KR101505517B1 - Thermogenic composition - Google Patents

Abstract

A method for producing a heat generating material containing aluminum powder which generates heat by mixing a certain amount of sodium hydroxide (NaOH) as an exothermic reaction product with calcium oxide (CaO) (calcium oxide) and aluminum (Al) .

Description

[0001] THERMOGENIC COMPOSITION [0002]

The present invention relates to a method for producing an exothermic agent containing aluminum powder, and more particularly, to a method for producing an exothermic material containing sodium hydroxide (NaOH) as an exothermic reaction product in a mixture of calcium oxide (CaO) ) In a predetermined amount and reacting with water to generate heat.

In general, a heating element capable of easily heating and cooking foods without operating a heating device such as a burner or a heater is very useful when performing operations or moving to soldiers or mountain climbers, or in emergency situations. In addition to heating food, And it can be commercialized as a heating material for a heating furnace, so its usefulness can be very great.

The heating elements developed so far consist of several metals and metal oxides or metal salts. For example, it may be composed of a mixture of calcium oxide (CaO), potassium hydroxide (KOH), calcium chloride (CaCl 2) and magnesium chloride (MgCl 2) Electrolyte materials (NaCl, KCl, MgCl 2, FeCl 2, NiCl 2) are mixed to form a heating element.

Such a heating element can heat or cook food by heating the packaged food without using heating means such as a burner or a heater, using the heat generated when contacting with water or an electrolytic solution.

However, in general, such a heating element has various drawbacks, for example, it is difficult to store for a long period due to the hygroscopicity of a heating element, and is vulnerable to impact. Especially, when stored effectively for a long period of time, And it is inefficient according to the passage of time. This will be described in detail as follows.

Korean Patent Laid-Open Publication No. 2000-58524 discloses that 300 ml of water is heated to 73 to 100 ° C by contacting a calcium phosphate solution (H 3 PO 4) in an amount of 2 to 35% by weight with calcium oxide, 2 O 5) caused by the intense hydration reaction caused by the intrinsic nature of the lime. This causes the explosive exothermic reaction during the distribution process. In addition, when the phosphoric acid solution is discarded, the ecosystem is eutrophicated Which is not preferable to the environment because it is an incompatible method.

Japanese Patent Application Laid-Open No. 62-9151 discloses a method in which an aqueous solution of inorganic salt is contacted with quicklime to heat 180 mL of beverage to 50 ° C or higher. This method has the disadvantage of being able to avoid freezing of the aqueous solution during cold weather but being heated to a temperature insufficient to cook the food.

U.S. Patent No. 5,205,277 discloses three heating packages, that is, a bed of quicklime to generate heat at the lower end, an aqueous solution of acetic acid (CH 3 COOH), water and sodium chloride in the middle layer, and an aqueous sodium chloride solution Thereby causing the heat of reaction of hydration of quicklime upon rupture of the solution bubbles to cause secondary reaction heat due to the solution at the upper part. However, this method can obtain a relatively high temperature, which is a useful method in cold weather or cold weather, but it has a disadvantage that it is economically expensive.

U.S. Patent Nos. 4,522,190, 5,117,809, and 5,593,792 are heat generating bodies composed of a super-corrosive metal alloy powder using polyethylene, which is a porous polymer, as a heating package for heating foods or foodstuffs. Although a relatively high heat can be obtained by contacting an ultra-corrosive magnesium-iron alloy with an electrolytic solution such as seawater, there is a weak point that a large amount of hydrogen gas with high flammability and explosion risk is generated, and a magnesium- It has a vulnerability that responds very slowly.

Korean Patent Application No. 1999-46130 has developed the same magnesium-iron superabsorbent alloy as U.S. Pat. Nos. 4,522,910 and 5,117,809 as another type of heating package to improve portability and maximum heating temperature, And the vulnerability of the explosion and the fire that are very slow to respond.

On the other hand, the problem that arises when soldiers or mountain climbers carry out operations or move is the speed with which the weight and the volume of the hand-held article are quick. Therefore, it is very important to reduce the weight and volume of the heating element used in a special situation, and rapid heating for saving time is also very important. In addition, the amount of water required to activate the heating element is also very important. In other words, it is not easy to obtain water that can be drunk in the field, and the amount of water in the watercraft that the soldiers are carrying is limited, so it is also important to reduce the amount of water to activate the heating element.

The inventor of the present invention has conducted intensive studies to solve the above-mentioned problems, and as a result, the present inventors have found that it is possible to control the exothermic temperature by mixing different meshes and generate a high exothermic temperature with a small amount Thereby completing the invention.

Korean Patent Publication No. 2000-58524 Japanese Patent Laid-Open Publication No. 62-9151 U.S. Patent Nos. 4,522,190, 5,117,809, and 5,593,792 Korean Patent Application No. 1999-46130

The present invention relates to a process for producing a polyurethane foam, which comprises mixing aluminum powder with different sizes of heat-generating materials to control a desired heat-generating temperature and a heat-generating time, and heating a desired temperature to a desired temperature, And an object of the present invention is to provide a method for manufacturing a heat generating material.

