Cold and heat storage agent composition

Abstract

The present invention provides a cold and heat storage agent composition, which is not classified as GHS. A cold and heat storage agent composition, which contains (A) a dialkyl ether and (B) a normal paraffin, wherein (A) contains a dialkyl ether having a straight-chain alkyl group, and (B) contains a normal paraffin having 16 to 20 carbon atoms, and the content of the normal paraffin having 16 to 20 carbon atoms is 3.0 mass% or more and less than 10.0 mass% based on the total mass of the composition, and the melting point and freezing point of the composition measured by DSC are in the range of -13.0°C to +12.4°C.

Description

Technical Field

[0001] The invention relates to a cold-heat storage agent composition for a refrigeration cycle device. Background Art

[0002] Vehicles with an idling stop function that automatically stops the engine when the vehicle stops, such as when waiting for a traffic light, are now being put into practical use. Such vehicles are equipped with a cold storage type vehicle air conditioner that can store cold in a cold storage device when the compressor is operating and cool the air blown from the cooler into the vehicle cabin when the compressor is stopped.

[0003] In the above-mentioned vehicle air conditioning device, a heat storage agent or heat storage agent composition is used. Since water-based heat storage agents or heat storage agent compositions have the problem of corrosion and corruption, heat storage agents or heat storage agent compositions using normal paraffin as a base agent instead of water have been developed (for example, Patent Document 1). Normal paraffin exhibits long-term stable melting and solidification characteristics and has the advantage of large latent heat.

[0004] However, n-paraffins are classified as Category 1, which is the most harmful of the five stages of harmfulness of suction respirators based on GHS (Globally Harmonized System of Classification and Labeling of Chemicals). Among n-paraffins, n-dodecane (n-C12) has a flash point below 93°C, so it is classified as a flammable liquid in the GHS category. In order not to fall into the category classified by GHS, the content of n-paraffins in the cold-heat storage agent or the cold-heat storage agent composition needs to be less than 10% by mass. Furthermore, n-tetradecane (n-C14) is classified as a volatile organic compound (VOC: volatile organic compounds) which is a voluntary restricted substance of the Automobile Industry Association, so there is a tendency to control the use of n-C14.

[0005] As a base of the heat storage material, for example, the use of dialkyl ethers is disclosed in Patent Documents 2 and 3. Patent Document 2 discloses a combination of at least one selected from the group consisting of fatty acid esters, aliphatic ketones, fatty acid alcohols, and aliphatic ethers and a fatty acid metal salt. Patent Document 3 discloses microcapsules containing a compound containing a heteroelement as a heat storage material.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2013-166845

[0009] Patent Document 2: Japanese Patent Application Publication No. 2015-54918

[0010] Patent Document 3: International Publication No. 2007 / 058003 Summary of the invention

[0011] Problems to be solved by the invention

[0012] The object of the present invention is to provide a cold-heat storage agent composition which does not belong to the GHS category.

[0013] Another object of the present invention is to provide an aluminum refrigeration cycle device enclosing the cold-heat storage agent composition of the present invention.

[0014] Methods for solving problems

[0015] The present inventors have conducted intensive research to achieve the above-mentioned purpose, and as a result, have found a cold-heat storage agent composition that does not belong to the GHS category by combining a specific dialkyl ether with a specific normal paraffin. That is, according to the present invention, there are provided the following cold-heat storage agent composition and an aluminum refrigeration cycle device enclosing the cold-heat storage agent composition.

[0016] 1. A cold and heat storage agent composition comprising (A) a dialkyl ether and (B) a normal paraffin,

[0017] (A) contains a dialkyl ether having a linear alkyl group,

[0018] (B) contains normal paraffins having 16 to 20 carbon atoms, wherein the content of normal paraffins having 16 to 20 carbon atoms is 3.0% by mass or more and less than 10.0% by mass based on the total mass of the composition,

[0019] The melting point and freezing point of the composition measured by DSC were in the range of -13.0°C to +12.4°C.

[0020] 2. The cold-heat storage agent composition according to item 1 above, wherein the latent heat of fusion per unit volume is 125 KJ / L or more.

[0021] 3. The cold-heat storage agent composition according to 1 or 2 above, which has a flash point of 93° C. or higher.

[0022] 4. The cold / heat storage agent composition according to any one of 1 to 3 above, wherein (A) contains a dialkyl ether having two linear alkyl groups having 6 to 12 carbon atoms.

