Thermal medium composition, circulating thermostatic apparatus, and method for producing thermal medium composition

Abstract

To provide a thermal medium composition having high transparency and high water separation performance, a method for producing the same, and a circulating thermostatic apparatus.SOLUTION: According to a first embodiment, a thermal medium composition is provided. The thermal medium composition comprises: a low molecular ester compound with a melting point of -15°C or less and a boiling point of 150°C or greater; and a polysiloxane having a phenyl group. According to a second embodiment, there is provided a circulating thermostatic apparatus. The circulating thermostatic apparatus includes a container that contains the thermal medium composition according to another embodiment.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a cooling / heating medium composition, a circulating thermostatic device, and a method for producing the cooling / heating medium composition. [Background technology]

[0002] 2. Description of the Related Art There is known a circulating thermostatic device that maintains a controlled object, such as various devices or processes, at a preset temperature by circulating a circulating fluid whose liquid temperature is controlled through the controlled object.

[0003] The circulating liquid may be, for example, water, alcohol, glycols, a fluorine-based inert liquid, etc. The fluorine-based inert liquid is particularly suitable because it is a non-flammable liquid.

[0004] However, as a way to deal with global warming, which is a global-scale environmental destruction problem, interest is growing in cooling and heating fluids with extremely low global warming potential. In particular, perfluoroalkyl substances (PFAS) have a high global warming potential, so candidate compounds that can serve as replacements for them are being sought. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-55592 A [Patent Document 2] Patent No. 6237942 [Patent Document 3] Patent No. 4602140 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a cooling / heating medium composition having high transparency and water separation properties, a method for producing the same, and a circulating thermostatic device. [Means for solving the problem]

[0007] According to an embodiment, a cooling / heating medium composition is provided. The cooling / heating medium composition includes a low molecular weight ester compound having a melting point of −15° C. or less and a boiling point of 150° C. or more, and a polysiloxane having a phenyl group.

[0008] According to an embodiment, a circulating thermostatic apparatus is provided. The circulating thermostatic apparatus includes a container that contains a cooling / heating medium composition according to another embodiment.

[0009] According to an embodiment, there is provided a method for producing a cooling / heating medium composition according to another embodiment, which includes heating a mixture of a low molecular weight ester compound and a polysiloxane having a phenyl group at a temperature of 60° C. or higher and 120° C. or lower. Effect of the Invention

[0010] According to the present invention, there are provided a cooling / heating medium composition having high transparency and water separation properties, a method for producing the same, and a circulating thermostatic device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The cooling medium used as the circulating fluid is required to meet various requirements, such as electrical conductivity, insulation, availability, safety, low viscosity, and high specific gravity. Here, the circulating device for the cooling medium is classified into a closed system circulating device in which the flow path of the cooling medium is sealed, and an open system circulating device in which the circulating fluid is stored in a tank that contacts the outside. The cooling medium for the open system circulating device is also required to have a high boiling point. A low molecular weight ester compound having a melting point of -15°C or less and a boiling point of 150°C or more is a stable liquid compound in the range of more than -15°C and less than 150°C, and can meet these requirements.

[0012] On the other hand, the circulating fluid for an analytical device may be required to have high transparency and separability from water. That is, if water is mixed into the circulating fluid due to condensation or the like, it becomes difficult to remove the water from the circulating fluid if the circulating fluid has high compatibility with water, and therefore the circulating fluid must be frequently replaced. The low molecular weight ester compound has high compatibility with water, and water separation tends to be difficult.

[0013] The cooling / heating medium composition according to the embodiment contains a low molecular weight ester compound having a melting point of -15°C or less and a boiling point of 150°C or more, and a polysiloxane having a phenyl group. It is considered that such a cooling / heating medium composition can achieve high transparency and separability from water because the polysiloxane having a phenyl group has high compatibility with the low molecular weight ester compound and low compatibility with water.

