WO2000013626A1

WO2000013626A1 - United heating medium and heating material

Info

Publication number: WO2000013626A1
Application number: PCT/JP1999/004784
Authority: WO
Inventors: Naoki Minami
Original assignee: Ferric Inc.
Priority date: 1998-09-06
Filing date: 1999-09-03
Publication date: 2000-03-16

Abstract

A heating medium which comprises a heating agent which generates heat upon contact with air and at least either of a water-absorbing polymer and a polymer not absorbing water. It can be obtained by compacting a mixture of these ingredients together with any of an alcohol, a cross-linking agent, and a plasticizer at a pressure of 100 to 8,000 kg/cm2 to unite all these ingredients. Alternatively, it can be obtained by irradiating the mixture with light or heating the same. The thus-obtained heating medium is so flexible that it can be applied to any curved part in the human body. Compared to conventional heating media, the heating medium has excellent exothermic properties. Hence, a heating material containing the heating medium is usable in various applications in the fields of thermotherapy, cosmetics, and medical treatment.

Description

Specification

Integrated heating element and heating material

Technical field

The present invention relates to an integrated heating element, and more particularly to a flexible integrated heating element used as a heating material such as a disposable body warmer and a heating sheet. Background art

In recent years, various heating materials have been widely used as simple treatment tools for stiff shoulders, neuralgia, muscle pain and the like. Normally, the heating material is configured such that a heating agent that generates heat upon contact with air is covered with a film having a predetermined ventilation volume, and the heating agent and the air gradually react to maintain heat generation for a predetermined time. It is used by sticking it to skin or clothing with an adhesive. The exothermic agent is usually a mixed powder of iron powder mixed with activated carbon, NaCl and water.

However, when powder is used, it is difficult to obtain a heating material having a uniform thickness because the powder moves in the bag, so that there is a problem that a uniform heating effect cannot be obtained on the entire surface to be stuck. Was. In addition, since the heating material must be thick as a whole, it is difficult to attach it to the entire surface at a portion with a large curvature, and especially when used on the face, etc., there is a problem that it is heavy and has a poor usability. Was.

On the other hand, a heating element in which a binder is added to powder and molded into a block by applying pressure is disclosed in Japanese Patent Application Laid-Open No. 59-189183. However, such a block-shaped heating element has no flexibility, so it is difficult to attach it to a curved part, and since it is hard and brittle, edges may be chipped when subjected to impact during transportation and handling. There was a problem of cracking. Disclosure of the invention In such a situation, an object of the present invention is to solve the above problems and to provide an integrated heating element having flexibility that can be attached to any curved portion of a human body. That is, an object of the present invention is to provide an integrated heating element having flexibility to obtain an excellent heating effect over the entire curved portion.

Further, another object of the present invention is to provide a heating element having more excellent heating characteristics than a conventional heating element.

Another object of the present invention is to provide a heating material which does not cause discomfort when worn and has excellent usability. It is another object of the present invention to provide a lightweight and thin-layer beauty heat sheet that fits over the entire face.

The flexible integrated heating element of the present invention comprises: a mixture of a heating agent that generates heat by contact with air and a second polymer other than the water-absorbing polymer and / or the water-absorbing polymer; Alternatively, one of plasticizers is added, and a predetermined pressure is applied to integrate them.

The alcohol preferably contains at least one of ethanol, isopropyl alcohol, ethylene glycol, propylene glycol, or glycerin.The cross-linking agent cross-links between the water-absorbing polymers, and cross-links between the second polymers. Of the crosslinks and the crosslinks between the water-absorbing polymer and the second polymer, those that promote at least one crosslink are preferred.

In addition, the flexible integrated heating element of the present invention is characterized in that the mixture is integrated by applying light or heating and applying a predetermined pressure. Here, a cross-linking agent that promotes at least one of cross-linking between the water-absorbing polymer, cross-linking between the second polymer, and cross-linking between the water-absorbing polymer and the second polymer is used. It is preferred to add. In the present invention, it is characterized in that a filler is added to the exothermic agent and integrated. The pressure is preferably set to 100 to 800 kg / cm ^2. Good.