[0023] 5. The cold / heat storage agent composition according to any one of 1 to 4 above, wherein (A) is a dialkyl ether having two linear alkyl groups having 8 to 10 carbon atoms.

[0024] 6. The cold-heat storage agent composition according to any one of 1 to 5 above, further comprising (C) a hydrogen generation inhibitor.

[0025] 7. The cold-heat storage agent composition according to 6 above, wherein (C) is at least one selected from the group consisting of amine salts, sulfonates, phosphates, and mixtures thereof.

[0026] 8. The cold / heat storage agent composition according to any one of 1 to 7 above, further comprising (D) an antioxidant.

[0027] 9. The cold / heat storage agent composition according to any one of 1 to 8 above, further comprising (E) at least one thickener selected from the group consisting of urea compounds, carbamate compounds, carbon black, bentonite, and fumed silica.

[0028] 10. An aluminum refrigeration cycle device enclosed with the cold-heat storage agent composition according to any one of 1 to 9 above.

[0029] Effects of the Invention

[0030] According to the present invention, a cold-heat storage agent composition that does not belong to the GHS category can be provided. DETAILED DESCRIPTION

[0031] [Base]

[0032] The above-mentioned components (A) and (B) are bases of the cold-heat storage agent composition of the present invention.

[0033] Component (A) contains a dialkyl ether having a straight-chain alkyl group. Preferably, it contains a dialkyl ether having two straight-chain alkyl groups with a carbon number of 6 to 12. More preferably, it is at least one selected from the group consisting of dialkyl ethers having two straight-chain alkyl groups with a carbon number of 8 to 10. The dialkyl ethers may be used alone or in appropriate combinations of two or more. Based on the total mass of the composition, the proportion of (A) dialkyl ether is preferably 60% by mass or more, more preferably 70% by mass or more, and particularly preferably 80% by mass or more. By containing it in such an amount, sufficient solid-liquid latent heat can be obtained, so it is preferred.

[0034] The (B) component contains normal paraffins having 16 to 20 carbon atoms, and the content of normal paraffins having 16 to 20 carbon atoms is 3.0% by mass or more and less than 10.0% by mass based on the total mass of the composition. If it is 10% by mass or more, it belongs to category 1 based on the GHS classification, so there are concerns about safety to the human body. If it is less than 3.0% by mass, the melting point becomes above +12.4°C, so the blown air blown from the cooler into the vehicle interior cannot be fully cooled, and it is not suitable as a heat storage agent. It is preferably 5.0 to 9.5% by mass. The (B) component is preferably composed only of normal paraffins having 16 to 20 carbon atoms, and more preferably composed only of normal paraffins having 16 to 18 carbon atoms. The (B) component can be used alone or in appropriate combinations of two or more.

[0035] Most preferably, (A) is at least one selected from the group consisting of dialkyl ethers having two straight-chain alkyl groups having 8 or 10 carbon atoms, and (B) is only a normal paraffin having 16 or 17 carbon atoms; or (A) is a dialkyl ether having two straight-chain alkyl groups having 8 carbon atoms, and (B) is only a normal paraffin having 16 or 17 carbon atoms; or (A) is a dialkyl ether having two straight-chain alkyl groups having 10 carbon atoms, and (B) is only a normal paraffin having 16 or 17 carbon atoms.

[0036] The melting point and freezing point of the composition of the present invention measured by DSC are in the range of -13.0°C to +12.4°C. Within this range, the cold storage heat agent composition of the present invention can be used. Two temperature ranges of -13.0°C to -3.0°C and +3.0°C to +12.4°C are preferred. The two temperature ranges are assumed temperature ranges of two different cooling cycle devices, and if the temperature ranges are deviated, sufficient cold storage performance may not be obtained.

[0037] The cold and heat storage agent is placed in a container and managed by volume, so the performance is evaluated by the latent heat per unit volume (KJ / L) obtained by multiplying the latent heat per unit weight (J / g) by the density. The latent heat of melting of the normal paraffin with a carbon number of 15 currently used as a cold and heat storage agent is 125KJ / L, but the latent heat of melting per unit volume of the composition of the present invention is at least 125KJ / L. The latent heat of melting of the composition of the present invention is preferably 130KJ / L or more, and more preferably 140KJ / L or more. In this way, the composition of the present invention can have an exceptionally high latent heat of melting compared to conventional cold and heat storage agents.

