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Phase-change material micro-capsule and method for preparing same

A phase change material and microcapsule technology, applied in microcapsule preparations, microsphere preparation, heat exchange materials, etc., can solve the problems of low PCM content, unrecorded yield, low yield, etc., to reduce volatilization loss, The effect of improving paraffin coating rate and product yield

Active Publication Date: 2018-11-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] As can be seen from the above table, the present method generally has the defects of low PCM content and / or low yield, wherein the PCM content is the highest 70%, but there is no record yield (see reference 2); the highest yield is 70% , but the PCM content is only 37.2% (see reference 3)

Method used

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  • Phase-change material micro-capsule and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A phase change material microcapsule is prepared according to the following steps:

[0059] (1) Dissolve 1.2g of emulsifier in 80mL of water to form the water phase. The emulsifier is made of Span 80 and Tween 80 in a weight ratio of 1:2;

[0060] (2) 14g paraffin and 6g MMA are mutually dissolved to become an oil phase;

[0061] (3) Mix the oil phase and the water phase, and shear at a high speed of 6000rpm for 10min to form a stable emulsion, which is transferred to a flask for reaction;

[0062] (4) Add 0.25g ammonium persulfate and 0.13g sodium bisulfite, and react at 25°C for 5h;

[0063] (5) The above reaction product is left to stand, suction filtered, washed, and dried to constant weight to obtain phase change microcapsule powder.

[0064] The yield of the preparation method is 93.5%, and the content of paraffin in the microcapsules is 70%.

[0065] The 10% weight loss temperature of microcapsules is 171.6℃, the average particle size is 6.6μm, and the average...

Embodiment 2

[0067] A phase change material microcapsule is prepared according to the following steps:

[0068] (1) Dissolve 1.2g of emulsifier in 80mL of water to form the water phase. The emulsifier is a compound of Span 80 and Tween 80 at a weight ratio of 1:1.5;

[0069] (2) 14g paraffin and 6g MMA are mutually dissolved to become an oil phase;

[0070] (3) Mix the oil phase and the water phase, and shear at a high speed of 6000rpm for 10min to form a stable emulsion, which is transferred to a flask for reaction;

[0071] (4) Add 0.25g ammonium persulfate and 0.13g sodium bisulfite, and react at 25°C for 5h;

[0072] (5) The above reaction product is left to stand, suction filtered, washed, and dried to constant weight to obtain phase change microcapsule powder.

[0073] Compared with embodiment 1, embodiment 2 is different in that the component ratio of emulsifier is different. The yield of the preparation method is 94.2%, and the content of paraffin in the microcapsules is 68%. T...

Embodiment 3

[0075] A phase change material microcapsule is prepared according to the following steps:

[0076] (1) Dissolve 1.2g of emulsifier in 80mL of water to form the water phase. The emulsifier is made of Span 60 and Tween 60 in a weight ratio of 1:2;

[0077] (2) 14g paraffin and 6g MMA are mutually dissolved to become an oil phase;

[0078] (3) Mix the oil phase and the water phase, and shear at a high speed of 6000rpm for 10min to form a stable emulsion, which is transferred to a flask for reaction;

[0079] (4) Add 0.25g ammonium persulfate and 0.13g sodium bisulfite, and react at 25°C for 5h;

[0080] (5) The above reaction product is left to stand, suction filtered, washed, and dried to constant weight to obtain phase change microcapsule powder.

[0081] Compared with Example 1, Example 3 is different in that the kind of emulsifier is different. The yield of the preparation method is 95.6%, and the content of paraffin in the microcapsules is 68.5%. The 10% weight loss temp...

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Abstract

The invention relates to a phase-change material (PCM) micro-capsule and a method for preparing the same, in particular to phase-change micro-capsules with paraffin used as an energy storage materialand methods for preparing the phase-change micro-capsules. The phase-change material micro-capsule and the method have the advantages that a specific oxidation-reduction system is used as a micro-capsulation reaction initiator, reaction can be initiated at the low temperatures, accordingly, volatilization loss of monomers can be reduced, and reaction energy consumption can be economized.

Description

technical field [0001] The invention relates to a phase change material (PCM) microcapsule and a preparation method thereof, in particular to a phase change microcapsule using paraffin as an energy storage material and a preparation method thereof. Background technique [0002] Phase-change energy storage materials are widely used in solar energy utilization, building energy conservation, food, medicine, energy and other fields because of their characteristics of storing and releasing heat energy and weakening external temperature fluctuations. Commonly used phase change energy storage materials include hydrated inorganic salts, fatty acids, and paraffin, among which paraffin is more valued because of its wide phase transition temperature, low cost, high heat enthalpy, and low undercooling. However, the phase change of paraffin wax during the melting process will cause the risk of leakage, so it is necessary to encapsulate paraffin wax with microencapsulation technology, amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/14C08F4/40B01J13/14C09K5/06
CPCB01J13/14C08F4/40C08F120/14C09K5/063
Inventor 杨睿徐冬
Owner TSINGHUA UNIV
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