CN114806509A - Cold storage phase change cold storage material and preparation method thereof - Google Patents
Cold storage phase change cold storage material and preparation method thereof Download PDFInfo
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- CN114806509A CN114806509A CN202111589525.XA CN202111589525A CN114806509A CN 114806509 A CN114806509 A CN 114806509A CN 202111589525 A CN202111589525 A CN 202111589525A CN 114806509 A CN114806509 A CN 114806509A
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Abstract
The invention discloses a refrigerated phase-change cold storage material and a preparation method thereof, and belongs to the technical field of phase-change energy storage. The phase-change material comprises a phase-change component and an additive, wherein the phase-change component comprises 66.15-76.55 parts by mass of an energy storage agent, 13.4-17.2 parts by mass of an organic temperature regulator and 8.85-13.05 parts by mass of an inorganic temperature regulator, and the additive comprises 0.5-2.0 parts by mass of a nucleating agent, 0.5-1 part by mass of a thermal conductivity enhancer, 0.1-0.3 part by mass of a thickening agent and 0.1-0.3 part by mass of distilled water; the phase change temperature of the sodium sulfate decahydrate is adjusted after the multiple temperature regulators are compounded, the phase change temperature of the obtained material is 1.2-3.0 ℃, the phase change latent heat is 124-158 kJ/kg, and the heat conductivity coefficient is more than 0.7W/m.k.
Description
Technical Field
The invention belongs to the technical field of phase change energy storage, and particularly relates to a refrigerated phase change cold storage material and a preparation method thereof.
Background
In recent years, with the continuous development of economy in China, a cold chain is developed vigorously as a new industry, and with the development of cold chain logistics, phase change materials are widely applied to aspects of food cold chain transportation, medicine cold chain logistics and the like. By utilizing the phase-change cold accumulation principle, cold accumulation materials with different phase-change temperatures are reasonably configured according to different temperature requirements of cold chain transportation, so that the specific requirements of cold chain logistics can be met, and the problems that the traditional mechanical refrigeration is large in energy consumption, difficult to monitor, easy to be influenced by force factors and the like can be solved by the phase-change materials.
At present, phase change materials which are applied to food and medicine refrigeration and are not aqueous phase systems are mainly partial alkanes, non-alkanes and mixtures of the partial alkanes and the non-alkanes, and although the supercooling phenomenon of the materials is mild, the practical application effect of the materials is limited by the problems of small heat conductivity coefficient, high price, pollution to environment and water, easy seepage from the surface of a packaging material and the like.
Disclosure of Invention
The invention provides a refrigerated phase-change cold storage material and a preparation method thereof, and the composite phase-change material for refrigeration at the temperature of 1.2-3.0 ℃ is prepared, and has the advantages of high heat conductivity coefficient, low price, environmental friendliness and easiness in packaging.
In order to achieve the above purpose, the invention adopts the following technical scheme: a cold storage phase change cold storage material for refrigeration comprises a phase change component and an additive, wherein the phase change component comprises 66.15-76.55 parts by mass of an energy storage agent, 13.4-17.2 parts by mass of an organic temperature regulator and 8.85-13.05 parts by mass of an inorganic temperature regulator, and the additive comprises 0.5-2.0 parts by mass of a nucleating agent, 0.5-1 part by mass of a heat conduction enhancer, 0.1-0.3 part by mass of a thickening agent and 0.1-0.3 part by mass of distilled water.
In the components, the energy storage agent is sodium sulfate decahydrate, the organic temperature regulator is sodium formate, and the inorganic temperature regulator consists of 2.85-5.55 parts by mass of sodium chloride and 6-7.5 parts by mass of sodium bromide; the nucleating agent is sodium tetraborate, the heat conduction reinforcing agent is graphite, and the thickening agent is sodium polyacrylate.
