JP2010169303A - Electric warmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric warmer capable of exerting flexibility, handling performance, and a heat storing/radiating effect, and improving resiliency and comfort in seating by a simple manufacturing method and quality control. <P>SOLUTION: The electric warmer 16 is configured by stacking a flexible heat storage sheet 22 obtained by coating microcapsules 20 of organic high molecular weight polymers enclosing a heat storage material 19 with a coating material 21 of a flexible organic high molecular weight hardened material on a top of a heat insulating base material 18 of an organic high molecular weight composition having a heating element 17. Since the microcapsules 20 are composed of an organic high molecular weight polymer having a chemical structure such as a carbonyl group, and its softening temperature is higher than a curing temperature of the coating material 21 composed of a thermosetting elastomer such as olefin, the flexible heat storage sheet 2 improved in flexibility, handling performance, furthermore, a storage performance and fixing performance can be obtained by the simple manufacturing method and quality control, and as a result, the electric warmer capable of exerting a heat storing/heat radiating effect and improved in resiliency and comfort in seating can be provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric warming tool used for an electric carpet, a car seat heater, and the like.

  Conventionally, this type of electric warming tool has a carpet cover on the main body 3 of the electric warming tool that is formed by covering the heating element 1 that generates heat when energized with a heat insulating material 2 as shown in FIGS. 3 (a) and 3 (b). 4 is used. The main body 3 is composed of a heat insulating material 2, a surface material 5 provided on the upper surface side, and a back material 6 provided on the lower surface side, and the heat generated from the heating element 1 by energization is the surface material. Heat is dissipated in the air from the carpet cover 4 via 5 to warm the person sitting on it.

  Recently, in order to effectively use the heat generated from the heating element 1, a configuration in which the surface material 5 is impregnated or coated with a microcapsule 7 containing a heat storage material having a melting point in the range of 30 to 50 ° C. is proposed. (For example, refer to Patent Document 1). Then, the heat storage material stores excess heat that has been radiated from the carpet cover 4 to the air in the energized state of the heating element 1, and the heat storage material radiates the heat storage in the resting state of the heating element 1.

  Moreover, the structure which uses only the heat generating body 8 which generate | occur | produces the electric warming tool shown in FIG. 4 and electrically energized is also proposed (for example, refer patent document 2). This heating element is a kneaded product of a pair of electrode materials 10 and 11 in which silver powder is dispersed in a copolyester resin, an ethylene vinyl acetate copolymer, and carbon black on an upper portion of a substrate 9 such as a polyethylene terephthalate plate. The resistor material 12 is formed, and the entire upper surface thereof is covered with an exterior material 13.

  As described in paragraph 0079 in the text of Patent Document 2, the packaging material 13 is composed of a 30 μm thick heat-meltable resin film 14 and a 50 μm thick polyethylene terephthalate plate 15. The heat-meltable resin film 14 is bonded to the substrate 9 to prevent water from entering the electrode materials 10 and 11 and the resistor material 12, thereby improving water resistance.

  On the other hand, various storage forms have been proposed for the heat storage body in which the container is filled with the heat storage material. One example is a product in which a heat storage material of sodium acetate trihydrate is filled in a synthetic resin container such as polypropylene. In another example, a paraffin-based heat storage material kneaded into rubber or synthetic resin and formed into a plate shape is coated with an aluminum laminate coating material. More recently, a technique for encapsulating a heat storage material in an organic polymer microcapsule has been proposed and commercialized (see, for example, Patent Document 3 and Patent Document 4).

  This technology is a technology in which an aliphatic hydrocarbon heat storage material is enclosed in microcapsules such as urea formalin resin or melamine formalin resin. Recently, as a microcapsule, a material in which an organic polymer (specifically, an aramid resin is used) and an inorganic compound are combined has been proposed (for example, see Patent Document 5). And in these conventional examples, it is described that the resin of polystyrene, polyethylene, and polyamide other than these is used for the microcapsule.

  Furthermore, regarding a microcapsule that encloses a heat storage material, a heat storage body that has been solidified with a resin of a styrene-butadiene copolymer has been proposed (for example, see Patent Document 6). In addition to this, a heat storage body has also been proposed in which an organic polymer microcapsule encapsulating a heat storage material is solidified with a silicone gel (see, for example, Patent Document 7).

Furthermore, the microcapsules of an organic polymer type encapsulating heat storage material, or quotes _Lee ring the fibers are mixed together with a latex such as polyvinyl alcohol, mixed together with a binder such as acrylic dipping the fiber Have been proposed (see, for example, Patent Document 8). This method, case of applying the electric carpet is described, heating element, via these quotes _Lee ring layer has a configuration obtained by bonding the front fabric and insulation. In addition to this, the same patent also proposes a method of mixing organic polymer microcapsules encapsulating a heat storage material into rubber, which can be applied to diving suits and the like.
JP 2006-2993 A JP 2005-149877 A JP 2003-306672 A Japanese Patent No. 3059558 JP 2007-137916 A JP-A-7-133479 JP 2007-145915 A Japanese Patent Laid-Open No. 6-235592

  However, the electric heating device shown in FIG. 3 configured to cover the conventional heating element 1 with the heat insulating material 2 is impregnated with the microcapsule 7 including the heat storage material in the surface material 5 arranged on the upper surface side of the heat insulating material 2. Or it is the structure to apply | coat. In this configuration, in order to impregnate or apply the microcapsule 7 to the surface material 5, a complicated manufacturing technique and an advanced inspection technique must be used, and there is a problem that the mass productivity is poor.

