Graphene oxide modified cellulose-based phase change microcapsule and preparation method thereof

A technology of graphene modification and cellulose, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., to achieve the effect of high coating rate, uniform shape and favorable heat storage

Inactive Publication Date: 2021-03-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene oxide has the characteristics of excellent thermal conductivity, good chemical stability, non-toxic and harmless, so using graphene oxide to modify cellulose to prepare phase-change microcapsules can not only effectively improve the phase-change microcaps

Method used

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  • Graphene oxide modified cellulose-based phase change microcapsule and preparation method thereof
  • Graphene oxide modified cellulose-based phase change microcapsule and preparation method thereof
  • Graphene oxide modified cellulose-based phase change microcapsule and preparation method thereof

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Experimental program
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Example Embodiment

[0031] According to a preparation method of the oxide phase-modified cellulose-based phase change microcapsule of the present invention, it is formulated according to the amount of the raw material, and specifically includes the following steps:

[0032] (1) The aqueous solution of the emulsifier is disposed, and distilled water is added to sodium sulfate, Tween-20 and the defoamer, and finally at 60 ° C for 20 minutes, the stirring speed is 600 ~ 800 rpm, and the aqueous solution of the emulsifier is obtained. .

[0033] (2) Configuring palmitic acid and ethylcellulose acetate solution, palmitic acid and ethyl cellulose in the container, then ethyl acetate, stirred at 65 ° C to completely dissolve the palmitic acid and ethylcellulose.

[0034] (3) under stirring at 60 ~ 70 ℃, the ethyl acetate solution from step (2) was added in step (1), 600 ~ 1000rpm mixed 4 to 6 hours, when complete evaporation of ethyl acetate, then Cooled to room temperature, then add oxide oxide, thoroughly...

Example Embodiment

[0036] Example 1

[0037] Step 1, in 300 ml of deionized water, 0.4 g of Tween-20, 0.1 g of sodium sulfate, 0.1 gmO-2170 defoamer, 60 ° C, 600 rpm was stirred for 30 minutes to prepare an emulsifier solution A.

[0038] Step 2, in 50 ml of ethyl acetate, 5 g of palmitic acid, 0.5 g of ethylcellulose, 65 ° C, 600 rpm is stirred for 30 minutes to palmitic acid and ethylcellulose completely dissolve, produce ethylcellulose and palmitic acid Ethyl acetate solution B.

[0039] Step 3,60 ° C, 600 rpm was added to the solution A to mix 4 h, at which time the ethyl acetate was completely volatilized, cooled to room temperature, then add 0.1 g of oxide oxide stirring for 2 h, filtration and washed, 40 ° C drying 24h The cellulose-based phase variable microcapsules prepared from oxidized graphene modified.

[0040] From figure 1 Understood, the present embodiment the phase change resulting spherical microcapsules, coated with ethylcellulose high, uniform and controlled morphology, particle...

Example Embodiment

[0041] Example 2

[0042] Step 1, in 300 ml of deionized water, 0.4 g of Tween-20, 0.1 g of sodium sulfate, 0.1 gmO-2170 defoamer, 60 ° C, 600 rpm was stirred for 30 minutes to prepare an emulsifier solution A.

[0043] Step 2, in 50 ml of ethyl acetate, 5 g of palmitic acid, 0.5 g of ethylcellulose, 65 ° C, 600 rpm is stirred for 30 minutes to palmitic acid and ethylcellulose completely dissolve, produce ethylcellulose and palmitic acid Ethyl acetate solution B.

[0044]Step 3,60 ° C, 600 rpm was added to the solution A mixed 4h, at which time the ethyl acetate was completely volatile, cooled to room temperature, then add 0.05 g of oxide oxide stirring for 2 h, filtrate and washed, 40 ° C dry 24h The cellulose-based phase variable microcapsules prepared from oxidized graphene modified.

[0045] The phase change microcapsules obtained in this example are also 200 to 300 μm, the phase change temperature is 63.3 ° C, the phase change latent heat is 163.78 J / g, the thermal conducti...

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Abstract

The invention relates to a graphene oxide modified cellulose-based phase change microcapsule and a preparation method thereof. The method comprises the following steps of 1, uniformly mixing lauryl sodium sulfate, Tween-20, an antifoaming agent and distilled water to obtain an emulsion, and uniformly mixing palmitic acid, ethyl cellulose and ethyl acetate to obtain a mixed solution, 2, uniformly mixing the mixed solution and the emulsion at 60-70 DEG C to obtain a mixed system A, cooling to room temperature after ethyl acetate in the mixed system A is completely volatilized, adding graphene oxide, and uniformly mixing to obtain a mixed system B, and 3, carrying out suction filtration on the mixed system B, washing the obtained product, and drying to obtain the graphene oxide modified cellulose-based phase change microcapsule. Palmitic acid is coated with more environment-friendly ethyl cellulose, and the ethyl cellulose is further modified with graphene oxide, so that the heat-conducting property of the final phase-change microcapsule is improved.

Description

technical field [0001] The invention belongs to the technical field of phase-change microcapsules, in particular to a graphene oxide-modified cellulose-based phase-change microcapsule and a preparation method thereof. Background technique [0002] In recent years, the basic research and application research of microencapsulation technology of phase change materials have attracted the attention of a large number of researchers. The microencapsulation of phase change materials effectively avoids the leakage of the core material, isolates the direct contact between the phase change material and the outside world, expands the contact area between the core material and the environment, increases the types of phase change materials that can be actually used, and makes the phase change material Changing microcapsules is more convenient and safe to use. [0003] Traditional phase-change microcapsules have always had disadvantages such as low thermal conductivity, flammability, and ...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/12
CPCB01J13/125C09K5/063
Inventor 张素风万奔崔书源
Owner SHAANXI UNIV OF SCI & TECH
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