JP7792238B2 - Heat storage material composition and heat storage body thereof - Google Patents

Description

The present invention relates to a heat storage material composition that exhibits excellent shape retention and leak resistance, and a heat storage medium made from the composition.

In recent years, heat storage technology, which makes effective use of natural energy sources such as solar and geothermal energy, as well as waste heat from heating and cooling appliances, has been attracting attention as one of the technologies that can solve energy problems.

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

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 a bag. While this method allows the heat storage material to be kept in the case or bag by a simple method, problems have been pointed out, such as the heat storage material being unevenly distributed in the case or bag, or being unable to adapt to state changes accompanying a 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.

Meanwhile, the inventors have discovered a method for obtaining a heat storage body by mixing and reacting an organic latent heat storage material with a polyol and an isocyanate (Patent Document 1). This method allows a large amount of heat storage material to be retained within the polyol-isocyanate three-dimensional crosslinked structure, preventing uneven distribution of the heat storage material within the heat storage body and allowing for state changes associated with liquid-solid transitions. It also allows for the production of a heat storage body that contains a large amount of heat storage material and exhibits excellent heat storage properties.

JP 2005-98677

The present invention aims to provide a heat storage material composition that has excellent shape retention and leakage resistance of the heat storage material, using a method different from that described in the above document.

As a result of extensive research aimed at achieving the above objective, 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 and granule, which exhibits excellent shape retention and leak resistance, leading to the completion of the present invention.

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 heat storage material (A) contains a fatty acid ester,
the (B) binder contains a urethane prepolymer obtained by reacting a polyol with an isocyanate,
The heat storage material composition is characterized in that the (C) hardener contains one or more kinds of moisture-containing powder particles selected from the group consisting of white charcoal, black charcoal, and smoked charcoal of wood flour, bamboo flour, sawdust, coconut shells, and rice husks.
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 body formed from the heat storage material composition according to any one of 1. to 3.

The heat storage material composition of the present invention can produce a heat storage body that has excellent shape retention and excellent leakage resistance of the heat storage material.

The following describes how to implement the present invention.

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 and granule as component (C).

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.)
Such component (A) can be used alone or in combination of two or more types depending on the application.

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 the 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.

The component (B) used in the present invention contains a urethane prepolymer obtained by reacting a polyol with an isocyanate.

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 its derivatives, and polysaccharides such as amylose.

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 castor oils, etc.

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, 1,5-hexanediol, 1,6-hexanediol, 1,3-tetramethylenediol, 1,4-dimethyl Tyrolhexane, 2-methyl-1,3-trimethylene diol, 1,5-pentamethylene diol, 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, 2-butyl-2-ethyl-1,3-propanediol, 2-methyl-1,4-butanediol, 1,6-hexamethylene diol, 3-methyl-1,5-pentamethylene diol, 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-dodecanediol, 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 Examples include ethylene glycol, bishydroxyethoxybenzene, bishydroxyethyl terephthalate, glycerin, diglycerin, trimethylolpropane, ditrimethylolpropane, trimethylolethane, cyclohexanediols (1,4-cyclohexanediol, cyclohexanedimethanol, etc.), bisphenols (bisphenol A, etc.), sugar alcohols (xylitol, sorbitol, etc.), pentaerythritol, dipentaerythritol, 2-methylolpropanediol, ethoxylated trimethylolpropane, etc., or polycondensates thereof, and one or more of these can be used.

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 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.

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 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, and one or more of these can be used.

In the ring-opening polymerization product of a cyclic ester, examples of the cyclic ester include propiolactone, β-methyl-δ-valerolactone, and ε-caprolactone.

Polyester polyols can be produced by conventional methods, and known curing agents, curing catalysts, etc. may be used as needed.

Examples of polybutadiene polyols include compounds in which hydroxyl groups have been added to butadiene polymers or copolymers of butadiene and vinyl group-containing monomers such as isoprene or styrene. Additionally, vinyl group-containing monomers containing hydroxyl groups can also be used.

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 it with other copolymerizable monomers.

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

Polyolefin polyols can be used that contain an olefin as a polymer or copolymer backbone (or main chain) component, have at least two hydroxyl groups in the molecule (especially at the terminals), and have a number-average molecular weight of 500 or greater. The olefin may be an olefin having a terminal carbon-carbon double bond (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).

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 (alkylene oxide-other alkylene oxide) such as ethylene oxide-propylene oxide copolymers; bisphenol A-type polyether polyols obtained by adding alkylene oxides (e.g., at least one of ethylene oxide, propylene oxide, etc.; the same applies below) to bisphenol A as an initiator; and aromatic amine polyols. Examples of such initiators include aromatic amine-based polyether polyols obtained by adding alkylene oxides to initiators such as amines (e.g., toluenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, p-phenylenediamine, o-phenylenediamine, naphthalenediamine, triethanolamine, and Mannich condensation products); polyether polyols obtained by adding alkylene oxides to initiators such as glycerin; and amino group-containing polyether polyols obtained by adding alkylene oxides to initiators such as low-molecular-weight amines (e.g., ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, and neopentyldiamine).

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 Aromatic diisocyanates such as diisocyanates, 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 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.

The component (B) of the present invention contains a urethane prepolymer obtained by reacting the above polyol with the above isocyanate.
The reaction of 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 0.5 to 5.0, more preferably 1.0 to 4.0, and even more preferably 1.2 to 3.0.

