JP7419140B2 - Inorganic latent heat storage material composition - Google Patents

Description

The present invention relates to an inorganic latent heat storage material composition.

In recent years, from an environmental perspective, in the technical field of building materials such as wall materials, floor materials, ceiling materials, and roof materials, efforts have been made to more effectively utilize the thermal energy generated during indoor heating and natural energy such as sunlight. Research and development are actively being carried out. Specifically, many latent heat storage material compositions have been developed for application to wall materials, floor materials, ceiling materials, and the like.

Until now, organic latent heat storage material compositions have been mainly used as latent heat storage material compositions (sometimes referred to as "PCM: Phase Change Materials") (Patent Document 1).

However, since organic latent heat storage material compositions are expensive and have problems such as flammability, in recent years, the use of members to replace organic latent heat storage material compositions has been attracting attention. An example of such a new member is a member using an inorganic latent heat storage material composition. As techniques related to inorganic latent heat storage material compositions, for example, techniques such as those listed in Patent Documents 2 to 4 are disclosed.

Patent Document 2 discloses that the main component is a latent heat storage substance (a), a melting point regulator (b), a phase separation inhibitor (c) having a fine crystal generation action, a supercooling prevention action, and a thickening action, and/or a fine A latent heat storage material composition is disclosed that contains a melting point regulator (b') having a crystal-forming effect and a supercooling inhibitor (d) in predetermined amounts as essential components.

Patent Document 3 discloses an inorganic latent heat storage material composition containing calcium chloride hexahydrate, a melting point regulator, a supercooling inhibitor, and a thickener.

Patent Document 4 discloses a heat storage material composition containing sodium sulfate decahydrate, sodium bromide, and sodium chloride as inorganic salts.

JP2017-145381 JP2015-218212 International Publication No. 2019/221006 International Publication No. 2017/164304

However, in the above-mentioned conventional technology, the manufacturing process of the inorganic latent heat storage material composition is complicated and/or the manufacturing process is time-consuming. There was room for further improvement in the method.

One embodiment of the present invention has been made in view of the above-mentioned problems, and its purpose is to provide an inorganic latent heat storage material composition that can efficiently provide a gel-like inorganic latent heat storage material composition. The object of the present invention is to provide a new manufacturing method.

As a result of intensive studies to solve the above problems, the present inventors have discovered that a gel-like inorganic latent heat storage material composition can be created by adding a main ingredient precursor to an aqueous solution containing a water-soluble inorganic salt and a thickener. It was discovered for the first time that it is possible to efficiently provide the following, and this led to the completion of the present invention.

That is, one embodiment of the present invention includes the following configuration.
[1] A method for producing an inorganic latent heat storage material composition, comprising:
A base ingredient precursor addition step of adding a base ingredient precursor into an aqueous solution containing a water-soluble inorganic salt and a thickener, wherein the inorganic latent heat storage material composition includes 100 parts by weight of the base agent and 1 weight part of the thickener. A method for producing an inorganic latent heat storage material composition, comprising 10 parts to 10 parts by weight and the water-soluble inorganic salt.
[2] Prior to the main ingredient precursor addition step, the aqueous solution preparation step further includes preparing the aqueous solution, and the aqueous solution preparation step includes adding (a) the thickening agent to the mixed solution containing water and the water-soluble inorganic salt. and (b) a dispersion step of dispersing a poorly water-soluble inorganic salt and/or a phase separation preventive agent, the inorganic latent heat storage material composition comprising a dispersion step of dispersing a poorly water-soluble inorganic salt and/or a phase separation preventive agent. The method for producing an inorganic latent heat storage material composition according to [1], further comprising: the phase separation inhibitor in an amount of 1 to 10 parts by weight based on 100 parts by weight of the main agent.
[3] The method for producing an inorganic latent heat storage material composition according to [1] or [2], wherein the thickener is a cellulose derivative.
[4] The main agent precursor is selected from the group consisting of anhydrous sodium acetate, anhydrous sodium sulfate, anhydrous calcium chloride, anhydrous calcium chloride, anhydrous disodium hydrogen phosphate, and anhydrous sodium carbonate. The method for producing at least one inorganic latent heat storage material composition according to any one of [1] to [3].
[5] The phase separation inhibitor is at least one selected from the group consisting of fatty acids, glycerin, vegetable oils, paraffins, and nonionic surfactants having a melting point of 20°C or lower, [2] to [ 4] The method for producing an inorganic latent heat storage material composition according to any one of the above.
[6] The viscosity of the inorganic latent heat storage material composition is 2 to 25 Pa·s when measured by a vibrational viscometer at the melting temperature of the inorganic latent heat storage material composition of +10°C to +35°C. The method for producing an inorganic latent heat storage material composition according to any one of [1] to [5].
[7] The method for producing an inorganic latent heat storage material composition according to any one of [1] to [6], wherein the inorganic latent heat storage material composition has a melting temperature of 15° C. to 30° C.

According to one embodiment of the present invention, it is possible to provide a novel method for producing an inorganic latent heat storage material composition that can efficiently provide a gel-like inorganic latent heat storage material composition.

An embodiment of the present invention will be described below, but the present invention is not limited thereto. The present invention is not limited to each configuration described below, and various changes can be made within the scope of the claims. Further, embodiments or examples obtained by appropriately combining technical means disclosed in different embodiments or examples are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment. Note that all academic literature and patent literature described in this specification are incorporated as references in this specification. In addition, unless otherwise specified in this specification, the numerical range "A to B" is intended to be "above A (including A and greater than A) and less than or equal to B (including B and less than B)."

[1. Technical idea of one embodiment of the present invention]
As a result of intensive studies, the present inventor found that the techniques described in Patent Documents 2 to 4 described above have room for improvement as described below.

In the technique described in Patent Document 2, the inorganic salt (ie, the main ingredient) itself, which occupies most of the composition, is used as a raw material for producing the composition. The present inventors discovered that in the technique described in Patent Document 2, it is necessary to heat the mixture in order to dissolve the base ingredient, and as a result, the manufacturing process of the composition becomes complicated, time consuming, and costly. We independently discovered that.

In the technology described in Patent Document 3, a precursor of an inorganic salt (i.e., a main ingredient), which accounts for most of the composition, is mixed with other materials at the first stage of the manufacturing process, dissolved, and then added to the resulting mixture. Furthermore, other compounds (eg, inorganic salts) are dissolved. The present inventors discovered that in the technique described in Patent Document 3, it is necessary to heat the solution in which the precursor of the main ingredient is dissolved in order to dissolve other compounds, and as a result, the manufacturing process of the composition is complicated. We independently discovered that this method is time consuming and costly.

In the technique described in Patent Document 4, the composition is manufactured by mixing all the raw materials of the composition while grinding them in a mortar. The present inventors discovered that with the technique described in Patent Document 4, in order to uniformly mix all the components contained in the composition, it is necessary to sufficiently grind the raw materials in a mortar, and as a result, the composition We independently discovered that the manufacturing process requires time and technology.

As described above, the techniques described in Patent Documents 2 to 4 have room for further improvement in the method for producing an inorganic latent heat storage material composition. One embodiment of the present invention has been made in view of the above problems, and its purpose is to provide a novel manufacturing method that can efficiently provide a gel-like inorganic latent heat storage material composition.

As a result of intensive studies to solve the above problems, the present inventors discovered the following points for the first time, leading to the completion of the present invention: A main ingredient precursor in an aqueous solution containing a water-soluble inorganic salt and a thickener. By adding , it is possible to utilize the heat of dissolution or heat of hydration (exothermic heat) generated when the main ingredient precursor becomes the main ingredient, and as a result, it is possible to efficiently provide a gel-like inorganic latent heat storage material composition. can.

[2. Method for producing inorganic latent heat storage material composition]
A method for producing an inorganic latent heat storage material composition according to an embodiment of the present invention is a method for producing an inorganic latent heat storage material composition, in which a main ingredient precursor is added to an aqueous solution containing a water-soluble inorganic salt and a thickener. The inorganic latent heat storage material composition includes 100 parts by weight of the main agent, 1 to 10 parts by weight of the thickener, and the water-soluble inorganic salt. An inorganic latent heat storage material composition obtained by the method for producing an inorganic latent heat storage material composition according to an embodiment of the present invention is also an embodiment of the present invention.

A method for producing an inorganic latent heat storage material composition may be hereinafter referred to as a "manufacturing method," and an inorganic latent heat storage material composition may be hereinafter referred to as a "composition." The method for manufacturing an inorganic latent heat storage material composition according to an embodiment of the present invention may be hereinafter referred to as the "present manufacturing method", and the inorganic latent heat storage material composition according to an embodiment of the present invention may be hereinafter referred to as "the present composition". Sometimes referred to as "thing".

Since the present manufacturing method has the above configuration, it has the advantage that a gel-like inorganic latent heat storage material composition can be efficiently provided.

(2-1. Base resin precursor addition step)
As used herein, the term "base ingredient precursor" refers to a compound that (a) becomes a main component, that is, a main ingredient, and (b) can function as a component of a latent heat type heat storage agent in the resulting composition. . As used herein, the term "base ingredient" refers to the main component in the composition, and specifically refers to a component that accounts for 50% by weight or more in 100% by weight of the composition.

As used herein, the term "water-soluble inorganic salt" refers to an inorganic salt having a solubility in water at 25°C of 0.01 g/ml or more.

The main ingredient precursor is not particularly limited, and can be appropriately selected based on the desired melting temperature and viscosity of the composition. The base agent precursor may be the same substance as the base agent in the resulting composition. The main ingredient precursor is preferably an inorganic salt that (a1) forms a hydrate upon contact with water, and (b1) generates heat with the formation of the hydrate, that is, exhibits a positive heat of solution. . This configuration has the advantage that the composition can be manufactured more efficiently and stably. More specifically, when using a base material precursor that satisfies (a1) and (b1) above, the production method has the following advantages: (a) The aqueous solution before adding the base material precursor is gelled. and (b) the addition of the main ingredient precursor into the aqueous solution allows the resulting composition to be easily brought into a gel state by the action of the thickener, without the need for heating or with a little heating. That advantage. When using a base ingredient precursor that satisfies (a1) above, the resulting composition may contain a hydrate formed from the base ingredient precursor as the base ingredient.

In the base material precursor addition step, the method of adding the base material precursor to the aqueous solution is not particularly limited. When using a base material precursor that satisfies (a1) and (b1) above, the base material precursor added to the aqueous solution is not in a container state but in a solid state in order to make maximum use of the heat generated by the addition of the base material precursor. It is preferable.

In the base ingredient precursor addition step, it is preferable to add the base ingredient precursor to the aqueous solution and then stir the resulting mixture. The device used for the stirring is not particularly limited, and any known device can be used as appropriate. For the stirring, for example, a mixer such as an intensive mixer, a stirrer, a shaker, etc. can be used. The stirring conditions are not particularly limited. For example, when using an intensive mixer as the stirring device, the rotor rotation speed is preferably 100 rpm to 2000 rpm, more preferably 200 rpm to 1800 rpm, even more preferably 300 rpm to 1500 rpm, and particularly preferably 500 rpm to 1500 rpm. For example, when using an intensive mixer as the stirring device, the pan rotation speed is preferably 5 rpm to 40 rpm, more preferably 10 rpm to 35 rpm, particularly preferably 15 rpm to 30 rpm.

