JPH02166376A - Method for providing cold heat source - Google Patents

Abstract

PURPOSE:To extend cold insulation time sharply by providing two hydrate bags to contain a hydrate agent, and an endothermic bag to contain an endothermic agent, putting the hydrate agent contained in a first hydrate bag into the endothermic bag to cause endothermic reaction and hence lowering the temperature of the endothermic bag, and further lowering the temperature of the endothermic bag with the hydrate agent contained in a second hydrate bag. CONSTITUTION:Hydrate bags 12A and 12B contain a hydrate agent 17 while an endothermic agent 18, which is mixed with the hydrate agent 17 to cause endothermic reaction, and a polymeric water absorption agent 19 are contained in an endothemric agent 13. A cap 15a of the first hydrate bag 12A and a cap 15c of the endothermic bag 13 are removed. Then, the hydrate agent 17 is thrown into the endothermic bag 13 so as to cause endothermic reaction and hence lower the temperature in the endothermic bag 13. The moisture separated is absorbed into the polymeric water absorption agent 19, turned into gel state, thereby upgrading slightly the continuity of the endothermic reaction. Then, the hydrate agent 17 contained in the second hydrate bag 12B is thrown into the endothermic bag 13 to cause the endothermic reaction again, thereby lowering the temperature in the endothermic bag 13 again. This construction makes it possible to obtain cold heat source indoors and outdoors in a hot season and use it for a long time.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for obtaining a cold heat source, for example, during leisure and sports viewing in hot seasons, for medical use, emergency use, high temperature workplaces, etc. This invention relates to a method for easily obtaining a cold source that can be used for a long time both indoors and outdoors.

(Prior art) A conventional method for obtaining a cold source is, for example, in a double-layer cold pack with one small inner bag inside a large outer bag, water is poured into the inner bag, and the inner bag is closed. Prepare a cooling material pack containing a mixture of granular urea and ammonium nitrate as heat absorbing agents in the outer bag on the outside of the outer bag, and when a cold source is required, hit the outer bag from the outside. The inner bag is destroyed and the water in the inner bag and the endothermic agent in the outer bag are mixed to cause an endothermic reaction, which lowers the temperature of the cooling material pack and provides a source of cold heat.

(Problem to be solved by the invention) However, because the endothermic agent and the water in the inner bag react instantaneously, the endothermic reaction is rapid and the temperature of the cooling material pack becomes low instantaneously, but after the reaction is completed, The temperature rises rapidly due to the large temperature difference with the air temperature.

For this reason, there is a problem in that the cooling material pack has a short cooling time during which a cooling sensation can be obtained.

Therefore, the present invention prepares at least two water-containing bags for storing a water-containing agent and an endothermic bag for storing an endothermic agent, and performs the mixing of the water-containing agent and the endothermic agent and the endothermic reaction in two times at a preferred time. The purpose of the present invention is to provide a method of obtaining a cold heat source that has a significantly longer cold storage time, which gives a false sense of coldness.

(Means for Solving the Problems) A method for obtaining a cold heat source according to the present invention includes storing at least two water-containing bags containing a water-containing agent containing water, and an endothermic agent that causes an endothermic reaction when mixed with the water-containing agent. First, the water-containing agent in the first water-containing bag of the two water-containing bags is mixed with the endothermic agent in the endothermic bag to cause an endothermic reaction to lower the temperature inside the endothermic bag, and then , when the heat absorbing bag is left in the outside air and the temperature of the heat absorbing bag rises, the second of the two water-containing bags
The water-containing agent in the water-containing bag is mixed with the endothermic agent in the endothermic bag to cause an endothermic reaction and the temperature inside the endothermic bag is lowered again. Further, it is preferable to add a polymeric water absorbing agent to the endothermic agent.

Here, each water-containing bag and heat-absorbing bag may be a single bag body,
A combination may be used, or a portion of these bags may be connected by a connecting member.

In addition, a water-containing agent that contains water is a compound that contains water or water of crystallization, such as sodium sulfate (sodium sulfate decahydrate N az S 04 ・10HzO).
, sodium carbonate decahydrate (Nat CO* -t
.

H, O), sodium thiosulfate pentahydrate (Na, 52-
0.・5Hz○), calcium chloride hexahydrate (CaC1,
・6HzO) and other salts containing water of crystallization.

In addition, as an endothermic agent, ammonium nitrate (NH
4N08), sodium nitrate (NaNO3), ammonium chloride (ammonium chloride NH4CI), urea ((NH2)z
c○), potassium chloride (KCl), potassium nitrate CKN
O3) and mixtures thereof in appropriate amounts.

