Heat storage material, heat storage material composition, and heat storage molded body

Abstract

Provided are: a heat storage material which can exhibit excellent heat storage properties, dissipation resistance and hydrolysis resistance; a heat storage material composition which contains the heat storage material, exhibits excellent curing properties even if the heat storage material content is high and can yield a heat storage molded body which has a high latent heat amount per unit volume of a molded body and exhibits excellent heat storage properties; and a heat storage molded body in which the heat storage material is unlikely to dissipate or leak from the inner part of the molded body even if exposed to a high temperature environment and which exhibits excellent dissipation resistance and leak resistance. The present invention relates to a heat storage material characterized by containing a saturated fatty acid monoester (A) obtained by reacting: a saturated aliphatic monocarboxylic acid having a straight chain alkyl group with 8-20 carbon atoms; and a saturated aliphatic monoalcohol having a straight chain alkyl group with 8-20 carbon atoms.

Description

Technical Field

[0001] The present invention relates to a heat storage material, a heat storage material composition excellent in heat storage properties, etc., and a heat storage molded body obtained from the heat storage material composition.

Background Art

[0002] In recent years, heat storage technologies that effectively utilize natural energies such as solar heat and geothermal heat, and waste heat from air conditioners and the like, have been attracting attention as one of the technologies for solving energy problems.

[0003] As a heat storage material used in such a heat storage technology, particularly, an organic latent heat storage material that stores heat (heat storage) when a substance changes phase from a solid to a liquid and releases heat (heat release) when changing phase from a liquid to a solid has a high latent heat amount and is easy to handle, and thus research for practical application has been conducted.

[0004] Particularly, in recent years, various attempts have been made to further improve the heat storage performance.

[0005] As such an organic latent heat storage material, for example, Patent Document 1 discloses a heat storage body using an organic latent heat storage material such as methyl stearate or methyl palmitate, and Patent Document 2 discloses a heat storage microcapsule using a fatty acid ester having 23 or less carbon atoms in total and a fatty acid ester having 20 or more carbon atoms in total as an organic latent heat storage material.

[0006] However, in the case of the heat storage body using the organic latent heat storage material of Patent Document 1, when the blending ratio of the heat storage material is increased, while an improvement in heat storage performance is recognized, when exposed to a high-temperature environment, the heat dissipation resistance and leakage resistance tend to decrease, and it has been difficult to improve heat storage performance and heat dissipation resistance simultaneously.

[0007] Also, in the case of the heat storage microcapsule of Patent Document 2, although an improvement in heat dissipation resistance and leakage resistance is recognized by encapsulation, when the blending ratio of the heat storage material is increased, there is a possibility that a problem may occur in the curability during the production of a heat storage body or the like.

[0008] When fatty acid esters like those described above are used as organic latent heat storage materials, a difference arises between the temperature at which the phase change occurs from solid to liquid (melting point) and the temperature at which the phase change occurs from liquid to solid (freezing point). This results in a problem where the temperature range in which heat storage is observed differs depending on whether the temperature change is from low to high or from high to low.

[0009] In addition, while latent heat storage materials are expected to be used as building materials for houses and other structures, and as transport materials for food and pharmaceuticals, in actual use they may be exposed to high-temperature environments or come into contact with water. In such cases, problems such as a decrease in heat dissipation resistance and a decrease in heat storage performance due to hydrolysis may occur, so further performance improvements have been desired. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2011-208121 [Patent Document 2] Japanese Patent Publication No. 2018-76485 [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] Therefore, the problems that the present invention aims to solve are: a heat storage material that can approximate the melting point and solidification point, and contribute to exhibiting excellent heat storage, heat dissipation resistance, and hydrolysis resistance at a desired set temperature, regardless of whether the temperature change is from high to low or low to high; a heat storage material composition that contains the heat storage material and, even when the proportion of the heat storage material is high, yields a heat storage molded body that exhibits excellent curability, a high latent heat amount per unit volume of the molded body, and excellent heat storage properties; and a heat storage molded body that, even when exposed to a high-temperature environment, is less likely to dissipate or leak from the inside, and exhibits excellent heat dissipation resistance and leakage resistance. [Means for solving the problem]

[0012] In order to solve the above problems, the present invention was developed through diligent research and has found that by using a heat storage material (organic latent heat storage material) containing a saturated fatty acid monoester of a specific structure, a heat storage material can be obtained that contributes to the excellent heat storage, heat dissipation resistance, and hydrolysis resistance; a heat storage material composition that contains the said heat storage material and, even when the proportion of the heat storage material is high, yields a heat storage molded body that exhibits excellent curability, a high latent heat amount per unit volume of the molded body, and excellent heat storage properties; and a heat storage molded body that, even when exposed to a high-temperature environment, does not easily dissipate or leak from the inside, and has excellent heat dissipation resistance and leakage resistance.

[0013] In other words, the present invention relates to a heat storage material characterized by containing a saturated fatty acid monoester (A) obtained by reacting a saturated aliphatic monocarboxylic acid having a linear alkyl group having 8 to 20 carbon atoms, and a saturated aliphatic monoalcohol having a linear alkyl group having 8 to 20 carbon atoms.

[0014] The heat storage material of the present invention is obtained by reacting a saturated aliphatic monocarboxylic acid (ac) having a linear alkyl group with 8 to 20 carbon atoms (Nc) and a saturated aliphatic monoalcohol (aa) having a linear alkyl group with 8 to 20 carbon atoms (Na). It is preferable that the product contains a saturated fatty acid monoester (A-1) that satisfies the following formula (1). (1)(Nc)<(Na)

[0015] In the heat storage material of the present invention, it is preferable that the saturated fatty acid monoester (A-1) satisfies the following formula (2). (2) 22 ≤ (Nc + Na) ≤ 32

[0016] In the heat storage material of the present invention, it is preferable that the saturated fatty acid monoester (A-1) satisfies the following formula (3). (3) 4 ≤ (Na-Nc) ≤ 8

[0017] The present invention relates to a heat storage material composition characterized by containing the heat storage material, polyol (B), and isocyanate (C).

[0018] In the heat storage material composition of the present invention, it is preferable that the polyol (B) contains a polyester polyol (B-1) and a polyether polyol (B-2).

[0019] In the heat storage material composition of the present invention, it is preferable that the content ratio of the heat storage material in the total amount of the heat storage material composition is 50% by mass or more and 95% by mass or less.

[0020] In the heat storage material composition of the present invention, it is preferable that the component (B-1) contains a polyester polyol having a number average molecular weight of 1000 or more and 4000 or less and a functional group number of 2 or more and less than 3.

[0021] In the heat storage material composition of the present invention, it is preferable that the component (B-2) contains a polyether polyol having a number average molecular weight of 1000 or more and 12000 or less and a functional group number of 2 or more and 3 or less.

[0022] In the heat storage material composition of the present invention, it is preferable that the component (C) contains a trimer of isocyanate.

[0023] In the heat storage material composition of the present invention, it is preferable that the mixing ratio of the total amount of the component (B-1) and the component (B-2) and the component (C) is 0.75 or more and 2.2 or less in terms of the NCO / OH ratio.

[0024] The present invention relates to a heat storage molded body characterized by being formed from the heat storage material composition.

