JP2007031885A - Tool for preventing heat stroke - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for preventing heat stroke, which keeps a heat temperature at ≤35°C for many hours even in a hot summer environment without impairing an appearance as a tool for preventing heat stroke and a wearing feeling. <P>SOLUTION: The tool for preventing heat stroke supports a microcapsule composition containing a heat storage material. Preferably the microcapsule is supported on the back of a tool for preventing heat stroke and the microcapsule is a solid substance. More preferably a sheet impregnated or coated with the microcapsule is attached to the inside of a tool for preventing heat stroke. Preferably the melting point of the heat storage material is about 0-40°C. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a heat stroke prevention device, and in particular, by using a heat stroke prevention device, it suppresses a rapid increase in head temperature and prevents heat stroke in sports and various work under hot weather in summer. To do.

  In summer, sports and various work for a long time under hot weather cause an increase in body temperature, and in particular, an increase in the temperature of the head causes heat stroke. For this reason, in summer, things that fall due to heat stroke are inexhaustible every year, and preventive measures have been requested for some time.

  On the other hand, in order to cool the head, a hat in which a water retaining material or a coolant is attached to the hat has been proposed (for example, Patent Documents 1 and 2). In the proposal of attaching a water retaining material to the hat, cooling is performed by the heat of vaporization of water, but the cooling effect in a place with high humidity is low, and there is an uncomfortable feeling that water adheres to the body. There was also a problem that the wet hat was easily soiled with dirt. On the other hand, the proposal for attaching the coolant to the cap has a problem that the temperature of the coolant rises in a short time and is not suitable for long-term use outdoors.

In addition, a hat provided with a cooling device is proposed (for example, Patent Documents 3 and 4). Both proposals have a problem in that a cap and a liquefied gas cylinder are provided on the cap, and there is a problem that the wearing feeling and appearance are impaired.
JP 2000-73220 A JP-A-11-269714 JP-A-8-27610 Japanese Patent Laid-Open No. 2005-120495

  An object of the present invention is to provide a heat stroke prevention device that is maintained as a head temperature of 35 ° C. or less for a long time even in a hot environment in summer without deteriorating appearance and wearing feeling as a heat stroke prevention device. .

  The present invention is a device for preventing heat stroke in which a microcapsule containing a heat storage material is carried. It is preferable that the microcapsules are carried on the back surface of the heat stroke prevention device, or the microcapsules are solid. More preferably, a sheet impregnated or coated with the microcapsules is attached to the inside of a heat stroke prevention device. Furthermore, the melting point of the heat storage material is preferably in the range of about 0 to 40 ° C.

  The heat stroke prevention device of the present invention uses a microcapsule, so that the head temperature does not easily rise to 35 ° C. or more even in a hot environment in summer without impairing the appearance and wearing feeling as a heat stroke prevention device. Since the following temperature can be maintained for a long time, a cool feeling is maintained for a while, and prevention of heat stroke in long-time work can be expected.

  The heat stroke prevention device of the present invention is not limited to its form as long as a preventive effect is obtained. It may be in the form of a long band, or may be in the form of a connected bag having a small partition. The use may be wound around the head like a headband. When used around a neck like a scarf or tie, it can be used more effectively when used in the vicinity of an artery. As a more preferable form, it is good to use as caps, such as a cap, a hat, and a visor.

  As a method for producing a microcapsule encapsulating the heat storage material used in the present invention, an encapsulation method by a composite emulsion method (Japanese Patent Laid-Open No. 62-1452), a method of spraying a thermoplastic resin on the surface of the heat storage material particles (No. 62-45680), a method of forming a thermoplastic resin in the liquid on the surface of the heat storage material particles (No. 62-149334), a method of polymerizing and coating the monomer on the surface of the heat storage material particles (No. 62). No. -225241), a method for producing a polyamide-coated microcapsule by an interfacial polycondensation reaction (JP-A-2-258052) and the like can be used.

  The membrane material of the microcapsule of the present invention is not particularly limited, but polystyrene, polyacrylonitrile, polyamide, polyacrylamide, ethyl cellulose, polyurethane, aminoplast resin, gelatin and carboxy resin obtained by a method such as an interfacial polymerization method or an in situ method. A synthetic or natural resin using a coacervation method with methylcellulose or gum arabic is used.

  The melting point of the heat storage material used in the present invention is preferably in the range of 0 to 40 ° C., particularly preferably set to around 25 to 37 ° C. near the skin temperature of the human body. Specifically, the carbon number is about 16 Alcohol compounds such as normal paraffin to -25, cetyl alcohol, stearyl alcohol and the like, carboxylic acid compounds such as stearic acid, ester compounds such as methyl laurate and myristyl myristate, and the like. Particularly, the heat of fusion is 80 kJ / kg or more. Of these, aliphatic hydrocarbon compounds and ester compounds are particularly preferred heat storage materials.

  The microcapsule particle size is set by the type of emulsifier, the concentration of the surfactant, the temperature of the emulsified liquid during emulsification, the emulsification ratio (volume ratio of the water phase to the oil phase), and the atomization equipment such as an emulsifier Can be set to a desired value by changing the type and operating conditions (stirring speed, time, etc.), but should be set in the range of 1 to 10 μm so that there is less breakage when twisted on the yarn. Is preferred. The particle diameter of the present invention indicates a volume average particle diameter measured using a Beckman Coulter Coalter Counter, Multisizer.