In the present invention, it is particularly preferable to use one or more polyols selected from polyester polyols and polybutadiene polyols as the polyol. Polyester polyols and polybutadiene polyols are particularly preferred due to their excellent compatibility with fatty acid esters.

The molecular weight (number average molecular weight) of the polyol is not particularly limited, but is preferably 1,000 or more and 8,000 or less, and more preferably 1,200 or more and 4,000 or less. If the molecular weight of the polyol is above the lower limit, it is more likely to exhibit the effect of immobilizing the heat storage material, and if it is below the upper limit, it is preferable because leakage of the heat storage material can be sufficiently suppressed. Here, the molecular weight of the polyol is the number average molecular weight measured by gel permeation chromatography (GPC) in terms of standard polytetrahydrofuran.

In addition to the urethane prepolymer, other binders can also be used as component (B). Examples of such binders include polyester resins formed from polycarboxylic acid compounds, 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 binders. One or more of these binders can be used.

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

The component (C) used in the present invention contains a water-containing powder or granule.
The reaction between the moisture contained in such a 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) therein, which can flexibly respond to volume changes due to 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 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 a value measured by measuring the difference in weight before and after drying when the powder or granule is left to stand for 24 hours under standard conditions (temperature 23°C, relative humidity 50%) and then dried for 24 hours in an incubator at 100°C. Specifically, the value is calculated by the following formula:
Moisture content (%) of moisture-containing powder/granules = 100 × (weight before drying - weight after drying) / (weight before drying)

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;
Examples of suitable materials include clay minerals such as allophane, kaolin, talc, clay, and mica; lightweight foams such as glass balloons, fly ash balloons, shirasu balloons, and perlite; silica such as precipitated silica, diatomaceous earth, and quartz; white charcoal, black charcoal, and smoked charcoal such as wood flour, bamboo flour, sawdust, coconut shells, and rice husks; open-hearth charcoal, dry-distilled charcoal, briquettes, and the like; and these materials can be used alone or in combination of two or more.
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.

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.

In addition to the above, component (C) may also contain curing agents such as polyols and amines to the extent that they do not impair the effects of the present invention.

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 10% by weight or more and 85% by weight or less of the total amount of the heat storage material composition. If the amount 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 an amount of component (A) of 30% by weight or more and 85% by weight or less, or even 40% by weight or more and 80% by weight or less.
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.

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 materials, compatibilizers, reaction accelerators, flame retardants, pigments, aggregates, viscosity modifiers, plasticizers, buffers, dispersants, crosslinking agents, pH adjusters, preservatives, antifungal agents, antibacterial agents, anti-algae agents, wetting agents, antifoaming agents, leveling agents, lubricants, dehydrating agents, UV absorbers, antioxidants, light stabilizers, fibers, fragrances, chemical adsorbents, photocatalysts, and moisture absorbing and releasing powders and granules.

The reaction accelerator is a catalyst that accelerates the reaction between component (B) and the water in component (C). Examples of such accelerators 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.

When a reaction accelerator (catalyst) is used, the reaction accelerator is preferably used in a ratio 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 (B). Using the reaction accelerator in this ratio ensures sufficient acceleration of the curing reaction and prevents discoloration and other problems.

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 the present invention, it is particularly preferable to use a layered clay mineral, and it is particularly preferable to use a layered clay mineral that has been organically treated with a long-chain alkylammonium ion or the like (organic smectite (organic montmorillonite, organic bentonite, etc.), organic vermiculite, etc.).
When a viscosity modifier is used, it 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).

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, it 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 (C).

The heat storage material composition of the present invention can be used, for example, in refrigerators and freezers for transporting and storing food and pharmaceuticals, interior and exterior wall materials, ceiling materials, floor materials, and lamination materials for buildings such as homes, interior materials for vehicles, thermoelectric conversion systems, thermal insulation materials, and protective materials and clothing for use in extremely cold regions, hot areas, polar regions, and outer space.

The heat storage material composition can be used in any shape, including sheet, rod, needle, sphere, square, powder, etc., and can be used in a variety of shapes to suit various applications.

The following examples will clarify the features of the present invention. However, the present invention is not limited to these examples.

Example 1
A heat storage material composition was produced by mixing the raw materials and components in the amounts shown in Table 1, and this was applied to a 150 x 75 mm mold at 2.5 kg/ ^m2 and cured at 50°C for 12 hours to obtain a heat storage body.

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

(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 found.

(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 (4)

A heat storage material composition containing (A) a heat storage material, (B) a binder, and (C) a curing agent,
The heat storage material (A) contains a fatty acid ester,
the (B) binder contains a urethane prepolymer obtained by reacting a polyol with an isocyanate,
The heat storage material composition is characterized in that the (C) hardener contains one or more kinds of moisture-containing powder particles selected from the group consisting of white charcoal, black charcoal, and smoked charcoal of wood flour, bamboo flour, sawdust, coconut shells, and rice husks. The heat storage material composition according to claim 1, characterized in that the moisture content of the moisture-containing powder is 1% by mass or more and 50% by mass or less. The heat storage material composition according to claim 1 or 2, characterized in that the size of the water-containing powder and granules is 1 μm or more and 10 mm or less. A heat storage medium formed from the heat storage material composition according to any one of claims 1 to 3.