heat storage material composition

Abstract

To provide a heat storage material composition which enables heat storage and heat dissipation and can be stably used repeatedly even in a high-temperature environment.SOLUTION: There is provided a heat storage material composition which comprises a solid-liquid phase change material containing zinc nitrate, a nucleating material and a nucleating material aid containing a silicon-containing fine powder or a carbon-containing fine powder. The nucleating material is barium hydroxide and strontium chloride, the silicon-containing fine powder is fly ash or a silica gel and the carbon-containing fine powder is carbon black. The concentration of the nucleating material is in the range of 0.001 wt.% to 0.100 wt.% based on the whole heat storage material composition and the concentration of the nucleating material aid is in the range of 0.050 wt.% to 5.000 wt.% based on the whole heat storage material composition. Thus, heat storage and heat dissipation are enabled and stable repeated use is possible even in a high-temperature environment. The heat storage material composition is useful for a heat storage material in various fields.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a heat storage material composition. [Background technology]

[0002] Conventionally, heat storage materials (latent heat storage materials, sensible heat storage materials, heat storage materials, etc.) that store heat (heat absorption) and release heat (heat release) by utilizing a phase change (solid-liquid phase change) between solid and liquid within a predetermined temperature range have been known. Heat storage materials are widely used in various fields, for example, in air conditioning systems for buildings (houses, office buildings, etc.) that require a large amount of cold or hot heat, and in waste heat recovery systems for factories.

[0003] As a technology relating to a heat storage material using zinc nitrate, for example, Japanese Patent Laid-Open Publication No. 59-13898 (Patent Document 1) discloses a heat storage material obtained by adding at least one of strontium hydroxide or its octahydrate and barium hydroxide or its octahydrate as a nucleating agent to zinc nitrate hexahydrate. It is claimed that this makes it possible to provide a latent heat storage material that reduces the degree of supercooling during solidification.

[0004] Furthermore, Japanese Patent Laid-Open Publication No. 60-44578 (Patent Document 2) discloses a heat storage material comprising at least sodium acetate trihydrate and one or more nitrates selected from the group consisting of anhydrous or hydrated lithium nitrate, sodium nitrate, potassium nitrate, zinc nitrate, and magnesium nitrate, which is claimed to provide a heat storage material having a lower melting point than sodium acetate hexahydrate and with little loss of heat storage capacity.

[0005] Furthermore, Japanese Patent Laid-Open Publication No. 60-203690 (Patent Document 3) discloses a heat storage material in which a compound selected from the group consisting of magnesium hydroxide, magnesium metasilicate, magnesium orthosilicate, magnesium calcium metasilicate, and zinc hydroxide is added to zinc nitrate hexahydrate in an amount equal to or greater than the solubility in a saturated aqueous solution of zinc nitrate, thereby making it possible to provide a heat storage material mainly composed of zinc nitrate hexahydrate.

[0006] Furthermore, Japanese Patent Laid-Open Publication No. 61-89284 (Patent Document 4) discloses a heat storage material composition containing calcium chloride hexahydrate as the main component, and in which zinc fluoride tetrahydrate and / or zinc nitrate hexahydrate is blended as a freezing point regulator. This discloses that by using a specific compound as the freezing point regulator, it is possible to set the freezing point to any temperature within a wide range with a small blending ratio, and furthermore, it is possible to provide a heat storage material composition with a high level of latent heat at a relatively low cost. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Unexamined Patent Publication No. 13898 / 1983 [Patent Document 2] Japanese Patent Publication No. 60-44578 [Patent Document 3] Japanese Patent Application Publication No. 60-203690 [Patent Document 4] Japanese Patent Application Publication No. 61-89284 Summary of the Invention [Problem to be solved by the invention]

[0008] As global warming continues, the ambient environment is becoming hotter. Therefore, there is a growing demand for heat storage material compositions that can undergo solid-liquid phase changes even in high-temperature environments and achieve heat storage and heat release effects.

[0009] Here, in a heat storage material composition using zinc nitrate as a solid-liquid phase change material, even if a nucleating material is added, when the lower limit of the ambient temperature is, for example, a relatively high 30°C, the phase change from liquid to solid does not occur, and the heat storage and heat release effect cannot be obtained. This problem cannot be solved by the techniques described in the above-mentioned Patent Documents 1 to 4.