The heating material of the present invention is characterized by using any of the above-described heating elements of the present invention. In addition, one surface of the integrated heating element is exposed to the air, and a sticking agent is provided on the other surface. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a graph showing heat generation characteristics of the heating material of Example 1. F i .2 is a graph showing the heat generation characteristics of the heating material of Example 5. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described. First, a heating element will be described.

[Heating element]

The integrated heating element according to the present invention is characterized in that at least a heating agent that generates heat upon contact with air, a water-absorbing polymer, and an alcohol are mixed and pressurized.

That is, in the heating element of the present invention, a heating agent component such as iron powder, activated carbon, NaCl, or water is mixed with a water-absorbing polymer, a predetermined amount of alcohol is added thereto, and a predetermined amount is determined using a mold or the like. By applying pressure, an integrated heating element having a fixed shape or a sheet-shaped heating element can be obtained. The heating element thus manufactured has excellent flexibility, and even if it is bent at 90 °, the heating element does not break and restores its original shape. In particular, the heating element made by using a starch / acrylate copolymer for the water-absorbing polymer shows no cracks, etc., even when subjected to the bending test specified in JIS B 2403, and has extremely high flexibility. It shows the nature. This flexibility is maintained not only before the fever but also during and after the fever. Also, the generated heat Even when the body is heat-treated, it can increase its flexibility. The heat treatment condition in this case may be 50 to 250 ° C. for about 10 to 20 minutes.

Further, a feature of the heating element of the present invention is that the heating element is superior to a conventional powder heating element or block heating element. That is, by integrating the exothermic agent via the polymer, the heat generation time per unit weight of the exothermic agent is prolonged, and a high exothermic temperature is obtained. The details of this reason are not clear at present, but by integrating the polymer and the heating element by the method of the present invention, the exothermic component is uniformly dispersed in the heating element, and the steam generated by heat is generated. This is considered to be because the oxygen diffused from the outside and the metal powder react uniformly and at a constant rate within the heating element surface, and the generated heat is efficiently transmitted to the skin surface side.

As described above, since the heating element of the present invention has high flexibility, it can be fitted to any curved portion of the human body. Further, since the heat generation characteristics per unit weight are excellent, a small amount of the heat generating agent component is required to realize the same heat generation characteristics as the conventional heat generator. As a result, the heating element can be reduced in weight and thickness, and the usability is significantly improved.

In the present invention, the pressure at the time of pressurization is not particularly limited as long as the heat generating element can be integrated or formed into a desired shape, but is preferably 100 kg / cm ² to 800 kg / cm ^2. It is preferably used. A heating element having a higher density can be obtained as the pressure at the time of pressurization is higher, but the density is saturated when the heating element reaches about 80 O kg / cm ² . Also, when the pressure is reduced, it becomes an elastic heating element like a sponge.

The heating element of the present invention can be formed into a sheet-like heating element by, for example, rolling a mixture of the heating element components at a predetermined pressure using a roller, in addition to molding into a fixed shape using a mold or the like. You can also. Further, the sheet-like heating element may be cut, punched, or the like into a desired shape according to the application. With this method, Productivity is further improved.

In the present invention, the water-absorbing polymer may have any shape such as a particle shape, a flake shape, and the like.のもの 5 mm, especially about 10 m1 mm is suitably used. By using these polymers, the crosslinking between the polymers is optimized, and the flexibility of the heating element is further improved.

The integrated heating element having flexibility according to the present invention includes, in addition to the heating agent, the water-absorbing polymer and the alcohol system, a heating agent and a water-absorbing polymer, a second polymer other than the heating agent and the water-absorbing polymer, Alternatively, it can also be prepared by mixing a heat generating agent, a water-absorbing polymer and a second polymer, and irradiating the mixture with light and / or heating. By light irradiation or heating, a bridging reaction occurs between at least one of the water-absorbing polymers, between the second polymers, or between the second polymer and the water-absorbing polymer, so that integration and flexibility can be obtained. . Further, in this case, a suitable amount of a crosslinking agent that promotes a crosslinking reaction between at least one of the second polymer and the water-absorbing polymer or between the second polymer and the water-absorbing polymer may be added.