  This is because the microcapsule 7 is firmly fixed to the surface material 5 without being peeled off using an impregnation method or a coating method, and the encapsulated heat storage material only exhibits a sufficient heat storage and heat dissipation effect. This is because it is a reciprocal phenomenon to ensure the amount of the surface material 5.

  In order to firmly fix the microcapsule 7 to the surface material 5, it is necessary to reduce the amount of the microcapsule 7 and increase the amount of the binding material. In order to satisfy both of these requirements, the microcapsule 7 is impregnated or coated on the surface material 5 using a complicated manufacturing technique and advanced inspection technique. However, this manufacturing method and inspection are poor in mass productivity and mass productivity. Therefore, there is a need for the development of technology with excellent material composition.

  Further, the electric warming tool shown in FIG. 4 having a configuration used only with the conventional heating element 8 is not laminated with a heat storage material or a microcapsule enclosing the heat storage material. Therefore, there is a problem that the heat generation heat dissipation effect is not available and the generated heat cannot be used effectively, and there is a problem that the seating comfort is poor due to the lack of elasticity. There was a need for technical development of the composition.

  The heat storage material is generally calcium chloride, sodium sulfate, sodium thiosulfate, or polyethylene glycol, and these are used in a packaging form wrapped in a bag material. If the heat storage material is in this packaging form, the bag material may be accidentally damaged during application to the heating element. In this case, there has been a problem that the liquid or powder heat storage material falls to the floor. In addition, since the degree of freedom in molding is poor, there is a problem that it is not easy to store in a heating element.

  Therefore, as a method for solving this problem, a microcapsule in which a heat storage material is sealed in an internal space using a hard resin such as a styrene-butadiene copolymer has been proposed and put into practical use. However, in this microcapsule packaging form, there is a problem that the degree of freedom in molding is poor, and it is not easy to store or fix the microcapsule in a heating element.

  Therefore, in order to improve this and to store and fix it in the heating element, there is a technology that solidifies the periphery of the microcapsule enclosing the heat storage material with silicone gel. This technology is based on the softening temperature of the microcapsule and the silicone. The relationship between the gel curing temperatures is unknown, and the crosslinking density of the silicone gel (the level of crosslinking density that discusses the size of the crosslinking point of the rubber part) is unknown. There was a need for improved storage and fixation on the body.

Further in addition to this, the microcapsules, or quotes _Lee bridging latex are mixed together in the fibers such as polyvinyl alcohol, there is a technique or dipping the fibers are mixed together with a binder such as acrylic, micro The magnitude relationship between the softening temperature of the capsule and the curing temperature of the latex or binder is unknown.

  Furthermore, polyvinyl alcohol and acrylics mentioned as examples are not suitable for practical use because they have a problem of dissolving in water when dried and cured at a low temperature of 150 ° C. or lower. Therefore, when dried and cured at a high temperature of 200 ° C. or more, preferably 250 ° C., there is a problem that microcapsules (since the conventionally proposed type has a softening temperature of 150 to 200 ° C.), such a conventional material It was difficult to solve these two conflicting problems.

  For this reason, there has been a demand for clarification of the material type of the microcapsules and the covering materials for solving these conflicting problems and the magnitude relationship between the softening temperature and the curing temperature. In addition to this, the coating material can cover the microcapsule using simple manufacturing technology and quality technology, and can improve the storage property and fixing property to the heating element. There was a need for materials that could improve sitting comfort.

  In view of the above-mentioned problems of the prior art, the problem to be solved by the present invention is to obtain a flexible heat storage sheet having flexibility and heat storage with a simple manufacturing method and quality control with high productivity, and to improve the storage property and fixability. It is another object of the present invention to provide an electric warming tool in which this flexible heat storage sheet is laminated on a heat insulating base material or a heat generating body having a heat generating body, and exhibits heat storage and heat dissipation effects, elasticity, and sitting comfort.

  In order to solve the above-mentioned problems, an electric warming device of the present invention is an organic polymer composition microcapsule that encloses a heat storage material in an internal heat insulating base material of an organic polymer composition system having a heating element. Is a structure in which a flexible thermal storage sheet is covered with a coating material of a flexible organic polymer cured product, and the flexible thermal storage sheet is composed of a carbonyl group, an ester group, an amide group, and an amino group. An organic polymer having any chemical structure, and the coating material is an olefin-based thermosetting elastomer, a polyester-based thermosetting elastomer, a urethane-based thermosetting elastomer, a styrene-based thermosetting elastomer, or a nitrile-based thermosetting. Is a low-crosslinking density silicone gel with a reduced crosslinking point of the rubber part, and the microcapsule has its softening temperature controlled by the coating material. And temperature than was set to the high temperature side material, flexible heat storage sheet was formed by curing in the curing temperature of the coating material.

  The heat storage material is included in the internal space of the organic polymer polymer microcapsule, and the microcapsule has a double coating structure covered with a flexible organic polymer cured material coating material. The flexible heat storage sheet having a double covering structure does not spill liquid or powder heat storage material on the floor even if the covering material is accidentally damaged during the manufacturing process of storing in the electric warming tool.

Moreover, the microcapsule is a material having a softening temperature of about 140 ° C. or higher, and a material having a temperature higher than the curing temperature of the coating material (about 130 ° C. or lower) is used. In the manufacturing process in which the microcapsules are coated with a coating material, they are not destroyed. In addition to this, the flexible heat storage sheet has a structure in which the periphery of the microcapsule is covered with a covering material of a flexible organic polymer cured material, so it is easy to handle and has a high degree of freedom in molding. It can be easily fixed to and stored in a heat-insulating substrate.