Effects of the Invention

[0025] The heat storage material of the present invention is useful because it has excellent heat storage properties, particularly its ability to approximate the melting point and solidification point, and can contribute to the excellent heat storage, heat dissipation resistance, and hydrolysis resistance at a desired set temperature, regardless of whether the temperature change is from high to low or low to high. In particular, when using a heat storage material composition containing the heat storage material, the resulting heat storage molded article exhibits excellent curability, a high latent heat content per unit volume of the molded article, and excellent heat storage properties, even when the heat storage material content is high. Furthermore, even when the heat storage molded article is exposed to a high-temperature environment, the heat storage material is less likely to dissipate or leak from the inside, exhibiting excellent heat dissipation resistance and leakage resistance, making it extremely useful. [Modes for carrying out the invention]

[0026] The embodiments for carrying out the present invention will be described in detail below.

[0027] (Heat storage material) (A) component The present invention relates to a heat storage material characterized by comprising a saturated fatty acid monoester (A) (component (A)) obtained by reacting a saturated aliphatic monocarboxylic acid having a linear alkyl group having 8 to 20 carbon atoms, and a saturated aliphatic monoalcohol having a linear alkyl group having 8 to 20 carbon atoms. Component (A) functions as a heat storage material, possesses excellent heat storage properties, is less prone to heat loss even when exposed to high-temperature environments, exhibits excellent heat loss resistance and hydrolysis resistance, and can exhibit excellent heat storage properties at a desired set temperature regardless of whether the temperature change is from high to low or low to high. Furthermore, the heat storage molded body formed from the heat storage material composition is less prone to leakage and exhibits excellent leakage resistance.

[0028] (A-1) component The aforementioned component (A) preferably contains a saturated fatty acid monoester (A-1) (component (A-1)) obtained by reacting a saturated aliphatic monocarboxylic acid (ac) having a linear alkyl group with 8 to 20 carbon atoms (Nc) and a saturated aliphatic monoalcohol (aa) having a linear alkyl group with 8 to 20 carbon atoms (Na), satisfying the following formula (1). The aforementioned component (A-1) is preferable because, by satisfying the following formula (1), it has excellent heat storage capacity, resistance to heat dissipation, and even better resistance to hydrolysis, and can exhibit even better heat storage capacity at a desired set temperature regardless of whether the temperature change is from high to low temperature or from low to high temperature. Furthermore, the aforementioned component (A-1) is less likely to leak from the heat storage molded article formed from the heat storage material composition, and it also has excellent leak resistance. (1)(Nc)<(Na)

[0029] The heat storage material of the present invention contains a component (ac) having a specific structure and a component (A-1) having a specific range of carbon atoms obtained by reacting a component (aa) having a specific structure. By approximating the melting point and freezing point of the (A-1) component, it is possible to exhibit excellent heat storage performance at a desired set temperature regardless of whether the temperature change is from high to low or low to high, making it useful. Furthermore, the (A-1) component can be adjusted to a desired temperature by combining the (ac) component and the (aa) component having a specific structure. For example, it is useful for exhibiting excellent heat storage performance at a pinpoint desired temperature. Moreover, the (A-1) component is less likely to dissipate even when exposed to a high-temperature environment and has excellent dissipation resistance, and also has excellent hydrolysis resistance even in the presence of water. The "desired temperature" is not particularly limited and is adjustable, but for example, it can be set to a temperature range of 10°C to 40°C, or to a temperature range including lower temperatures below freezing point.

[0030] The difference between the melting point and the freezing point of component (A-1) is preferably less than 2.5°C, more preferably less than 2.0°C, and even more preferably less than 1.0°C. Having a difference of less than 2.5°C is preferable because it provides excellent heat storage at the desired set temperature, regardless of whether the temperature change is from high to low or low to high.

[0031] It is preferable that the (A-1) component satisfies formula (1) above and also satisfies formula (2) below. When the (A-1) component satisfies formula (2) below, the total number of carbon atoms (Nc + Na) is within the above range, it exhibits superior heat storage and heat dissipation resistance, and furthermore, it exhibits superior hydrolysis resistance, and exhibits superior heat storage at the desired set temperature regardless of the temperature change from high to low temperature or low to high temperature, and also has excellent compatibility with the (B-1) and (B-2) components described later, has excellent formability and curability when forming a heat storage molded body, is easily supported and retained inside the heat storage molded body, and is preferable because it has superior heat dissipation resistance, leakage resistance and heat storage material migration prevention. (2) 22 ≤ (Nc + Na) ≤ 32

[0032] Furthermore, the melting point, freezing point, phase change temperature, and latent heat of saturated fatty acid monoesters such as component (A-1) can be measured using a differential scanning calorimeter (DSC7000X manufactured by Hitachi High-Tech Science Corporation). The measurement conditions were as follows: melting point (°C), freezing point (°C), latent heat of solidification (J / g), and latent heat of fusion (J / g) were measured in the temperature range of -40°C to 60°C at a heating / cooling rate of 10°C / min. The phase change temperature was the average value of the freezing point (°C) and melting point (°C), and the latent heat was the average value of the latent heat of solidification (J / g) and latent heat of fusion (J / g).

[0033] It is preferable that the (A-1) component satisfies formula (1) above and also satisfies formula (3) below. By satisfying formula (3) below, the (A-1) component can more closely approximate the melting point and the freezing point, thereby exhibiting better heat storage at a desired set temperature and improving hydrolysis resistance, making it useful. (3) 4 ≤ (Na-Nc) ≤ 8

[0034] Furthermore, it is preferable that the (A-1) component has a carbon number (Nc) of 8 or more and 16 or less, and a carbon number (Na) of 12 or more and 20 or less, and it is more preferable that it satisfies formula (2') and / or formula (3) below in addition to formula (1), and it is even more preferable that it satisfies formulas (1), (2'), and (3) simultaneously. By satisfying the conditions of the following formulas, better heat storage performance can be achieved at the desired set temperature. In particular, by satisfying formula (2') below, better resistance to heat dissipation, leakage, and heat storage material migration can be achieved, and by satisfying formula (3) below, the melting point and solidification point can be made more approximate, and hydrolysis resistance can be improved, which is useful. (1)(Nc)<(Na) (2')24≦(Nc+Na)≦30 (3) 4 ≤ (Na-Nc) ≤ 8

[0035] The content of component (A-1) is preferably more than 10% by mass, more preferably more than 30% by mass, even more preferably more than 50% by mass, and particularly preferably more than 70% by mass, based on 100% by mass of the total amount of the heat storage material. The upper limit is preferably 100% by mass. When component (A-1) in the heat storage material exceeds 10% by mass, the difference between the melting point and the freezing point of the heat storage material or heat storage material composition containing component (A-1) is kept small, resulting in excellent heat storage performance, which is preferable.

[0036] (A-2) component In the heat storage material of the present invention, the saturated fatty acid monoester (A) preferably contains a saturated fatty acid monoester (A-2) (component (A-2)) obtained by reacting a saturated aliphatic monocarboxylic acid (ac) having a linear alkyl group with 8 to 20 carbon atoms (Nc) and a saturated aliphatic monoalcohol (aa) having a linear alkyl group with 8 to 20 carbon atoms (Na), satisfying the following formula (4). The (A-2) component is preferable because it satisfies the following formula (4) and exhibits excellent heat storage and heat dissipation resistance. Furthermore, the above effects can be exhibited even more favorably if the (A-2) component also satisfies the following formula (4'). (4)(Nc)≧(Na) (4')(Nc)>(Na)

[0037] It is preferable that the (A-2) component satisfies formula (4) above and also satisfies formula (2) below. The (A-2) component is preferable because it satisfies formula (2) below, resulting in superior heat storage and heat dissipation resistance. (2) 22 ≤ (Nc + Na) ≤ 32

[0038] The heat storage material composition of the present invention can be used with only one type of component (A) as the heat storage material, or with a mixture of two or more types. When two or more types of component (A) are used in mixture form, it is possible to easily adjust the temperature in a temperature range that was difficult to achieve with only one type of component (A), making it useful.

