WO2025009270A1 - 無機系潜熱蓄熱材組成物およびその利用 - Google Patents

無機系潜熱蓄熱材組成物およびその利用 Download PDF

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WO2025009270A1
WO2025009270A1 PCT/JP2024/017928 JP2024017928W WO2025009270A1 WO 2025009270 A1 WO2025009270 A1 WO 2025009270A1 JP 2024017928 W JP2024017928 W JP 2024017928W WO 2025009270 A1 WO2025009270 A1 WO 2025009270A1
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composition
heat storage
storage material
calcium chloride
temperature
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French (fr)
Japanese (ja)
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友晴 浅野
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Kaneka Corp
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Kaneka Corp
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Priority to JP2025531003A priority patent/JPWO2025009270A1/ja
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • the present invention relates to an inorganic latent heat storage material composition and its use.
  • controlled temperature a specified temperature range
  • Such items are also referred to as “items subject to temperature control.”
  • items subject to temperature control When transporting or storing items subject to temperature control, it is preferable to keep them cool or warm within the controlled temperature range for a specified period of time.
  • latent heat storage material compositions (sometimes called “PCM: Phase Change Materials”) have been developed that are suitable for (i) application to wall materials, floor materials, ceiling materials, etc., and/or (ii) for storing or transporting temperature-controlled items at a constant or nearly constant temperature that must be temperature-controlled at a controlled temperature above 0°C.
  • inorganic latent heat storage material compositions described in Patent Documents 1 and 2 are known.
  • the conventional inorganic latent heat storage material compositions described above have room for improvement in terms of thermal stability.
  • One embodiment of the present invention has been developed in consideration of the above problems, and its purpose is to provide an inorganic latent heat storage material composition that has high thermal stability.
  • the inventors conducted extensive research to solve the above problems, and as a result, completed the present invention.
  • the inorganic latent heat storage material composition according to one embodiment of the present invention is
  • the inorganic latent heat storage material composition contains calcium chloride hexahydrate and a metal soap composed of strontium ions and anions derived from a fatty acid.
  • a method for producing an inorganic latent heat storage material composition includes the steps of: A method for producing an inorganic latent heat storage material composition, comprising any one of the following mixing steps (A) to (C): A mixing step (A) of mixing calcium chloride hexahydrate with a metal soap comprising strontium ions and anions derived from a fatty acid; a mixing step (B) of mixing a dispersion containing a metal soap comprising strontium ions and an anion derived from a fatty acid with one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate and calcium chloride tetrahydrate; or a mixing step (C) of mixing a metal soap comprising strontium ions and an anion derived from a fatty acid with water and one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate and calcium chloride tetrahydrate.
  • an inorganic latent heat storage material composition with high thermal stability.
  • Reference numeral 201 is a perspective view showing a schematic example of a heat storage material according to one embodiment of the present invention
  • reference numeral 202 is an exploded perspective view showing a schematic example of a transport container according to one embodiment of the present invention.
  • Reference numeral 301 is a perspective view that shows the inside of a transport container according to one embodiment of the present invention
  • reference numeral 302 is a cross-sectional view that shows a schematic cross section of 301 taken along line AA.
  • the purpose of the PCM may be (i) to stably maintain an item subject to temperature control at a predetermined temperature, such as room temperature (e.g., 15° C. to 30° C.), and/or (ii) to maintain a living space at a predetermined temperature (e.g., 15° C. to 30° C.).
  • a predetermined temperature such as room temperature (e.g., 15° C. to 30° C.)
  • a predetermined temperature e.g., 15° C. to 30° C.
  • transporting or storing an item subject to temperature control stably at a predetermined temperature is referred to as “constant temperature transport”
  • applications for constant temperature transport may be referred to as “constant temperature transport applications”.
  • organic latent heat storage material compositions are primarily used as latent heat storage material compositions.
  • organic latent heat storage material compositions needed further improvement for one-way constant temperature transport applications due to the following reasons: (i) they are flammable, (ii) the raw materials of the latent heat storage material compositions are often hazardous materials subject to legal restrictions, (iii) the environmental impact is high in the event of leakage, and (iv) the raw materials of the latent heat storage material compositions are expensive.
  • inorganic latent heat storage material compositions that can solve all of the above-mentioned problems (i) to (iv) seen in organic latent heat storage material compositions.
  • inorganic latent heat storage material compositions several inorganic latent heat storage material compositions are known, such as those described in Patent Documents 1 and 2 above.
  • an inorganic latent heat storage material composition containing a metal soap composed of strontium ions and anions derived from fatty acids surprisingly has high thermal stability, leading to the completion of the invention.
  • An inorganic latent heat storage material composition contains (i) calcium chloride hexahydrate and (ii) a metal soap comprising a strontium ion and an anion derived from a fatty acid.
  • the “inorganic latent heat storage material composition” may be referred to as the “composition,” and the “inorganic latent heat storage material composition according to one embodiment of the present invention” may be referred to as the “composition.”
  • high thermal stability means that the difference between the freezing temperature and the supercooling temperature ( ⁇ supercooling) of the composition is small (e.g., less than 5.0°C) after a thermal stability test. That is, the present composition has the advantage that the ⁇ supercooling of the composition is small even after a thermal stability test.
  • the ⁇ supercooling of the composition is preferably less than 5.0°C, more preferably 4.5°C or less, more preferably 4.0°C or less, more preferably 3.5°C or less, even more preferably 3.0°C or less, even more preferably 2.5°C or less, and particularly preferably less than 2.5°C.
  • the composition can be used repeatedly.
  • "repeated use” in relation to an inorganic latent heat storage material composition means repeated melting and solidification of the composition. It is preferable that the difference between the freezing temperature and the supercooling temperature ( ⁇ supercooling) of the composition is small (e.g., less than 5.0°C) even after repeated use (e.g., after a cycle test).
  • the ⁇ supercooling of the composition is preferably 4.5°C or less, more preferably 4.0°C or less, more preferably 3.5°C or less, even more preferably 3.0°C or less, even more preferably 2.5°C or less, and particularly preferably less than 2.5°C.
  • the specific method of the cycle test will be described in detail in the examples below.
  • the difference between the freezing temperature and the supercooling temperature ( ⁇ supercooling) of the composition is small (e.g., less than 5.0°C) even before repeated use (e.g., immediately after the composition is manufactured or before the composition is used (e.g., before solidification)).
  • "before repeated use” may be referred to as "initial”.
  • the initial ⁇ supercooling of the composition is preferably 4.5°C or less, more preferably 4.0°C or less, more preferably 3.5°C or less, even more preferably 3.0°C or less, even more preferably 2.5°C or less, and particularly preferably less than 2.5°C.
  • the lower limit of the difference between the freezing temperature and the supercooling temperature of the composition is not particularly reduced and may be, for example, 0°C. In other words, in any of the above cases, there may be no difference between the freezing temperature and the supercooling temperature of the composition.
  • This composition has the advantage that, by using calcium chloride hexahydrate as the main agent, it is easy to produce a composition with a melting temperature of 15°C to 30°C.
  • inorganic latent heat storage material compositions are known that use, for example, sodium acetate trihydrate, sodium sulfate decahydrate, disodium hydrogen phosphate dodecahydrate, or sodium carbonate decahydrate as a main component.
  • the present composition Compared to such compositions that use inorganic salts other than calcium chloride hexahydrate as a main component, the present composition has the advantages that (i) the composition can be used more suitably in the temperature range assumed to be the environment in which humans live (human habitation), (ii) the temperature of items that are subject to temperature management can be stably maintained at around 15°C to 30°C, and (iii) the resulting composition has excellent durability and less odor.
