JPH01203490A - coolant - 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 [Field of Industrial Application] This invention relates to a cooling agent for cooling people, animals and substances as needed.

[Conventional technology]

Conventionally, as an instant coolant, water and ammonium salt, or water and ammonium salt with water-absorbing gel added thereto have been used. Ammonium salts are mainly ammonium nitrate (NH4NO3
). For example, as a conventional example,
A mixture of Dege, sodium thiosulfate, ammonium chloride, and potassium nitrate is used. Here, the reason why the water-absorbing gel is added to water is to give water viscosity and slow down the rate of dissolution of the ammonium salt.

For example, water to which water-absorbing gel has been added and ammonium salt in one container are stored in separate bags and separated so that they cannot come into contact with each other. When the bags containing water containing ammonium salt and water-absorbing gel are ruptured by applying an external shock, the ammonium salt dissolves in the water, and since the heat of dissolution of ammonium salt is endothermic,
The temperature of the sample is lowered below room temperature and can be used for cooling.

[Problem to be solved by the invention]

Water to which water-absorbing gel has been added remains highly viscous until the ammonium salt is dissolved, but once even a small amount of ammonium salt is dissolved, the water immediately loses its viscosity and returns to normal low-viscosity water. there were.

When water returns to low viscosity, the ammonium salt dissolves more quickly, which has the disadvantage of shortening the time it can be used in practice as a coolant.

This invention was made to solve this problem, and aims to provide a coolant that can be cooled for a long time and is highly practical.

[Means to solve the problem]

The coolant of this invention contains an ammonium salt and a salt-resistant water-absorbing gel, and is formed of water that dissolves the ammonium salt.

[Effect]

Even if the ammonium salt is dissolved in water made highly viscous by the salt-resistant water-absorbing gel of the present invention, it is prevented from losing its high viscosity.

〔Example〕

The salt-resistant water-absorbing gel according to the present invention, for example, Aqualic CS (trade name, manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd.) and polyacrylic acid-based water-absorbing resin are used. In addition,
These are preferably used in an amount of 4 to 20% by weight. If it is less than 4 times tS, the effect is small, and if it is more than 20% by weight, the frame becomes too viscous and expensive. Note that instead of using only the salt-resistant water-absorbing gel to achieve high viscosity, it is also possible to replace about half of it with inexpensive carboxymethyl cellulose (CMC), which is desirable for cost reduction.

As the ammonium salt according to the present invention, at least one of ammonium nitrate (NH4NO3) and ammonium chloride (NH2O) is used. Note that [ammonium nitrate]/[ammonium chloride]-1
It is preferable to use the mixture at a mixing ratio of 3 to 3; if it is 3 or more, there is a risk of explosion, and if it is 1 or less, the solubility will be low and the dissolution rate will be high. Further, it is desirable that the ammonium salt concentration is 10% by weight or more, and if it is 10% by weight or less, the cooling effect rate is low.

As described in the conventional example, both the salt-resistant water-absorbing gel of the embodiment of the present invention, the water made highly viscous by adding CMC, and the ammonium salt mixture of the embodiment of the present invention are placed in separate bags to prevent them from coming into contact with each other. After being stored inside, one is placed in a bag. That is, 6% by weight of carboxymethyl cellulose, the salt-resistant water-absorbing gel of Example 1 of the present invention (trade name:
Aquaric C3) 250g of water with 10% by weight added
e After storing 200 g of a mixture of ammonium nitrate and ammonium chloride at a weight mixing ratio of 1.5:1 in separate bags, the inner volume was 500.
Place both people in the crn3 bag and seal it.

When used as a coolant, each bag containing the water and ammonium salt mixture is shocked and broken, the two begin to come into contact and the ammonium salt mixture gradually dissolves in the water, resulting in its function as a coolant. Demonstrate gradually. Even if the ammonium salt is dissolved in water, the viscosity of the water is increased by the salt-resistant water-absorbing gel, so the viscosity of the water remains almost the same as before the ammonium salt was dissolved. Therefore, the disadvantage that the viscosity of water rapidly decreases as a result of the rapid dissolution of the ammonium salt as in the conventional example, and therefore the time for practical use as a coolant is shortened, is avoided. That is, since the ammonium salt mixture continues to gradually dissolve, it can be used as a coolant during this period. Also, since the viscosity of water remains high and does not change, its thermal conductivity is lower than that of water with low viscosity, so the heat transfer coefficient is also small, which means that it can be used as a coolant for a longer period of time. .

In addition, the high viscosity during use provides sufficient comfort during use.

〔Effect of the invention〕

As explained above, by using the present invention, which contains an ammonium salt and a salt-resistant water-absorbing gel and is formed of water that dissolves the ammonium salt, a refrigerant with a long cooling time and excellent practicality can be obtained. Obtainable.

Claims (1)

[Claims] A coolant formed of water containing an ammonium salt and a salt-resistant water-absorbing gel and dissolving said ammonium salt.