JPS59540B2 - chemical warmer - Google Patents

Description

[Detailed description of the invention] The present invention relates to chemical body warmers.

Various so-called chemical body warmers that utilize the heat of chemical reactions of inorganic compounds have already been proposed.

However, conventional warmers of this type have not always been fully satisfactory in terms of changes over time during storage and suitable temperature duration during use. Therefore, the inventor of the present application has previously stated that “
Developed a heat-generating agent for keeping the human body warm, consisting of wet acidic body warmer ash with a pH of 4.0 to 6.0 and metal powder.
No. 4-12467 and Utility Model Application No. 1983-41009), but the present application further improves this. That is, the present invention was completed based on the discovery that the performance as a chemical body warmer is significantly improved when the metal powder has a specific particle size distribution. It is the same as in each of the above-mentioned prior applications in that they are stored in one bag in an isolated state, and when used, they are mixed to cause an exothermic reaction.

That is, in the present invention, metal powder, mainly iron powder, is
It is necessary to have a particle size distribution such that the entire amount passes through a 325-mesh sieve, and at least 40% of it passes through a 325-mesh sieve. More preferable results can be obtained if the fraction passing through the 325 mesh is 43% or more.

As for the relatively coarse fraction that does not pass through the middle 200 mesh, it is better to keep it as small as possible; for example, it is not preferable that the fraction and the fraction that passes through the 325 mesh are approximately equal in amount, that is, form a two-peak distribution. Wet acid body warmer ash is made by adding inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, or acetic acid to commercially available body warmer ash whose main component is charcoal powder.
Impregnated with an aqueous solution of organic acid such as oxalic acid until its pH is 4.
．． It was adjusted to 0 to 6.0.

The metal powders mentioned above include iron powder, aluminum powder, zinc powder, tin powder, magnesium powder, calcium powder, or a mixture thereof, and these powders are catalyzed by the wet acidic body warmer ash mixed during use. It is oxidized by oxygen in the air and generates heat. Among the above, iron powder is particularly advantageous in the present invention because it is easily available and inexpensive, but it is not limited thereto. The lead foil pouch containing the metal powder mentioned above is acid- and chemical-resistant, so it blocks the effects of wet acid warmer ash before use, and because it is easily broken, it must not be touched from outside the interior when in use. By probing, it can be easily broken and both components can be thoroughly mixed.

The interior containing the moist acidic body warmer ash has a slight air permeability and is vacuum packaged into a non-breathable exterior. As described above, the chemical body warmer of the present invention uses metal powder, mainly iron powder, with a specific fine particle size, so that about 309
When the amount of around 40 Ir of wet acid warmer ash reacts, it can last for 11 to 13 hours or more at a temperature range of 75 to 60 °C, and at a slightly lower temperature of 75
~55°C for 12 to 14 hours or more. Such excellent effects are thought to be due to the fact that the particle size of the metal powder is fine and the specific surface area involved in the reaction is increased. Examples will be described below, but the present invention is not limited thereto. Examples Commercially available warmer ash made by blending combustion improver, glue, etc. with hemp husk (ogara) ash, plain ash, plate ash, or anthracite, etc.
Moist acidic body warmer ash having a pH of 4 to 6 was prepared by impregnating 10% sulfuric acid aqueous solution into 10% aqueous sulfuric acid solution, such as Kiku no Tomomi ash manufactured by Kodama-Ei Dai-Shokai Co., Ltd., with a particle size of 80 mesh or less.

The composition of this product is 45 to 50% by weight of charcoal powder, 5% of sulfuric acid aqueous solution
5 to 45% by weight, with minor components of up to 3% by weight of potassium nitrate or sodium nitrate, and up to 2% by weight of potassium chlorate (
KClO3) or sodium chlorate (NaClO3) and 1
Contains not more than % by weight of potassium permanganate or sodium permanganate. The particle size distribution of the iron powder was as shown in Table 1 below.

The packaging form for both of the above ingredients is shown in Figure 1, where numeral 1 is a lead foil pouch, 2 is a breathable interior, and 3 is an exterior packaging. It is made of a slightly breathable plastic film laminated on the inner surface of the material, and the exterior 3 is made of an aluminum foil laminated with a plastic film on the inner surface, so it is made of a non-breathable material. The required amount of the above iron powder 4 is 1 sachet.
and sealed it.

On the other hand, the required amount of the above-mentioned wet acidic body warmer ash 5 was stored in the inner bag 2 together with the small bag 1, sealed, and vacuum-packed in the outer bag 3.
The eight types of samples prepared in this way were
Cut the exterior 3 at the chain line 6 in the figure and take out the interior 2.
The lead foil pouch 1 was ruptured by rubbing strongly with hands to thoroughly mix both components.

Thereafter, in the test field, the rice was thoroughly rubbed by hand as needed to maintain the temperature between 75'' and 60°C, but in the test (■), hand rubbing was added for 1 minute as necessary to maintain the temperature at 55°C or higher. It is thought that the operation replenishes oxygen from the outside air into the interior, promoting the oxidation of iron and preventing agglomeration.In tests (I) and (■), the desired temperature was maintained respectively. Table 2 shows the times obtained for each sample.

As is clear from Table 2, the particle size distribution of iron powder is an important factor; there is no fraction that does not pass through 100 mesh, and at the same time, 40% of the fraction that passes through 325 mesh.
The most satisfactory results were obtained when the above conditions were met. Although the iron powder of Sample No. D had a sufficient fraction passing through the 325 mesh, there were also quite a lot of coarse particles, and therefore the heat generation performance varied greatly.

[Brief explanation of the drawing]

The figure is a sectional view showing one embodiment of the present invention.

Claims (1)

[Claims] 1 In a product in which a heat-generating agent is housed in a breathable interior and the interior is vacuum-packed in a non-breathable exterior, the heat-generating agent is housed in wet acidic body warmer ash with a pH of 4 to 6 and a lead foil pouch. The iron powder is stored and sealed, and the entire amount of the iron powder passes through a 100 mesh sieve and passes through a 325 mesh sieve at least 40 times.
A chemical hand warmer characterized by having a particle size distribution such that more than % passes through the chemical body warmer.