In addition, the mixture can be pressurized before or at the same time as the light irradiation or the heat treatment, so that a heating element having a desired thickness and shape can be suitably produced. Here, the light irradiation is meant to include irradiation of visible light, ultraviolet light, X-rays, gamma rays, and electron beams. As an example of a method of simultaneously performing light irradiation and pressurization, for example, a heating sheet having a desired thickness can be produced by irradiating ultraviolet rays while pressing with a quartz plate or a roller transmitting ultraviolet rays. The heating temperature is appropriately selected according to the type of the second polymer and the water-absorbing polymer, and the irradiation conditions when irradiating light, but is usually about 50 to 250 ° C.

Further, the integrated heating element of the present invention generates heat when it comes into contact with air. It can be produced by integrating a mixture of a heat generating agent, a water-absorbing polymer and / or a second polymer, and a crosslinking agent or a plasticizer by applying a predetermined pressure.

The exothermic characteristics of the exothermic body of the present invention include the exothermic agent material and its component ratio, the exothermic agent, the type of the water-absorbing polymer 'the second polymer and the like and the component ratio, the pressurization, the heating, the light irradiation conditions, and the like. Since these parameters vary depending on the manufacturing conditions, etc., these parameters may be determined as appropriate according to the heat generation characteristics required depending on the use of the heating element, the place of use, and the like.

Further, as a method of controlling the air permeability inside the heating element, a method of mixing a filler may be employed. By blending a predetermined amount of a filler having a predetermined shape and size, an appropriate air passage is formed, a reaction between air and the exothermic agent is controlled, and a desired heat generation temperature can be stably obtained. As the filler, either an organic filler or an inorganic filler can be used. From the viewpoint of thermal stability, an inorganic filler is preferable. For example, powders such as calcium carbonate, titanium oxide, and zinc oxide are used. The body is exemplified.

Hereinafter, each configuration of the heating element of the present invention will be described in detail.

(Heating agent)

The heating agent used in the present invention may be any heating agent as long as it is used for heating materials such as disposable warmers and heating sheets. In addition to the essential components of water, those containing activated carbon or sodium chloride exothermic aids are preferably used.

(Water absorbent polymer)

The water-absorbing polymer generally refers to an organic polymer having high water retention, but in the present invention, is not limited to this, but also includes an inorganic water retention agent having a water retention ability. However, organic polymers are preferred because they have high water retention and exhibit stable heat generation characteristics. In the present invention, the following water-absorbing organic polymer, W

7 The inorganic water retention agent can be used alone or in combination of two or more.However, when the inorganic water retention agent is used alone, in order to obtain a flexible integrated heating element of the present invention, the second polymer Addition is essential.

Examples of water-absorbing organic polymers include polyacrylate, starch / acrylate copolymer, isobutylene / maleate copolymer, PVA, PVA / acrylate copolymer. And N-alkylacrylamide copolymers can be used. Specifically, as polyacrylates, Sanjet IM5310, Sanfleetsh ST571 (manufactured by Sanyo Chemical), Mara,) IP (made by Arakawa Chemical), Wanda Igel (made by Kao), Aquakeep (made by Sumitomo Seika) ), Lanseal (manufactured by Nippon Xelan), Aqualic (manufactured by Nippon Shokubai), Drytech (manufactured by Dow Chemical), Favor (manufactured by Stocknozen), Luquasorb (manufactured by BASF), and the like. Also, as starch / acrylate copolymers, Sunwet IM1000, Sunwet IM2200, Sunfresh ST30, Sunfresh ST100 (manufactured by Sanyo Chemical), and KI gel (manufactured by Kuraray) as an isobutylene / maleate copolymer. ), Sumikagel (manufactured by Sumitomo Chemical) as a PVA / acrylate copolymer, Aqua Reserve GP (manufactured by Nippon Synthetic Chemical) as a PVA copolymer, and Thermogel (manufactured by Kojin) as an N-alkylacrylamide copolymer ) Is exemplified.

Examples of the inorganic water retention agent include diatomaceous earth, bamicularite, silica gel, perlite, vermilite, and the like.

(Alcohol)

As the alcohol, a monohydric or polyhydric liquid alcohol can be used. For example, ethanol, isopropyl alcohol, ethylene glycol, propylene glycol, and glycerin are preferably used.

