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Ternary fatty acid/modified expanded vermiculite composite phase-change energy storage material

A technology of expanded vermiculite and composite phase change, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of low phase change latent heat, low thermal conductivity, etc., and achieve low phase change enthalpy, increase ratio Effects of surface area and adsorption rate improvement

Inactive Publication Date: 2016-06-08
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of ternary fatty acid / modified expanded vermiculite composite phase change energy storage material, which provides a kind of The carbon interlayer expanded vermiculite / carbon composite material is activated by acid to form a modified expanded vermiculite as a supporting matrix, and then combined with a ternary fatty acid organic phase change material to obtain a ternary fatty acid / modified expanded vermiculite composite phase change storage The material has the advantages of excellent heat storage capacity, good thermal conductivity and good cycle performance.

Method used

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  • Ternary fatty acid/modified expanded vermiculite composite phase-change energy storage material

Examples

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Embodiment 1

[0027] (1) Mix capric acid, lauric acid, and myristic acid evenly in a weight ratio of 55.1:30.4:14.5, put it in a constant temperature water bath at 45°C, heat and stir for 30 minutes, and take it out to cool to room temperature after ultrasonication for 5 minutes; use differential scanning The phase transition temperature of capric acid / lauric acid / myristic acid ternary eutectic mixture measured by calorimetry is 16.43℃, and the latent heat of phase transition is 153.4J / g;

[0028] (2) Weigh 30g of expanded vermiculite and add it to 600g of distilled water, place it in a 60°C constant temperature water bath and stir vigorously for 40min, then add 105g of cetyltrimethylammonium bromide aqueous solution with a mass fraction of 1%, 70 Stir at constant temperature at ℃ for 2 hours, then keep warm in a water bath at 80℃ for 12h, stand at room temperature for 12h, then dry at 70℃ for 24h, then raise the temperature to 600℃ at a rate of 3℃ / min in a reducing atmosphere, and keep at t...

Embodiment 2

[0031] (1) Mix capric acid, myristic acid, and stearic acid evenly in a weight ratio of 72.5:22.5:5.0, heat and stir in a constant temperature water bath at 70°C for 30 minutes, take it out and cool it to room temperature after ultrasonication for 5 minutes; The phase transition temperature of capric acid / myristic acid / stearic acid ternary eutectic mixture was determined by thermal method to be 24.02°C, and the latent heat of phase transition was 156.3J / g.

[0032](2) Weigh 30g of expanded vermiculite and add it to 600g of distilled water, place it in a constant temperature water bath at 70°C and stir vigorously for 60min, then add 105g of cetyltrimethylammonium bromide aqueous solution with a mass fraction of 5%, 60 Stir at constant temperature at ℃ for 4 hours, keep warm in a water bath at 85°C for 10 hours, let stand at room temperature for 15 hours, then dry at 80°C for 48 hours, then raise the temperature to 700°C at a rate of 1°C / min under a reducing atmosphere, and keep ...

Embodiment 3

[0035] (1) Mix myristic acid, palmitic acid, and stearic acid evenly in a weight ratio of 51.3:33.2:15.5, put them in a constant temperature water bath at 65°C, heat and stir for 30 minutes, and take them out to cool to room temperature after ultrasonication for 5 minutes; The phase transition temperature of myristic acid / palmitic acid / stearic acid ternary eutectic mixture was determined by scanning calorimetry to be 39.62°C, and the latent heat of phase transition was 177.5J / g.

[0036] (2) Weigh 30g of expanded vermiculite and add it to 600g of distilled water, place it in a constant temperature water bath at 80°C and stir vigorously for 20min, then add 105g of cetyltrimethylammonium bromide aqueous solution with a mass fraction of 10%, 80 Stir at a constant temperature of ℃ for 2 hours, keep warm in a water bath at 90 ℃ for 8 hours, let stand at room temperature for 10 hours, then dry at 70 ℃ for 72 hours, then raise the temperature to 800 ℃ at a rate of 5 ℃ / min under a redu...

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Abstract

The invention discloses a ternary fatty acid / modified expanded vermiculite composite phase-change energy storage material. Modified expanded vermiculite formed by conducting acid activation treatment on a carbon sandwich type expanded vermiculite / carbon compound serves as a supporting substrate, a molten ternary fatty acid eutectic mixture is added, the ternary fatty acid / modified expanded vermiculite composite phase-change energy storage material is prepared through a vacuum impregnation adsorption method, and by weight, the ternary fatty acid eutectic mixture accounts for 39.7-64.4%. The obtained composite phase-change energy storage material has a high heat conductivity coefficient and a phase change enthalpy value, leakage is avoided, heat stability is good, the preparation method is simple, cost is low, energy is saved, the environment is protected, the problem that an existing energy storage material is low in phase change enthalpy value and low in heat conductivity coefficient is solved, the phase change temperature of the composite phase-change energy storage material can be adjusted and controlled through the variety of fatty acid and the mass ratio, and the application field of the composite phase-change energy storage material is further broadened.

Description

technical field [0001] The invention belongs to the technical field of energy-saving energy storage materials, and in particular relates to a ternary fatty acid / modified expanded vermiculite composite phase-change energy storage material and a preparation method thereof. Background technique [0002] The rapid development of social economy and science and technology has put forward higher requirements for the effective use of energy, thus promoting the development of energy-saving materials. Phase change energy storage materials, also known as latent heat storage materials, are materials that store, convert and effectively utilize energy through phase change latent heat. The use of phase change energy storage materials can solve the contradiction between energy supply and demand in time and space, which is one of the effective ways to alleviate energy shortage. [0003] Phase change energy storage materials can be divided into inorganic phase change materials and organic ph...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/06
Inventor 李湘祁魏海婷林性水谢秀珍
Owner FUZHOU UNIVERSITY
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