JPS63302274A - Chemically reactive cooling pack - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chemically reactive cooling pack in which at least two or more arbitrary chemical substances that can be used as cryogens are mixed together and a low temperature state is created by an endothermic reaction generated by the mixing.

Conventionally, chemically reactive cooling packs that mix multiple types of cryogens are already known. For example, when ammonium nitrate, an anhydrous cryogen, is mixed with water, an endothermic reaction occurs.
Although they have low temperatures, the drawback is that the cooling duration is short.
In order to extend the cooling duration, ammonium nitrate can be reacted with crystallized water such as crystalline soda carbonate having crystallized water to gradually advance an endothermic reaction, or a mixture of ammonium nitrate and urea can be mixed with water to lower the lowest cooling temperature. The cooling duration is extended by lowering the temperature as instantaneously as possible. However, when using a chemical substance containing water of crystallization, a cryogenic agent with a low melting point, such as soda carbonate with a melting point of 32°C, is used. When decahydrate salt is used as a cryogenic agent, when the temperature is high in the summer, the temperature often exceeds 32 degrees Celsius, and the cryogenic agent melts, and when the temperature drops, it recrystallizes and becomes a lump, and when used, it becomes one piece. (Many methods of integration involve tearing separated packaging bags by applying pressure from the outside.) At the same time, the reduction in surface area slows down the reaction and drastically reduces the cooling capacity. In addition, when using a mixture of ammonium nitrate and urea and water, the melting point of the mixture of ammonium nitrate and urea decreases, and it melts in the summer, reducing the initial cooling capacity. Moreover, when the temperature drops, it becomes a lump like crystalline soda carbonate.Also, cooling packs are made by storing these cryogenic agents in a storage bag and heat sealing them. Because it is solid, it is not possible to remove the air inside the storage bag sufficiently, and an air region is created at the top of the storage bag (cooling pack) when using the bag. There was a problem that the cooling of the engine deteriorated.

The present invention has been made to improve the above drawbacks,
It is now possible to use solid cryogenic agents that contain water of crystallization with a low melting point, making it easier to integrate them during use, extending the cooling duration, and adjusting the minimum cooling temperature. The purpose of this invention is to provide a chemically reactive cooling pack that can reduce as much as possible.

In order to achieve this object, the present invention creates a liquid mixed cryogen by mixing an anhydrous cryogen, a solid cryogen having water of crystallization, and a liquid substance such as oil that does not chemically react with the cryogen or is difficult to chemically react with the cryogen. If the minimum cooling temperature is to be lowered, an arbitrary amount of water can be added in addition to the two types of cryogenic agents mentioned above. The gist is to package it, store it in a storage bag, replace the air inside the storage bag with carbon dioxide gas, and heat seal it.

Embodiments of the present invention will be described below based on the accompanying drawings.

(It should be noted that the present invention is not limited to these Examples.) FIGS. 1 and 2 show Example 1. Example 2. A sectional view showing each, and FIG. 3 are cooling test results.

Next, a description will be given sequentially starting from the first embodiment.

In Example 1, ammonium nitrate was used as an anhydrous cryogen, and sodium carbonate was used as a cryogen having water of crystallization.
The cryogenic agent containing water of crystallization is mixed with an arbitrary amount of vegetable oil to form a liquid mixed cryogenic agent, and the two types of cryogenic agent are separately packaged in bags made of synthetic resin. is placed in a storage bag, the air in the storage bag is replaced with carbon dioxide gas, and the air is heat-sealed. This makes it possible to reduce the space inside the storage bag. (In Example 1, the storage bag had dimensions of 140 m x 200 mm and was made of a 15 μm nylon film laminated with a 60 μm polyethylene film containing EVA on the inner surface. In a bag, granular soda 10 hydrate salt 100
Mix well 50g of soybean oil and 50g of soybean oil. Dimensions: 75m x 155
■ A compartmentalized package (bag) made by laminating a 40 μm polyethylene film on the inner surface of a 12 μm KPET film and heat-sealing the bag is then stored, and then 200 g of ammonium nitrate is stored, and the bag is filled with carbon dioxide gas. (The air inside the bag is replaced and heat sealed.)