(Second polymer)

The second polymer other than the water-absorbing polymer of the present invention is heat, light or free polymer. Any material may be used as long as it causes cross-linking between polymers by limers or the like. As the second polymer, for example, acrylic resin, silicone resin, urethane resin, styrene / butadiene-based thermoplastic rubber, or the like can be used.

As the second polymer, like the water-absorbing polymer, any shape such as a particulate or flaky polymer can be used, but in the case of particles, 5 urn-5 mm, particularly 10 π! Those having a size of about lmm are preferred.

(Crosslinking agent)

The cross-linking agent of the present invention is one that causes a cross-linking between the water-absorbing polymers, between the second polymers, or between the water-absorbing polymer and the second polymer. In addition to those that cause cross-linking, those that intervene between these polymers to cause cross-linking. Such a cross-linking agent is appropriately selected and used depending on the type of the water-absorbing polymer or the second polymer. Examples thereof include methylene bisacrylamide, trimethylol pronon triacrylate, Ethylene glycol acrylate, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polyethylene glycol diacrylate, neopentyl glycol diacrylate, tetramethylol methanate triacrylate, epichlorohydrin, Metal ions, polyamide compounds and the like can be used. More specifically, for example, ethylene glycol diglycidyl ether and the like are preferably used for the acrylate salt, and methylenebisacrylamide and the like are suitably used for the starch nocrylate copolymer.

(Other)

The heating element of the present invention may further comprise dibutyl phthalate, getyl phthalate, triethyl phthalate, tributyl phthalate, dioctyl phthalate, dibutyl fumarate, di (butyldiglycol) Plasticizers such as gelatin, polysaccharides such as gelatin, fuori, agar, and gluten; and proteinaceous substances such as tragacanth gum. This will improve the flexibility at any time.

Next, the heating agent of the present invention will be described.

[Heat material]

The heating material using the heating element of the present invention is generally formed by sandwiching the heating element between a gas permeable film having a predetermined air permeability and a non-air permeable film, and sealing the periphery of the film (heat sealing, hot melt melting blow sealing, etc.). However, the structure is such that an adhesive is provided on the non-breathable film side, and is used by attaching it to the skin or clothing (underwear, etc.) with an adhesive. When using a powder heating element or a block heating element, it is common to provide an additional nonwoven fabric on the outside to reinforce the strength of the air-permeable film and the air-impermeable film and prevent the powder from falling off. However, in the present invention, since the heating element is integrated and has flexibility, there is no risk of powder spilling out, and it is not particularly necessary to provide a nonwoven fabric.

In addition, since the reaction rate between the metal powder and oxygen can be controlled by the components of the heating element, the ratio thereof, the manufacturing conditions, etc., an expensive breathable film conventionally used to control the reaction by controlling the oxygen flow rate. Can also be omitted. That is, it is not necessary to provide a film or the like for controlling air flow, and it is possible to adopt a configuration in which the film is exposed to the atmosphere.

The heating material using the heating element of the present invention can be attached to a curved portion having a large curvature because the heating element itself is integrated and has flexibility. Further, unlike powder, it can be manufactured to have a uniform thickness and can maintain that state, so that a uniform heating effect can be imparted to the entire affixed portion. In addition, since the powder does not move in the bag unlike the powder, there is no uncomfortable feeling during use and the feeling of use is extremely excellent. In particular, units The heat generation time and heat generation time per weight of metal powder are extremely superior to those of conventional powder heating materials, so a lightweight and thin-layer heating element can be realized, and furthermore, permeable films and nonwoven fabrics are omitted. As a result, it is possible to obtain a lightweight, thin-layer thermal sheet with excellent usability.

The heating material of the present invention is not limited to a disposable body warmer, a heating sheet for heat treatment, etc., but may be used for various purposes.For example, various adhesives may be contained in an adhesive to allow transdermal absorption of a medicinal ingredient. Heat generating sheets or hot compresses, and cosmetics using a cosmetic gel agent as an adhesive.

In the above, the heating element having the structure having the adhesive has been described. However, in the present invention, the adhesive is not necessarily required, and in this case, the heating material is fixed with, for example, an elastic bandage or a surface fastener such as a berg mouth. do it.

In addition. Prior to use, the heating material of the present invention is stored in a bag in which air is blocked. Hereinafter, the present invention will be described in more detail with reference to examples.

