WO2006120756A1

WO2006120756A1 - Cold-reserving material, method of cold reservation with cold-reserving material, and cooling cycle employing cold-reserving material

Info

Publication number: WO2006120756A1
Application number: PCT/JP2005/009005
Authority: WO
Inventors: Masao Umemoto
Original assignee: Toshin Life System Co., Ltd.; Sato, Shinya; Kurihara, Isao
Priority date: 2005-05-11
Filing date: 2005-05-11
Publication date: 2006-11-16

Abstract

A cold-reserving material for freezing foods which need refrigerating or freezing, such as perishable foods; and a method of refrigerating/freezing a food, etc. with the cold-reserving material. The cold-reserving material comprises water, a first electrolyte salt, and a second electrolyte salt, wherein the first electrolyte salt and the second electrolyte salt are dissolved so that the total amount of the salts is 12.5-35 wt.% per L of the water and that the ratio of the weight of the second electrolyte salt to that of the first electrolyte salt is 1:2-5.

Description

Description Cold-reserving agent, cold-retaining method using cold-retaining agent, and cooling cycle using cold-retaining agent Technical Field

The present invention relates to a cold-reserving agent for keeping refrigerated frozen foods such as fresh foods and the like, and a method for keeping foods cold using a cold-retaining agent. Background art

In general, foods grow harmful bacteria such as Escherichia coli and Salmonella over time, and fresh foods in particular tend to breed harmful bacteria. Ingestion of foods that have been propagated by harmful bacteria can cause various diseases such as food poisoning. For this reason, frozen foods are used to suppress the growth of harmful bacteria, and frozen foods are kept cold during transportation so that the freshness is maintained for a long time. In recent years, Severe Acute Respiratory Syndrome (S A R S) has become prevalent, and there is a growing interest in food hygiene.

As a method for keeping food in this way, for example, a method using dry ice is performed. However, carbon dioxide, which is a raw material for dry ice, is a causative substance for global warming, which has a problem of causing environmental problems. There was also a problem that carbon dioxide vaporized by dry ice could enter the food and alter the taste of the food itself. In addition, in air transportation, there are restrictions on loading dry ice. There was also a problem that food could not be kept cool. Disclosure of the invention

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a cold-reserving agent in place of dry ice and to provide a cold-retaining method using the cold-retaining agent. .

An object of the present invention is to provide a cryogen capable of maintaining a low temperature state for a long time. The above object of the present invention is a first electrolyte salt and an electrolyte salt different from the first electrolyte salt. A cryogen containing a second electrolyte salt, wherein the first electrolyte salt and the second electrolyte salt are dissolved so as to be 12.5 3 5% by weight in 1 L of water; and The weight ratio of the second electrolyte salt to the first electrolyte salt is 1 • 2

This is achieved by adjusting to 5.

The above-mentioned object of the present invention is that the first electrolyte salt is sodium chloride or ammonium chloride, and the second electrolyte salt is chloride U-um or ammonium chloride, or the first electrolyte salt. The salt is selected from the group consisting of magnesium chloride, calcium chloride, and sodium nitrate, and the second electrolyte salt is sodium nitrate, sodium chloride, potassium chloride, magnesium chloride, chloride It is achieved more effectively by being selected from the group consisting of the force lucivum S and ammonium chloride.

An object of the present invention is to provide a cryogen that can maintain a low temperature state for a long time. The above object of the present invention is to provide water, urea, a first electrolyte salt, and the first electrolyte salt. Is a cryogen containing a second electrolyte salt that can be mixed with a different electrolyte salt, and the total amount of the first electrolyte salt and the second electrolyte salt is 1 2 with respect to 1 L of water. 5 to 25% by weight, and the total amount ratio of the urea and the electrolyte salt composed of the first electrolyte salt and the second electrolyte salt is 1 L of water. Therefore, it can be achieved more effectively by adjusting to 1: 9 to 25. In addition, the above object of the present invention is to provide the first electrolyte salt and the second electrolyte salt from sodium chloride, magnesium chloride, calcium chloride, sodium nitrate, potassium chloride, and ammonium chloride. It is achieved more effectively by selecting from the group.

Furthermore, the present invention is also effectively achieved by dissolving magnesium chloride or calcium chloride in 1 L of water so that the concentration is 12.5 to 25% by weight.