[0014] In addition, the circulating fluid is also required to be less corrosive to the components that come into contact with the cooling and heating medium liquid, such as the circulating piping in the circulating thermostatic bath and surrounding components.Various resins are often used for the components of the circulating thermostatic bath, including polystyrene (PS) resin, polycarbonate (PC) resin, polyethylene (PE) resin, polypropylene (PP) resin, acrylonitrile-styrene copolymer (AS) resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, polyurethane (PU) resin, acrylic resin, and polyester resin.

[0015] Each component will be described in detail below.

[0016] <Low molecular weight ester compounds> The melting point of the low molecular weight ester compound is −15° C. or lower. The melting point of the low molecular weight ester compound is preferably −20° C. or lower, and more preferably −30° C. or lower. There is no particular lower limit to this melting point, but in one example it is −100° C. or higher, and in another example it is −80° C. or higher.

[0017] The boiling point of the low molecular weight ester compound is 150° C. or higher. The boiling point of the low molecular weight ester compound is preferably 200° C. or higher, and more preferably 250° C. or higher. There is no particular upper limit to this boiling point, but in one example, it is 400° C. or lower, and in another example, it is 350° C. or lower.

[0018] The specific gravity of the low molecular weight ester compound is preferably in the range of 0.90 to 1.20, and more preferably 1.01 to 1.10. By making the specific gravity of the low molecular weight ester compound larger than 1.00, when a contaminant is mixed into the cooling / heating transfer liquid composition, the effect of suppressing the precipitation of the contaminant can be enhanced.

[0019] The relative mass of the low molecular weight ester compound is, for example, 50-1000, or preferably 250-600.

[0020] In the cooling / heating medium composition according to the embodiment, the proportion of the low molecular weight ester compound is, for example, 40% by mass or more and 80% by mass or less. The proportion of the low molecular weight ester compound is preferably 50% by mass or more and 70% by mass or less.

[0021] The low molecular weight ester compound preferably includes a compound represented by the following formula (II).

[0022] [ka]

[0023] In formula (II), ring A is a cyclohexane ring, a cyclohexene ring, or a benzene ring. Ring A is preferably a cyclohexene ring.

[0024] R 20 and R 21 R are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms which may have a substituent. 20 and R 21 R is preferably a linear or branched alkyl group having 3 or more carbon atoms, and more preferably a branched alkyl group having 5 or more carbon atoms. 20 and R 21 It is preferable that they have the same structure as each other.

[0025] The compound represented by formula (II) includes, for example, at least one selected from the group consisting of diethyl phthalate, dibutyl phthalate, diheptyl phthalate, dioctyl phthalate, butyl benzyl phthalate, ethyl cis-4-cyclohexene-1,2-dicarboxylate, bis(2-ethylhexyl) 4-cyclohexene-1,2-dicarboxylate, butyl cis-4-cyclohexene-1,2-dicarboxylate, heptyl cis-4-cyclohexene-1,2-dicarboxylate, and butyl benzyl cis-4-cyclohexene-1,2-dicarboxylate.

[0026] The low molecular weight ester compound may include a compound represented by the following formula (1).

[0027] [ka]

[0028] In formula (1), two Q's are the same or different and each independently represents a hydrogen atom, a linear or branched alkyl group having 1 to 3 carbon atoms, an alkylene group, or a linear or branched alkoxy group having 1 to 6 carbon atoms. When two Q's are linear or branched alkyl or alkylene groups having 1 to 3 carbon atoms, they may be bonded to adjacent carbon atoms to form a ring. This ring may contain a double bond. m represents an integer of 0 to 5. Each of the m k's independently represents an integer of 0 to 2.

[0029] It is preferable that each of the (m+1) X's is independently a divalent substituent represented by the following formula (2).

[0030] [ka]

[0031] In formula (2), "*" indicates a bonding position. Y is a hydrogen atom, a linear or branched alkyl group having 1 to 3 carbon atoms, or a linear or branched alkoxy group having 1 to 6 carbon atoms, or may form a double bond with an adjacent carbon atom. R is a hydrogen atom, or a linear or branched alkyl group having 1 to 10 carbon atoms which may have a substituent. The substituent of R may be, for example, an alkyl group, an alkoxy group, or a halogen group having 1 to 6 carbon atoms. m is preferably an integer of 1 or 2.