[0038] The flash point of the composition of the present invention may be 93° C. or higher when measured by Cleveland open type specified in JIS K22265.4. The flash point is 93° C. or higher, so the composition does not belong to the category of flammable liquids classified by GHS. The flash point of the composition of the present invention is preferably 130° C. or higher, and more preferably 140° C. or higher.

[0039] The acid value of the composition of the present invention may be 2.0 or less when measured by the method specified in JIS K2501.5. By making the acid value 2.0 or less, the generation of hydrogen caused by the deterioration and decomposition of the composition can be suppressed. The acid value of the composition of the present invention is preferably 1.7 or less, or more preferably 1.5 or less.

[0040] The refrigerant or the cold-heat storage agent is usually sealed in an aluminum refrigeration cycle device for use. Aluminum ions are sometimes generated due to the contact between the refrigerant or the cold-heat storage agent and the refrigeration cycle device. If the concentration of the generated aluminum ions increases, rust is generated in the refrigeration cycle device, or hydrogen is generated to deform the refrigeration cycle device.

[0041] Assuming that the cold-heat storage agent composition of the present invention is sealed in an aluminum refrigeration cycle device, if an aluminum sheet of a specified size is placed in a sample bottle containing distilled water equal to the composition of the present invention, and the aluminum sheet does not change color after being left to stand under specified conditions, the Al ion concentration of the water layer is usually 1.00 ppm or less. Preferably, it is 0.5 ppm or less, and more preferably, it is 0.11 ppm or less. In this way, rust of the aluminum refrigeration cycle device and deformation of the aluminum refrigeration cycle device caused by hydrogen generation can be prevented.

[0042] The evaporation loss of the composition of the present invention after 72 hours at 50°C is usually 15% by mass or less, preferably 10% by mass or less. If the evaporation loss increases, the possibility of deformation of the aluminum housing increases, so it is preferred that the evaporation loss is small. It should be noted that 50°C is a temperature at which the composition of the present invention is assumed to be used around a car air conditioner in midsummer.

[0043] [(C) Hydrogen generation inhibitor]

[0044] The cold and heat storage agent composition of the present invention may also contain a hydrogen generation inhibitor. The hydrogen generation inhibitor that can be used in the present invention is preferably at least one selected from the group consisting of amine salts, sulfonates, phosphates and mixtures thereof. These compounds are usually used as organic inhibitors (oil-soluble rust inhibitors) or passivators.

[0045] Examples of the amine salt include fatty acid amine salts, aromatic carboxylic acid amine salts, phosphate amine salts, etc. Fatty acid amine salts are preferred.

[0046] As the fatty acid constituting the above-mentioned fatty acid amine salt, preferably a fatty acid having 4 to 22 carbon atoms can be mentioned, and more preferably a fatty acid having 8 to 18 carbon atoms can be mentioned. The fatty acid can be a saturated fatty acid or an unsaturated fatty acid, and can also be a straight-chain fatty acid, a branched fatty acid, a cyclic fatty acid, or a hydroxy fatty acid. Specifically, stearic acid, palmitic acid, myristic acid, lauric acid, isostearic acid, caprylic acid, undecylenic acid, oleic acid, hydroxystearic acid, etc. can be mentioned. Among them, caprylic acid and oleic acid are preferred.

[0047] The amine constituting the fatty acid amine salt is not particularly limited, and preferably saturated or unsaturated amines having 1 to 42 carbon atoms are used, and more preferably saturated or unsaturated amines having 4 to 22 carbon atoms are used. Specifically, octylamine, laurylamine, myristicamine, stearylamine, behenylamine, oleylamine, tallow alkylamine, cured tallow alkylamine, aniline, benzylamine, cyclohexylamine, diethylamine, dipropylamine, dibutylamine, diphenylamine, dibenzylamine, dicyclohexylamine, triethylamine, tributylamine, dimethyloctylamine, dimethyldecylamine, dimethylstearylamine, dimethyl tallow alkylamine, dimethyl cured tallow alkylamine, and dimethyloleylamine are used. Among them, cured tallow alkylamine and tributylamine are preferred.

[0048] The above-mentioned fatty acid amine salts may be used alone or in combination of two or more thereof. Particularly preferred are fatty acid amine salts obtained from octanoic acid and tributylamine, fatty acid amine salts obtained from oleic acid and solidified tallow alkylamine, or mixtures thereof.