  • the content of calcium chloride hexahydrate in the composition is not particularly limited and may be appropriately set based on the desired melting temperature and viscosity.
  • the composition preferably contains 50.00% by weight or more of calcium chloride hexahydrate, more preferably 55.00% by weight or more, more preferably 60.00% by weight or more, even more preferably 65.00% by weight or more, and particularly preferably 70.00% by weight or more, based on 100% by weight of the composition.
  • the content of calcium chloride hexahydrate in the composition is within the above-mentioned range, it has the advantages of (i) functioning efficiently as a heat storage material because the amount of latent heat per weight is large, (ii) the obtained composition can be used in a temperature range assuming a human living environment, and (iii) the obtained composition has excellent durability and little odor.
  • the upper limit of the content of calcium chloride hexahydrate in the composition is not particularly limited and may be, for example, 99.99% by weight or less based on 100% by weight of the composition.
  • the present composition contains a metal soap consisting of strontium ions and anions derived from fatty acids.
  • the metal soap can have the function of preventing supercooling of the composition. Therefore, the metal soap can be said to be a "supercooling inhibitor,” a "supercooling suppressant,” a "crystal nucleating agent,” a “nucleating agent,” or a “nucleating agent.”
  • the present composition has the advantage of having high thermal stability.
  • metal soap refers to a "metal soap consisting of strontium ions and anions derived from fatty acids.” More specifically, a metal soap refers to a substance in which a strontium ion (cation) and an anion (anion) derived from a fatty acid are ionicly bonded.
  • fatty acid F in the "anion derived from a fatty acid” may be referred to as "fatty acid F".
  • Fatty acid F is not particularly limited, and examples include conventionally known fatty acids having a hydrocarbon chain and a carboxyl group.
  • Fatty acid F is not limited to linear monocarboxylic acid.
  • Fatty acid F may have a functional group such as a hydroxyl group, and may have a cyclic structure.
  • the hydrocarbon chain in fatty acid F may be linear or may contain branched chains.
  • the hydrocarbon chain in fatty acid F may be saturated or unsaturated. From the viewpoint of suppressing decomposition due to oxidation of the hydrocarbon chain, it is preferable that the hydrocarbon chain in fatty acid F is a saturated hydrocarbon chain. In other words, it is preferable that fatty acid F is a saturated fatty acid.
  • the number of carbon atoms of fatty acid F is not particularly limited, but is preferably 6 or more, more preferably 8 or more, even more preferably 10 or more, and particularly preferably 12 or more. This configuration has the advantage that the metal soap has crystallinity suitable for controlling the particle size of the metal soap.
  • the number of carbon atoms of fatty acid F may be 14 or more, 16 or more, or 18 or more.
  • the upper limit of the carbon number of fatty acid F is not particularly limited, but may be 30 or less, 28 or less, 26 or less, 24 or less, 22 or less, 20 or less, or 18 or less.
  • the lower the carbon number of fatty acid F the lower the cohesive force of the metal soap, making it easier to maintain the particle size of the metal soap. Therefore, the upper limit of the carbon number of fatty acid F is preferably 18 or less, more preferably 16 or less, and even more preferably 14 or less.
  • Fatty acid F is preferably one or more selected from the group consisting of caprylic acid (n-octanoic acid), capric acid (n-decanoic acid), lauric acid (n-dodecanoic acid), myristic acid (n-tetradecanoic acid), palmitic acid (n-hexadecanoic acid) and stearic acid (n-octadecanoic acid), more preferably one or more selected from the group consisting of lauric acid, myristic acid, palmitic acid and stearic acid, and even more preferably lauric acid.
  • This configuration has the advantage that the metal soap has suitable crystallinity.
  • the metal soap is preferably one or more selected from the group consisting of strontium dicaprylate, strontium dicaprate, strontium dilaurate, strontium dimyristate, strontium dipalmitate, and strontium distearate, more preferably one or more selected from the group consisting of strontium dilaurate, strontium dimyristate, strontium dipalmitate, and strontium distearate, and even more preferably strontium dilaurate.
  • This configuration has the advantage that the metal soap has suitable crystallinity.
  • the content of the metal soap in 100% by weight of the composition is not particularly limited, but is preferably 0.01% to 0.10% by weight, more preferably 0.03% to 0.07% by weight, and even more preferably 0.03% to 0.05% by weight.
  • This configuration has the advantage of being able to form a good dispersion state of the metal soap in the composition.
  • the metal soap may be a substance obtained by reacting an aqueous solution containing a strontium salt with an aqueous solution containing a water-soluble metal salt of a fatty acid.
  • water-soluble means that the substance has a solubility of 0.01 g/ml or more in water at 25°C.
  • Strontium salts are water-soluble. Therefore, in an aqueous solution containing a strontium salt, the strontium salt may be ionized, and strontium ions may be present in the aqueous solution.
  • the metal salt may be ionized, and an anion of the fatty acid (an anion derived from the fatty acid) may be present in the aqueous solution. Therefore, by reacting an aqueous solution containing a strontium salt with an aqueous solution containing a water-soluble metal salt of a fatty acid, for example by mixing them, the strontium ion and the anion derived from the fatty acid may be ionically bonded in the resulting mixture, and a metal soap may be produced.
  • fatty acids with 8 or more carbon atoms are themselves poorly water-soluble, in an aqueous solution containing a fatty acid with 8 or more carbon atoms, the fatty acid cannot be ionized, and therefore the anion of the fatty acid cannot be present in the aqueous solution.
  • the strontium salt may be an inorganic salt, such as strontium chloride, strontium chloride hexahydrate, or strontium hydroxide octahydrate.
  • strontium salt one of the above-mentioned compounds may be used alone, or two or more of them may be used in combination.
  • the strontium salt is preferably one or more selected from the group consisting of strontium chloride and strontium chloride hexahydrate, since this can prevent or reduce corrosion of manufacturing equipment, etc.
  • water-soluble metal salts of fatty acids examples include alkali metal salts and alkaline earth metal salts.
  • the water-soluble metal salts of fatty acids one of the above-mentioned compounds may be used alone, or two or more of them may be used in combination.
  • the water-soluble metal salt of the fatty acid is preferably one or more selected from the group consisting of alkali metal salts and alkaline earth metal salts, more preferably one or more selected from the group consisting of alkali metal salts, and even more preferably one or more selected from the group consisting of sodium salts and potassium salts.
  • the above-mentioned fatty acid F is preferably used. Therefore, the preferred aspects of fatty acid F are also preferred for the fatty acid in the "water-soluble metal salt of a fatty acid”.
  • the water-soluble metal salt of a fatty acid is preferably one or more selected from the group consisting of sodium caprylate, sodium caprate, sodium laurate, sodium myristate, sodium palmitate, sodium stearate, potassium caprylate, potassium caprate, potassium laurate, potassium myristate, potassium palmitate, and potassium stearate.
  • This configuration has the advantage of being able to produce a homogeneous metal soap.
  • the metal soap contained in the present composition is a substance obtained by reacting an aqueous solution containing a strontium salt with an aqueous solution containing a water-soluble metal salt of a fatty acid
  • the concentration of the strontium salt in the aqueous solution containing the strontium salt and the amount of the aqueous solution used, as well as the concentration of the metal salt in the aqueous solution containing the water-soluble metal salt of a fatty acid and the amount of the aqueous solution used are not particularly limited, but it is preferable that the amount of the metal soap in the resulting mixture (composition) is an amount that falls within the preferred range of the content of the metal soap in the composition described above.