A preparation method of a refrigerated phase-change cold storage material comprises the following steps:
(1) melting the energy storage agent at a constant temperature of 40-45 ℃; adding an organic temperature regulator after the energy storage agent is completely melted, and stirring for dissolving;
(2) adding an inorganic temperature regulator into the dispersion liquid obtained in the step (1), and stirring for dissolving;
(3) adding a nucleating agent into the dispersion liquid obtained in the step (2) and continuously stirring;
(4) adding a heat conduction reinforcing agent and distilled water into the dispersion liquid obtained in the step (3) and continuously stirring;
(5) and (4) stopping constant-temperature heating, cooling to room temperature, adding a thickening agent into the dispersion liquid obtained in the step (4), and continuously stirring to obtain the phase-change material.
The stirring speed of the steps (1) and (2) is 100-300rpm, and the stirring time is 1-5 min; the organic temperature regulator is preferably added to be beneficial to the stability of the system;
the stirring speed of the step (3) and the step (4) is 6000-;
the nucleating agent in the step (3) needs to be dispersed for a longer time, and the method is beneficial to the stability of a subsequent system, so the nucleating agent is preferentially added;
the distilled water added in the step (4) can supplement part of crystal water lost by the sodium sulfate decahydrate in the melting process, and can properly improve the latent heat of phase change of the system.
And (5) continuously stirring at 300rpm of 100 before the dispersion liquid is cooled to the room temperature, adding the sodium polyacrylate, and then stirring for 1-5min at the stirring speed of 50-100 rpm.
The invention has the beneficial effects that: the phase change temperature of the sodium sulfate decahydrate is adjusted after the three temperature regulators are compounded, so that the composite phase change material for refrigeration is invented, the phase change temperature of the material is 1.2-3.0 ℃, the phase change latent heat is 124-158 kJ/kg, the heat conductivity coefficient is more than 0.7W/m.k, the composite phase change material is not easy to shake in the use process, a good suspension environment is created for particle components, and the composite phase change material is good in heat conductivity, free of phase separation and high in density; the phase-change material in the invention has the advantages of low price, environmental protection, easy encapsulation, no pollution to water and environment, and wide application prospect in refrigeration and transportation of food and medical products.
Drawings
FIG. 1 is a DSC chart of the cold storage material obtained in example 1;
fig. 2 is a DSC chart of the cold storage material obtained in example 2.
Detailed Description
The invention is described in detail below with reference to the following figures and specific embodiments:
example 1
A preparation method of a refrigerated phase-change cold storage material comprises the following steps:
(1) 71.74 parts of sodium sulfate decahydrate are placed in a beaker, and the whole is put in a constant-temperature water bath at 45 ℃ for melting;
(2) adding 15.2 parts of sodium formate into completely melted sodium sulfate decahydrate, and starting stirring at 300rpm for 5 min;
(3) adding 3.8 parts of sodium chloride into the dispersion liquid in the step (2), and continuing stirring at 300rpm for 5 min;
(4) adding 6.65 parts of sodium bromide into the dispersion liquid in the step (3), and continuing stirring at 200rpm for 5 min;
(5) adding 1.19 parts of sodium tetraborate into the dispersion liquid in the step (4), and continuing stirring at 8000rpm for 30 min;
(6) adding 0.89 part of graphite into the dispersion liquid in the step (5), and continuing stirring at 8000rpm for 30 min;
(7) adding 0.23 part of distilled water into the dispersion liquid obtained in the step (6), and continuously stirring for 8 min;
(8) and (4) stopping constant temperature heating, cooling to room temperature, adding 0.3 part of sodium polyacrylate into the dispersion liquid obtained in the step (7), and continuously stirring at 60rpm for 5min to finally obtain the phase-change material.
As shown in the DSC chart of the phase change material obtained in the embodiment of FIG. 1, the phase change point of the material is 1.35 ℃, and the enthalpy of phase change is 157.424 kJ/kg; after the phase-change material is completely solidified, an obvious melting phase-change platform appears when the phase-change material is melted at room temperature, and the temperature of the melting platform is 1.35-3.0 ℃.