After adding the base resin precursor to the aqueous solution, the resulting mixture may be heated. The device used for the heating is not particularly limited, and any known device can be used as appropriate. For the heating, for example, a heating means provided in a device used for stirring the mixture may be used. The heating temperature of the mixture is not particularly limited, and is preferably 25°C to 70°C, more preferably 30°C to 70°C, more preferably 35°C to 70°C, more preferably 40°C to 70°C, and more preferably 45°C to 70°C. 65°C is more preferred, and 50°C to 60°C is particularly preferred.

When using a base resin precursor that satisfies (a1) and (b1) above, the temperature of the mixture obtained by adding the base resin precursor to an aqueous solution may increase. Therefore, it is not necessary to heat the mixture, but in order to improve production efficiency, the mixture may be heated. The temperature of the mixture obtained by adding the main ingredient precursor to the aqueous solution is preferably not too high in order to suppress the decomposition of the thickener due to heat and to prevent the viscosity of the mixture from decreasing too much due to heat. For example, , the temperature is preferably such that water in the mixture is difficult to evaporate. Specifically, the temperature of the mixture obtained by adding the main ingredient precursor to the aqueous solution is preferably 100°C or lower, more preferably 90°C or lower, even more preferably 85°C or lower, and particularly preferably 80°C or lower. Therefore, when using a base resin precursor that satisfies (a1) and (b1) above, care should be taken to ensure that the mixture obtained by adding the base resin precursor to an aqueous solution does not exceed the above-mentioned temperature range (for example, 100°C). It is preferable to end the main ingredient precursor addition step by ending stirring of the mixture or by cooling the mixture.

(2-2. Aqueous solution preparation process)
It is preferable that the present manufacturing method further includes an aqueous solution preparation step of preparing an aqueous solution before the main ingredient precursor addition step. The aqueous solution preparation step includes a dispersion step of dispersing (a) the thickener, and (b) a poorly water-soluble inorganic salt and/or a phase separation inhibitor in a mixed solution containing water and the water-soluble inorganic salt. is preferred. Moreover, it is preferable that the aqueous solution preparation step further includes a liquid mixture preparation process of preparing a liquid mixture containing water and a water-soluble inorganic salt. When the present manufacturing method further includes an aqueous solution preparation step, a mixed liquid preparation step, and a dispersion step in addition to the base agent precursor addition step, the aqueous solution preparation step and the base agent precursor addition step are performed in this order, and in the aqueous solution preparation step, The liquid mixture preparation step and the dispersion step are performed in this order. When the present production method further includes an aqueous solution preparation step, a liquid mixture preparation step, and/or a dispersion step, the production method has the advantage that the composition can be provided more efficiently and stably. In addition, when the present production method further includes an aqueous solution preparation step, a mixed solution preparation step, and/or a dispersion step, an inorganic latent heat storage material composition further containing a poorly water-soluble inorganic salt and/or a phase separation inhibitor can be obtained. I can do it.

As used herein, the term "poorly water-soluble inorganic salt" refers to an inorganic salt having a solubility in water at 25°C of less than 0.01 g/ml.

(2-2-1. Mixed liquid preparation process)
The specific embodiment of the liquid mixture preparation step is not particularly limited, and may be an embodiment in which water and a water-soluble inorganic salt are simply mixed. It is preferable that the water-soluble inorganic salt is completely dissolved in the liquid mixture obtained in the liquid mixture preparation step. In order to prepare a liquid mixture in which the water-soluble inorganic salt is completely dissolved, it is preferable to stir and/or heat the liquid mixture obtained by mixing water and the water-soluble inorganic salt.

In the mixed solution preparation step, the device used for stirring the mixed solution is not particularly limited, and known devices, such as the devices listed as devices used for stirring the mixture in the main ingredient precursor addition step, can be used as appropriate. For example, when using an intensive mixer as the stirring device, the rotor rotation speed is preferably 100 rpm to 2000 rpm, more preferably 200 rpm to 1800 rpm, even more preferably 300 rpm to 1500 rpm, and particularly preferably 500 rpm to 1500 rpm. For example, when using an intensive mixer as the stirring device, the pan rotation speed is preferably 5 rpm to 40 rpm, more preferably 10 rpm to 35 rpm, particularly preferably 15 rpm to 30 rpm.

In the mixed liquid preparation step, the device used for heating the mixed liquid is not particularly limited, and any known device can be used as appropriate. As the device used for heating the mixed solution, a heating means provided in a device used for stirring the mixed solution may be used. The heating temperature of the liquid mixture is not particularly limited, and is preferably 30°C to 60°C, more preferably 35°C to 55°C, and particularly preferably 40°C to 50°C.

(2-2-2. Dispersion process)
In the dispersion step, an aqueous solution to be used in the base resin precursor addition step can be obtained. The specific embodiment of the dispersion step is not particularly limited as long as it is possible to obtain an aqueous solution in which the thickener, poorly water-soluble inorganic salt, and/or phase separation inhibitor are dispersed. In this specification, "an aqueous solution in which a thickener, a poorly water-soluble inorganic salt, and/or a phase separation inhibitor are dispersed" means that 1 L of an aqueous solution is passed from the top to the bottom of a 16-mesh sieve into a sieve with a pore size of 50 mm. It is intended to be an aqueous solution that can pass through a sieve when flowing through a tube at a flow rate of 1 L/min or less, in other words, no solid remains on the sieve.

As an embodiment of the dispersion step, for example, (a) a thickener and (b) a poorly water-soluble inorganic salt and/or a phase separation inhibitor are added to the mixed liquid, and the thickener and the poorly water-soluble inorganic salt are added. And/or the obtained aqueous solution may be mixed until the phase separation inhibitor is dispersed. It is preferable that the dispersion state of (a) the thickener and (b) the poorly water-soluble inorganic salt and/or the phase separation inhibitor in the aqueous solution obtained in the dispersion step be as uniform as possible. In order to obtain an aqueous solution in which (a) the thickener and (b) the poorly water-soluble inorganic salt and/or the phase separation inhibitor are well dispersed, it is preferable to stir and/or heat the aqueous solution.

In the dispersion step, the device used for stirring the aqueous solution is not particularly limited, and known devices, such as those listed as devices used for stirring the mixture in the main ingredient precursor addition step, can be used as appropriate. For example, when using an intensive mixer as the stirring device, the rotor rotation speed is preferably 100 rpm to 2000 rpm, more preferably 200 rpm to 1800 rpm, even more preferably 300 rpm to 1500 rpm, and particularly preferably 500 rpm to 1500 rpm. For example, when using an intensive mixer as the stirring device, the pan rotation speed is preferably 5 rpm to 40 rpm, more preferably 10 rpm to 35 rpm, particularly preferably 15 rpm to 30 rpm.

In the dispersion step, the device used for heating the aqueous solution is not particularly limited, and any known device can be used as appropriate. As the device used for heating the aqueous solution, a heating means provided in a device used for stirring the aqueous solution may be used. The heating temperature of the aqueous solution is not particularly limited, but is preferably 10°C to 50°C, more preferably 10°C to 45°C, more preferably 10°C to 40°C, more preferably 15°C to 40°C, and more preferably 20°C to 40°C. The temperature is more preferably 40°C, more preferably 25°C to 40°C, even more preferably 30°C to 40°C, and particularly preferably 30°C to 35°C. The heating temperature of the aqueous solution may be 35°C to 45°C. In order to uniformly mix the aqueous solution and the main agent precursor in the subsequent main agent precursor addition step, the aqueous solution obtained in the dispersion step is preferably not gelled. In order to suppress gelation of the aqueous solution obtained in the dispersion step due to heat, it is preferable that the temperature of the aqueous solution obtained in the dispersion step is not too high. The temperature of the aqueous solution obtained in the dispersion step is, for example, preferably 10°C to 50°C or lower, more preferably 45°C or lower, even more preferably 40°C or lower, and particularly preferably 35°C or lower.

In the dispersion process, when the thickener is added to the mixed liquid before the poorly water-soluble inorganic salt and/or the phase separation inhibitor (case A), the thickener is added to the mixed liquid before the slightly water-soluble inorganic salt and/or the phase separation inhibitor. A case where the thickener is added to the liquid mixture before the thickener (case B) will be explained. In case A, the thickener will be added to a clear mixture in which the water-soluble inorganic salt is completely dissolved. On the other hand, in case B, a poorly water-soluble inorganic salt and/or a phase separation inhibitor is added to a transparent mixed liquid in which a water-soluble inorganic salt is completely dissolved. The thickener is added to the mixed liquid in which the agent is dispersed. Therefore, it is easier to visually confirm the degree of dispersion of the thickener in case A than in case B. Therefore, in order to easily obtain an aqueous solution in which the thickener is uniformly dispersed, the thickener is added to the mixed liquid before the poorly water-soluble inorganic salt and/or the phase separation inhibitor in the dispersion process. It is preferable to do so. In other words, in the dispersion step, the poorly water-soluble inorganic salt and/or the phase separation inhibitor are preferably included in a liquid mixture containing a thickener (for example, in which the thickener is dispersed).

A case (case C) in which a poorly water-soluble inorganic salt and a phase separation inhibitor are used in the dispersion process will be described. In case C, a poorly water-soluble inorganic salt and a phase separation inhibitor are mixed in advance to prepare a dispersion in which the poorly water-soluble inorganic salt is dispersed in the phase separation inhibitor, and the dispersion is added to the mixed liquid. is preferred. In case C, a poorly water-soluble inorganic salt and a phase separation inhibitor are mixed in advance to prepare a dispersion in which the poorly water-soluble inorganic salt is dispersed in the phase separation inhibitor, and the dispersion is mixed with a thickener. It is more preferable to add it to a liquid mixture containing (for example, a thickener is dispersed). In the dispersion step, when (a) a poorly water-soluble inorganic salt and a phase separation inhibitor are used, and (b) the phase separation inhibitor is a liquid with low viscosity, for example, melting of the inorganic latent heat storage material composition A case where the viscosity obtained by measuring a phase separation inhibitor having a temperature of +10° C. to a melting temperature of +35° C. using an oscillating viscometer is less than 2 Pa·s (case D) will be described. In particular, in case D, a poorly water-soluble inorganic salt and a phase separation inhibitor are mixed in advance to prepare a dispersion in which the poorly water-soluble inorganic salt is dispersed in the phase separation inhibitor, and the dispersion is prepared by (a) It is preferable to add it to a liquid mixture or a liquid mixture containing (b) a thickener. In cases C and D, it is obtained by adding a dispersion of a poorly water-soluble inorganic salt in a phase separation inhibitor to (a) a mixed solution, or (b) a mixed solution containing a thickener. It has the advantage that poorly water-soluble inorganic salts can be more reliably dispersed in an aqueous solution.

Hereinafter, each compound used in this manufacturing method, that is, each component contained in this composition will be explained in detail.

(2-3. Main agent precursor)
The main ingredient precursor is an inorganic salt. In this production method, an inorganic salt is used as a main ingredient precursor. Therefore, the composition obtained by this production method, that is, the present composition, contains an inorganic salt as a main ingredient. As a result, the present composition has the advantage of being flame retardant compared to organic latent heat storage material compositions.

