CN111978925A - Composite phase-change material for cleaning and heating and preparation method thereof - Google Patents
Composite phase-change material for cleaning and heating and preparation method thereof Download PDFInfo
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- CN111978925A CN111978925A CN201910426359.8A CN201910426359A CN111978925A CN 111978925 A CN111978925 A CN 111978925A CN 201910426359 A CN201910426359 A CN 201910426359A CN 111978925 A CN111978925 A CN 111978925A
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- change material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to the field of phase change energy storage, and particularly provides a composite phase change material for clean heating and a preparation method thereof. The heat storage material comprises the following raw materials in percentage by mass: 70-90 parts of magnesium nitrate hexahydrate, 3-20 parts of organic acid sodium salt and 3-10 parts of nucleating agent. The composite phase change material has the advantages of small supercooling degree, large latent heat of phase change, high stability, no phase separation, simple preparation and convenience in packaging and industrial production.
Description
Technical Field
The invention belongs to the technical field of composite material heat storage, and particularly relates to a phase-change material compounded based on magnesium nitrate hexahydrate-organic acid sodium salt and a preparation method thereof.
Background
The phase-change material is a heat storage material with excellent performance, and is gradually and widely applied to the fields of aerospace thermal control, building energy conservation, automobile heat dissipation, clothing intelligent temperature regulation, power battery thermal management, medical sanitation, electronic device cooling, military camouflage and the like.
Inorganic phase change materials are various in kind, and crystalline hydrated salts are used more often. The 2 most prominent problems faced by inorganic phase change materials are supercooling and phase separation. Supercooling loses the value of the stored heat by releasing the stored latent heat in the temperature range where it is no longer needed. The phase separation enables the system to repeatedly carry out heating-cooling thermal cycle, the sediment at the bottom is more and more, so that the effective heat storage medium is less and less, and finally the heat storage capacity of the system is poorer and poorer.
The phase transition temperature of magnesium nitrate hexahydrate is 89.3 ℃, crystal water begins to be removed at 50 ℃, the magnesium nitrate hexahydrate serving as a single phase transition material has large heat of fusion, high heat conductivity coefficient, small phase transition volume and low price, but is easy to generate the phenomena of supercooling and phase separation, has the defects of corrosivity, easy leakage and the like, and limits the application of the magnesium nitrate hexahydrate.
Sodium salts of organic acids such as sodium acetate (CH 3 COONa.3H2O, SAT) belongs to a medium-low temperature phase change energy storage material, has the advantages of high melting point of 58 ℃, good thermal conductivity, no toxicity, low price, wide source and the like, but has obvious supercooling and phase separation phenomena and severely restricts the application.
In recent years, the research on the composite phase-change material is deepened, and the defect of a single material can be overcome by compounding multiple materials, so that the variety and the application range of the phase-change material are expanded.
Disclosure of Invention
The purpose of the invention can be realized by the following technical scheme:
a composite phase-change material for cleaning and heating and a preparation method thereof are prepared from the following raw materials (by weight portion): 70-90 parts of magnesium nitrate hexahydrate, 3-20 parts of organic acid sodium salt and 3-10 parts of nucleating agent.
(1) Mixing magnesium nitrate hexahydrate, organic acid sodium salt and a nucleating agent according to a certain mass ratio, grinding in a mortar, and uniformly mixing;
(2) heating the mixture obtained in the step (1) in a constant temperature bath at 80-100 ℃ until the mixture is completely melted, and performing ∙ min at 400-1000 r-1Magnetically stirring for 1-3 h to obtain a clear and transparent molten material;
(3) and cooling to room temperature to obtain the magnesium nitrate hexahydrate-organic acid sodium salt composite phase change material for cleaning and heating.
