JP2003207243A - Instant coolant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy coolant capable of easily mixing both by breaking a partition part separating both by external pressure, capable of maintaining a cooling effect over a long time, and capable of forming an instant coolant using inorganic metallic hydrate salt into a practical form in the instant coolant produced by mixing a substance exerting the endothermic action when dissolved in water and the inorganic metallic hydrate salt at use time. <P>SOLUTION: This instant coolant 1 is formed by filling the substance exerting the endothermic action when dissolved in water in one chamber 5 of a sealed bag 2 composed of two chambers partitioned by an easily breaking partition part 4, and filling the inorganic metallic hydrate salt and its saturated aqueous solution in the other one chamber 6, and has a structure for mixing the inorganic metallic hydrate salt and its saturated aqueous solution with the substance exerting the endothermic action when dissolved in water by breaking the partition part 4 by the external pressure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substance which exhibits an endothermic action when dissolved in water and an instant cooling agent using an inorganic metal hydrate salt.

[0002]

2. Description of the Related Art Conventionally, as a simple instant cooling agent, a cooling storage agent using a substance having a large heat storage capacity and a cooling agent utilizing an endotherm generated when two or more substances are mixed are known. Is distributed for food, leisure. By the way, the former regenerator has a drawback that it cannot be used immediately because it has to be cooled in a refrigerator in advance before use.

On the other hand, the latter cooling agent has the advantage that it is not necessary to cool it in advance and the cooling effect can be easily obtained. For example, endothermic reaction when commercially available ammonium nitrate or the like dissolves in water. The cooling agent using the above could not maintain the cooling effect for a long time. Various techniques have been disclosed for this drawback. For example, a method of using water supported on a water-absorbent resin as a water supply source (JP-A-60-4581, JP-A-1-289889),
A method of using water in so-called hydrogel (Japanese Patent Laid-Open No. 57-
96076), but a sufficient cooling sustaining effect was not obtained. Further, a method utilizing water of crystallization of an inorganic metal salt hydrate such as sodium sulfate decahydrate has been disclosed (JP-A-57-73069, JP-A-63-238378), and a sufficient cooling sustaining effect is obtained. However, it is not a cooling agent in a form in which a powdery endothermic substance and a hydrous salt can be easily mixed at the time of use, and the fact is that it has not been put to practical use. In addition, there is a problem that the hydrous salt solidifies over time,
On the other hand, a method of blending a water-absorbing resin with a hydrous salt (JP-A-2-120387) and a method of blending a water-repellent silica (JP-A-9-53066) have been proposed. There is a problem that the substance and the hydrated salt cannot be simply mixed at the time of use.

[0004] Further, these cooling agents are 0 ° C or less at the time of use and can be used as a substitute for the cooling storage agent when storing foods in an adiabatic warehouse, but lower cooling temperatures are not always desired. It was not suitable for use in a scene, that is, for locally cooling the human body, because the temperature becomes too low.

[0005]

The object of the present invention is to provide a substance which exhibits an endothermic action when dissolved in water, and an instant coolant in which an inorganic metal hydrate is mixed at the time of use, so that both can be easily mixed. The purpose of the present invention is to provide a coolant which has a practical form and maintains a cooling effect for a long time. Another object of the present invention is to mix a substance exhibiting an endothermic action when dissolved in water and an inorganic metal hydrate, without becoming too low in temperature, and a cooling agent which maintains a cooling effect for a further long time. Is to provide.

[0006]

Means for Solving the Problems As a result of intensive studies by the present inventors, one chamber of a sealed bag consisting of two chambers was filled with a substance exhibiting an endothermic action when dissolved in water, and another chamber was filled. By filling the chamber with an inorganic metal hydrate and its saturated aqueous solution, the compartment is easily broken by external pressure, and the inorganic metal hydrate and its saturated aqueous solution have an endothermic action when dissolved in water. The present invention has been completed based on the knowledge that the material is mixed with a substance exhibiting the effect of instantaneous cooling. Further, an inorganic metal hydrate salt and its saturated aqueous solution in a sealed bag consisting of two chambers are prepared by filling a water-soluble film bag made of polyvinyl alcohol with a part of a substance exhibiting an endothermic action when dissolved in water. The present invention has been completed based on the finding that by filling one chamber on the side other than the chamber in which the is not filled, the temperature does not become too low, and the instant cooling agent maintains the cooling effect for a longer time.

