JPH10298542A - Food-heating agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject heat-generating agent giving a calorific power comparable to quicklime using reduced iron powder causing moderate exothermic reaction by compounding reduced iron powder, activated carbon powder, water and an inorganic salt at respectively specific ratios. SOLUTION: This agent is composed of (A) 74.5±5% of reduced iron powder (preferably black reduced iron powder), (B) 9±3% of activated carbon powder, (C) 11±2% of water and (D) 5±1% of an inorganic salt, generates heat to raise the temperature to >=105 deg.C and keeps the temperature for >=8 min when brought into contact with air. The component D preferably contains >=50% of MgCl2 , MgBr2 , CaCl2 , CaBr2 , CaI2 , LiI, NaI, KI, LiSCN, NaSCN and/or Ca (SCN)2 .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food heating agent intended to heat retort foods, which have been remarkably developed in recent years, by safely heating them in a place without a firearm.

[0002]

2. Description of the Related Art Heretofore, there has been a container or the like containing sake having a heating function. In recent years, general foods with similar functions have been circulating. The heating units used in these devices all utilize reaction heat generated by pouring quicklime into water.

Conventionally, the use of a heat generating agent using reduced iron powder has been mainly for cairo, and there have been many proposals for inventions for suppressing heat generation (see, for example, JP-A-58-19255). In recent years, there have been proposals for use in hair coloring (see, for example,
-212504).

[0004]

[Problems to be Solved by the Invention] However, the above method has the following problems. In the method using quick lime, the reaction is intense at the time of handling, and there is no problem in the case of sake and the like, since adults handle it, but there is also a danger in the case of general foods, which can be handled by young people. On the other hand, in the conventionally used method of using reduced iron powder as a heat generating agent, the heat generation temperature is low, and it stops at 102 ° C. even when the temperature rises, so that it was not used for heating general foods.

[0005] Accordingly, an object of the present invention is to provide a heating agent which uses reduced iron powder having a mild exothermic reaction and can generate a calorific value equivalent to that of quicklime.

[0006]

In order to achieve the above object, the present invention employs the following technical means.
That is, we carefully selected raw materials and searched for inorganic salts. Pure black reduced iron powder was used as the reduced iron powder, and excellent products (Shirasagi A, C; manufactured by Takeda Pharmaceutical Co., Ltd.) were used as the activated carbon powder.

The oxidation of iron has long been thought to proceed faster with salt water. Thus, it is clear that water is required as a catalyst in addition to salts in oxidation of iron.
Water molecules exist as water of crystallization in the salt, but generally decompose and evaporate at 102 ° C. or higher. But,
If the salts have a large ionic atmosphere, that is, if the atomic ions or molecular ions are large in atomic weight or molecular weight, it is considered that they contain water molecules even at 102 ° C. or more. As a result of repeating the experiment based on this idea, the next atomic ion or molecular ion was selected. ^Mg ++ is a cation, ^{Ca ++,} the anion ^I -, SCN ^- a. These ions or the ions that combine with them are Li ⁺ , Na ⁺ , K ⁺ , Cl ⁻ and Br ⁻ ,
The combination of the cation and the anion is arbitrary.

[0008]

The salts selected as described above contain water molecules and maintain an exothermic catalytic reaction even when the temperature exceeds 105 ° C. by being mixed with a predetermined raw material. This is 10
Even when the temperature exceeds 5 ° C., it can be confirmed from the fact that steam is actively evaporating from the heating agent. Also, the maximum temperature reached 12
Some compositions exceed 0 ° C.

[0009]

EXAMPLE In this example, the method of experiment in the present invention will be described with reference to the composition of Example 3 in Table 1 as an example of the heat generation state. The amount of each composition is black reduced iron powder 3
7.5 g (75%), activated carbon Shirasagi A 5.0 g (10
%), Water 5.5 g (11%), CaCl ₂ 2.0 g (4
%).

[0010]

[Table 1]

A flat bag made of a nonwoven fabric made of a breathable polyethylene (75 mm × 90 mm), which is referred to as a longitudinal cut, called an inner bag, and a flat bag made of a polyethylene / aluminum laminated film (10
0 mm x 120 mm, long-length cut, called outer bag) and a welder. Also, black reduced iron powder and activated carbon Shirasagi A are mixed in a beaker, CaCl ₂ is put in another beaker and dissolved in water.