[0049] Examples of the aromatic carboxylic acid amine salt include ammonium benzoate and the like.

[0050] Specifically, preferred examples of the amine constituting the amine phosphoric acid salt include tertiary alkylamines and aromatic amines.

[0051] As the sulfonic acid component of the above-mentioned sulfonate, for example, petroleum sulfonic acid, alkylnaphthalene sulfonic acid, alkylbenzene sulfonic acid, etc. can be mentioned, and it is composed of their amine salts, metal salts, etc. Preferred metal salts. As amine salts, ammonium salts, diethylenetriamine salts, ethylenediamine salts, etc. can be mentioned. As metal salts, for example, calcium salts, magnesium salts, sodium salts, potassium salts, lithium salts, zinc salts, etc. can be mentioned. Preferred salts are calcium salts, sodium salts, and zinc salts. Zinc salts are particularly preferred. The above-mentioned sulfonates can be used alone or in appropriate combinations of two or more.

[0052] Examples of the phosphoric acid ester constituting the phosphoric acid ester amine salt include acidic phosphoric acid esters and orthophosphates, and acidic phosphoric acid esters are preferred.

[0053] Specific examples of the acidic phosphate include methyl acid phosphate, butyl acid phosphate, dibutyl acid phosphate, monobutyl acid phosphate, 2-ethylhexyl acid phosphate, isodecyl acid phosphate, and monoisodecyl acid phosphate.

[0054] Specific examples of orthophosphates include trimethyl phosphate, triethyl phosphate, tributyl phosphate, tri(2-ethylhexyl) phosphate, triphenyl phosphate, tricresyl phosphate, tricresyl phosphate, tricresyl diphenyl phosphate, 2-ethylhexyl diphenyl phosphate, etc. The above-mentioned phosphate amine salts may be used alone or in appropriate combinations of two or more.

[0055] As the hydrogen generation inhibitor, a combination of a fatty acid amine salt and a phosphoric acid ester or a combination of a sulfonic acid metal salt and a phosphoric acid ester is preferred. A combination of a fatty acid amine salt and a phosphoric acid ester is particularly preferred. Among them, the fatty acid amine salt is preferably a salt of a fatty acid having 4 to 22 carbon atoms and a saturated or unsaturated amine having 1 to 42 carbon atoms, a fatty acid amine salt obtained from octanoic acid and tributylamine, a fatty acid amine salt obtained from oleic acid and solidified tallow alkylamine, or a mixture thereof, and the phosphoric acid ester is preferably an acid phosphate ester selected from the group consisting of methyl acid phosphate, butyl acid phosphate, dibutyl phosphate, monobutyl phosphate, 2-ethylhexyl acid phosphate, isodecyl acid phosphate, and monoisodecyl phosphate.

[0056] The ratio (mass ratio) of the fatty acid amine salt to the phosphoric acid ester is preferably 10:90 to 90:10, more preferably 25:75 to 75:25, and further preferably 40:60 to 60:40.

[0057] The hydrogen generation inhibitor is preferably contained in an amount that does not affect the latent heat of fusion of the base. Specifically, based on the total mass of the composition, the total amount of the hydrogen generation inhibitor is preferably 0.01% to 10.0% by mass, more preferably 0.05% to 5.0% by mass, further preferably 0.1% to 3.0% by mass, and further preferably 0.1% to 1.0% by mass.

[0058] [additive]

[0059] The cold-heat storage agent composition of the present invention may contain additives commonly used in cold-heat storage agents to such an extent that the latent heat of fusion of the base is not affected. Specific examples thereof include antioxidants.

[0060] As the antioxidant, a phenolic antioxidant and an amine antioxidant are preferred, and a phenolic antioxidant is more preferred.

[0061] Examples of the phenolic antioxidant include 2,6-di-tert-butyl-p-cresol (BHT), 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 4,4'-butylenebis(3-methyl-6-tert-butylphenol), 2,6-di-tert-butyl-phenol, 2,4-dimethyl-6-tert-butylphenol, tert-butylhydroxyanisole (BHA), 4,4'-butylenebis(3-methyl-6-tert-butylphenol), 4,4'-methylenebis(2,3-di-tert-butylphenol), and 4,4'-thiobis(3-methyl-6-tert-butylphenol). Among them, 2,6-di-tert-butylphenol is preferred.