(Example 1)

Iron powder (E-250: 59.5 parts, manufactured by Powder Tech), activated carbon (5.95 parts), NaCl (3.5 parts), water (29 parts), and Sun Fresh ST30

(3.5 parts) was mixed with stirring. 0.7 g of this mixture and 0.1 g of ethanol were placed in a cylindrical mold having an inner diameter of 13 mm, and pressurized at 750 kg / cm ² for 10 seconds to produce a heating element. did. During pressurization, a small amount of liquid was observed to flow out of the mold. This liquid is considered to be water and ethanol that the water-absorbing polymer could not hold under the above pressure.

The heating element was removed from the mold and stored in a non-breathable polyethylene film bag.

For comparison, the case where ethanol was not added at the time of press molding (Comparative Example 1) and the case where only a heat generating agent was used and the water-absorbing polymer was not contained (Comparative Example 2) were similarly used. Produced.

The heating element of the present example obtained as described above is a disc-shaped heating element having a diameter of 13 mm, a thickness of 1.56 mm, and a weight of 0.57 g, and has a smooth surface and gloss. Was done. In addition, the heating element of this example was not damaged even when bent at 90 °, and did not have cracks or chipped edges. Further, the force can be removed to restore the original shape, and it was found that the heating element of this example was extremely excellent in flexibility. It was also found that the flexibility of the heating element was improved after 10 to 20 minutes than immediately after molding.

On the other hand, the heating element of Comparative Example 2 containing no water-absorbing polymer had an appearance as if the powder had been solidified, and had no gloss. In addition, the edges were chipped during the removal from the mold, and were broken and shattered by applying force.

The heating element of Comparative Example 1, which was manufactured without adding alcohol at the time of molding, was smoother than Comparative Example 2.However, the surface of the heating element was not glossy and was brittle enough to have an edge cut off immediately. There was no, but it broke shortly when trying to bend, and no flexibility was observed.

Next, the heat generation characteristics of the heating element of the present example manufactured as described above were measured as follows.

(1) fabricated heating element diameter 20 mm, thickness 30 // breathable film of m and (Tokuyama Ltd. PN 30), 30 g / m ² of polyester nonwoven fabric (Shin Wa Ltd. 7830) thick was laminated with of 70 m of non-breathable polyethylene film (manufactured by Wada Chemical Co., Ltd.), and the periphery was heat-sealed. An adhesive (styrene-isoprene copolymer SIS, 150 g / m ² ) was provided on the nonwoven fabric side on the non-breathable film side to prepare a heating material.

A thermocouple (ST-150, manufactured by RKC) was attached to the surface of the adhesive of the heating material prepared as described above, and the temperature change was monitored. Figure 1 (a) shows the measurement results. As shown in Fig. 1 (a), it was found that the temperature rose to almost 44 ° C 3 minutes after contact with air, and the temperature was maintained at 40 ° C or more for 15 minutes or more.

As is clear from the above, the heating element of this example generates a high temperature for a long time while consuming only 0.57 g (the amount of iron powder is 0.4 g), which is extremely large compared to the conventional heating element. It was found to show excellent heat generation characteristics.

(2) A nonwoven fabric provided with an adhesive on both sides was attached to the heating element of this example, and the temperature change of the surface of the adhesive was measured. Figure 1 (b) shows the measurement results. As shown in FIG. 1 (b), the heating element of this example had a maximum temperature of 54 ° C. and maintained a temperature of 40 ° C. or more for 10 minutes. Although the heating time at 40 ° C or more is shorter than that in Fig. 1 (a), it is not necessary to control the heating temperature, etc. with a breathable film, etc., as in the conventional heating element, and the heating is simpler with a simpler configuration. It can be seen that the material can be manufactured, the weight can be reduced, and the productivity can be improved. In this example, a nonwoven fabric is interposed between the heating element and the adhesive. However, it goes without saying that the adhesive may be directly applied to the heating element.