[0032] (1) In the case of m=1 Preferably, the alkyl ester is an alkyl ester represented by the following formula (1-1):

[0033] [ka]

[0034] In formula (1-1), k, Q and X are the same as those in formula (1). Examples of R include methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, pentyl, 2-methylbutyl, hexyl, 2-methylpentyl, 3-methylpentyl, 2,3-dimethylbutyl, 2-ethylbutyl, heptyl, 2-methylhexyl, 3-methylhexyl, 2,3-dimethylpentyl, 2-ethylpentyl, octyl, 2-methylheptyl, 3-methylheptyl, 2,3-dimethylhexyl, 2-ethylhexyl, nonyl, 2-methyloctyl, 3-methyloctyl, 2,3-dimethylheptyl, 2-ethylheptyl, decyl and the like. Among these, n-butyl and 2-ethylhexyl are preferred.

[0035] That is, in consideration of the usefulness of the alkyl ester represented by formula (1-1), the alkyl ester represented by the following formula (1-1b) can be mentioned as a suitable one.

[0036] [ka]

[0037] The alkyl ester represented by formula (1-1b) is a compound (bis(2-ethylhexyl) adipate) in which k is 2, both Q's are hydrogen atoms, both Y's are hydrogen atoms, and both R's are 2-ethylhexyl groups in formula (1-1). The melting point of bis(2-ethylhexyl) adipate is −70° C., the boiling point is 214° C., and the density is 0.97 g / cm. 3 It is.

[0038] (2) In the case of m=2 Preferably, the alkyl ester is an ester represented by the following formula (1-2):

[0039] [ka]

[0040] In formula (1-2), k, Q and X have the same meanings as those in formula (1). Among them, the low molecular weight ester compound according to (A) is preferably a citric acid derivative represented by the following formula (1a).

[0041] [ka]

[0042] The citric acid derivative represented by formula (1a) is a citric acid derivative represented by formula (1-2), in which two k's are both 0, two Q's are both hydrogen atoms, Y's associated with X's at both ends are hydrogen atoms, and Y's associated with X's at the center are alkoxyl groups (-OR 1 ).

[0043] In addition, in formula (1a), three R's each independently have the same meaning as that represented by formula (2). 1 is a hydrogen atom or -C(=O)R 2Among them, in order to make the compound represented by formula (1a) bulkier, R 1 is -C(=O)R 2 It is particularly preferable that R is a monovalent substituent represented by the formula: 2 R is a linear or branched alkyl group which may have a substituent. 2 The substituent may be, for example, an alkyl group having 1 to 6 carbon atoms, an alkoxy group, or a halogen group.

[0044] The three R's are each independently a linear or branched alkyl group having 1 to 3 carbon atoms which may have a substituent. In particular, the three R's are preferably an ethyl group which may have a substituent, or a butyl group which may have a substituent. The substituent of R may be, for example, an alkyl group, an alkoxy group, or a halogen group having 1 to 6 carbon atoms. 2 is particularly preferably an ethyl group. 1 is more preferably an acyl group.

[0045] Considering the usefulness of the citric acid derivative represented by formula (1a), triethyl citrate, tributyl citrate, acetyl triethyl citrate, and acetyl tributyl citrate can be mentioned as suitable examples. Among them, acetyl tributyl citrate is the most suitable. Acetyl tributyl citrate is represented by formula (1a) where R 1 is an acyl group, and the three R are butyl groups. The melting point of acetyl tributyl citrate is -80°C, the boiling point is 343°C, and the density is 1.05g / cm 3 It is.