The present invention is the following instant coolant. (1) One chamber of a sealed bag made up of two chambers partitioned by an easily destructible compartment is filled with a substance having an endothermic action when dissolved in water, and the other chamber is made of an inorganic metal. It is composed of hydrated salt and its saturated aqueous solution, and the partition is broken by external pressure, and it has a structure in which the inorganic metal hydrate salt and its saturated aqueous solution are mixed with a substance that exhibits an endothermic action when dissolved in water. Instant coolant. (2) The instant cooling agent according to (1) above, wherein the substance exhibiting an endothermic action when dissolved in water is ammonium nitrate, or ammonium nitrate and urea, and the inorganic metal hydrate is sodium sulfate decahydrate. (3) One chamber is filled with the inorganic metal hydrate and its saturated aqueous solution so that the upper end surface of the inorganic metal hydrate salt is below the liquid surface of the saturated aqueous solution, and the compartment is destroyed by pressing. The instant cooling agent according to the above (1) or (2), which is configured as described above. (4) A part of a substance exhibiting an endothermic effect when dissolved in water is filled in a water-soluble film bag, and this bag is filled with an inorganic metal hydrate salt and a saturated aqueous solution thereof in a sealed packaging bag consisting of two chambers. The instant cooling agent according to any one of (1) to (3) above, which is filled in one chamber on the side other than the filled chamber.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below. The instant coolant of the present invention is one of a sealed packaging bag consisting of two chambers partitioned by a destructible compartment.
The chamber is filled with a substance that exhibits an endothermic effect when dissolved in water,
The other chamber is filled with an inorganic metal hydrate and its saturated aqueous solution.

A substance which exhibits an endothermic action when dissolved in water used in the present invention (hereinafter sometimes referred to as an endothermic substance)
Is a substance that cools the entire solution by absorbing heat when it is dissolved in water, and it is preferable that the temperature when cooled is 0 to −20 ° C. Examples of such a substance include inorganic ammonium salts such as ammonium nitrate, ammonium sulfate, ammonium phosphate, diammonium hydrogen phosphate, ammonium metavanadate, ammonium chloride, ammonium bromide and ammonium iodide, and alkali metal salts such as sodium nitrate and potassium nitrate. , Urea and the like. These may be used alone or in combination of two or more. In the present invention, ammonium nitrate or a mixture of ammonium nitrate and urea is particularly preferable, and in that case, the ratio of ammonium nitrate to urea is more preferably 1: 1 to 4: 1. These are usually commercially available substances in the form of powder or granules. In the instant cooling agent of the present invention, the substances that exhibit an endothermic action when dissolved in water are usually in a ratio of 4: 1 to 1: 4 with respect to the total weight of the metal hydrate described below and its saturated aqueous solution. , Preferably in a ratio of 2: 1 to 1: 2.

Inorganic metal hydrates used in the present invention (hereinafter,
(Sometimes referred to as hydrated salt) is a metal salt containing water as crystallization water and the like, and those containing as much water as possible are preferable. Examples of such salts include sodium sulfate 10
Hydrochloride, sodium metasilicate 9 hydrate, sodium carbonate 10
Examples thereof include hydrate, sodium dihydrogen phosphate dodecahydrate, strontium hydroxide octahydrate. In the present invention, sodium sulfate decahydrate is particularly preferable.

In the present invention, these inorganic metal hydrates are
It is used together with a saturated aqueous solution of these inorganic metal hydrates.
In this case, by using a saturated aqueous solution in an amount larger than the voids between the metal hydrated salts, when an external pressing force is applied, the saturated aqueous solution of the solid inorganic metal hydrated salt pushes the partition, so that the partition is fragile. Are easily destroyed. As a result, the inorganic metal hydrate and its saturated aqueous solution are mixed with a substance exhibiting an endothermic action when dissolved in water, and cooling is performed. A saturated aqueous solution dissolves a substance having an endothermic effect, and after a slight time difference, a large amount of undissolved salt crystal water is used for dissolution, which is a characteristic of a coolant that uses crystal water. It becomes possible to obtain an instantaneous coolant having a cooling time.