  • the content of the metal soap in the resulting mixture (composition) can be adjusted to within a desired range.
  • the volume average particle size of the metal soap in the composition is not particularly limited, but is preferably 0.01 ⁇ m to 500.00 ⁇ m, more preferably 0.10 ⁇ m to 100.00 ⁇ m, and even more preferably 0.10 ⁇ m to 10.00 ⁇ m.
  • This configuration has the advantage that good nucleation as a crystal nucleating agent by the metal soap is possible, and a suitable dispersion state of the metal soap can be formed in the composition.
  • the volume average particle size of the metal soap in the composition can be measured with a particle size distribution measuring device that utilizes laser diffraction and/or dynamic light scattering.
  • the composition preferably further comprises one or more inorganic salts selected from the group consisting of bromide salts and chloride salts.
  • inorganic salt S “one or more inorganic salts selected from the group consisting of bromide salts and chloride salts” may be referred to as “inorganic salt S”.
  • the inorganic salt S may have (i) the function of adjusting the melting temperature and/or the solidification temperature of the composition, and/or (ii) the function of preventing supercooling of the composition.
  • a “substance capable of adjusting the melting temperature and/or the solidification temperature of the composition” may be referred to as a “melting point adjuster” or a “freezing point depressant”.
  • a “substance capable of preventing supercooling of the composition” may be referred to as a "supercooling prevention agent", “supercooling suppression agent”, “crystal nucleating agent", “nucleating agent”, or “nucleating agent”.
  • the inorganic salt S may be referred to as a “melting point adjuster” or a “freezing point depressant”, and/or a “supercooling prevention agent”, “supercooling suppression agent”, “crystal nucleating agent”, “nucleating agent”, or “nucleating agent”.
  • calcium chloride hexahydrate and strontium salts are not included in inorganic salts S.
  • calcium chloride hexahydrate, strontium salts strontium bromide and strontium chloride, and main agent precursors calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate are not considered to be inorganic salts S.
  • the amounts of calcium chloride hexahydrate, strontium salts strontium bromide and strontium chloride, and main agent precursors calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate used are not included in the total amount of inorganic salts S used.
  • Bromide salts are preferably water-soluble inorganic salts, such as metal bromides and ammonium bromide.
  • Metal bromides include lithium bromide, sodium bromide, potassium bromide, calcium bromide, magnesium bromide, iron bromide, zinc bromide, barium bromide, etc.
  • As bromide salts one of the above compounds may be used alone, or two or more may be used in combination.
  • the bromide salt preferably contains one or more selected from the group consisting of sodium bromide, potassium bromide, and ammonium bromide, more preferably one or more selected from the group consisting of sodium bromide, potassium bromide, and ammonium bromide, and even more preferably sodium bromide and potassium bromide.
  • chloride salt water-soluble inorganic salts are preferred, and examples thereof include metal chlorides and ammonium chloride.
  • metal chlorides include lithium chloride, sodium chloride, potassium chloride, magnesium chloride, iron chloride, zinc chloride, aluminum chloride, barium chloride, and cobalt chloride.
  • the chloride salt one of the above-mentioned compounds may be used alone, or two or more of them may be used in combination.
  • the chloride salt preferably contains sodium chloride, and more preferably is sodium chloride, because it is easily available and is a versatile melting point adjuster.
  • sodium bromide, potassium bromide, calcium bromide, ammonium bromide, iron bromide, zinc bromide, barium bromide, sodium chloride, potassium chloride, magnesium chloride, iron chloride, zinc chloride and cobalt chloride can function as melting point adjusters.
  • sodium chloride and barium chloride can function as supercooling prevention agents. In other words, sodium chloride can function as both a "melting point adjuster" and a "supercooling prevention agent.”
  • the inorganic salt S is preferably one or more selected from the group consisting of sodium bromide, potassium bromide, potassium chloride and sodium chloride, and more preferably one or more selected from the group consisting of potassium bromide and potassium chloride.
  • the total content of inorganic salt S in the composition is not particularly limited and may be appropriately selected according to the content of calcium chloride hexahydrate in the composition.
  • the composition preferably contains inorganic salt S in a total amount of 1.0% to 45.0% by weight, more preferably 2.0% to 40.0% by weight, even more preferably 3.0% to 35.0% by weight, and particularly preferably 5.0% to 30.0% by weight, based on 100% by weight of the composition.
  • This configuration has the advantages that (i) when the obtained composition is used in building materials such as wall materials, floor materials, ceiling materials, and roof materials, the temperature of the space near the building material or the space covered by the building material can be maintained at an appropriate temperature (for example, 15°C to 30°C) with high accuracy, and (ii) the obtained composition can stably maintain the temperature of an item to be temperature-controlled at around 15°C to 30°C.
  • the composition may further contain a melting point adjuster other than inorganic salt S that can function as a melting point adjuster (hereinafter, sometimes referred to as "other melting point adjusters").
  • other melting point adjusters include (i) ammonium salts other than ammonium bromide and ammonium chloride, (ii) metal halides other than metal bromides and metal chlorides, (iii) metal non-halides, and (iv) urea.
  • the content of ammonium salt contained in the composition is preferably small, since it is easy to handle, has a small environmental impact, and has little odor.
  • the content of ammonium salt contained in the composition is preferably 1.00% by weight or less, more preferably 0.50% by weight or less, even more preferably 0.10% by weight or less, even more preferably 0.01% by weight or less, and particularly preferably 0.00% by weight, based on the total weight of the composition (100% by weight).
  • the composition preferably further contains a lower alcohol.
  • the lower alcohol can have a function of adjusting the melting temperature and/or the freezing temperature of the composition.
  • the lower alcohol can be called a "melting point adjuster” or a "freezing point depressant.”
  • the lower alcohols include alcohols having 5 or less carbon atoms.
  • Specific examples of the lower alcohols include methanol, ethanol, 2-propanol, ethylene glycol, and glycerol. Among these, ethanol is particularly preferred as a lower alcohol.
  • the content of lower alcohols in the composition is not particularly limited and can be set appropriately depending on the amount of calcium chloride hexahydrate in the composition.
  • the composition preferably contains 0.50% to 5.00% by weight of lower alcohols, and more preferably 1.00% to 3.00% by weight, based on 100% by weight of the composition. This composition has the advantage that the melting temperature can be easily adjusted.
  • the present composition preferably further contains a cellulose derivative.
  • the cellulose derivative may have the function of increasing the viscosity of the composition and/or the function of making the composition gel-like.
  • a "substance capable of increasing the viscosity of the composition” or a “substance capable of making the composition gel-like” may be referred to as a "thickening agent” or a “gelling agent”, respectively. That is, the cellulose derivative can be said to be a "thickening agent” or a "gelling agent”.
  • the present composition contains a cellulose derivative
  • it has the advantage that the composition is in a gel state in a temperature environment above the melting temperature.
  • Cellulose derivatives are thermosetting thickeners. Therefore, when the present composition contains a cellulose derivative, it also has the advantage that the composition can be produced efficiently and stably.
  • cellulose derivatives include carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose.
  • the cellulose derivative preferably contains hydroxyethyl cellulose, and more preferably is hydroxyethyl cellulose, because (i) it is nonionic and does not affect inorganic ions dissolved in the composition, and (ii) it can turn an aqueous solution with a high ion concentration into a gel.
  • inorganic salt here is not limited to the inorganic salt S described above, but also includes other inorganic salts
  • precipitation of the inorganic salt may occur over time due to temperature changes.
