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Diatom-based phase change energy storage material, and preparation method and application thereof

A phase change energy storage material, diatom-based technology, applied in the field of energy storage materials, can solve the problems of inability to form shell shapes in large quantities, slow natural formation of diatomite, single diatom, etc., and achieve a large amount of phase change medium. , the effect of high latent heat of phase transition and simple preparation process

Active Publication Date: 2020-09-29
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the natural formation of diatomite is too slow, and it is impossible to form diatoms with a relatively simple shell shape in large quantities, so the commercial production of diatoms has attracted the attention of the market

Method used

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  • Diatom-based phase change energy storage material, and preparation method and application thereof
  • Diatom-based phase change energy storage material, and preparation method and application thereof
  • Diatom-based phase change energy storage material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0073] This embodiment provides a diatom-based phase change energy storage material, the phase change energy storage material is composed of diatom frustules and polyethylene glycol 4000 with a mass ratio of 0.68:1, and its preparation method includes the following steps:

[0074] (1) After the artificially cultivated diatoms are centrifuged and air-dried, they are pickled with hydrochloric acid with an acid mass concentration of 20wt% for 20 hours and dried to obtain the first diatom frustules;

[0075] Sintering the first diatom frustule at 600°C for 2 hours to obtain the second diatom frustule;

[0076] (2) Pre-mix the second diatom frustules with polyethylene glycol 4000 at a mass ratio of 33:67 to obtain a mixture, which is heated at 80°C for 1 hour under stirring conditions, and then heated at 80°C under 15kPa vacuum conditions. Under the condition of melting and impregnating for 12 hours, the molten mixture was obtained;

[0077] (3) Place the molten mixture described ...

Embodiment 2

[0079] This embodiment provides a method for preparing a diatom-based phase-change energy storage material. The phase-change energy storage material is composed of diatom frustules and polyethylene glycol 4000 with a mass ratio of 0.88:1. In addition to directly using The first diatom frustule in step (1) is pre-mixed with polyethylene glycol 4000 to prepare a diatom-based phase change energy storage material, and the ratio of the first diatom frustule to polyethylene glycol 4000 is adjusted to 47: Except 53, all the other are identical with embodiment 1.

Embodiment 3

[0081] This embodiment provides a diatom-based phase change energy storage material, the phase change energy storage material is composed of diatom frustule and lauric acid with a mass ratio of 0.35:1, and its preparation method includes the following steps:

[0082] (1) After the artificially cultured diatoms are centrifuged and air-dried, they are acid-washed with sulfuric acid whose mass concentration is 10 wt% for 48 hours and dried to obtain the first diatom frustules;

[0083] Sintering the first diatom frustule at 800°C for 1 hour to obtain the second diatom frustule;

[0084] (2) Premix the second diatom frustules with lauric acid at a mass ratio of 24:71 to obtain a mixture, which is heated at 60°C for 1 hour under stirring conditions, and then melted at 60°C under 5kPa vacuum conditions Dipping for 24 hours to obtain the molten mixture;

[0085] (3) Place the molten mixture described in step (2) on the filter paper, cool naturally to room temperature, and judge whet...

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Abstract

The invention provides a diatom-based phase change energy storage material. The material comprises a diatom shell and a phase change medium; the diatom shell is high in specific surface area; and compared with existing diatomite, the energy storage material obtained after the diatom shell is combined with the phase change medium is high in melting enthalpy and crystallization enthalpy, good in comprehensive performance and free of leakage of the phase change medium. The invention also provides a preparation method of the diatom-based phase change energy storage material. According to the invention, the diatom shell is obtained by pretreating artificially cultured diatom, and then combined with the phase change medium, so the preparation method is simple in process.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a diatom-based phase-change energy storage material and its preparation method and application. Background technique [0002] Since mankind entered the industrial society, traditional energy is being consumed at an alarming rate, and mankind is facing an unprecedented energy crisis. The deteriorating environment makes human beings realize the importance of saving energy, finding new energy and protecting the environment. Therefore, people should research and utilize renewable energy. In renewable energy, solar energy, wind energy, biomass energy, etc. are all substitutes for traditional energy, but these energy sources have shortcomings such as intermittency and volatility. In order to solve these problems, the characteristics of phase change materials can be used to realize the time-space conversion of energy. The essential meaning of material energy storage i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 孙大陟黄锦涛吴邦耀李丹丹李涛马斐张江涛罗均龙
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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