The base agent precursor is a group consisting of anhydrous sodium acetate, anhydrous sodium sulfate, anhydrous calcium chloride, anhydrous calcium chloride, anhydrous disodium hydrogen phosphate, and anhydrous sodium carbonate (hereinafter referred to as group (A)). ) is preferably at least one selected from the following. Inorganic salts belonging to group (A) (a) form a hydrate upon contact with water, and (b) generate heat with the formation of the hydrate, that is, exhibit a positive heat of solution. For example, as a base agent precursor that generates heat with the formation of a hydrate, (a) sodium acetate anhydride forms sodium acetate trihydrate upon contact with water, and (b) Anhydrous sodium sulfate forms sodium sulfate decahydrate upon contact with water, and generates heat with the formation of sodium sulfate decahydrate; (c) Anhydrous calcium chloride and/or or Calcium chloride dihydrate forms calcium chloride hexahydrate upon contact with water, and generates heat with the formation of calcium chloride hexahydrate; (d) Disodium hydrogen phosphate anhydrous forms calcium chloride hexahydrate upon contact with water; (e) Sodium carbonate anhydride forms sodium carbonate decahydrate upon contact with water, and exotherm is generated with the formation of disodium hydrogen phosphate decahydrate. and generates heat with the formation of sodium carbonate decahydrate. When the main ingredient precursor is at least one selected from the inorganic salts belonging to group (A), it is possible to easily produce a composition having a melting temperature of 15°C to 30°C by combining it with a water-soluble inorganic salt. It has the advantage of being possible.

As the main ingredient precursor, only one type of the above-mentioned compounds may be used, or two or more types may be used in combination.

The amount of the base agent contained in the present composition is not particularly limited, and can be appropriately set based on desired melting temperature, viscosity, etc. The present composition preferably contains 50 parts by weight or more of the base agent, more preferably 55 parts by weight or more, more preferably 60 parts by weight or more, and 65 parts by weight or more of the base agent based on 100 parts by weight of the total weight of the inorganic salt. It is more preferable to contain it, and it is particularly preferable to contain it in an amount of 70 parts by weight or more. According to this configuration, the resulting composition has a large amount of latent heat per weight, so it has the advantage of efficiently functioning as a heat storage material. The amount of the main ingredient precursor to be used in this production method is not particularly limited, and can be appropriately set so that the amount of the main ingredient in the resulting composition falls within the above range.

(a) The resulting composition can be used in a temperature range assuming a human living environment, and (b) The resulting composition has excellent durability and low odor. Preferably, it contains calcium chloride hexahydrate. The present composition more preferably contains 55 parts by weight or more of calcium chloride hexahydrate, more preferably 60 parts by weight or more, and further preferably contains 65 parts by weight or more of calcium chloride hexahydrate based on 100 parts by weight of the total weight of the inorganic salts. Preferably, it is particularly preferably contained in an amount of 70 parts by weight or more. In this production method, it is preferable to use calcium chloride hexahydrate as the main ingredient precursor so that the amount of calcium chloride hexahydrate, which is the main ingredient in the resulting composition, is within the above-mentioned range. In the present composition, the base agent is most preferably calcium chloride hexahydrate. In other words, in the present production method, the base agent precursor is calcium chloride anhydrous, calcium chloride dihydrate, and/or calcium chloride hexahydrate. Most preferably it is a hydrate.

In one embodiment of the present invention, an embodiment in which the base ingredient precursor used is sodium sulfate anhydride, that is, the base ingredient in the resulting composition is sodium sulfate decahydrate, is referred to as "Aspect A." In one embodiment of the present invention, the base agent precursor used is calcium chloride anhydrous, calcium chloride dihydrate and/or calcium chloride tetrahydrate, that is, the base agent in the resulting composition is calcium chloride hexahydrate. The embodiment that is a Japanese product is referred to as "Aspect B."

(2-4. Water-soluble inorganic salt)
In this specification, a "water-soluble inorganic salt" is an inorganic salt having a solubility in water at 25°C of 0.01 g/ml or more.

The water-soluble inorganic salt may have the function in the composition of (a) adjusting the melting temperature and/or solidification temperature of the composition, and/or (b) preventing supercooling of the composition. An "inorganic salt capable of adjusting the melting temperature and/or solidification temperature of a composition" may also be referred to as a "melting point modifier" or "freezing point depressant." "Inorganic salt capable of preventing supercooling of a composition" is referred to as a "supercooling inhibitor," "supercooling inhibitor," "crystal nucleating agent," "nucleating agent," or "nucleating agent." There is also. In this specification, the term "melting point regulator" refers to a "water-soluble inorganic salt that can adjust the melting temperature and/or solidification temperature of the composition," and may also be referred to as a "freezing point depressant." be. Moreover, in this specification, "a water-soluble inorganic salt capable of preventing supercooling of the composition" is also referred to as a "first supercooling inhibitor."

Water-soluble inorganic salts include, but are not particularly limited to, (a) the ability to adjust the melting temperature and/or solidification temperature of the composition, and/or (b) the ability to prevent supercooling of the composition; It is preferable that the compound has the following. That is, the water-soluble inorganic salt is preferably a "melting point regulator" and/or a "first supercooling inhibitor." According to this configuration, a composition having a desired melting temperature and/or solidification temperature and low supercooling can be obtained.

(2-5. Melting point regulator)
The melting point regulator is not particularly limited as long as it has the function of regulating the melting temperature and/or solidification temperature of the composition. The melting point regulator is preferably a metal bromide and/or a metal chloride, including (a) lithium bromide, sodium bromide, potassium bromide, calcium bromide, magnesium bromide, iron bromide, zinc bromide, bromide; More preferably, one or more selected from the group consisting of metal bromides such as barium, and (b) metal chlorides such as lithium chloride, sodium chloride, potassium chloride, magnesium chloride, iron chloride, zinc chloride, and cobalt chloride.

The melting point regulator may be a compound other than metal bromides and metal chlorides. Examples of melting point regulators other than metal bromides and metal chlorides include (c) ammonium salts, (d) metal halides other than metal bromides and metal chlorides, (e) metal non-halides, and (f) urea. can be mentioned.

Examples of ammonium salts that are melting point regulators include ammonium bromide, ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium carbonate, ammonium hydrogen carbonate, ammonium carbamate, ammonium formate, triammonium citrate, and ammonium acetate.

Examples of metal halides other than metal bromides and metal chlorides, which are melting point regulators, include lithium iodide, sodium iodide, potassium iodide, and the like.

Examples of metal non-halides that are melting point regulators include sodium sulfate, sodium nitrate, sodium acetate, sodium phosphate, sodium borohydride, sodium formate, sodium oxalate, sodium carbonate, sodium glutamate, sodium hydroxide, potassium sulfate, Potassium nitrate, potassium acetate, potassium phosphate, potassium borohydride, potassium formate, potassium oxalate, potassium carbonate, potassium glutamate, potassium hydroxide, calcium nitrate, calcium glutamate, aluminum sulfate, aluminum nitrate, magnesium sulfate, magnesium nitrate, carbonic acid Magnesium, magnesium glutamate, etc. can be mentioned.

The above-mentioned melting point regulators may be used alone or in combination of two or more.

Sodium bromide, potassium bromide, ammonium bromide, and the like can be used in small amounts to adjust the melting temperature and/or solidification temperature of the resulting composition to a desired temperature (for example, 15° C. to 30° C.). Therefore, it is more preferable that the melting point regulator is one or more selected from the group consisting of sodium bromide, potassium bromide, and ammonium bromide.

The melting point adjuster is preferably selected appropriately depending on the main ingredient precursor used, that is, it is preferably selected appropriately depending on the main ingredient in the resulting composition. In embodiment A, the melting point regulator is preferably (a) a mixture of sodium bromide and sodium chloride, and/or (b) urea. In embodiment B, the melting point regulator is preferably (a) a mixture of sodium bromide and potassium bromide, or (b) sodium bromide.

The amount of the melting point adjuster contained in the present composition is not particularly limited, and can be appropriately selected depending on the type of the main ingredient. In other words, the amount of the melting point regulator to be used in this production method is not particularly limited, and can be appropriately selected depending on the type of the base resin precursor to be used.

In aspect A, the total content of the melting point regulator in the composition is preferably 0.05 mol to 2.00 mol, more preferably 0.10 mol to 1.50 mol, per 1.0 mol of the main ingredient. , 0.50 mol to 1.50 mol is more preferable. With this configuration, when the resulting composition is used for building materials such as wall materials, flooring materials, ceiling materials, roofing materials, etc., the temperature of the space near the building material component or the space covered with the building material must be adjusted to an appropriate temperature. Temperature can be maintained with high precision. In Embodiment A, a case where the composition contains a total amount of 0.50 mol to 1.50 mol of the melting point regulator per 1.0 mol of the main ingredient will be described. In this case, when the resulting composition is used for building materials such as wall materials, floor materials, ceiling materials, roofing materials, etc., the temperature of the space near the building material component or the space covered with the building material component is 15 to 30°C. Can be maintained stably in the temperature range of ℃. In aspect A, the total amount of the melting point regulator used in the present manufacturing method can be appropriately set so that the total content of the melting point regulator in the resulting composition falls within the above range.

In aspect B, the total content of the melting point regulator in the composition is preferably 0.05 mol to 2.00 mol, more preferably 0.10 mol to 1.50 mol, per 1.0 mol of the main ingredient. , 0.15 mol to 1.00 mol is more preferable. With this configuration, when the resulting composition is used for building materials such as wall materials, flooring materials, ceiling materials, roofing materials, etc., the temperature of the space near the building material component or the space covered with the building material can be adjusted appropriately. temperature can be maintained with high precision. In aspect B, a case where the composition contains a total amount of 0.05 mol to 2.00 mol of the melting point regulator per 1.0 mol of the main ingredient will be described. In this case, when the resulting composition is used for building materials such as wall materials, floor materials, ceiling materials, roofing materials, etc., the temperature of the space near the building material component or the space covered with the building material component is 15 to 30°C. Can be maintained stably in the temperature range of ℃. In aspect B, the total amount of the melting point regulator used in the present manufacturing method can be appropriately set so that the total content of the melting point regulator in the resulting composition falls within the above range.

In addition, in cases other than aspects A and B, the total usage amount of the melting point regulator in the present production method and the total content of the melting point regulator in the present composition may be set as appropriate.

The content of ammonium salt contained in the present composition is preferably small because it is easy to handle, has a small environmental impact, and has little odor. The content of ammonium salt contained in the present composition is preferably 1% by weight or less, more preferably 0.5% by weight or less, and 0.1% by weight based on 100% by weight of the composition. % or less, further preferably 0.01% by weight or less, and particularly preferably 0% by weight. The amount of ammonium salt used in this production method can be appropriately set so that the content of ammonium salt in the resulting composition is within the above range. That is, it is particularly preferable that no ammonium salt be used in this production method.