The object of the present invention is to provide a method for freezing the inside of the cold storage by using the above-mentioned cold storage agent in a frozen state, and the above object of the present invention is to provide the frozen cold storage agent in the cold storage.

It can be effectively achieved by placing it again. In addition, the above object of the present invention can be achieved more effectively by installing the refrigerator in the side or lower part of the refrigerator, where the refrigerator is an upper door type.

Further, the above object of the present invention can be achieved more effectively by installing the cryogen so that the ratio of the volume of the cryogen to the total volume of the cool box is 0.15 or more.

The present invention freezes and stores the above-mentioned cryogen, exchanges the dissolved cryogen and the stored cryogen, and freezes the melted cryogen, so that it is more efficiently kept cool for a long time. The above-mentioned object of the present invention is to provide a method for maintaining the temperature of the cold-freezing agent in a quick freezer having a compressor of 100 W or more, and the cold-retaining agents are not in close contact with each other. Well, install the cold insulation agent, Inside the freezer, s

By setting the temperature to less than ¾πι degrees of the supercooled freezing thread outlet, the step of freezing the cryogen, and extracting the cryogen frozen in this step from the internal force of the rapid freezer and storing it in the storage In addition, it is more effective to use a cooling cycle comprising the step of putting the cryogen stored in the cold storage into the quick freezer and storing the cold storage agent stored in the storage into the cold storage. Achieved in 0 Brief Description of the Drawings

FIG. 1 is a side view showing a first embodiment of a cooling method using the cooling agent of the present invention. FIG. 2 is a side view showing a second embodiment of a cooling method using the cooling agent of the present invention. FIG. 3 is a side view showing a third embodiment of a cooling method using the cooling agent of the present invention. It is the graph which showed the temperature change of the refrigerant | coolant of this invention. Explanation of symbols

1 Cold storage

2 Coolant storage

3 Cold room

4 Storage bottom

5 Upper door BEST MODE FOR CARRYING OUT THE INVENTION

The present invention is a cryogen dissolved in water so that the total amount of the first electrolyte salt and the second electrolyte salt becomes a constant weight, and is characterized by being able to maintain a low temperature state for a long time. . Moreover, the low temperature state can be maintained for a long time by further containing urea.

The cryogen of the present invention is about 1 18 ° when sodium chloride or ammonium chloride is selected as the first electrolyte salt, and chlorinated lithium or ammonium chloride is selected as the second electrolyte salt. Foods etc. can be kept cold at temperatures below C for a long time. The first electrolyte salt and the second denatured salt are different electrolyte salts. For example, when potassium chloride is selected as the first electrolyte salt and ammonium chloride is selected as the second electrolyte salt, food or the like can be kept at a temperature of about 18 ° C. for a long time.

The first electrolyte salt is one selected from the group consisting of magnesium chloride, lucous chloride and sodium nitrate, and the second electrolyte salt is sodium nitrate and sodium chloride. By appropriately selecting from the group consisting of potassium chloride, magnesium chloride, calcium chloride and ammonium chloride, foods and the like can be kept cold at various temperatures for a long time. Here, the first electrolyte salt and the second electrolyte salt are different electrolyte salts.

For example, when magnesium chloride is selected as the first electrolyte salt and calcium chloride is selected as the second electrolyte salt, food and the like can be kept at a temperature of about −37 ° C. for a long time. In addition, sodium nitrate is selected as the first electrolyte salt and ammonium chloride is selected as the second electrolyte salt. If it can be prolonged cold food like in about a 2 9 ^'D C. The electrolyte salt described above may be used by mixing a plurality of three or more electrolyte salts.

The cryogen of the present invention is preferably dissolved so that the total amount of the first electrolyte salt and the second electrolyte salt is 12.5 to 35% by weight with respect to 1 L of water. When the total amount of the first electrolyte salt and the second electrolyte salt is less than 12.5% by weight with respect to 1 L of water, the temperature at which the food is kept cold is high, and the food can be kept sufficiently cold. become unable. On the other hand, if the total amount exceeds 35% by weight, the concentration of the first electrolyte salt and the second electrolyte salt will increase and the temperature for keeping food etc. will be lower, but it will not be possible to keep the cool temperature for a long time, Foods cannot be kept cool.

