JP2000087019A - Heat-generating agent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat-generating agent composition having a 1-min or shorter rise time in heat generation to 70 deg.C, giving a heating element having a maximum heat generation temperature of 70-80 deg.C, being advantageous in that the heat-generating agent produces little hot vapor during use, and being usable in a portable hot wet towel or the like and to provide a heating element. SOLUTION: There are provided a heat-generating agent composition which is the one used by being packed into a porous packaging material and contains an iron component as the main component, 2-15 wt.%, based on the iron component, active carbon, and 15 wt.% water, has a 1-min or sorter rise time in heat generation to 70 deg.C, giving a heating element having a maximum heat generation temperature of 70-80 deg.C, and suffering little from the production of a hot vapor; and a heating element prepared by packing the heat-generating agent composition containing the iron component as the main component, 2-15 wt.%, based on the iron component, active carbon, and 5-15 wt.% water into a porous packaging material having a gas permeability of 1-50 S/100 cc, having a 1-min or shorter rise time in heat generation to 70, a maximum heat generation temperature of 70-80 deg.C, and suffering little from the production of a hot vapor from the heat-generating agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable small or medium-sized towel used for nursing care for the elderly, steaming towels for infants, climbing, traveling, toweling for going out, removing makeup, etc., for a long time. The present invention relates to a heating element for use in a warm state and a heating agent composition used for the heating element.

[0002]

2. Description of the Related Art Conventionally, a metal powder such as an iron powder has been used as a main ingredient,
Exothermic agents are known in which a surface active substance such as activated carbon, or a salt such as table salt is appropriately mixed and heat is generated by contact with oxygen gas (usually oxygen gas in the atmosphere) and water. For example, the following are known as exothermic agents containing iron powder as a main component and activated carbon and water.

[0003] Japanese Patent Application Laid-Open No. 50-105562 discloses an exothermic composition which contains iron powder and a reaction aid as active ingredients, generates heat in the presence of water and oxygen, has a viscosity of 104 μm or less and contains water. An exothermic composition obtained by mixing activated carbon is disclosed, and specific mixing ratios are 25 g of iron powder, 1.3 g of common salt, and 2 g of activated carbon.
In the case of the exothermic composition of 5 g and 25 g of water, after the mixing is completed,
It is described that the initial heat generation rate, which is the time from contact with air to 30 ° C., is 3 minutes.

JP-A-50-116380 discloses that a heat-generating composition containing iron and a reaction auxiliary as main components and generating heat in the presence of water and oxygen contains at least manganese, copper, chromium and compounds thereof. An exothermic composition characterized by containing one kind is disclosed, and it describes that activated carbon is used as an adsorbent.

Japanese Patent Application Laid-Open No. 52-113383 discloses an A powder comprising iron powder, a sharp heat-sensitive agent and an antioxidant for metal powder.
There is disclosed a heating agent composed of a component and a humidified activated carbon powder, a component B having a bulking agent, a substance having a water retention property and an oxidation promoter. Specifically, the iron powder in the component A contains 63 to 80% by weight. , The humidified activated carbon powder in component B is 52-
It is stated to be 55% by weight.

[0006] JP-A-55-13712 discloses a heat-generating composition mainly composed of a metal powder that generates heat in the presence of water and oxygen, hydrogen peroxide, water, and a packaging material having at least a part of gas-permeable material. In the heat generating structure, there is disclosed a heat generating structure in which hydrogen peroxide and water are housed separately from the heat generating composition until heat generation, and are packaged so as to be brought into contact with the heat generating composition during heat generation. In general, the water retention agent retains water so that the entire surface of the metal powder is covered with water so that contact with air is not impaired, and water is retained for a long time,
It is a component that is used to gradually apply water, and describes that activated carbon, carbon black, silica gel, alumina, wood flour, and the like are effectively used.

Japanese Patent Application Laid-Open No. 55-139480 discloses that a mixture of 27% of activated carbon fiber, 5% of filler, 4% of oxidation catalyst, 20% of water and 44% of iron powder is prepared by adding iron powder to a surfactant, For example, there is disclosed a heating agent in which a silicon resin is mixed with iron powder by 0.5%, dried and surface-treated, and the heating agent reaches 50 ° C. in 15 minutes, and then reaches about 68 ° C. for 23 hours. It is described that the temperature is lowered after the temperature is maintained.

