JPH0728829B2 - Heating composition for food and drink - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heating composition that is used for heating food and drink by utilizing the reaction heat generated by combustion.

(Prior Art) Conventionally, a method for heating food and drink through a metal container is well known, and for example, US Pat. No. 3,527,201 discloses that barium chromate is electrically heated by heating a nichrome wire. An example is shown in which an igniting agent made of boron is ignited and the heating agent made of barium chromate and aluminum burns with its energy to heat food and drink.

Further, U.S. Pat.No. 2,384,278 shows an example of heating food and drink by burning the heating agent by igniting an ignition line that reaches the heating agent in the heating agent storage portion from the outside,
This shows examples of various combustible heating agents as heating agents. For example, calcium silicide-red lead, antimony-
Examples of potassium permanganate, antimony-zinc-potassium permanganate, red lead-sulfur, etc. are shown.

Further, in British Patent No. 899441, metals such as aluminum, zinc, antimony and iron and their alloys and intermetallic compounds such as calcium silicide are used as reducing agents, and barium peroxide, iron oxide and copper oxide are used as oxidizing agents. Inorganic oxides and peroxides such as manganese dioxide and chromate and permanganate are shown, and the amount of heat can be controlled by adding non-explosive inactive substances and changing the compounding ratio as necessary. An example is shown.

(Problems to be Solved by the Invention) In the examples of these heating agents, when the heating agent is used for heating food and drink, the heating agent may be melted by heat and flow out of the container to cause a fire. . In addition, there is a problem that the volume of the heating agent becomes too large to sufficiently heat the food or drink by controlling so as not to heat melt.

Further, since it is not easy to ignite the heating agent, there is a problem that a large amount of the ignition agent has to be used and that the compound must be prepared by using a harmful metal or its compound.

(Means for Solving the Problem) As a result of repeated studies to solve the above problems, the present inventors have invented a heating agent composition suitable for heating food and drink.

That is, the present invention is a combustible heating agent for heating foods and drinks through a metal container, which is substantially a) copper oxide powder 30 to 55% by weight b) silicon iron powder 5 to 40 〃 c) iron powder 20 to A heating composition for food and drink, comprising a mixture of 55 〃.

The heating agent for food and drink of the present invention is accompanied by a large amount of heat when the silicon iron powder and the iron powder deprive the oxygen of copper oxide to undergo a combustion reaction, and a metal container such as iron, aluminum or copper is used. Heating is performed via.

Further, since the temperature of the exothermic agent exceeds 1000 ° C., it is possible to control the heat transfer by providing a heat insulating material layer or the like between the metal and the exothermic agent.

The copper oxide used in the present invention may be an industrial one that is generally commercially available, but a low-purity one may smell when burned due to the fact that it contains sulfur and the like, so 98% is preferable. The above-mentioned purity is preferable.

The compounding amount of the copper oxide powder is used in the range of 30 to 55% by weight. If it is less than 30% by weight, it is difficult to ignite with a small amount of igniting agent, and if it exceeds 55% by weight, the heating agent may melt during combustion and flow out from the heating device etc., which is dangerous. is there.

Further, it is desirable that the particle size of the copper oxide powder is 70 μm or less, and if it exceeds that, it becomes difficult to ignite with a small amount of ignition agent.

The silicon iron powder of the present invention is then used in the range of 5-40% by weight. When the content of silicon iron powder is less than 5% by weight, the amount of heat generated per unit volume of the heating agent composition becomes small, and the volume of the heating agent becomes too large to heat the food or drink to a target temperature. On the other hand, if it exceeds 40% by weight, the heating agent may be melted during combustion and flow out from a heating device or the like, which is dangerous.

The particle size of the silicon iron powder is preferably 70 microns or less, and if it exceeds that, the reactivity of the silicon iron powder is lowered and a sufficient amount of heat generation cannot be obtained.

The iron powder of the invention is then used in the range 20-55% by weight. If the iron powder content is less than 20% by weight, the heating agent may melt during combustion and flow out from the heating device, which is dangerous. Further, if it exceeds 55% by weight, a sufficient heat generation amount cannot be obtained.

The particle size of the iron powder is preferably 150 microns or less, and if it exceeds that, the reactivity of the silicon iron powder decreases,
Sufficient heat generation cannot be obtained.

