Heat storage material composition and heat storage body thereof

Abstract

To provide a heat storage material composition that has excellent shape retentivity and excels in leak resistance of a heat storage material, and to provide a heat storage body.SOLUTION: A heat storage material composition comprises (A) a heat storage material comprising fatty acid ester, (B) a binder comprising a urethane prepolymer, which is a reaction product between a polyol and an isocyanate, and (C) a curing agent comprising hydrous granules.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a heat storage material composition that is excellent in shape retention and leakage resistance of the heat storage material, and a heat storage body made of the composition. [Background technology]

[0002] BACKGROUND ART In recent years, heat storage technology that effectively utilizes natural energy such as solar heat and geothermal heat, and residual heat from heating and cooling appliances, etc., has been attracting attention as one of the technologies for solving energy problems.

[0003] As a heat storage material used in such heat storage technology, organic latent heat storage materials in particular store heat (heat storage) when the substance changes phase from solid to liquid and release heat (heat dissipation) when the substance changes phase from liquid to solid. Because they have a high latent heat capacity and are easy to handle, research is being conducted toward their practical use.

[0004] To put heat storage materials into practical use, for example, technology is needed to keep the heat storage material in place even when it is in a liquid state, preventing it from leaking or flowing out. For example, there is a method of injecting the heat storage material into a case or bag. While this method allows the heat storage material to be kept inside the case or bag using a simple method, problems have been pointed out, such as the heat storage material being unevenly distributed inside the case or bag, or being unable to adapt to state changes accompanying the liquid-solid state transition, which reduces the heat storage capacity. Another method involves injecting the heat storage material into a capsule. However, even with this method, similar to the above, problems have been pointed out, such as uneven distribution of the heat storage material within the capsule, inability to adapt to changes in state accompanying a liquid-solid state transition, and the capsule wall itself reducing heat storage capacity.

[0005] Meanwhile, the present inventors have discovered a method of obtaining a heat storage body by mixing and reacting an organic latent heat storage material with a polyol and an isocyanate (Patent Document 1). With this method, a large amount of heat storage material can be retained within the polyol-isocyanate three-dimensional crosslinked structure, the heat storage material is not unevenly distributed within the heat storage body, the state change accompanying the liquid-solid state transition can be accommodated, and a heat storage body containing a large amount of heat storage material and exhibiting excellent heat storage properties can be obtained. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2005-98677 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to provide a heat storage material composition that is excellent in shape retention and leakage resistance of the heat storage material, by a method different from that described in the above document. [Means for solving the problem]

[0008] As a result of extensive research aimed at achieving the above-mentioned object, the present inventors have succeeded in obtaining a heat storage material composition comprising (A) a heat storage material containing a fatty acid ester, (B) a binder containing a urethane prepolymer obtained by the reaction of a polyol with an isocyanate, and (C) a curing agent containing a water-containing powder particle, which has excellent shape retention and excellent leakage resistance of the heat storage material, and have thereby completed the present invention.

[0009] That is, the present invention has the following features. 1. A heat storage material composition containing (A) a heat storage material, (B) a binder, and (C) a curing agent, The (A) heat storage material contains a fatty acid ester, the (B) binder contains a urethane prepolymer obtained by reacting a polyol with an isocyanate, The (C) hardener is wood flour, bamboo flour, sawdust, coconut shells, or rice husks. Each Contains one or more types of moisture-containing powder selected from white charcoal, black charcoal, and smoked charcoal A heat storage material composition characterized by: 2. The heat storage material composition according to 1., wherein the moisture content of the moisture-containing powder or granule is 1% by mass or more and 50% by mass or less. 3. The heat storage material composition according to 1. or 2., wherein the size of the water-containing powder and granules is 1 μm or more and 10 mm or less. 4. A heat storage medium formed from the heat storage material composition according to any one of 1. to 3. [Effects of the Invention]

[0010] The heat storage material composition of the present invention can provide a heat storage body that is excellent in shape retention and leakage resistance of the heat storage material. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described.

[0012] The heat storage material composition of the present invention contains (A) a heat storage material (hereinafter also referred to as "component (A)"), (B) a binder (hereinafter also referred to as "component (B)"), and (C) a curing agent (hereinafter also referred to as "component (C)"), and is characterized in that it contains a fatty acid ester as component (A), a urethane prepolymer obtained by reacting a polyol with an isocyanate as component (B), and a water-containing powder as component (C).

