Preparation method of phenolic resin aerogel

A technology of phenolic resin and airgel, which is applied in the preparation/purification of carbon, chemical instruments and methods, and other chemical processes. It can solve the problems of complex synthesis, limited application, and high cost of ionic liquids, and achieves wide sources and easy storage. , the effect of expanding the scope of application

Active Publication Date: 2014-04-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method not only has the above problems, but also requires complex synthesis and higher cost of ionic liquid, which greatly limits its application.

Method used

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  • Preparation method of phenolic resin aerogel
  • Preparation method of phenolic resin aerogel
  • Preparation method of phenolic resin aerogel

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preparation example Construction

[0061] The invention discloses a preparation method of phenolic resin gel, comprising:

[0062] a1, disperse chitosan in water or water / dehydrated ethanol mixed solution, add acid again, stir to obtain chitosan sol;

[0063] Or add filler and chitosan to water or water / dehydrated ethanol mixed solution, stir well and then add acid, stir to obtain chitosan sol;

[0064] b1, add phenols in chitosan sol, after stirring evenly, then add aldehydes, stir again to obtain mixed sol;

[0065] c1, put the mixed sol into a hydrothermal kettle, place it in an oven for hydrothermal reaction, and obtain a phenolic resin organogel;

[0066] d1. Soak the phenolic resin organogel in an organic solvent to replace until the organic solvent changes color, replace the organic solvent until the organic solvent after soaking the phenolic resin organogel is colorless, take out the phenolic resin organogel and perform supercritical drying to obtain the phenolic resin Aerogel;

[0067] Or place the ...

Embodiment 1

[0087] The present embodiment phenolic resin airgel is carried out as follows:

[0088] a. In a beaker with a volume of 100mL, disperse 0.45g of chitosan (Shanghai Sinopharm Group) in 30ml of deionized water, add 0.6ml of acetic acid, and stir to obtain a colorless and transparent chitosan sol;

[0089]b. Put phenol in an oven at 60°C until it melts, weigh 9.411g of liquid phenol and add it to the above-mentioned colorless and transparent chitosan sol, stir fully and quickly to make it evenly mixed into a white emulsion, and then quickly add 3ml For formaldehyde solution, keep fast and uninterrupted stirring evenly until its viscosity increases significantly to obtain a mixed sol;

[0090] c. Put the mixed sol into a 50ml hydrothermal kettle, place it in an oven at 160°C, and conduct a hydrothermal reaction for 10 hours to obtain a phenolic resin organogel, which is called organogel 1;

[0091] d, immerse the phenolic resin organogel in acetone for three days, replace new ace...

Embodiment 2

[0094] Utilize the preparation method identical with embodiment 1, adopt 0.45g chitosan, in described step b, the amount of the phenol that adds is 1.882g, 3.764g, 5.647g, 6.588g, 7.529g, 11.29g and 13.175g , the added formaldehyde is 3ml, that is, the ratio of the amount of phenol to formaldehyde (P / F) is 0.5, 1, 1.5, 1.75, 2, 3 and 3.5, respectively, after hydrothermal reaction, different P / F can be obtained Resin organogels, numbered organogel 2 to organogel 8; supercritical CO 2 The airgel obtained after drying and the carbon aerogel obtained after carbonization are respectively numbered as airgel 2 to airgel 8, and carbon aerogel 2 to carbon aerogel 8, respectively.

[0095] Because the amount of chitosan used in the reaction is unchanged, the microscopic skeleton structure is the same. The difference in the ratio of phenol to formaldehyde changes the amount of linear small molecules or oligomers filled in the skeleton, thereby changing the phenolic resin. Mechanical pro...

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Abstract

The invention discloses a preparation method of phenolic resin aerogel. The preparation method is characterized in that chitosan, one or more acid, one or more filling materials, one or more phenols, one or more aldehydes, and water or a water-anhydrous ethanol mixture are mixed; the mixture undergoes a hydrothermal reaction to produce phenolic resin organogel; the phenolic resin organogel is immersed in an organic solvent for replacement; and the replacement product is subjected to supercritical CO2 drying so that the phenolic resin aerogel is obtained. The preparation method has simple processes and safe and reliable reactions and realizes adjustment of a structure and mechanical properties of the phenolic resin organogel. The structure and density of the phenolic resin aerogel obtained by drying and porosity and a specific surface area of the derivative porous carbon material obtained by carbonization of the phenolic resin aerogel are adjusted and controlled well.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and more specifically relates to a preparation method of phenolic resin gel. Background technique [0002] As one of the three major synthetic resins, phenolic resin has experienced more than 100 years of development history, and has been widely used in various fields such as national defense and military industry, construction, transportation, chemical industry and energy. At present, phenolic resin has attracted people's interest as a carbon source to prepare various nanostructured porous carbon materials. Porous carbon materials have attracted extensive attention due to their high specific surface area, controllable micro / nano pore size, and excellent electrical conductivity, and are widely used in various fields, such as adsorption, filtration separation, photonic crystals, catalyst supports, electrochemical capacitors, lithium There are potential applications in ion batteries, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/10C08J3/075C08L61/10C08L5/08C08K3/34C01B31/02B01J20/291B01J20/30C01B32/05
Inventor 俞书宏于志龙
Owner UNIV OF SCI & TECH OF CHINA
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