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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 microcapsules theoretically. Excellent thermal conductivity, avoiding its flammability, enhancing compatibility when mixed with other materials, and improving safety, avoiding certain pollution and damage to the surrounding environment, but there is no relevant report yet

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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preparation example Construction

[0031] A method for preparing graphene oxide-modified cellulose-based phase-change microcapsules of the present invention is prepared according to the amount of raw materials mentioned above, specifically comprising the following steps:

[0032] (1) Prepare an aqueous solution of emulsifier, add distilled water to sodium lauryl sulfate, Tween-20 and defoamer respectively, and finally stir at 60°C for 20 minutes at a stirring speed of 600-800rpm to obtain an aqueous solution of emulsifier .

[0033] (2) Prepare the ethyl acetate solution of palmitic acid and ethyl cellulose, put the palmitic acid and ethyl cellulose in a container, then add ethyl acetate, stir at 65°C until the palmitic acid and ethyl cellulose are completely dissolved.

[0034] (3) Add the ethyl acetate solution in step (2) into step (1) under stirring at 60-70°C, and mix for 4-6 hours at 600-1000 rpm, at which point the ethyl acetate is completely volatilized, and then After cooling to room temperature, grap...

Embodiment 1

[0037] Step 1, add 0.4g Tween-20, 0.1g sodium lauryl sulfate, 0.1g MO-2170 defoamer to 300mL deionized water, stir at 60°C and 600rpm for 30 minutes to prepare emulsifier solution A.

[0038] Step 2: Add 5g of palmitic acid and 0.5g of ethyl cellulose to 50mL of ethyl acetate, stir at 65°C and 600rpm for 30 minutes until the palmitic acid and ethyl cellulose are completely dissolved to obtain ethyl cellulose and palmitic acid Ethyl acetate solution B.

[0039] Step 3: Add solution B to solution A at 60°C and 600rpm and mix for 4h. At this time, the ethyl acetate is completely volatilized. Cool to room temperature, then add 0.1g graphene oxide and stir for 2h, filter and wash with suction, and vacuum dry at 40°C for 24h , to prepare graphene oxide-modified cellulose-based phase-change microcapsules.

[0040] From figure 1 It can be seen that the phase-change microcapsules obtained in this example are spherical, the ethyl cellulose coating rate is high, the shape is controllab...

Embodiment 2

[0042] Step 1, add 0.4g Tween-20, 0.1g sodium lauryl sulfate, 0.1g MO-2170 defoamer to 300mL deionized water, stir at 60°C and 600rpm for 30 minutes to prepare emulsifier solution A.

[0043] Step 2: Add 5g of palmitic acid and 0.5g of ethyl cellulose to 50mL of ethyl acetate, stir at 65°C and 600rpm for 30 minutes until the palmitic acid and ethyl cellulose are completely dissolved to obtain ethyl cellulose and palmitic acid Ethyl acetate solution B.

[0044]Step 3: Add solution B to solution A at 60°C and 600rpm and mix for 4h. At this time, the ethyl acetate is completely volatilized. Cool to room temperature, then add 0.05g graphene oxide and stir for 2h, filter and wash with suction, and dry in vacuum at 40°C for 24h , prepared graphene oxide-modified cellulose-based phase-change microcapsules.

[0045] The particle size of the phase-change microcapsules obtained in this example is also 200-300 μm, the phase-transition temperature is 63.3°C, the latent heat of phase-chan...

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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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