In embodiment B, a case will be described in which a metal halide other than the metal bromide and the metal chloride is used as the melting point adjuster in addition to the metal bromide and/or the metal chloride. In this case, the amount of the metal halide other than metal bromide and metal chloride that is a melting point adjuster and is contained in the composition is preferably 1.0 mol or less per 1.0 mol of the main ingredient, and 0. The amount is more preferably .5 mol or less, and even more preferably 0.3 mol or less. According to this configuration, when the obtained composition is used for building materials such as wall materials, floor materials, ceiling materials, roofing materials, etc., the temperature of the space near the building material component or the space covered with the building material is adjusted to a desired temperature. It can be adjusted with high precision depending on the temperature. In this production method, the amount of metal halide other than metal bromide and metal chloride that is a melting point regulator is used such that the content of the metal halide in the resulting composition is within the above range. It can be set as appropriate.

In addition, in cases other than Embodiment B, (a) the amount of the metal halide used as a melting point regulator and other than metal bromide and metal chloride in this production method, and (b) the melting point regulator contained in the present composition. The amount of the metal halide other than the metal bromide and metal chloride that is the agent can be set as appropriate.

(2-6. First supercooling inhibitor)
The first supercooling inhibitor is not particularly limited as long as it is a water-soluble inorganic salt and has a function of preventing supercooling of the composition. As the first supercooling inhibitor, it is preferable to use a compound that can prevent supercooling of the composition using a relatively small amount and is easily available.

Examples of the first supercooling inhibitor include sodium pyrophosphate decahydrate, sodium tetraborate decahydrate, sodium carbonate, sodium carbonate monohydrate, sodium carbonate decahydrate, and barium bromate decahydrate. Hydrate, calcium sulfate dihydrate, alum, disodium dihydrogen pyrophosphate hexahydrate, calcium chloride, calcium bromide, aluminum chloride, disodium hydrogen phosphate dodecahydrate, disodium hydrogen phosphite Pentahydrate, trisodium phosphate dodecahydrate, sodium dihydrogen phosphate dihydrate, sodium chloride, potassium chloride, lithium chloride, barium chloride, strontium chloride, strontium chloride hexahydrate, barium sulfide, tartaric acid A group consisting of calcium, strontium hydroxide octahydrate, barium hydroxide octahydrate, sodium bromide, potassium bromide, magnesium bromide hexahydrate, calcium carbonate, calcium oxide, barium oxide, silicates, etc. One or more types can be mentioned. These first supercooling inhibitors may be used alone or in combination of two or more.

The first supercooling inhibitor is preferably selected appropriately depending on the main ingredient precursor used, that is, it is preferably selected appropriately depending on the main ingredient in the composition to be obtained. When the base agent precursor is sodium acetate anhydride, that is, when the base agent in the resulting composition is sodium acetate trihydrate, the first supercooling inhibitor is preferably sodium pyrophosphate decahydrate. . In embodiment A, the first supercooling inhibitor is preferably sodium tetraborate decahydrate. In aspect B, the first supercooling inhibitor is preferably one or more selected from the group consisting of sodium chloride, barium salt, and strontium salt (eg, strontium chloride hexahydrate).

(2-7. Thickener)
Since a thickener is used in this production method, the resulting composition, ie, the present composition, contains a thickener. As a result, the present composition has the advantage of being in a gel state in an environment at a temperature exceeding the melting temperature of the composition.

A thickener is a substance that can increase the viscosity of a composition, and can also be said to be a substance that can make a composition gel-like. The term "thickener" can also be referred to as "gelling agent". "Thickening agent" and "gelling agent" are interchangeable.

The thickener is not particularly limited as long as it can increase the viscosity of the composition. Examples of thickeners include water-absorbing resins, gelatin, agar, xanthan gum, gum arabic, guar gum, carrageenan, and konjac. Examples of water-absorbing resins include starch-based resins, acrylate-based resins, poval-based resins, carboxymethylcellulose-based resins, and the like. Examples of silica include fumed silica, precipitated silica, and silica gel.

The thickener may be an ionic thickener or a nonionic thickener. The base agent, water-soluble inorganic salt, etc. contained in the composition are often dissolved in the composition and in the form of ions. Therefore, as the thickener, a nonionic thickener is preferable because it does not affect the inorganic ions dissolved in the composition.

Examples of nonionic thickeners include guar gum, dextrin, polyvinylpyrrolidone, and hydroxyethylcellulose. Among nonionic thickeners, hydroxyethyl cellulose is particularly preferred because it has excellent stability in the gel state of the composition and has high environmental compatibility.

Cellulose derivatives can also be suitably used as thickeners. Examples of cellulose derivatives include carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose.

The thickener is at least one member selected from the group consisting of water-absorbing resins, gelatin, agar, xanthan gum, gum arabic, guar gum, carrageenan, konjac, and cellulose derivatives (hereinafter also referred to as group (B)). are preferred, cellulose derivatives are more preferred, and carboxymethyl cellulose and/or hydroxyethyl cellulose are particularly preferred. Compounds belonging to group (B) are thermosetting thickeners. Therefore, when the thickener is at least one selected from the compounds belonging to group (B), especially when it is a cellulose derivative, there is an advantage that the composition can be produced efficiently and stably.

The thickener is preferably selected appropriately depending on the main ingredient precursor used, that is, it is preferably selected appropriately depending on the main ingredient in the resulting composition. In embodiment A, the thickener is preferably carboxymethylcellulose, and in embodiment B, the thickener is preferably hydroxyethylcellulose.

Depending on the concentration of the inorganic salt contained in the composition, precipitation of the inorganic salt may occur over time due to temperature changes. When the composition includes a thickener, the thickener not only (a) enables the composition to gel, but also (b) dissolves the inorganic salts dissolved in the composition (e.g., base ingredients and water-soluble inorganic salts). ions (such as salts) can be efficiently dispersed. Thereby, the thickener can suppress precipitation of inorganic salts in the composition.

The thickener included in the composition does not affect the melting and/or solidification behavior of the composition and allows the composition to maintain a high latent heat of fusion. Furthermore, since the present composition contains a thickener, it has the advantage that the composition remains in a gel state even after a heat cycle test under the environmental temperature at which the composition is expected to be used. Furthermore, since the present composition contains a thickener, the shape of the composition can be kept in a fixed shape even if the composition is in a molten state (gel state). As a result, even if the composition is in a molten state (gel state), there is no risk of polluting the environment, and the environmental load can be reduced.

In one embodiment of the present invention, a mixture whose main components are polyester, an organic solvent that is volatile at room temperature (for example, 15°C to 30°C), and a metal oxide is included in the range of thickeners. do not have. In addition, in order to further increase the flame retardance of the composition, it is preferable that the content of an organic solvent that is volatile at room temperature in the thickener is small; Preferably, it does not substantially contain. Specifically, the content of an organic solvent that is volatile at room temperature in the thickener is preferably 1000 ppm or less. Examples of organic solvents that are volatile at room temperature include monocyclic aromatic compounds, such as benzel, toluene, xylene, ethylenebenzene, cumene, paracymene, dimethyl phthalate, diethyl phthalate, and dipropyl phthalate. It will be done. The total content of monocyclic aromatic compounds in the thickener is preferably 1000 ppm or less. The total content of one or more compounds selected from the group consisting of benzel, toluene, xylene, ethylene benzene, cumene, paracymene, dimethyl phthalate, diethyl phthalate, and dipropyl phthalate in the thickener is 1000 ppm or less It is preferable that

The amount of the thickener used in this production method can be appropriately set depending on the amount of the base ingredient in the resulting composition. The content of the thickener in the present composition is 1 to 10 parts by weight, preferably 2 to 6 parts by weight, based on 100 parts by weight of the base agent. According to this configuration, (i) aggregation and precipitation of the salt dissolved in the composition can be prevented, (ii) the composition has good handling properties, and (iii) the temperature environment exceeds the melting temperature of the composition. Below, the composition has the advantage of being in a gel state.

In the above-mentioned Patent Document 2, long fibrous palygorskite and/or long fibrous sepiolite are used as a phase separation inhibitor having a thickening effect. Here, since the phase separation inhibitor of Patent Document 2 has a thickening effect, it is considered to be a thickening agent in one embodiment of the present invention. Long-fiber palygorskite and/or long-fiber sepiolite are produced in very small amounts in Japan, and can be said to be rare and not widely used substances. In one embodiment of the present invention, the use of readily available materials such as those described above as thickening agents eliminates the use of rare materials such as long-fiber palygorskite and long-fiber sepiolite, resulting in gel-like An inorganic latent heat storage material composition can be obtained.

(2-8. Second supercooling inhibitor)
In this production method, it is preferable to use a second supercooling inhibitor, that is, it is preferable that the present composition contains the second supercooling inhibitor. According to this configuration, a composition with less supercooling can be obtained.

The second supercooling inhibitor is not particularly limited as long as it is a poorly water-soluble inorganic salt and has a function of preventing supercooling of the composition. As the first supercooling inhibitor, it is preferable to use a compound that can prevent supercooling of the composition using a relatively small amount and is easily available.

The second supercooling inhibitor includes, for example, barium sulfate, barium carbonate, lithium fluoride, calcium fluoride, silicon dioxide (silica), kaolinite, cryolite, fly ash, sepiolite, graphite, and carbon black. One or more types selected from the group can be mentioned. Fly ash, graphite and carbon black are also considered herein as sparingly water-soluble inorganic salts. These second supercooling inhibitors may be used alone or in combination of two or more.

The second supercooling inhibitor is preferably selected appropriately depending on the main ingredient precursor used, that is, it is preferably selected appropriately depending on the main ingredient in the composition to be obtained.

(2-9. Phase separation inhibitor)
In this production method, it is preferable to use a phase separation preventing agent, that is, it is preferable that the present composition contains a phase separation preventing agent. According to this configuration, phase separation of the composition in a molten state (gel state) can be prevented. As a result, the gel state of the composition in a molten state (gel state) can be maintained for a long period of time, that is, the stability of the gel state of the composition can be improved.

The phase separation inhibitor is not particularly limited as long as it has the function of preventing phase separation of the composition in a molten state (gel state). The phase separation inhibitor can be appropriately selected based on the main ingredient precursor and/or thickener used, the desired viscosity of the composition, and the like. Examples of phase separation inhibitors include fatty acids, glycerin, vegetable oils, paraffins, and nonionic surfactants having a melting point of 20° C. or lower.

Examples of fatty acids having a melting point of 20° C. or lower include unsaturated fatty acids such as oleic acid, linoleic acid, linolenic acid, ricinoleic acid, and erucic acid. Alternatively, a fatty acid mixture containing 40% by weight or more of the above-mentioned fatty acids may be used. The fatty acid mixture also includes some of the vegetable oils described below.

Preferably, the vegetable oil is one that is liquid at room temperature and has a melting point of 10° C. or lower, such as sunflower oil, corn oil, cottonseed oil, sesame oil, rapeseed oil, peanut oil, olive oil, soybean oil, linseed oil, and castor oil. be able to.

The paraffin is preferably one that is liquid at room temperature and has a melting point of 10° C. or lower, such as liquid paraffin, pentadecane, tetradecane, tridecane, dodecane, undecane, and decane.

The above-mentioned phase separation inhibitors may be used alone or in combination of two or more.

The phase separation inhibitor is preferably at least one selected from the group consisting of fatty acids, glycerin, vegetable oils, paraffins, and nonionic surfactants having a melting point of 20° C. or less. This configuration has the advantage that the phase separation inhibitor can be easily dispersed uniformly in the inorganic latent heat storage material composition.