  • the cellulose derivative not only (i) can turn the composition into a gel, but also (ii) can efficiently disperse the ions of the inorganic salt dissolved in the composition. As a result, the cellulose derivative can inhibit the precipitation of the inorganic salt in the composition.
  • the cellulose derivative in the composition does not affect the melting and/or solidification behavior of the composition, and enables the composition to maintain a high latent heat of fusion.
  • the composition contains a cellulose derivative, it has the advantage that the composition remains in a gel state even after a cycle test or a thermal stability test at the environmental temperature in which the composition is expected to be used.
  • the composition contains a cellulose derivative, the composition remains in a gel state even when in a molten state, and the shape of the composition can be maintained at a certain shape. As a result, even when the composition is in a molten state, there is no risk of environmental pollution, making it possible to reduce the environmental burden.
  • the content of the cellulose derivative in the composition is not particularly limited and can be set appropriately depending on the amount of calcium chloride hexahydrate in the composition.
  • the composition preferably contains 0.3% to 7.0% by weight of the cellulose derivative, more preferably 0.5% to 6.0% by weight, and even more preferably 1.0% to 5.0% by weight, based on 100% by weight of the composition.
  • This composition has the advantages that (i) aggregation and precipitation of salts (both inorganic salts and organic salts) dissolved in the composition can be prevented, (ii) the composition has good handleability, and (iii) the composition is in a gel state in a temperature environment exceeding the melting temperature of the composition.
  • the composition may further contain a thickener other than a cellulose derivative.
  • thickeners other than a cellulose derivative include water-absorbent resins, gelatin, agar, xanthan gum, gum arabic, guar gum, carrageenan, konjac, etc.
  • water-absorbent resins include starch-based resins, acrylate-based resins, and poval-based resins.
  • silica include fumed silica, precipitated silica, and silica gel.
  • the calcium chloride hexahydrate and inorganic salts contained in the composition are often dissolved in the composition in an ionic state. Therefore, as a thickener other than a cellulose derivative, a nonionic thickener is preferred, as it does not affect the inorganic ions dissolved in the composition, and guar gum and/or dextrin are more preferred.
  • the total content of thickeners in the composition is not particularly limited and can be set appropriately depending on the amount of calcium chloride hexahydrate in the composition.
  • the total content of thickeners in the composition is preferably 1 to 10 parts by weight, more preferably 2 to 6 parts by weight, per 100 parts by weight of calcium chloride hexahydrate.
  • This composition has the advantages that (i) aggregation and precipitation of salt dissolved in the composition can be prevented, (ii) the composition has good handleability, and (iii) the composition is in a gel state in a temperature environment exceeding the melting temperature of the composition.
  • the composition may further include a benzoate.
  • the benzoate may have the function of preventing the composition from being supercooled. Therefore, the benzoate may be called a "supercooling inhibitor", a “supercooling inhibitor”, a "crystal nucleating agent", a "nucleating agent” or a “nucleating agent”.
  • the benzoate may also have the function of preventing the composition from being spoiled. Therefore, the benzoate may be called a "preservative".
  • benzoate salts include (i) metal salts of benzoic acid such as sodium benzoate, potassium benzoate, lithium benzoate, and calcium benzoate, and (ii) ammonium benzoate.
  • benzoate salts one of the above-mentioned compounds may be used alone, or two or more of them may be used in combination.
  • the benzoate preferably includes one or more selected from the group consisting of metal salts of benzoic acid and ammonium benzoate, more preferably one or more selected from the group consisting of metal salts of benzoic acid and ammonium benzoate, more preferably one or more selected from the group consisting of sodium benzoate, potassium benzoate and ammonium benzoate, and particularly preferably sodium benzoate.
  • the amount of benzoate contained in this composition is not particularly limited.
  • organic solvents e.g., monocyclic aromatic compounds, more specifically, benzene, toluene, xylene, ethylenebenzene, cumene, paracymene, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, etc.
  • room temperature e.g. 15°C to 30°C
  • the content of organic solvents e.g., monocyclic aromatic compounds that are volatile at room temperature in 100 parts by weight of the total weight of the composition is preferably 50.0 parts by weight or less, 10.0 parts by weight or less, 5.0 parts by weight or less, 1.0 parts by weight or less, 0.5 parts by weight or less, or 0.1 parts by weight or less (the lower limit is 0.0 parts by weight).
  • the total content of one or more compounds selected from the group consisting of benzene, toluene, xylene, ethylenebenzene, cumene, paracymene, dimethyl phthalate, diethyl phthalate, and dipropyl phthalate per 100 parts by weight of the total weight of the composition is 50.0 parts by weight or less, 10.0 parts by weight or less, 5.0 parts by weight or less, 1.0 parts by weight or less, 0.5 parts by weight or less, or 0.1 parts by weight or less (the lower limit is 0.0 parts by weight).
  • the composition may contain other components as necessary, as long as they do not impair the effect of one embodiment of the present invention.
  • other components include solvents, alcohols other than lower alcohols, preservatives, fragrances, colorants, defoamers, flame retardants, light resistance stabilizers, UV absorbers, storage stabilizers, foam regulators, lubricants, antifungal agents, antibacterial agents, polymers, other organic compounds, and other inorganic compounds.
  • the solvent is preferably water in order to increase the flame retardancy of the composition.
  • Alcohols other than the above-mentioned lower alcohols include higher alcohols (e.g., alcohols having 6 or more carbon atoms, such as capryl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, and linoleyl alcohol). Higher alcohols may have the function of adjusting the melting temperature and/or solidification temperature of the composition.
  • higher alcohols e.g., alcohols having 6 or more carbon atoms, such as capryl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, and linoleyl alcohol.
  • Higher alcohols may have the function of adjusting the melting temperature and/or solidification temperature of the composition.
  • the melting temperature of the composition is not particularly limited.
  • the composition preferably has a melting temperature of 15°C to 30°C, more preferably 17°C to 28°C, and even more preferably 18°C to 25°C.
  • This configuration has the advantages that (i) the obtained composition is suitably applied to a house, and the latent heat of the composition can be utilized to easily create a comfortable living environment, and (ii) the obtained composition can stably maintain the temperature of an item to be temperature-controlled at around 15°C to 30°C.
  • the method for measuring the melting temperature of the composition will be described in detail in the examples below.
  • the "melting temperature” may also be referred to as the "melting point".
  • the freezing temperature of the composition is not particularly limited.
  • the composition preferably has a freezing temperature of 15°C to 30°C, more preferably 17°C to 28°C, and even more preferably 20°C to 25°C.
  • This configuration has the advantages that (i) the obtained composition can be suitably applied to a house, and thereby the latent heat of the composition can be utilized to easily create a comfortable living environment, and (ii) the obtained composition can stably maintain the temperature of an item to be subjected to temperature management at approximately 15°C to 30°C.
  • the "freezing temperature” is sometimes referred to as the "freezing point”.
  • the "melting temperature” and the “freezing temperature” are sometimes collectively referred to as the "phase change temperature” or the "phase transition temperature”.
  • the present composition can be suitably used as a latent heat storage material that utilizes (i) the composition absorbing thermal energy during phase transition from a solidified state (solid) to a molten state (liquid or gel state), and (ii) the composition releasing thermal energy during phase transition from a molten state (liquid or gel state) to a solidified state (solid).
  • the "molten state” can also be called the "melted state”.
  • the present composition can maintain, for example, the room temperature at a desired temperature below the ambient temperature even in a high-temperature environment (e.g., summer) by absorbing thermal energy during the phase transition from the solidified state to the molten state.