  In this way, the flexible heat storage sheet of this configuration and thermophysical material is excellent in handleability and moldability, so microcapsules can be molded into sheets using simple manufacturing technology and inspection technology, making mass production possible Are better. Moreover, the flexible heat storage sheet obtained in this way can be easily joined to the heat-insulating base material using simple manufacturing techniques such as using adhesives and inspection techniques, so that it is an electric warming tool with excellent mass productivity. Is obtained.

  On the other hand, an electric warming tool is used by laying on a tatami mat or a floor, and is heated by energizing a heating element to warm a leg or waist of a person sitting on the heating element. The heat storage material can store the heat dissipated from the upper part when the heating element is energized, and can dissipate the stored heat when the heating element is in the rest (non-energized) state. Heat can be used efficiently.

  In addition, the heat storage material can gradually heat the heat stored during times when people are not using it, such as the nighttime when electricity demand is small and cheap, so that the electric warmer can be warmed up. Can contribute. In addition to this, the electric warming tool is provided with a flexible heat storage sheet composed of a flexible organic polymer cured material covering on the upper side, so that it is rich in elasticity and comfortable to sit on.

  The present invention provides a flexible heat storage sheet excellent in handling properties, moldability and mass productivity, and by laminating this sheet on a heating element, the heat generated from the heating element is stored and the heat storage is efficiently utilized. An electric warmer that saves energy is obtained.

  According to a first aspect of the present invention, there is provided an electric warming tool comprising an organic polymer composition-based microcapsule encapsulating a heat storage material in an internal heat insulating base material of an organic polymer composition system having a heating element. It is a structure in which a flexible heat storage sheet covered with a coating material of a molecular cured product is laminated, and the microcapsule is an organic polymer polymerization having a chemical structure of any one of a carbonyl group, an ester group, an amide group, and an amino group The coating material reduces the cross-linking point of the olefinic thermosetting elastomer, polyester thermosetting elastomer, urethane thermosetting elastomer, styrene thermosetting elastomer, nitrile thermosetting elastomer, rubber part. The microcapsule has a softening temperature set higher than the curing temperature of the coating material. And material, said flexible heat storage sheet was formed by curing at a curing temperature of the coating material.

  The heat storage material is encapsulated in the internal space of the organic polymer polymer microcapsule, and the microcapsule has a double coating structure covered with a flexible organic polymer cured material coating. A material having a softening temperature higher than the curing temperature of the coating material is used. For this reason, a flexible heat storage sheet that is easy to handle, has a high degree of freedom in molding, and can be easily fixed to and stored in a heat-insulating base material is obtained using simple manufacturing techniques and inspection techniques.

  Moreover, since the heat storage material can also gradually dissipate the stored heat in the daytime to warm the electric warming tool, it can contribute to energy saving. In addition to this, the electric warming tool is provided with a flexible heat storage sheet composed of a flexible organic polymer cured material covering on the upper side, so that it is rich in elasticity and comfortable to sit on.

  The electric warming tool of the second invention is a flexible heating material in which an organic polymer polymer microcapsule encapsulating a heat storage material in its internal space is covered with a flexible organic polymer cured material coating material on a planar heating element. The sheet heating element includes a lower substrate of an organic polymer composition system, a pair of electrodes formed on the lower substrate and a resistor capable of generating heat, The resistor and an organic polymer composition-based coating material that covers the entire electrode, and the flexible heat storage sheet has any one of a carbonyl group, an ester group, an amide group, and an amino group. The organic polymer polymer having the following chemical structure: the coating material comprises an olefin-based thermosetting elastomer, a polyester-based thermosetting elastomer, a urethane-based thermosetting elastomer, a styrene-based thermosetting elastomer, a nitrile. A thermosetting elastomer or a low cross-linking density silicone gel with a reduced cross-linking point of the rubber part, and the microcapsule is a material whose softening temperature is set higher than the curing temperature of the coating material. The flexible heat storage sheet is cured at the curing temperature of the covering material.

  Since the flexible heat storage sheet of this configuration and thermophysical material is excellent in handleability and moldability, the microcapsule can be molded into a sheet shape using a simple manufacturing technique and inspection technique, and is excellent in mass productivity. Moreover, the flexible heat storage sheet obtained in this way can be easily joined to the sheet heating element using a simple manufacturing technique and inspection technique such as using an adhesive, so that the electric warming tool has excellent mass productivity. Is obtained.

  The planar heating element includes an organic polymer composition-based lower substrate, a pair of electrodes formed on the lower substrate and a heat-generating resistor, and an organic high-resistance covering the entire resistor and electrode. Since it is composed of a molecular composition-based coating material, an electric warming tool that can be easily produced using a simple manufacturing technique and inspection technique and has excellent mass productivity can be obtained.

  In the electric warming tool of the third invention, in particular, the flexible heat storage sheet used in the first or second invention is formed by covering the heat conductive material with a covering material together with the microcapsules enclosing the heat storage material. A heat conductive material such as graphite and aluminum is covered with a coating material together with a microcapsule that encloses the heat storage material, so a flexible heat storage sheet with excellent heat conductivity is obtained, further improving thermal efficiency and energy saving. It became an electric warmer.

  In the electric warming tool of the fourth invention, in particular, the flexible heat storage sheet used in the first or second invention is obtained by applying a molten coating material to the heat insulating base material or the planar heating element and curing it. Integrated and laminated. Since the covering material is integrated and laminated with the heat insulating base material or the planar heating element, it can be easily joined using a simpler manufacturing method and inspection technology. became.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by the form of this invention.