The heating composition for food and drink of the present invention is obtained by uniformly mixing copper oxide powder, silicon iron powder, and iron powder. These three
In addition to the components, a small amount of metal-based powder or an inert substance can be added to control the combustion reaction, but it is added so as to be kept to the minimum to ensure ignitability. The mixed exothermic composition is used in the form of powder, or is wrapped in a metal foil or the like, or is pressed and used.

Ignition of the heating agent composition for food and drink of the present invention is carried out with a small amount of an ignition agent. Unlike the heating agent of the present invention, the ignition agent is easily ignited by a weak fire source, so it is desirable to use a small amount thereof. The igniting agent is placed in contact with the heating agent and can be easily ignited by electric heat or a squib.

(Operation) The copper oxide powder in the heating agent for food and drink of the present invention does not easily ignite with general flames such as lighters and matches, but it is easily ignited by using a small amount of igniting agent, and therefore it is easy to handle. It is a very safe heating composition.

In addition, it was confirmed that the food and drink heated in the heating container using the heating agent composition of the present invention was relatively difficult to cool.

4. Examples Hereinafter, the present invention will be described based on Examples 1 to 12 and Comparative Examples 1 to 6.

(Examples 1 to 12) In the container having the structure shown in FIG. 1, the container side wall 9, the bottom cover 8 having the combustible heating agent storage portion, and the upper cover 6 are made of aluminum, and the outer diameter of the container side wall 9 is 65 mmφ. 90 mm in length, the bottom lid 8 with combustible heating agent storage part has an inner diameter of 40 mmφ,
It was 50mm and 180cc of sake was packed inside the container. As the flammable heating agent 1, 25 g of the composition shown in (Table-1) was used after being wrapped in aluminum foil. The copper oxide used here had a particle size of 300 mesh pass, the iron powder had a particle size of 200 mesh pass, and the silico-iron had a particle size of 100 mesh pass. Silica sand is used for the heat insulation layer 2a and the heat insulation layer 2b, and for the squib 3a, a carbon fiber bundle with a small diameter is made of silicon iron with an average particle diameter of 30μ and lead trioxide with an average particle diameter of 3μ at a weight ratio of 3: 7. The mixture mixed in a ratio is attached with nitrification cotton as a binder, and the average particle size is
A mixture of 30μ silicon iron, lead trioxide having an average particle size of 3μ, 200 mesh pass manganese dioxide and 200 mesh pass iron powder in a weight ratio of 20.0%, 46.7%, 16.6% and 16.7%. 0.25 g of nitrite was used as a binder and applied with the ignition powder 3b. In addition, a tin plate with a 3 mmφ hole in the center was used for the lid 4 of the heat-insulating layer, and the squib 3a was lengthened 3 mm from the hole and ignited with a match flame from the tip, and the following 3 items were set. The evaluation was carried out by paying attention.

1). Evaluation item (A) shows ignitability.

○ indicates good ignition, × indicates poor ignition.

2). Evaluation item (B) is 20 ℃ water in the container, 180ml is T
It is the amount of heat required to heat up to ℃, and it is calculated by the following formula.

(B) ° C = T-20 3). In the evaluation item (C), 25 g of the exothermic agent was molded into a cylindrical shape of 32 mmφ, and it was observed whether or not it was melted when burned in air.

○ means good without melting, × means bad due to melting.

The results are shown in (Table-1).

(Comparative Examples 1 to 6) The composition of the combustible heating agent is shown in (Table-2). Other than that, the evaluation was performed under the same conditions as in the examples. The results are shown in (Table-2).

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention, wherein FIG. 1 (A) is a longitudinal sectional view and FIG. 1 (B) is a plan view. In the figure, 1 is a combustible heating agent, 2a and 2b are heat insulating layers, 3a is a squib, 3b is an ignition agent,
4 is a lid for a heat insulating layer, 5 is liquid food and drink, 6 is a top lid, 7 is a pulling metal fitting for opening, 8 is a bottom lid having a combustible heating agent storage section,
Reference numeral 9 denotes a container side wall, respectively.

Claims (2)

[Claims] 1. A combustible heating agent for heating food and drink through a metal container, wherein the combustible heating agent is substantially a) copper oxide powder 30 to 55% by weight b) silicon iron powder 5 to 40. 〃 c) A heating composition for food and drink, which comprises a mixture of 20 to 55 〃 of iron powder. 2. The heating composition for food and drink according to claim 1, wherein the particle size of copper oxide and silicon iron is 70 microns or less and the particle size of iron powder is 150 microns or less.