Further, the endothermic reaction is due to a reaction between the endothermic agent and the water in the water-containing agent, and a reaction using a salt containing water of crystallization is more preferable than water. Conventional cooling material bags made of water and an endothermic agent (e.g., ammonium nitrate) rapidly increase in temperature during the - reaction, as shown in Test Example 4 in the table below and the arrow ■ in Figure 5. Temperatures drop, sometimes to below freezing, but they also rise quickly.

Therefore, the cold storage time to maintain the temperature below 20℃ is 45℃.
Very short, only minutes. The endothermic reaction between the water-containing agent, which is a salt (compound) containing water of crystallization, and the endothermic agent is an endothermic reaction between the crystal water in the water-containing agent and the endothermic agent, and a low temperature can be maintained for a long period of time. In particular, if the water-containing agent is divided, for example into two parts, and the endothermic agent is mixed in two parts to cause an endothermic reaction, the cooling time can be significantly extended. Arrow in Figure 5 ~
The booth shown in ■ is compatible with the hot season and has a temperature of 30℃ and humidity of 58% RH (portable booth manufactured by Sankon Seki Kogyo ■).
The test was conducted by placing a glass container inside.

Sample 1 in the following table and the one indicated by the arrow ■ in Fig.
When an endothermic reaction was caused by mixing with 50 g of ammonium nitrate as an endothermic agent with an elapsed time between the first and second times, the first
The first cold storage time was 75 minutes, the second cold storage time was 70 minutes, and the total cold storage time was 145 minutes. That is, the cold storage time can be significantly extended by dividing the water-containing agent into two doses and sequentially adding them, rather than adding the water-containing agent only once.

In addition, test example 2.3 in the following table and arrows ■■ in Figure 5 are as follows:
Under the same test conditions as indicated by the arrow ■ above, 25 g of Glauber's Salt, a water-containing agent, was
This is a case where the sample was divided into two batches and put into a different heat absorbing agent than Test Example 1, and the total cold storage time was 160 minutes and 135 minutes, respectively.
very long in minutes.

(This page, blank space below) In addition, as polymeric water absorbing agents, starch-based starch-acrylic acid graft copolymers, cellulose-based cellulose-acrylonitrile graft copolymers, and other vinyl acetate-
Examples include polymeric water absorbing agents such as methyl methacrylate copolymers. These polymeric water absorbing agents may be added to the heat absorbing agent to contain 13F. Furthermore, the polymeric water absorbing agent may be provided with an outer skin layer covering the outer surface of the heat absorbing bag, and may be used as a single layer within the outer skin layer or within other layers, such as a paper pulp layer or a flocculent pulp layer. It may also be dispersed and contained.

(Function) The method for obtaining a cold heat source according to the present invention involves preparing at least two water-containing bags for storing a water-containing agent and an endothermic bag for storing an endothermic agent, and first, the water-containing agent in the tenth ice-containing bag is heated to absorb heat. When placed in a bag and mixed with an endothermic agent, for example, shaking the endothermic bag from side to side to mix it causes an endothermic reaction and lowering the temperature of the endothermic bag, and then leaving it in the outside air and the temperature of the endothermic bag rises. , the water-containing agent in the second water-containing bag is put into the endothermic bag, and the endothermic reaction is caused again in the same manner to lower the temperature of the endothermic bag again. Therefore, compared to the conventional case where all the water-containing agents cause an endothermic reaction at once and cause a rapid temperature drop and rise, the cold storage time during which the cold sensation is felt is significantly longer.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 4 are diagrams showing an example of an apparatus for implementing the method for obtaining a cold source according to the present invention.

First, the configuration will be explained. In Figure 1.2, 1
1 is a cold material pack, and the cold material pack 11 is a combination of a second first water-containing bag 12A, a second ice-containing bag 12B (hereinafter referred to as the water-containing bag 12), and a cold bag 13. These are separate containers made of waterproof paper or sheet-like resin such as polyethylene, or a combination thereof.

Each opening 12 of each water-containing bag 12 and endothermic bag 13
A, 12b and opening 13a are each provided with a cap 1.
5a, 15b and 15c are attached to close each opening. A water-containing agent 17 containing water is contained in the water-containing bag 12.
25g (25 parts by weight) of mirabilite is stored.

The endothermic bag 13 contains 50 g (50 overlapping parts) of ammonium nitrate, which is an endothermic agent 18 that mixes with the water-containing agent 17 to cause an endothermic reaction, and a polymeric water-absorbing agent 19 added to the endothermic agent 18 in an appropriate amount. The total weight of the water-containing agent 17 and the weight of the endothermic agent 18 are such that an endothermic reaction occurs sufficiently, and the weight of the polymeric water-absorbing agent is such that it can absorb all the water generated by the endothermic reaction and gel.