[0013] The component (A) used in the present invention contains a fatty acid ester and can be represented, for example, by the following formula (1). (1) R1-C(=O)-O-R2 (R1 and R2 represent alkyl groups. R1 may be linear, branched, cyclic, unsaturated, saturated, or the like, but is not particularly limited thereto; however, a linear saturated alkyl group is preferred. R2 may be linear, branched, cyclic, unsaturated, saturated, or the like, but is not particularly limited thereto; however, a linear saturated alkyl group is preferred.) These components (A) can be used alone or in combination of two or more depending on the application.

[0014] In addition to the fatty acid esters, component (A) may also contain heat storage materials such as hydrocarbon compounds, fatty acids, and aliphatic alcohols. The content of fatty acid ester in component (A) is preferably 50% by weight or more and 100% by weight or less, and more preferably 60% by weight or more and 100% by weight or less, based on the total amount of component (A). For example, hydrocarbon compounds have a high latent heat and are highly compatible with fatty acid esters. Therefore, by mixing hydrocarbon compounds with fatty acid esters, it is possible to adjust the heat storage temperature without reducing the latent heat.

[0015] The component (B) used in the present invention contains a urethane prepolymer obtained by the reaction of a polyol with an isocyanate.

[0016] Examples of polyols include polyester polyols, acrylic polyols, polycarbonate polyols, polyolefin polyols, polyether polyols, polycaprolactone polyols, polytetramethylene glycol polyols, polybutadiene polyols, polyoxypropylene polyols, polyoxypropylene ethylene polyols, epoxy polyols, alkyd polyols, fluorine-containing polyols, silicon-containing polyols, castor oil-based polyols, cellulose and / or derivatives thereof, and polysaccharides such as amylose.

[0017] Examples of polyester polyols include condensation polymers of polyhydric alcohols and polycarboxylic acids; condensation polymers of polyhydric alcohols and hydroxycarboxylic acids; ring-opening polymers of cyclic esters (lactones); reaction products of three or more components selected from polyhydric alcohols, polycarboxylic acids, hydroxycarboxylic acids, and cyclic esters; castor oil or modified products thereof, and the like.

[0018] Examples of polyhydric alcohols include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 1,3-tetramethylenediol, 1,4-tetramethylenediol, 1,2-hexanediol, 1,4-hexanediol, and 1,5-hexanediol. Xanediol, 1,6-hexanediol, 1,3-tetramethylenediol, 1,4-dimethylolhexane, 2-methyl-1,3-trimethylenediol, 1,5-pentamethylenediol, trimethylpentanediol, 2,2,4-trimethyl-1,3-pentanediol, neopentyl glycol, cyclohexanediol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol hexanediol, 2-butyl-2-ethyl-1,3-propanediol, 2-methyl-1,4-butanediol, 1,6-hexamethylenediol, 3-methyl-1,5-pentamethylenediol, 2,4-diethyl-1,5-pentamethylenediol, 2-ethyl-1,3-hexanediol, 1,2-octanediol, 1,8-octanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, 1,2-decanediol, 1,10-decanediol, 1,11-undecanediol, 1,2-dodeca 1,12-dodecanediol, 1,13-tridecanediol, 1,14-tetradecanediol, 1,16-hexadecanediol, 1,18-octadecanediol, 1,12-octadecanediol, 1,20-eicosanediol, meta-xylene glycol, para-xylene glycol, bishydroxyethoxybenzene, bishydroxyethyl terephthalate, glycerin, diglycerin, trimethylolpropane, ditrimethylolpropane, trimethylolethane, cyclohexanediols (1,Examples of suitable solvents include 4-cyclohexanediol, cyclohexanedimethanol, etc., bisphenols (such as bisphenol A), sugar alcohols (such as xylitol and sorbitol), pentaerythritol, dipentaerythritol, 2-methylolpropanediol, ethoxylated trimethylolpropane, etc., and polycondensates thereof, and one or more of these can be used.

