JPH0353349B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing an exothermic composition that generates heat upon contact with oxygen in the air.

(Conventional Methods) Conventionally, methods for producing exothermic compositions by chemical reactions of metallic iron can be roughly divided into the following two methods. Namely, (1) a method in which each component of metallic iron, sodium chloride, activated carbon, water, and a filler is uniformly mixed and prepared, filled into a breathable packaging material, and then sealed in an airtight packaging material. (2) A composition containing metal iron and water among the components of metal iron, sodium chloride, activated carbon, water, and a filler is separated and filled into an air-permeable packaging material, and then this is airtight. Method of encapsulating in packaging material.

(Problems to be Solved by the Invention) Among the above-mentioned conventional methods, (1) involves preparing in advance a composition in which metallic iron, sodium chloride, activated carbon, water, and a filler are uniformly mixed. This composition generates heat immediately upon contact with air. Therefore, it is necessary to prevent the composition from coming into contact with air from the time the composition is manufactured until it is filled into a breathable packaging material. For this reason, the composition is usually manufactured in a closed device in which the air is replaced with nitrogen gas, and the air in the device is also replaced with nitrogen gas until the packaging material is filled. This has the disadvantage that the device becomes complicated and the manufacturing cost of the device is also high.
Furthermore, since a large amount of nitrogen gas is used during manufacturing, it is expensive and requires exhaust equipment to prevent nitrogen gas from leaking into the working environment.

In method (2), all the ingredients are not mixed,
In particular, since the metal iron and water are separated, they do not generate heat when they come into contact with air, but since they are separated and filled into breathable packaging materials, the structure of the breathable packaging material becomes complicated. There are drawbacks. That is, during manufacturing, a single bag of packaging material must be provided with two separate bag sections, each of which must be simultaneously filled with a measured amount. Furthermore, the separated parts of the two separated bags must be easily removed to form one bag. Unlike method (1), this method does not require any measures to avoid contact with air during production, but it has the disadvantage that the packaging material becomes complicated.

Furthermore, the heat-generating composition produced by this method requires the user to remove the separated portion between the two bags and mix the two bags before use, which is not convenient for the user.

The present invention does not require a nitrogen gas displacement sealing device,
The object of the present invention is to provide a simple and economical method for producing a heat-generating composition that does not require a packaging material with a complicated structure.

(Means for Solving the Problems) The present invention provides a method for producing a heat-generating composition comprising metallic iron, sodium chloride, activated carbon, water, and a filler. (a) A mixture of sodium chloride, activated carbon, water, and a filler prepared in advance and (b) prepare a certain amount of each of the metal irons, put both of them into one container, immediately fill one chamber of air-permeable packaging material from the container, and then pack the packaging material in an airtight package. It is characterized by being encapsulated in the material.

In the present invention, a homogeneous mixture of other components except metallic iron is prepared in advance. This can be easily produced by sprinkling or spraying a mixture of activated carbon and filler with sodium chloride and, depending on the formulation, a solution of the filler dissolved in water. Since this mixture does not generate heat even when it comes into contact with air, it does not require any equipment or operations such as nitrogen gas replacement. This mixture can therefore be prepared in large quantities and stored in plastic bags to prevent loss of moisture. During production, this mixture and metal iron are individually weighed in fixed amounts, and both are put into a container, which is immediately filled into a single chamber of air-permeable packaging material, and then this filling is The exothermic composition is obtained by encapsulating it in an airtight packaging material. Therefore, the amount of the mixture (a) and metal iron (b) charged into the container is the amount for one packaging material. Also, the mixture (a) and the metallic iron (b) can be charged into the container simultaneously or sequentially.

If the material is once placed in the container and then filled into the packaging material, it is easy to fill the material into the packaging material. Since the materials are mixed at different times, the materials are mixed uniformly.