[0039] Furthermore, in the present invention, it is preferable to use two or more types of the (A-1) component in combination with only one type of the (A-1) component, or to use the (A-2) component mixed with the (A-1) component. This makes it easier to set the desired temperature, allows adjustment of the difference between the melting point and the freezing point, and enables excellent heat storage at the desired set temperature.

[0040] Furthermore, when using a mixture of component (A-1) and component (A-2), if the mixing ratio (molar ratio) of component (A-1) and component (A-2) is in the relationship [(A-1):(A-2)]=[p:q], it is preferable that the following equations (1) and (5) are simultaneously satisfied. By satisfying the following equation (5), it becomes possible to approximate the melting point and freezing point when the temperature is adjusted to the desired temperature setting, resulting in excellent hydrolysis resistance and usefulness. (1)(Nc)<(Na) (5) {(Nc) of component (A-1) × [p / (p+q)] + (Nc) of component (A-2) × [q / (p+q)]} < {(Na) of component (A-1) × [p / (p+q)] + (Na) of component (A-2) × [q / (p+q)]}

[0041] In addition to formula (4), component (A-2) preferably satisfies at least one, and more than two, selected from the following formula (2'). By satisfying these formulas, it becomes easier to set the desired temperature, the difference between the melting point and the freezing point of the heat storage material composition can be suppressed, and excellent heat storage performance can be exhibited at the desired set temperature. (2')24≦(Nc+Na)≦30

[0042] (ac) component The (ac) component is a saturated aliphatic monocarboxylic acid having a linear alkyl group with 8 to 20 carbon atoms (Nc), preferably a saturated aliphatic monocarboxylic acid having a linear alkyl group with 8 to 16 carbon atoms (Nc), and more preferably a saturated aliphatic monocarboxylic acid having a linear alkyl group with 10 to 14 carbon atoms (Nc).

[0043] Examples of the (ac) component include n-octanoic acid, n-nonanoic acid, n-decanoic acid, n-undecanoic acid, n-dodecanoic acid, n-tridecanoic acid, n-tetradecanoic acid, n-pentadecanoic acid, n-hexadecanoic acid, n-heptadecanoic acid, n-octadecanoic acid, n-nonadecanoic acid, n-eicosanic acid, etc., and one or more of these can be used.

[0044] (aa) component The (aa) component is a saturated aliphatic monoalcohol having a linear alkyl group with 8 to 20 carbon atoms (Na), preferably a saturated aliphatic monoalcohol having a linear alkyl group with 10 to 20 carbon atoms (Na), and more preferably a saturated aliphatic monoalcohol having a linear alkyl group with 10 to 18 carbon atoms (Na). Examples of the (aa) component include 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 1-nonadecanol, 1-icosanol, and one or more of these can be used.

[0045] The sum of the number of carbon atoms (Nc) in the linear alkyl group of component (ac) and the number of carbon atoms (Na) in the linear alkyl group of component (aa) is preferably 20 or more and 32 or less, more preferably 22 or more and 32 or less, and even more preferably 24 or more and 32 or less. When the sum of the number of carbon atoms (Nc + Na) is within the above range, it exhibits excellent heat storage and heat dissipation resistance, as well as excellent compatibility with components (B-1) and (B-2) described later, resulting in excellent formability and curability when forming a heat-storing molded body, making it easier to support and retain within the molded body, and resulting in superior heat dissipation resistance and leakage resistance, which is preferable.

[0046] Examples of the above (A-1) component include nonyl octanoate, decyl octanoate, undecyl octanoate, dodecyl octanoate, tridecyl octanoate, tetradecyl octanoate, pentadecyl octanoate, hexadecyl octanoate, heptadecyl octanoate, octadecyl octanoate, nonadecyl octanoate, eicosyl octanoate, Decyl nonanoate, undecyl nonanoate, dodecyl nonanoate, tridecyl nonanoate, tetradecyl nonanoate, pentadecyl nonanoate, hexadecyl nonanoate, heptadecyl nonanoate, octadecyl nonanoate, nonadecyl nonanoate, eicosyl nonanoate, Undecyl decanoate, dodecyl decanoate, tridecyl decanoate, tetradecyl decanoate, pentadecyl decanoate, hexadecyl decanoate, heptadecyl decanoate, octadecyl decanoate, nonadecyl decanoate, ecosyl decanoate, Dodecyl undecanoate, tridecyl undecanoate, tetradecyl undecanoate, pentadecyl undecanoate, hexadecyl undecanoate, heptadecyl undecanoate, octadecyl undecanoate, nonadecyl undecanoate, eicosyl undecanoate, Tridecyl dodecanoate, tetradecyl dodecanoate, pentadecyl dodecanoate, hexadecyl dodecanoate, heptadecyl dodecanoate, octadecyl dodecanoate, nonadecyl dodecanoate, eicosyl dodecanoate, Tetradecyl tridecanoate, pentadecyl tridecanoate, hexadecyl tridecanoate, heptadecyl tridecanoate, octadecyl tridecanoate, nonadecyl tridecanoate, eicosyl tridecanoate, Pentadecyl tetradecanoate, hexadecyl tetradecanoate, heptadecyl tetradecanoate, octadecyl tetradecanoate, nonadecyl tetradecanoate, eicosyl tetradecanoate, Hexadecyl pentadecanoate, heptadecyl pentadecanoate, octadecyl pentadecanoate, nonadecyl pentadecanoate, eicosyl pentadecanoate, Heptadecyl hexadecanate, octadecyl hexadecanate, nonadecyl hexadecanate, eicosyl hexadecanate, Octadecyl heptadecanate, nonadecyl heptadecanate, eicosyl heptadecanate, Nonadecyl octadecanoate, eicosyl octadecanoate, nonadecanate eicosyl, Examples include the following, and one or more of these can be used.