Further, the first electrolyte salt and the second electrolyte salt are dissolved so that the total amount is 12.5 to 35% by weight with respect to 1 L of water, and the second electrolyte salt and the first electrolyte salt The weight ratio is preferably adjusted to be 1: 2 to 5. If the weight ratio of the first electrolyte salt is outside the range of 2 to 5, it will not be possible to maintain the temperature at which the food is kept cold for a long time, and the food will not be sufficiently cooled.

The cryogen of the present invention may further contain urea in the first electrolyte salt and the second electrolyte salt. By containing urea, foods and the like can be kept cool at about 125 ° C., and a low-temperature state can be maintained for a long time.

For example, by adding urea to a cryogen composed of sodium chloride and potassium chloride, foods can be kept cool at around _25 ° C for a long time. . In addition, even if urea is added to a cryogen composed of sodium chloride and salt ammonium salt, 2 After 5 ° C, the food salt etc. can be kept cold for a long time.The electrolyte salt of a cryogen containing urea is sodium chloride, magnesium chloride, calcium chloride, sodium nitrate, It is preferred to select from the group consisting of chloride power and ammonium chloride. In particular, the first electrolyte salt is selected from the group consisting of sodium chloride, magnesium chloride, calcium chloride, and sodium nitrate, and the second electrolyte salt is sodium nitrate, sodium chloride. It is preferable to select from the group consisting of U-Vium, Chloride, Magnesium Chloride, Calcium Chloride and Ammonium Chloride as appropriate. Note that the first electrolyte salt and the second electrolyte salt are different electrolyte salts.

The cryogen of the present invention has a total weight ratio of 1: 9 2 to 1 L of water with respect to urea and a denatured salt composed of a first electrolyte salt and a second electrolyte.

It is preferable to dissolve so that it becomes 5. If the weight ratio of the electrolyte salt to the urea 1 is less than 9, the temperature for keeping the food, etc., cannot be maintained, and the food, etc. cannot be sufficiently cooled. If the weight ratio exceeds 25, the temperature holding time for keeping food and the like becomes longer, but it takes time to freeze the cryogen because the concentration of the electrolyte salt is high.

In addition, it is preferable to dissolve the first electrolyte salt and the second electrolyte salt so that the total weight of the first electrolyte salt and the second electrolyte salt is 12.525% by weight with respect to 1 L of water. 1 The total amount of denatured salt and second electrolytic salt is 1 L of water.

If the content is less than 2.5% by weight, the degree of refrigeration for keeping food, etc. will be high, and if the amount of food, etc. cannot be kept sufficiently, if the amount exceeds 25% by weight, the first electrolyte salt and 2 The concentration of electrolyte salt increases and foods are kept cold, but the temperature decreases. It will not be possible to hold the food for a long time and the food will not be sufficiently cooled

The cooling agent of the present invention may dissolve magnesium chloride or calcium chloride alone so as to be 12.5 to 25% with respect to 1 L of water. By adjusting the weight of magnesium chloride or calcium chloride to 12.5 to 25% by weight with respect to 1 L of water, foods etc. can be kept at around 37 ° C for a long time. The weight of magnesium chloride or calcium chloride that can be kept cold and can maintain a low temperature for a long time is 1 to 2 liters of water.

If it is less than 5% by weight, the temperature at which the food is kept cold will be high, and the food will not be kept sufficiently cold. Meanwhile, the total amount is 25 5

If the concentration exceeds sato%, the concentration of magnesium chloride or calcium chloride will increase and the temperature at which food will be kept cooler will become lower, but it will not be possible to maintain that temperature for a long period of time, and it will be possible to keep food sufficiently. I can't make it.

It is preferable that the above-described cryogen of the present invention is used by filling the laminating film or container with the cryogen. Examples of the material for the container filled with the cryogen of the present invention include various known materials composed of polyethylene, polyester, polypropylene, vinyl chloride, and other materials that can withstand low temperatures. Consists of configured containers.

Moreover, you may mix | blend well-known various additives, such as a thickener and a freezing point depressant, with the cold insulating agent of this invention as needed.

Next, a cooling method using the cooling agent of the present invention will be described in detail.

FIG. 1 shows a first embodiment of a cooling method using the cooling agent of the present invention. It is a side view of a cold storage with a door on the side. The cold storage 1 includes a cold storage container 2 for storing a cold storage agent, and a cold storage room 3 for storing and storing food or the like that is stored by the cold storage agent.

2 and the cold room 3 are partitioned by a storage bottom 4.