[0046] (3) Other examples for m=1 or 2 The low molecular weight ester compound is an alkyl ester of a polybasic acid, and is not particularly limited, and may be one produced by a known method, or one available as a commercial product, reagent, etc. As long as the effects of the present invention are not impaired, the production method is not particularly limited, and for example, the low molecular weight ester compound can be easily obtained by subjecting a predetermined acid component and an alcohol component to an esterification reaction or an ester exchange reaction according to a conventional method, preferably in an inert gas atmosphere such as nitrogen, in the absence or presence of a catalyst.

[0047] The low molecular weight ester compounds may be blended in the cooling / heating transfer liquid composition of the present invention either alone or in suitable combination of two or more kinds.

[0048] Other examples of alkyl esters of polybasic acids include citrate esters such as trimethyl citrate, tripropyl citrate, and triisopropyl citrate; acetyl citrate esters such as acetyl trimethyl citrate, acetyl triethyl citrate, acetyl tripropyl citrate, and acetyl triisopropyl citrate; cyclohexene dicarboxylate diesters such as 4-cyclohexene-1,2-dicarboxylate diisononyl ester, 4-cyclohexene-1,2-dicarboxylate diisodecyl ester, and 2-cyclohexene-1,4-dicarboxylate diisodecyl ester; diisononyl adipate; and di-2-ethylhexyl sebacate. , aliphatic dibasic acid esters such as diisononyl sebacate, phthalic acid esters such as dibutyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate, diisodecyl phthalate, diundecyl phthalate, ditridecyl phthalate, isophthalic acid esters such as bis(2-ethylhexyl) isophthalate, terephthalic acid esters such as bis(2-ethylhexyl) terephthalate, trimellitic acid esters such as tri-2-ethylhexyl trimellitate, triisononyl trimellitate, triisodecyl trimellitate, and pyromellitic acid esters such as tetra-2-ethylhexyl pyromellitate. Among them, acetyl tributyl citrate is more preferable. The alkyl ester of polybasic acid may be used alone or in combination of two or more.

[0049] <Polysiloxane having a phenyl group> The melting point of the polysiloxane having a phenyl group is preferably −30° C. or lower, and more preferably −55° C. or lower. There is no particular lower limit to this melting point, but in one example it is −150° C. or higher, and in another example it is −120° C. or higher.

[0050] The boiling point of the polysiloxane having a phenyl group is preferably 100° C. or higher, and more preferably 200° C. or higher. There is no particular upper limit to this boiling point, but in one example it is 500° C. or lower, and in another example it is 400° C. or lower.

[0051] The specific gravity of the polysiloxane having a phenyl group is preferably in the range of 0.90 to 1.20, and more preferably 1.01 to 1.10.

[0052] The weight average molecular weight of the polysiloxane having a phenyl group is preferably in the range of 10,000 to 300,000, more preferably in the range of 10,000 to 100,000. The polysiloxane having a phenyl group with a molecular weight within this range tends to have high solubility in low molecular weight ester compounds. The weight average molecular weight can be measured by gel permeation chromatography.

[0053] In the cooling / heating medium composition according to the embodiment, the proportion of the polysiloxane having a phenyl group is, for example, 20% by mass or more and 60% by mass or less. The proportion of the polysiloxane having a phenyl group is preferably 25% by mass or more and 55% by mass or less, and more preferably 30% by mass or more and 50% by mass or less.

[0054] The polysiloxane having a phenyl group preferably includes a phenylpolysiloxane represented by the following formula (I).

[0055] [ka]

[0056] In formula (I), R 10 , R 11 , and R 12 R is each independently a phenyl group or a methyl group. 10 is preferably a phenyl group. 11 and R 12 is preferably a methyl group.

[0057] m is an integer of 1 or more and 10000 or less. n is an integer of 1 or more and 10000 or less. n and m may be 100 or more, or may be 1000 or more.

[0058] Specific examples of polysiloxanes having a phenyl group include methylphenylpolysiloxane (KF-54, KF-54HV, manufactured by Shin-Etsu Chemical Co., Ltd.), diphenylsiloxyphenyl trimethicone (KF-56A, manufactured by Shin-Etsu Chemical Co., Ltd.), and the like.