[0047] For example, the aforementioned (A-2) component is: Octyl octanoate, Octyl nonanoate, nonyl nonanoate, Octyl decanoate, nonyl decanoate, decyl decanoate, Octyl undecanoate, nonyl undecanoate, decyl undecanoate, undecyl undecanoate, Octyl dodecanoate, nonyl dodecanoate, decyl dodecanoate, undecyl dodecanoate, dodecyl dodecanoate, Octyl tridecanoate, nonyl tridecanoate, decyl tridecanoate, undecyl tridecanoate, dodecyl tridecanoate, tridecyl tridecanoate, Octyl tetradecanoate, nonyl tetradecanoate, decyl tetradecanoate, undecyl tetradecanoate, dodecyl tetradecanoate, tridecyl tetradecanoate, tetradecyl tetradecanoate, Octyl pentadecanoate, nonyl pentadecanoate, decyl pentadecanoate, undecyl pentadecanoate, dodecyl pentadecanoate, tridecyl pentadecanoate, tetradecyl pentadecanoate, pentadecyl pentadecanoate, Octyl hexadecanate, nonyl hexadecanate, decyl hexadecanate, undecyl hexadecanate, dodecyl hexadecanate, tridecyl hexadecanate, tetradecyl hexadecanate, pentadecyl hexadecanate, hexadecyl hexadecanate, Octyl heptadecanate, nonyl heptadecanate, decyl heptadecanate, undecyl heptadecanate, dodecyl heptadecanate, tridecyl heptadecanate, tetradecyl heptadecanate, pentadecyl heptadecanate, hexadecyl heptadecanate, heptadecanate Octyl octadecanoate, nonyl octadecanoate, decyl octadecanoate, undecyl octadecanoate, dodecyl octadecanoate, tridecyl octadecanoate, tetradecyl octadecanoate, pentadecyl octadecanoate, hexadecyl octadecanoate, heptadecyl octadecanoate, octadecyl octadecanoate, Octyl nonadecanate, nonyl nonadecanate, decyl nonadecanate, undecyl nonadecanate, dodecyl nonadecanate, tridecyl nonadecanate, tetradecyl nonadecanate, pentadecyl nonadecanate, hexadecyl nonadecanate, heptadecyl nonadecanate, octadecyl nonadecanate, nonadecyl nonadecanate, Octyl eicosanoate, nonyl eicosanoate, decyl eicosanoate, undecyl eicosanoate, dodecyl eicosanoate, tridecyl eicosanoate, tetradecyl eicosanoate, pentadecyl eicosanoate, hexadecyl eicosanoate, heptadecyl eicosanoate, octadecyl eicosanoate, nonadecyl eicosanoate, eicosyl eicosanoate, Examples include the following, and one or more of these can be used.

[0048] The aforementioned component (A) can be produced by conventional esterification and transesterification reactions. After esterification, if necessary, known purification methods such as vacuum distillation, water washing after alkali neutralization, adsorption treatment using activated clay and synthetic adsorbents, and steaming can be used to remove unreacted saturated aliphatic monocarboxylic acids and saturated aliphatic monoalcohols.

[0049] From the viewpoint of heat storage capacity, the latent heat content of component (A) (in its pure form) is preferably 120 J / g or more as a lower limit, more preferably 150 J / g or more, and preferably 260 J / g or less as an upper limit, more preferably 250 J / g or less.

[0050] The acid value of component (A) (single component) is preferably 1 mg KOH / g or less, more preferably 0.5 mg KOH / g or less, and even more preferably 0.1 mg KOH / g or less, from the viewpoint of hydrolysis resistance.

[0051] The hydroxyl value of component (A) (single element) is preferably 2 mg KOH / g or less, more preferably 1 mg KOH / g or less, and even more preferably 0.5 mg KOH / g or less, from the viewpoint of heat storage capacity at the desired set temperature.

[0052] In this invention, other heat storage materials may be mixed with component (A) as long as they do not impair the properties of the present invention.

[0053] Other heat storage materials include fatty acid esters, fatty acids, aliphatic hydrocarbons, aliphatic alcohols, and the like, in addition to component (A) above.

[0054] Examples of fatty acid esters other than component (A) include fatty acid esters comprising component (ac) and alcohols other than component (aa), fatty acid esters comprising carboxylic acids other than component (ac) and component (aa), and fatty acid esters comprising carboxylic acids other than component (ac) and alcohols other than component (aa).

[0055] Examples of carboxylic acids other than the (ac) component include monocarboxylic acids having a linear alkyl group with 1 to 7 carbon atoms, monocarboxylic acids having a linear alkyl group with 21 to 30 carbon atoms, monocarboxylic acids having a branched alkyl group with 3 to 30 carbon atoms, polycarboxylic acids having an alkyl group with 2 to 30 carbon atoms, and unsaturated carboxylic acids having an alkyl group with 4 to 30 carbon atoms.

[0056] Examples of alcohols other than component (aa) include monoalcohols having a linear alkyl group with 1 to 7 carbon atoms, monoalcohols having a linear alkyl group with 21 to 30 carbon atoms, monoalcohols having a branched alkyl group with 3 to 30 carbon atoms, polyhydric alcohols having an alkyl group with 2 to 30 carbon atoms, and unsaturated alcohols having an alkyl group with 4 to 30 carbon atoms.

[0057] Furthermore, the content ratio of component (A) is preferably 50% by mass or more and 90% by mass or less, more preferably 60% by mass or more and 85% by mass or less, even more preferably 70% by mass or more and 80% by mass or less, and particularly preferably 70% by mass or more and 78% by mass or less, based on the total amount of the heat storage material composition. When the content ratio of component (A) is within the above range, even when using a heat storage material composition containing a very large amount of component (A), the support and retention of component (A) is excellent, and when forming a heat storage molded body, the formability, curability, and leakage of component (A) are prevented (leakage resistance) are excellent, and the resulting heat storage molded body can have excellent heat storage properties and be useful.

[0058] (Heat storage material composition) The present invention relates to a heat storage material composition characterized by containing a heat storage material containing component (A), a polyol (B), and an isocyanate (C). The heat storage material composition forms a three-dimensional network structure by the reaction of the polyol (B) and the isocyanate (C), and a heat storage molded body can be formed with the heat storage material containing component (A) embedded in the network structure. Even when the heat storage material containing component (A) is supported and held and exposed to a high-temperature environment, the heat storage material containing component (A) is less likely to be released or leaked, and the composition has excellent resistance to dissipation and leakage, which is preferable.

[0059] (B) Component Examples of the polyol (B) include polyester polyols, polyether polyols, acrylic polyols, polycarbonate polyols, polyolefin polyols, polycaprolactone polyols, polytetramethylene glycol polyols, polybutadiene polyols, polyoxypropylene polyols, polyoxypropylene ethylene polyols, epoxy polyols, alkyd polyols, fluorine-containing polyols, silicon-containing polyols, cellulose and / or its derivatives, polysaccharides such as amylose, and one or more of these can be used.

[0060] In the present invention, it is particularly preferable that the polyol (B) contains polyester polyol (B-1) and / or polyether polyol (B-2). Such polyol (B) is preferable because it has excellent curability and makes it easier to uniformly support and hold the heat storage material within the three-dimensional network structure.

[0061] (B-1) Component Preferably, the polyol (B) contains polyester polyol (B-1) (component (B-1)). Component (B-1) reacts with isocyanate (C), described later, to form a three-dimensional network structure. In particular, including component (B-1) provides excellent support and retention of the heat storage material containing component (A), and improves the heat dissipation resistance and leakage resistance based on the heat storage material containing component (A).

[0062] Examples of the (B-1) component include condensation polymers of polyhydric alcohols and polyhydric carboxylic acids; condensation polymers of polyhydric alcohols and hydroxycarboxylic acids; ring-opening polymers of cyclic esters (lactones); reaction products of three or more components from polyhydric alcohols, polyhydric carboxylic acids, hydroxycarboxylic acids, and cyclic esters; castor oil or modified products thereof.