[0010] Therefore, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a heat storage material composition that is capable of storing and releasing heat even in a high-temperature environment and can be used repeatedly and stably. [Means for solving the problem]

[0011] The heat storage material composition according to the present invention contains a solid-liquid phase change material containing zinc nitrate, a nucleating material, and a nucleating assistant containing a silicon-containing fine powder or a carbon-containing fine powder. [Effects of the Invention]

[0012] According to the present invention, heat storage and release become possible even in a high-temperature environment, and stable repeated use becomes possible. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a table showing ingredients of the heat storage material compositions of Examples 1-3 and Comparative Example 1. [Figure 2] 1 is a graph showing the temperature changes of the heat storage material compositions of Examples 1-3 and Comparative Example 1 during the fifth heat cycle. [Figure 3] 1 is a table showing ingredients of the heat storage material compositions of Examples 4-6 and Comparative Example 1. [Figure 4] 1 is a graph showing the temperature changes of the heat storage material compositions of Examples 4-6 and Comparative Example 1 during the fifth heat cycle. [Figure 5] 1 is a table showing ingredients of the heat storage material composition of Examples 7-8. [Figure 6] 1 is a graph showing the temperature change of the heat storage material composition of Example 7-8 during the 15th to 17th heat cycles. [Figure 7] 1 is a table showing ingredients of the heat storage material compositions of Examples 1-2 and 9. [Figure 8] 1 is a graph showing the temperature change of the heat storage material compositions of Examples 1-2 and 9 during the 35th heat cycle. [Figure 9] 1 is a table showing ingredients of the heat storage material compositions of Examples 5 and 10. [Figure 10]1 is a graph showing the temperature changes of the heat storage material compositions of Examples 5 and 10 during the 25th heat cycle. [Figure 11] 1 is a table showing ingredients of the heat storage material composition of Example 11. [Figure 12] 10 is a graph showing the temperature change of the heat storage material composition of Example 11 during the sixth heat cycle. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings to help understand the present invention. Note that the following embodiment is an example of the present invention and is not intended to limit the technical scope of the present invention.

[0015] The inventors have been researching heat storage material compositions using zinc nitrate as a solid-liquid phase change material for many years, and have confirmed that when the ambient temperature of a heat storage material composition containing zinc nitrate drops, for example, from 80 degrees to 30 degrees, the zinc nitrate solid-liquid phase change material does not change phase from liquid to solid, and the heat storage and heat release effects are not obtained.

[0016] Furthermore, it has been confirmed that even if the ambient temperature is lowered, for example, from 80°C to 30°C after adding a nucleating agent to the heat storage material composition, no phase change of zinc nitrate occurs.

[0017] Therefore, the present inventors further focused on the nucleation assistant material and completed the present invention based on the examples described below.

[0018] That is, the heat storage material composition according to the present invention contains a solid-liquid phase change material containing zinc nitrate, a nucleating material, and a nucleating assistant containing silicon-containing fine powder or carbon-containing fine powder, thereby enabling heat storage and release even in high-temperature environments and enabling stable repeated use.

[0019] In other words, by adding silicon-containing fine powder or carbon-containing fine powder, when the ambient temperature drops, for example, from 80 degrees to 30 degrees, it becomes possible to promote nucleation of the nucleating material, causing the zinc nitrate solid-liquid phase change material to change from liquid to solid, thereby achieving the effects of heat storage and heat dissipation.

[0020] In this way, by combining a nucleating material and a nucleating assistant material for a solid-liquid phase change material containing zinc nitrate, it is possible to promote nucleation of the nucleating material, thereby enabling the heat storage and release of the heat storage material composition even in high temperature environments ranging from 80 to 30 degrees.

[0021] Furthermore, in a heat cycle in which the temperature is lowered from a high temperature to a low temperature and then raised back to a high temperature, the presence of the silicon-containing fine powder or carbon-containing fine powder as a nucleation assistant allows the heat storage material composition to repeatedly melt and solidify, stably storing and releasing heat and suppressing supercooling, thereby enabling repeated use over a long period of time.

[0022] Here, the type of solid-liquid phase change material containing zinc nitrate is not particularly limited, but for example, zinc nitrate anhydride {Zn(NO3)2} or its hexahydrate {Zn(NO3)2·6H2O} can be used. Also, zinc nitrate anhydride and hexahydrate may be used in combination as appropriate.