  • the present composition can maintain, for example, the room temperature at a desired temperature above the ambient temperature even in a low-temperature environment (e.g., winter) by releasing thermal energy during the phase transition from the molten state to the solidified state.
  • the room temperature can be maintained at a desired temperature (e.g., 15°C to 30°C) even in both high-temperature and low-temperature environments.
  • the inorganic latent heat storage material composition according to one embodiment of the present invention can be suitably used in various applications requiring heat storage performance, such as building materials such as wall materials, floor materials, ceiling materials, and roofing materials.
  • the inorganic latent heat storage material composition according to one embodiment of the present invention can be suitably used for constant temperature transport applications of items that require temperature management, such as reactive substances (e.g., adhesives, etc.), precision instruments, semiconductors, pharmaceuticals, investigational drugs, and specimens.
  • the method for producing (preparing) the composition is not particularly limited.
  • the composition can be prepared by any technique known in the technical field of inorganic latent heat storage material compositions.
  • the composition can be prepared, for example, by mixing the above-mentioned components.
  • Inorganic latent heat storage material composition a method for producing an inorganic latent heat storage material composition according to one embodiment of the present invention will be described, but other than the matters detailed below, the description in [2. Inorganic latent heat storage material composition] will be used as appropriate.
  • the "method for producing an inorganic latent heat storage material composition” may be referred to as the "production method”
  • the “method for producing an inorganic latent heat storage material composition according to one embodiment of the present invention” may be referred to as the "present production method”.
  • Inorganic latent heat storage material composition] can be used as the “amount used", “amount blended", or “amount added” of a certain substance (component) in the method for producing the composition.
  • Calcium chloride hexahydrate is commercially available. Meanwhile, calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate are also commercially available. In this manufacturing method, only calcium chloride hexahydrate, which is the main agent, may be used. Meanwhile, in this manufacturing method, one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate may be used in place of a part or all of calcium chloride hexahydrate, which is the main agent.
  • Calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate all (i) form a hydrate (or a hydrate with a higher hydration number) upon contact with water, and (ii) generate heat upon the formation of the hydrate, i.e., exhibit a positive heat of solution.
  • Calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate all can form calcium chloride hexahydrate, which is the main agent, upon contact with water.
  • main agent precursors calcium chloride anhydrous, calcium chloride dihydrate, and calcium chloride tetrahydrate.
  • the method for producing the inorganic latent heat storage material composition preferably includes any one of the following mixing steps (A) to (C): A mixing step (A) of mixing calcium chloride hexahydrate with a metal soap comprising strontium ions and anions derived from a fatty acid; a mixing step (B) of mixing a dispersion containing a metal soap comprising strontium ions and an anion derived from a fatty acid with one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate and calcium chloride tetrahydrate; or a mixing step (C) of mixing a metal soap comprising strontium ions and an anion derived from a fatty acid with water and one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate and calcium chloride tetrahydrate.
  • the device used to mix the components is not particularly limited, and known devices such as mixers such as intensive mixers, stirrers, and shakers can be used as appropriate.
  • a dispersion liquid containing a metal soap composed of strontium ions and anions derived from a fatty acid is mixed with one or more main agent precursors.
  • a dispersion preparation step of preparing a dispersion containing a metal soap may be further performed before the mixing step (B).
  • the present manufacturing method further includes a dispersion preparation step of preparing a dispersion containing a metal soap before the mixing step (B), and in the mixing step (B), the dispersion prepared by the dispersion preparation step may be mixed with one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate.
  • the dispersion preparation step is not particularly limited as long as a dispersion in which the metal soap is dispersed in a solvent (e.g., water) can be obtained.
  • a solvent e.g., water
  • the solvent is preferably water
  • the dispersion is preferably an aqueous dispersion.
  • the dispersion preparation process may be, for example, a process of mixing water and a metal soap.
  • a mixture (dispersion) containing metal soap can be prepared by reacting an aqueous solution containing a strontium salt with an aqueous solution containing a water-soluble metal salt of a fatty acid.
  • an aqueous solution containing a strontium salt with an aqueous solution containing a water-soluble metal salt of a fatty acid
  • the aqueous solution containing a strontium salt and the aqueous solution containing a water-soluble metal salt of a fatty acid may be brought into contact with each other, for example, by simply mixing them.
  • the dispersion preparation step may be a step of mixing an aqueous solution containing a strontium salt with an aqueous solution containing a water-soluble metal salt of a fatty acid. Since a dispersion in which the metal soap is uniformly or approximately uniformly dispersed in the solvent can be obtained, it is preferable that the dispersion preparation step is a step of preparing the dispersion containing the metal soap by reacting an aqueous solution containing a strontium salt with an aqueous solution containing the water-soluble metal salt of the fatty acid.
  • the mixing step (B) instead of the main agent calcium chloride hexahydrate, one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate are used as the main agent precursor.
  • the main agent precursor reacts with water to become the main agent calcium chloride hexahydrate. Therefore, the mixing step (B) can be said to be a step of preparing a mixture containing calcium chloride hexahydrate and a metal soap, i.e., an inorganic latent heat storage material composition.
  • the total amount of calcium chloride anhydrous, calcium chloride dihydrate, and calcium chloride tetrahydrate used can be appropriately set so that the content of calcium chloride hexahydrate in the final composition is the desired amount.
  • the base precursor generates heat as the hydrate is formed, and exhibits a positive heat of solution.
  • the base precursor to be mixed with the aqueous solution is a solid, rather than a solution state in which it has been mixed with water in advance.
  • the mixing step (B) is preferably a step of mixing a dispersion liquid containing a metal soap with one or more solid compounds selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate.
  • water, an inorganic salt S and/or a cellulose derivative may be further mixed as desired.
  • the method and timing of mixing the water, the inorganic salt S and/or the cellulose derivative are not particularly limited.
  • the mixing step (B) may be (i) a step of mixing a dispersion of metal soap, inorganic salt S, and one or more types of main agent precursors, or (ii) a step of mixing a dispersion in which inorganic salt S is dissolved and metal soap is dispersed, and one or more types of main agent precursors.
  • the mixing step (B) is preferably a step of mixing a dispersion in which inorganic salt S is dissolved and metal soap is dispersed, and one or more types of main agent precursors.
  • a dispersion in which the inorganic salt S is dissolved and the metal soap is dispersed is prepared.
  • water, metal soap, and inorganic salt S may be mixed to prepare a dispersion in which the inorganic salt S is dissolved and the metal soap is dispersed,
  • an aqueous solution containing a strontium salt and inorganic salt S may be reacted with an aqueous solution containing a water-soluble metal salt of a fatty acid to prepare a dispersion in which the inorganic salt S is dissolved and the metal soap is dispersed, or
  • an aqueous solution containing a strontium salt may be reacted with an aqueous solution containing a water-soluble metal salt of a fatty acid and inorganic salt S to prepare a dispersion in which the inorganic salt S is dissolved and the metal soap is dispersed.
  • the dispersion preparation step in case A is preferably a step of preparing a dispersion in which the inorganic salt S is dissolved and the metal soap is dispersed by reacting an aqueous solution containing a strontium salt and inorganic salt S with an aqueous solution containing a water-soluble metal salt of a fatty acid.
  • the mixing step (B) may be (i) a step of mixing a dispersion of a metal soap, a cellulose derivative, and one or more types of base precursors, or (ii) a step of mixing a dispersion in which the cellulose derivative and the metal soap are dispersed, and one or more types of base precursors.
  • the mixing step (C) one or more main agent precursors selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate are used in place of the main agent calcium chloride hexahydrate.