Example 2
A preparation method of a refrigerated phase-change cold storage material comprises the following steps:
(1) putting 70.65 parts of sodium sulfate decahydrate into a beaker, and putting the whole into a constant-temperature water bath at 45 ℃ for melting;
(2) adding 15.6 parts of sodium formate into completely melted sodium sulfate decahydrate, and starting stirring at 300rpm for 5 min;
(3) adding 3.5 parts of sodium chloride into the dispersion liquid in the step (2), and continuously stirring at 300rpm for 5 min;
(4) adding 7.0 parts of sodium bromide into the dispersion liquid in the step (3), and continuing stirring at 200rpm for 5 min;
(5) adding 2.0 parts of sodium tetraborate into the dispersion liquid in the step (4), and continuing stirring at 8000rpm for 50 min;
(6) adding 0.7 part of graphite into the dispersion liquid obtained in the step (5), and continuously stirring at 8000rpm for 20 min;
(7) adding 0.3 part of distilled water into the dispersion liquid obtained in the step (6), and continuously stirring for 10 min;
(8) and (4) stopping constant temperature heating, cooling to room temperature, adding 0.25 part of sodium polyacrylate into the dispersion liquid obtained in the step (7), and continuously stirring at 50rpm for 5min to finally obtain the phase-change material.
As shown in the DSC test chart of the phase change material obtained in the embodiment shown in FIG. 2, it can be seen that the phase change point of the material is 1.201 ℃, and the enthalpy of phase change is 155.427 kJ/kg.
Example 3
A preparation method of a refrigerated phase-change cold storage material comprises the following steps:
(1) putting 70.5 parts of sodium sulfate decahydrate into a beaker, and putting the whole into a constant-temperature water bath at 45 ℃ for melting;
(2) adding 16.3 parts of sodium formate into completely melted sodium sulfate decahydrate, and starting stirring at 300rpm for 5 min;
(3) adding 4 parts of sodium chloride into the dispersion liquid in the step (2), and continuously stirring at 300rpm for 5 min;
(4) adding 6 parts of sodium bromide into the dispersion liquid obtained in the step (3), and continuously stirring at 200rpm for 5 min;
(5) adding 1.0 part of sodium tetraborate into the dispersion liquid in the step (4), and continuing stirring at 8000rpm for 40 min;
(6) adding 0.9 part of graphite into the dispersion liquid in the step (5), and continuing stirring at 8000rpm for 50 min;
(7) adding 1 part of distilled water into the dispersion liquid obtained in the step (6), and continuously stirring for 10 min;
(8) and (4) stopping constant temperature heating, cooling to room temperature, adding 0.3 part of sodium polyacrylate into the dispersion liquid obtained in the step (7), and continuously stirring at 50rpm for 5min to finally obtain the phase-change material.
The phase transition point of the material obtained in the example is 1.527 ℃, and the phase transition enthalpy is 124.579 kJ/kg.
Comparative example 1
Comparative example 1 is a refrigerated phase change material used in a medical incubator of a certain cold chain transportation enterprise, the phase change material comprises n-tetradecane, and the heat conductivity coefficients of the phase change material of the comparative example 1 and the phase change materials of the examples 1 to 3 are compared as follows:
TABLE 1 comparison of heat-conducting Properties
| Name (R) | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| Coefficient of thermal conductivity (W/mk) | 0.85 | 0.80 | 0.85 | 0.26 |
| Density (g/cm) 3 ) | 1.68 | 1.679 | 1.67 | 0.767 |
The phase-change material obtained by the material in the comparative example 1 and the phase-change material obtained in the embodiment 1 are filled into the same cold storage plate, and charge and discharge cold circulation is carried out, the phase-change material is subjected to solidification-melting, and the surface condition of the cold storage plate is observed, so that the surface condition of the cold storage plate packaged with the material in the comparative example 1 before freezing and after melting is known, the surface of the cold storage plate packaged with the material in the comparative example 1 has liquid exudation after the solidification-melting circulation, and the surface of the cold storage plate packaged with the material in the embodiment 1 is not changed before and after the circulation, which also fully shows that the phase-change material in the invention has high adaptability to the packaging material, is easier to package compared with the ratio, and reduces the possibility of pollution to transported goods caused by exudation of the phase-change material.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The cold storage material is characterized by comprising a phase change component and an additive, wherein the phase change component comprises 66.15-76.55 parts by mass of an energy storage agent, 13.4-17.2 parts by mass of an organic temperature regulator and 8.85-13.05 parts by mass of an inorganic temperature regulator, and the additive comprises 0.5-2.0 parts by mass of a nucleating agent, 0.5-1 part by mass of a heat conduction enhancer, 0.1-0.3 part by mass of a thickening agent and 0.1-0.3 part by mass of distilled water.