It is more preferable that the phase separation inhibitor is at least one selected from the group consisting of fatty acids and glycerin having a melting point of 20° C. or lower. According to this configuration, there is an advantage that the phase separation inhibitor can be more easily and uniformly dispersed in the inorganic latent heat storage material composition. Although the reason for this is not certain, it is assumed as follows. Fatty acids have a polar group represented by -COOH, and glycerin has a hydroxyl group (-OH). Therefore, fatty acids and glycerin have a strong affinity for the hydroxyl group of the main ingredient, and as a result, they can be used as phase separation inhibitors and inorganic compounds. It is presumed that it is easily compatible with the latent heat storage material composition. Note that an embodiment of the present invention is not limited by such speculation.

Commercially available products can also be used as the phase separation inhibitor. Commercially available products that can be used as phase separation inhibitors include NAA (registered trademark)-34 (manufactured by NOF Corporation, a mixture containing oleic acid as a main component), NAA (registered trademark) -35 (manufactured by NOF Corporation, a mixture containing oleic acid as a main component), (manufactured by NOF Corporation, a mixture containing oleic acid as a main component), extra olein (manufactured by NOF Corporation, a mixture containing oleic acid as a main component), and Nsp (manufactured by Hope Pharmaceutical Co., Ltd., a fatty acid mixture).

The content of the phase separation inhibitor in the present composition is 0.1 parts by weight to 5.0 parts by weight, and preferably 0.2 parts by weight to 4.0 parts by weight, based on 100 parts by weight of the main agent. The amount is preferably from 0.3 parts by weight to 3.0 parts by weight, and even more preferably from 0.5 parts by weight to 2.0 parts by weight. This configuration has the advantage that phase separation of the composition in a molten state (gel state) can be prevented for a long period of time, and as a result, the gel state of the composition can be maintained for a long period of time.

(2-10. Organic solvent)
In order to further improve the flame retardancy of the composition, it is preferable that the amount of the organic solvent that is volatile at room temperature (for example, 15° C. to 30° C.) used in the present manufacturing method is small. In other words, the content of the organic solvent that is volatile at room temperature (for example, 15° C. to 30° C.) in the present composition is preferably small. Specifically, the content of the organic solvent that is volatile at room temperature in 100 parts by weight of the present composition is preferably 50 parts by weight or less, more preferably 10 parts by weight or less, and 5 parts by weight or less. It is more preferably at most 1 part by weight, more preferably at most 1 part by weight, even more preferably at most 0.5 part by weight, particularly preferably at most 0.1 part by weight. The content of the monocyclic aromatic compound in 100 parts by weight of the present composition is preferably 50 parts by weight or less, more preferably 10 parts by weight or less, more preferably 5 parts by weight or less, It is more preferably 1 part by weight or less, even more preferably 0.5 part by weight or less, particularly preferably 0.1 part by weight or less. Total content of one or more compounds selected from the group consisting of benzel, toluene, xylene, ethylenebenzene, cumene, paracymene, dimethyl phthalate, diethyl phthalate, and dipropyl phthalate in 100 parts by weight of the present composition is preferably 50 parts by weight or less, more preferably 10 parts by weight or less, more preferably 5 parts by weight or less, more preferably 1 part by weight or less, and 0.5 parts by weight. It is more preferably at most 0.1 part by weight, particularly preferably at most 0.1 part by weight.

(2-11. Other ingredients)
In this manufacturing method, other materials other than the main ingredient precursor, water-soluble inorganic salt, poorly water-soluble inorganic salt, thickener, and phase separation inhibitor may be used as necessary, unless the effects of the embodiment of the present invention are impaired. Compounds may also be used. In other words, the present composition may contain a main ingredient precursor, a water-soluble inorganic salt, a slightly water-soluble inorganic salt, a thickener, and a phase separation preventive agent, as necessary, as long as the effects of one embodiment of the present invention are not impaired. It may contain other compounds (sometimes referred to as "other components") other than the agent. These other ingredients include solvents, alcohols, preservatives, fragrances, coloring agents, flame retardants, light stabilizers, ultraviolet absorbers, storage stabilizers, bubble control agents, lubricants, antifungal agents, antibacterial agents, and antibacterial agents. Examples include molecular polymers, other organic compounds, and other inorganic compounds.

As the solvent for the present composition, water is preferred in order to further enhance the flame retardancy of the composition.

Examples of alcohols include lower alcohols (e.g., methanol, ethanol, 2-propanol, ethylene glycol, glycerol, etc.) and higher alcohols (e.g., caprylic alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, linoleic alcohol, etc.). alcohol, etc.). Alcohols may have the function of adjusting the melting temperature and/or solidification temperature of the composition.

(2-12. Inorganic latent heat storage material composition)
The composition obtained by the present production method, that is, the present composition, (i) absorbs thermal energy during the phase transition of the composition from a solidified state (solid) to a molten state (gel state); and (ii) ) It can be suitably used as a latent heat type heat storage material that utilizes the fact that thermal energy is released during phase transition of a composition from a molten state (gel state) to a solidified state (solid state). The "molten state" can also be referred to as the "molten state."

For example, by absorbing thermal energy during a phase transition from a solidified state to a molten state, the present composition can reduce the temperature in a room, for example, to a desired temperature below the ambient temperature, even in a high temperature environment (e.g., summer). can be held. Furthermore, by releasing thermal energy during the phase transition from the molten state to the solidified state, the present composition can reduce the temperature in a room, for example, to a desired temperature above the ambient temperature, even in a low-temperature environment (e.g., winter). can be held. That is, according to the inorganic latent heat storage material composition according to one embodiment of the present invention, the indoor temperature can be adjusted to a desired temperature (for example, 15 to 30 ℃).

(2-12-1. Gel state)
The present composition is preferably in a gel state in an environment at a temperature exceeding the melting temperature of the composition.

In this specification, "the inorganic latent heat storage material composition is in a gel state in a temperature environment exceeding the melting temperature of the inorganic latent heat storage material composition" means the melting temperature of the inorganic latent heat storage material composition. It is intended that the inorganic latent heat storage material composition has a viscosity in the range of 2 Pa·s to 25 Pa·s. The measurement of viscosity in the definition of gel state is the value measured by an oscillating viscometer (also referred to as a tuning fork oscillating rheometer).

In this specification, "the inorganic latent heat storage material composition is in a gel state in a temperature environment exceeding the melting temperature of the inorganic latent heat storage material composition" means (a) the inorganic latent heat storage material composition; It can be said that the inorganic latent heat storage material composition does not undergo solid-liquid separation when heated to a temperature exceeding the melting temperature of the inorganic latent heat storage material composition. (b) The melting temperature of the inorganic latent heat storage material composition It can also be said that the inorganic latent heat storage material composition at a temperature exceeding In this specification, "the inorganic latent heat storage material composition undergoes solid-liquid separation" means, for example, that when the inorganic latent heat storage material composition is placed in a suitable container and left to stand for a certain period of time, the following state occurs. A state in which the solid portion in the inorganic latent heat storage material composition precipitates, the water in the inorganic latent heat storage material composition leaks out as a supernatant, and the solid portion and water are separated. When a composition undergoes solid-liquid separation, the structure of the main ingredient contained in the composition changes, so there is a possibility that heat storage performance will be lost. As described above, the present composition may have the property of remaining in a gel state, that is, not undergoing solid-liquid separation, even under a temperature environment exceeding the melting temperature of the composition. Therefore, the present composition has the advantage that it does not lose its heat storage performance and does not flow even in a temperature environment exceeding the melting temperature of the composition.

Furthermore, even if the composition is repeatedly exposed to a temperature environment exceeding the melting temperature of the composition and a temperature environment below the melting temperature, the composition may exceed the melting temperature of the composition. Preferably, it is in a gel state under a temperature environment. According to this configuration, even if the composition is repeatedly exposed to a temperature environment exceeding the melting temperature and a temperature environment below the melting temperature, the heat storage performance of the resulting composition does not change, that is, the heat storage performance of the composition remains unchanged. The composition has the advantage of being highly durable.

The present composition is preferably in a gel state in a temperature environment of the melting temperature of the composition + 10°C or higher, and more preferably in a gel state in a temperature environment of the melting temperature of the composition + 20°C or higher. Preferably, it is in a gel state in a temperature environment of the melting temperature of the composition + 25 ° C. or higher, more preferably in a gel state in a temperature environment of the melting temperature of the composition + 30 ° C. or higher, It is even more preferable to be in a gel state in a temperature environment of the melting temperature of the composition + 35° C. or higher, and particularly preferably to be a gel state in a temperature environment of the melting temperature of the composition + 40° C. or higher.

Note that there is no particular restriction on the temperature under which the present composition is used. From the viewpoint of an appropriate mixing ratio of the inorganic salt as the main ingredient and the thickener contained in the present composition, the composition is preferably used at a temperature below the melting temperature of the composition +40°C.

In this specification, "the inorganic latent heat storage material composition is in a gel state in a temperature environment of the melting temperature of the inorganic latent heat storage material composition + X°C or higher" means that the inorganic latent heat storage material composition is in a gel state. It is intended that the inorganic latent heat storage material composition having a temperature of +X° C. or higher has a viscosity in the range of 2 Pa·s to 25 Pa·s as measured by an oscillating viscometer. In this specification, "the inorganic latent heat storage material composition is in a gel state in a temperature environment of the melting temperature of the inorganic latent heat storage material composition + X° C." means (a) the inorganic latent heat storage material composition; When a substance is heated to a temperature equal to or higher than the melting temperature of the inorganic latent heat storage material composition + X° C., it can be said that the inorganic latent heat storage material composition does not undergo solid-liquid separation. It can also be said that the inorganic latent heat storage material composition whose melting temperature is equal to or higher than +X° C. is not separated into solid and liquid.

The present composition is preferably in a gel state for a long period of time in an environment at a temperature exceeding the melting temperature of the composition. The present composition is preferably in a gel state in a temperature environment exceeding the melting temperature of the composition after 7 days have elapsed from manufacture, and in a temperature environment exceeding the melting temperature of the composition after 30 days have elapsed from manufacture. Below, the composition is more preferably in a gel state, and after 180 days from production, it is more preferably in a gel state in a temperature environment exceeding the melting temperature of the composition, and after 360 days from production, the composition is in a gel state. It is particularly preferable that the substance be in a gel state in an environment at a temperature exceeding the melting temperature of the substance.

(2-12-2. Viscosity)
The viscosity of the inorganic latent heat storage material composition measured by an oscillating viscometer at the melting temperature of the inorganic latent heat storage material composition +10 ° C. to melting temperature +35 ° C. (hereinafter sometimes referred to as "viscosity of the composition"). ) will be explained. The viscosity of the composition can also be said to be "the viscosity obtained by measuring an inorganic latent heat storage material composition having a melting temperature of +10° C. to +35° C. of the inorganic latent heat storage material composition using an oscillating viscometer." Examples of the vibration viscometer include a tuning fork vibration viscometer and a tuning fork vibration rheometer. The viscosity of the composition is preferably 2 Pa.s to 25 Pa.s, more preferably 5 Pa.s to 25 Pa.s, even more preferably 5 Pa.s to 20 Pa.s, 5 Pa.s It is particularly preferable that the pressure is between 17 Pa·s and 17 Pa·s. According to this configuration, at a melting temperature of +10° C. to +35° C. of the inorganic latent heat storage material composition, the inorganic latent heat storage material composition has the following advantages: (a) it is in a gel state; and (b) the viscosity is low. It has the advantage of being easy to operate because it is not too expensive. Further, according to this configuration, the effect of preventing phase separation (preventing water separation) by the phase separation inhibitor is easily exhibited, so that the obtained composition has an advantage that the stability of the gel state is more excellent.