[0063] Examples of the polyhydric alcohols include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 1,3-tetramethylenediol, 1,4-tetramethylenediol, 1,2-hexanediol, 1,4-hexanediol, 1,5 -Hexanediol, 1,6-Hexanediol, 1,3-Tetramethylenediol, 1,4-Dimethylolhexane, 2-Methyl-1,3-Trimethylenediol, 1,5-Pentamethylenediol, Trimethylpentanediol, 2,2,4-Trimethyl-1,3-Pentanediol, Neopentyl glycol, Cyclohexanediol, 2-Methyl-1,3-Propanediol, 2,2-Dimethyl-1,3-Propanediol, 2,2-Diethyl-1,3-Propanediol, 2-Methyl-2-Propropyl-1,3-Pro Panediol, 2-butyl-2-ethyl-1,3-propanediol, 2-methyl-1,4-butanediol, 1,6-hexamethylenediol, 3-methyl-1,5-pentamethylenediol, 2,4-diethyl-1,5-pentamethylenediol, 2-ethyl-1,3-hexanediol, 1,2-octanediol, 1,8-octanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, 1,2-decanediol, 1,10-decanediol, 1,11-undecanediol, 1,2-dodeca Diol, 1,12-dodecanediol, 1,13-tridecanediol, 1,14-tetradecanediol, 1,16-hexadecanediol, 1,18-octadecanediol, 1,12-octadecanediol, 1,20-eicosanediol, metaxylene glycol, paraxylene glycol, bishydroxyethoxybenzene, bishydroxyethyl terephthalate, glycerin, diglycerin, trimethylolpropane, ditrimethylolpropane, trimethylolethane, cyclohexanediols (1,Examples include 4-cyclohexanediol, cyclohexanedimethanol, etc., bisphenols (bisphenol A, etc.), sugar alcohols (xylitol, sorbitol, etc.), pentaerythritol, dipentaerythritol, 2-methylolpropanediol, ethoxylated trimethylolpropane, etc., or polycondensates thereof, and one or more of these can be used.

[0064] Examples of the polycarboxylic acids include aliphatic dicarboxylic acids such as malonic acid, maleic acid, maleic anhydride, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanediic acid, tridecanediic acid, tetradecanediic acid, pentadecanediic acid, hexadecanedioic acid, octadecanediic acid, and nonadecanedioic acid; alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid; and aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, orthophthalic acid, phthalic anhydride, terephthalic acid, 2,6-naphthalenedicarboxylic acid, paraphenylenedicarboxylic acid, and trimellitic acid. Palmitoleic acid, oleic acid, linoleic acid, linolenic acid, eicosenoic acid, coconut oil fatty acid, palm oil fatty acid, soybean oil fatty acid, hydrogenated soybean oil fatty acid, flaxseed oil fatty acid, safflower oil fatty acid, tung oil fatty acid, tall oil fatty acid, dehydrated castor oil fatty acid, castor oil fatty acid, grape seed oil fatty acid, black cumin oil fatty acid, pumpkin kernel oil fatty acid, borage seed oil fatty acid, wheat germ oil fatty acid, rice bran oil fatty acid, peanut oil fatty acid, rapeseed oil fatty acid, sunflower oil fatty acid, corn Examples include 2-60 mers of unsaturated fatty acids such as koshi oil fatty acid, cottonseed oil fatty acid, peanut oil fatty acid, apricot kernel oil fatty acid, pistachio oil fatty acid, almond oil fatty acid, olive oil fatty acid, macadamia nut oil fatty acid, avocado oil fatty acid, sea buckthorn oil fatty acid, sesame oil fatty acid, hemp oil fatty acid, hazelnut oil fatty acid, primrose oil fatty acid, wild rose oil fatty acid, safflower oil fatty acid, and walnut oil fatty acid, and one or more of these can be used.

[0065] Examples of the hydroxycarboxylic acids include 2-hydroxybutanoic acid, 2-hydroxypentanoic acid, 3-hydroxypentanoic acid, 3-hydroxyhexanoic acid, 2-hydroxyheptanoic acid, 3-hydroxyheptanoic acid, 2-hydroxyoctanoic acid, 3-hydroxyoctanoic acid, 4-hydroxynonanoic acid, 3-hydroxydecanoic acid, 3-hydroxydodecanoic acid, 5-hydroxydodecanoic acid, 3-hydroxytridecanoic acid, 6-hydroxytetradecanoic acid, 2-hydroxypentadecanoic acid, 10-hydroxyhexadecanoic acid, 11-hydroxyheptadecanoic acid, 10-hydroxyoctadecanoic acid, 12-hydroxyoctadecanoic acid, 10-hydroxynonadecanoic acid, 2-hydroxyicosanoic acid, 2 Examples include hydroxytetradocosanoic acid, ricinoleic acid, ricineradicic acid, cereronic acid, leucic acid, salicylic acid, glyceric acid, 3-hydroxypropionic acid, 5-hydroxypentanoic acid, 6-hydroxyhexanoic acid, 7-hydroxyheptanoic acid, 8-hydroxyoctanoic acid, 9-hydroxynonanoic acid, 10-hydroxydecanoic acid, 11-hydroxyundecanoic acid, 12-hydroxydodecanoic acid, 15-hydroxypentadecanoic acid, 16-hydroxyhexadecanoic acid, 19-hydroxynonadecanoic acid, 22-hydroxydocosanoic acid, mevalonic acid, pantoic acid, castor oil fatty acids, dehydrated castor oil fatty acids, etc., or polycondensates thereof, and one or more of these can be used.

[0066] In the ring-opening polymer of the aforementioned cyclic ester, examples of cyclic esters include propiolactone, β-methyl-δ-valerolactone, and ε-caprolactone.

[0067] The method for producing the polyester polyol can be carried out by conventional methods, and known curing agents, curing catalysts, etc., may be used as necessary. In the present invention, it is preferable that the polyester polyol contains one or more selected from polyhydric alcohols, polyhydric carboxylic acids, and hydroxycarboxylic acids having alkyl segments with 14 to 22 carbon atoms, and moreover, 16 to 20 carbon atoms. Furthermore, it is preferable to use a divalent or trivalent alcohol as the polyhydric alcohol. Similarly, it is preferable to use a divalent or trivalent carboxylic acid as the polyhydric carboxylic acid.

[0068] The number-average molecular weight (Mn) of component (B-1) is preferably 1000 to 4000, more preferably 1500 to 3500, and even more preferably 1800 to 3500. Having the number-average molecular weight of component (B-1) within this range is preferable because it provides excellent curability and facilitates the uniform loading and retention of the heat storage material containing component (A) within the three-dimensional network structure.

[0069] The number of functional groups in component (B-1) is preferably 2 or more and less than 3, and more preferably 2 or more and 2.5 or less. Having the number of functional groups in component (B-1) within this range is preferable because it results in excellent curability and facilitates the uniform support and retention of the heat storage material containing component (A) within the three-dimensional network structure. Note that the number of functional groups in component (B-1) refers to the average number of hydroxyl groups per molecule.

[0070] (B-2) Component Preferably, the polyol (B) contains polyether polyol (B-2) (component (B-2)). Component (B-2) reacts with isocyanate (C), described later, to form a three-dimensional network structure. In particular, component (B-2) has excellent curability, forming a stronger three-dimensional network structure, and makes it easier to uniformly support and hold the heat storage material containing component (A) within the three-dimensional network structure, allowing for uniform support and holding even at high concentrations of the heat storage material containing component (A).

[0071] The (B-2) component includes, for example, polyalkylene glycols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyethylene glycol monoalkyl ether, and polypropylene glycol monoalkyl ether, as well as (alkylene oxide-other alkylene oxide) copolymers containing multiple alkylene oxides as monomer components such as ethylene oxide-propylene oxide copolymer, bisphenol A type polyether polyols obtained by adding alkylene oxides (for example, at least one of ethylene oxide, propylene oxide, etc.; the same applies hereinafter) using bisphenol A as an initiator, and aromatic amines. Examples include aromatic amine polyether polyols obtained by adding alkylene oxide as an initiator (for example, toluenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, p-phenylenediamine, o-phenylenediamine, naphthalenediamine, triethanolamine, Mannich condensate, etc.), polyether polyols obtained by adding alkylene oxide as an initiator (for example, glycerin), and amino group-containing polyether polyols obtained by adding alkylene oxide as an initiator (for example, ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, neopentyldiamine, etc.).