In general, cold air has the property of moving from the upper part to the lower part. Therefore, it is preferable to install the cold insulation storage part 2 in the upper part of the cold storage room 3, so that it is stored and stored in the cold storage room 3. Efficient food can be kept cool. Although not shown, depending on the usage, etc., the cryogen storage part 2 may be placed on the lower part of the side surface in the cool box 1 or a plurality of the cryogen storage parts 2 may be installed. In addition, the storage unit bottom 4 may be omitted as necessary. Although not shown, the cold insulation storage unit 2 may be installed on the door.

It is preferable to install the cooling agent so that the amount of the cooling agent stored in the cooling agent storage part 2 (shellfish) is 0.15 or more of the total volume of the cold storage 1. If the body temperature of the refrigerated shell is set to 0 • 15 or more, food stored in the cool room 3 can be kept cold for a long time. It should be noted that the volume of the cooling agent is not less than 0.25 with respect to the entire volume of the cool box 1 when maintaining for a long time in a low temperature state (_ 20 ° C) as an alternative to the door and the fuse. It is preferable to install a cooling agent in

The container bottom 4 is not particularly limited in material and shape as long as it can withstand the weight of the cooling agent, but in order to efficiently move the cold air from the cooling agent to the cooling chamber 3, for example, a mesh or the like It is preferable that the shape has a gap.

FIG. 2 shows a second embodiment of a cold insulation method using the cold insulation agent of the present invention. It is a side view of a cool box with a door on the top of the cool box (upper method). The cool box 1 is connected to the upper door 5 and the cool box

1 includes a cooling agent storage unit for storing the cooling agent installed at the bottom.

2 and a cold storage chamber 3 for storing and storing food or the like to be kept cold by the cold storage agent. The cold storage chamber 2 and the cold storage chamber 3 are partitioned by the storage portion bottom 4.

Set the cold storage agent so that the total volume of the cold storage container 1 is 0 • 15 or more with respect to the total volume of the cold storage chamber 1. By setting the body temperature of the refrigeration shellfish which is preferable to 0.15 or more, food stored in the cold storage chamber 3 can be kept cold for a long time. In addition, when maintaining for a long time in a low temperature state (120 ° C) as an alternative to the ice cream, the volume of the cooling agent should be 0 25 or more with respect to the total volume of the refrigerator 1. It is preferable to install a cooling agent in

In addition, as shown in FIG. 3, the cryogen storage part 2 may be installed on the side surface of the cool box 1. The cryogen storage unit 2 and the cold storage chamber 3 are separated by a storage unit wall 6. Depending on the purpose of use, it may be possible to place the cryogen storage part 2 on both the side and the bottom of the cool box 1, but the cryogen storage part 2 should be installed on the door (not shown). May be. Further, the storage unit bottom 4 in FIG. 2 and the storage unit wall 6 in FIG. 3 may be omitted as required.

In the present invention, the cryogen is stored in the cryogen storage unit 2,

0 Freeze another cryogen while keeping it cool, move the cryogen to the storage, and store it. When the cooling efficiency of the cooling agent stored in the cooling agent storage unit 2 is lost, or when you want to keep the inside of the cooling chamber 3 again, replace it with the cooling agent stored in the storage. By performing such a cold-retaining cycle, food and the like can be efficiently cooled.

First, put the cryogen in a quick freezer with a compressor of 100 W or more. If it is a quick freezer having a compressor of 100 W or more, the shape, size, etc. are not limited, and a known one can be used. The cryogen of the present invention depends on the first electrolyte salt and the second electrolyte salt to be used. However, in order to keep foods etc. at a temperature of about 115 ° C. or less, the temperature of the cryopreservant is not less than 100 W If you don't cool by putting a cryogen in a quick freezer with a compressor, it will take a long time to freeze the cryogen, and in some cases it won't freeze.

In addition, it is preferable to set the temperature in the quick freezer (internal temperature) to be equal to or lower than the supercooling freezing temperature of the first electrolyte salt and the second electrolyte salt. Since the cold-reserving agent of the present invention keeps food at about 15 ° C. or less, it takes a long time to freeze the cold-reserving agent unless the inside temperature is lower than the supercooling freezing temperature. In some cases, it may not freeze. The supercooling freezing temperature varies depending on the first electrolyte salt and the second electrolyte salt described above, but is around 140 ° C.

