CN110835521A - Phase change cold storage agent at-28 ℃ and preparation method thereof - Google Patents
Phase change cold storage agent at-28 ℃ and preparation method thereof Download PDFInfo
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- CN110835521A CN110835521A CN201911088911.3A CN201911088911A CN110835521A CN 110835521 A CN110835521 A CN 110835521A CN 201911088911 A CN201911088911 A CN 201911088911A CN 110835521 A CN110835521 A CN 110835521A
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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
- C09K5/066—Cooling mixtures; De-icing compositions
Abstract
The invention discloses a-28 ℃ phase change cold storage agent and a preparation method thereof, wherein the cold storage agent comprises the following components in percentage by mass: 10-15% of potassium chloride, 5-10% of sodium chloride, 8-15% of ammonium chloride, 0.2-1% of sodium carboxymethyl cellulose, 0.1-1.5% of nano-scale metal material compound A and the balance of deionized water. The crystallization temperature of the phase change coolant at minus 28 ℃ is minus 30 ℃ to minus 26 ℃, the phase change latent heat can reach 230kJ/kg, and the phase change coolant is a safe, nontoxic and low-cost phase change coolant, and can meet the refrigeration requirements of freezing medicines, meat and seafood by taking the coolant as a refrigerant.
Description
Technical Field
The invention relates to a-28 ℃ phase change cold storage agent, the crystallization temperature of which is-30 ℃ to-26 ℃. The phase change cold storage material at-28 ℃ obtained by the invention can be used in the fields of low-temperature storage, transportation and the like of various frozen foods, frozen medicines and the like.
Background
With the development of the express delivery industry and the improvement of the living standard of residents, a great amount of ice cream, frozen seafood products and the like enter thousands of households. Freeze-dried medicines are transported by pharmaceutical production, wholesale and circulation enterprises and disease control centers and need to be transported in a low-temperature state. Due to the fact that the refrigerator car is large in size, large resource waste exists when small batches of frozen goods are conveyed, and the goods need to be transported through the low-temperature phase change coolant.
The invention discloses a cold storage material composition with a crystallization temperature of-28 ℃, which is used for solving the problem of overlarge temperature of a cold storage agent due to the fact that the existing low-temperature phase change cold storage material has a large supercooling degree in the market, wherein the crystallization temperature of the cold storage agent is-30 ℃ to-26 ℃, and the cold storage agent is safe, non-toxic, low in price and convenient to manufacture.
Disclosure of Invention
In view of the defects and shortcomings in the prior art, the invention provides a-28 ℃ phase change cold storage agent, the crystallization temperature of the phase change cold storage agent is-30 ℃ to-26 ℃, the phase change latent heat can reach 230kJ/kg, and the phase change cold storage agent which is safe, non-toxic and low in cost is expected to be provided.
Specifically, the invention provides a-28 ℃ phase change coolant, which comprises the following components in percentage by mass: 10-15% of potassium chloride, 5-10% of sodium chloride, 8-15% of ammonium chloride, 0.2-1% of sodium carboxymethyl cellulose, 0.1-1.5% of nano-scale metal material compound A and the balance of deionized water.
In another preferred embodiment, the invention provides a-28 ℃ phase change coolant, which consists of the following components in percentage by mass: 10-15% of potassium chloride, 5-10% of sodium chloride, 8-15% of ammonium chloride, 0.2-1% of sodium carboxymethyl cellulose, 0.1-1.5% of nano-scale metal material compound A and the balance of deionized water.
Preferably, the nanoscale metal material composite A is a graphene/silver nanocomposite.
Preferably, the crystallization temperature of the phase change cold storage agent at the temperature of minus 28 ℃ is minus 30 ℃ to minus 26 ℃.
Preferably, the latent heat of fusion of the phase change coolant at the temperature of-28 ℃ is 230 kJ/kg-260 kJ/kg.
Preferably, the latent heat of fusion of the phase change coolant at the temperature of-28 ℃ is 230 kJ/kg.
Another object of the present invention is to provide a method for preparing a cold storage material composition at-8 ℃, comprising:
(1) weighing water by a container;
(2) starting an electric stirrer to dissolve the inorganic conjugate of claim 1 in water to obtain component a;
(3) heating the component A to 80 ℃, setting a stirrer at 1000rpm, adding the organic combination as described in claim 1 into the solution, and raising the rotation speed of the stirrer to 2500rpm, and stirring for 20 minutes to obtain the-8 ℃ cold storage material composition.
In another preferred embodiment, the invention provides a preparation method of a-28 ℃ phase change coolant, which comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound A, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase change cold storage agent at the temperature of-28 ℃.
