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Inorganic hydrated salt silica phase-change material and preparation method thereof

A technology of inorganic hydrated salt and silica, applied in chemical instruments and methods, materials for heat exchange, etc., can solve problems such as supercooling and phase separation

Active Publication Date: 2010-11-10
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Inorganic hydrated salt materials are one of the commonly used low-cost phase change materials, however, there are problems of supercooling and phase separation in the phase change process, such as figure 1 Shown is its phase change step cooling curve, therefore, it is necessary to add anti-supercooling agent and phase separation agent; at the same time, its phase change energy storage process includes a solid-liquid transition process, so it needs to be packaged before practical application to prevent liquid leakage

Method used

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  • Inorganic hydrated salt silica phase-change material and preparation method thereof
  • Inorganic hydrated salt silica phase-change material and preparation method thereof
  • Inorganic hydrated salt silica phase-change material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Proceed according to the scheme given in Table 1:

[0027] A, add 18 grams of anhydrous sodium sulfate particles in 40 grams of water, stir evenly under 45 ℃ of conditions, make sodium sulfate inorganic hydrated salt saturated solution, then the inorganic hydrated salt saturated solution that makes is equally divided into two parts.

[0028] B. Slowly add 2ml of 98wt% concentrated sulfuric acid solution dropwise to one of the inorganic hydrated salt solutions, and magnetically stir evenly at 45°C to obtain an inorganic hydrated salt sulfuric acid solution.

[0029] C. Add 10 grams of sodium metasilicate nonahydrate particles to another inorganic hydrated salt solution, and stir at 45°C until the sodium metasilicate nonahydrate is completely dissolved to obtain an inorganic hydrated sodium metasilicate solution.

[0030] D, under the condition of magnetic stirring at 45°C, slowly add 5ml of cyclohexane and 0.1ml of sorbitan monooleate (span80) dropwise to the inorganic h...

Embodiment 2

[0036] Repeat the experimental steps in Example 1 according to the scheme given in Table 1, but after mechanical stirring to obtain a uniform suspension of colloidal particles, it is transferred to a suitable container and placed in the air at a temperature of 10 to 20 ° C. After standing for 1-3 hours, and sealing the upper surface with dimethyl silicone oil, an inorganic hydrated silicon dioxide phase-change material with a stable porous microstructure can be prepared.

[0037] The step cooling curve figure of this embodiment is as Figure 2b shown.

Embodiment 3

[0039] Repeat the experimental steps in Example 2 according to the scheme given in Table 1, but the volume of the 98% concentrated sulfuric acid added dropwise in step B is 3mL, the quality of the sodium metasilicate nonahydrate added in step C is 15g, and the colloidal particles The time for the suspension to stand in the air is 1 to 2 hours.

[0040] The step cooling curve figure of this embodiment is as Figure 2c shown.

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Abstract

The invention relates to an inorganic hydrated salt silica phase-change material, which is composed of silica gel and an inorganic hydrated salt material filled in the porous structure formed by the silica gel. The invention also provides a preparation method of the inorganic hydrated salt silica phase-change material. The inorganic hydrated salt silica phase-change material in the invention can realize dual effects of overcooling prevention and phase separation of the inorganic hydrated salt, improves phase change energy storage utilization rate, prevents crystal water loss to a certain extent due to protection of surfactant and oil phase, inhibits the porous structure from being damaged by growth of crystals, has stable properties and certain strength, lowers cost and is suitable for large-area encapsulation.

Description

【Technical field】 [0001] The invention relates to the field of phase change energy storage materials, in particular to an inorganic hydrated salt silica phase change material and a preparation method thereof. 【Background technique】 [0002] As early as the 1950s, NASA used phase change heat storage technology to achieve thermal insulation in space, and now, this technology has been developed in the direction of low-cost civilian energy storage materials. It uses the phase change process of matter to store or release heat energy, thereby realizing the control of ambient temperature. Utilizing the phase change characteristics of phase change materials can not only improve the utilization rate of various energy sources, save energy, but also realize the controllability of the ambient temperature. At the same time, phase change materials can be reused, and using phase change materials to store energy is a low-cost and effective energy-saving method. [0003] Inorganic hydrated...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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