(Embodiment 1)
FIG. 1 is an electric warming tool according to Embodiment 1 of the present invention, FIG. 1 (a) is a cross-sectional view of the electric warming tool, and FIG. 1 (b) is a perspective view of the electric warming tool. The electric warming tool 16 includes an organic polymer composition-based heat insulating base material 18 having a heating element 17, and an organic polymer polymer microcapsule 20 enclosing a heat storage material 19 in its internal space. At least a flexible heat storage sheet 22 that is covered with a coating material 21 of a molecular cured product is provided, and the flexible heat storage sheet 22 is laminated on the heat insulating substrate 18 and used. And this flexible heat storage sheet 22 is such that the microcapsule 20 is an organic polymer having a chemical structure of any one of a carbonyl group, an ester group, an amide group, and an amino group, and the covering material 21 is an olefin-based thermosetting. Curable elastomer, polyester-based thermosetting elastomer, urethane-based thermosetting elastomer, styrene-based thermosetting elastomer, nitrile-based thermosetting elastomer, or low cross-linking density silicone gel with reduced cross-linking points of rubber parts is there. The microcapsule is made of a material whose softening temperature is set higher than the curing temperature of the coating material, and the flexible heat storage sheet is cured at the curing temperature of the coating material.

  Hereinafter, the present invention will be described in detail based on examples. The heat insulating base material 18 is a molded product having excellent heat insulating properties obtained by foaming a resin such as polyurethane, and a heating element 17 composed of a cable-shaped heater having a structure in which a copper wire for heat generation is covered with a resin insulating layer, It is set as the structure which is arrange | positioned in the side and coat | covers the substantially whole.

The flexible heat storage sheet 22 was obtained as follows. First, n-nonadecane (C ₁₉ H ₄₀ ) having a melting point of 32 ° C. was prepared as the heat storage material 19, and a large number of grains were prepared by encapsulating the n-nonadecane (C ₁₉ H ₄₀ ) in microcapsules 20 of melamine formalin resin. The softening temperature (also referred to as heat distortion temperature) of the melamine formalin resin used as the wall material of the microcapsule 20 is 150 ° C. Therefore, an olefin-based elastomer that cures at a lower temperature of 110 ° C. (the curing temperature is 110 ° C.) is used as the coating material 21, and this is mixed with the microcapsules 20 of the above-described material to form a flexible sheet-like flexibility. A heat storage sheet 22 was obtained.

  As shown in FIG. 1A, the electric warming tool 16 is formed by laminating the flexible heat storage sheet 22 on the heat insulating base material 18 and fixing them together with an adhesive or the like. The back surface material 24 was fixed to the lower surface side with an adhesive material to form an integrated structure.

  The electric warming tool 16 has a structure in which a heat insulating base material 18 is disposed on the lower surface of the heating element 17 and the flexible heat storage sheet 22 to block heat escaping downward, which is effective for the heat storage material 19. The heat can be stored. As shown in FIG. 1B, the electric heating tool 16 of this integrated structure is used as an electric carpet that lays a carpet cover 25 on its upper surface and warms a person sitting on the carpet cover 25. To do.

  The effect will be described. The heat storage material 19 is encapsulated in the internal space of the organic polymer polymer microcapsule 20, and the microcapsule 20 has a double coating structure covered with a flexible organic polymer cured material coating material 21. It has become. The flexible heat storage sheet 22 having a double covering structure prevents the liquid or powder heat storage material 19 from falling down to the floor even if the covering material 21 is accidentally damaged during the manufacturing process of storing in the electric warming tool 16. .

  Moreover, since the softening temperature of the microcapsule 20 is higher than the curing temperature of the coating material 21, the microcapsule 20 is not broken in the manufacturing process in which the microcapsule 20 is coated with the coating material 21. In addition to this, the flexible heat storage sheet 22 has a structure in which the periphery of the microcapsule 20 is covered with a coating material 21 of a flexible organic polymer cured product, so that it is easy to handle and has a high degree of freedom in molding. Bonding and fixing to the heat insulating substrate 18 can be facilitated.

  In this way, the flexible heat storage sheet 22 of this configuration and thermophysical material is excellent in handling and molding properties, so that the microcapsule 20 can be molded into a sheet shape by using a simple manufacturing technique and inspection technique. Excellent in properties. Moreover, the flexible heat storage sheet 22 obtained in this way can be easily joined using a simple manufacturing technique such as using an adhesive for the heat insulating base material 18 and the surface material 23 and an inspection technique. An excellent electric warmer 16 is obtained.

  When the microcapsule 20 is covered with the covering material 21 to obtain the flexible heat storage sheet 22, the heat insulating base material 18 and the surface material 23 and the flexible heat storage sheet 22 are integrated by using the covering material 21 as an adhesive. Alternatively, a method of simultaneous molding may be used.

On the other hand, the electric warming tool 16 is used by laying on a tatami mat or a floor, and is heated by energizing the heating element 17 to warm the legs and waists of a person sitting on the heating element. Since the heat storage material 19 can store the heat radiated from the upper surface material 23 in the energized state of the heat generating body 17 and can radiate the heat storage in the rest (non-energized) state of the heat generating body 17, the thermal efficiency The heat generated from the heating element 17 could be used efficiently.

  In addition, the heat storage material 19 can also gradually release the heat stored in a time zone that is not used by humans, such as a nighttime time when electricity demand is small and inexpensive, thereby warming the electric warming tool 16 in the daytime. Can also contribute. In addition to this, the electric warming tool 16 is provided with a flexible heat storage sheet 22 made of a flexible organic polymer-cured material covering material 21 on the upper side. good.

