Preparation method of nano-capsule composite phase change material

An energy storage material and composite phase change technology, applied in the direction of microcapsule preparation, microsphere preparation, heat exchange materials, etc., can solve the problems of poor thermal stability, existing environment, low heat transfer efficiency, etc., and achieve improved compactness and Mechanical strength, improve dispersion uniformity, and overcome the effect of low heat transfer coefficient

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] CN102191018A discloses a preparation method for synthesizing paraffin microcapsule energy storage materials by one-step method. In this method, the shell layer material adopts the polymerization reaction of urea and formaldehyde, and formaldehyde is toxic, and there are environmental pollution and personal safety problems, which greatly limit its use. industrial production
[0005] In CN101947423A, paraffin is used as the core material, and chitosan is used as the shell material to synthesize a microcapsule energy storage material with a core-shell structure, but chitosan is easy to decompose, has poor thermal stability, and has a short service life
[0006] CN101824307A discloses a preparation method of a phase-change energy storage material using tetraethyl orthosilicate as an inorganic silicon source and silicon dioxide as a shell material, using block polymer PEO-PPO-PEO as an emulsifier. The prepared microcapsule particles have a large particle size and a small unit heat transfer area, resulting in low heat transfer efficiency and affecting the energy storage effect

Method used

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  • Preparation method of nano-capsule composite phase change material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, add 0.1kg of compound emulsifier (mass ratio of sodium dodecylbenzenesulfonate to OP-10 is 0.4:0.7), 0.05kg of co-emulsifier diethylene glycol monobutyl ether into 2.5kg of distilled water, at 2000rpm Stirring at rotational speed for 10 minutes resulted in a clear aqueous solution. Then, 1 kg of n-heptadecane was added to the above clear solution, and stirred at 2000 rpm for 30 minutes in a water bath at 30° C. to form a uniform emulsion. 0.5 kg of tetraethyl orthosilicate and 0.02 kg of methylcellulose were sequentially added to the obtained emulsion, and stirred at 10000 rpm for 30 minutes. Add 0.5 kg of hydrochloric acid solution with a pH of about 2 slowly into the emulsion drop by drop to initiate hydrolysis polymerization reaction, react for 12 hours, stop stirring, cool the reaction product solution to room temperature, wash it several times with petroleum ether solution and distilled water, and filter it with suction , and dried to obtain a paraffin nano...

Embodiment 2

[0029] First, add 0.15kg of compound emulsifier (the mass ratio of sodium dodecylbenzenesulfonate to span-40 is 0.5:0.7), 0.03kg of co-emulsifier propylene glycol monobutyl ether into 2.5kg of distilled water, and stir at 2000rpm for 10 minutes , forming a clear aqueous solution. Then, 1.2 kg of n-octadecane was added to the above clear solution, and stirred at 2000 rpm for 30 minutes in a water bath at 40° C. to form a uniform emulsion. Add 1.0 kg of tetraethyl orthosilicate and 0.015 kg of hydrocarbon propyl-grade methyl cellulose in turn to the emulsion, and stir for 30 minutes at 10,000 rpm. Slowly drop 0.8kg of hydrochloric acid solution with a pH of about 2 into the emulsion drop by drop to initiate a hydrolysis polymerization reaction, react for 12 hours, stop stirring, cool the reaction product solution to room temperature, wash it several times with petroleum ether solution and distilled water, and filter it with suction , and dried to obtain the paraffin nanocapsule...

Embodiment 3

[0031]First, add 0.2kg of compound emulsifier (the mass ratio of sodium lauryl sulfate to OP-10 is 0.45:0.65), 0.05kg of co-emulsifier diethylene glycol monobutyl ether into 2.8kg of distilled water, and stir at 2000rpm for 10 minutes to form a clear aqueous solution. Then, 1 kg of n-nonadecane was added to the above clear solution, and stirred at 2000 rpm for 30 minutes in a 40° C. water bath to form a uniform emulsion. 0.5 kg of tetraethyl orthosilicate and 0.01 kg of ethyl cellulose were sequentially added to the obtained emulsion, and stirred at 10000 rpm for 30 minutes. Slowly drip 0.5kg of acetic acid solution with a pH of about 2 into the emulsion drop by drop to initiate a hydrolysis polymerization reaction. The reaction time is 12 hours, stop stirring, cool the reaction product solution to room temperature, and wash it several times with petroleum ether solution and distilled water repeatedly. After suction filtration and drying, the paraffin nanocapsule composite ph...

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Abstract

The invention discloses a preparation method of a nano-capsule composite phase change material. According to the invention, a composite emulsifier, a co-emulsifier and distilled water are added into a reaction kettle, such that a clarified solution is formed; an organic phase change material is added into the clarified solution, and stirring is carried out under a temperature higher by 5-10 DEG C than the phase change temperature, such that an emulsion is obtained; an inorganic silicon source and a stabilizing and dispersing agent are added into the emulsion, and the mixture is stirred, such that a uniformly dispersed stable emulsion is obtained; an acid solution catalyst is slowly dropped into the emulsion, such that silicon source hydrolysis and polymerization reactions are initiated; stirring is stopped when a white precipitate is completely precipitated; the reaction solution is naturally cooled to room temperature, and a precipitation solution is obtained; the precipitate is repeatedly washed by using a mixture of water and petroleum ether; and suction filtration and drying are carried out, such that the material is obtained. According to the nano-capsule composite phase change material provided by the invention, the particle size of capsule particles is smaller than 1mum. The material has relatively high chemical stability, thermal stability, heat transfer and thermal conduction performance, and phase change latent heat. The material can be widely applied in the fields of heat transfer and energy storage thermal insulation.

Description

technical field [0001] The invention relates to a preparation technology of a phase-change energy storage material, in particular to a nanocapsule composite phase-change energy storage material and a preparation method thereof. Background technique [0002] Energy is the material basis of human activities and an important restrictive factor for the development of human society. With the rapid development of social economy, the severe situation of energy shortage has appeared on a global scale, and it has become a common problem faced by all countries in the world. In today's highly developed science and technology level, in many cases, energy cannot be used effectively, resulting in waste of energy. In order to improve energy utilization efficiency, in the development and effective utilization of heat such as solar energy and industrial waste heat, phase change energy storage materials, as an effective thermal energy storage technology, are very active in the research of en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/14
Inventor 王海洋马蕊英赵亮薄德臣方向晨王刚
Owner CHINA PETROLEUM & CHEM CORP
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