Compared with the prior art, the invention has the technical effects that:
1. the-28 ℃ phase change cold storage agent protected by the invention is an organic and inorganic combination, has small supercooling degree as a refrigerant, and can effectively solve the problem of low freezing efficiency.
2. The phase change cold storage agent at minus 28 ℃ protected by the invention contains a nano metal composite material, and has the characteristics of fast heat conduction, stable system and small supercooling degree (plus or minus 2 ℃) at minus 28 DEG C
3. The phase change coolant at-28 ℃ protected by the invention can store cold repeatedly and has long service life.
4. The-28 ℃ phase change cold storage agent can be used for low-temperature refrigeration transportation and the like, can greatly reduce the transportation cost, and ensures the quality of transported products.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer.
The raw materials used in the examples of the present invention and the comparative examples were commercially available.
In order to achieve the purpose, the invention provides a-28 ℃ phase change coolant which mainly comprises 10-15% of potassium chloride, 5-10% of sodium chloride, 8-15% of ammonium chloride, 0.2-1% of sodium carboxymethyl cellulose, 0.1-1.5% of a nano metal material compound A and the balance of deionized water.
The phase-change material provided by the invention is subjected to crystallization temperature measurement according to a step-cooling curve method, and the latent heat of fusion of the phase-change material is measured by a DSC differential thermal method.
Example 1
Preparing raw materials according to the following mass percentages: 10% of potassium chloride, 8% of sodium chloride, 7% of ammonium chloride, 0.5% of sodium carboxymethyl cellulose, 0.4% of nano-scale metal material compound A and the balance of deionized water;
the preparation method comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound A, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase-change cold-storage liquid. The crystallization temperature of the phase-change cold-storage liquid is-28.7 ℃ and the latent heat of fusion is 248kJ/kg according to a step cold curve method.
Example 2
Preparing raw materials according to the following mass percentages: 12% of potassium chloride, 7% of sodium chloride, 9% of ammonium chloride, 0.4% of sodium carboxymethyl cellulose, 0.35% of nano-scale metal material compound A and the balance of deionized water;
the preparation method comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound A, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase-change cold-storage liquid. The crystallization temperature of the phase-change cold-storage liquid is-29.2 ℃ and the latent heat of fusion is 245kJ/kg according to a step cold curve method.
Example 3
Preparing raw materials according to the following mass percentages: 18% of potassium chloride, 6% of sodium chloride, 12% of ammonium chloride, 0.7% of sodium carboxymethyl cellulose, 0.7% of nano-scale metal material compound A and the balance of deionized water;
the preparation method comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound A, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase-change cold-storage liquid. The crystallization temperature of the phase-change cold-storage liquid is-29.5 ℃ and the latent heat of fusion is 240kJ/kg according to a step cold curve method.
Example 4
Preparing raw materials according to the following mass percentages: 14% of potassium chloride, 9% of sodium chloride, 11% of ammonium chloride, 0.6% of sodium carboxymethyl cellulose, 0.5% of nano-scale metal material composite A and the balance of deionized water;
the preparation method comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound A, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase-change cold-storage liquid. The crystallization temperature of the phase-change cold-storage liquid is-27.4 ℃ and the latent heat of fusion is 252kJ/kg according to a step cold curve method.
Example 5
Preparing raw materials according to the following mass percentages: 20% of potassium chloride, 5.5% of sodium chloride, 8.6% of ammonium chloride, 0.35% of sodium carboxymethyl cellulose, 0.65% of nano-scale metal material compound A and the balance of deionized water;
the preparation method comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound A, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase-change cold-storage liquid. The crystallization temperature of the phase-change cold-storage liquid is-26.8 ℃ and the latent heat of fusion is 256kJ/kg according to a step cold curve method.
Comparative example 1
Preparing raw materials according to the following mass percentages: 7% of potassium chloride, 9% of sodium chloride, 13% of ammonium chloride, 0.2% of sodium carboxymethyl cellulose and the balance of deionized water;
the preparation method comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, sequentially adding potassium chloride, sodium chloride and ammonium chloride, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase-change cold-storage liquid. The phase-change cold accumulation liquid is tested for crystallization temperature according to a step curve method, the crystallization speed is slow, the temperature is unstable, and the cold accumulation liquid is frozen to-45 ℃ and does not crystallize.
Comparative example 2
Preparing raw materials according to the following mass percentages: 14.5% of potassium chloride, 10% of sodium chloride, 7% of ammonium chloride, 0.8% of sodium carboxymethyl cellulose, 0.05% of nano-scale metal material compound A and the balance of deionized water;
the preparation method comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound B, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase-change cold-storage liquid. The crystallization temperature of the phase-change cold-storage liquid is tested according to a step curve method, the crystallization speed is slow, the temperature is unstable, and no determined crystallization temperature exists.