  The material to be used will be described. The heating element 17 is a sheet heater in which a heating resistor sheet made of resin and carbon black is sandwiched with a resin insulating sheet, a single wire in which the periphery of the linear heater wire is covered with an insulator such as a fluororesin, and a heating copper Use a cable heater, etc., in which the wire is covered with a resin insulation layer.

  The heat-insulating base material 18 is mainly composed of a foamed resin molded product such as polyurethane, silicone, neoprene, acrylic, styrene-butadiene rubber, and the like. It was. Furthermore, the heat-insulating base material 18 is a material in which a phosphoric ester-based flame retardant is mixed to improve the flame retardancy, and a part of the heating element 17 is disposed and fixed to cover most of the remaining part. As good as

  The heat storage material 19 is a latent heat storage agent having a melting point or freezing point of 10 to 80 ° C., preferably 20 to 60 ° C. Specifically, sodium acetate trihydrate (melting point 58 ° C.), lithium nitrate trihydrate (melting point 30 ° C.), calcium chloride hexahydrate (melting point 27 ° C.), stearic acid (melting point 71 ° C.), cetyl alcohol (melting point) 51 ° C.) and aliphatic hydrocarbons having 15 or more carbon atoms (n-decane, tetradecane, pentadecane, eicosane, docosan, etc.).

  Among these, the aliphatic hydrocarbons were excellent because they were excellent in the inclusion in the microcapsules 20 and could be included by a simple manufacturing method and quality control. Since the melting point of an aliphatic hydrocarbon increases with an increase in the number of carbon atoms, it is possible to select an aliphatic hydrocarbon having a melting point according to the purpose or to mix two or more kinds. When the heat storage material 19 is a material having a melting point of less than 10 ° C. or a material exceeding 80 ° C., the heat storage material 19 has a complicated heat retaining operation. All of these materials are materials in an impractical temperature range.

  The microcapsule 20 is an organic polymer having a carbonyl group, an ester group, an amide group, or an amino group in its capsule wall, and the organic polymer polymer having the chemical structure in the capsule wall. Thus, the softening temperature is about 140 ° C. or higher.

  Specifically, polyamide resin (having amide group), polyacrylamide resin (having amide group), polyurethane resin (having ester group), aminoplast resin (having amino group), polyacrylate resin (ester) Group), aramid resin (general name of polyamide composed only of aromatic skeleton, having amide group), urea formalin resin (having amino group), and melamine formalin resin (having amino group).

  The organic polymer cured product used for the covering material 21 is an olefin-based thermosetting elastomer, a polyester-based thermosetting elastomer, a urethane-based thermosetting elastomer, a styrene-based thermosetting elastomer, a nitrile-based thermosetting elastomer, or a rubber part. Any of low crosslink density silicone gels with reduced crosslink points, and its curing temperature is about 130 ° C. or lower.

  The microcapsule 20 and the coating material 21 have a material composition and a manufacturing heating process temperature of each other in consideration of a material in which the softening temperature of the microcapsule 20 (also referred to as a heat deformation temperature) is higher than the curing temperature of the coating material 21. I have decided. For example, when the microcapsule 20 is a melamine formalin resin (also referred to as melamine resin) whose softening temperature (also referred to as heat distortion temperature) is 150 ° C., the coating material 21 is an olefin elastomer having a curing temperature of approximately 110 ° C. Is used.

  By this, in the manufacturing process in which the microcapsules 20 are coated with the covering material 21, the flexible heat storage sheet 22 that is not broken and has excellent handleability and moldability is obtained using a simple manufacturing method. Can do.

  Furthermore, this makes it possible for the heat storage material 19 having a melting point or freezing point of 10 to 80 ° C., preferably 20 to 60 ° C., to be satisfactorily stored without being deteriorated by storage in the microcapsule 20 or coating with the coating material 21. Is trying to demonstrate. The flexible heat storage sheet 22 is mixed with the remaining weight ratio of the covering material 21 made of the above-described material to 20 to 70 wt% (preferably 30 to 60 wt%) of the microcapsule 20 to form a molded product such as a sheet. The blending ratio was changed according to the required flexibility.

  For comparison, a thermosetting elastomer other than the above or a silicone gel of a type having many crosslinking points in the rubber part (so-called medium to high type crosslinking density) is employed as the coating material 21 to cover the microcapsule 20. The made flexible heat storage sheet 22 was prototyped and the effect was determined. These comparative prototypes were slightly harder and less flexible than the products of the present invention, and the adhesion to the microcapsules 20 was insufficient.

(Embodiment 2)
FIG. 2 is a cross-sectional view of an electric warming tool according to a second embodiment of the present invention. An electric warming tool (second embodiment) 26 includes a planar heating element 27 and a flexible heat storage sheet 22 laminated thereon. It consists of. The planar heating element 27 includes an organic polymer composition-based lower base 28, a pair of electrodes 29 and 30 formed on the surface of the lower base 28, a resistor 31 capable of generating heat, and electrodes 29 and 30. And a coating material 32 of an organic polymer composition system covering the entire resistor 31.

  The flexible heat storage sheet 22 is formed by covering an organic polymer polymer microcapsule 20 enclosing the heat storage material 19 in an internal space with a flexible organic polymer cured material coating material 21.

  And this flexible heat storage sheet 22 is such that the microcapsule 20 is an organic polymer having a chemical structure of any one of a carbonyl group, an ester group, an amide group, and an amino group, and the covering material 21 is an olefin-based thermosetting. Curable elastomer, polyester-based thermosetting elastomer, urethane-based thermosetting elastomer, styrene-based thermosetting elastomer, nitrile-based thermosetting elastomer, or low cross-linking density silicone gel with reduced cross-linking points of rubber parts is there.

