JPS63234082A - Portable cooling agent - Google Patents

Abstract

PURPOSE:To obtain a cooling agent utilized in cooling of a food or drink or control of temperature of the body, etc., by housing a powder of water-soluble and endothermic substance and powder of metal-containing salt through a thin film in an impermeable and flexible sealed vessel. CONSTITUTION:The aimed cooling agent obtained by housing (A) a powder of water-soluble and endothermic substance consisting of ammonium nitrate, urea, etc. and (B) a powder of metal-containing salt consisting of sodium sulfate.10 hydrate, etc., in an impermeable and flexible vessel such as a sealed plastic (polypropylene, polyethylene, etc.) film not so as to be blended each other using a film such as plastic film, etc., which is permeable and capable of breaking. the blend weight ratio of the component (A) with the component (B) is preferably about 1:1.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to a portable device that uses a substance that absorbs heat when dissolved in water, and is used for cooling foods and beverages, regulating body temperature, etc. Concerning coolant.

C. Conventional technology It is being used for cooling.

It can also be used to cool the feverish head of a sick person at home or in a hospital, or to regulate body temperature, or to reduce the heat in the summer when attending sports or at a construction site.

It is common practice to place a bag filled with ice on the head.

However, using ice to cool foods and the like has the disadvantage that the ice bulks up, and in the case of fruits and fish, they are easily damaged by their own weight and vibrations during transportation. or.

When placed on the head for medical purposes or to regulate body temperature during recreational activities, ice is block-shaped and angular, making it unstable on the head, making it difficult to use, especially in recreational activities or construction sites. was there.

Recently, a portable refrigerant package has been developed by Jobnson & J.O.
b, commercially available from NSON. This portable coolant consists of powdered material (the specific name is unknown) that dissolves in water and absorbs heat. It is placed in a large bag (container) and sealed.The small bag is broken and the water inside flows out into the large bag, and the surrounding area is cooled by the absorption of heat when the powder of the above-mentioned dissolved endothermic substance in the large bag dissolves in this water. It is something to do.

However, although this portable coolant is small and convenient to take out and use at any time, the cooling temperature is at least around -7℃, and moreover, it supplies water sealed in a sachet to the dissolved endothermic substance at once. Therefore, dissolution and endothermic reactions proceed rapidly, and the effect of cooling the contact surface below 0°C is 1
I could only last between 5 and 30 minutes.

[Problems to be Solved by the Invention] In view of these conventional circumstances, the present invention provides a device that is small and convenient for carrying and storing, can be easily used at any time, and maintains an excellent cooling effect for a long time. I can do it. Aims to provide portable coolant.

[Means for Solving the Problems] The portable coolant of the present invention contains a powder of a dissolved endothermic material that absorbs heat when dissolved in water, and crystals in a sealed, water-impermeable, recyclable container. It is characterized by containing water-containing metal hydrate salt powder using a water-impermeable breakable thin film so that they do not mix with each other.

The endothermic dissolved substance may be a known substance that absorbs heat when dissolved in water, such as ammonium nitrate, sodium thiosulfate, ammonium chloride, calcium chloride hexahydrate, urea, etc. A species or two or more species can be used.

In addition, as the metal hydrate salt, one that easily releases crystal water is preferable. For example, sodium sulfate decahydrate (NazS04
・10H20), potassium aluminum sulfate dodecahydrate (
KAI(SO4)2・12H20), ammonium aluminum sulfate dodecahydrate (AINH4(S04)・1
2H20), aluminum sulfate 18 hydrate (Ah(SOi
h48ToO), 77%NiumHv”) /< N(
A12 (NHs)2SOs .H2O) etc. (7) One type or two or more types can be used.

Further, the combination and mixing ratio of these two powders can be appropriately selected depending on the desired cooling temperature and cooling duration. Among these, a preferred combination is an example in which ammonium nitrate and urea powder is used as the dissolved endothermic substance powder, and sodium sulfate decahydrate powder is used as the metal hydrate powder. In general, a preferable mixing ratio of the dissolved endothermic substance and the powder of the metal hydrate is approximately tit in terms of weight ratio.

What are powders of soluble endothermic substances and powders of metal hydrates?