First, the inner bag is placed in the outer bag with the cut edge in the same direction, and the iron powder mixture is placed in the inner bag. Next, C
An aCl ₂ aqueous solution is added, and the cut end of the inner bag is quickly taken out about 15 mm from the cut end of the outer bag, and the cut end of the inner bag is sealed. The inner bag is then quickly and completely inserted into the outer bag, and the outer bag is similarly sealed while removing the air in the outer bag by pressing. The operation after the addition of the CaCl ₂ aqueous solution must be completed within 7 seconds at the latest in order to minimize heat loss. Next, the bag containing the heating agent is rotated and kneaded for about 15 seconds to mix the components well.

Next, two thick medium- and low-pressure polyethylene nets having a size of 120 mm × 140 mm are placed on a laboratory bench in a room adjusted to a room temperature of 20 ° C., and an outer bag of a bag containing a heating agent is placed thereon. Take out the inner bag and put it on. A thermometer is placed on the thermometer so that the sensing part is in the center, and a cloth is further placed on the thermometer so that the inner bag is completely hidden.
In this state, measurement of the exothermic temperature starts.

From the initial temperature of 20 ° C., it reaches 80 ° C. after 4 minutes. During this time, the temperature rise is the steepest. After that, it became a little slow and reached 105 ° C 12 minutes after the beginning,
Six minutes later, it reaches the maximum temperature of 121 ° C. Part 5
After a minute the temperature drops to 105 ° C.

Tables 1 and 2 show Examples (12 examples) in which the composition was changed and the same procedure was carried out, and Comparative Examples (2 examples) containing no inorganic salt according to claim 1.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

The effects of the present invention are shown in Table 2 below.
In this example, the composition of Example 12 is described as an example.

[0019]

[Table 2]

Inner bag (120 mm × 1) of the same material as in the embodiment
70mm) and an outer bag (130 mm x 180 mm)), 112.5 g (75%) of black reduced iron powder, 7.5 g (5%) of activated carbon Shirasagi A, 7.5 g (5%) of activated carbon Shirasagi C,
16.5 g of water (11%), 3 g of CaCl ₂ (2%),
NaSCN 1.5 g (1%) and NaCl 1.5 g (1
%) Are packed in a bag by the same operation as in the example. Next, 300 g of cooked rice is put in a polyethylene film bag (120 mm × 170 mm) and sealed.

On the same experimental table as in the example, 150
Two nets of the same material as in the example of the example of 200 mm × 200 mm are put on each other, and a cloth bag of 180 mm × 230 mm (longitudinal release portion) is prepared thereon. In addition, 130mm x 180mm
Prepare a thicker cloth.

First, as in the embodiment, the outer bag of the heating agent-containing bag is cut open, and the inner bag is taken out and put in the cloth bag. Next, the thick cloth is spread on the inner bag, and the bag containing the cooked rice is cut in one corner, a hole of about 5 mm is made, and the bag is put into the cloth bag so as to be on the thick cloth.

After standing for 20 minutes, the rice bag was taken out and opened, and the rice was taken out of the bag and the temperature distribution was measured. The temperature at the corner was 66 ° C., rising toward the center, and the lower part of the center (the portion in contact with the inner bag) was 71 ° C. You get enough temperature to eat.

Claims (2)

[Claims] 1. The composition ratio of reduced iron powder is 74 ± 5%, powdered activated carbon is 9 ± 3%, water is 11 ± 2%, and inorganic salts are 5 ± 1%, and the heat generation temperature upon contact with air is 105 ° C. or more. A food heating agent, wherein the temperature duration is 8 minutes or more. 2. Claims 1. MgC for inorganic salts
l ₂ , MgBr ₂ , CaCl ₂ , CaBr ₂ , Ca
I ₂ , LiI, NaI, KI, LiSCN, NaSC
_2. The food heating agent according to claim 1, wherein the heating agent contains 50% or more of N, or Ca (SCN) ₂ .