  Since the microcapsules according to the present invention are usually obtained as a dispersion suspended in a dispersion medium such as water, the microcapsules filled in a film-like packaging material may be placed inside the heat stroke prevention device. In addition, the microcapsule dispersion may be disposed in the heat stroke prevention device by filling it with a solid material formed into a powder, granule, pellet or the like by removing water and drying.

  The present invention can also be achieved by arranging a microcapsule formed into a solid product such as powder, granule, pellet or the like into a granulated product and placed inside a heat stroke prevention device.

  The present invention can also be achieved by processing a heat stroke prevention device using a heat storage sheet coated or impregnated with microcapsules, or pasting it on the back surface of the heat stroke prevention device.

  Examples of the method for drying and solidifying the microcapsules include a spray-drying method, a freeze-drying method, and a drum-drying method, and the microcapsule dispersion is usually formed into a microcapsule solid material having a size of 0.1 to 100 mm. The shape is preferably a powder, granular shape, spherical shape, elliptical shape, box shape, rod shape, or the like that facilitates heat exchange as much as possible.

  When filled with a microcapsule dispersion or a dry solid, the packaging material is preferably as thin as possible so as not to impede the performance of heat storage and heat dissipation, excellent in thermal conductivity, and high in strength. Specifically, in addition to synthetic resin materials such as polyethylene, polypropylene, nylon, and polyester, metal films and materials obtained by metal deposition on films can also be used.

  The microcapsule granulated product is obtained by removing the microcapsule slurry from a drum dryer, spray dryer, freeze dryer, filter press, various powdering equipment such as centrifugal separators, dehydrating equipment, extruding granulator, Solidification processing is performed using various granulation apparatuses such as a dynamic granulator and a fluid drying apparatus. Further, it can be processed into a spherical shape, a cylindrical shape, a cube shape, a rectangular parallelepiped shape, an egg shape, a star shape, etc. using a granulator, a grinder, etc. is there.

  If necessary at the time of powdering or granulating, various binders, fungicides, insect repellents, and flame retardant agents may be added in this step. Furthermore, deterioration inhibitors, antioxidants, plasticizers, tackifiers, lubricants, colorants, curing agents, foaming agents, synthetic fibers, synthetic resins, heat insulating materials, VOC removal materials, activated carbon, moisture absorption / release agents, aromas Ingredients can be added.

  The fabric used in the present invention is a wrapping material for filling and fixing a granulated material. However, since it is more breathable and excellent in heat dissipation, the effect of the present invention is further promoted. Specific examples of the fabric include fibers such as cotton, hemp (flax, ramie), silk, wool, rayon as regenerated fiber, cupra, acetate as semi-synthetic fiber, triacetate, promix, nylon as synthetic fiber, acrylic Fabrics obtained using fibers such as vinylon, vinylidene, polyester, polyethylene, polypropylene, and phenolic fibers are used.

  Supports used in the process of coating or impregnating microcapsules include natural fibers such as cotton, hemp, silk, wool, rayon as recycled fibers, cupra, acetate as semi-synthetic fibers, triacetate, promix, synthetic Examples of the fibers include knitted fabrics such as nylon, acrylic, vinylon, vinylidene, polyester, polyethylene, polypropylene, and phenolic fibers, fabrics such as woven fabrics and nonwoven fabrics, and sewn products of these fabrics. If necessary, the surface may be covered with a resin or water repellent or heat treated. The thickness of these sheets is not particularly limited, but it is preferable to use a supple material that is as thin and flexible as possible to obtain a comfortable feel without stiff intuition when processed into a fabric and further processed into a clothing material. .

  As an apparatus for coating or impregnating microcapsules on these sheets, coating is performed on one or both sides of a sheet using a coater such as an air knife coater, a blade knife coater, or a curtain coater, a dip coater, a roll coater, etc. The entire support may be impregnated using a coater capable of impregnation. For drying, heating means such as hot air drying or high frequency drying is used, and drying is performed at a temperature that does not cause deterioration of the microcapsules or the support. The microcapsules are applied or impregnated with an aqueous or solvent system using these apparatuses, but the microcapsules can be powdered and then attached to the sheet in a solid state.

Solid weight of the microcapsules coated or impregnated on a support, which is also affected by the thickness of the support, 1 to 100 g / m ^2, preferably is coated or impregnated with a range of 5 to 50 g / m ² The If it is below this range, the heat storage performance is poor, and if it is above this range, it may be difficult to process or the feeling of wearing may be impaired.

