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Production method and application of silicon dioxide-modified porous urea-resin-based carbon spheres

A technology of silica and urea-formaldehyde resin, used in carbon preparation/purification, hybrid capacitor electrodes, etc., can solve problems such as poor thermal stability and achieve stable structure, weakened melt fluidity, and good cycle performance.

Inactive Publication Date: 2019-06-07
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chen et al. used magnesium citrate as a template to prepare porous urea-formaldehyde resin, which showed good electrochemical performance, but still did not solve the problem of poor thermal stability (Xianying Chen, Chong Chen, Zhongjie Zhang, Donghua Xie, Xiao Deng, Nitrogen-doped porous carbon prepared from urea formaldehyde resins by template carbonization method for supercapacitors. Industrial & Engineering Chemistry Research, 2013, 52(30), 10181–10188)

Method used

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  • Production method and application of silicon dioxide-modified porous urea-resin-based carbon spheres
  • Production method and application of silicon dioxide-modified porous urea-resin-based carbon spheres
  • Production method and application of silicon dioxide-modified porous urea-resin-based carbon spheres

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Dissolve 6.0g of urea in 150.0mL of distilled water under stirring conditions, add 13.0g of formaldehyde and 5.0mL of formic acid in sequence, react for 15min and then let it stand for 24h, then filter and wash the obtained reaction solution until neutral, Dry at 60°C for 12h, then impregnate the product in 2.0mol / L HCl aqueous solution at room temperature and stir for 24h to solidify, the mixture is suction filtered again, washed until neutral, and dried at 60°C for 12h to obtain porous urea-formaldehyde resin microstructure ball;

[0031] (2) The porous urea-formaldehyde resin microspheres obtained in step (1) were carbonized at 800°C for 3 hours under the protection of argon, cooled to room temperature naturally, and black powder was obtained after grinding, that is, urea-formaldehyde resin-based carbon material.

[0032] The scanning electron micrograph of the porous urea-formaldehyde resin microsphere that present embodiment makes is as figure 1 shown by figu...

Embodiment 2

[0035] (1) Put 0.5g of silicon dioxide in 150.0mL of distilled water and ultrasonically treat it, so that the silicon dioxide is evenly dispersed in the aqueous solution;

[0036] (2) Dissolve 6.0g of urea in the mixed solution obtained in step (1) under stirring conditions, add 13.0g of formaldehyde and 5.0mL of formic acid in sequence, react for 15min and then let it stand for 24h, then filter the obtained reaction solution, Wash until neutral, dry at 70°C for 13h, then immerse the product in 2.0mol / L HCl aqueous solution at room temperature, stir and solidify for 24h, the mixed solution is filtered again, washed until neutral, and dry at 70°C for 13h, Obtain urea-formaldehyde resin microspheres containing porous silica;

[0037] (3) The porous urea-formaldehyde resin microspheres containing silica obtained in step (2) were carbonized at 800°C for 3 hours under the protection of argon, and cooled naturally to room temperature;

[0038] (4) Place the product obtained in step...

Embodiment 3

[0040](1) Put 1.0g of silicon dioxide in 150.0mL of distilled water and ultrasonically treat it, so that the silicon dioxide is evenly dispersed in the aqueous solution;

[0041] (2) Dissolve 6.0g of urea in the mixed solution obtained in step (1) under stirring conditions, add 13.0g of formaldehyde and 5.0mL of formic acid in sequence, react for 15min and then let it stand for 24h, then filter the obtained reaction solution with suction, Wash until neutral, dry at 70°C for 11h, then immerse the product in 2.0mol / L HCl aqueous solution at room temperature, stir and solidify for 24h, then filter the mixed solution again, wash to neutral, and dry at 70°C for 11h. Obtain porous urea-formaldehyde resin microspheres containing silicon dioxide;

[0042] (3) The porous urea-formaldehyde resin microspheres containing silica obtained in step (2) were carbonized at 800°C for 3 hours under the protection of argon, and cooled naturally to room temperature;

[0043] (4) Place the product ...

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Abstract

The invention relates to a production method of silicon dioxide-modified porous urea-resin-based carbon spheres and application of the silicon dioxide-modified porous urea-resin-based carbon spheres.The production method of the silicon dioxide-modified porous urea-resin-based carbon spheres comprises the following production steps of (1) conducting ultrasonic dispersion on silicon dioxide in distilled water; (2) adding urea, formaldehyde and formic acid into a mixed solution in sequence, standing a mixture for 24 h after mixing the mixture evenly, collecting a product, steeping the product inan HCl aqueous solution for curing, and obtaining porous urea resin microspheres containing carbon dioxide after washing and drying the product; and (3) conducting high-temperature carbonization on the product in argon, etching the product in a NaOH aqueous solution to remove the silicon dioxide, and obtaining the porous urea-resin-based carbon spheres. According to the production method of the silicon dioxide-modified porous urea-resin-based carbon spheres and the application of the silicon dioxide-modified porous urea-resin-based carbon spheres, the production process is simple, and has controllability, moreover, the silicon dioxide not only significantly improves the thermal stability of urea resin, but also adjusts a porous structure, and the silicon dioxide-modified porous urea-resin-based carbon spheres show excellent electrochemistry performance when used as an electrode material for a supercapacitor.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and also belongs to the technical field of new energy electronic materials, and specifically relates to a preparation method and application of silica-modified porous urea-formaldehyde resin-based carbon spheres. Background technique [0002] Urea-formaldehyde resin is a kind of amino resin, its raw material is cheap, the preparation process is simple, and it is widely used in various fields. Adjusting the molar ratio of urea and formaldehyde can control the surface morphology and internal porous structure of the resulting carbonaceous precursor. However, the porous urea-formaldehyde resin microspheres cannot maintain their original shape during high-temperature carbonization. Under high temperature conditions, the urea-formaldehyde resin becomes fluid due to the relative movement of the polymer chains, and serious melting occurs, which causes the microspheres to stick together, block the pores, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01G11/32H01G11/26
CPCY02E60/13
Inventor 李梅袁梦莹刘丽华
Owner QILU UNIV OF TECH
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