[0062] As amine antioxidants, N-n-butyl-p-aminophenol, alkyl diphenylamine, α-naphthylamine, N-phenyl-α-naphthylamine, and phenothiazine can be cited. Among them, alkyl diphenylamine is preferred, and dioctyl diphenylamine is particularly preferred. The above antioxidants can be used alone or in combination of two or more.

[0063] The total amount of the antioxidant added may be such that the latent heat of fusion of the base is not affected, and is preferably 0.01% to 10% by mass, more preferably 0.05% to 5% by mass, and even more preferably 0.1% to 0.9% by mass, based on the total mass of the composition.

[0064] [(E) Thickener]

[0065] The heat storage agent composition of the present invention may contain a thickener to form a grease. Examples of the thickener that can be used in the present invention include at least one selected from the group consisting of urea compounds, carbamate compounds, carbon black, bentonite and fumed silica.

[0066] Examples of the urea compound include diurea compounds that can be represented by the following formula (1).

[0067] R1-NHCONH-R2-NHCONH-R3 (1)

[0068] (In the formula, R1 and R3 may be the same or different, and each represents a hydrocarbon residue having 4 to 20 carbon atoms, such as an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, or an aromatic hydrocarbon group.)

[0069] The diurea compound can be obtained, for example, by reacting an aromatic amine, an aliphatic amine, an alicyclic amine, or a mixture of two or more thereof with an aromatic diisocyanate in a base oil.

[0070] As specific examples of aromatic diisocyanates, toluene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, etc. can be cited. As specific examples of aromatic amines, p-toluidine, aniline, naphthylamine, etc. can be cited. As specific examples of aliphatic amines, octylamine, nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecanylamine, octadecylamine, nonadecanylamine, eicosylamine, etc. can be cited. As specific examples of alicyclic amines, cyclohexylamine, etc. can be cited. Among them, diurea compounds (aliphatic diurea compounds, alicyclic diurea compounds or alicyclic aliphatic diurea compounds) obtained from aromatic diisocyanates and aliphatic amines, alicyclic amines or mixtures thereof are preferred. It is particularly preferred that the aromatic diisocyanate is diphenylmethane diisocyanate, aliphatic amines, alicyclic amines or mixtures thereof are octadecylamine, cyclohexylamine or urea compounds of their mixtures.

[0071] The urethane compound is obtained by reacting the above-mentioned diisocyanate with a monohydric alcohol having 4 to 20 carbon atoms in a base oil.

[0072] As fumed silica, it is desirable that the average particle size of the primary particles is preferably 0.1 μm or less, and more preferably 0.05 μm or less. Compounds whose ends are hydrophobized to dimethyl, trimethyl, octyl dimethyl polysiloxane or the like are preferred. The thickener is characterized in that it is preferably added by grinding treatment at 80°C or less. In the case where the flash point of the base is low, if a reaction process or heating at 80°C or above is performed, the process is more dangerous.

[0073] From the viewpoint of not affecting the latent heat of fusion of the base, carbon black and fumed silica that can grease the base in a small amount are preferred, and from the viewpoint of aluminum resistance, a thickener selected from the group consisting of carbon black and hydrophobized fumed silica is preferred.

[0074] The content of the thickener may be such an amount that the mixed consistency of the grease is about 200 to 400, and is usually 1 to 30% by mass, preferably 3 to 20% by mass.

[0075] [Example]

[0076] <Preparation of Cold-Heat Storage Agent Composition>

[0077] The cold and heat storage agent compositions of the embodiments and comparative examples were prepared as follows: the substances shown in Tables 1 to 3 (in the tables, the values ​​for (A) to (E) are mass % based on the total mass of the composition) were placed in a beaker, heated to 50° C., stirred, and after confirming that they were dissolved, naturally cooled to room temperature.

[0078] The greased composition was prepared by adding a thickener to the naturally cooled cold and heat storage agent composition using a three-stage roll at room temperature.

[0079] The obtained cold-heat storage agent composition was tested by the following method. The results are collectively described in Tables 1 to 3.