[0019] Examples of polycarboxylic acids include aliphatic dicarboxylic acids such as malonic acid, maleic acid, maleic anhydride, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, octadecanedioic acid, and nonadecanedioic acid; Alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid; Aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, orthophthalic acid, phthalic anhydride, terephthalic acid, 2,6-naphthalenedicarboxylic acid, paraphenylenedicarboxylic acid, and trimellitic acid; Dimers to hexamers of unsaturated fatty acids such as palmitoleic acid, oleic acid, linoleic acid, linolenic acid, eicosenoic acid, coconut oil fatty acid, palm oil fatty acid, soybean oil fatty acid, hydrogenated soybean oil fatty acid, linseed oil fatty acid, safflower oil fatty acid, tung oil fatty acid, tall oil fatty acid, dehydrated castor oil fatty acid, castor oil fatty acid, grape seed oil fatty acid, black cumin oil fatty acid, pumpkin kernel oil fatty acid, borage seed oil fatty acid, wheat germ oil fatty acid, rice bran oil fatty acid, peanut oil fatty acid, rapeseed oil fatty acid, sunflower oil fatty acid, corn oil fatty acid, cottonseed oil fatty acid, peanut oil fatty acid, apricot kernel oil fatty acid, pistachio oil fatty acid, almond oil fatty acid, olive oil fatty acid, macadamia nut oil fatty acid, avocado oil fatty acid, sea buckthorn oil fatty acid, sesame oil fatty acid, hemp oil fatty acid, hazelnut oil fatty acid, primrose oil fatty acid, wild rose oil fatty acid, safflower oil fatty acid, and walnut oil fatty acid; One or more of these can be used.

[0020] Examples of hydroxycarboxylic acids include 2-hydroxybutanoic acid, 2-hydroxypentanoic acid, 3-hydroxypentanoic acid, 3-hydroxyhexanoic acid, 2-hydroxyheptanoic acid, 3-hydroxyheptanoic acid, 2-hydroxyoctanoic acid, 3-hydroxyoctanoic acid, 4-hydroxynonanoic acid, 3-hydroxydecanoic acid, 3-hydroxydodecanoic acid, 5-hydroxydodecanoic acid, 3-hydroxytridecanoic acid, 6-hydroxytetradecanoic acid, 2-hydroxypentadecanoic acid, 10-hydroxyhexadecanoic acid, 11-hydroxyheptadecanoic acid, 10-hydroxyoctadecanoic acid, 12-hydroxyoctadecanoic acid, 10-hydroxynonadecanoic acid, 2-hydroxyicosanoic acid, 2- Examples of fatty acids include hydroxytetradocosanoic acid, ricinoleic acid, ricinelaidic acid, cerebronic acid, leucinic acid, salicylic acid, glyceric acid, 3-hydroxypropionic acid, 5-hydroxypentanoic acid, 6-hydroxyhexanoic acid, 7-hydroxyheptanoic acid, 8-hydroxyoctanoic acid, 9-hydroxynonanoic acid, 10-hydroxydecanoic acid, 11-hydroxyundecanoic acid, 12-hydroxydodecanoic acid, 15-hydroxypentadecanoic acid, 16-hydroxyhexadecanoic acid, 19-hydroxynonadecanoic acid, 22-hydroxydocosanoic acid, mevalonic acid, pantoic acid, castor oil fatty acid, dehydrated castor oil fatty acid, and polycondensates thereof. One or more of these fatty acids may be used.

[0021] In the ring-opening polymer of a cyclic ester, examples of the cyclic ester include propiolactone, β-methyl-δ-valerolactone, and ε-caprolactone.

[0022] The polyester polyol can be produced by a conventional method, and known curing agents, curing catalysts, etc. may be used as required.

[0023] Examples of polybutadiene polyols include compounds in which hydroxyl groups are added to a polymer of butadiene or a copolymer of butadiene and a vinyl group-containing monomer such as isoprene or styrene. Furthermore, a vinyl group-containing monomer having a hydroxyl group can also be used.

[0024] Acrylic polyols can also be obtained, for example, by homopolymerizing or copolymerizing an acrylic monomer having one or more hydroxyl groups in one molecule, or by copolymerizing another copolymerizable monomer.

[0025] Examples of polycarbonate polyols include reaction products of polyhydric alcohols and phosgene; ring-opening polymers of cyclic carbonates (such as alkylene carbonates); and the like.