  When coating or impregnating the support, an appropriate binder is added together with the microcapsules if necessary. Specific examples of binders that can be used include conventionally known natural polymer materials, natural polymer modified products (semi-synthetic products), and synthetic products having binding ability and film-forming ability. Natural polymeric substances used in the binder include starches, gelatin, casein, etc., semi-synthetic products such as methylcellulose, ethylcellulose, methylethylcellulose, carboxymethylcellulose, acid-decomposed starches such as solubilized starch, and synthetic products , Polyvinyl alcohol, acrylic acid ester, polyethylene glycol, polyvinyl pyrrolidone, and vinylpyrrolidone vinyl acetate copolymer hydrophilic polymer, polyvinyl acetate, polyurethane, styrene butadiene copolymer, carboxy-modified styrene butadiene copolymer, acrylonitrile Examples include latexes such as butadiene copolymers, methyl acrylate butadiene copolymers, and ethylene vinyl acetate copolymers, but polyurethane resins are relatively soft and have no odor. A particularly preferred because sex is also strong.

  The heat stroke prevention device in which the microcapsules containing the heat storage material thus obtained are carried on the heat stroke prevention device is difficult to rise to 35 ° C or higher even in hot summer environments, and the temperature below that is maintained for a long time. Therefore, it becomes a heat stroke prevention device with extremely excellent comfort.

  Examples of the present invention are shown below. The percentages in the examples are based on mass.

(Preparation of microcapsule slurry)
After adding 15.4 parts by mass of a 37% formaldehyde aqueous solution and 40 parts by mass of water to 12 parts by mass of melamine powder and adjusting the pH to 8, the mixture was heated to about 70 ° C. to obtain an aqueous melamine-formaldehyde condensate aqueous solution. As a heat storage material in 100 parts by mass of a 10% styrene-maleic anhydride copolymer sodium salt solution adjusted to pH 4.5, octadecane (C18) 10%, nonadecane (C19) 80%, eicosane (C20) 8 70 parts by mass of a heat storage material mixture (melting point: 30 ° C., heat of fusion: 150 kJ / kg) consisting of 2% mixture and 2% of other compounds were added with vigorous stirring and emulsification was carried out until the particle size became 3.0 μm. . The total amount of the above melamine-formaldehyde initial condensate aqueous solution is added to the obtained emulsion and stirred at 70 ° C. for 2 hours, then the pH is increased to 9 and water is added to store the heat at a dry solids concentration of 40%. A material microcapsule dispersion was obtained.

Example 1
20 g of the microcapsule dispersion prepared above is filled into a 10 cm square polyethylene bag, sealed so as not to leak out, to obtain a microcapsule filling, and sandwiched between the doubled caps made of polyester fiber The hat of Example 1 was obtained.

Example 2
The microcapsule dispersion prepared above was dried with a spray dryer to obtain powder particles having a diameter of about 0.2 mm. A hat of Example 2 was obtained by processing this powder into a hat that was quilted so as to have a filling amount of 400 g / m ² inside a cloth made of polyester fiber.

Example 3
After the microcapsule dispersion prepared above is dehydrated to 20% or less with a filter press, it is processed into pellets with an average diameter of 1 mm and a length of 2 mm using an extrusion granulator, and granulated heat storage material. I got a thing. A cotton cloth bag filled with 700 g of this granulated material was laminated on the inner wall of the hat made of polyester fiber to obtain the hat of Example 3.

Example 4
Water in advance was 1 m ³ put into a disperser tank 2m ^3, wood pulp (NBKP: Canadian Standard Freeness 480 ml), Manila hemp, and as the microcapsule dispersion each solid ratio is 35:35:30 After mixing and dispersing at a dispersion concentration of 1.0% for 30 minutes, a commercially available cationic yield improver was added, and a web having a dry mass of 25 g / m ² was made with a circular paper machine, and the surface temperature was 130 ° C. The sheet was prepared by drying with a cylinder dryer. The produced sheet was attached to the inner wall of the hat made of polyester fiber to obtain the hat of Example 4.

(Comparative Example 1)
A cloth made of polyester fiber used in Example 2 was processed to obtain a cap of Comparative Example 1.

(Comparative Example 2)
A cap of Comparative Example 2 was obtained in the same manner as Example 4 except that the microcapsule dispersion was not mixed.

  The hats of Examples 1 to 4 and Comparative Examples 1 and 2 were each allowed to cool for 8 hours in an atmosphere of 25 ° C., and then allowed to stand in an atmosphere of 40 ° C. When measured, the caps of Examples 1 to 4 maintained the ceiling inner wall temperature around 30 ° C. even after 2 hours, and did not exceed 34 ° C. even after 4 hours. On the other hand, the caps of Comparative Examples 1 and 2 had a ceiling inner wall temperature exceeding 32 ° C. after 30 minutes, reaching 34 ° C. after 4 hours, and the sustainability of the cooling sensation was inferior to Examples 1-4. Met.

Claims (5)

  A heat stroke prevention device carrying a microcapsule containing a heat storage material.   2. The heat stroke prevention device according to claim 1, wherein the microcapsules are carried on the back surface of the heat stroke prevention device.   The device for preventing heat stroke according to claim 1 or 2, wherein the microcapsule is a solid.   The heat stroke prevention device according to any one of claims 1 to 3, wherein a sheet impregnated or coated with the microcapsules is attached to the inside of the heat stroke prevention device.   The heat stroke prevention device according to any one of claims 1 to 4, wherein the heat storage material has a melting point of about 0 to 40 ° C.