(3) For comparison, a powder heating element having the same composition as in Comparative Example 1 was prepared, and 0.7 g of the powder heating element was sandwiched between films using the same film, nonwoven fabric, and adhesive as in (1) above. A heating material was prepared. Because of the powder, the volume was large, and the sandwiched film protruded greatly. The thickness of the entire heating material of Example 1 was about 2.5 mm, whereas it was as thick as 4.3 mm, indicating that Example 1 was also excellent in morphology. Temperature measurement after air contact was performed in the same manner as in Example 1. As a result, the temperature reached 40 ° C in 20 minutes after the air contact, the maximum temperature was 40.5 ° C, and the duration of maintaining the temperature at 40 ° C was about 4 minutes. The time required to reach 40 ° C is more than 10 times longer than that of Example 1, and the holding time at 40 ° C is about 1/4. It has been found that it shows the characteristics. (Example 2)

A mixture of 12.5 g of the same exothermic agent and water-absorbing polymer as in Example 1 was placed in a rectangular compression cylinder mold having a width of 150 mm and a length of 100 mm, and ethyl alcohol was added. g was added and compression-molded with a hydraulic press at a pressure of 141 kg / cm ² . In this way, four specimens (thickness: 1.58 mm) were prepared and subjected to JIS B2403 bending test.

Visual observation of the surface revealed no cracks in any of the specimens.

(Example 3)

A heating element was produced in the same manner as in Example 1 except that propylene glycol or glycerin was used instead of ethanol as the alcohol.

The obtained heating element showed the same flexibility as that of Example 1 and showed excellent heat generation characteristics regardless of which alcohol was used.

(Example 4)

A mixture of iron powder (5.95 parts), activated carbon (5.95 parts), NaCl (3.5 parts), water (29 parts) and Sunfresh ST571 (3.5 parts) . 3.6 g of this mixture and 0.6 g of ethanol were placed in a cylindrical mold having an inner diameter of 30 mm, and (1) 280 kg / cm ² , (2) 560 kg / cm (3 ) A heating element was produced by applying a pressure of 840 k / cm ² , (4) 112 kg / cm ² , and (5) 140 kg / cm ² for 30 seconds.

Each of the obtained heating elements was not broken or cracked even when bent at 180 °, and could be returned to the original shape.

According to the above pressure, the thickness of the heating element obtained is (1) 1.76 mm, (2) 1.73 mm, (3) 1.57 mm, (4) 1.56 mm , (5) It changes to 1.53 mm, and is almost constant above a constant pressure (840 kg / cm ^{2 in} this example). Was found to be thick. In addition, it was found that the sample of 280 kg / cm ² became an elastic sponge-like heating element.

The heating element described above was sandwiched between air-permeable films and the like in the same manner as in Example 1, and the heat generation characteristics were examined as a heating material having the same configuration as in Example 1.

As a result, the maximum temperature of all heating materials was 50 ° C or higher, and the temperature was raised to 40 ° C in 3 minutes or less, and the temperature of 40 ° C or more was maintained for at least 2.5 hours. The time to reach the maximum temperature tended to be shorter as the applied pressure was higher, and for example, it was less than 3 minutes at 560 kg / cm ² or more.

(Example 5)

Iron powder (5.95 parts), activated carbon (5.95 parts), NaCl (3.5 parts), water (29 parts), Sunfresh ST 30 (3.5 parts), second polymer Methacrylate / isobutyl methacrylate copolymer (3.5 parts) (soft conditioner powder, manufactured by CI Dental Products Co., Ltd.) was stirred and mixed. 0.57 g of this mixture, 0.5 g of ethanol, and 0.05 g of dibutyl phosphate as a plasticizer (soft conditioner liquid manufactured by CIDS Dental Products Co., Ltd.) were mixed with 0.05 g of a cylinder having an inner diameter of 13 mm. Into a mold and pressurized at a pressure of 7 540 kg / cm ² for 10 seconds to produce a heating element. The resulting heating element was a rubber plate having the same flexibility as the heating element of Example 1, and when observed with an 8 × magnifying lens, the surface was smooth and fine-grained.

Using the above heating element, a heating material similar to that of Example 1 was produced, and its temperature characteristics were measured. The result is shown in figure 2.