[0026] The polyolefin polyol can be a polyol that contains an olefin as a component of the skeleton (or main chain) of a polymer or copolymer, has at least two hydroxyl groups in the molecule (particularly at the terminals), and has a number average molecular weight of 500 or more. The olefin may be an olefin having a carbon-carbon double bond at the terminal (e.g., α-olefins such as ethylene and propylene), an olefin having a carbon-carbon double bond at a site other than the terminal (e.g., isobutene), or even a diene (e.g., butadiene, isoprene).

[0027] Examples of polyether polyols include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyethylene glycol monoalkyl ether, and polypropylene glycol monoalkyl ether; copolymers containing multiple alkylene oxides as monomer components, such as ethylene oxide-propylene oxide copolymers (alkylene oxide-other alkylene oxide); bisphenol A-type polyether polyols obtained by adding alkylene oxides (e.g., at least one of ethylene oxide, propylene oxide, etc., using bisphenol A as an initiator); and aromatic amine polyols. Examples of such an initiator include aromatic amine-based polyether polyols obtained by adding alkylene oxides to amines (e.g., toluenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, p-phenylenediamine, o-phenylenediamine, naphthalenediamine, triethanolamine, Mannich condensation products, etc.) as initiators; polyether polyols obtained by adding alkylene oxides to glycerin as initiators; and amino group-containing polyether polyols obtained by adding alkylene oxides to low-molecular-weight amines (e.g., ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, neopentyldiamine, etc.) as initiators.

[0028] The isocyanate is not limited as long as it has two or more, preferably 2.2 or more, isocyanate groups in one molecule. For example, 1,3-Trimethylene diisocyanate, 1,4-Tetramethylene diisocyanate, 1,3-Pentamethylene diisocyanate, 1,5-Pentamethylene diisocyanate, 1,6-Hexamethylene diisocyanate (HMDI), 1,2-Propylene diisocyanate, 1,2-Butylene diisocyanate, 2,3-Butylene diisocyanate, 1,3-Butylene diisocyanate, 2-Methyl-1,5 Aliphatic diisocyanates such as pentamethylene diisocyanate, 3-methyl-1,5-pentamethylene diisocyanate, 2,4,4-trimethyl-1,6-hexamethylene diisocyanate, 2,2,4-trimethyl-1,6-hexamethylene diisocyanate, 2,6-diisocyanate methyl caproate, lysine diisocyanate, dimer acid diisocyanate, and norbornene diisocyanate; Alicyclic diisocyanates such as 1,3-cyclopentane diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), methyl-2,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane, 1,4-bis(isocyanatomethyl)cyclohexane, isophorone diisocyanate (IPDI), norbornane diisocyanate, dicyclohexylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated xylylene diisocyanate; m-Phenylene diisocyanate, p-Phenylene diisocyanate, 2,4-Tolylene diisocyanate (TDI), 2,6-Tolylene diisocyanate (TDI), naphthylene-1,4-diisocyanate, naphthylene-1,5-diisocyanate, 4,4'-Diphenyl diisocyanate, 4,4'-Diphenylmethane diisocyanate (MDI), 2,4'-Diphenylmethane diisocyanate, 4,4'-Diphenyl ether Diisocyanates, aromatic diisocyanates such as 2-nitrodiphenyl-4,4'-diisocyanate, 2,2'-diphenylpropane-4,4'-diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, 4,4'-diphenylpropane diisocyanate, 3,3'-dimethoxydiphenyl-4,4'-diisocyanate, dianisidine diisocyanate, and tetramethylene xylylene diisocyanate; Aromatic and aliphatic diisocyanates such as 1,3-xylylene diisocyanate (XDI), 1,4-xylylene diisocyanate (XDI), ω,ω'-diisocyanato-1,4-diethylbenzene, 1,3-bis(1-isocyanato-1-methylethyl)benzene, 1,4-bis(1-isocyanato-1-methylethyl)benzene, and 1,3-bis(α,α-dimethylisocyanatomethyl)benzene; and the like, and derivatives of these isocyanate compounds by allophanation, biuretization, dimerization (uretidione), trimerization (isocyanurate), adductization, carbodiimide reaction, etc., mixtures thereof, and reaction products of these isocyanate compounds with compounds reactive therewith.

[0029] The component (B) of the present invention contains a urethane prepolymer obtained by reacting the above polyol with the above isocyanate. The reaction between the polyol and the isocyanate is not particularly limited and any known method can be used, but it is preferable to mix them so that the NCO / OH molar ratio is preferably in the range of 0.5 to 5.0, more preferably 1.0 to 4.0, and even more preferably 1.2 to 3.0.