[0072] The number-average molecular weight (Mn) of component (B-2) is preferably between 1,000 and 12,000, more preferably between 1,000 and 10,000, even more preferably between 2,000 and 8,000, and particularly preferably between 3,000 and 7,000. Having the number-average molecular weight of component (B-2) within this range is preferable because it results in superior curability.

[0073] The number of functional groups in component (B-2) is preferably 2 or more and 3 or less, more preferably 2 or more and less than 3, and even more preferably 2 or more and 2.5 or less. When the number of functional groups in component (B-2) is within the above range, the curability is better and therefore preferable. The number of functional groups in component (B-2) refers to the average number of hydroxyl groups per molecule.

[0074] The content ratio (mass ratio) of component (B-1) to component (B-2) is preferably 50:50 to 100:0, more preferably 50:50 to 99:1, even more preferably 55:45 to 95:5, and particularly preferably 60:40 to 85:15. Having the content ratio of component (B-1) to component (B-2) within the above range is preferable because it results in better formability and curability.

[0075] In the present invention, polyols other than the aforementioned (B-1) and (B-2) components can be used, as long as they do not impair the properties of the present invention. Examples of polyols other than the components (B-1) and (B-2) mentioned above include acrylic polyols, polycarbonate polyols, polyolefin polyols, polycaprolactone polyols, polytetramethylene glycol polyols, polybutadiene polyols, polyoxypropylene polyols, polyoxypropylene ethylene polyols, epoxy polyols, alkyd polyols, fluorine-containing polyols, silicon-containing polyols, cellulose and / or its derivatives, and polysaccharides such as amylose.

[0076] The polyolefin polyol can be a polyol having an olefin as a component of the polymer or copolymer backbone (or main chain), and having at least two hydroxyl groups in the molecule (especially at the terminals), with a number-average molecular weight (Mn) of 1500 or more. The olefin may be an olefin having a carbon-carbon double bond at the terminal (e.g., α-olefins such as ethylene and propylene), or an olefin having a carbon-carbon double bond at a site other than the terminal (e.g., isobutene), or even a diene (e.g., butadiene, isoprene).

[0077] (C) Component The heat storage material composition of the present invention preferably contains the isocyanate (C) (component (C)). Since component (C), together with component (B) described above, forms a three-dimensional network structure, a heat storage molded body can be formed in which the heat storage material containing component (A) is embedded in the network structure. Even when the heat storage material containing component (A) is supported and held and exposed to a high-temperature environment, the heat storage material containing component (A) is less likely to be released or leaked, resulting in excellent resistance to dissipation and leakage, making it useful.

[0078] The aforementioned (C) component is an isocyanate and is not limited to any isocyanate having an isocyanate group, but preferably has 2 or more isocyanate groups in one molecule, more preferably 2.2 or more. Examples of the aforementioned isocyanate include 1,3-trimethylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,3-pentamethylene diisocyanate, 1,5-pentamethylene diisocyanate, 1,6-hexamethylene diisocyanate (HMDI), 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, Aliphatic diisocyanates such as 2-methyl-1,5-pentamethylene diisocyanate, 3-methyl-1,5-pentamethylene diisocyanate, 2,4,4-trimethyl-1,6-hexamethylene diisocyanate, 2,2,4-trimethyl-1,6-hexamethylene diisocyanate, 2,6-diisocyanate methyl caproate, lysine diisocyanate, dimer acid diisocyanate, norbornene diisocyanate; Alicyclic diisocyanates such as 1,3-cyclopentane diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanate methyl-3,5,5-trimethylcyclohexyl isocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), methyl-2,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, 1,3-bis(isocyanate methyl)cyclohexane, 1,4-bis(isocyanate methyl)cyclohexane, isophorone diisocyanate (IPDI), norbornane diisocyanate, dicyclohexylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated xylylene diisocyanate; m-phenylenediisocyanate, p-phenylenediisocyanate, 2,4-tolylenediisocyanate (TDI), 2,6-tolylenediisocyanate (TDI), naphthylene-1,4-diisocyanate, naphthylene-1,5-diisocyanate, 4,4'-diphenyldiisocyanate, 4,4'-diphenylmethanediisocyanate (MDI), 2,4'-diphenylmethanediisocyanate, 4,4'-diphenylether Aromatic diisocyanates such as diisocyanates, 2-nitrodiphenyl-4,4'-diisocyanate, 2,2'-diphenylpropane-4,4'-diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, 4,4'-diphenylpropanediisocyanate, 3,3'-dimethoxydiphenyl-4,4'-diisocyanate, dianisidine diisocyanate, and tetramethylenexylylenediisocyanate; Examples include aromatic aliphatic diisocyanates such as 1,3-xylylene diisocyanate (XDI), 1,4-xylylene diisocyanate (XDI), ω,ω'-diisocyanate 1,4-diethylbenzene, 1,3-bis(1-isocyanate 1-methylethyl)benzene, 1,4-bis(1-isocyanate 1-methylethyl)benzene, and 1,3-bis(α,α-dimethylisocyanate methyl)benzene; and derivatives of these isocyanates by alohanate, biuret, dimerization (uretidione), trimerization (isocyanurate), adductation, carbodiimide reaction, etc., as well as mixtures thereof, and reaction products of these isocyanate compounds with compounds that can react with them.

[0079] It is preferable that the aforementioned component (C) includes a trimer obtained by trimming isocyanate (isocyanurate). By using a trimer, together with component (B), a more three-dimensional network structure can be formed more easily, and the effects of the present invention can be further enhanced.

[0080] The heat storage material composition of the present invention comprises a heat storage material containing component (A), component (B), and component (C), and a heat storage molded article can be obtained by reaction curing of component (B) and component (C).

[0081] In the heat storage material composition of the present invention, it is preferable to first mix a heat storage material containing component (A), component (B), and then mix in component (C) and allow the mixture to react and harden to obtain a heat storage molded article.

[0082] The heat storage material composition of the present invention preferably has a mixing ratio of component (B) and component (C) of 0.75 to 2.2 in terms of NCO / OH ratio (equivalent ratio), more preferably 0.9 to 2.1, and even more preferably 1.05 to 2.0. When the NCO / OH ratio is within the above range, it exhibits excellent formability and curability, forms a stronger three-dimensional network structure, and makes it easier to uniformly support and hold the heat storage material containing component (A) within the three-dimensional network structure, thus proving useful.

[0083] The heat storage material composition of the present invention may also contain additives such as layered clay minerals, surfactants, thermal conductive substances, compatibilizers, reaction accelerators, flame retardants, pigments, aggregates, viscosity modifiers, plasticizers, buffers, dispersants, crosslinking agents, pH adjusters, preservatives, antifungal agents, antibacterial agents, antialgal agents, wetting agents, defoaming agents, leveling agents, lubricants, dehydrating agents, ultraviolet absorbers, antioxidants, light stabilizers, fibers, fragrances, chemical adsorbents, photocatalysts, and moisture-absorbing and releasing powders and granules, in addition to the heat storage material containing component (A) above.