As is evident from Fig. 2, it was found that the temperature rose to almost 40 ° C three minutes after contact with air, and that the temperature was maintained at 40 ° C or higher for about 19 minutes. It is thought that various exothermic characteristics can be exhibited depending on the selection and blending amount of the second polymer, not limited to the water-absorbing polymer. (Example 6)

Iron powder (5.95 parts), activated carbon (5.95 parts), NaCl (3.5 parts), water (29 parts), Sunfresh ST30 (3.5 parts), methyl methacrylate / Ethyl methacrylate copolymer (4.3 parts) (Unifast II powder manufactured by DIC Corporation) was mixed with stirring. 3.6 g of this mixture and 0.5 g of methacrylic acid-containing methyl methacrylate 0.5 g (Unifast II solution manufactured by GDS Corporation) 0.05 g was converted to a cylindrical shape with an inner diameter of 30 mm. Into a mold, and pressurized with a pressure of 840 kg / cm ² for 30 seconds to produce a heating element. The resulting heating element was less flexible than the heating element of Example 1, but could be bent up to 40 °. When this heating element was subjected to a heat treatment at 150 ° C for 2 minutes in a nitrogen atmosphere, the flexibility increased, and no cracks were observed by the above magnifying lens observation until it was bent to 70 °. Was. Also, it did not break or hang, and returned to its original shape when the force was removed.

Using this heating element, a heating material similar to that of Example 1 was prepared, and its temperature characteristics were measured.Three minutes after contact with air, the temperature rose to almost 61 ° C, and the temperature of 40 ° C or more increased. It was found to be maintained for 2 hours. Industrial applicability

Since the integrated heating element of the present invention has extremely high flexibility, by using the heating element of the present invention, it can be easily attached to any curved portion of the human body and has a thermal effect on the entire sticking portion. It is possible to provide a heating material capable of effectively imparting heat.

Further, the heating element of the present invention can be formed with a uniform thickness, and has a uniform heating characteristic as a whole, so that a stable heating effect can be provided. Further, since the heating element of the present invention is integrated, even if the breathable film or the like breaks, the powder does not spill out, and a thick nonwoven fabric and the like having a conventional high strength can be omitted. . Furthermore, since the ventilation rate can be controlled by the heating element itself, the heating element can be used as a heating material by directly applying an adhesive for application to the heating element. Furthermore, since the exothermic characteristics are extremely superior to those of powder, the same exothermic characteristics can be obtained with a small amount of exothermic agent. As a result, it is possible to reduce the manufacturing cost of the heating material, and to provide a lightweight and thin-layer heating material that is not stiff and has excellent usability.

As described above, the heating element of the present invention is suitably applied to heating materials used in various fields such as thermal treatment, cosmetics, and medical treatment.

Claims

The scope of the claims

1. To a mixture of a heating agent that generates heat by contact with air and a second polymer other than the water-absorbing polymer and / or the water-absorbing polymer, adding any of alcohol, a crosslinking agent, and a plasticizer, An integrated heating element having flexibility, which is integrated by applying a predetermined pressure.

2. The flexible integrated heating element according to claim 1, wherein the alcohol includes at least one of ethanol, isopropyl alcohol, ethylene glycol, propylene glycol, and glycerin.

3. The cross-linking agent forms at least one of cross-links between the water-absorbing polymers, cross-links between the second polymers, and cross-links between the water-absorbing polymer and the second polymer. 3. An integrated heating element having flexibility according to claim 1 or claim 2, characterized in that the heating element promotes.

4. A mixture of a heat generating agent that generates heat by contact with air and a water-absorbing polymer and / or a second polymer other than the water-absorbing polymer is irradiated with light or heated, and a predetermined pressure is applied. In addition, an integrated heating element with flexibility, characterized by being integrated.

5. A crosslinking agent that promotes at least one of crosslinking among the water-absorbing polymer, crosslinking between the second polymer, and crosslinking between the water-absorbing polymer and the second polymer. The flexible integrated heating element according to claim 4, which is added.

6. An integrated heating element having flexibility according to any one of claims 1 to 5, wherein a filler is added to the heating agent and integrated.

7. Integral having flexibility according to any one of the pressure 1 0 0~ 8 0 0 O kg / cm 2 and billed range paragraph 1, characterized by - Section 6 Heating element.

8. A heating material having the integrated heating element according to any one of claims 1 to 7.

9. A heating material characterized in that one surface of the integrated heating element is exposed to the atmosphere and an adhesive is provided on the other surface.