Next, the effect will be explained.

To obtain a cold heat source, prepare the two water-containing bags 12 and the heat-absorbing bag 13 described above, first remove the cap 15a of the first water-containing bag 12A, and then remove the cap 15c of the heat-absorbing bag 13, as shown in FIG. As shown, the water-containing agent 17 is put into the heat absorbing bag 13. Then, the endothermic bag 13 is shaken from side to side to mix the endothermic agent 18 and water-containing agent 17 inside the endothermic bag 13, causing an endothermic reaction and lowering the temperature inside the endothermic bag 13. The temperature inside the endothermic bag 13 decreased to about 8°C. The water liberated by the endothermic reaction is absorbed by the polymeric water-absorbing agent 19 and becomes gelatinized, becoming stable and gelatin-like. This gelation somewhat improves the sustainability of the endothermic reaction. In addition, due to this stabilization, the heat absorption bag 1
The moisture inside the heat absorbing bag 13 does not move or fluctuate greatly, and becomes semi-solid like gelatin, giving a smooth and pleasant feeling to the skin in contact with the outside of the heat absorbing bag 13.

Next, the heat-absorbing bag 13 was left in an outside temperature of about 30°C for about 75 minutes, and when the temperature of the heat-absorbing bag 13 rose to about 20°C, as shown in FIG. Similarly, the water-containing agent 17 (mirabilite) in the second ice-containing bag 12B is put into the heat-absorbing bag 13. And the cap 1 of the heat absorption bag 13
5c, by shaking the endothermic bag 13 left and right, the water-containing agent 17 (mirabilite) mixes with the ammonium nitrate in the endothermic bag 17 and causes an endothermic reaction again, and the temperature inside the endothermic bag 13 decreases to about 1
The temperature dropped to 6°C. After this, the heat absorbing bag 1 is placed at a temperature of approximately 30℃.
Although the temperature inside the bag 3 gradually rises, the heat absorbing bag 13 can maintain a temperature range of approximately 20°C or lower, where one feels a cooling sensation, for an additional 70 minutes, for a total of approximately 145 minutes, that is, for approximately 2 hours. It had a cooling time that gave a sufficient cooling sensation.

Also, due to this endothermic reaction, the water liberated from the mirabilite in the second ice-containing bag 12B is further absorbed by the gel-like polymeric water-absorbing agent, which is already partially gel-like, and becomes an integral gel-like substance, which stabilizes the entire water. It has a gelatin-like smooth feel.

In the above embodiment, the heat absorption bag 13 is a container made of waterproof paper or a sheet-like resin such as polyethylene. This outer surface may be coated with a jacket layer containing a polymeric water-absorbing agent. Thereby, water droplets condensed on the outer surface of the heat absorbing bag 13 are absorbed, and sweat from the human body is also absorbed. Furthermore, by covering the outermost layer with a nonwoven fabric, it can give a dry, pleasant and unpleasant feel to the skin.

(Effects) As described above, according to the present invention, a cold source can be easily obtained indoors and outdoors where a cold source is not easily available in the hot season, and it can be used for a long time.

[Brief explanation of the drawing]

1 to 4 are views showing a combination for carrying out the method for obtaining a cold source according to the present invention, FIG. 1 is a plan view including a partial cross section, and FIGS. 2(a) and (b). ) are the first
11a-11a, I[b-11b arrow sectional view, and FIG. Fifth
The figure is a graph showing the relationship between the type of cooling material and the cold storage time according to the present invention. 11... Cold material pack, 12.12A, 12B... Water-containing bag, 13...
... Endothermic bag, 15a, 15b, 15c ... Key t'7p, 17 ... Water-containing agent, 18 ... Endothermic agent, 19 ... Polymer Water absorbing agent. Agent Patent Attorney Ugagun Partial Figures Figures Figures Figures Figures

Claims (2)

[Claims] (1) Prepare at least two water-containing bags that store a water-containing agent containing water and a storage bag that stores an endothermic agent that causes an endothermic reaction when mixed with the water-containing agent. The water-containing agent in the water-containing bag No. 1 is mixed with the endothermic agent in the endothermic bag to cause an endothermic reaction to lower the temperature inside the endothermic bag, and then,
When the heat-absorbing bag is left in the outside air and the temperature of the heat-absorbing bag rises, the water-containing agent in the second water-containing bag of the two water-containing bags is mixed with the heat-absorbing agent in the heat-absorbing bag to cause an endothermic reaction. A method for obtaining a cold heat source characterized by lowering the temperature inside the heat absorbing bag again. (2) The method for obtaining a cold heat source according to claim 1, wherein a polymeric water absorbing agent is added to the endothermic agent.