[0030] In the present invention, it is particularly preferred to use one or more polyols selected from polyester polyols and polybutadiene polyols, with polyester polyols and polybutadiene polyols being particularly preferred due to their excellent compatibility with fatty acid esters.

[0031] Furthermore, the molecular weight (number average molecular weight) of the polyol is not particularly limited, but is preferably 1000 or more and 8000 or less, and more preferably 1200 or more and 4000 or less. If the molecular weight of the polyol is not less than the above lower limit, the effect of immobilizing the heat storage material is easily exhibited, and if it is not more than the above upper limit, leakage of the heat storage material can be sufficiently suppressed, which is preferable. Here, the molecular weight of the polyol is the number average molecular weight measured by gel permeation chromatography (GPC) and converted into standard polytetrahydrofuran.

[0032] In addition to the urethane prepolymer, other binders can also be used as component (B). Examples of such binders include polycarboxylic acid compounds, polyester resins formed from polyol compounds and polycarboxylic acid compounds, amine compounds, epoxy compounds, epoxy resins formed from amine compounds and epoxy compounds, acrylic resins, silicone resins, alkyd resins, phenolic resins, melamine resins, amino resins, polycarbonate resins, fluororesins, vinyl acetate resins, acrylic-vinyl acetate resins, acrylic-urethane resins, acrylic-silicone resins, silicone-modified acrylic resins, urethane-urea resins, ethylene-vinyl acetate-versatate vinyl ester resins, ethylene-vinyl acetate resins, vinyl chloride resins, ABS resins, AS resins, and synthetic rubbers, including solvent-soluble, NAD, water-soluble, water-dispersible, and solventless types. One or more of these binders can be used.

[0033] The content of the urethane prepolymer in the component (B) is preferably 80% by weight or more and 100% by weight or less of the total amount of the component (B).

[0034] The component (C) used in the present invention contains a water-containing powder or granule. The reaction between the moisture contained in such water-containing powder and granules and the component (B) makes it possible to obtain a flexible and strong heat storage material carrying the component (A) inside, which can flexibly respond to volume changes caused by changes in the liquid-solid state of the heat storage material and has excellent leak resistance. The moisture content of the moisture-containing powder is preferably 1% by mass or more and 50% by mass or less (more preferably 2% by mass or more and 30% by mass or less). Such a moisture content allows for a flexible and strong heat storage medium to be obtained. In the present invention, the content of the moisture-containing powder having such a moisture content is preferably 70% by mass or more and 100% by weight or less of the total amount of component (C). The moisture content of the moisture-containing powder or granule is measured by leaving it to stand for 24 hours under standard conditions (temperature 23°C, relative humidity 50%), then drying it for 24 hours in an incubator at 100°C, and measuring the difference in weight between before and after drying. Specifically, it is calculated using the following formula. Moisture content of wet powder (%) = 100 × (weight before drying - weight after drying) / (weight before drying)

[0035] Examples of such water-containing powders include: Metal oxides and hydrates thereof, such as zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, and aluminum oxide; metal hydroxides and hydrates thereof, such as aluminum hydroxide, magnesium hydroxide, and calcium hydroxide; carbonates such as calcium carbonate, magnesium carbonate, zinc carbonate, and barium carbonate, and their hydrates; Sulfates such as calcium sulfate and barium sulfate and their hydrates, phosphates such as calcium phosphate and their hydrates; titanates such as potassium titanate, sodium titanate, magnesium potassium titanate, and lithium titanate, and hydrates thereof; Borates such as aluminum borate and magnesium borate and their hydrates, silicates such as calcium silicate, aluminum silicate, and magnesium silicate, and hydrates thereof; Clay minerals such as allophane, kaolin, talc, clay, and mica Lightweight foam materials such as glass balloons, fly ash balloons, shirasu balloons, and perlite Silica such as precipitated silica, diatomaceous earth, and quartz Examples include white charcoal, black charcoal, smoked charcoal such as wood flour, bamboo flour, sawdust, coconut shells, and rice husks, as well as open-hearth charcoal, dry-distilled charcoal, briquettes, and the like, and one or more of these can be used. In the present invention, it is particularly preferable to use white charcoal, black charcoal, or smoked charcoal such as wood flour, bamboo flour, sawdust, coconut shells, or rice husks, as such materials allow component (A) to easily penetrate deep into the material, making it possible to obtain a flexible and strong heat storage body. Furthermore, it is possible to achieve a high content of component (A), and to obtain a heat storage body that has excellent leak resistance even with a high content.