[0023] Although the solid-liquid phase change material other than zinc nitrate undergoes a different temperature range for the phase change, it undergoes a phase change similar to that of zinc nitrate within a predetermined temperature range, thereby storing and releasing heat. Other solid-liquid phase change materials may be included, for example, calcium chloride, sodium acetate, sodium hydrogen phosphate, etc. These may be anhydrous or hydrated. Furthermore, one type of other solid-liquid phase change material may be used, or two or more types may be used in combination.

[0024] There are no particular limitations on the concentration of the solid-liquid phase change material, but it is preferably within the range of 75.000% by weight to 99.500% by weight, and more preferably within the range of 80.000% by weight to 99.500% by weight, based on the total heat storage material composition.

[0025] Furthermore, the type of nucleation material is not particularly limited, and examples thereof include barium hydroxide {Ba(OH)}, barium chloride (BaCl), barium dioxide (BaCO), barium sulfate (BaSO), barium nitrate {Ba(NO)}, potassium bromide (KBr), sodium bromide (NaBr), strontium chloride (SrCl), strontium hydroxide {Sr(OH)}, etc. Since these nucleation materials form hydrates depending on the type, anhydrides or hydrates thereof may be used, or these may be combined as appropriate.

[0026] The nucleation material may be one type or a suitable combination of two or more types. When two or more types of nucleation materials are added, there is no particular limitation on the ratio thereof. For example, the mixing ratio of barium hydroxide as the first nucleation material to strontium hydroxide as the second nucleation material is preferably within a range of 1.0:0.2 to 1.0:2.0 by weight, and more preferably within a range of 1.0:0.5 to 1.0:1.5 by weight.

[0027] There are no particular limitations on the concentration of the nucleating material, but it is preferably within the range of 0.001% by weight to 0.100% by weight, and more preferably within the range of 0.001% by weight to 0.050% by weight, based on the total heat storage material composition.

[0028] The type of silicon-containing fine powder used as the nucleation assistant is not particularly limited, but examples thereof include fly ash, silica gel, silica sand (quartz sand), glass beads, slag powder, silica cement, diatomaceous earth, microsilica (silica stone powder), etc. These silicon-containing fine powders may be used alone or in combination of two or more types.

[0029] The average particle size of the silicon-containing fine powder is not particularly limited, but is preferably in the range of 0.01 μm to 100.00 μm, and more preferably in the range of 0.1 μm to 50.00 μm. The average particle size of the silicon-containing fine powder can be measured, for example, by using a photon correlation method (dynamic light scattering method) or a laser diffraction / scattering method (static light scattering method).

[0030] The type of carbon-containing fine powder used as the nucleation assistant is not particularly limited, but examples thereof include carbon black, graphite fine powder, carbon fiber fine powder, carbon nanotube fine powder, etc. These carbon-containing fine powders may be used alone or in combination of two or more types.

[0031] Here, carbon black refers to a spherical or chain-like conductive substance in the form of fine powder produced by gas-phase thermal decomposition or incomplete combustion of natural gas or hydrocarbon gas. There are no particular limitations on the type of carbon black, but examples include acetylene black, furnace black, thermal black, and channel black. These types of carbon black may also be used in combination.

[0032] The average particle size of the carbon-containing fine powder is not particularly limited, but is preferably in the range of 0.01 μm to 100.00 μm, and more preferably in the range of 0.1 μm to 50.00 μm. The average particle size of the carbon-containing fine powder can be measured by, for example, the photon correlation method or the laser diffraction / scattering method, as described above.

[0033] The nucleation assistant may be one kind or a suitable combination of two or more kinds. When two or more kinds of nucleation assistants are added, there is no particular limitation on the ratio thereof. For example, the mixing ratio of the silicon-containing fine powder of the first nucleation assistant to the carbon-containing fine powder of the second nucleation assistant is preferably within a range of 1.0:0.2 to 1.0:2.0 by weight, and more preferably within a range of 1.0:0.5 to 1.0:1.5 by weight.

[0034] There are no particular limitations on the concentration of the nucleation assistant, but it is preferably within the range of 0.05% by weight to 5,000% by weight, and more preferably within the range of 0.10% by weight to 3,000% by weight, based on the total heat storage material composition.

[0035] There is no particular limitation on the mixing ratio of the nucleation material and the nucleation assisting material. For example, the mixing ratio of the nucleation material and the nucleation assisting material is 1.0: 50.0 ~1.0: 200.0 It is preferable that the range is within the range.