(2-12-3. Melting temperature)
In the present specification, while the solid inorganic latent heat storage material composition melts and becomes gel-like, the temperature in the middle of the temperature range exhibited by the inorganic latent heat storage material composition is Let it be the "melting temperature" of a substance. "Melting temperature" may also be referred to as "melting point,""phase change temperature," or "phase transition temperature."

The melting temperature of the present composition is not particularly limited. Preferably, the composition has a melting temperature of 15°C to 30°C, more preferably a melting temperature of 17°C to 28°C, even more preferably a melting temperature of 20°C to 25°C. According to this configuration, by suitably applying the resulting composition to a house, the latent heat of the composition can be used to easily make the living environment comfortable.

(2-12-4. Latent heat of fusion)
The present composition preferably has a high latent heat of fusion. The latent heat of fusion of the present composition is preferably 80 J/g or more, more preferably 100 J/g or more, and particularly preferably 120 J/g or more. The amount of latent heat of fusion of the inorganic latent heat storage material composition can be measured using a differential scanning calorimeter. For example, using a differential scanning calorimeter (SII EXSTAR6000 DSC, manufactured by Seiko Instruments), the temperature of the inorganic latent heat storage material composition is varied from -20°C to 50°C at a rate of 3.0°C/min. After raising the temperature to 50°C, the temperature is lowered from 50°C to -20°C at the same rate. From the DSC curve obtained at this time, the amount of latent heat of fusion of the composition can be determined.

[3. Use]
The inorganic latent heat storage material composition according to an embodiment of the present invention can be suitably used in various applications where heat storage performance is required, for example, in building materials such as wall materials, floor materials, ceiling materials, and roof materials.

As another embodiment, the inorganic latent heat storage material composition can also be used as a base material for floor mats.

Examples and comparative examples of the present invention will be described below.

The measurement methods and evaluation methods in Examples and Comparative Examples are as follows.

(How to check the distributed state)
The dispersion state of the thickener, poorly water-soluble inorganic salt, and/or phase separation inhibitor in the mixture, liquid mixture, and/or aqueous solution was confirmed as follows. 1 L of the mixture, mixture and/or aqueous solution was passed from the top to the bottom of the 16 mesh sieve through a 50 mm pore size tube at a flow rate of 1 L/min or less. Thereafter, the presence or absence of solids on the sieve was confirmed. If no solids are present on the sieve (i.e. no solids remain), the used thickener, poorly water-soluble inorganic salt and/or phase separation inhibitor will be dispersed in the mixture, liquid mixture and/or aqueous solution. It was determined that the If solids are present on the sieve (i.e. solids remain), the thickener, poorly water-soluble inorganic salt and/or phase separation inhibitor used will be dispersed in the mixture, liquid mixture and/or aqueous solution. It was determined that it was not.

(viscosity)
The viscosity of the inorganic latent heat storage material compositions obtained in Examples and Comparative Examples at the melting temperature of +10°C to +35°C was measured using a vibration viscometer (tuning fork vibration rheometer). , model: RV-10000A, manufactured by A&D Co., Ltd.).

(melting temperature)
The inorganic latent heat storage material compositions obtained in Examples and Comparative Examples were filled into a 2 ml polypropylene cryovial together with a thermocouple. The cryovial was placed in an ultra-low temperature constant temperature chamber (Cryoporter® CS-75CP, ultra-low temperature aluminum block constant temperature chamber manufactured by Cynics) and heated at 0.5℃/0.5℃ within the temperature range of 0℃ to 50℃. The temperature was increased at a temperature increase rate of 100 min. During this period, in the process of increasing the temperature of the thermostatic oven, the temperature of the heat storage material composition within the thermostatic oven was monitored with a thermocouple, and the obtained results (temperature) were plotted against time to obtain a graph. In the obtained graph, the temperature of the inorganic latent heat storage material composition changed in the following order (1) to (3) compared to the temperature of the constant temperature bath, which rose at a constant rate: (1) constant (2) At a certain temperature (temperature T ₁ ), there was almost no change due to the latent heat of the heat storage material composition, and the temperature was maintained at a constant temperature from temperature T ₁ to a certain temperature (temperature T ₂ ); (3) After the temperature reached _T2 , the increase resumed. The midpoint temperature between temperature T ₁ and temperature T ₂ was defined as the "melting temperature" of the heat storage material composition.

(latent heat of fusion)
The amount of latent heat of fusion of the inorganic latent heat storage material compositions obtained in Examples and Comparative Examples was measured using a differential scanning calorimeter (SII EXSTAR6000 DSC, manufactured by Seiko Instruments Inc.). Specifically, the details are as follows. Using a differential scanning calorimeter, the temperature of (a) the inorganic latent heat storage material composition was raised from -20°C to 50°C at a rate of 3.0°C/min, and then 3.0°C. The temperature was lowered from 50° C. to -20° C. at a rate of /min, and (b) the melting/solidification behavior of the inorganic latent heat storage material composition was analyzed to obtain a DSC curve. The amount of latent heat of fusion of the inorganic latent heat storage material composition was calculated from the area of the melting peak in the obtained DSC curve.

Examples and comparative examples will be described below. In addition, in all Examples and all Comparative Examples other than Comparative Example 1, calcium chloride dihydrate was used as the main ingredient precursor. In all Examples and all Comparative Examples other than Comparative Example 1, calcium chloride dihydrate, which is a main ingredient precursor, forms calcium chloride hexahydrate upon contact with water, and Exotherm occurred due to hydrate formation. Therefore, the inorganic latent heat storage material compositions obtained in all Examples and all Comparative Examples other than Comparative Example 1 contained calcium chloride hexahydrate as the main ingredient. In all Examples and all Comparative Examples other than Comparative Example 1, the obtained inorganic latent heat storage material composition contains calcium chloride hexahydrate as a main ingredient, in other words, calcium chloride dihydrate. The amount of water used was adjusted so that the hydrate formed calcium chloride hexahydrate.

[Example 1]
(Aqueous solution preparation process)
(Mixed liquid preparation process)
In a 50L intensive mixer (manufactured by Nippon Eirich Co., Ltd.), (a) 12.26 kg of water, and (b) 3.5 kg of sodium bromide and bromide, which are (b-1) melting point regulators, were added as a water-soluble inorganic salt. 1.42 kg of potassium, and (b-2) 1.49 kg of sodium chloride and 0.44 kg of strontium chloride hexahydrate, which are the first supercooling inhibitor, were added. Subsequently, the raw materials in the intensive mixer were stirred under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm until all the raw materials were completely dissolved in water and a colorless and transparent liquid mixture was obtained. Through this operation, a mixed solution containing water and a water-soluble inorganic salt was obtained.

(Dispersion process)
It was confirmed using a contact thermometer that the temperature of the obtained liquid mixture was 35°C. Next, 1.1 kg of hydroxyethyl cellulose (manufactured by Daicel FineChem Co., Ltd., HEC SE900) was added as a thickener to the 35° C. mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Through this operation, an aqueous solution containing a water-soluble inorganic salt and a thickener and in which the thickener was dispersed was obtained. By the method described above, it was confirmed that the thickener in the aqueous solution was dispersed. Note that the hydroxyethyl cellulose used in Examples 2 to 6 and Comparative Examples 2 to 5 below is the same as the hydroxyethyl cellulose used in Example 1.

(Main ingredient precursor addition step)
25 kg of calcium chloride dihydrate was added as a main ingredient precursor to the obtained aqueous solution in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater temperature setting of 60°C. Thereafter, stirring was terminated when the indicated value of the thermometer inside the intensive mixer reached 75°C. Through this operation, a gel-like inorganic latent heat storage material composition was obtained. The obtained inorganic latent heat storage material composition had a viscosity of 12.5 Pa·s at 40°C, a melting temperature of 21.2°C, and an amount of latent heat of fusion of 136 J/g. When the gel state of the obtained inorganic latent heat storage material composition was observed, it was found that the inorganic latent heat storage material composition was gel-like throughout and maintained a uniform viscosity. That is, the evaluation result of Example 1 can be said to be "uniform gel-like."
was evaluated using the method described above, and the results are shown in Table 1.

[Example 2]
(Aqueous solution preparation process)
(Mixed liquid preparation process)
A mixed solution containing water and a water-soluble inorganic salt was obtained by the same method as in Example 1.

(Dispersion process)
It was confirmed by a contact thermometer that the temperature of the obtained liquid mixture was 32°C. Next, 1.31 kg of hydroxyethyl cellulose was added as a thickener to the 32° C. mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Next, 0.33 kg of oleic acid (manufactured by NOF Corporation, product name: NAA (registered trademark)-34) was added as a phase separation inhibitor to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 30 seconds under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Through this operation, an aqueous solution containing a water-soluble inorganic salt and a thickener and in which the thickener and phase separation inhibitor were dispersed was obtained. By the method described above, it was confirmed that the thickener and phase separation inhibitor in the aqueous solution were dispersed. The oleic acid used in Examples 3, 4, and 6 and Comparative Examples 1 to 6 below is the same as the oleic acid used in Example 2.

(Main ingredient precursor addition step)
25 kg of calcium chloride dihydrate was added as a main ingredient precursor to the obtained aqueous solution in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater temperature setting of 60°C. Thereafter, stirring was terminated when the indicated value of the thermometer inside the intensive mixer reached 71°C. Through this operation, a gel-like inorganic latent heat storage material composition was obtained. The obtained inorganic latent heat storage material composition had a viscosity of 13.7 Pa·s at 40°C, a melting temperature of 20.8°C, and an amount of latent heat of fusion of 135 J/g. When the gel state of the obtained inorganic latent heat storage material composition was observed, it was found that the inorganic latent heat storage material composition was gel-like throughout and maintained a uniform viscosity. That is, the evaluation result of Example 2 can be said to be "uniform gel-like."

[Example 3]
(Aqueous solution preparation process)
(Mixed liquid preparation process)
A mixed solution containing water and a water-soluble inorganic salt was obtained by the same method as in Example 1.

(Dispersion process)
It was confirmed using a contact thermometer that the temperature of the obtained liquid mixture was 37°C. Next, (a) 1.1 kg of hydroxyethyl cellulose as a thickener, and (b) 0.23 kg of sodium benzoate as a preservative were added to the mixed solution at 37° C. in an intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Then, 0.33 kg of oleic acid was added as a phase separation inhibitor to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 30 seconds under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Through this operation, an aqueous solution containing a water-soluble inorganic salt and a thickener and in which the thickener and phase separation inhibitor were dispersed was obtained. By the method described above, it was confirmed that the thickener and phase separation inhibitor in the aqueous solution were dispersed.