[0036] The size of the moisture-containing powder particles is preferably 1 μm or more and 10 mm or less (more preferably 5 μm or more and 8 mm or less). The shape of the moisture-containing powder or granule is not particularly limited and may be spherical, granular, plate-like, rod-like, fibrous, etc., but in the present invention, the major axis of each shape is used to define the size of the moisture-containing powder or granule.

[0037] In addition to the above, component (C) may also contain curing agents such as polyols and amines to the extent that the effects of the present invention are not impaired.

[0038] The present invention is a heat storage composition comprising a mixture of components (A), (B), and (C), and a heat storage body can be obtained by mixing the components and causing a reaction between the components (B) and (C). The mixing method is not particularly limited, but examples include a method of mixing the (A) component with the (B) component and then mixing the (C) component, a method of mixing the (A) component with the (C) component and then mixing the (B) component, and a method of mixing the (B) component with the (C) component and then mixing the (A) component. In the present invention, it is particularly preferred to obtain the heat storage body by a method of mixing the (A) component with the (B) component and then mixing the (C) component. The amount of component (A) mixed may be from 10 to 85% by weight based on the total amount of the heat storage material composition. If it is 10% by weight or more, excellent heat storage properties can be obtained, and if even better heat storage properties are required, it is preferable to use a content of from 30 to 85% by weight, or even from 40 to 80% by weight. The amount of component (B) mixed is preferably 10% by weight or more and 80% by weight or less (more preferably 15% by weight or more and 75% by weight or less) of the total amount of the heat storage material composition. The amount of component (C) mixed is preferably 10% by weight or more and 60% by weight or less (more preferably 15% by weight or more and 50% by weight or less) of the total amount of the heat storage material composition. In the present invention, even when the component (A) is contained in a high content, the leakage resistance is excellent. Furthermore, in the present invention, by using component (C), the flexibility and strength of the heat storage material can be improved. The mixing temperature and reaction temperature are preferably equal to or higher than the melting point of component (A), and in the present invention, are preferably 23°C or higher and 80°C or lower.

[0039] In addition to the above components, the heat storage material composition of the present invention may also contain additives such as layered clay minerals, surfactants, thermally conductive substances, compatibilizers, reaction accelerators, flame retardants, pigments, aggregates, viscosity adjusters, plasticizers, buffers, dispersants, crosslinking agents, pH adjusters, preservatives, antifungal agents, antibacterial agents, anti-algae agents, wetting agents, antifoaming agents, leveling agents, lubricants, dehydrating agents, ultraviolet absorbers, antioxidants, light stabilizers, fibers, fragrances, chemical substance adsorbents, photocatalysts, and moisture absorbing and desorbing powders and granules.

[0040] The reaction accelerator is a catalyst for rapidly promoting the reaction between component (B) and the water in component (C), and examples thereof include amines such as triethylamine, triethylenediamine, triethylamine, tetramethylbutanediamine, dimethylaminoethanol, dimer diamine, and dimer acid polyamidoamine; tin carboxylates such as dibutyltin dilaurate, dibutyltin diacetate, and tin octoate; metal carboxylates such as iron naphthenate, cobalt naphthenate, manganese naphthenate, zinc naphthenate, iron octoate, cobalt octoate, manganese octoate, and zinc octoate; carboxylates such as dibutyltin thiocarboxylate, dioctyltin thiocarboxylate, tributylmethylammonium acetate, and trioctylmethylammonium acetate; and aluminum compounds such as aluminum trisacetylacetate. These may be used alone or in combination of two or more.

[0041] When a reaction accelerator (catalyst) is used, the reaction accelerator is preferably used in an amount of 0.01 to 10 parts by weight, more preferably 0.05 to 5 parts by weight, per 100 parts by weight of component (B). When the amount of reaction accelerator used is in the above ratio, the curing reaction is sufficiently accelerated and discoloration and other problems can be prevented.