  • the main agent precursor reacts with water to become the main agent calcium chloride hexahydrate. Therefore, the mixing step (C) can be said to be a step of preparing a mixture containing calcium chloride hexahydrate and a metal soap, i.e., an inorganic latent heat storage material composition.
  • the total amount of calcium chloride anhydrous, calcium chloride dihydrate, and calcium chloride tetrahydrate used can be appropriately set so that the content of calcium chloride hexahydrate in the final composition is the desired amount.
  • the base precursor generates heat as the hydrate is formed, and exhibits a positive heat of solution.
  • the base precursor to be mixed with the aqueous solution is a solid, rather than a solution state in which it has been mixed with water in advance.
  • the mixing step (C) is preferably a step of mixing a solid metal soap, water, and one or more solid compounds selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate.
  • mixing step (C) water, an inorganic salt S and/or a cellulose derivative may be further mixed as desired.
  • the mixing step (C) there are no particular limitations on the method and timing of mixing the water, the inorganic salt S and/or the cellulose derivative.
  • the mixing step (C) may be (i) a step of mixing a metal soap, inorganic salt S, water, and one or more solid compounds selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate, or (ii) a step of mixing a metal soap, an aqueous solution containing inorganic salt S, and one or more solid compounds selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate, and calcium chloride tetrahydrate.
  • the mixing step (C) may be (i) a step of mixing a metal soap, a cellulose derivative, water, and one or more solid compounds selected from the group consisting of calcium chloride dihydrate and calcium chloride tetrahydrate, or (ii) a step of mixing a metal soap, a dispersion liquid in which the cellulose derivative is dispersed, and one or more solid compounds selected from the group consisting of calcium chloride dihydrate and calcium chloride tetrahydrate.
  • the mixture (composition) obtained by the mixing step may further be mixed with an inorganic salt S and/or a cellulose derivative.
  • any of the mixing steps (A), (B), and (C) it is preferable to stir the mixture obtained by the mixing step.
  • one component may be added to the stirred component while stirring the other component.
  • the device used for stirring and any known device may be used as appropriate.
  • the stirring conditions There are no particular limitations on the stirring conditions.
  • the mixture obtained by the mixing step may be heated in order to improve production efficiency.
  • the device used for the heating is not particularly limited, and any known device may be used as appropriate.
  • the heating may be performed using a heating means provided in the device used to stir the mixture.
  • the heating temperature of the mixture is not particularly limited.
  • a base precursor is used as in the mixing steps (B) and (C)
  • the temperature of the mixture may increase due to the reaction between water and the base precursor in the mixture obtained in the mixing step. Therefore, in the mixing steps (B) and (C), the same advantages as when the mixture is heated can be obtained without using a separate heating means.
  • the heat storage material may be any material that contains (has) the inorganic latent heat storage material composition described above, and other configurations, materials, and the like are not limited.
  • the heat storage material according to one embodiment of the present invention can be used as a latent heat storage material by (i) absorbing thermal energy while the inorganic latent heat storage material composition forming the heat storage material undergoes a phase transition (in other words, melts) from a solidified state (solid) to a molten state (liquid or gel state), and (ii) absorbing thermal energy while the inorganic latent heat storage material composition forming the heat storage material undergoes a phase transition (in other words, solidifies) from a molten state (liquid or gel state) to a solidified state (solid).
  • a phase transition in other words, melts
  • a phase transition in other words, melts
  • a phase transition in other words, solidifies
  • the heat storage material according to one embodiment of the present invention may be a container or bag filled with the inorganic latent heat storage material composition described above.
  • the container or bag is preferably formed mainly from a resin (e.g., a synthetic resin) from the viewpoint of preventing liquid leakage caused by rust and corrosion due to the inorganic latent heat storage material composition.
  • a resin e.g., a synthetic resin
  • the heat storage material according to one embodiment of the present invention contains the inorganic latent heat storage material composition according to one embodiment of the present invention described above and a resin.
  • the resin examples include polyvinyl chloride, polyethylene, polypropylene, polyethylene terephthalate, polystyrene, nylon, and polyester.
  • These materials may be used alone, or in order to improve heat resistance and barrier properties, two or more of these materials may be used in combination (for example, a multi-layer structure may be used). From the standpoint of handling and cost, it is preferable to use containers or bags made of polyethylene.
  • the shape of the container or bag is not particularly limited, but from the viewpoint of efficient heat exchange between the inorganic latent heat storage material composition and the item to be temperature controlled or the space around it via the container or bag, a shape that is thin and ensures a large surface area is preferred.
  • container or bag More specific examples of the container or bag include the container or bag disclosed in Japanese Patent Publication No. 2015-78307. This document is incorporated herein by reference.
  • the melting temperature, solidification temperature, supercooling temperature and ⁇ supercooling of the heat storage material can be considered to be the same as the melting temperature, solidification temperature, supercooling temperature and ⁇ supercooling of the inorganic latent heat storage material composition contained in the heat storage material.
  • Transport Containers The transport container according to one embodiment of the present invention need only contain (have) the heat storage material according to one embodiment of the present invention described above, and other specific configurations, materials, etc. are not particularly limited.
  • FIG. 1 An example of a transport container according to one embodiment of the present invention is shown in FIG. 1.
  • 201 in FIG. 1 is a perspective view that shows a schematic of a heat storage material 10 according to one embodiment of the present invention
  • 202 in FIG. 1 is an exploded perspective view that shows a schematic of a transport container 1 according to one embodiment of the present invention.
  • the opening of the heat storage material 10 of this embodiment is blocked by a heat storage material lid 11.
  • the heat storage material 10 is filled with an inorganic latent heat storage material composition 20 according to one embodiment of the present invention through the opening, and the heat storage material 10 can be stored or placed in an insulated container 40 for use.
  • the transport container according to one embodiment of the present invention includes the heat storage material and the insulated container according to one embodiment of the present invention described above.
  • the materials for the heat storage material 10 and the heat storage material lid 11 are not particularly limited, and any conventionally known material can be used as appropriate.
  • the insulated container 40 is configured to have thermal insulation properties, for example, by using a box body 41 and a lid 42 that fits into the opening 410 of the box body.
  • the material of the insulated container 40 is not particularly limited as long as it has thermal insulation properties, but foamed plastic is preferably used from the viewpoint of being lightweight, inexpensive, and capable of preventing condensation.
  • Vacuum insulation material is preferably used as the material of the insulated container 40 from the viewpoint of having very high thermal insulation properties, a long temperature retention time, and being capable of preventing condensation.
  • foamed polyurethane, polystyrene, polyethylene, polypropylene, AS resin, ABS resin, etc. are used as the foamed plastic.
  • vacuum insulation material is used, for example, with silica powder, glass wool, glass fiber, etc. as the core material.
  • the insulated container 40 may be composed of a combination of foamed plastic and vacuum insulation material.
  • the insulated container 40 with high thermal insulation performance can be obtained by means of (i) covering the outer or inner surfaces of the box body 41 and the lid 42 made of foamed plastic with vacuum insulation material, or (ii) embedding vacuum insulation material inside the walls constituting the box body 41 and the lid 42 made of foamed plastic.
  • FIG. 2 301 in FIG. 2 is a perspective view that shows the inside of the transport container 1, and 302 in FIG. 2 is a cross-sectional view that shows a schematic cross section of line A-A in 301 in FIG. 2.
  • the insulating container 40 includes a box body 41 and a lid 42
  • the transport container 1 according to one embodiment of the present invention includes the insulating container 40, the heat storage material 10, and a spacer 6.