[0036] Furthermore, the heat storage material composition may contain additives other than the solid-liquid phase change material, nucleation material, and nucleation assistant material. Examples of such additives include melting point adjusters and thickeners. The concentration of the additives is preferably in the range of 0.001% to 20,000% by weight, and more preferably in the range of 0.001% to 10,000% by weight, based on the total heat storage material composition.

[0037] Furthermore, there are no particular limitations on how the heat storage material composition can be used, but one example is a method in which the heat storage material composition is filled into a container and sealed, and used as a heat storage material. Because the heat storage material composition has high thermal conductivity, there are no particular limitations on the shape of the container, and the design can be changed appropriately to suit the application, for example, to a plate shape, a cylinder shape, etc.

[0038] Furthermore, there is no particular limitation on the use of the heat storage material composition, and it can be used, for example, as a heat storage material in air conditioning and heating equipment, factory exhaust heat recovery equipment, agricultural equipment such as vinyl greenhouses, electronic devices such as terminal devices and mobile terminal devices, and location identification devices used in automobiles, buses, etc. The heat storage material can be used by storing heat from the surrounding environment during the day and releasing it to the surrounding environment at night, thereby achieving effective use of thermal energy. In particular, the heat storage material composition according to the present invention is capable of storing and releasing heat even in high-temperature environments, and therefore, [Example]

[0039] Examples and comparative examples of the present invention will be specifically described below, but the application of the present invention is not limited to these examples.

[0040] Example 1 A heat storage material composition was manufactured by adjusting the solid-liquid phase change material (zinc nitrate hexahydrate) {Zn(NO3)2·6H2O} to 99.495 wt%, the nucleating material (barium hydroxide) {Ba(OH)2} to 0.005 wt%, and the nucleation assistant (fly ash) to 0.500 wt%. The freezing point (melting point) of the heat storage material composition was set to 35°C using zinc nitrate. This manufactured heat storage material composition was designated Example 1. The concentration of the nucleating material was kept low in order to confirm the effect of the nucleation assistant.

[0041] <Comparative Example 1> A heat storage material composition was produced in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 99.980 wt %, 0.010 wt % of strontium chloride dihydrate (SrCl2·2H2O) was added as a nucleating material together with 0.010 wt % of barium hydroxide, and no nucleation assistant was added. This produced heat storage material composition was designated Comparative Example 1.

[0042] <Example 2> A heat storage material composition was produced in the same manner as in Example 1, except that the fly ash used as the nucleation assistant in the heat storage material composition of Example 1 was changed to carbon black (furnace black). This produced heat storage material composition was designated Example 2.

[0043] Example 3 A heat storage material composition was produced in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 98.995% by weight, and 0.500% by weight of silica gel was added together with 0.500% by weight of fly ash as a nucleation assistant. This produced heat storage material composition was designated Example 3.

[0044] Example 4 A heat storage material composition was produced in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 99.480 wt %, and 0.010 wt % of strontium chloride dihydrate was added as a nucleating material together with 0.010 wt % of barium hydroxide. This produced heat storage material composition was designated Example 4.

[0045] <Example 5> A heat storage material composition was produced in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 99.485% by weight, 0.010% by weight of strontium chloride dihydrate was added together with 0.010% by weight of barium hydroxide as the nucleation material, and the fly ash as the nucleation assistant material was changed to carbon black (furnace black). This produced heat storage material composition was designated Example 5.

[0046] Example 6 A heat storage material composition was produced in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 98.985% by weight, 0.010% by weight of strontium chloride dihydrate was added together with 0.010% by weight of barium hydroxide as a nucleating material, and 0.500% by weight of silica gel was added together with 0.500% by weight of fly ash as a nucleating assistant. This produced heat storage material composition was designated Example 6.

[0047] <Evaluation method> For the heat storage material compositions of Examples 1-6 and Comparative Example 1, the ambient temperature of each heat storage material composition was lowered from approximately 80°C to approximately 30°C over a predetermined period of time (cooling), and then again raised from approximately 30°C to 80°C (heating), and this heat cycle was repeated a predetermined number of times to measure the temperature change of each heat storage material composition.