  The microcapsules are made of a material whose softening temperature is set higher than the curing temperature of the coating material, and the flexible heat storage sheet is cured at the curing temperature of the coating material.

  The second embodiment is different from the first embodiment in that the flexible heat storage sheet 22 is laminated on the planar heating element 27 and the configuration of the planar heating element 27 is limited. Other configurations are the same as those of the first embodiment.

Therefore, in this embodiment, the configuration and materials of the planar heating element 27 will be described in detail based on examples. The planar heating element 27 is an organic material capable of generating heat disposed between a pair of electrodes 29 and 30 and the electrodes 29 and 30 on the surface of a lower base 28 of a polyester resin system (eg, polyethylene terephthalate resin). A resin-based resistor 31 is formed.

  In addition, an organic resin-based coating material 32 is further laminated on the upper portion so as to cover the electrodes 29 and 30 and the resistor 31. The coating material 32 is composed of an adhesive layer 33 made of an adhesive mainly composed of a polyester resin, and an upper base material 34 of a polyester resin system (for example, polyethylene terephthalate resin). The upper base material 34 is disposed on the upper surface of the adhesive layer 33. The adhesive layer 33 is made of a material that has a lower concentration of aromatic dicarboxylic acid and a lower concentration of alicyclic dicarboxylic acid and aliphatic dicarboxylic acid than the lower substrate 28 and upper substrate 34. is there.

  Specific examples of this heating element are described below. First, the electrodes 29 and 30 were formed on one side of a polyester resin-based lower base material 28 having a thickness of 125 μm. The electrodes 29 and 30 are conductive silver pastes in which 5 wt% of a conductivity imparting material composed of silver and carbon is dispersed in a binder obtained by mixing a copolyester resin and a blocked isocyanate curing material. It has become. The electrodes 29 and 30 are composed of a main electrode and branch electrodes branched from the main electrode, and the branch electrodes are arranged alternately.

  Next, the organic resin resistor 31 was formed so as to be disposed between the electrodes 29 and 30 that were already formed. The resistor 31 is an organic resin resistor having positive resistance temperature characteristics, and a paste obtained by kneading an ethylene vinyl acetate copolymer and carbon has a thickness of 10 μm by printing and drying.

  Thereafter, a conductive terminal (not shown) made of copper foil having a thickness of 70 μm is laminated on the power feeding portions (not shown) of the electrodes 29 and 30 via a conductive organic material of a conductive silver paste and dried. Then, the electrodes 29 and 30 and the conductive terminal (not shown) were electrically and physically joined. This conductive organic material is a material in which silver powder is dispersed as a conductivity-imparting material in a binder obtained by mixing a copolyester resin and a blocked isocyanate curing material.

  Further, a coating material 32 is arranged on the upper portion so as to cover the lower base material 28, the electrodes 29 and 30, and the resistor 31. The coating material 32 is a material composed of an adhesive layer 33 of a 20 μm-thick film mainly composed of a polyester resin and a polyester resin-based upper base material 34 having a thickness of 100 μm. The coating material 32 is laminated by being thermally fused with a material such as the lower substrate 28 and the resistor 31 by a laminating roll whose temperature is set to be equal to or higher than the melting point temperature of the adhesive layer 33.

  The lower base material 28 is covered with a coating material 32 and heat-sealed to form an airtight structure so that moisture or the like does not adhere to the resistor 31 and change its resistance value. Finally, a lead wire for power supply (not shown) is passed through a gap (not shown) provided in a portion of the coating material coating material 32 corresponding to the conductive terminal (not shown) by means such as heat melting. Is completed.

  The polyester resin used for the adhesive layer 33 has an optimized composition of polyvalent carboxylic acid and has a melting point of 91 to 125 ° C., so that the crystallinity is increased and the blocking resistance, adhesiveness and hydrolysis resistance are improved. Yes. Further, as the crystallinity of the polyester resin used for the adhesive layer 33 is increased, the resistor 20 is also increased in crystallinity, and there is an advantage that the durability reliability is improved. Further, the technology for joining the lower base material 28 and the upper base material 34 with the adhesive layer 33 interposed therebetween and the technology for producing the planar heating element 27 using the adhesive layer 33 are manufactured by a simple manufacturing method and quality control. The planar heating element 27 with improved productivity and reliability can be produced.

In addition, as the material used for the planar heating element 27, various materials described below can be used in addition to the above-described embodiments. For example, the electrodes 29 and 30 may use copper wires. The resistor 31 is a material in which an organic polymer (eg, polyethylene, phenol resin, polyamide, polyester) is mixed with a conductive material (silver, copper, or carbon alone or in combination thereof). The lower base material 28 and the coating material 32 are polyethylene, polypropylene, polystyrene, or the like.

  The adhesive layer 33 applied to the coating material 32 is polyvinyl acetate or the like, and is configured to be applied to the entire surface of the coating material 32 so as to cover the electrodes 29, 30 and the resistor 31, or the coating material so as not to cover them. It is set as the structure apply | coated to the edge part of 32. Further, the coating material 32 may be only the upper base material 34 without using the adhesive layer 33. In this case, the lower base material 28 and the upper base material 34 are made of polyethylene or polypropylene, and both are heat-sealed. You may join. The planar heating element 27 is more elastic and more comfortable to sit on if the material used and its dimensions and shape are optimized to have flexibility.

