Method for preparing inorganic hydrous salt phase transition energy-storing material
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A phase change energy storage material, inorganic salt technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of supercooling, phase separation, etc., to maintain stability, avoid differences, avoid phase separation and The effect of layering
Active Publication Date: 2008-08-06
SHENZHEN INST OF ADVANCED TECH
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[0005] The problem to be solved by the present invention is to provide a preparation method of an inorganic salt hydrate phase-change energy storage material to solve the problem of phase-change energy storage materials in the prior art Problems of supercooling and phase separation during synthesis
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Embodiment 1
[0021] Carry out the following experimental steps according to each component specified in Table 1:
[0022] Step 1. Take 5 grams of acrylic acid, add 20 grams of water and 0.1 grams of NaHSO 3 , stirred and mixed, heated to 70°C to prepare an acrylic acid solution;
[0023] Step 2, get 10 grams of water, add 0.76 grams (NH 4 ) 2 S 2 o 8 After mixing evenly, add dropwise to the acrylic acid solution prepared in step 1, and keep stirring at 70° C. for 1.5 hours to obtain a sodium polyacrylate solution;
[0024] Step 3, after the viscosity of the sodium polyacrylate solution in step 2 reaches a certain level, add 3 grams of NaOH to the solution, stir and mix, neutralize excess acid, and obtain a viscous sodium polyacrylate solution;
[0025] Step 4, with 70 grams of water, 4 grams of borax (sodium tetraborate) and 40 grams of Na 2 SO 4 Mix and dissolve to make Na 2 SO 4 mixture;
[0026] Step 5, the sodium polyacrylate solution that makes in step 3 is added to the Na t...
Embodiment 2
[0029] Repeat the experimental procedure in Example 1 by each component specified in Table 1, but the consumption of acrylic acid is changed into 7 grams, and the consumption of borax is changed into 3 grams.
[0030] The test results of this embodiment are shown in Figure 2b.
Embodiment 3
[0032] Repeat the experimental procedure in Example 1 by each component specified in Table 1, but the consumption of acrylic acid is changed into 7 grams, and the consumption of borax is changed into 4 grams.
[0033] The test results of this embodiment are shown in Figure 2c.
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Abstract
The invention discloses a preparation process of inorganic salt hydrate phase-change energy-storage material, comprises the following steps that adding 40-60g inorganic salt particles and 3-5g overcooling- resistance agent in 100g water, stirring and mixing to prepare hydrating inorganic salt solution, adding 5-10g poly-sodium acrylate in the hydrating inorganic salt solution, and stirring and mixing to prepare viscous hydrating inorganic salt mixed solution. The preparation process of hydrating inorganic salt phase-change material which is provided by the invention is added with overcooling- resistance agent and poly-sodium acrylate in the preparation process, which can effectively avoid the hydrating inorganic salt phase-change material from generating the phenomenon of over-cooling and phase separation in the phase change process, and ensures hydrating inorganic salt phase-change material to keep uniformity after repeated circulating.
Description
technical field [0001] The invention relates to a preparation method of a phase change energy storage material, in particular to a preparation method of an inorganic hydrated salt phase change energy storage material. Background technique [0002] Phase change energy storage materials use the characteristics of materials to store or release energy when they absorb or release heat during phase change. Compared with sensible heat and chemical reaction heat storage, the biggest advantage of phase change energy storage is The heat storage density is high, and the heat storage and release process is approximately isothermal. [0003] The existing phase-change low-temperature energy storage materials are mainly based on Na 2 SO 4 10H 2 O is the main raw material, and its energy storage calorific value per unit mass is extremely large, about 241 J / g; however, Na 2 SO 4 10H 2 The melting process of O belongs to heterogeneous melting, which has serious supercooling and phase se...
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