[0048] <Evaluation results> FIG. 1 shows the ingredient lists of the heat storage material compositions of Examples 1-3 and Comparative Example 1. FIG. 2 shows a graph of the temperature change of the heat storage material compositions of Examples 1-3 and Comparative Example 1 during the fifth heat cycle. As shown in FIG. 2, it can be seen that during cooling in the heat cycle, supercooling occurs in the heat storage material composition of Comparative Example 1, in which two types of nucleating agents, barium hydroxide and strontium chloride, are added, and no rising edge is observed in the graph. On the other hand, it can be seen that supercooling does not occur in the heat storage material composition of Example 1-2, in which one type of nucleating agent, a silicon-containing fine powder or a carbon-containing fine powder, is added to one type of nucleating agent, and a rising edge is observed in the graph corresponding to endotherm. Furthermore, it can be seen that the heat storage material composition of Example 3, in which two types of silicon-containing fine powder nucleating agents are added to one type of nucleating agent, shows a faster rising edge in the graph corresponding to endotherm.

[0049] Furthermore, it can be seen that during heating in the heat cycle, the heat storage material compositions of Examples 1-3 have a higher heating temperature per unit time, a faster heating rate, and a faster rise in the graph compared to the heat storage material composition of Comparative Example 1.

[0050] Figure 3 shows the ingredient tables for the heat storage material compositions of Examples 4-6 and Comparative Example 1. Figure 4 shows a graph of the temperature changes of the heat storage material compositions of Examples 4-6 and Comparative Example 1 during the fifth heat cycle. As shown in Figure 4, in the heat storage material composition of Example 4-5, in which one type of silicon-containing fine powder nucleation assistant is added to two types of nucleation materials, during cooling in the heat cycle, it can be seen that, as described above, supercooling does not occur and a rise in the graph corresponding to endotherm is observed. Furthermore, it can be seen that in the heat storage material composition of Example 6, in which two types of silicon-containing fine powder nucleation assistants are added to two types of nucleation materials, the rise in the graph corresponding to endotherm is earlier.

[0051] Furthermore, it can be seen that during heating in the heat cycle, the heat storage material compositions of Examples 4-6 have a higher heating temperature per unit time, a faster heating rate, and a faster rise in the graph compared to the heat storage material composition of Comparative Example 1.

[0052] Example 7 In the heat storage material composition of Example 1, the solid-liquid phase change material was 97.985% by weight, 0.010% by weight of strontium chloride dihydrate was added together with 0.005% by weight of barium hydroxide as nucleation materials, and 0.500% by weight of fly ash, 0.500% by weight of silica gel, and 1.000% by weight of carbon black were added as nucleation assistant materials. A heat storage material composition was produced in the same manner as in Example 1. This produced heat storage material composition is designated Example 7.

[0053] Example 8 A heat storage material composition was prepared in the same manner as in Example 1, except that the solid-liquid phase change material was 97.985 wt %, 0.010 wt % of strontium chloride dihydrate was added together with 0.005 wt % of barium hydroxide as a nucleating material, and 0.500 wt % of fly ash, 1.000 wt % of silica gel, and 0.5 wt % of carbon black were added as nucleation assistants. The heat storage material composition prepared was designated Example 8. FIG. 5 shows the ingredient list of the heat storage material composition of Examples 7-8. Examples 7-8 were evaluated using the same evaluation method as described above, with the cooling temperature set to approximately 15°C and the heating temperature set to approximately 80°C.

[0054] <Evaluation results> Figure 6 shows a graph of the temperature change of the heat storage material composition of Example 7-8 during the 15th to 17th heat cycles. Figure 6 also shows the ambient temperature. As shown in Figure 6, it can be seen that during the cooling phase of the heat cycle, the heat storage material composition of Example 7-8, to which three types of nucleation assistant materials were added, exhibited a rise in the graph corresponding to endothermic heat. It can also be seen that during the heating phase of the heat cycle, the heat storage material composition of Example 7-8 exhibited a higher heating temperature per unit time, a faster heating rate, and a faster rise in the graph.

[0055] Example 9 A heat storage material composition was prepared in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 98.995 wt %, 0.005 wt % of barium hydroxide was added as a nucleating material, strontium chloride dihydrate was not impregnated, and 0.500 wt % of silica gel and 0.500 wt % of carbon black were added as nucleation assistants instead of fly ash. This heat storage material composition was designated Example 9. Note that FIG. 7 shows the ingredient lists of the heat storage material compositions of Examples 1-2 and 9. Examples 1-2 and 9 were evaluated using the same evaluation method as described above, with the cooling temperature set to about 15°C and the heating temperature set to about 80°C.