In the present invention, when one bag chamber is filled with an inorganic metal hydrate salt impregnated with its saturated solution,
It is preferable to set the ratio such that the upper end surface of the inorganic hydrated metal salt is below the liquid surface of the saturated aqueous solution. As a result, the liquid can be moved by pressing to easily break the compartment, and the saturated aqueous solution of the inorganic metal hydrate may be prepared by previously dissolving the inorganic metal hydrate in water. When filling one chamber of a sealed bag made of chambers, water may be added together with the inorganic metal hydrate so that the saturated solution may be impregnated with the inorganic metal hydrate.

The bag of the instant coolant of the present invention has two chambers partitioned by the easily destructible partition, and the partition is destroyed by external pressure to form one chamber. Specifically, a bag made of heat-sealable material such as polyethylene or polyethylene laminated aluminum is divided into two chambers with an easily peelable adhesive partition wall, or made of polyethylene or polyethylene laminated aluminum. Examples of the heat-sealable bag include a sealed bag having at least one easily separable adhesive partition wall. In the former case, either the left or right chamber may be filled with the inorganic metal hydrate and its saturated aqueous solution, while in the latter case, the inorganic metal is contained in a bag having at least one easily destructible compartment. Fill with water-containing salt and its saturated aqueous solution and seal it, and, together with the bag, place a substance that exhibits an endothermic action when dissolved in water in a bag made of heat-sealable material such as polyethylene or polyethylene laminated aluminum. Fill and seal. The easily destructible compartment reduces the heat seal temperature,
Alternatively, it can be formed by heat-sealing an incompatible film to form an easily separable adhesive partition wall.

In the case of an instant cooling agent which does not become too low in temperature and maintains a cooling effect for a long time, a part, preferably the whole amount of a substance which exhibits an endothermic action when dissolved in water is used. On the other hand, 30% to 95%, more preferably 50
% To 90% in a polyvinyl alcohol water-soluble film bag, and then in a sealed bag consisting of two chambers, one chamber not filled with the inorganic metal hydrate and its saturated aqueous solution. To do. The polyvinyl alcohol water-soluble film is a film that dissolves in water in a short time, but the dissolution rate becomes extremely slow in an aqueous solution containing a high-concentration salt, and the water gradually enters the polyvinyl alcohol water-soluble film bag. It utilizes the phenomenon of permeation.

In addition to the above components, the instant cooling agent of the present invention may contain a thickening agent, a carrier, a pigment, etc. in either side of the compartment, if necessary. Examples of the thickener include carboxymethyl cellulose, sodium polyacrylate,
Examples thereof include xanthan gum, but are not limited thereto. Examples of the carrier include clays, calcium carbonate, bentonite, talc, diatomaceous earth, zeolite, attapulgite, gypsum, porcelain stone, white carbon, pumice stone, wood powder, pearlite composed of pearlite and obsidian, and the like. It is not limited. These components can be added in appropriate amounts as needed.

The instant cooling agent of the present invention is usually prepared so as to have a total weight of 50 g to 1000 g, but is not limited thereto.

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are perspective views showing another embodiment.

In FIG. 1, the instant coolant 1 is formed by sealing two bags 2 made of polyethylene or polyethylene-laminated aluminum plastic film by a heat-sealing portion 3, and easily peeled off at a middle portion by low-temperature heat-sealing. The first chamber 5 by the easily destructible partitioning part 4 consisting of the adhesion partition wall of
And is divided into the second chamber 6. The first chamber 5 is filled with the endothermic substance 7. The second chamber 6 is filled with a hydrous salt 8 and a saturated aqueous solution 9 thereof. The saturated aqueous solution 9 has a larger amount than the voids between the hydrated salts 8, and the set upper end surface 11 of the hydrated salt 8 is below the liquid surface of the saturated aqueous solution. A part of the endothermic substance 7 in the first chamber 5 may be housed in a soluble bag 12 made of a polyvinyl alcohol water-soluble film.

