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SiO2 and nitrate microcapsule phase change heat storage composite material and preparation method thereof

A technology of phase change heat storage and composite materials, which is applied in the field of SiO2@nitrate microcapsule phase change heat storage composite materials and its preparation, can solve the problems of easy leakage and low thermal conductivity, and achieve reduced leakage and high thermal conductivity , Solve the effect of corrosion and leakage

Pending Publication Date: 2022-05-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a SiO 2 @Nitrate microcapsule phase change heat storage composite material, which has the characteristics of high coating rate, high thermal conductivity and excellent light-to-heat conversion efficiency

Method used

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  • SiO2 and nitrate microcapsule phase change heat storage composite material and preparation method thereof
  • SiO2 and nitrate microcapsule phase change heat storage composite material and preparation method thereof
  • SiO2 and nitrate microcapsule phase change heat storage composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] A GO / SiO 2 @Solar Salt microcapsule phase change heat storage composite material, which is composed of microcapsules and carbon materials. The microcapsules use nitrate as the core material and SiO 2 is the core-shell structure of the shell layer; the two-dimensional GO nanosheets are the modified loading materials of the microcapsules. The specific preparation method includes the following steps:

[0055] (1) Pretreatment: 5g of Solar Salt was completely dissolved in 12ml of deionized water and transferred to a 100ml flask to obtain mixed solution A (aqueous phase solution); 50mg of GO solution (concentration 1wt%) was dispersed in 18ml of CPME Placed in an ultrasonic disperser at 30°C for ultrasonic dispersion for 30min, to obtain a mixed solution B (oil phase solution); the flask (mixed solution A) was placed in a 30°C constant temperature magnetic stirrer and stirred for 10min, with a stirring speed of 800rpm / min, stirring After homogeneous, add mixed solution B a...

Embodiment 2

[0061] A GO / SiO 2 @Solar Salt microcapsule phase change heat storage composite material, which is composed of microcapsules and carbon materials. The microcapsules use nitrate as the core material and SiO 2 is the core-shell structure of the shell layer; the two-dimensional GO nanosheets are the modified loading materials of the microcapsules. The specific preparation method includes the following steps:

[0062] (1) Pretreatment: 5g of Solar Salt was completely dissolved in 12ml of deionized water and transferred to a 100ml flask according to the weight to obtain mixed solution A; 100mg of GO (2wt%) was dispersed in 18ml of CPME and placed in an ultrasonic disperser at 30°C Ultrasonic dispersion was carried out for 40 min to obtain mixed solution B, which was set aside for use; the flask (mixed solution A) was placed in a constant temperature magnetic stirrer at 30°C and stirred for 10 min, and the stirring speed was 800 rpm / min. After stirring evenly, mixed solution B and 1...

Embodiment 3

[0068] A GO / SiO 2 @Solar Salt microcapsule phase change heat storage composite material, which is composed of microcapsules and carbon materials. The microcapsules use nitrate as the core material and SiO 2 is the core-shell structure of the shell layer; the two-dimensional GO nanosheets are the modified loading materials of the microcapsules. The specific preparation method includes the following steps:

[0069] (1) Pretreatment: 5g Solar Salt was completely dissolved in 12ml deionized water and transferred to a 100ml flask according to the weight to obtain mixed solution A; 150mg GO (3wt%) was dispersed in 18ml CPME and placed in an ultrasonic disperser at 30°C Ultrasonic dispersion was carried out for 30 min to obtain mixed solution B, which was set aside for use; the flask (mixed solution A) was placed in a constant temperature magnetic stirrer at 30°C and stirred for 10 min, and the stirring speed was 800 rpm / min. After stirring evenly, mixed solution B and 1.5 ml of Spa...

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Abstract

The invention discloses a SiO2 at nitrate microcapsule phase change heat storage composite material and a preparation method thereof, nitrate is used as a core material, SiO2 is used as a shell material, a stable core-shell structure is formed, and a carbon material is used as a modified load material. The microcapsule phase change heat storage composite material has the characteristics of high heat conductivity, excellent photothermal conversion efficiency and the like, the heat conductivity of the material is 0.550-0.700 W.m <-1 >. K <-1 >, the coating rate reaches 60% or above, and the heat storage efficiency of the material is effectively improved. According to the invention, a sol-gel method is adopted to prepare the small-size microcapsule tightly coated with regular spherical SiO2, so that the problem of water limitation of nitrate is solved, the defects of nitrate are changed into advantages, the morphology structure of the microcapsule material is improved, and the influence of volume change and external stress in the phase change process of the core material can be effectively resisted; moreover, the two-dimensional GO nanosheets with good thermal conductivity, light absorptivity and mechanical properties are introduced to construct a stable structure uniformly-loaded microcapsule, and the material performance is further improved by enhancing the structure.

Description

technical field [0001] The present invention relates to a kind of SiO 2 @Nitrate microcapsule phase change heat storage composite material and preparation method thereof, the material belongs to the field of energy, and is applied to the fields of solar light utilization and thermal energy storage. Background technique [0002] Solar energy has the advantages of abundant resources, environmental friendliness, and universality. However, due to its inability to be directly stored and difficult to transport, how to utilize solar energy more efficiently has become one of the research hotspots in the environmental protection and energy materials industry in recent years. Scientists have used phase change thermal storage materials to store and transport the heat generated by the sun after long-term research. For example, molten salt phase change thermal storage with low vapor pressure, high latent heat and wide operating temperature range is often used in solar thermal power gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/02
CPCC09K5/063B01J13/02Y02E70/30
Inventor 李元元谷牧阳季维程晓敏
Owner WUHAN UNIV OF TECH
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