  The effect will be described. The heat storage material 19 is encapsulated in the internal space of the organic polymer polymer microcapsule 20, and the microcapsule 20 has a double coating structure covered with a flexible organic polymer cured material coating material 21. It has become. The flexible heat storage sheet 22 having a double covering structure may cause the liquid or powder heat storage material 19 to fall to the floor even if the covering material 21 is accidentally damaged during the manufacturing process of laminating the sheet heating element 27. Absent.

  Moreover, since the softening temperature of the microcapsule 20 is higher than the curing temperature of the coating material 21, the microcapsule 20 is not broken in the manufacturing process in which the microcapsule 20 is coated with the coating material 21. In addition, since the periphery of the flexible heat storage sheet 22 is covered with a covering material 21 made of a flexible organic polymer cured product, it is easy to handle and has a high degree of freedom in molding. Can be easily laminated.

  In this way, the flexible heat storage sheet 22 of this configuration and thermophysical material is excellent in handling and molding properties, so the microcapsule 20 is molded into a sheet using a simple manufacturing technique and a low inspection technique. And is excellent in mass productivity. Moreover, the flexible heat storage sheet 22 obtained in this way can be easily joined to the sheet heating element 27 by using a simple manufacturing technique such as using an adhesive and a low inspection technique. An excellent electric warmer 26 is obtained.

  Moreover, when the microcapsule 20 is covered with the covering material 21 to obtain the flexible heat storage sheet 22, the sheet heating element 27 and the flexible heat storage sheet 22 are integrated and simultaneously molded using the covering material 21 as an adhesive. A method may be used.

  The electric warming tool 26 is used by laying on a tatami mat, a floor, or a chair, and is heated by energizing the planar heating element 27 to warm the legs and waists of the person sitting on it. Since the heat storage material 19 can store the heat radiated from the upper part in the energized state of the sheet heating element 27 and can radiate the heat storage in the rest (non-energized) state of the sheet heating element 27, the thermal efficiency As a result, the heat generated from the planar heating element 27 could be used efficiently.

  Further, the heat storage material 19 can also gradually release the heat stored in a time zone that is not used by humans, such as a nighttime time when electricity demand is small and inexpensive, thereby warming the electric warming tool 26 in the daytime. Can also contribute. In addition to this, the electric warming tool 26 is provided with a flexible heat storage sheet 22 composed of a covering material 21 of a cured organic polymer having flexibility on the upper side. good.

The material configuration of the planar heating element 27 will be examined in more detail, and the contents will be described below. Electrode 29, 30 of a composition in which a mixture of silver or copper alone or in combination or carbon is dispersed in a thermoplastic organic polymer resin, a flexible thin film resistor 31, and a flexible thickness It has been found that the substrate and the coating material are good when used. The details will be described below.

  The electrodes 29 and 30 are made of a thermoplastic organic polymer resin (polyethylene, polypropylene, fluorine resin, polyamide, polyacetal, polyester, etc.) having good elasticity and flexibility, and silver or copper alone or in combination or carbon and A composition in which the mixture is dispersed in a total of 2 to 10 wt% (preferably 3 to 7 wt%) is not only flexible but easy to bend, so it can be used on a tatami mat, floor, or chair. Even if a person stands or sits on the top several times, the electric warming tool 26 having excellent durability and reliability can be obtained without disconnection.

  In addition, since the thermoplastic organic polymer resin is used, it is melted if heated and reversibly repeats solidification if cooled, so that the sheet heating element 27 can be produced by a simple manufacturing method. Among them, in particular, the electrodes 29 and 30 are compositions in which silver is dispersed in 2 to 10 wt% (preferably 3 to 7 wt%) in a polyester organic polymer resin having excellent elasticity and flexibility. It is more elastic and easier to bend, so it can be used on tatami mats, floors, and chairs so that it will not break even if people stand or sit on it many times. The electric warming tool 26 with higher reliability can be obtained.

  The resistor 31 is a thermoplastic organic polymer resin (for example, ethylene vinyl acetate copolymer, ethylene acrylic ester copolymer, ethylene methyl methacrylate copolymer, polyethylene, polypropylene, fluorine resin, polyamide, polyacetal, polyester, etc.) In addition, conductive materials (eg, carbon, silver, etc.) are mixed with thermosetting organic polymer resins such as phenol and melamine, and the thickness is reduced to 5 to 20 μm so as to have flexibility. .

  Among them, the resistor 31 is particularly good when a thermoplastic organic polymer resin having good elasticity and flexibility is used as the base resin. These thermoplastic organic polymer resins are flexible and easy to bend, so they can be used on tatami mats, floors and chairs, and people can stand and sit on them several times. The electric warming tool 26 excellent in durability and reliability is obtained without disconnection. In addition, since the thermoplastic organic polymer resin is used, it is melted if heated and reversibly repeats solidification if cooled, so that the sheet heating element 27 can be produced by a simple manufacturing method.

  If necessary, the resistor 31 is made of a thermoplastic organic polymer (for example, ethylene vinyl acetate copolymer, ethylene acrylic ester copolymer, ethylene methyl methacrylate copolymer, etc.) and a conductive material (eg, , Carbon, silver, etc.) and an elastomer (eg, olefin elastomer, styrene elastomer, etc.) or rubber (ethylene propylene rubber, polybutadiene, etc.) are dispersed.

  Resistor 31 becomes flexible when elastomer or rubber is dispersed. It is more flexible and more flexible, so it can be used on tatami mats, floors and chairs. Even if a person stands or sits for a number of times, the electric warming device 26 is obtained that does not break, and is more excellent in durability and reliability.