In Example 2, in addition to the two types of cryogenic agents used in Example 1, water was separately packaged and additionally stored in a storage bag, and the air in the storage bag was replaced with carbon dioxide gas and heat-sealed. By adding water, the dissolution rate of each cryogenic agent increases, thereby lowering the minimum cooling temperature and making it possible to perform rapid cooling. In addition to the two types of freezing agents, the size is 75mX ] 55
■、Water 100m in a bag made by laminating 40μ of polyethylene film on the inner surface of 12μ of KPETPE material.
1 was separately packaged and housed in a storage bag, replaced with carbon dioxide gas and heat-sealed as in Example 1).

The cooling test results table shown in FIG. 3 is based on examples 1 and 2 described above. and a conventional cooling pack (using the storage bag and compartmentalized packaging bag used in Example 1, 150ml of water was stored in the compartmentalized packaging bag, and it was stored in the storage bag together with 200g of ammonium nitrate, replaced with carbon dioxide gas, and heat-sealed. This is a table showing the results of each cooling test when the resulting cooling pack was measured in a constant temperature room at 32°C after tearing each divided packaging bag by hand and integrating it inside the storage bag. B shows the cooling test results of Example 1, and C shows the cooling test results of Example 2.As is clear from the above explanation, according to the present invention, the melting point It is now possible to use even solid cryogens with low crystallization water, and by making them liquid during use, it is easier to break the bag, and by mixing non-reactive liquid substances, the dissolution rate of the cryogen can be slowed down. The cooling duration can be extended, and the lowest cooling temperature can also be adjusted by supplying additional water and adjusting the dissolution rate by increasing or decreasing the volume of water.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a chemically reactive cooling pack according to Example 1 of the present invention, Figure 2 is a cross-sectional view of a chemically reactive cooling pack according to Example 2 of the present invention, and Figure 3 is a cooling test report. . 1-Anhydrous cryogenic agent, 2-Containing bag), 3-Divided packaging bag), 4-Liquid mixed chemical substance having fluidity by mixing a cryogenic agent with crystal water and oil, 5-Water, 6-Heat seal section.

Claims (5)

[Claims] (1) Chemically reactive cooling consisting of a combination of at least two or more arbitrary chemical substances that can be used as cryogens, which are packaged separately into arbitrary types and housed so that they can be integrated at the time of use. In the pack, at least one of the solid chemical substances among the above chemical substances is mixed with a liquid substance that does not chemically react or is difficult to chemically react, and is stored in an arbitrary category as a fluid liquid mixed chemical substance. A chemically reactive cooling pack characterized by: (2) Claim 1, characterized in that the combination of arbitrary chemical substances that can be used as a cryogenic agent is a liquid mixed chemical substance having fluidity consisting of a mixture of ammonium nitrate, crystalline soda carbonate, and oil. Chemically reactive cooling packs as described in Section. (3) Claims characterized in that the combination of arbitrary chemical substances that can be used as a cryogenic agent is a liquid mixed chemical substance having fluidity consisting of a mixture of ammonium nitrate, water, crystalline soda carbonate, and oil. The chemically reactive cooling pack described in item 1. (4) Claim 1, characterized in that any chemical substance that can be used as each of the cryogens described in the above items 2 and 3 is packaged separately and packaged so that they can be integrated. Chemically reactive cooling packs as described in Section. (5) Arbitrary chemical substances that can be used as each of the cryogens described in Items 2 and 3 above are packaged separately and packaged so that they can be integrated, and the air inside the package is converted to carbon dioxide. The first claim characterized in that
Chemically reactive cooling packs as described in Section.