In addition, it is preferable to install a cryogen so that the cryogen does not adhere to each other when it is placed in the quick freezer. When installed in close contact with the cryogen, the contact area (surface area) between the cryogen and the air inside the quick freezer is reduced, effectively freezing the cryogen.

1 I can't do it.

In the method of freezing the cryogen, the method is not particularly limited as long as it can be installed so that the cryogens do not adhere to each other. For example, a partition may be provided between the cryogen and other cryogens. In addition, a container having a form that naturally creates a gap when stacked may be filled with a cooling agent and frozen.

Move frozen cryogen to storage and store. In addition, when the frozen cryogen is moved to the storage, the frozen cryogen can be provided efficiently by placing the dissolved cryogen in the quick freezer.

If you want to keep the inside of the cool room 3 cold, or if the cold pack stored in the cold pack storage unit 2 has dissolved and can no longer maintain the low temperature, replace it with the cool pack stored in the storage. Dissolve the cryogen in a quick freezer and store it in the storage. If the replaced cryogen is dissolved, replace it again. Place the dissolved cryogen in a quick freezer and freeze it. If the cryogen freezes, move it to the storage and store it, and take out the cryogen from the storage and use it when necessary.

Since this cool cycle does not use dry ice, it can be maintained at a low temperature and at a low temperature without causing environmental problems.

Although the present invention has been described in detail above, the present invention is not limited to these. For convenience of explanation, the case where food is kept cold using the cryogen of the present invention has been described. However, in addition to food, it can also be used for medical devices such as blood that needs to be kept cold.

2 Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. Example 1

The cold-reserving agent of the present invention was put into the cold-reserving agent storage part 2 as shown in FIG. 1, and the temperature change in the cold-reserving chamber 3 was measured for 12 hours.

The cryogenic agent comprising water, magnesium chloride and calcium chloride (hereinafter referred to as Sample 1), the cryogen comprising water, sodium nitrate and ammonium chloride (hereinafter referred to as Sample 2). ), A cryogen composed of water, sodium chloride, potassium chloride and urea (hereinafter referred to as Sample 3), a cryogen composed of water, sodium chloride, ammonium chloride and urea (hereinafter referred to as Sample 3). Sample 4) and a cryogen composed of water, ammonium chloride and potassium chloride (hereinafter referred to as Sample 5) were prepared as follows.

Sample 1 was prepared by dissolving 1 88 g of magnesium chloride and 62 g of calcium chloride in 1 L of water and filling a polyethylene container. Thereafter, Sample 1 was frozen in a 100 W rapid refrigerator.

Sample 2 was prepared by dissolving 375 g of nitric acid U-vum and 1300 g of ammonium chloride in 1 L of water and filling it into a volume made of ¾ ヽ U-ethylene. 2 was frozen in a 1 00 0 0 W fast refrigerator

Sample 3 was prepared by dissolving 2 67 7 g of sodium chloride U, 6 6 g of chloride chloride and 35 g of urea in 1 L of water and filling a polyethylene container. Sample 3 was then frozen in a 100 0 W rapid refrigerator.

Sample 4 is 1 liter of water with 2 67 7 g of sodium chloride U um and chloride.

Three 66 g of ammonium and 17 g of urea were dissolved and filled in a polyethylene container. Sample 4 was then frozen in a 100 0 W rapid refrigerator.

Sample 5 was prepared by dissolving 2 67 g of ammonium chloride and 6 7 g of potassium chloride in 1 L of water and filling it in a polyethylene container. Sample 5 was then frozen in a 100 W rapid refrigerator.

In addition, a temperature change was measured in the same manner as Samples 1 to 5, using a commercially available cryopreservant based on sodium polyacrylate as a main component. The results are shown in Fig. 4.

As can be seen from Fig. 4, Samples 1 to 5 of the present invention kept the inside of the refrigerator 1 for a long time compared to the commercially available cryogen (comparative sample) even after a lapse of 12 tons. I knew I could do it. Further, from FIG. 4, it was found that Samples 1 to 5 of the present invention can maintain a constant temperature for a long time as compared with the conventional cryogen. Example 2

In order to maintain a temperature of 118 ° C. or less, which is an international refrigeration transport standard, for a long period of time, it was tested how much the cryogen of the present invention is necessary for the total volume of the refrigerator 1.

Place the sample 1 (550 ml X 16) prepared in Example 1 in the cooler 1 of the upper door type as shown in (1) to (4) below, and measure the holding time. did.