  • the transport container according to one embodiment of the present invention includes the heat storage material, insulating container, and spacer according to one embodiment of the present invention described above.
  • the transport container 1 can also include a spacer 6 to (1) fill the space between the surface of the lid 42 covering the space inside the box body, the side part 412 of the box body, and the bottom part 411 of the box body and the heat storage material 10 when storing or placing the heat storage material 10 in the transport container 1, and (2) to secure the space 5 to store the item to be temperature controlled as shown in 302 of FIG. 2.
  • the transport container 1 is provided with 10 heat storage materials 10, but the number of heat storage materials provided in the transport container 1 is not particularly limited as long as it is one or more. From the viewpoint of storing or transporting the items to be temperature controlled for a long period of time and/or stably at a controlled temperature, the number of heat storage materials 10 provided in the transport container 1 is preferably two or more, more preferably four or more, even more preferably six or more, and particularly preferably ten or more. The number of heat storage materials 10 provided in the transport container 1 may be appropriately selected depending on the size of the heat storage materials 10, the storage or transport time of the items to be temperature controlled, the outside air temperature during storage or transport of the items to be temperature controlled, etc.
  • the material of the spacer 6 is not particularly limited, but examples include polyurethane, polystyrene, polyethylene, polypropylene, AS resin, ABS resin, and foamed plastics made from these resins.
  • a pair of spacers 6 are arranged facing each other inside the insulated container 40.
  • the transport container 1 according to one embodiment of the present invention is provided with the spacers 6, which determines the position of the heat storage material 10, making it possible to easily pack the material.
  • the size and number of the spacers 6 provided in the transport container 1 are not particularly limited, and may be set appropriately depending on the size of the transport container 1, the heat storage material 10, and the item to be temperature managed, etc.
  • the transport container 1 has one space 5 for storing an item to be temperature controlled, but the number of spaces 5 provided in the transport container 1 is not particularly limited as long as it is one or more, and the transport container 1 may have multiple spaces 5.
  • the space 5 may be divided and used by disposing a heat storage material 10 and/or a spacer 6 in one space 5.
  • a transport container according to one embodiment of the present invention can store or transport items that require temperature control (items subject to temperature control) for long periods of time while maintaining the appropriate controlled temperature, regardless of the outside air temperature. Furthermore, since the transport container according to one embodiment of the present invention is equipped with a heat storage material that includes the inorganic latent heat storage material composition, the above-mentioned appropriate controlled temperature can be stably achieved.
  • reactive substances such as adhesives, precision instruments, semiconductors, pharmaceuticals, investigational drugs, specimens, etc. may require a controlled temperature of 15°C to 30°C for storage or transportation.
  • the controlled temperature in the transport container according to one embodiment of the present invention is not particularly limited, but is preferably within the range of 15°C to 30°C, for example. In other words, it is preferable that the transport container according to one embodiment of the present invention is capable of maintaining the items subject to temperature control within the range of 15°C to 30°C for a long period of time.
  • the transport container according to one embodiment of the present invention can also be called an "insulating container.”
  • Examples of uses for a transport container that stores or transports items subject to temperature control while maintaining the temperature at 15°C to 30°C include the storage and/or transportation of items subject to temperature control, such as reactive substances such as adhesives, precision instruments, semiconductors, pharmaceuticals, investigational drugs, specimens, etc.
  • one embodiment of the present invention includes the following configuration.
  • An inorganic latent heat storage material composition comprising calcium chloride hexahydrate and a metal soap comprising strontium ions and anions derived from a fatty acid.
  • a heat storage material comprising the inorganic latent heat storage material composition described in any one of [1] to [8].
  • a method for producing an inorganic latent heat storage material composition comprising any one of the following mixing steps (A) to (C): A mixing step (A) of mixing calcium chloride hexahydrate with a metal soap comprising strontium ions and anions derived from a fatty acid; a mixing step (B) of mixing a dispersion containing a metal soap comprising strontium ions and an anion derived from a fatty acid with one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate and calcium chloride tetrahydrate; or a mixing step (C) of mixing a metal soap comprising strontium ions and an anion derived from a fatty acid with water and one or more selected from the group consisting of calcium chloride anhydrate, calcium chloride dihydrate and calcium chloride tetrahydrate.
  • the inorganic latent heat storage material compositions obtained in the examples and comparative examples were filled into polypropylene cryovials with a volume of 2 ml together with a thermocouple.
  • the cryovials were left in an environment of 5°C or less for a certain period of time, and the temperature of the composition in the cryovial was reduced to 5°C or less and solidified.
  • the cryovials were placed in an ultra-low temperature thermostatic bath (Cryoporter (registered trademark) CS-75CP, manufactured by Synix Co., Ltd.). Next, the temperature of the thermostatic bath was raised from 5°C to 50°C at a heating rate of 1.0°C/min.
  • the temperature of the composition in the thermostatic bath was monitored with a thermocouple during the temperature rise process of the thermostatic bath, and the obtained results (temperature) were plotted against time to obtain a graph.
  • the temperature of the composition changed in the following order (1) to (3) compared with the temperature of the thermostatic bath, which was raised at a constant rate: (1) The temperature rose from 5° C. to a certain temperature (temperature T1 ) at a constant or approximately constant rate; (2) The temperature hardly changed from temperature T1 to a certain temperature (temperature T2 ) due to the latent heat of the composition; (3) At temperature T2 , the temperature began to rise again. The midpoint temperature between temperatures T1 and T2 was calculated as the melting temperature of the composition.
  • the inorganic latent heat storage material compositions obtained in the examples and comparative examples were filled into the cryovials having a volume of 2 ml together with a thermocouple.
  • the cryovials were left in an environment of 50° C. or higher for a certain period of time, and the temperature of the composition in the cryovial was increased to 50° C. or higher and melted.
  • the cryovials were left stationary in the ultra-low temperature thermostatic bath. Next, the temperature of the thermostatic bath was decreased from 50° C. to 5° C. at a rate of 1.0° C./min.
  • the temperature of the composition in the thermostatic bath was monitored with a thermocouple during the temperature decrease process of the thermostatic bath, and the obtained results (temperature) were plotted against time to obtain a graph.
  • the temperature of the composition changed in the following order (1) to (3) compared with the temperature of the thermostatic bath, which decreased at a constant rate: (1) The temperature was decreased from 50° C. to a certain temperature (temperature T4 ) at a constant or approximately constant rate; (2) After the temperature rises slightly from T4 to a certain temperature (temperature T5 ), the composition hardly changes from temperature T5 to a certain temperature (temperature T6 ) due to the latent heat of the composition; (3) At temperature T6 , the temperature began to decrease again.
  • the temperature T4 was defined as the supercooling temperature of the composition
  • the temperature T5 was defined as the solidification temperature of the composition.
  • the difference (temperature difference) between the temperature T4 (supercooling temperature) and the temperature T5 (solidification temperature) was calculated as ⁇ supercooling (°C) of the composition.
  • compositions in which the above (2) and (3) were not observed This means that the composition did not solidify while the temperature of the thermostatic bath was lowered from 50°C to 5°C at a temperature drop rate of 1.0°C/min.
  • "-" is indicated in the columns for solidification temperature, supercooling temperature, and ⁇ supercooling in Table 2.