[0084] (Heat-storing molded body) The present invention relates to a heat-storage molded body characterized by being formed from the heat-storage material composition. The heat-storage molded body can be obtained by curing the heat-storage material composition, or by laminating the heat-storage molded body with various substrates and applying it, or by impregnating and curing the heat-storage material composition into a porous substrate and applying it as a heat-storage member, or by laminating the heat-storage member with various substrates and applying it.

[0085] From the viewpoint of heat storage capacity, the latent heat content of the heat-storing molded body is preferably 70 J / g or more as a lower limit, more preferably 100 J / g or more, and preferably 220 J / g or less as an upper limit, more preferably 200 J / g or less.

[0086] The phase change temperature (melting point or solidification point) of the heat-storing molded body is preferably around 10 to 60°C, and more preferably around 15 to 50°C, for example, when used as an interior or exterior material for buildings.

[0087] Examples of the porous substrates include natural fibers such as cotton, hemp, wool, and silk; organic fibers such as nylon, tetron, acrylic, polyester, polyurethane, vinylon, rayon, aramid, and azole; woven and nonwoven fabrics of inorganic fibers such as glass; paper substrates such as paper and corrugated cardboard; fibrous substrates such as MDF, insulation board, and particleboard; porous substrates such as slate board, gypsum board, ALC board, calcium silicate board, wood wool cement board, and plywood; wood substrates such as bamboo charcoal and charcoal; and foamed resin substrates such as foamed urethane board and expanded styrene board.

[0088] Furthermore, examples of the various substrates include thermal insulation substrates such as polystyrene foam, polyurethane foam, acrylic resin foam, phenolic resin foam, polyethylene resin foam, foamed rubber, glass wool, rock wool, and foamed ceramic; resin substrates such as acrylic resin and vinyl resin; glass substrates; metal substrates such as copper, aluminum, iron, brass, zinc, magnesium, and nickel; inorganic substrates such as concrete; and the porous substrates mentioned above.

[0089] The heat storage material of the present invention, the heat storage material composition containing the heat storage material, and the heat storage molded articles obtained using the same can be suitably used as materials for interior and exterior materials such as interior wall materials, exterior wall materials, ceiling materials, floor materials, bonding materials, and partition materials for buildings such as houses. Furthermore, the heat storage material composition of the present invention can also be applied as a material used in, for example, floor heating systems, heating and cooling systems, interior materials for vehicles, industrial products such as machinery and equipment, thermoelectric conversion systems, heat insulation materials, protective materials and protective clothing in extremely cold or fire-prone areas, as well as in polar regions and outer space, heat transfer media, refrigerators and freezers for transporting and storing food and pharmaceuticals, vending machines, bathtubs and bathrooms, greenhouses, soil, cooler boxes, heat insulation sheets, condensation prevention sheets, cooling sheets, electrical products, office automation equipment, plants, tanks, clothing, curtains, carpets, bedding, and daily necessities.

[0090] The heat storage material and heat storage material composition of the present invention can be used in various ways, for example, by sealing them in cases or bags, impregnating them into a substrate, encapsulating them, or immobilizing them together with a binder, making them useful. [Examples]

[0091] Examples are given below to further clarify the features of the present invention. However, the present invention is not limited to the examples provided herein.

[0092] (Synthesis Example 1: Synthesis of saturated fatty acid monoester (A-1)1) A 1L four-necked flask, fitted with a thermometer, nitrogen inlet tube, stirrer, Liebig condenser, and 20mL oil-water separator tube, was charged with 299.1g of decanoic acid (NOF Co., Ltd., NAA-102) and 400.9g of hexadecyl alcohol (NOF Co., Ltd., NAA-44). The reaction solution was heated to 240°C while removing the reaction water accumulated in the oil-water separator tube. The acid value of the reaction solution was measured every hour, and the reaction was continued until the decrease in acid value per hour was 0.5 mg KOH / g or less. Subsequently, the reaction mixture was reduced to 30 Torr at 220°C to remove the alcohol and volatile reaction byproducts. After cooling the reaction mixture to 85°C, 1.5 equivalents of sodium hydroxide, calculated from the acid value, were diluted with deionized water to prepare a 10% by mass aqueous solution. This solution was added to the reaction mixture and stirred for 1 hour. After stopping the stirring, the mixture was allowed to stand for 30 minutes, and the aqueous layer that had separated at the bottom was removed. Next, 20% by mass of deionized water was added to the reaction mixture, and the mixture was stirred at 85°C for 10 minutes, then allowed to stand for 15 minutes. This process of removing the separated aqueous layer was repeated five times. After that, the mixture was dehydrated by stirring at 100°C and 30 Torr for 1 hour. Finally, 2% by mass of activated clay was added to the reaction mixture, and the mixture was stirred at 80°C and 30 Torr for 1 hour. The adsorbent was then removed by filtration. This yielded saturated fatty acid monoester (A-1) 1, which is hexadecyl decanoate.

[0093] By appropriately substituting decanoic acid and hexadecyl alcohol in Synthesis Example 1 with other compounds shown in Tables 1 and 2, and performing the procedure in accordance with Synthesis Example 1, the "saturated fatty acid monoester (A-1)," "saturated fatty acid monoester (A-2), etc." shown in Tables 1 and 2 were synthesized.

[0094] (Acid value and hydroxyl value) In accordance with JIS K 0070, the acid value (mgKOH / g) and hydroxyl value (mgKOH / g) of each fatty acid ester shown in Tables 1 and 2 were measured.

[0095] (Melting point and freezing point measurement test) Two wooden boards (130mm x 85mm x 6mm) were prepared by impregnating each fatty acid ester (kept at 50°C) shown in Tables 1 and 2 with 22g of each ester. A thermocouple was placed in the center of the two wooden boards to obtain a test specimen. The obtained test specimens were left to stand in a 39°C incubator for 6 hours, then moved to a 19°C incubator and left to stand for 3 hours, and then left to stand in a 39°C incubator for another 3 hours. The temperature change was measured using a thermocouple, and the measurement results (Example 1 shown below) are shown in Figure 1. The melting point (°C) and freezing point (°C) were measured using the tangential method shown in Figure 1, and the difference between the melting point and freezing point (°C) was calculated. The evaluation is as follows. The evaluation results are shown in Table 3. The temperature inside the incubator was based on +10°C and -10°C from the phase change temperature of the fatty acid ester being measured. An evaluation of 4, 3, or 2 was considered effective. Furthermore, similar to Example 1, test specimens were prepared and evaluated for other examples, comparative examples, and reference examples (except for Example 1, these are not shown). 4. The difference between the melting point and the freezing point was less than 1°C. 3: The difference between the melting point and the freezing point was 1°C or more and less than 2°C. 2: The difference between the melting point and the freezing point was 2°C or more and less than 2.5°C. 1: The difference between the melting point and the freezing point was 2.5°C or more.

[0096] (Heat storage test 1) Using each fatty acid ester shown in Tables 1 and 2, 50g was weighed onto a metal container (160mm × 109mm × 27mm), and the latent heat (J / g) was measured using a differential scanning calorimeter (Hitachi High-Tech Science Corporation DSC7000X). Specifically, the average value of the latent heat of solidification and the latent heat of fusion was used to evaluate the heat storage capacity when the temperature was changed from 60°C to -40°C and then from -40°C to 60°C at heating and cooling rates of 10°C / min, and the temperature was changed again. The evaluation is as follows. The evaluation results are shown in Table 3 below. An evaluation of 3 or 2 was considered effective. 3: The latent heat content was 150 J / g or more. 2: The latent heat content was between 120 J / g and less than 150 J / g. 1: The latent heat content was less than 120 J / g.

