CN111978929A - Organic-inorganic composite phase change energy storage material and preparation method thereof - Google Patents
Organic-inorganic composite phase change energy storage material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an organic-inorganic composite phase change energy storage material and a preparation method thereof. The organic-inorganic composite phase change energy storage material is prepared from 74.25-84.00% by mass of erythritol, 0.70-1.40% by mass of a nucleating agent (one of anhydrous disodium hydrogen phosphate and barium hydroxide octahydrate) and 15.0-25.0% by mass of sodium acetate trihydrate. The phase change energy storage material has the phase change temperature range of 47.0-87.1 ℃, has low supercooling degree, and can be applied to the fields of clean heating, agricultural greenhouses and the like.
Description
Technical Field
The invention relates to an organic-inorganic composite phase change energy storage material and a preparation method thereof, belonging to the field of clean energy.
Background
Phase Change Material (PCM) refers to a substance that changes its state and provides latent heat at a constant temperature. The process of changing physical states is called a phase change process, in which the phase change material absorbs or releases a large amount of latent heat. Latent heat energy storage, or phase change energy storage, is a technology for storing heat energy by using a phase change material to absorb or release heat when the state of the material changes, and has the advantages of high energy storage density, high efficiency, heat absorption and heat release at approximately constant temperature and the like, so that the latent heat energy storage can be applied to various fields, such as peak shifting and valley filling by using electric power, recycling of industrial waste heat and waste heat, intelligent air-conditioning buildings, temperature and humidity regulation, engineering heat insulation materials, medical care, textile industry and the like.
Phase change materials are mainly classified into organic, inorganic and composite types. The organic phase-change material mainly comprises paraffin, fatty acid, alkane and the like; the inorganic phase-change material mainly comprises inorganic hydrated salt, molten salt, metal alloy and the like. The organic phase-change material has the defects of poor heat-conducting property, large volume change in the phase-change process, low flash point, combustibility and the like; inorganic hydrated salts have problems of supercooling, phase separation and toxicity in different degrees; the price of molten salts and metal alloys is very high and the field of application is limited. The composite phase-change heat storage material can effectively overcome the defects of single inorganic or organic phase-change heat storage materials, and the abundant types and combinations can also widen the performance index range and the application field of the phase-change material. Therefore, the development and research of composite phase change energy storage materials are one of the hot issues in the energy field.
Erythritol, also called 1,2,3, 4-erythritol, is a phase change energy storage material, has stable chemical and thermal properties, is nontoxic and harmless, and has a latent heat value as high as 340 kJ/kg. Erythritol has two serious defects in the process of being used as a phase change energy storage material, namely poor heat conduction performance and heat conduction coefficient of only 0.77W/(m.K), and very serious supercooling of up to 100 ℃. Li Junfeng et al (patent publication No. CN 106281235A, a polyol composite phase-change material and a preparation method thereof) only reduces the supercooling degree of erythritol to 35-50 ℃ through ternary eutectic crystal of pentaerythritol, xylitol and erythritol, and needs further improvement. By adding chopped carbon fibers into erythritol, the scholars of tonicity and the like prepare the composite phase change material (patent publication No. CN 105331334A, a preparation method of a chopped carbon fiber/erythritol phase change composite material), and the thermal conductivity of the composite phase change material is improved to 1.521W/(m.K). At present, few reports exist on documents for preparing organic-inorganic composite phase change energy storage materials by adding inorganic hydrated salt sodium acetate trihydrate and a nucleating agent into erythritol.
Disclosure of Invention
The invention aims to provide an organic-inorganic composite phase change energy storage material and a preparation method thereof. The phase change temperature range of the organic-inorganic composite phase change energy storage material is 47.0-87.1 ℃, the supercooling degree is low, the organic-inorganic composite phase change energy storage material can be applied to the fields of clean heating, agricultural greenhouses and the like, the preparation method is simple and feasible, and the organic-inorganic composite phase change energy storage material is suitable for industrial popularization.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an organic-inorganic composite phase change energy storage material, which is characterized in that: the organic-inorganic composite phase change energy storage material is prepared from 74.25-84.00% by mass of erythritol, 0.70-1.40% by mass of nucleating agent and 15.0-25.0% by mass of sodium acetate trihydrate.