Japanese Patent Application Laid-Open No. 57-200317 discloses a composition comprising metallic iron, sodium chloride, sodium silicate, a filler, activated carbon and water, wherein the content ratio of each component based on the composition is as follows: 40-60% metallic iron by weight, 1-15% sodium chloride, 0.5-1 sodium silicate
0%, filler 5-40%, activated carbon 2-20% and water 1
An exothermic composition in the range of 0-35% is disclosed, specifically, the outer bag of the exothermic composition is opened, and after 15 minutes of exotherm, the exothermic composition is about 35 ° C. and the maximum temperature is about 55 ° C. Is described.

JP-A-59-15475 discloses (A)
Iron powder, (b) inorganic salt, (c) activated carbon, (d) ash or inorganic foam, and (e) a heat generating composition that generates heat by the presence of air consisting of water is disclosed, specifically, iron powder Is 100 parts by weight, the proportions of the components are approximately 0.5 to 10 parts by weight of inorganic salt, 5 to 50 parts by weight of activated carbon, 5 to 50 parts by weight of ash or inorganic foam, and 20 to 80 parts of water, respectively. Parts by weight, and as a more specific compounding example, iron powder 100
2.3 parts by weight of salt, 26 parts by weight of activated carbon,
It is described that a composition that satisfactorily generates heat in the presence of air can be obtained by uniformly mixing 15 parts by weight of base ash and 50 parts by weight of water.

Japanese Unexamined Patent Publication (Kokai) No. 59-43087 discloses that a powder obtained by adding wood powder and a water retention agent to iron powder and activated carbon and then mixing the resulting mixture with a solution prepared by dissolving neutral salts is added to a bag having a suitable air permeability. In a sealed thermal bag, a mixture of two or more types of iron powder with low viscosity and a low viscosity iron powder or a mixture of two or more types of iron powder with high reactivity and low reactivity Specifically, it is described that the product of the present invention is heated to 51 ° C. after 10 minutes of heat generation and to 75 ° C. after 1 hour.

JP-A-60-106874 discloses an exothermic composition containing at least iron, activated carbon, an oxidation promoter and water, wherein a part or all of iron is steel wool. Specifically, the amount of each component of the exothermic composition is usually 2 to 80 parts by weight of activated carbon, 0.2 to 30 parts by weight of an oxidation promoter and 2 to 90 parts by weight of water, per 100 parts by weight of iron, Preferably 4 to 40 parts by weight of activated carbon per 100 parts by weight of iron, 0.7 to 10 oxidation promoters
It is described that the heating element is a temperature of 40 ° C. or more for about 8 hours at a measuring point in the center of the upper surface and the maximum temperature reaches 49 ° C. Have been.

JP-A-60-173079 discloses a heat-generating composition containing an amorphous silicic acid or a salt thereof which contains iron powder and water and generates heat upon contact with air. In particular, the exothermic composition using amorphous silicic acid or a salt thereof can provide an exothermic effect equivalent to or more than that of using activated carbon, and the exothermic composition does not necessarily use activated carbon. The use of activated carbon is not an essential requirement, and the temperature of the heating bag should be 1
After 0 minute, the composition using silica was activated at 59 ° C. and activated carbon was used. The composition not using silica was 50 ° C., indicating that the composition was superior in exothermic effect to the exothermic composition using activated carbon. .

Japanese Patent Application Laid-Open No. 61-213283 discloses a composition having a metal, a reaction aid and a water retention agent, which generates heat in the presence of water and air. Disclosed is an exothermic composition using activated carbon as a by-product, and more specifically, a temperature after 30 minutes of an exothermic composition containing 30 parts by weight of iron powder, 10 parts by weight of activated carbon, 2 parts by weight of calcium chloride, and 12 parts by weight of water. Was 62 ° C.

Japanese Patent Application Laid-Open No. 61-276556 is characterized in that activated alumina / silica powder is added to activated carbon and mixed as an exothermic accelerator in a warmer using oxidizable metallic iron powder as an exothermic agent. The composition ratio of the agent is Al ₂ O ₃
20 to 80% by weight, 80 to 20% by weight of SiO ₂ ,
In addition, Cairo having a particle size of 60 mesh or less is described.

Japanese Unexamined Patent Publication No. 3-56583 discloses a heating agent which is used by being enclosed in a porous packaging material.
0 to 70.0% by weight, activated carbon and water retention agent 10.0 to 2
A high-temperature short-term exothermic agent comprising 0.0% by weight, 4.0 to 10.0% by weight of salts and 10.0 to 25.0% by weight of water is disclosed. 10-2
An exothermic agent containing 0% by weight and 20 to 40% of water is described. It is also described that when this exothermic agent is used, the temperature reaches 70 ° C. in 0.6 to 2 minutes.