Before use, separate both powders with a water-impermeable thin film so that they do not mix. This thin film is water-impermeable, like a plastic film, to prevent crystallization water from penetrating, and can be broken before use. For example, this thin film is adhered to the inner peripheral surface of the container so as to divide it into two parts, and the powder of the dissolved endothermic substance and the metal are placed on both sides of the container, respectively. The hydrated salt powders may be stored separately, or one powder may be stored in a pouch made of a thin film, and this pouch may be stored together with the other powder in a container.

The container used to separately store the dissolved endothermic substance and the metal hydrate powder and to mix the two powders during use is necessary because an aqueous solution of ammonium nitrate or metal salt is ultimately produced.
A thick, water-impermeable container that can hold the water without leaking and that does not tear during handling is sufficient.A flexible bag-like container that allows the container to easily fit into the head when cooling the head, etc. The preferred material for the container and thin film is a plastic film such as polypropylene, polyethylene, or soft vinyl.

[Function J] In the portable coolant of the present invention, the dissolved endothermic substance powder and the metal hydrated salt powder are separated by a water-impermeable thin film in a container such as a bag so that they do not mix before use. The powders are stored separately, and when used, the thin film is manually broken from the outside of the container and both powders are mixed in the container. When both powders are mixed and come into contact, crystals form from the metal hydrate salt powder. As water gradually liberates and dissolves the dissolved endothermic substance powder,
The surroundings of the container are cooled by absorption of heat during this melting.

In the present invention, since the wood for dissolving the dissolved endothermic substance is supplied from the water of crystallization contained in the hydrated metal salt, the release of the water of crystallization from the hydrated salt progresses only little by little, and therefore the dissolution into the free crystallized water The dissolution of the endothermic substance and the endothermic reaction at that time can be sustained for a long time. When compared to conventional ice cooling or commercially available simple coolants, one coolant cools at -17°C if the volume of water or aqueous solution remaining at the end is the same.
A very low temperature can be obtained and the cooling effect can be maintained for a much longer time until the temperature reaches 0°C.

Furthermore, if at least one of the dissolved endothermic substance and the metal hydrate powder is mixed with a powder of a substance that thickens water such as sodium alginate or poval, or a powder of sodium acrylate called a polymer absorber, It is possible to maintain the cooling effect for a longer period of time.Furthermore, the larger the crystal grain size is used as the dissolved endothermic substance and metal hydrate powder, the longer the cooling effect lasts.

Furthermore, since powders are used for both the dissolved endothermic substance and the metal hydrate, the contact area between the two is large, and although crystal water is used, their release is relatively easy, and the cooling effect can be obtained from mixing the two powders. The time it takes for this to manifest is also extremely short.

[Example] Crystal grain size is approximately 1.5 mm in a thin polypropylene pouch
1.5 parts by weight of powdered sodium sulfate 1O aqueous salt was added thereto and the mixture was sealed. This small bag was placed in a large thick polypropylene bag, and 1 part by weight of ammonium nitrate powder with a crystal grain size of about 1 and 0.5 part by weight of urea powder was mixed therein.
Seal the big bag.

Next, use your hands to tear open the small bag inside the large bag.

Sodium sulfate decahydrate powder was mixed with sodium nitrate powder and urea powder. Immediately after mixing, the surface temperature of the bag began to drop, reaching a minimum temperature of -17°C after about 1 minute.

When this bag was kept at room temperature of 20°C, it took about 3 hours for the surface temperature of the bag to rise to 13°C.

Also, when kept at room temperature of 10℃, 1 surface temperature is 15℃.
It took about 7 hours to rise to ℃. Collectively, an aqueous solution remained in the large bag in which all the powder was nearly dissolved.

[Effects of the Invention] According to the present invention, it is possible to provide a coolant that is small, convenient for carrying and storage, and can be easily used at any time. Since crystal water is used, the excellent cooling effect can be maintained for a long time.

Claims (2)

[Claims] (1) In a sealed, water-impermeable, flexible container, a powder of a dissolved endothermic substance that absorbs heat when dissolved in water and a powder of a metal hydrate containing water of crystallization are placed in a water-impermeable container. A portable coolant characterized by being housed in a breakable thin film so that they do not mix with each other. (2) The portable coolant according to claim (1), wherein the dissolved endothermic substances are ammonium nitrate and urea, and the metal hydrate is sodium sulfate decahydrate.