[0059] <Other ingredients> The cooling / heating medium composition according to the embodiment may be composed only of a low molecular weight ester compound and a polysiloxane having a phenyl group, or may contain other components.

[0060] Other ingredients include fluorine-based organic compounds, 1.0 gcm -3 Examples of additives include those having a density higher than

[0061] The global warming potential of the fluorine-based organic compound is preferably not more than 100, and more preferably not more than 50. The specific gravity of the fluorine-based organic compound is, for example, 1.20 or more and 2.0 or less, and preferably 1.30 or more and 1.80 or less.

[0062] The number of carbon atoms in the fluorine-based organic compound is preferably 1 or more and 5 or less. The fluorine-based organic compound preferably includes a fluoroalcohol having at least one C-F bond. The fluoroalcohol includes a perfluoroalcohol and a partially fluorinated alcohol. The fluorine-based organic compound preferably includes a partially fluorinated alcohol. Examples of partially fluorinated alcohols include 2,2,3,3-tetrafluoro-1-propanol (specific gravity: 1.49) and 2,2,3,3,4,4,5,5-octafluoro-1-pentanol (specific gravity: 1.67).

[0063] 1.0gcm -3 The additive having a density higher than 1000 can be a resin or an inorganic compound fine particle. The resin has many oxygen atoms and nitrogen atoms in the molecular structure, such as polylactic acid, polymethyl methacrylate, polyvinyl chloride resin, etc. The inorganic compound includes metal oxides such as titania and zirconia.

[0064] <Manufacturing method> The method for producing a cooling / heating transfer liquid composition according to the embodiment includes heating a mixture of a low molecular weight ester compound and a polysiloxane having a phenyl group at a temperature of 30° C. or higher and 300° C. or lower.

[0065] The cooling / heating transfer liquid composition according to the embodiment can be produced, for example, by the following method. First, a liquid low molecular weight ester compound, a liquid polysiloxane having a phenyl group, and optionally a liquid fluorine-based organic compound are mixed together to obtain a mixture. The order of mixing is not particularly limited.

[0066] Next, this mixture is heated at a temperature equal to or lower than the decomposition temperature of the low molecular weight ester compound. The mixture is preferably heated in an incubator for 1 to 2 days. This causes the low molecular weight ester compound to migrate into the polysiloxane having a phenyl group, causing the polysiloxane having a phenyl group to swell. The heating temperature is, for example, in the range of 30°C to 300°C, preferably in the range of 30°C to 80°C, and more preferably in the range of 30°C to 50°C.

[0067] The mixture after heating may be crushed or defibrated by a known method. It is preferable to stir the mixture at the heating temperature described above at a rotation speed of 300 rpm or more using a stirring blade having blades such as anchor blades connected to a stirrer such as a homogenizer or a three-one motor.

[0068] <Application> The cooling / heating medium composition according to the embodiment can be suitably used as a circulating fluid for a circulating thermostatic device. In particular, the circulating thermostatic device can be suitably used as a circulating fluid for an open-type circulating thermostatic device. The circulating thermostatic device includes, for example, a container for storing the cooling / heating medium composition according to the embodiment, a pipe connected to the container, and a circulation mechanism for circulating the cooling / heating medium composition. EXAMPLES

[0069] In the examples and comparative examples, the raw materials used in the production of the cooling / heating transfer liquid composition of the present invention and the evaluation methods are as follows, but the present invention is not limited to these examples.

[0070] Example 1 To a 50 cc screw cap bottle, 60.0 parts by mass of ethyl cis-4-cyclohexene-1,2-dicarboxylate and 40.00 parts by mass of methylphenylpolysiloxane were added at room temperature, and the mixture was heated in an incubator at 85° C. for 90 minutes to obtain a cooling / heating medium composition.

[0071] (Examples 2 to 8, Comparative Examples 1 to 11) A cooling / heating medium composition was obtained in the same manner as in Example 1, except that the types and ratios of each component were changed as shown in Table 1 or Table 2.