The instant coolant 1 grips the second chamber 6 side,
Alternatively, the saturated aqueous solution 9 may be tapped by hand to form the partition 4
Is destroyed and flows into the first chamber 5, and the endothermic substance 7 is dissolved in this saturated aqueous solution. Cooling starts due to the heat absorption at that time,
After a slight time difference, a large amount of water of crystallization of the hydrous salt 8 is released, the endothermic substance 7 is dissolved, and the cooling effect is maintained. When a part of the endothermic substance 7 in the first chamber 5 is housed in the soluble bag 12 made of a water-soluble film made of polyvinyl alcohol, it takes a long time to dissolve the soluble bag 12, so that the cooling rate becomes slow and the cooling temperature becomes low. Not too low.

In FIG. 2, the instantaneous coolant 1 is wholly in the first chamber 5
In the bag 2 sealed with the heat seal part 3 so that
Another bag 2a having three sides formed by the heat-sealed portion 3a and one side formed by the easily destructible partition portion 4 is inserted. Bag 2
The second chamber 6a is formed in a, and the hydrated salt 8 and the saturated aqueous solution 9 are filled in the same manner as the second chamber 6 in FIG.

In the instant coolant 1 of FIG. 2, the saturated aqueous solution is pressed to destroy the partition 4 by grasping or tapping the portion where the bag 2a is present from the outside of the instant coolant 1, and the same as in the case of FIG. Can be cooled down. Also in this case, the cooling temperature can be lowered by accommodating a part of the endothermic substance 7 in a soluble bag made of a water-soluble film made of polyvinyl alcohol.

[0022]

EXAMPLES The present invention will be described in more detail below with reference to examples and test examples, but the present invention is not limited to these examples.

Example 1 130 g of sodium dihydrogen phosphate dodecahydrate and 50 g of a saturated aqueous solution thereof were placed in a polyethylene bag having a peelable adhesive partition on one side and heat-sealed. In the bag, the upper end surface of sodium dihydrogen phosphate dodecahydrate sedimentation was below the liquid surface of the saturated aqueous solution.
This bag and 150 g of monoammonium phosphate were placed in a polyethylene bag and heat-sealed to obtain an instant cooling agent of the present invention. When the instantaneous cooling agent thus obtained is hit with a hand, the peelable adhesive partition wall of the bag in which the sodium dihydrogen phosphate dodecahydrate and its saturated aqueous solution are packaged is broken, and the mixture can be mixed with monoammonium phosphate. Rub it by hand and use it.

Example 2 130 g of sodium sulfate decahydrate and 60 g of a saturated aqueous solution thereof were placed in a polyethylene bag having a peelable partition wall on one side, and heat-sealed. In the bag, the upper end surface of the sodium sulfate decahydrate sedimentation was below the liquid surface of the saturated aqueous solution. This bag and 150 g of ammonium nitrate are put into a polyethylene bag, and the bag is divided by a heat-sea fragile partition wall and sealed,
The instant coolant of the present invention was obtained. The instantaneous coolant thus obtained was beaten by hand to break the peelable adhesion partition wall of the bag in which sodium sulfate decahydrate and its saturated aqueous solution were packaged, so that it could be mixed with ammonium nitrate, and was rubbed well by hand. Understand and use.

Example 3 130 g of sodium sulfate decahydrate and 60 g of a saturated aqueous solution thereof were put in one chamber of a polyethylene bag which was divided into two chambers by a peelable adhesion partition wall, and 100 g of ammonium nitrate was placed in the other chamber. Urea (50 g) was added, and the mixture was heat-sealed and hermetically sealed to obtain the instant cooling agent of the present invention. In the bag, the upper end surface of the sodium sulfate decahydrate sedimentation was below the liquid surface of the saturated aqueous solution. The obtained instant cooling agent was squeezed firmly by hand with the side on which the sodium sulfate decahydrate and its saturated aqueous solution were packaged to break the peelable adhesion partition wall that was divided into two chambers, and to remove ammonium nitrate and urea. It becomes a state where it can be mixed, and it is kneaded by hand and used.