[0056] <Evaluation results> Figure 8 shows a graph of the temperature changes of the heat storage material compositions of Examples 1-2 and 9 during the 35th heat cycle. The ambient temperature is also shown in Figure 8. As shown in Figure 8, even for the heat storage material composition of Example 9, to which one type of nucleation material and two types of nucleation assistant materials have been added, during cooling in the heat cycle, a rise in the graph corresponding to heat absorption is observed, similar to the heat storage material composition of Example 1-2, and it can be seen that the rise in the graph corresponding to heat release is faster.

[0057] Example 10 A heat storage material composition was prepared in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 99.485 wt %, 0.010 wt % of strontium chloride dihydrate was added as a nucleating material together with 0.005 wt % of barium hydroxide, and 0.500 wt % of carbon black was added as a nucleation assistant without adding fly ash or silica gel. A heat storage material composition was prepared in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 99.485 wt %, 0.010 wt % of strontium chloride dihydrate was added as a nucleating material, and 0.500 wt % of carbon black was added as a nucleation assistant without adding fly ash or silica gel. This heat storage material composition was designated Example 10. Note that FIG. 9 shows the ingredient list of the heat storage material compositions of Examples 5 and 10. Examples 5 and 10 were evaluated using the same evaluation method as described above, with the cooling temperature set to about 15°C and the heating temperature set to about 80°C.

[0058] <Evaluation results> Figure 10 shows a graph of the temperature changes of the heat storage material compositions of Examples 5 and 10 during the 25th heat cycle. The ambient temperature is also shown in Figure 10. As shown in Figure 10, even for the heat storage material composition of Example 10, to which two types of nucleation materials and one type of nucleation assistant material have been added, during cooling in the heat cycle, a rise in the graph corresponding to heat absorption is observed, similar to the heat storage material composition of Example 5, and it can be seen that the rise in the graph corresponding to heat release is faster.

[0059] Example 11 A heat storage material composition was prepared in the same manner as in Example 1, except that in the heat storage material composition of Example 1, the solid-liquid phase change material was 99.490 wt %, barium hydroxide was not added as a nucleating material, and strontium chloride dihydrate was added at 0.010 wt %, and fly ash and silica gel were not added as a nucleating aid, and carbon black was added at 0.500 wt %, and the heat storage material composition was prepared in the same manner as in Example 1. This heat storage material composition was designated Example 11. Note that FIG. 11 shows a table of ingredients for the heat storage material composition of Example 11. Example 11 was evaluated using the same evaluation method as described above, with the cooling temperature set to about 15°C and the heating temperature set to about 80°C.

[0060] <Evaluation results> Figure 12 shows a graph of the temperature change of the heat storage material composition of Example 11 during the sixth heat cycle. The ambient temperature is also shown in Figure 12. As shown in Figure 12, even for the heat storage material composition of Example 11 to which one type of nucleation material and one type of nucleation assistant material have been added, during cooling in the heat cycle, a rise in the graph corresponding to heat absorption is observed, as described above, and it can be seen that the rise in the graph corresponding to heat release is quicker.

[0061] This showed that by adding a nucleation assistant containing silicon-containing fine powder or carbon-containing fine powder to a solid-liquid phase change material containing zinc nitrate and a nucleation material, it becomes possible to store and release heat even in high-temperature environments, and to use the material repeatedly and stably. [Industrial Applicability]

[0062] As described above, the heat storage material composition according to the present invention is useful as a heat storage material in various fields, and is effective as a heat storage material composition that is capable of storing and releasing heat even in high-temperature environments and can be used repeatedly and stably.

Claims

1. a solid-liquid phase change material containing zinc nitrate; a nucleating material; a nucleation aid containing a silicon-containing fine powder or a carbon-containing fine powder; Contains the nucleating material comprises barium hydroxide or strontium chloride; The silicon-containing fine powder comprises fly ash or silica gel; The carbon-containing fine powder includes carbon black, The mixing ratio of the nucleation material to the nucleation assistant material is within the range of 1.0:50.0 to 1.0:200.0 by weight. Heat storage material composition.

2. The concentration of the nucleating material is in the range of 0.001% by weight to 0.100% by weight based on the total heat storage material composition; The concentration of the nucleation aid is in the range of 0.050% by weight to 5.000% by weight based on the total heat storage material composition. The heat storage material composition according to claim 1 .

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