[0016]

SUMMARY OF THE INVENTION The present inventor first conducted various basic experiments in the development of a portable hot wet towel used for removing makeup and the like. Through the experimental results, the appropriate temperature (approximately 50 ° C.) of the hot-wet towel for makeup removal that is in close contact with the exothermic agent is 7 ° C.
When the heat is generated around 0 ° C. and the rise time of the heat generation up to 70 ° C. is within 1 minute, the user can wait without frustration, and from the viewpoint of safety, the maximum heat generation temperature of the exothermic agent In the development of portable hot wet towels used for makeup removal, etc., the fact that the temperature is 70 ° C. to 80 ° C. and the generation of heated steam from the exothermic agent during use is small due to the properties of the hot wet towel for makeup removal. A conclusion was reached that it should be a basic concept.

An object of the present invention is to provide a heating element having a rise time of up to 70 ° C. within 1 minute, a maximum heating temperature of a heating element of 70 ° C. to 80 ° C., and generation of heated steam from a heating agent during use. To provide an exothermic composition having a reduced amount of heat.

[0018]

In order to develop a portable hot wet towel used for removing makeup and the like, the present inventors first studied the above-mentioned conventional heating agents, but many of these heating agents slowly generated heat. And keep it warm for a long time,
It was found that it was suitable for so-called Cairo use, but not suitable for use in heating rapidly and heating. Heating elements used in portable hot-wet towels that are convenient and easy to use for going out need to generate heat quickly. It is difficult to control the exothermic temperature, or this type of exothermic agent that is discarded after use uses heavy metals other than iron, which are environmentally unfavorable. Heat generation was unstable in many cases.

Therefore, the present inventor has found that, as a main component of a heating agent suitable for a portable hot wet towel used for removing makeup, etc., the heating value per unit weight and the safety and economy are excellent. Without polluting the environment
In addition, iron powder was selected as a material capable of rapidly generating heat. Various auxiliary compounds have been studied for iron powder as the main component. Among them, activated carbon has excellent properties in terms of oxidation reaction catalyst functionality, water retention, and fluidity due to its porous nature, and can achieve its purpose without mixing several kinds of drugs. Therefore, activated carbon was selected as the auxiliary compounding agent. In addition, when activated carbon is used as the auxiliary compounding agent, the weight of the heating element itself can be reduced, and the environmental impact due to disposal after use can be cited as a reason for selecting activated carbon.

However, an example in which the initial heat generation rate is increased by using activated carbon as an auxiliary compounding agent is described in Japanese Patent Application Laid-Open No. 3-565 among the heat generation agents containing iron powder as a main component, activated carbon and water.
Nothing other than the exothermic agent described in JP-A-83 could not be found. In the examples described in this publication, a heating agent having a heating time of up to 70 ° C. and a rise time of 1 minute or less is specifically disclosed.
It is suitable to be attached to a hairdressing appliance or a small iron, etc. for the purpose of generating steam, and to be high before and after, but suitable as a heating element for a hot wet towel used for makeup removal etc. It turned out not to be.

In view of the above, many hot wet towels using heat generating compositions mainly composed of iron powder and having different contents of activated carbon and water were experimentally produced, and the rise time of heat generation up to 70 ° C. In the process of examining the comfort and safety of hot wet towels due to the maximum heat generation temperature and the generation of heating steam from the heat generating agent, the content of activated carbon and water in a certain amount range with respect to the iron powder as the main component It has been found that the above-mentioned problems can be solved if the adjustment is made so that the present invention has been completed.

That is, the present invention relates to an exothermic composition which is used by being enclosed in a porous packaging material, the composition comprising iron as a main component,
2-15% by weight of activated carbon and 5-15% of water
Exothermic composition characterized by containing each by weight, a heating time of up to 70 ° C. within 1 minute, a maximum exothermic temperature of the heating element of 70 ° C. to 80 ° C., and generation of heated steam The exothermic composition according to the above, characterized in that the exothermic agent composition has a low content.

In the present invention, iron is a main component, and activated carbon is contained in an amount of 2 to 15% by weight and water is contained in an amount of 5 to 15% by weight based on the iron.
Each of the exothermic compositions contained therein has an air permeability of 1 to 50 S / 1.
A heating element characterized by being enclosed in a 00 cc porous packaging material, and a heating time of up to 70 ° C. within 1 minute, and a maximum heating temperature of the heating element of 70 ° C. to 80 ° C.
And the generation of heated steam from the exothermic agent during use is small.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The exothermic composition of the present invention contains iron such as iron powder, activated carbon and water as essential components. If necessary, a filler, a warming agent, a water retaining agent, As a reaction accelerator, for example, alumina, wood flour, sand, silica gel, polymer foam, metal chlorides and the like can be added. In order to assist the initial heat generation rate, it is desirable to add a metal chloride, particularly sodium chloride, in an amount of 0.5% by weight or more based on the iron content. Further, the heating element of the present invention can be produced by enclosing the heating agent composition of the present invention in a porous packaging material.