(1) In the lower part of the cool box 1, two (a total of 16) of 8 samples 1 were installed.

(2) Sixteen samples 1 were installed at regular intervals on the entire lower surface of the cool box 1.

Four (3) Four samples 1 were installed in the lower part of the cool box 1 and 12 samples were installed on the side.

(4) Two samples 1 were installed on the side of the cool box 1 and four were installed on the upper door. In addition, in (1) to (4), the volume of the cryogen / the volume of the cool box 1 was 0.20.

As a result of measuring the temperature in the refrigerator 1 for (1) to (4), the retention time is (1) is 400 minutes, (2) is 500 minutes, (3) is 60 minutes And (4) became 600 minutes.

Next, the volume of the cold-reserving agent z The volume of the cold-reservoir 1 was 0.14 D 試験 When the same method as (3) above was tested, the retention time was 3 5

It was 0 minutes, and it was not possible to obtain a holding time for sufficient cooling.

Example 3

In order to maintain a low-temperature state (120 ° C.) as an alternative to the rice for a long time, it was tested how much the cold-reserving agent of the present invention was necessary with respect to the total volume of the cold-reservoir 1.

The sample 2 prepared in Example 1 is placed in the lower part of the cold storage box 1 having a volume of 45 L, and the volume of the cooling agent / the volume of the cold storage box 1 is 0.14,.

The number of times of cold storage 1 J was increased so that the temperature was 1 8 and 0.25. In addition, if the dry ice 4 kg is placed in the lower part of the refrigerator 1 under the same conditions,

The time for holding below 0 ° c was also measured.

The measurement results were 7 hours for 0.14, 10 hours for 0.18, and 15 hours for 0.25. On the other hand, in the case of dry ice, the temperature was kept below −20 ° C for 15 hours. Therefore, When the present invention is used as a substitute for dry ice, the volume of the cryogen / the volume of the cool box 1 should be at least 0.25 (more than 2.5 times the weight of the dry ice). The effect of the invention

By using a cryogen in which two different electrolyte salts are mixed with water of the present invention at a constant weight ratio, it is an international freezing transport standard.

1 Low temperature below 8 ° C can be maintained for a long time. As a result, foods can be kept cold for a long time, and harmful bacteria are less likely to propagate in foods. In addition, the cold insulation temperature can be adjusted by appropriately changing the electrolyte salt according to the purpose of use, or by further adding urea, so that the cold insulation of the present invention can be adjusted. According to the agent, do not use dry ice 1

<However, it is now possible to keep food sufficiently cold during air transportation. Industrial applicability

Using the cryogen of the present invention, it is an international refrigeration transport standard ― 1

It has become possible to hold a low temperature of 8 C or less for a long time o To be able to keep food etc. cold for a long time 7

It will be possible to transport over long distances while maintaining the freshness of PP. It can also be used to transport medical devices such as blood that need to be kept cold. In addition, by using the cryogen of the present invention, it is possible to keep food and the like cold without using dry ice, and it can be used industrially as a substitute for dry ice. It becomes.

Claims

The scope of the claims

1. A cold insulator containing water, a first electrolyte salt, and a second electrolyte salt that is an electrolyte salt different from the first electrolyte salt, wherein the first electrolyte salt and the second electrolyte salt The total amount is 12.5 to 35% by weight with respect to 1 L of water, and the weight ratio of the second electrolyte salt to the first electrolyte salt is. A cryogen that is adjusted to be 5.

2. The cold insulation according to claim 1, wherein the first electrolyte salt is sodium chloride or ammonium chloride, and the second electrolyte salt is potassium chloride or ammonium chloride. Agent.

3. The first electrolyte salt is selected from the group consisting of magnesium chloride, calcium chloride, and sodium nitrate, and the second electrolyte salt is sodium nitrate, sodium chloride, 2. The cryogen according to claim 1 selected from the group consisting of calcium chloride, magnesium chloride, calcium chloride and ammonium chloride.

4. A cold insulator containing water, urea, a first electrolyte salt, and a second electrolyte salt that is an electrolyte salt different from the first electrolyte salt, wherein the first electrolyte salt and the second electrolyte salt The total amount of the electrolyte salt is 12.5 to 25% by weight with respect to 1 L of the water, and the urea, the first electrolyte salt, and the second electrolyte salt are dissolved. The total amount ratio with the electrolyte salt is adjusted to be 1: 9 to 25 with respect to 1 L of the water.