  • cycle tests were carried out by the following methods (1) to (6): (1) The composition was loaded into the cryovial along with a thermocouple; (2) leaving the cryovial in an environment of 5°C or less for a certain period of time to reduce the temperature of the composition in the cryovial to 5°C or less; (3) The cryovial was placed in the ultra-low temperature incubator; (4) Next, the temperature of the thermostatic bath was increased from 5° C. to 50° C. at a rate of 1.0° C./min; (5) Subsequently, the temperature of the thermostatic bath was decreased from 50° C. to 5° C. at a rate of 1.0° C./min; (6) The above operations (4) and (5) (collectively referred to as a temperature change cycle) were repeated a total of 20 times.
  • Thermal Stability Test In order to evaluate the degree of thermal stability of the composition, i.e., the degree of ⁇ supercooling of the composition after the thermal stability test, the thermal stability test was carried out by the following methods (1) to (5): (1) The composition was loaded into the cryovial along with a thermocouple; (2) The cryovial was left in an environment of 50° C. or higher, and the composition in the cryovial was left standing at 50° C. for 24 hours; (3) leaving the cryovial in an environment of 5°C or less for a certain period of time to reduce the temperature of the composition in the cryovial to 5°C or less; (4) The cryovial was placed in the ultra-low temperature incubator; (5) Next, the temperature of the thermostatic bath was increased from 5° C. to 50° C. at a temperature increase rate of 1.0° C./min; (6) Next, the temperature of the thermostatic chamber was decreased from 50° C. to 5° C. at a rate of 1.0° C./min.
  • Example 1 Water was mixed with calcium chloride dihydrate, a main agent precursor, to obtain calcium chloride hexahydrate. The amount of water mixed with calcium chloride dihydrate was adjusted so that the total amount of water reacted with the total amount of calcium chloride dihydrate to form calcium chloride hexahydrate.
  • Examples 2 to 4, Comparative Examples 1 to 10 The compositions of Examples 2 to 4 and Comparative Examples 1 to 10 were produced in the same manner as in Example 1, except that the type and amount of each component was changed so as to obtain compositions having the composition shown in Table 1.
  • Table 1 the content of each component in the composition is shown in weight percent.
  • the melting temperature, solidification temperature, and supercooling temperature of the obtained compositions were calculated by the above-mentioned method at the initial stage, after the cycle test, and after the thermal stability test. Furthermore, the degree of ⁇ supercooling of the compositions was evaluated at the initial stage, after the cycle test, and after the thermal stability test. The results are shown in Tables 2 and 3.
  • Example 5 (Aqueous solution preparation process) 31.93 parts by weight of water, 0.3 parts by weight of potassium bromide, and 0.1 parts by weight of strontium chloride hexahydrate were added to a BeMixer (manufactured by Yasuda Finetech Co., Ltd.), and the mixture was stirred until all the raw materials in the BeMixer were completely dissolved in water and a colorless and transparent aqueous solution was obtained. Then, 1.0 part by weight of a 5% (w/w) aqueous solution of potassium laurate was added to the obtained aqueous solution, and the obtained mixture was stirred for 10 minutes with the BeMixer. By this operation, a dispersion containing strontium dilaurate as a metal soap was obtained.
  • Cellulose derivative addition step 1.0 parts by weight of hydroxyethyl cellulose was added to the mixture obtained as a cellulose derivative, and the temperature of the mixture obtained was raised to 50°C. The mixture was stirred for 60 minutes while maintaining the temperature of the mixture at 50°C to obtain a gel composition.
  • Table 1 the content of each component in the composition is shown in weight percent.
  • the melting temperature, solidification temperature, and supercooling temperature of the obtained composition were calculated by the above-mentioned method at the initial stage, after the cycle test, and after the thermal stability test. Furthermore, the degree of ⁇ supercooling of the composition was evaluated at the initial stage, after the cycle test, and after the thermal stability test. The results are shown in Tables 2 and 3.
  • Example 6 to 11 The compositions of Examples 6 to 11 were produced in the same manner as Example 5, except that the type and amount of each component were changed so that the compositions shown in Table 1 were obtained.
  • Table 1 the content of each component in the composition is shown in weight percent.
  • the composition of Example 6 contained strontium dimyristate as the metal soap, and the composition of Example 7 contained strontium distearate as the metal soap.
  • the melting temperature, solidification temperature, and supercooling temperature of the obtained compositions were calculated by the above-mentioned method at the initial stage, after the cycle test, and after the thermal stability test. Furthermore, the degree of ⁇ supercooling of the compositions was evaluated at the initial stage, after the cycle test, and after the thermal stability test. The results are shown in Tables 2 and 3.
  • Examples 5-11 calcium chloride dihydrate was used as the base precursor rather than the base (calcium chloride hexahydrate).
  • the total amount of calcium chloride dihydrate in the mixture reacted with the total amount of water in the mixture to form calcium chloride hexahydrate.
  • the amount of calcium chloride hexahydrate contained in the composition was calculated and is shown in Table 1 under the column "Calcium chloride hexahydrate.”
  • an inorganic latent heat storage material composition having high thermal stability.
  • the inorganic latent heat storage material composition according to one embodiment of the present invention can be suitably used as a heat storage material, for example, (i) in wall materials, floor materials, ceiling materials, roof materials, and undercoats for floor mats, and (ii) in constant temperature transport applications for items that require temperature management.

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JPS539596B2 (https=) * 1974-11-08 1978-04-06
JPS57141479A (en) * 1981-02-25 1982-09-01 Matsushita Electric Works Ltd Heat-accumulating agent
JPS57164184A (en) * 1981-04-02 1982-10-08 Mitsubishi Electric Corp Heat-accumulating material
JPS5899695A (ja) * 1981-12-09 1983-06-14 Hitachi Ltd 蓄熱材料
JPS601279A (ja) * 1983-06-17 1985-01-07 Mitsui Petrochem Ind Ltd 蓄熱剤組成物
JPS60155285A (ja) * 1984-01-23 1985-08-15 Mitsui Eng & Shipbuild Co Ltd 蓄熱材組成物
JPS6462382A (en) * 1987-09-01 1989-03-08 Kubota Ltd Heat storage material composition
WO2007099798A1 (ja) * 2006-02-28 2007-09-07 Yano R & D Corp. 蓄熱材組成物
JP2022090880A (ja) * 2020-12-08 2022-06-20 スズキ株式会社 潜熱蓄熱装置およびそれに用いる過冷却防止媒体の製造方法
WO2022255281A1 (ja) * 2021-05-31 2022-12-08 株式会社カネカ 蓄熱剤組成物の製造方法

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS539596B2 (https=) * 1974-11-08 1978-04-06
JPS57141479A (en) * 1981-02-25 1982-09-01 Matsushita Electric Works Ltd Heat-accumulating agent
JPS57164184A (en) * 1981-04-02 1982-10-08 Mitsubishi Electric Corp Heat-accumulating material
JPS5899695A (ja) * 1981-12-09 1983-06-14 Hitachi Ltd 蓄熱材料
JPS601279A (ja) * 1983-06-17 1985-01-07 Mitsui Petrochem Ind Ltd 蓄熱剤組成物
JPS60155285A (ja) * 1984-01-23 1985-08-15 Mitsui Eng & Shipbuild Co Ltd 蓄熱材組成物
JPS6462382A (en) * 1987-09-01 1989-03-08 Kubota Ltd Heat storage material composition
WO2007099798A1 (ja) * 2006-02-28 2007-09-07 Yano R & D Corp. 蓄熱材組成物
JP2022090880A (ja) * 2020-12-08 2022-06-20 スズキ株式会社 潜熱蓄熱装置およびそれに用いる過冷却防止媒体の製造方法
WO2022255281A1 (ja) * 2021-05-31 2022-12-08 株式会社カネカ 蓄熱剤組成物の製造方法

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