2. A chilled phase change cold storage material according to claim 1, wherein the energy storage agent is sodium sulfate decahydrate, the organic temperature regulator is sodium formate, the nucleating agent is sodium tetraborate, the thermal conductivity enhancer is graphite, and the thickening agent is sodium polyacrylate.
3. A cold storage phase change cold storage material according to claim 1 or 2, wherein the inorganic temperature regulator comprises 2.85-5.55 parts by mass of sodium chloride and 6-7.5 parts by mass of sodium bromide.
4. The preparation method of the refrigerated phase-change cold storage material is characterized by comprising the following steps of:
melting the energy storage agent at a constant temperature of 40-45 ℃; adding an organic temperature regulator after the energy storage agent is completely melted, and stirring for dissolving;
adding an inorganic temperature regulator into the dispersion liquid obtained in the step (1), and stirring and dissolving;
adding a nucleating agent into the dispersion liquid obtained in the step (2) and continuously stirring;
adding a heat conduction reinforcing agent and distilled water into the dispersion liquid obtained in the step (3) and continuously stirring;
and (4) stopping constant-temperature heating, cooling to room temperature, adding a thickening agent into the dispersion liquid obtained in the step (4), and continuously stirring to obtain the phase-change material.
5. The method for preparing a cold storage phase-change cold storage material for refrigeration as claimed in claim 4, wherein the stirring speed in the steps (1) and (2) is 100-300rpm, and the stirring time is 1-5 min.
6. The method for preparing a phase change cold storage material for refrigeration as claimed in claim 4, wherein the stirring speed in the steps (3) and (4) is 6000-.
7. A method for preparing a cold-storage phase-change cold-storage material for refrigeration as claimed in claim 4 or 6, wherein the nucleating agent is added preferentially to the other components of the additive for a longer period of time.
8. The method for preparing a phase change cold storage material for refrigeration as claimed in claim 4, wherein the stirring is continued at 100-300rpm before the temperature of the dispersion liquid is reduced to room temperature in the step (5).
9. A method for preparing a cold storage phase change cold storage material for refrigeration as claimed in claim 4, wherein the stirring speed is 50-100rpm after the sodium polyacrylate is added in the step (5), and the stirring time is 1-5 min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000178544A (en) * | 1998-12-17 | 2000-06-27 | Mitsubishi Cable Ind Ltd | Cold storage material utilizing latent heat |
| CN102660231A (en) * | 2012-04-17 | 2012-09-12 | 武汉大学 | Inorganic phase-change material and preparation method thereof |
| CN105154025A (en) * | 2015-10-26 | 2015-12-16 | 中国科学院青海盐湖研究所 | Inorganic phase change energy storage material and preparation method thereof |
| CN108884380A (en) * | 2016-03-23 | 2018-11-23 | 株式会社钟化 | Heat-storing material composition and its application |
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- 2021-12-23 CN CN202111589525.XA patent/CN114806509A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000178544A (en) * | 1998-12-17 | 2000-06-27 | Mitsubishi Cable Ind Ltd | Cold storage material utilizing latent heat |
| CN102660231A (en) * | 2012-04-17 | 2012-09-12 | 武汉大学 | Inorganic phase-change material and preparation method thereof |
| CN105154025A (en) * | 2015-10-26 | 2015-12-16 | 中国科学院青海盐湖研究所 | Inorganic phase change energy storage material and preparation method thereof |
| CN108884380A (en) * | 2016-03-23 | 2018-11-23 | 株式会社钟化 | Heat-storing material composition and its application |
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