(Al) powder 300-350 mesh of the present invention for achieving the above object, 16-20 weight% of aluminum (Al) powder, 53-57 weight% of aluminum (Al) powder, 20- 24 weight% of calcium hydroxide (CaO) NaOH) in an amount of 3 to 7% by weight,

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(a) mixing 26.5 to 28.5% by weight of aluminum (Al) powder 180 to 220 mesh, 16 to 20% by weight of aluminum (Al) powder and 20 to 24% by weight of calcium hydroxide (CaO) in a primary agitator ,

b) mixing and stirring further 26.5 to 28.5% by weight of aluminum (Al) powder with 180 to 220 mesh by weight in the mixture stirred in step a)

c) adding 3 to 7% by weight of sodium hydroxide (NaOH) to the mixture stirred in step b), stirring for 1 to 2 hours,

d) sealing and packing 65 to 68 g of the mixture in the nonwoven fabric in the step c).

The heating method of the present invention has the effect of rapidly raising the temperature to 110 ° C or higher after the exothermic reaction even in a small amount and maintaining the temperature close to 110 ° C for 20 minutes or longer so that a large amount of heating elements are not used, The weight and the volume are not increased.

Further, by mixing the aluminum powder with different particle sizes, it is possible to easily control the heat generation temperature and time.

The exothermic composition of the present invention is formed by mixing a certain amount of sodium hydroxide (NaOH) powder with a mixture of aluminum (Al) powder and calcium oxide (CaO) powder.
The exothermic composition containing aluminum powder according to the present invention comprises 16 to 20% by weight of aluminum (Al) powder 300 to 350 mesh, 53 to 57% by weight of aluminum (Al) powder 180 to 220 mesh, 20 to 24% by weight of calcium hydroxide %, Sodium hydroxide (NaOH) 3 to 7% by weight
Further, in the method for producing a heat generating material containing aluminum powder of the present invention,

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(a) mixing 26.5 to 28.5% by weight of aluminum (Al) powder 180 to 220 mesh, 16 to 20% by weight of aluminum (Al) powder and 20 to 24% by weight of calcium hydroxide (CaO) in a primary agitator ,

b) mixing and stirring further 26.5 to 28.5% by weight of aluminum (Al) powder with 180 to 220 mesh by weight in the mixture stirred in step a)

c) adding 3 to 7% by weight of sodium hydroxide (NaOH) to the mixture stirred in step b), stirring for 1 to 2 hours,

d) hermetically sealing 65 to 68 g of the mixture in the nonwoven fabric in the step c).

When a certain amount of water is added to the exothermic agent composed of calcium oxide and aluminum powder, the calcium oxide powder reacts with water to generate reaction heat.

 In the present invention, a mixture of a calcium oxide powder and an aluminum powder is mixed with a certain amount of sodium hydroxide to cause a reaction heat with the calcium oxide powder reacting with water. At the same time, a certain amount of sodium hydroxide powder reacts with the aluminum powder, A temperature of about 110 < 0 > C is reached and the temperature is maintained for about 15-25 minutes.

The heating time and the temperature can be controlled by suitably controlling the ratio of the aluminum (Al) powder of 180 to 220 mesh and the aluminum (Al) powder of 300 to 350 mesh at the time of manufacture.

That is, the smaller the particle diameter of aluminum used, the faster the reaction rate. However, if the particle size is too small, handling becomes difficult.

Therefore, it is preferable to use aluminum having a particle size of 210 mesh and 330 mesh, which is preferable.

The sodium hydroxide used in the present invention preferably has a purity of 98% and a particle size in the range of 150 mesh to 250 mesh.

The aluminum powder used in the present invention has an Al metal purity of 99.8% or more, an apparent density of 0.7 to 1.2 g / cm < 3 > and a particle size distribution in the range of 200 mesh to 350 mesh in consideration of ease of handling, .

Claims (2)

delete (Al) powder 16-20% by weight of 300-350 mesh, aluminum (Al) powder 180-220 mesh 53-57% by weight, calcium hydroxide (CaO) 20-24% by weight, sodium hydroxide (NaOH) 3-7% A method for producing a heat generating agent,
(a) mixing 26.5 to 28.5% by weight of aluminum (Al) powder 180 to 220 mesh, 16 to 20% by weight of aluminum (Al) powder and 20 to 24% by weight of calcium hydroxide (CaO) in a primary agitator ,
b) mixing and stirring further 26.5 to 28.5% by weight of aluminum (Al) powder with 180 to 220 mesh by weight in the mixture stirred in step a)
c) adding 3 to 7% by weight of sodium hydroxide (NaOH) to the mixture stirred in step b), stirring for 1 to 2 hours,
d) encapsulating 65 to 68 g of the mixture stirred in the step c) in a nonwoven fabric.