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A diatom-based phase-change energy storage material and its preparation method and application

A phase-change energy storage material, diatom-based technology, applied in the field of energy storage materials, can solve the problems of a single diatom, the inability to form a shell shape in large quantities, and the slow natural formation of diatomite, so as to achieve fast growth and relative The effects of large latent heat and high specific surface area

Active Publication Date: 2022-01-14
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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  • A diatom-based phase-change energy storage material and its preparation method and application
  • A diatom-based phase-change energy storage material and its preparation method and application
  • A diatom-based phase-change energy storage material and its preparation method and application

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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 energy storage material includes diatom frustule and phase change medium, wherein the diatom frustule has a higher specific surface area, compared with the existing diatomite, and phase change medium The energy storage material obtained after combination has high melting enthalpy and crystallization enthalpy, good comprehensive performance, and no leakage of phase change medium; The diatom frustule is obtained after pretreatment, and then combined with a phase change medium, and the preparation process is simple.

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 Patents(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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