A preparation method of an organic-inorganic composite phase change energy storage material comprises the following steps:
(1) mixing erythritol, a nucleating agent and sodium acetate trihydrate, mashing and grinding uniformly;
(2) heating the solid mixture on a magnetic stirrer at 140 ℃ until a proper amount of liquid is melted, starting stirring, and continuing stirring for 1.0-1.5 h under heat preservation to obtain a liquid substance;
(3) and naturally cooling the liquid substance to room temperature to obtain a white solid, namely the organic-inorganic composite phase change energy storage material.
The nucleating agent is one of anhydrous disodium hydrogen phosphate or octahydrate barium hydroxide.
Drawings
FIG. 1 is a step-cooling curve diagram of an organic-inorganic composite phase-change energy storage material 1 according to example 1 of the present invention.
FIG. 2 is a step-cooling curve diagram of the organic-inorganic composite phase-change energy storage material 2 in example 2 of the present invention.
FIG. 3 is a step-cooling curve diagram of the organic-inorganic composite phase-change energy storage material 3 in example 3 of the present invention.
FIG. 4 is a step-cooling curve diagram of the organic-inorganic composite phase-change energy storage material 4 in example 4 of the present invention.
FIG. 5 is a step-cooling curve diagram of the organic-inorganic composite phase-change energy storage material 5 in example 5 of the present invention.
FIG. 6 is a step-cooling curve diagram of the organic-inorganic composite phase-change energy storage material 6 in example 6 of the present invention.
Detailed Description
The present invention is described in detail by the following examples, which should be construed as limiting the scope of the invention and that the invention is not limited thereto.
Example 1
(1) Weighing 42.00 g of erythritol, 0.50 g of anhydrous disodium hydrogen phosphate and 7.50 g of sodium acetate trihydrate into a small beaker, mixing, mashing and grinding uniformly;
(2) Heating the solid mixture on a magnetic stirrer at 140 ℃ until a proper amount of liquid is melted, starting stirring, and continuing stirring for 1.5 hours at the constant temperature to obtain a liquid substance;
(3) and naturally cooling the liquid substance to room temperature to obtain a white solid, namely the organic-inorganic composite phase change energy storage material 1.
The phase change temperature of the organic-inorganic composite phase change energy storage material 1 is 87.1 ℃, the supercooling temperature is 83.5 ℃, the step cooling curve is shown in the attached figure 1 in detail, and the enthalpy value is 251.03J/g through the measurement of a Differential Scanning Calorimeter (DSC).
Example 2
(1) Weighing 37.13 g of erythritol, 0.38 g of anhydrous disodium hydrogen phosphate and 12.50 g of sodium acetate trihydrate in a small beaker, mixing, mashing and grinding uniformly;
(2) heating the solid mixture on a magnetic stirrer at 140 ℃ until a proper amount of liquid is melted, starting stirring, and continuing stirring for 1.0 hour under the condition of heat preservation to obtain a liquid substance;
(3) and naturally cooling the liquid substance to room temperature to obtain a white solid, namely the organic-inorganic composite phase change energy storage material 2.
The phase change temperature of the organic-inorganic composite phase change energy storage material 2 is 47.0 ℃, the supercooling temperature is 46.4 ℃, the step cooling curve is shown in the attached figure 2 in detail, and the enthalpy value is 109.79J/g through the measurement of a Differential Scanning Calorimeter (DSC).
Example 3
(1) Weighing 40.60 g of erythritol, 0.40 g of anhydrous disodium hydrogen phosphate and 9.00 g of sodium acetate trihydrate in a small beaker, mixing, mashing and grinding uniformly;
(2) heating the solid mixture on a magnetic stirrer at 140 ℃ until a proper amount of liquid is melted, starting stirring, and continuing stirring for 1.2 hours at the constant temperature to obtain a liquid substance;
(3) and naturally cooling the liquid substance to room temperature to obtain a white solid, namely the organic-inorganic composite phase change energy storage material 3.
The phase change temperature of the organic-inorganic composite phase change energy storage material 3 is 82.5-84.5 ℃, supercooling is almost avoided, the step cooling curve is detailed in figure 3, and the enthalpy value is 143.72J/g through Differential Scanning Calorimeter (DSC) measurement.