[0097] (Emission resistance test 1) Each fatty acid ester shown in Tables 1 and 2 was weighed to 30 g on a metal container (160 mm × 109 mm × 27 mm), and the change in mass before and after storage at 80°C for 30 days was measured and evaluated. The evaluation is as follows. The evaluation results are shown in Table 3. An evaluation of 4 or 3 was considered effective. 4. The mass change was less than 1%. 3: The mass change was between 1% and less than 5%. 2: The mass change was between 5% and less than 10%. 1: The mass change was 10% or more.

[0098] (Hydrolysis resistance test) Each fatty acid ester shown in Tables 1 and 2 was subjected to a hydrolysis resistance test (94°C for 2 days) in accordance with ASTM-D261, and the change in acid value before and after the test was measured and evaluated. The evaluation is as follows. The evaluation results are shown in Table 3. An evaluation of 3 or 2 was considered effective. 3: The change in acid value was less than 0.20. 2: The change in acid value was between 0.20 and less than 0.50. 1: The change in acid value was 0.50 or greater.

[0099] (Curing test) Using the raw materials (compositions) shown in Table 4, the raw materials were mixed at a temperature of 50°C in the proportions shown in Tables 5 and 6. 50g was weighed onto a metal container (160mm × 109mm × 27mm), and cured at 80°C for 5 hours to obtain test specimens. The condition of the obtained test specimens was observed and evaluated. The evaluation is as follows. The evaluation results are shown in Tables 5 and 6. A rating of 4 or 3 was considered effective. 4: It had hardened uniformly. 3: It had hardened almost uniformly. 2: Uneven hardening and layer separation were observed. 1: It did not harden and remained in liquid form.

[0100] (Leak resistance test) The specimens obtained in the curing test described above were cured at 15°C for 12 hours, then cured at 50°C for 5 hours to obtain new specimens. The obtained specimens were tilted at a 45° angle, and the amount of heat storage material that leaked (dried off) from the surface of the specimens was measured and evaluated. The evaluation is as follows. The evaluation results are shown in Tables 5 and 6. A rating of 5, 4, or 3 was considered effective. 5: No leakage of the heat storage material was observed. 4. The amount of heat storage material leakage was less than 1%. 3: The amount of heat storage material leakage was between 1% and 2%. 2: The amount of heat storage material leakage was between 2% and 3%. 1: The amount of heat storage material leakage was 3% or more.

[0101] (Emission resistance test 2) The test specimens obtained in the above curing test were evaluated by measuring the change in mass before and after storage at 80°C for 30 days. The evaluation is as follows. The evaluation results are shown in Tables 5 and 6. A rating of 4 or 3 was considered effective. 4. The mass change was less than 1%. 3: The mass change was between 1% and less than 5%. 2: The mass change was between 5% and less than 10%. 1: The mass change was 10% or more.

[0102] (Heat storage test 2) The latent heat content (J / g) of the specimens obtained in the above curing test was measured and evaluated using a differential scanning calorimeter (DSC7000X, Hitachi High-Tech Science Corporation). Specifically, the average value of the latent heat of solidification and the latent heat of fusion measured at a heating rate of 10°C / min and a cooling rate of 10°C / min was used as the latent heat content (J / g) to evaluate the heat storage capacity. The evaluation is as follows. The evaluation results are shown in Tables 5 and 6. An evaluation of 3 or 2 was considered effective. 3: The latent heat content was 100 J / g or more. 2: The latent heat content was between 70 J / g and less than 100 J / g. 1: The latent heat of heat was less than 70 J / g.

[0103] [Table 1]

[0104] [Table 2]

[0105] [Table 3]

[0106] [Table 4]

[0107] [Table 5]

[0108] [Table 6] In Table 6 above, a "-" indicates that, in the case of the leak resistance test, the test could not be performed because the test specimen did not harden. In the case of the emission resistance test and the heat storage test, it means that the test could not be performed accurately because the test specimen did not harden, or in the case of the leak resistance test, there was excessive leakage.

[0109] From the evaluation results in Table 3 above, it was confirmed that in all examples, using component (A-1) as a heat storage material satisfied all the required properties. On the other hand, in Reference Example 1, Comparative Examples 1 and 2, the difference between the melting point and the freezing point was larger compared to the Examples. In particular, in Comparative Examples 1 and 2, because the desired component (A) was not used, the difference between the melting point and the freezing point was especially large, and the resistance to emission and hydrolysis was also inferior compared to the Examples.

[0110] Furthermore, from the evaluation results in Tables 5 and 6 above, it was confirmed that in all examples, the heat storage molded articles obtained using the heat storage material composition containing the desired (A) to (C) components contributed to curability, heat storage, heat dissipation resistance, and leak resistance. On the other hand, in the comparative examples and reference examples, no material was obtained that simultaneously satisfied all of the following: curability, heat storage, heat dissipation resistance, and leakage resistance. [Brief explanation of the drawing]

[0111] [Figure 1] These are the results of the melting point and freezing point measurement tests for the saturated fatty acid monoester used in Example 1.

Claims

1. A heat storage material composition comprising a saturated fatty acid monoester (A) obtained by reacting a saturated aliphatic monocarboxylic acid having a linear alkyl group having 8 to 20 carbon atoms and a saturated aliphatic monoalcohol having a linear alkyl group having 8 to 20 carbon atoms, a polyol (B), and an isocyanate (C), The saturated fatty acid monoester (A) is obtained by reacting a saturated aliphatic monocarboxylic acid (a-c) having a linear alkyl group with 8 to 20 carbon atoms (Nc), and a saturated aliphatic monoalcohol (a-a) having a linear alkyl group with 8 to 20 carbon atoms (Na). It contains a saturated fatty acid monoester (A-1) that satisfies the following formulas (1) to (3), The heat storage material comprises only the saturated fatty acid monoester (A-1), The polyol (B) includes polyester polyol (B-1), A heat storage material composition characterized in that the (B-1) component contains a castor oil-based polyester polyol. (1) (Nc)<(Na) (2) 22≦(Nc+Na)≦28 (3) 4≦(Na-Nc)≦8

2. The heat storage material composition according to claim 1, characterized in that the content ratio of the heat storage material in the total amount of the heat storage material composition is 50% by mass or more and 95% by mass or less.

3. The heat storage material composition according to claim 1, characterized in that the (B-1) component comprises a polyester polyol having a number average molecular weight of 1000 or more and 4000 or less, and having 2 or more or less than 3 functional groups.

4. The polyol (B) further comprises a polyether polyol (B-2), The heat storage material composition according to any one of claims 1 to 3, characterized in that the (B-2) component contains a polyether polyol having a number average molecular weight of 1,000 or more and 12,000 or less, and 2 or more or 3 or less functional groups.

5. The heat storage material composition according to any one of claims 1 to 4, characterized in that the (C) component contains a trimer of isocyanate.

6. The heat storage material composition according to any one of claims 1 to 5, characterized in that the total amount of component (B-1) and component (B-2) and the mixing ratio of component (C) is 0.75 or more and 2.2 or less in terms of NCO / OH ratio.

7. A heat-storage molded article characterized by being formed from a heat-storage material composition according to any one of claims 1 to 6.

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