The iron used in the present invention may be in any form as long as it can generate heat, and there is no particular limitation on particle size, purity and the like. The shape may be a powder, a granule, a thin plate or a tablet, or the like.

As the activated carbon used in the present invention, any form can be used as long as it has a catalytic action to promote the oxidation reaction of iron, and there is no limitation on the particle size and the like. However, the amount of the activated carbon greatly affects the initial heat generation rate.
By adding the weight%, preferably 4 to 8% by weight, the heating element can be heated to a desired heating rate. 2
If the amount is less than 15% by weight, the effect as an oxidation reaction promoting catalyst is small, and even if it exceeds 15% by weight, the effect as an oxidation reaction promoting catalyst does not change much. Moreover, since activated carbon has a deodorizing effect, the smell such as iron rust can be suppressed during and after use.

In the exothermic composition of the present invention, water is an essential component of the iron oxidation reaction. To maintain the exothermic state for a long time, it is advantageous to increase the water content. However, if the content exceeds 15% by weight with respect to the iron content, not only does the temperature rise rate decrease, but the drug also becomes sticky due to stickiness. It is difficult to uniformly disperse the material. On the other hand, 5% by weight of iron
If the blending amount is less than the above range, the heat of reaction evaporates water and the exothermic reaction is stopped in a short time. As a result, there is a problem that the wet towel or the like is not sufficiently heated. Although the optimum amount of water with respect to the iron content varies somewhat depending on the type and amount of the salt or water retention agent used in combination, the amount of water to be incorporated must be in the range of 5 to 15% by weight based on the iron content.

In the case of such an iron-based exothermic agent, if the amount of water relative to the iron content is 5% by weight or more, the exothermic agent becomes sticky, and the uniform filling and uniform distribution and distribution of the packaging material after filling are obtained. It becomes difficult, but the exothermic agent has a moisture content of 1
Addition of up to 20% by weight of a superabsorbent polymer improves the fluidity of the exothermic component, facilitates constant filling of the packaging material, and evenly pressurizes the exothermic agent when pressed by a press or the like after filling. Can be dispersed and distributed. If the amount of the superabsorbent polymer added to the water content is less than 1% by weight, the effect of improving the fluidity cannot be exhibited, and if it is more than 20% by weight, it is useless. As a superabsorbent polymer, the average particle size that is easy to flow is 20 to 500 μm, preferably 50 to 200 μm.
m is used. If the average particle size is smaller than 20 μm, fluidity cannot be imparted. If the average particle size is larger than 500 μm, uniform distribution of the polymer is lost. Specific examples of the superabsorbent polymer include, for example, Diamond Wet A2 (Acrylic acid-based absorbent polymer manufactured by Mitsubishi Chemical Corporation: Water absorption capacity is 35 to 40 with 0.9% NaCl aqueous solution).
Times, average particle size of 110 to 150 μm), but is not limited thereto.

As the porous wrapping material in the present invention, any material can be used as long as it has air permeability. Can be exemplified. In the case of an oxidizing exothermic agent that generates heat by contact with the outside air, the permeability of the porous packaging material is important.
That is, in order to increase the heat generation rate, it is necessary to increase the air permeability. However, if it is too high, the evaporation of water increases and the heat generation stops. In consideration of the above, the air permeability of the ventilation sheet is preferably 200 S / 100 cc or less, and the lower limit thereof is preferably as small as possible, and usually about 10 to 200 S / 100 cc is used. In order to speed up the exothermic reaction, air permeability 1 ~
200 S / 100 cc, particularly 1 to 50 S / 100 cc, is preferably used.

The heating element of the present invention can be preferably used particularly for a portable hot wet towel. For example, FIG.
As shown in FIG. 2, the hot wet towel 1 has a wet towel 6 bonded to both ends of a heating element 5 including a heating agent 2, a ventilation sheet 3, and a water shielding sheet 4 with an adhesive portion 7. After being folded in two on the inside, it is housed in an oxygen-impermeable outer bag 8. As described above, the water shielding sheet 4 made of a water-impermeable synthetic resin film such as, for example, a polyethylene film is used on the contact surface with the wet towel 6, and on the open surface not contacting with the wet towel 6, A porous wrapping material made of a flexible synthetic resin film or the like is used as the ventilation sheet 3. In the hot wet towel 1, a wet towel 6 is adhered to a part of the heating element 5 with an adhesive portion 7, so that the wet towel 6 can be used while being closely attached to the heating element. In use, when the outer bag 8 is broken, the temperature becomes appropriate within one minute, and the wet towel 6 is in close contact with the heating element 5.
Can be used.

