High-stability composite phase-change material and preparation method

A composite phase change material, high stability technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as cycle stability deterioration, and achieve the effects of stable performance, improved stability, and less equipment investment

Active Publication Date: 2017-02-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned earlier, pure Na 2 SO 4 10H 2 As a phase change material, in the process of solid / liquid phase transition, adjacent particles melt and merge, and then a two-phase structure of free water / inorganic salt appears, resulting in poor cycle stability.

Method used

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  • High-stability composite phase-change material and preparation method
  • High-stability composite phase-change material and preparation method
  • High-stability composite phase-change material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Weigh Na 2 SO 4 10H 2 O 6 kilograms of inorganic hydrated salts were placed in a stirred tank and the temperature was raised to 40° C., until the inorganic hydrated salts became molten.

[0031] 2) In molten Na 2 SO 4 10H 2 Add 0.18 kilograms of borax in O inorganic hydrated salt. Keep the temperature at 40°C, continue stirring for 60 minutes, then lower the temperature and cool to room temperature to obtain a mixed salt. The mixed salt is ball-milled to 100 mesh in a ball mill, and sieved for later use.

[0032] 3) Weigh 3.7 kg of polyacrylamide, add distilled water, and stir evenly in the stirring tank to form a viscosity of 5×10 4 centipoise polymer colloid. Put in the mixed salt described in step 2 and stir well.

[0033] 4) Transfer the material obtained in step 3 to a kneading pot, and knead at room temperature for 0.5 hours. During the kneading process, the two knife rollers cut, pulled, and extruded the compound of inorganic hydrated salt / polymer co...

Embodiment 2

[0035] 1) Weigh Na 2 SO 410H 2 O 9.4 kilograms of inorganic hydrated salts were placed in a stirred tank and the temperature was raised to 45° C., until the inorganic hydrated salts became molten.

[0036] 2) In molten Na 2 SO 4 10H 2 Add 0.1 kg of borax to the inorganic hydrated salt, keep the temperature at 45° C., continue to stir for 50 minutes, then lower the temperature and cool to room temperature to obtain a mixed salt. The mixed salt is ball-milled to 150 mesh in a ball mill, and sieved for later use.

[0037] 3) Drop into 5 kilograms of acrylic acid amide / sodium acrylate binary copolymers in the stirred tank. Add distilled water to form a viscosity of 8×10 6 Colloids in centipoise. Put the mixed salt obtained in step 2 into the colloid, and stir evenly.

[0038] 4) Transfer the materials in step 3 to a kneading pot, heat the kneading pot to 40° C., and knead at this temperature for 2 hours. During the kneading process, part of the free water of the inorgani...

Embodiment 3

[0040] 1) Weigh Na 2 SO 4 10H 2 O 6.5 kilograms of inorganic hydrated salts were placed in a stirred tank and the temperature was raised to 40° C., until the inorganic hydrated salts became molten.

[0041] 2) In molten Na 2 SO 4 10H 2 Add 0.13 kg of borax to the O inorganic hydrated salt, keep the temperature of 40° C., continue to stir for 1 hour, then lower the temperature and cool to room temperature to obtain a mixed salt. Grind the mixed salt in a ball mill to 200 mesh, sieve and set aside

[0042] 3) Put 3.37 kg of carboxyethyl cellulose into the stirring tank, add distilled water, and stir for 30 minutes to form a viscosity of 1 × 10 5 centipoise jelly. Put in the mixed salt described in step 2 and stir well.

[0043] 4) Transfer the material in step 3 to a kneading pot, and knead at 30° C. for 0.6 hours. During the kneading process, the two knife rollers shear, pull and extrude the compound of the inorganic hydrated salt / polymer colloid from opposite and oppo...

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Abstract

A high-stability composite phase-change material is prepared from, by mass, 60-94wt.% of inorganic salt hydrate, 1-3wt.% of a nucleating agent and 5-37wt.% of a polymer. The high-stability composite phase-change material has the advantages of being good in cycling stability and high in phase-change latent heat.

Description

technical field [0001] The invention belongs to a phase change material and a preparation method, in particular to a highly stable inorganic hydrate salt composite phase change material and a preparation method. Background technique [0002] The storage and utilization of thermal energy is an important part in the field of energy saving and emission reduction. Phase change materials can absorb / release a large amount of heat when a biological phase transition (solid / liquid, liquid / gas, etc.) occurs, and the temperature fluctuation is small at the same time. Therefore, phase change energy storage technology has unique advantages and broad application prospects in the storage and utilization of thermal energy. These fields include solar heat storage heating, building energy saving, constant temperature drying, thermal management of electronic devices, etc. The core of phase change energy storage technology is the phase change material with high phase change latent heat and go...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 陶则超王宏宝赵文光连鹏飞刘占军郭全贵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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