Furthermore, when filling these materials, in order to mix the mixture of activated carbon, sodium chloride, water, and filler with metal iron, for example, obstacles are placed on the way to the container or packaging material so that they collide and mix. , the filling device can also be devised.
In addition, in the manufacturing method of the present invention, the mixture and metal iron are mixed immediately before being filled in the air-permeable packaging material, and the time from filling until the mixture is sealed in the airtight packaging material is also short. It is a short time. Therefore, although there is some contact with air during this period, production can be performed without generating heat.

In the conventional method described above, even when nitrogen gas replacement is performed, the hopper container and the like that supply the exothermic composition reach a high temperature that cannot be touched by hand. This is considered to be due to the fact that the original heat generating performance of the heat generating composition is not maintained and there is a large loss due to heat generation during production. On the other hand, according to the present invention, as detailed above, there is no loss and a heat generating composition having the original performance can be obtained.

Furthermore, in the conventional method (1), as well as the loss of heat generation, the heated composition becomes a solid and is mixed in the composition. These exothermic compositions are originally used for the purpose of keeping people warm by applying them to the human body.
Mixing stiffness may cause discomfort or pain, which is not desirable. According to the production method of the present invention, an excellent heat-generating composition that is completely free of hardness and soft even when applied to the body can be obtained.

Oxygen absorbers exhibit a reaction system similar to that of exothermic compositions, but in this case, the reaction is slow and does not generate heat, and their useful life is long. on the other hand,
In the case of the exothermic composition of the present invention, the reaction occurs rapidly in a short period of time, and although there are many similarities in principle, the two are very different in detail. For example, in the case of oxygen absorbers, it is not necessary to produce all raw materials in the presence of an inert gas such as nitrogen gas. In the present invention, if metallic iron is used that has been coated with sodium chloride in advance, the exothermic temperature decreases, the exothermic properties deteriorate during storage, and the composition loses its characteristics as an exothermic composition. Therefore,
As in the present invention, sodium chloride must be prepared in advance with something other than metal iron.

The heat-generating composition produced in the present invention contains metallic iron as a main component, and this metallic iron can be in powder form such as reduced powder, electrolytic powder, sprayed powder, or ground powder. In general, particles with an average particle size smaller than 50 mesh are suitable, and even if they are not necessarily of high purity, they may contain impurities to the extent that the effects of the present invention are not impaired. can include cast iron powder. In addition, as a filler used in the composition of the present invention, sodium silicate is used because it can maintain quality and performance during storage, generate heat at a constant temperature for a long time, and eliminate the need for kneading or shaking during that time. Hydrate salts can be used. In addition, diatomaceous earth, wood flour, raw ash, calcium sulfate, acid clay, zeolide, etc. can be used as fillers, and the use of these materials improves the fluidity and flexibility of the exothermic composition. It also feels good when applied to the body, and provides smooth heat generation. In addition, water-absorbing polymers can also be used for the purpose of absorbing water and stably retaining it. When a water-absorbing polymer is used, even if pressure is applied to the exothermic composition, water can be stably retained without separating, and the reaction of the exothermic composition is not affected at all. Examples of this water-absorbing polymer include CMC type, starch-polyacrylonitrile hydrolyzate, starch-polyacrylate crosslinked product, saponified vinyl acetate-methyl acrylate copolymer, polyacrylonitrile hydrolyzate,
Cross-linked sodium polyacrylate etc. can be used.

As described above, the heat-generating composition of the present invention is filled into a breathable packaging material. This packaging material controls the contact of the composition with oxygen and also prevents the composition from leaking out. Therefore, the packaging material needs to be one that does not allow the mixture of the composition to escape to the outside and allows a suitable amount of air (oxygen) to pass through.
This packaging material desirably has uniform air permeability throughout when the heat-generating composition is filled and packaged. Packaging materials that have varying degrees of air permeability or that have local air permeability are not suitable. For example, it is preferable to use paper, synthetic paper, or nonwoven fabric such as nylon or polyester that has small holes uniformly formed throughout, or a film in which holes are laminated on paper, synthetic paper, or nonwoven fabric.