(Main ingredient precursor addition step)
25 kg of calcium chloride dihydrate was added as a main ingredient precursor to the obtained aqueous solution in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater temperature setting of 60°C. Thereafter, stirring was terminated when the indicated value of the thermometer inside the intensive mixer reached 65°C. Through this operation, a gel-like inorganic latent heat storage material composition was obtained. The obtained inorganic latent heat storage material composition had a viscosity of 11.4 Pa·s at 40°C, a melting temperature of 21.8°C, and an amount of latent heat of fusion of 144 J/g. When the gel state of the obtained inorganic latent heat storage material composition was observed, it was found that the inorganic latent heat storage material composition was gel-like throughout and maintained a uniform viscosity. That is, the evaluation result of Example 3 can be said to be "uniform gel-like".

[Example 4]
(Aqueous solution preparation process)
(Mixed liquid preparation process)
A mixed solution containing water and a water-soluble inorganic salt was obtained by the same method as in Example 1.

(Dispersion process)
It was confirmed using a contact thermometer that the temperature of the obtained liquid mixture was 30°C. Next, (a) 1.1 kg of hydroxyethyl cellulose as a thickener, and (b) 0.23 kg of sodium benzoate as a preservative were added to the mixed solution at 30° C. in an intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Next, a dispersion was prepared in which 0.22 kg of barium sulfate as a second supercooling inhibitor was dispersed in 0.33 kg of oleic acid as a phase separation inhibitor. The dispersion was then added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 30 seconds under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Through this operation, an aqueous solution containing a water-soluble inorganic salt and a thickener and in which the thickener and phase separation inhibitor were dispersed was obtained. By the method described above, it was confirmed that the thickener, poorly water-soluble inorganic salt, and phase separation inhibitor in the aqueous solution were dispersed.

(Main ingredient precursor addition step)
25 kg of calcium chloride dihydrate was added as a main ingredient precursor to the obtained aqueous solution in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater temperature setting of 60°C. Thereafter, stirring was terminated when the reading on the thermometer inside the intensive mixer reached 73°C. Through this operation, a gel-like inorganic latent heat storage material composition was obtained. The obtained inorganic latent heat storage material composition had a viscosity of 11.7 Pa·s at 40°C, a melting temperature of 20.6°C, and an amount of latent heat of fusion of 141 J/g. When the gel state of the obtained inorganic latent heat storage material composition was observed, it was found that the inorganic latent heat storage material composition was gel-like throughout and maintained a uniform viscosity. That is, the evaluation result of Example 4 can be said to be "uniform gel-like".

[Example 5]
(Aqueous solution preparation process)
(Mixed liquid preparation process)
A mixed solution containing water and a water-soluble inorganic salt was obtained by the same method as in Example 1.

(Dispersion process)
The same method as in Example 4 was used except that the phase separation inhibitor used was changed from 0.33 kg of oleic acid to 0.33 kg of glycerin. An aqueous solution in which the inhibitor was dispersed was obtained. By the method described above, it was confirmed that the thickener, poorly water-soluble inorganic salt, and phase separation inhibitor in the aqueous solution were dispersed.

(Main ingredient precursor addition step)
25 kg of calcium chloride dihydrate was added as a main ingredient precursor to the obtained aqueous solution in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater temperature setting of 60°C. Thereafter, stirring was terminated when the indicated value of the thermometer inside the intensive mixer reached 68°C. Through this operation, a gel-like inorganic latent heat storage material composition was obtained. The obtained inorganic latent heat storage material composition had a viscosity of 14.6 Pa·s at 40°C, a melting temperature of 20.4°C, and an amount of latent heat of fusion of 137 J/g. When the gel state of the obtained inorganic latent heat storage material composition was observed, it was found that the inorganic latent heat storage material composition was gel-like throughout and maintained a uniform viscosity. That is, the evaluation result of Example 5 can be said to be "uniform gel-like."

[Example 6]
(Aqueous solution preparation process)
To a 50 L intensive mixer were added (a) 12.26 kg of water, (b) 1.1 kg of hydroxyethylcellulose as a thickener, and (c) 0.23 kg of sodium benzoate as a preservative. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Next, a dispersion was prepared in which 0.22 kg of barium sulfate as a second supercooling inhibitor was dispersed in 0.33 kg of oleic acid as a phase separation inhibitor. The dispersion was then added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 30 seconds under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm.

Next, as water-soluble inorganic salts, (a) 3.5 kg of sodium bromide and 1.42 kg of potassium bromide, which are melting point regulators, and (b) 1.5 kg of sodium chloride, which is a first supercooling inhibitor. 49 kg and 0.44 kg of strontium chloride hexahydrate were added into the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 15 minutes under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Through this operation, an aqueous solution containing a water-soluble inorganic salt and a thickener and in which the thickener and phase separation inhibitor were dispersed was obtained. It was confirmed that the water-soluble inorganic salt was dissolved in the obtained aqueous solution, and that the thickener and phase separation inhibitor were dispersed in the aqueous solution by the method described above. Further, it was confirmed using a contact thermometer that the temperature of the obtained aqueous solution was 28° C., and that no gelation had progressed.

(Main ingredient precursor addition step)
25 kg of calcium chloride dihydrate was added as a main ingredient precursor to the obtained aqueous solution in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater temperature setting of 60°C. Thereafter, when the indicated value of the thermometer inside the intensive mixer reached 70°C, stirring was terminated. Through this operation, a gel-like inorganic latent heat storage material composition was obtained. The obtained inorganic latent heat storage material composition had a viscosity of 11.1 Pa·s at 40°C, a melting temperature of 20.5°C, and an amount of latent heat of fusion of 131 J/g. When the gel state of the obtained inorganic latent heat storage material composition was observed, it was found that the inorganic latent heat storage material composition was gel-like throughout and maintained a uniform viscosity. That is, the evaluation result of Example 6 can be said to be "uniform gel-like".

[Comparative example 1]
(a) 100 g of sodium sulfate decahydrate as a main ingredient, (b) 23.2 g of sodium bromide and 5.81 g of sodium chloride as a water-soluble inorganic salt, (b-1) a melting point regulator, and (b- 2) 5.0 g of sodium tetraborate decahydrate as a supercooling inhibitor, (c) 3.0 g of sodium carboxymethyl cellulose (CMC2260 manufactured by Daicel FineChem) as a thickener, and (d) a phase separation inhibitor. 3.0 g of oleic acid was ground and mixed using a mortar. Through this operation, an inorganic latent heat storage material composition was obtained. When the gel state of the obtained inorganic latent heat storage material composition was confirmed, it was found that when compared with the inorganic latent heat storage material compositions obtained in Examples 1 to 5, the inorganic latent heat storage material obtained in Comparative Example 1 Although the composition was gel-like throughout, the viscosity was somewhat non-uniform, the thermal properties were somewhat unstable, and the storage stability was also somewhat poor. In addition, "thermal characteristics are somewhat unstable" means (a) When the melting temperature is measured multiple times by the method described in the above (melting temperature) section, the obtained melting temperature value is ±2°C. If the above-mentioned variations exist, and (b) the amount of latent heat of fusion is measured by re-sampling the sample (inorganic latent heat storage material composition) multiple times each time using the method described in the section (Latent heat of fusion) above. When doing so, the content of the thickener differs depending on the portion sampled from the inorganic latent heat storage material composition, so that the amount of latent heat of fusion obtained varies by ±20 J/g or more and less than 30 J/g; intend. In other words, the evaluation results of Comparative Example 1 can be said to be "slightly non-uniform and slightly unstable."

[Comparative example 2]
A mixed solution containing water and a water-soluble inorganic salt was obtained by the same method as in Example 1.

Next, 25 kg of calcium chloride dihydrate was added as a main ingredient precursor to the obtained mixed liquid in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm and a pan rotation speed of 30 rpm. Thereafter, when the indicated value of the thermometer inside the intensive mixer reached 60° C., stirring was terminated.

The temperature of the resulting mixture was confirmed to be 63°C using a contact thermometer. Thereafter, the lid of the intensive mixer was opened, and the mixture was allowed to cool down to 40° C. or lower. It took more than 3 hours to let it cool. After cooling, the temperature of the mixture was confirmed to be 39° C. using a contact thermometer.

Next, (a) 1.1 kg of hydroxyethyl cellulose as a thickener, and (b) 0.23 kg of sodium benzoate as a preservative were added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Next, a dispersion was prepared in which 0.22 kg of barium sulfate as a second supercooling inhibitor was dispersed in 0.33 kg of oleic acid as a phase separation inhibitor. The dispersion was then added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 30 seconds under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Further, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater set temperature of 60°C. Thereafter, stirring was terminated when the indicated value of the thermometer inside the intensive mixer reached 75°C. Through this operation, an inorganic latent heat storage material composition was obtained.

The manufacturing method of Comparative Example 2 required a cooling step that took more than 3 hours as described above, and also required heating again after adding the thickener. Further, regarding the cooling of the mixture in the manufacturing method of Comparative Example 2, if the temperature of the mixture fell below 20° C. due to the cooling, there was a possibility that the temperature of the mixture would fall below the freezing point of the mixture, and the mixture could solidify. Therefore, it was necessary to cool the mixture carefully so as not to solidify the mixture. Therefore, it can be said that the manufacturing method of Comparative Example 2 was an inefficient method. Furthermore, in Comparative Example 2, the main ingredient precursor was added before adding the thickener. Therefore, in Comparative Example 2, if cooling was not performed, the thickener would not be sufficiently dispersed due to heat generation (reaction heat) due to the addition of the base resin precursor, and the thickener would remain in lumps. However, gelation of the composition proceeded unevenly. Therefore, the evaluation result of Comparative Example 2 can be said to be that "cooling and reheating are required."

[Comparative example 3]
To a 50 L intensive mixer were added (a) 12.26 kg of water, and (b) 25 kg of calcium chloride dihydrate as a main ingredient precursor. Subsequently, the raw materials in the intensive mixer were stirred under the conditions of a rotor rotation speed of 1350 rpm and a pan rotation speed of 30 rpm. Thereafter, when the indicated value of the thermometer inside the intensive mixer reached 60° C., stirring was terminated.

The temperature of the resulting mixture was confirmed to be 63°C using a contact thermometer. Thereafter, the lid of the intensive mixer was opened, and the mixture was allowed to cool down to 40° C. or lower. It took more than 3 hours to let it cool. After cooling, the temperature of the mixed liquid was confirmed to be 39°C using a contact thermometer. Next, (a) 1.1 kg of hydroxyethyl cellulose as a thickener, and (b) 0.23 kg of sodium benzoate as a preservative were added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Next, a dispersion was prepared in which 0.22 kg of barium sulfate as a second supercooling inhibitor was dispersed in 0.33 kg of oleic acid as a phase separation inhibitor. The dispersion was then added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 30 seconds under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm.

Next, in the mixture in the intensive mixer, (a) 3.5 kg of sodium bromide and 1.42 kg of potassium bromide, which are melting point regulators, are added as water-soluble inorganic salts, and (b) a first supercooling prevention agent. 1.49 kg of sodium chloride and 0.44 kg of strontium chloride hexahydrate were added. Subsequently, the mixture in the intensive mixer was stirred for 15 minutes under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Here, it was confirmed that undissolved solids existed in the obtained mixture, and the beginning of gelation of the mixture was confirmed. Next, the mixture in the intensive mixer was stirred at a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater temperature setting of 60°C. Through this operation, an inorganic latent heat storage material composition was obtained.