Example 4 130 g of sodium sulfate decahydrate and 60 g of a saturated aqueous solution thereof were placed in one chamber of a polyethylene bag which was divided into two chambers by a peelable adhesion partition wall, and another chamber had 50 g of ammonium nitrate, and Urea 25 g and polyvinyl alcohol water-soluble film (Hi-Selon S-600: manufactured by Nippon Synthetic Chemical Industry Co., Ltd., film thickness 40 μm) were filled with ammonium nitrate 50 g and urea 25 g in a sealed bag and heat-sealed. The instant cooling agent of the present invention was obtained. In the bag, the upper end surface of the sodium sulfate decahydrate sedimentation was below the liquid surface of the saturated aqueous solution. The obtained instant cooling agent was obtained by squeezing the side on which the sodium sulfate decahydrate and its saturated aqueous solution were packaged with a hand, to break the peelable adhesive septum which was divided into two chambers, ammonium nitrate and urea, It will be in a state that it can be mixed with a bag of polyvinyl alcohol water-soluble film of ammonium nitrate and urea, and it will be kneaded well by hand before use.

Example 5 130 g of sodium sulfate decahydrate and 60 g of its saturated aqueous solution were placed in one chamber of a polyethylene bag which was divided into two chambers by a peelable adhesion partition wall, and another chamber was charged with 20 g of ammonium nitrate and Urea 10 g, polyvinyl alcohol water-soluble film (Hi-Selon S-600: manufactured by Nippon Synthetic Chemical Industry Co., Ltd., film thickness 40 μm), ammonium nitrate 80 g, and urea 40 g were put in a sealed bag and heat-sealed. The instant cooling agent of the present invention was obtained. In the bag, the upper end surface of the sodium sulfate decahydrate sedimentation was below the liquid surface of the saturated aqueous solution. The obtained instant cooling agent was obtained by squeezing the side on which the sodium sulfate decahydrate and its saturated aqueous solution were packaged with a hand, to break the peelable adhesive septum which was divided into two chambers, ammonium nitrate and urea, It will be in a state that it can be mixed with a bag of polyvinyl alcohol water-soluble film of ammonium nitrate and urea, and it will be kneaded well by hand before use.

Comparative Example 1 150 g of water was put in one chamber of a polyethylene bag which was divided into two chambers by a peelable adhesion partition wall, 100 g of ammonium nitrate and 50 g of urea were put in the other chamber, and heat-sealed. Then, an instant cooling agent was obtained. The resulting instant coolant is 2
The peelable adhesive septum that is divided into chambers breaks and becomes a state in which it can be mixed with ammonium nitrate and urea, and it is thoroughly kneaded by hand before use.

Comparative Example 2 130 g of sodium sulfate decahydrate was placed in one chamber of a polyethylene bag divided into two chambers by a peelable adhesive partition wall, 100 g of ammonium nitrate and 50 g of urea were placed in the other chamber, and heated. It was sealed and sealed to obtain an instant cooling agent. The obtained instant cooling agent strongly squeezed the side on which the sodium sulfate decahydrate was packaged with a hand or gave a shock to it, but the peelable adhesion partition wall divided into two chambers was not broken, It was not possible to make sodium sulfate decahydrate, ammonium nitrate and urea mixable.

Comparative Example 3 130 g of sodium sulfate decahydrate and 60 g of its saturated aqueous solution were placed in one chamber of a polyethylene bag which was divided into two chambers by a peelable adhesion partition wall, and another chamber was charged with 20 g of ammonium nitrate, and 10 g of urea, 80 g of ammonium nitrate and 40 g of urea were put in a vinyl bag, and a bag having 10 holes of 1 mm in a direct line was put by using a heated wire, and heat sealed and sealed to obtain an instantaneous coolant. In the bag, the upper end surface of the sodium sulfate decahydrate sedimentation was below the liquid surface of the saturated aqueous solution. The obtained instant cooling agent was obtained by squeezing the side on which the sodium sulfate decahydrate and its saturated aqueous solution were packaged with a hand, to break the peelable adhesive septum which was divided into two chambers, ammonium nitrate and urea, It can be mixed with ammonium nitrate and urea plastic packaging bags, and it should be kneaded by hand before use.

