JPS62290456A - Portable 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 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a portable coolant capable of reacting with a chemical to obtain a cooling effect.

BACKGROUND ART Poval sealed in a waterproof bag is widely used as a portable coolant used to cool the head or cool a cooler box while fishing. This product is used after being frozen, but freezing takes time, and if it is not constantly frozen, it is useless in emergencies, and it cannot be used as a coolant in places where a freezer is not available. Ta. In addition, since it hardens when frozen, it cannot be freely deformed and used to fit the body, and there are limits to how it can be used.

Recently, a reactive portable coolant consisting of urea, ammonium nitrate, and water has been commercially available, but it is difficult to obtain a cooling temperature of 5°C or lower, and the retention time at a cooling temperature of below room temperature is also short. It took only 20 to 30 minutes, and was not practical. In addition, a reactive portable coolant using decahydrate of soda carbonate has been developed, but decahydrate of soda carbonate dissolves in crystal water at temperatures close to 30°C, and the temperature in the atmosphere is low. It exhibits efflorescence and, conversely, deliquesces when exposed to high humidity, resulting in poor stability and the inability to store it for long periods of time, so it is currently not put into practical use.

Purpose of the Invention The present invention is a portable refrigerant that utilizes the endothermic reaction of chemicals and is useful even in emergencies.
Moreover, the object is to provide a coolant with good storage stability.

Structure of the Invention The portable coolant of the present invention comprises: a) sodium carbonate heptahydrate;
b) A reactant containing at least one of ammonium nitrate and ammonium chloride is separated and held in a container so that the two can be reacted in the container and used when desired.

That is, the present inventor focused on the existence of the heptahydrate salt of soda carbonate, which has rarely been used industrially in the past, and while investigating its properties, discovered that it is unique and significantly different from the case of the decahydrate salt of soda carbonate. The present invention has been achieved by discovering that the present invention is effective.

The technical reason for this is not clear, but when using sodium carbonate heptahydrate, it interacts with at least one of ammonium nitrate and ammonium chloride, and not only does it easily reach a temperature below the atmospheric temperature at room temperature, but also It can be stored without deterioration even at high temperatures of .degree. C. or higher, reacts stably with the above-mentioned reactants, and exhibits the desired cooling effect.

The ratio of the heptahydrate of sodium carbonate and the above-mentioned reactant used is not particularly limited, but the weight ratio of -i to 1:l to 3:
It is preferable to use a ratio of 1:1, and it has been found that if the reactant contains sodium nitrate, the cooling effect can be maintained more stably for a longer period of time.

The form of use of the coolant of the present invention is not particularly limited, but the container is formed into a double bag, the inner bag is filled with one of the drugs a) or b), and the other drug is placed inside the bag. It is easy to handle by enclosing it in a moisture-resistant outer bag.When formed into a double bag like this, when desired, the entire bag is rubbed to break the inner bag, and the drugs a) and b) can be reacted in the outer bag. The outer bag is generally preferably formed from a synthetic resin film or a laminate thereof, and the inner bag may be formed from resin-coated paper or the like.

Either of the drugs a) and b) may be contained in the inner bag, but the inner bag should contain b) so that the drug a), which is generally used in large amounts - heptahydrate of sodium carbonate, is located outside. It is easy to handle by enclosing the reactant.

In this case, cooling can be made more stable by adding a small amount of a solid desiccant such as silica gel that is inactive to the drugs a) and b) to at least one of the outer bag and the inner bag of the double bag. It has also been confirmed that the effect can be enhanced.

Example 1 200as
An outer bag of 60cm was formed, and a 140as
An inner bag of x80m was formed.

Pour the reactants into the inner bag in the proportions shown in Table 1, seal it, and place the
This sealed inner bag was placed in an outer bag into which the main ingredient was added in the proportion shown in the table, and the mouth of the outer bag was sealed to obtain a portable coolant.

Table 1: This portable coolant was crushed to break the inside, and the temperature on the surface of the outer bag was measured over time when the base agent and the reactant reacted inside the outer bag. The results are shown in Table 2.

Table 2 From the results, it can be seen that the portable coolant of the present invention easily cools down to 0° C. or lower at room temperature, and maintains the cooling effect of 15° C. or lower for more than 6 hours.

Example 2 In the same manner as in Example 1, the main agent and reactant having the composition shown in Table 3 were allowed to interact, and the temperature change over time was measured. The results are shown in Table 4.

Table 3 Table 4 From these results, it can be seen that the portable coolant of the present invention has an outside temperature of 4.
It can be seen that the cooling effect is stably exhibited even at high temperatures of around 0°C.

Comparative Example I NazCOz + instead of NazCJ' 71hO
When the same method as in Example 2 was carried out using 10HtO, it was found that when the outside temperature rose, Na was removed in the bag before use.
zCJ・10H20 became deliquescent and deteriorated, making it difficult to use.

Example 3 Using 100 g of base agent NazCOs 7Hz0 and 50 g of reactant NHmNOs,
A method similar to Example 1 was carried out, and temperature changes were measured at an outside temperature of 50°C. The results are shown in Table 5.

Table 5 From the results, it is clear that the portable coolant of the present invention has an outside temperature of 5.
It can be seen that even at 0°C, the cooling effect is stably exhibited without any change in quality.

It should be noted that even after use, the products of each example can be used as a coolant by cooling them in a refrigerator. If you cool it before and after, even if you leave it at room temperature, it will last 2~
Maintains that cooling temperature for a long period of 5 hours (
(maintained at least below 15°C). This seems to be because the crystallized water in the width of the product works effectively.

Effects of the Invention Since the portable coolant of the present invention obtains a cooling effect through the reaction of two types of chemicals, it can be used freely wherever and whenever desired, even when the outside temperature is 30°C or higher. A stable cooling effect can be easily obtained, and the coolant has excellent storage stability.

Claims (1)

[Scope of Claims] (1) A) a heptahydrate of sodium carbonate and b) a reactant containing at least one of ammonium nitrate and ammonium chloride are separated and held in a container, and when desired, both are stored in the container. A portable refrigerant characterized by being able to be used by reacting it. (2) The portable coolant according to claim 1, wherein the reactant includes sodium nitrate. (3) The weight ratio of sodium carbonate heptahydrate and the above reactant is 1
The portable coolant (4) container according to claim 1 or 2, which is used in a ratio of 1 to 3:1, is formed into a double bag, and the inner bag contains the above-mentioned components. Claims 1 to 3, wherein either one of the drugs a) or b) is enclosed, and the other drug is enclosed together with the inner bag in a moisture-resistant outer bag. portable coolant. (5) The portable coolant according to claim 4, wherein the outer bag is made of a synthetic resin laminate. (6) A portable coolant according to claim 4 or 5, wherein the inner bag is made of paper coated with resin. (7) The portable coolant according to any one of claims 4 to 6, wherein the inner bag contains the above-mentioned reactant, and the outer bag contains sodium carbonate heptahydrate together with the inner bag. . (8) The portable coolant according to any one of claims 1 to 7, wherein 20% by weight or more of the reactant is ammonium nitrate.