Hyperelastic guar gum carbon aerogel as well as preparation method and application thereof

A technology of guar gum carbon and carbon airgel, which is applied in the direction of airgel preparation, carbon preparation/purification, chemical instruments and methods, etc., can solve the problem that composite phase change materials are difficult to maintain shape stability, and achieve excellent thermal stability. The effects of cycle performance, high load capacity, and excellent heat storage performance

Pending Publication Date: 2022-03-01
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can effectively encapsulate phase change materials, but the applicant found in follow-up experiments that since the obtained carbon aerogels are hard and bri

Method used

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  • Hyperelastic guar gum carbon aerogel as well as preparation method and application thereof
  • Hyperelastic guar gum carbon aerogel as well as preparation method and application thereof
  • Hyperelastic guar gum carbon aerogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation method of super elastic guar rubber carbon gas gel, including the following steps:

[0051] Step 1) Preparation of Guar Adhesive gels, 1 g of melamp powder added to a beaker of 100 ml of deionized aqueous solution, and the mechanical stirring 10 h is allowed to completely dissolve hydration, then, add 1 g of hydrogen phosphate, continued for the second stirring for 40 min, and the stirred defoaming was stored after stirring, and the frozen gel chip column was frozen in the refrigerator of -16 ° C, and then placed in the crystal dryer Dry 72H, can be obtained by melum / phosphate diommonium hydrogel;

[0052] Step 2) Preparation of super-elastic guar rubber carbon gas gel, first place step 1 to be placed in a blast drying tank for two-step heat treatment, the first step heat treatment is processed at 120 ° C for 6 h The second step heat treatment is, increase the temperature to 180 ° C, continuous treatment for 6 h, after the two step heat treatment is completed,...

Embodiment 2

[0067] This embodiment provides a method of preparing a super elastic guar rubber carbon gas gel. The steps not specifically described are the same as in Example 1. Different in: The mass of dismine ammonium hydrogen phosphate is 0.5 g, The resulting sample was named SCA-0.5.

[0068] In order to demonstrate the addition of phosphate ammonium hydrogen phosphate to the microstructure of super-elastic guar rubber gas gel, SCA-0.5 is carried out, and the results are figure 1 As shown, SCA-0.5 has a complete cross-linking three-dimensional network structure, but in conjunction with SCA-1 in Example 1, the aperture structure is too much disadvantageous to attach to-in-cell phase change medium, mainly because of the addition of phosphate. At small, its hydrogen bonding between the GG molecules is weak such that the arrangement between the GG molecular chains is not compact, and thus the prepared carbon gas gel structure is loose, and the aperture structure is too large.

[0069] In orde...

Embodiment 3

[0071] This embodiment provides a method of preparing a super elastic guar rubber carbon gas gel, and the step of not particularly explained is the same as in Example 1, and the mass of the addition of phosphate in the step 1 is 1.5 g, The resulting sample is named SCA-1.5.

[0072] In order to demonstrate the amount of phosphate amonium hydrogen phosphate to the microstructure of super-elastic guar rubber gas gel, SCA-1.5 has been subjected to SCA-1.5. figure 1 As shown, some aggregation phenomena in the SCA-1.5 carbon gas gel structure compared to in Example 1, and the hole structure also exhibits a slight contraction collapse.

[0073] In order to demonstrate the addition of phosphate anexide to the crystallization properties of super-elastic guar rubber gas gel, XRD testing is performed on SCA-1.5. figure 2 As shown, the XRD map shows a pattern similar to the SCA-1 in Example 1, but the half peak width is wider, since the increase in the amount of the hydrogen phosphate added ...

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Abstract

The invention discloses hyperelastic guar gum carbon aerogel which is prepared by taking polysaccharide guar gum as a raw material and diammonium hydrogen phosphate as a catalyst through two-step heat treatment and low-temperature carbonization, the super-elasticity, the super-light property and the high compressibility are achieved, and 95% deformation is generated under the stress of 0.055 MPa; the density is only 0.458 g/cm < 3 >; and cyclic compression can be as high as 50000 times under the compression strain of 50%. The preparation method comprises the following steps: 1) preparing guar gum aerogel; and 2) preparing the hyperelastic guar gum carbon aerogel. When being used as a phase change material, the material can keep stable shape after being subjected to external force in a high-temperature environment; the phase change temperature is 30-58 DEG C, and the phase change latent heat is 138-179 J/g. The method has the following advantages: under the catalytic action of diammonium hydrogen phosphate, guar gum is pyrolyzed and dehydrated at low temperature, so that the coke yield is increased, and the volume shrinkage of a carbon material is reduced; the shape stability and high thermal cycling stability of the composite phase change material are realized, and the composite phase change material has a wide application prospect in the field of phase change heat storage.

Description

Technical field [0001] The present invention relates to the field of carbon gas gel and phase change energy storage material, and more particularly to a super elastic guar rubber carbon gas gel and a preparation method thereof. Background technique [0002] At present, the sustainable development of modern society is facing excessive energy consumption, and the environmental burden is serious. Therefore, developing efficient, sustainable, green energy and environmentally friendly energy storage materials have become an inevitable choice for human society to address serious energy and environmental issues. Energy storage technology can save energy, improve energy utilization efficiency, and develop high performance energy storage materials has become one of the most effective strategies in energy conservation and environmental protection. [0003] The phase change energy storage material is an important implementation material in energy storage technology, providing a carrier for ...

Claims

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Application Information

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IPC IPC(8): C01B32/05C09K5/06B01J13/00
CPCC01B32/05C09K5/063B01J13/0091C01P2002/72C01P2004/03C01P2002/88Y02E60/14
Inventor 张焕芝荆锐张青峰吴博竞孙宗旭魏胜夏永鹏温鑫孙立贤徐芬
Owner GUILIN UNIV OF ELECTRONIC TECH
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