In addition, as an airtight packaging material for enclosing a packaging material filled with a heat-generating composition, one made of an airtight film laminated with a film of OV-polyethylene or polypropylene coated with vinylidene chloride, polyester, etc., and polyethylene. preferable.

(Example) Next, the present invention will be explained with examples.

However, "parts" in the examples indicate "parts by weight."

Example 1 6 parts of sodium chloride and 9 parts of sodium metasilicate
A suspension of 6 parts of aqueous salt in 48 parts of water is made from diatomaceous earth.
It was impregnated with a mixture of 28 parts and 12 parts of activated carbon. 30g of this mixture and 30g of cast iron powder with an average particle size of 80 mesh were put into a container at the same time, and immediately measured with a Curley densometer, the material was made of nylon subban bonded polyethylene having an air permeability of 15 to 20 seconds/100ml. It was filled into a 10 x 13 cm packaging material. Then, the exothermic composition was sealed in an airtight packaging material (13 x 17 cm) made of a film of vinylidene chloride coated polypropylene 50μ and polyethylene 40μ.

Example 2 7 parts of sodium chloride and 9 parts of sodium metasilicate
A suspension of 7 parts of aqueous salt in 47 parts of water was mixed with activated carbon 14
1 part, 23 parts of wood flour, and 2 parts of saponified vinyl acetate-methyl acrylate copolymer. 25 g of this mixture and 35 g of cast iron powder with an average particle size of 100 mesh
Pour one g into the container at the same time, and the value measured by the Curley densometer is 18 to 23 seconds/100ml.
The valve was filled in an air-permeable packaging material consisting of three layers: synthetic paper made of synthetic resin, polyethylene cloth, and polyethylene, to obtain a 9.5 x 14 cm filled product. Then, the exothermic composition was sealed in a 12.5 x 17.5 cm airtight packaging material bag made of OV-polyethylene film.

Example 3 9 parts of sodium chloride was dissolved in 27 parts of water and sprinkled on a mixture of 54 parts of diatomaceous earth and 10 parts of activated carbon to impregnate it. 40g of this mixture and 20g of reduced iron powder (RD-3. manufactured by Nippon Steel Powder) were poured into a container one by one, and immediately the Curley densometer measured 8 to 12 seconds/100.
Packaging material consisting of three layers: rayon paper with air permeability - polyethylene split cloth - polyethylene (10 ml)
×13.5cm). This was then coated with vinylidene chloride coated polyester 15μ-polyethylene.
Airtight packaging material consisting of 60μ film (13×
17 cm) to obtain an exothermic composition.

Performance Test The exothermic composition produced by the production method of the present invention in Examples 1, 2, and 3 above was taken out from the airtight packaging material, wrapped in four towels in a room at a room temperature of 20°C, and the temperature was measured using a resistance thermometer. . Both exothermic compositions have a maximum temperature of 60 to 70℃, and a duration of 20 degrees above 40℃.
It showed excellent heat generation performance over hours.

(Effect of the invention) In the manufacturing method, the mixture (a) and metal iron (b) are mixed immediately before being filled into an air-permeable packaging material, and after being filled, they are sealed in an airtight packaging material. Since the time required for the product to dry is short, the product can be manufactured without generating heat even though there is contact with air during that time. Therefore, there is no loss of heat generation during production, and there is no disadvantage that the heated composition becomes a lump and is mixed in the product due to loss of heat generation.

Therefore, unlike conventional methods, the present invention does not require a nitrogen gas purging and sealing device or complicated packaging materials, and despite this, a heat-generating composition with original performance can be obtained. , is an extremely excellent method.

Claims (1)

[Claims] 1. In the production of an exothermic composition comprising metallic iron, sodium chloride, activated carbon, water and a filler, (a) a previously prepared mixture of sodium chloride, activated carbon, water and a filler; and (b) a metal. Preparing a certain amount of each type of iron, putting both of them into one container, immediately filling one chamber of air-permeable packaging material from this container, and then enclosing said packaging material in an airtight packaging material. A method for producing a characteristic exothermic composition.