Example 4
(1) Weighing 41.10 g of erythritol, 0.40 g of anhydrous disodium hydrogen phosphate and 8.50 g of sodium acetate trihydrate in a small beaker, mixing, mashing and grinding uniformly;
(2) heating the solid mixture on a magnetic stirrer at 140 ℃ until a proper amount of liquid is melted, starting stirring, and continuing stirring for 1.5 hours at the constant temperature to obtain a liquid substance;
(3) and naturally cooling the liquid substance to room temperature to obtain a white solid, namely the organic-inorganic composite phase change energy storage material 4.
The phase change temperature range of the organic-inorganic composite phase change energy storage material 4 is 82.1 ℃, the supercooling temperature is 74.1 ℃, the step cooling curve is shown in the attached figure 4 in detail, and the enthalpy value is 163.87J/kg through the measurement of a Differential Scanning Calorimeter (DSC).
Example 5
(1) Weighing 40.15 g of erythritol, 0.35 g of anhydrous disodium hydrogen phosphate and 9.50 g of sodium acetate trihydrate into a small beaker, mixing, mashing and grinding uniformly;
(2) heating the solid mixture on a magnetic stirrer at 140 ℃ until a proper amount of liquid is melted, starting stirring, and continuing stirring for 1.5 hours at the constant temperature to obtain a liquid substance;
(3) and naturally cooling the liquid substance to room temperature to obtain a white solid, namely the organic-inorganic composite phase change energy storage material 5.
The phase change temperature of the organic-inorganic composite phase change energy storage material 5 is 79.3 ℃, the supercooling temperature is 75.8 ℃, the step cooling curve is shown in the attached figure 5 in detail, and the enthalpy value is 139.57J/g through the measurement of a Differential Scanning Calorimeter (DSC).
Example 6
(1) Weighing 41.80 g of erythritol, 0.70 g of barium hydroxide octahydrate and 7.50 g of sodium acetate trihydrate into a small beaker, mixing, mashing and grinding uniformly;
(2) heating the solid mixture on a magnetic stirrer at 140 ℃ until a proper amount of liquid is melted, starting stirring, and continuing stirring for 1.5 hours at the constant temperature to obtain a liquid substance;
(3) and naturally cooling the liquid substance to room temperature to obtain a white solid, namely the organic-inorganic composite phase change energy storage material 6.
The phase change temperature of the organic-inorganic composite phase change energy storage material 6 is 85.5 ℃, the supercooling temperature is 80.5 ℃, the step cooling curve is shown in the attached figure 6 in detail, and the enthalpy value is 238.32J/g through the measurement of a Differential Scanning Calorimeter (DSC).
Claims (3)
1. An organic-inorganic composite phase change energy storage material, which is characterized in that: the organic-inorganic composite phase change energy storage material is prepared by taking 74.25-84.00% of erythritol, 0.70-1.40% of nucleating agent and 15.00-25.00% of sodium acetate trihydrate as raw materials in percentage by mass.
2. A preparation method of an organic-inorganic composite phase change energy storage material is characterized by comprising the following steps: the method comprises the following steps:
(1) mixing erythritol, a nucleating agent and sodium acetate trihydrate, mashing and grinding uniformly;
(2) heating the solid mixture on a magnetic stirrer at 140 ℃ until a proper amount of liquid is melted, starting stirring, and continuing stirring for 1.0-1.5 h at the constant temperature to obtain a liquid substance;
(3) and naturally cooling the liquid substance to room temperature to obtain a white solid, namely the organic-inorganic composite phase change energy storage material.
3. The organic-inorganic composite phase change energy storage material and the preparation method thereof according to claims 1 and 2, characterized in that: the nucleating agent is one of anhydrous disodium hydrogen phosphate or barium hydroxide octahydrate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621350A (en) * | 2021-08-24 | 2021-11-09 | 内蒙古工业大学 | Medium-temperature phase change composite heat storage material with quality improvement and efficiency improvement functions and preparation method thereof |
| CN113845886A (en) * | 2021-09-23 | 2021-12-28 | 河北工业大学 | Intermediate-temperature phase-change heat storage material without supercooling and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621350A (en) * | 2021-08-24 | 2021-11-09 | 内蒙古工业大学 | Medium-temperature phase change composite heat storage material with quality improvement and efficiency improvement functions and preparation method thereof |
| CN113845886A (en) * | 2021-09-23 | 2021-12-28 | 河北工业大学 | Intermediate-temperature phase-change heat storage material without supercooling and preparation method thereof |
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Application publication date: 20201124 |