  The lower base material 28 and the coating material 32 have a flexible thickness. For example, the coating material 32 includes an adhesive layer 33 made of an adhesive (thickness: 10 to 50 μm) mainly composed of a polyester resin, and an upper base material of a polyester resin system (eg, polyethylene terephthalate resin) having a thickness of 50 to 300 μm. 34.

And this adhesive layer 33 is made from a polyester resin-based lower substrate 2 having a thickness of 50 to 300 μm.
8 and the upper substrate 34 is laminated on the upper side of the adhesive layer 33. The adhesive layer 33 is made of a material having a low concentration of aromatic dicarboxylic acid and a concentration of alicyclic dicarboxylic acid and aliphatic dicarboxylic acid equal to or higher than those of the lower substrate 28 and the upper substrate 34. This increases the adhesive strength. Due to the synergistic effect of the material and thickness of the planar heating element 27 in this way and the flexible heat storage sheet 22 disposed on the upper side, the electric warming device 26 is more elastic and sits. The comfort is even better.

(Embodiment 3)
Embodiment 3 is the content which further examined about the material structure of the flexible thermal storage sheet | seat 22 used in Embodiment 1 or 2. FIG. A thermal conductive material 35 such as graphite or aluminum is covered with a microcapsule 20 containing a heat storage material 19 and a coating material 21 of a thermosetting elastomer or a low crosslink density silicone gel (a type in which the crosslink points of the rubber portion are reduced). If it was set as the material composition to cover, the flexible thermal storage sheet | seat 22 excellent in thermal conductivity was obtained, and it became the electric warming tools 16 and 26 which further improved thermal efficiency and energy saving property.

  The flexible heat storage sheet 22 is mixed with the remaining weight ratio of the covering material 21 with respect to 10 to 30 wt% of the heat conductive material 35 and 20 to 50 wt% (preferably 30 to 40 wt%) of the microcapsule 20, It was obtained by processing into a molded product such as a sheet, and the blending ratio was changed according to the required flexibility.

(Embodiment 4)
The fourth embodiment is the content of further study on the manufacturing method of the flexible heat storage sheet used in the first or second embodiment, and the flexible heat storage sheet covers the heat insulating base material or the sheet heating element in a molten state. The material was applied and cured to integrate and laminate. This manufacturing method is a manufacturing method in which a molten coating material covering microcapsules is applied to the surface of a heat-insulating base material or planar heating element that has already been molded, and is cured by drying. Since both can be joined using inspection technology, it became an electric warming tool with even higher mass productivity.

  The electric warming tool of the present invention uses a flexible heat storage sheet excellent in handling property, moldability and mass productivity, stores heat generated from the heating element, and efficiently uses the heat storage to save energy. Therefore, it can be applied as heating of an electric warming tool, particularly an electric warming tool on which a user is seated.

(A) Sectional view (b) perspective view of electric heating tool of embodiment 1 of the present invention Sectional drawing of the electric warming tool of Embodiment 2 of this invention (A) Perspective view of a conventional electric warming tool (b) Cross section Sectional view of a conventional electric warmer

16, 26 Electric Heating Device 17 Heating Element 18 Heat Insulating Base Material 19 Heat Storage Material 20 Microcapsule 21 Coating Material 22 Flexible Heat Storage Sheet 27 Planar Heating Element 28 Lower Base Material 29, 30 Electrode 31 Resistor 32 Coating Material 33 Adhesive Layer 34 Upper substrate 35 Thermal conductive material

Claims (4)

An organic polymer composition-based heat-insulating base material having a heating element is covered with a flexible organic polymer-cured material covering material that encapsulates the heat-storing material in the internal space. The microcapsule is an organic polymer having a chemical structure of any one of a carbonyl group, an ester group, an amide group, and an amino group, and the coating material is an olefin-based structure. Thermosetting elastomer, polyester-based thermosetting elastomer, urethane-based thermosetting elastomer, styrene-based thermosetting elastomer, nitrile-based thermosetting elastomer, or low crosslink density silicone gel with reduced cross-linking points of rubber parts The microcapsule is made of a material whose softening temperature is set higher than the curing temperature of the covering material, and the flexibility storage is performed. Sheet, electrical Todan device formed by curing at a curing temperature of the coating material. It is a structure in which a sheet-like heating element is laminated with a flexible heat storage sheet made by covering a microcapsule of an organic polymer polymer containing a heat storage material in its internal space with a coating material of a flexible organic polymer cured material. The planar heating element covers an organic polymer composition-based lower base material, a pair of electrodes formed on the lower base material and a heat-generating resistor, and the resistor and the entire electrode. And the flexible heat storage sheet has an organic polymer polymer in which the microcapsule has a chemical structure of any one of a carbonyl group, an ester group, an amide group, and an amino group. The coating material is an olefin-based thermosetting elastomer, a polyester-based thermosetting elastomer, a urethane-based thermosetting elastomer, a styrene-based thermosetting elastomer, a nitrile-based thermosetting elastomer, A low cross-linking density silicone gel with reduced cross-linking points of the soft part, and the microcapsule is a material whose softening temperature is set higher than the curing temperature of the coating material, and the flexible heat storage sheet Is an electric warming tool cured at the curing temperature of the covering material. The electric warming tool according to claim 1 or 2, wherein the flexible heat storage sheet is formed by covering a heat conductive material with a covering material together with a microcapsule containing the heat storage material. An electric warming tool in which a flexible heat storage sheet is integrated and laminated by applying a molten coating material to the heat-insulating base material of claim 1 or the planar heating element of claim 2 and curing the coating material.