[0031]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. Example 1 Asahi DuPont Flash Spun Products Co., Ltd. was prepared by mixing and mixing 15 g of a heating agent composition containing iron powder (Atmel 500M manufactured by Kobe Steel Co., Ltd.) as a main component and having various compositions shown in Table 1 mixed and mixed. Tyvek (air permeability 20 s /
100 cc) was filled and sealed so as to be evenly distributed in a 4 × 12 cm ² bag as a porous packaging material, and the time required for each of the heating elements to reach 70 ° C. (initial heat generation rate) was measured. The measurement was performed at room temperature (20 ° C.) by inserting a thermocouple into the bag. Table 1 shows the results. Example 1
The heating elements of Comparative Examples 1 and 2 each had an initial heating rate of 1 minute, but the heating elements of Comparative Examples 1 and 2 did not reach 70 ° C. within 1 minute. The maximum heat generation temperature of the heating elements of Examples 1 and 2 was 75 ° C. and 80 ° C., respectively.

[0032]

[Table 1]

Example 2 As a flexible heating element packaging material, Tyvek (air permeability: 20 s / 100 cc) manufactured by Asahi DuPont Flash Spun Products Co., Ltd. was used as a ventilation sheet, and a polyethylene film was used as a water shielding sheet. These were joined to form a 4 × 12 cm ² bag, and iron powder (Atmel 500M)
88 parts by weight, manufactured by Kobe Steel Co., Ltd.
10 g of a heat generating agent obtained by mixing 4 parts by weight, 2.4 parts by weight of activated carbon, and 9.2 parts by weight of water were filled into the bag so as to be evenly distributed, thereby forming a heating element. Next, 3.8 x 11.8 cm
² so as to one by towels two end consisting of-cut cotton nonwoven, the respective one end of the water shielding sheet surface of the heat generating member was adhered by heat sealing using a polyester having a width 2 mm. The weight of the towel at this time is 1.0 in total
g, but 2.0 g of water was adsorbed on the wet towel, and the line parallel to the adhesive line of the towel was used as a fold line. A portable hot wet towel was placed in an outer bag.
The wet towel was warmed to an appropriate temperature (about 50 ° C) in less than a minute after tearing the outer bag and using the contents when opening the towel surface. Was wiped off, and this was turned up when it became dirty, and the face was further wiped with the second sheet as the surface layer. The wiping operation took three minutes, but the towel integrated with the heating element remained soft and warm, and could be wiped comfortably and easily to all corners of the face. During this time, the heating element did not overheat.

[0034]

According to the present invention, the rise time of heat generation up to 70 ° C. is within 1 minute, and the maximum heat generation temperature of the heating element is 70 ° C. to 80 ° C., and it is possible to maintain a desired constant temperature for a long time. Can be used, the generation of heating vapor from the exothermic agent during use is small, there is no problem of environmental pollution after use, the storage stability of the product is good, the flowability is good and the uniform filling packaging can be continuous, It is possible to provide a lightweight and inexpensive exothermic composition and a portable heating element using the composition.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a hot wet towel to which a heating element of the present invention is applied.

FIG. 2 is a schematic sectional view of a hot wet towel to which the heating element of the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hot wet towel 2 Heating agent 3 Ventilation sheet 4 Water shielding sheet 5 Heating element 6 Wet towel 7 Adhesive part 8 Outer bag

Claims (4)

[Claims] An exothermic composition which is used by being enclosed in a porous packaging material, wherein the composition comprises iron as a main component, and 2 to 15% by weight of activated carbon and 5 to 15% by weight of water with respect to iron. An exothermic composition characterized by containing: 2. The heat generation time up to 70 ° C. is within 1 minute, and the maximum heat generation temperature of the heating element is 70 ° C. to 80 ° C.
2. The exothermic composition according to claim 1, wherein the composition has a low heat generation. 3. A heat-generating agent composition containing iron as a main component, and containing 2 to 15% by weight of activated carbon and 5 to 15% by weight of water with respect to iron, has a porosity of 1 to 50 S / 100 cc in air permeability. A heating element characterized by being enclosed in a packaging material. 4. The heat generation time up to 70 ° C. is within 1 minute, and the maximum heat generation temperature of the heating element is 70 ° C. to 80 ° C.
4. The heating element according to claim 3, wherein the heating steam generated from the heating agent during use is small.