7

5. The first electrolyte salt and the second electrolyte salt are selected from the group consisting of sodium chloride, magnesium chloride, calcium chloride, sodium nitrate, potassium chloride, and ammonium chloride. The cold-retaining agent according to claim 4.

6. Magnesium chloride or calcium chloride against 1 L of water,

A cryogen characterized by being dissolved to 1 to 2.5 to 25% by weight.

7. A cold insulation method using a cold insulation agent, wherein the cold insulation agent according to claim 1 is frozen, and the frozen refrigerant is installed in a cold storage.

8. A cold insulation method using a cold insulation agent, wherein the cold insulation chamber according to claim 7 is an upper door type, and the frozen cold insulation agent is installed on a side surface or a lower part of the cold insulation chamber.

9. A cold insulation method using a cryogen, wherein the cryogen according to claim 4 is frozen, and the frozen cryogen is placed in a cool box.

10. The cold insulation method using a cold insulation agent, wherein the cold insulation chamber according to claim 9 is an upper door type, and the frozen cold insulation agent is disposed on a side surface or a lower portion of the cold insulation chamber.

1 1. Freeze the cryogen according to claim 6 and freeze A cooling method using a cooling agent, which is characterized in that the stored cooling agent is placed in a refrigerator.

1 2. The cold insulation method using the cold insulation agent, wherein the cold insulation chamber according to claim 1 1 is an upper door type, and the frozen cold insulation agent is installed on a side surface or a lower portion of the cold insulation cabinet.

1 3. The cold insulation using the cold insulation agent according to claim 7, wherein the cold insulation agent is installed so that the ratio of the volume of the cold insulation agent is 0.15 or more with respect to the total volume of the cold insulation box. Method.

14. The cold insulation using the cold insulation agent according to claim 8, wherein the cold insulation agent is installed such that a volume ratio of the cold insulation agent is 0.15 or more with respect to a total volume of the cold insulation box. Method.

15. The cold insulation using the cold insulation agent according to claim 9, wherein the cold insulation agent is installed such that the ratio of the volume of the cold insulation agent is 0.15 or more with respect to the total volume of the cold insulation box. Method.

16. The cold insulating agent according to claim 10, wherein the cold insulating agent is installed so that a ratio of the volume of the cold insulating agent is 0.15 or more with respect to the total volume of the cold storage cabinet. Cooling method.

1 7. The cold-retaining agent according to claim 11 is used, wherein the cold-retaining agent is installed such that a volume ratio of the cold-retaining agent is 0.15 or more with respect to a total volume of the cold-reservoir. Cooling method.

9

1 8. The cold insulation according to claim 1 or 2, wherein the cold insulation agent is added so that the ratio of the volume of the cold insulation agent B is 0.15 or more with respect to the total volume of the cold storage room. T Cooling method.

1 9. Place the cryogen described in claim 1 in a quick freezer having a compressor of 100 W or more, so that the m β self-cooling agent does not adhere. Installed 刖記 Έ? Then, set the temperature inside the quick freezer below the supercooling freezing temperature to freeze the above-mentioned cryogen, and B'J i∑j Take out from the quick freezer and store it in the storage, and put the dissolved cryogen in the quick freezer, and then put the cryogen stored in your storage in the refrigerator. A cooling cycle characterized by

2 0. Place the cryogen according to claim 4 in a quick freezer having a compressor of 100 W or more, and install the cryogen so that the cryogens do not adhere to each other. Τί, the step of freezing the cryogen by setting it below the supercooling freezing temperature in the quick freezer, and whether the cryogen frozen in this step is in the fast freezer The cooling cycle is characterized in that it comprises the steps of putting the stored cryogen into the quick freezer and storing it in the freezer, and storing the cryogen stored in the cooler. .

2 1. Apply the cooling agent according to claim 6 to a pressure of 10 0 0 0 W or more. By placing it in a quick freezer with a compressor, installing the cryogen so that the cryogens do not adhere to each other, and setting the internal temperature of the quick freezer below the supercooling freezing temperature The step of freezing the cryogen, the cryogen frozen in the step is taken out of the rapid freezer and stored in the storage, and the dissolved cryogen is put into the quick freezer. A cooling cycle comprising: a step of putting the cryogen stored in the storage into the cold storage.