The manufacturing method of Comparative Example 3 required a cooling step that took more than 3 hours as described above, and also required heating again after adding the thickener. Further, regarding the cooling of the mixture in the manufacturing method of Comparative Example 3, if the temperature of the mixture fell below 20° C. due to cooling, there was a possibility that the temperature of the mixture would fall below the freezing point of the mixture, and the mixture could solidify. Therefore, it was necessary to cool the mixture carefully so as not to solidify the mixture. Therefore, it can be said that the manufacturing method of Comparative Example 3 was an inefficient method. In addition, in Comparative Example 3, when cooling was not performed, the thickener was not sufficiently dispersed due to heat generation (reaction heat) due to the addition of the main ingredient precursor, and the thickener remained in lumps. , gelation of the composition proceeded unevenly. Furthermore, since the solubility of the main agent precursor is high and the main agent precursor accounts for 80% by weight of the entire composition, when the water-soluble inorganic salt is added after the addition of the main agent precursor as in Comparative Example 3, the water-soluble inorganic salt There was a high possibility that the amount of water solvent that could be dissolved would be reduced, resulting in undissolved residue. Therefore, in the inorganic latent heat storage material composition obtained in Comparative Example 3, it is important to check whether the main ingredient precursor and the water-soluble inorganic salt in the inorganic latent heat storage material composition are completely dissolved, and whether the thickener It was not possible to visually confirm whether the poorly water-soluble inorganic salt and the phase separation inhibitor were uniformly dispersed. Therefore, the evaluation results of Comparative Example 3 can be said to be ``(a) cooling required or thickener lumps present, and (b) undissolved portion present''.

[Comparative example 4]
To a 50 L intensive mixer were added (a) 12.26 kg of water, and (b) 25 kg of calcium chloride dihydrate as a main ingredient precursor. Subsequently, the raw materials in the intensive mixer were stirred under the conditions of a rotor rotation speed of 1350 rpm and a pan rotation speed of 30 rpm. Thereafter, when the indicated value of the thermometer inside the intensive mixer reached 60° C., stirring was terminated.

Next, in the mixture in the intensive mixer, (a) 3.5 kg of sodium bromide and 1.42 kg of potassium bromide, which are melting point regulators, are added as water-soluble inorganic salts, and (b) a first supercooling prevention agent. 1.49 kg of sodium chloride and 0.44 kg of strontium chloride hexahydrate were added. Subsequently, the mixture in the intensive mixer was stirred for 15 minutes under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Here, it was confirmed that undissolved solids (water-soluble inorganic salts) were present in the obtained mixture. The mixture was further stirred for a while under the same conditions, but the undissolved solid (water-soluble inorganic salt) did not dissolve. Thereafter, the mixture in the intensive mixer was stirred for 30 minutes or more under the conditions of a rotor rotation speed of 500 rpm, a pan rotation speed of 15 rpm, and a heater temperature setting of 60°C. It was confirmed that the water-soluble inorganic salt was completely dissolved in the resulting mixture.

The temperature of the resulting mixture was confirmed to be 63°C using a contact thermometer. Next, (a) 1.1 kg of hydroxyethyl cellulose as a thickener, and (b) 0.23 kg of sodium benzoate as a preservative were added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Next, a dispersion was prepared in which 0.22 kg of barium sulfate as a second supercooling inhibitor was dispersed in 0.33 kg of oleic acid as a phase separation inhibitor. The dispersion was then added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 30 seconds under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Here, it was confirmed that lumps of thickener were locally generated in the obtained mixture due to the high temperature of the mixture, and that the thickener was not uniformly dispersed. . Next, the mixture in the intensive mixer was stirred at a rotor rotation speed of 1350 rpm, a pan rotation speed of 30 rpm, and a heater temperature setting of 60°C. Through this operation, an inorganic latent heat storage material composition was obtained.

The manufacturing method of Comparative Example 4 required a long time and heating to dissolve the water-soluble inorganic salt, as described above, and was an inefficient method. In Comparative Example 4, the solubility of the main agent precursor is high, and the main agent precursor accounts for 80% by weight of the entire composition. Therefore, when adding a water-soluble inorganic salt after adding the main ingredient precursor as in Comparative Example 4, the water solvent in which the water-soluble inorganic salt can be dissolved is reduced, and there is a possibility that undissolved residue may be formed, as in Comparative Example 3. It was expensive. Therefore, in Comparative Example 4, it was necessary to stir for a long time. In addition, in Comparative Example 4, since a thickener was not included when adding the main ingredient precursor, gelation using the heat generated by the addition of the main ingredient precursor (reaction heat) could not be performed, and it was difficult to manufacture the composition. It took a long time. Furthermore, although the inorganic latent heat storage material composition obtained in Comparative Example 4 was in a gel state, it was confirmed that chunks of the thickener remained in the inorganic latent heat storage material composition, that is, the inorganic latent heat storage material composition was found to be in a gel state. The gel state of the inorganic latent heat storage material composition obtained was not uniform. Therefore, the evaluation result of Comparative Example 4 can be said to be that "long-time stirring is required and thickener lumps are present."

[Comparative example 5]
To a 50 L intensive mixer were added (a) 12.26 kg of water, (b) 1.1 kg of hydroxyethylcellulose as a thickener, and (c) 0.23 kg of sodium benzoate as a preservative. Subsequently, the mixture in the intensive mixer was stirred for 1 minute under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Next, a dispersion was prepared in which 0.22 kg of barium sulfate as a second supercooling inhibitor was dispersed in 0.33 kg of oleic acid as a phase separation inhibitor. The dispersion was then added to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred for 30 seconds under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm.

Next, 25 kg of calcium chloride dihydrate was added as a main ingredient precursor to the mixture in the intensive mixer. Subsequently, the mixture in the intensive mixer was stirred under the conditions of a rotor rotation speed of 1350 rpm and a pan rotation speed of 30 rpm. Thereafter, when the indicated value of the thermometer inside the intensive mixer reached 60° C., stirring was terminated. It was confirmed that the obtained mixture was gel-like due to the high temperature of the obtained mixture.

Next, in the mixture in the intensive mixer, (a) 3.5 kg of sodium bromide and 1.42 kg of potassium bromide, which are melting point regulators, are added as water-soluble inorganic salts, and (b) a first supercooling prevention agent. 1.49 kg of sodium chloride and 0.44 kg of strontium chloride hexahydrate were added. Subsequently, the mixture in the intensive mixer was stirred for 15 minutes under the conditions of a rotor rotation speed of 500 rpm and a pan rotation speed of 15 rpm. Through this operation, an inorganic latent heat storage material composition was obtained.

The inorganic latent heat storage material composition obtained in Comparative Example 5 was in a gel state, but since the mixture before adding the water-soluble inorganic salt was already in a gel state, the water-soluble inorganic salt did not dissolve and became a solid. It was incorporated into the gel as it was. Therefore, the inorganic latent heat storage material composition obtained in Comparative Example 5 had nonuniform inorganic salts and unstable thermal properties. "Thermal properties are unstable" means (a) When the melting temperature is measured multiple times by the method described in the above (melting temperature) section, the obtained melting temperature value is ±2°C or more. (b) The sample (inorganic latent heat storage material composition) was sampled multiple times each time and the latent heat of fusion was measured again using the method described in the section (Latent heat of fusion) above. In this case, it is intended that the amount of latent heat of fusion obtained varies by ±30 J/g or more because the content of the thickener differs depending on the sample sample from the inorganic latent heat storage material composition. intend to. Therefore, the evaluation result of Comparative Example 5 can be said to be "nonuniform and unstable."

As shown in Table 1, the compositions obtained by the manufacturing methods of Examples 1 to 5, ie, the manufacturing method according to one embodiment of the present invention, were "uniformly gel-like." Furthermore, the manufacturing methods of Examples 1 to 5, that is, the manufacturing method according to an embodiment of the present invention, do not require long-term stirring, etc., do not require cooling, and do not require excessive heating. Ta. Therefore, in the manufacturing method of Examples 1 to 5, that is, the manufacturing method according to one embodiment of the present invention, all steps are completed in about 20 minutes, at least within 25 minutes, and the gel-like inorganic latent heat storage material A composition was obtained. Therefore, it can be seen that the manufacturing methods of Examples 1 to 5, ie, the manufacturing method according to one embodiment of the present invention, can efficiently provide a gel-like inorganic latent heat storage material composition.

As shown in Table 2, the manufacturing methods of Comparative Examples 1 to 6, that is, the manufacturing methods outside the scope of the present invention, were inefficient, and the compositions obtained by the manufacturing methods were of inferior quality. .

The method for producing an inorganic latent heat storage material composition according to an embodiment of the present invention can efficiently provide a gel-like inorganic latent heat storage material composition. The inorganic latent heat storage material composition obtained by the method for producing an inorganic latent heat storage material composition according to an embodiment of the present invention can be used as a heat storage material, for example, for wall materials, floor materials, ceiling materials, roofing materials, and floor mats. It can be suitably used as a base material, etc.

Claims (6)

A method for producing an inorganic latent heat storage material composition, comprising:
a base ingredient precursor addition step of adding the base ingredient precursor into an aqueous solution containing a water-soluble inorganic salt and a thickener;
The inorganic latent heat storage material composition includes 100 parts by weight of the main agent, 1 to 10 parts by weight of the thickener, and the water-soluble inorganic salt,
The method for producing an inorganic latent heat storage material composition , wherein the thickener is a cellulose derivative . Further comprising an aqueous solution preparation step of preparing the aqueous solution before the main ingredient precursor addition step,
The aqueous solution preparation step includes a dispersion step of dispersing (a) the thickener, and (b) a poorly water-soluble inorganic salt and/or a phase separation inhibitor in a mixed solution containing water and the water-soluble inorganic salt. ,
The inorganic latent heat storage material composition further includes the poorly water-soluble inorganic salt and/or the phase separation inhibitor,
The method for producing an inorganic latent heat storage material composition according to claim 1, wherein the amount of the phase separation inhibitor is 1 part by weight to 10 parts by weight based on 100 parts by weight of the main agent. The base agent precursor is at least one selected from the group consisting of anhydrous sodium acetate, anhydrous sodium sulfate, anhydrous calcium chloride, anhydrous calcium chloride, anhydrous disodium hydrogen phosphate, and anhydrous sodium carbonate. The method for producing an inorganic latent heat storage material composition according to claim 1 or 2 . 4. The phase separation inhibitor according to claim 2 or 3, wherein the phase separation inhibitor is at least one selected from the group consisting of fatty acids, glycerin, vegetable oils, paraffins, and nonionic surfactants having a melting point of 20° C. or less. A method for producing an inorganic latent heat storage material composition. Claim 1, wherein the inorganic latent heat storage material composition has a viscosity of 2 to 25 Pa·s when measured with an oscillating viscometer at a melting temperature of +10° C. to +35° C. of the inorganic latent heat storage material composition. A method for producing an inorganic latent heat storage material composition according to any one of items 1 to 4 . The method for producing an inorganic latent heat storage material composition according to any one of claims 1 to 5 , wherein the inorganic latent heat storage material composition has a melting temperature of 15°C to 30°C.