Test Example 1 (Cooling Performance Test-1) The instant coolants of Examples 1 to 3 and Comparative Example 1 were put into use and placed in a 9 liter styrene foam insulation box.
The temperature of the coolant was measured every minute. Further, as a control, the same measurement was performed on a commercially available regenerator (300 g) cooled in a freezer of a domestic refrigerator for one day. The results are shown in Fig. 3.
From FIG. 3, Examples 1 to 3 had a long-term cooling ability as compared with Comparative Example 1 and the commercially available regenerator.

Test Example 2 (Cooling Performance Test-2) The instantaneous coolants of Examples 3 to 5 and Comparative Example 3 were used, and the temperature of the coolant was measured every 10 minutes under room temperature conditions.
The results are shown in Fig. 4. As shown in FIG. 4, Examples 4 to 5 had a higher minimum cooling temperature as compared with Example 3, but had a longer cooling ability. On the other hand, in Comparative Example 3, the temperature increased in a short time as compared with Examples 4 to 5.

Test Example 3 (Cooling Performance Test-3) An aluminum vat was floated in a constant temperature water tank whose water temperature was adjusted to 37.5 ° C., and the instant coolant of Example 5 was placed there, and the aluminum vat and the instant were applied. The temperature between the coolants was measured every 5 minutes. Further, as a control, the same measurement was performed on a commercially available anti-fever gel cooling sheet. Results are shown in FIG. From FIG. 5, Example 5 had a long-term cooling ability as compared with the control anti-gel gel cooling sheet.

[0034]

According to the present invention, one chamber of a sealed bag composed of two chambers partitioned by an easily destructible partition is filled with a substance exhibiting an endothermic action when dissolved in water, and the like. Since one chamber of is filled with an inorganic metal hydrate and its saturated aqueous solution, a substance that exhibits an endothermic action when dissolved in water and an instant coolant that mixes the inorganic metal hydrate at the time of use, are It is possible to break the partition that separates the two and mix them easily, it is possible to maintain the cooling effect for a long time, and make the instant coolant using an inorganic metal hydrate salt a practical form. be able to. Further, by filling a part of a substance exhibiting an endothermic action when dissolved in water into a water-soluble film made of polyvinyl alcohol, the temperature does not become too low, and the cooling effect can be maintained for a longer time. Become.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment.

FIG. 2 is a perspective view showing another embodiment.

FIG. 3 is a graph of test results of Test Example 1.

FIG. 4 is a graph of test results of Test Example 2.

5 is a graph of test results of Test Example 3. FIG.

[Explanation of symbols]

1 Instant coolant 2,2a bag 3,3a Heat seal part 4 divisions 5 Room 1 6,6a 2nd chamber 7 Endothermic substances 8 Hydrous salt 9 saturated aqueous solution 11 Settling top surface of hydrous salt 8 12 Polyvinyl alcohol bag

Claims (4)

[Claims] 1. A sealed bag consisting of two chambers partitioned by an easily destructible compartment is filled with a substance exhibiting an endothermic action when dissolved in water, and the other chamber is filled with an inorganic material. The metal hydrate salt and its saturated aqueous solution are filled, the compartment is broken by external pressure, and the inorganic metal hydrate salt and its saturated aqueous solution are mixed with a substance that exhibits an endothermic action when dissolved in water. Instant coolant with. 2. The instant cooling agent according to claim 1, wherein the substance exhibiting an endothermic action when dissolved in water is ammonium nitrate or ammonium nitrate and urea, and the inorganic metal hydrate is sodium sulfate decahydrate. 3. An inorganic metal hydrate and a saturated aqueous solution thereof are charged in one chamber so that the upper end surface of the inorganic metal hydrate salt is below the liquid surface of the saturated aqueous solution, and the partition is divided by pressing. The instant coolant according to claim 1 or 2, which is configured to break. 4. A water-soluble film bag is filled with a part of a substance exhibiting an endothermic action when dissolved in water, and the bag is filled with an inorganic metal hydrate and its saturation in a sealed packaging bag consisting of two chambers. The one chamber on the side other than the chamber filled with the aqueous solution is filled.
The instant coolant according to any one of 1 to 3.