Comparative example 3
Preparing raw materials according to the following mass percentages: 5% of potassium chloride, 15% of sodium chloride, 20% of ammonium chloride, 3% of sodium carboxymethyl cellulose, 0.65% of nano-scale metal material compound B and the balance of deionized water;
the preparation method comprises the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound B, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase-change cold-storage liquid. The crystallization temperature of the phase-change cold-storage liquid is tested according to a step curve method, the crystallization speed is slow, the temperature is unstable, and no determined crystallization temperature exists.
Through the embodiments 1-5, the crystallization temperature of the cold storage material composition disclosed by the invention is-30 ℃ to-26 ℃, the material performance is relatively stable, and the latent heat of fusion is relatively large and is more than 240 kJ/kg. Comparative examples 1 to 3 show that after the proportion of each component is adjusted, the nano-scale composite metal material A is not added, the addition proportion is adjusted and replaced with another nano-scale metal composite material B which is a graphene/copper nano composite material, so that cold accumulation and cold release processes cannot be completed, and the low-temperature phase-change cold accumulation liquid with stable crystallization temperature cannot be obtained.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not intended to limit the scope of the present invention, so that all variations of the features, characteristics, steps and formula equivalent to the scope of the present invention are included in the claims of the present invention.
Claims (7)
1. The phase change cold storage agent at the temperature of-28 ℃ is characterized by comprising the following components in percentage by mass:
10-15% of potassium chloride, 5-10% of sodium chloride, 8-15% of ammonium chloride, 0.2-1% of sodium carboxymethyl cellulose, 0.1-1.5% of nano-scale metal material compound A and the balance of deionized water.
2. The phase change cold storage agent at the temperature of-28 ℃ is characterized by comprising the following components in percentage by mass: 10-15% of potassium chloride, 5-10% of sodium chloride, 8-15% of ammonium chloride, 0.2-1% of sodium carboxymethyl cellulose, 0.1-1.5% of nano-scale metal material compound A and the balance of deionized water.
3. The phase change coolant at-28 ℃ as claimed in claim 1, wherein the nano-scale metal material composite A is graphene/silver nano-composite material.
4. The phase change coolant of-28 ℃ according to claim 1, characterized in that the crystallization temperature of the phase change coolant of-28 ℃ is-30 ℃ to-26 ℃.
5. The phase change coolant at-28 ℃ as claimed in claim 1, wherein the phase change coolant at-28 ℃ has a latent heat of fusion of 230 kJ/kg-260 kJ/kg.
6. The phase change coolant for use as claimed in claim 1, wherein the phase change coolant for use at-28 ℃ has a latent heat of fusion of 230 kJ/kg.
7. A preparation method of a-28 ℃ phase change coolant is characterized by comprising the following steps:
(1) weighing deionized water by using a container;
(2) continuously stirring at 1000r/min, adding the nano-scale metal material compound A, continuously adding potassium chloride, sodium chloride and ammonium chloride in sequence, and fully dissolving;
(3) setting the rotating speed to 3500r/min, adding sodium carboxymethylcellulose, continuing stirring to fully swell the sodium carboxymethylcellulose, and keeping stirring for 1 hour to obtain the phase change cold storage agent at the temperature of-28 ℃.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111826130A (en) * | 2020-07-27 | 2020-10-27 | 安徽国微华芯环境科技有限公司 | Low-temperature phase-change cold-storage composite solvent, preparation method thereof and generating device |
| CN113667460A (en) * | 2021-09-24 | 2021-11-19 | 北京火狐星云数字科技有限公司 | Inorganic phase-change material and preparation method thereof |
| CN114316915A (en) * | 2021-12-13 | 2022-04-12 | 江苏金合能源科技有限公司 | High-latent-heat low-supercooling low-temperature inorganic phase change energy storage material and preparation method thereof |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111826130A (en) * | 2020-07-27 | 2020-10-27 | 安徽国微华芯环境科技有限公司 | Low-temperature phase-change cold-storage composite solvent, preparation method thereof and generating device |
| CN113667460A (en) * | 2021-09-24 | 2021-11-19 | 北京火狐星云数字科技有限公司 | Inorganic phase-change material and preparation method thereof |
| CN114316915A (en) * | 2021-12-13 | 2022-04-12 | 江苏金合能源科技有限公司 | High-latent-heat low-supercooling low-temperature inorganic phase change energy storage material and preparation method thereof |
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Application publication date: 20200225 |