The invention has the technical advantages that:
the invention aims to provide a composite phase-change material for clean heating based on magnesium nitrate hexahydrate-organic acid sodium salt, which relieves the phenomena of phase separation and supercooling of magnesium nitrate hexahydrate to a certain extent, reduces the phase-change temperature of the material, improves the latent heat value of the material, enhances the heat storage capacity of the material, and expands the application of the material in a phase-change heat storage heating system.
Detailed Description
The technical solution of the present invention is further described in detail by the following specific examples, but the application of the present invention is not limited to the scope of the examples.
Example 1
(1) Raw materials are Mg (NO) according to mass ratio3)2·6H2O accounts for 85 parts, CH3COONa·3H210 portions of O and a nucleating agent Na2SiO3·9H2Mixing 5 parts of O, grinding in a mortar, and uniformly mixing;
(2) heating and melting the mixture obtained in the step (1) in a constant-temperature bath at 80-100 ℃, and performing heating melting at 500r ∙ min-1Magnetically stirring for 2 hours to obtain a clear and transparent molten state composite phase change material;
(3) and cooling to room temperature to obtain the magnesium nitrate hexahydrate-sodium acetate composite phase change material.
Example 2
(1) Raw materials are Mg (NO) according to mass ratio3)2·6H2O accounts for 90 parts, CH3CH2COONa·H28 portions of O and Na as a nucleating agent2SiO3·9H2Mixing 2 parts of O, grinding in a mortar, and uniformly mixing;
(2) heating and melting the mixture in the step (1) in a constant temperature bath at 90 ℃ for 800r ∙ min-1Magnetically stirring for 2.5h to obtain a clear and transparent molten state composite phase change material;
(3) and cooling to room temperature to obtain the magnesium nitrate hexahydrate-sodium propionate composite phase change material.
Example 3
(1) Raw materials are Mg (NO) according to mass ratio3)2·6H2O accounts for 85 parts, CH3COONa·3H210 portions of O and a nucleating agent Na2HPO4·12H2Mixing 5 parts of O, grinding in a mortar, and uniformly mixing;
(2) heating and melting the mixture in the step (1) in a constant temperature bath at 98 ℃ for 500r ∙ min -1Magnetically stirring for 2 hours to obtain a clear and transparent molten state composite phase change material;
(3) and cooling to room temperature to obtain the magnesium nitrate hexahydrate-sodium acetate composite phase change material.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (2)
1. The composite phase-change material for cleaning and heating and the preparation method thereof are characterized in that the magnesium nitrate hexahydrate composite phase-change material is prepared from the following raw materials (by weight): 70-90 parts of magnesium nitrate hexahydrate, 3-20 parts of organic acid sodium salt and 3-10 parts of nucleating agent.
2. The composite phase-change material for cleaning and heating and the preparation method thereof according to claim 1, wherein (1) magnesium nitrate hexahydrate, organic acid sodium salt and nucleating agent are mixed according to a certain mass ratio, and are uniformly mixed after being porphyrized in a mortar; (2) heating the mixture obtained in the step (1) in a constant temperature bath at 80-100 ℃ until the mixture is completely melted, and performing ∙ min at 400-1000 r-1Magnetically stirring for 1-3 h to obtain a clear and transparent molten material;
(3) And (3) cooling the molten material in the step (2) to room temperature to obtain the magnesium nitrate hexahydrate-organic acid sodium salt cleaning and heating composite phase change material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910426359.8A CN111978925A (en) | 2019-05-22 | 2019-05-22 | Composite phase-change material for cleaning and heating and preparation method thereof |
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| CN201910426359.8A CN111978925A (en) | 2019-05-22 | 2019-05-22 | Composite phase-change material for cleaning and heating and preparation method thereof |
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| CN111978925A true CN111978925A (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113980652A (en) * | 2021-11-05 | 2022-01-28 | 北京科技大学 | Consistent-melting composite phase-change material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113980652A (en) * | 2021-11-05 | 2022-01-28 | 北京科技大学 | Consistent-melting composite phase-change material and preparation method thereof |
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Application publication date: 20201124 |