embodiment 1

[0043] Resorcinol+formaldehyde phenolic precursor system is adopted, 3-chloropropyl trichlorosilane is used as modifier, the catalyst is 0.1mol / L hydrochloric acid solution, and the organic solvent is isopropanol; wherein the concentration of phenolic precursor is 10wt% , the molar ratio of phenolic precursor:modifier:catalyst is 50:5:1; the above raw materials are mixed and stirred evenly to obtain the precursor solution.

[0044] The precursor solution was placed in a sealed ampoule, then placed in a water bath at 60°C, and reacted (sol-gel reaction) for 96 hours to obtain a phenolic alcohol gel.

[0045] Take the phenolic alcohol gel out of the sealed ampoule, place it in the air at room temperature for 36 hours, and then dry it in an oven. The drying procedure in the oven is: first dry at 60°C under normal pressure for 24 hours, and then heat up Dry at 80°C under normal pressure for 24 hours, then raise the temperature to 120°C and dry at normal pressure for 24 hours, and ...

Embodiment 2

[0048] Resorcinol+formaldehyde phenolic precursor system is adopted, 3-chloropropyl trichlorosilane is used as modifier, the catalyst is 0.1mol / L hydrochloric acid solution, and the organic solvent is isopropanol; wherein the concentration of phenolic precursor is 10wt% , the molar ratio of phenolic precursor:modifier:catalyst is 100:10:1; the above raw materials are mixed and stirred evenly to obtain the precursor solution.

[0049] The precursor solution was placed in a sealed ampoule, then placed in a water bath at 80°C, and reacted for 48 hours to obtain a phenolic alcohol gel.

[0050] Take the phenolic alcohol gel out of the sealed ampoule, place it in the air at room temperature for 36 hours, and then dry it in an oven. The drying procedure in the oven is: first dry at 60°C under normal pressure for 24 hours, and then heat up Dry at 80°C under normal pressure for 24 hours, then raise the temperature to 120°C and dry at normal pressure for 24 hours, and finally raise the...

Embodiment 3

[0053] Resorcinol+formaldehyde phenolic precursor system is adopted, 3-chloropropyl trichlorosilane is used as a modifying agent, the catalyst is 0.1mol / L potassium hydroxide solution, and the organic solvent is isopropanol; wherein the concentration of the phenolic precursor is 15 wt%, the molar ratio of phenolic precursor:modifier:catalyst is 100:5:1; the above raw materials are mixed and stirred evenly to obtain a precursor solution.

[0054] The precursor solution was placed in a sealed ampoule, then placed in a 60°C water bath, and reacted for 72 hours to obtain a phenolic alcohol gel.

[0055] Take the phenolic alcohol gel out of the sealed ampoule, place it in the air at room temperature for 36 hours, and then dry it in an oven. The drying procedure in the oven is: first dry at 60°C under normal pressure for 24 hours, and then heat up Dry at 80°C under normal pressure for 24 hours, then raise the temperature to 120°C and dry at normal pressure for 24 hours, and finally ...

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Abstract

The invention relates to a method for preparing phenolic aerogel through an ambient pressure drying method and the prepared phenolic aerogel. The method includes the following steps that 1, a precursor solution which contains a phenolic precursor, a silane coupling agent, a catalyst and an organic solvent is prepared; 2, the precursor solution is subjected to sol-gel reaction to obtain phenolic gel; 3, the phenolic gel is subjected to room-temperature airing, and then ambient pressure drying is conducted at two or more different temperature stages to prepare the phenolic aerogel. According tothe method for preparing the phenolic aerogel, the cost is low, the cycle is short, and the technology is simple; the prepared phenolic aerogel has the advantages that the specific surface area is large, the pore diameter is small and the like; the comprehensive performance of the prepared phenolic aerogel is excellent.

Description

technical field [0001] The invention belongs to the technical field of airgel material preparation, and relates to a method for preparing airgel by an atmospheric drying method, in particular to a method for preparing phenolic airgel by an atmospheric drying method and the prepared phenolic airgel. Background technique [0002] Due to its high specific strength, specific surface area, and smaller and uniform pore size, airgel materials have better thermal insulation and noise reduction properties, and have become one of the research hotspots that have attracted the attention of research institutions around the world. Airgel materials are mainly divided into two categories: inorganic aerogels and organic aerogels. The main component of inorganic aerogels is silica. The use temperature of this type of aerogels does not exceed 700°C. When the temperature of the high-temperature components of a rocket engine reaches thousands of degrees or even higher, the inorganic airgel will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J3/075C08L61/14C08G8/28
CPCC08G8/28C08J3/075C08J9/28C08J2201/0502C08J2361/14
Inventor 郭慧李文静刘圆圆赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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