[0080] <Test method>

[0081] ○ Melting point, freezing point and latent heat

[0082] The melting point, freezing point and latent heat of the cold and heat storage agent composition are measured using a differential scanning calorimeter (DSC: DSCQ2000 manufactured by TA Instruments). The measurement is carried out by the following method: about 5 mg of the sample is cooled to -30°C or -20°C at a rate of 5°C / min, and the temperature is raised to 40°C at a rate of 5°C / min. The extrapolated melting start temperature of the melting peak is taken as the melting point, and the extrapolated crystallization start temperature of the initial crystallization peak is taken as the freezing point. The latent heat per unit weight (solid-liquid latent heat J / g) is calculated from the area of ​​the melting peak, and the heat per unit volume is calculated by multiplying it by the density. The latent heat used depends on the volume in the container, so the latent heat per unit volume (solid-liquid latent heat KJ / L) is calculated.

[0083] ○Density g / cm 3 (15℃)

[0084] In accordance with JIS K2249.

[0085] ○Flash point(℃)

[0086] In accordance with JIS K22265.4 (Cleveland Open Type (abbreviated as "COC")).

[0087] ○Acid value mgKOH / g

[0088] In accordance with JIS K2501.5.

[0089] ○Al ion concentration

[0090] (1) 8.5 ml of the cold / heat storage agent composition of the examples and comparative examples were placed in a sample bottle.

[0091] (2) Next, place a 40×12 mm aluminum sheet into the sample bottle.

[0092] (3) Finally, 8.5 ml of distilled water was added to the sample bottle (cold and heat storage agent: distilled water = 1:1 (volume ratio)). After adding to the distilled water and letting it stand, it separated into two layers due to insolubility and specific gravity (when no thickener was added, the lower layer was distilled water and the upper layer was the cold and heat storage agent composition).

[0093] (4) Close the lid of the sample bottle and place it in a constant temperature bath at 90°C for 72 hours. Visually observe whether there is rust on the surface of the aluminum sheet. No rust is acceptable. Collect the water layer with a syringe and measure the concentration of aluminum ions dissolved into pure water by ICP analysis. ICP analysis is based on JIS K0116 General Rules for Luminescence Analysis.

[0094] ○Evaporation loss

[0095] About 50 g of the heat storage agent composition was added to a 100 ml beaker and weighed. After standing in a constant temperature bath at 50°C for 72 hours, the weight loss was weighed and the weight loss was divided by the weight before the test and expressed as 100 as the evaporation loss.

[0096] ○60 times without mixing the consistency

[0097] According to JIS K2220 7.

[0098] [Table 1]

[0099]

[0100] [Table 2]

[0101]

[0102] [Table 3]

[0103]

[0104] Fatty acid amine salt: a mixture of tributylamine octanoate and oleic acid hardened tallow alkylamine (mainly C18) salt

[0105] Phosphate esters: acid phosphate esters, isodecyl acid phosphate

Claims

1. A cold and heat storage agent composition comprising (A) a dialkyl ether and (B) a normal paraffin, (A) is one of dialkyl ethers having a linear alkyl group, (B) is one of normal paraffins having 16 to 20 carbon atoms, and the content of the normal paraffin having 16 to 20 carbon atoms is 3.0% by mass or more and less than 10.0% by mass based on the total mass of the composition, The melting point and freezing point of the composition measured by DSC were in the range of -13.0°C to +12.4°C.

2. The cold-heat storage agent composition according to claim 1, in, The latent heat of fusion per unit volume is 125 kJ / L or more.

3. The cold-heat storage agent composition according to claim 1 or 2, which has a flash point of 93°C or higher.

4. The cold-heat storage agent composition according to claim 1 or 2, in, (A) A dialkyl ether containing two linear alkyl groups having 6 to 12 carbon atoms.

5. The cold-heat storage agent composition according to claim 1 or 2, in, (A) is a dialkyl ether having two linear alkyl groups having 8 to 10 carbon atoms.

6. The cold-heat storage agent composition according to claim 1 or 2, in, It further contains (C) a hydrogen generation inhibitor.

7. The cold-heat storage agent composition according to claim 6, in, (C) is at least one selected from the group consisting of amine salts, sulfonates, phosphates, and mixtures thereof.

8. The cold-heat storage agent composition according to claim 1 or 2, in, It also contains (D) antioxidants.

9. The cold-heat storage agent composition according to claim 1 or 2, in, The invention further contains (E) at least one thickener selected from the group consisting of urea compounds, urethane compounds, carbon black, bentonite and fumed silica.

10. An aluminum refrigeration cycle device enclosing the cold-heat storage agent composition according to any one of claims 1 to 9.

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