[0042] Examples of viscosity modifiers include layered clay minerals such as smectite and vermiculite; amide wax; celluloses such as carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, ethyl cellulose, and cellulose nitrate; polyolefins such as polyethylene and polypropylene; polyacrylic acid-based viscosity modifiers; polyether-based viscosity modifiers; and urethane-based viscosity modifiers, and one or more of these may be used. In particular, in the present invention, it is preferable to use layered clay minerals, and it is particularly preferable to use layered clay minerals that have been organically treated with long-chain alkylammonium ions or the like (organic smectites (organic montmorillonite, organic bentonite, etc.), organic vermiculite, etc.). When a viscosity modifier is used, the viscosity modifier is preferably used in an amount of 0.01 to 10 parts by weight, and more preferably 0.05 to 5 parts by weight, per 100 parts by weight of component (A).

[0043] Examples of wetting agents include modified silicones such as polyether-modified silicone, amino-modified silicone, carbinol-modified silicone, alkyl-modified silicone, alkyl-aralkyl-modified silicone, higher fatty acid ester-modified silicone, higher fatty acid amide-modified silicone, phenyl-modified silicone, carboxyl-modified silicone, and epoxy-modified silicone; nonionic surfactants; anionic surfactants; cationic surfactants; amphoteric surfactants; and polyvinyl alcohol, and one or more of these may be used. In the present invention, it is particularly preferable to use polyether-modified silicones, and for example, polyether-modified silicones such as graft copolymers of polydimethylsiloxane and polyoxyethylene glycol or polyoxyethylene-propylene glycol can be used. When a wetting agent is used, the amount of the wetting agent used is preferably 0.01 to 10 parts by weight, and more preferably 0.05 to 5 parts by weight, per 100 parts by weight of component (C).

[0044] The heat storage material composition of the present invention can be used, for example, in refrigerators and freezers for transporting and storing food, medicines, etc., interior wall materials, exterior wall materials, ceiling materials, floor materials, or laminating materials for buildings such as houses, interior materials for vehicles, etc., thermoelectric conversion systems, heat-retaining materials, protective materials and protective clothing for use in extremely cold regions, hot areas, polar regions, and outer space.

[0045] The heat storage material composition can be used in any shape, including sheet, rod, needle, sphere, square, powder, etc., without any particular limitation, and can be used in various shapes depending on the application. [Example]

[0046] The following examples will be given to clarify the features of the present invention, but the present invention is not limited to these examples.

[0047] [Table 1]

[0048] Example 1 The raw materials and components shown in Table 1 were mixed in the amounts shown to prepare a heat storage material composition, and the composition was placed in a 150 x 75 mm mold at 2.5 kg / m 2 and cured at 50°C for 12 hours to obtain a heat storage material.

[0049] (Curing test) In the hardening test, the heat storage material was hardened at 50°C for 12 hours, and then removed from the formwork and the state of the heat storage material was visually evaluated. The evaluation was as follows. The results are shown in Table 1. ◎: Maintained the shape before removal from the mold ×: The shape before removal from the mold could not be maintained.

[0050] (Leak resistance test) The obtained heat storage body was left to stand in a thermostatic chamber set at 50°C for 24 hours, and then the state of the heat storage body was visually evaluated. The evaluation was as follows. The results are shown in Table 2. ◎: No leakage or bleeding of heat storage material was found ○: Almost no leakage of heat storage material was found ×: Leakage of heat storage material was observed

[0051] Examples 2 to 4 The raw materials and amounts shown in Table 1 were mixed and cured in the same manner as in Example 1, and a curing test and a leak resistance test were carried out. The results are shown in Table 1.

Claims

1. A heat storage material composition containing (A) a heat storage material, (B) a binder, and (C) a curing agent, The (A) heat storage material contains a fatty acid ester, the (B) binder contains a urethane prepolymer obtained by reacting a polyol with an isocyanate, The (C) hardener contains one or more kinds of water-containing powder particles selected from white charcoal, black charcoal, and smoked charcoal of wood flour, bamboo flour, sawdust, coconut shells, and rice husks. A heat storage material composition characterized by:

2. 2. The heat storage material composition according to claim 1, wherein the moisture content of the moisture-containing powder is 1% by mass or more and 50% by mass or less.

3. 3. The heat storage material composition according to claim 1, wherein the size of the water-containing powder particles is from 1 μm to 10 mm.

4. A heat storage body formed from the heat storage material composition according to any one of claims 1 to 3.

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