[0072] The components shown in Tables 1 and 2 are as follows. Each value in the table means a mass proportion.

[0073] (A) Low molecular weight ester compound Diethyl phthalate (specific gravity: 1.12, melting point: -41, boiling point: 296); Fujifilm Wako Pure Chemical Industries, Ltd. Diheptyl phthalate (specific gravity: 0.988, melting point: -46, boiling point: 245; manufactured by Aldrich Co., Ltd.) Ethyl cis-4-cyclohexene-1,2-dicarboxylate (specific gravity: 1.08, melting point: -49, boiling point: 114); manufactured by Tokyo Chemical Industry Co., Ltd. Bis(2-ethylhexyl) 4-cyclohexene-1,2-dicarboxylate (specific gravity: 0.97, melting point: -60, boiling point: 460); manufactured by Tokyo Chemical Industry Co., Ltd. (B) Modified polysiloxane Dimethylpolysiloxane (viscosity: 10·s, specific gravity: 0.935, melting point: -100, boiling point: 200) KF-96-10CS; manufactured by Shin-Etsu Chemical Co., Ltd. Methylhydrogenpolysiloxane (viscosity: 20c / s, specific gravity: 1.00, melting point: -100, boiling point: 200) KF-99; manufactured by Shin-Etsu Chemical Co., Ltd. Methylphenylpolysiloxane (viscosity: 400c / s, specific gravity: 1.07, melting point: -55, boiling point: 300) KF-56; manufactured by Shin-Etsu Chemical Co., Ltd. Fluorine-based organic compounds 2,2,3,3-Tetrafluoro-1-propanol (specific gravity: 1.49); manufactured by Tokyo Chemical Industry Co., Ltd. 2,2,3,3,4,4,5,5-Octafluoro-1-pentanol (specific gravity: 1.67); manufactured by Tokyo Chemical Industry Co., Ltd. (Evaluation test) <(I) Compatibility Evaluation> The cooling / heating medium composition was allowed to stand at room temperature, and the state was evaluated by visual observation. ◎: Completely dissolved ○: Partly dissolved △: Partially dissolved ×: Insoluble <(II) Evaluation of Transparency of Composition> The cooling / heating medium composition was allowed to stand at room temperature, and the state of the solution was evaluated by visual observation. ◎: Very transparent ○: Slightly transparent △: Slightly opaque ×: Very opaque <(III) Evaluation of solution stability at 25°C> The cooling / heating medium composition was allowed to stand at room temperature, and the state was evaluated by visual observation. ◎: Very stable ○: Almost stable △: Somewhat unstable ×: Very unstable <(IV) Separability Evaluation> ( )g of the cooling / heating medium composition and ( )g of ion-exchanged water were added to a 50 mL sample bottle, manually shaken for 1 minute, and then allowed to stand to separate into an organic phase and an aqueous phase. The time it took to separate into the organic phase and the aqueous phase was then evaluated.

[0074] ◎: Organic and aqueous phases separate within a few minutes ○: Organic and aqueous phases separated within a few hours △: Separation into organic and aqueous phases within one day ×: Organic and aqueous phases separate within 2 to 3 days The evaluation results are shown in Tables 1 and 2.

[0075] [Table 1]

[0076] [Table 2]

[0077] Preferred embodiments are described below. [1] A low molecular weight ester compound having a melting point of -15°C or lower and a boiling point of 150°C or higher; A polysiloxane having a phenyl group; A cooling / heating medium composition comprising: [2] The cooling / heating medium composition according to [1], wherein the polysiloxane having a phenyl group includes a phenylpolysiloxane represented by the following formula (I):

[0078] [ka]

[0079] In the formula (I), R 10 , R 11 , and R 12 are each independently a phenyl group or a methyl group, m is an integer between 1 and 10,000, n is an integer greater than or equal to 1 and less than or equal to 10,000. [3] The low molecular weight ester compound includes a compound represented by the following formula (II):

[0080] [ka]

[0081] In the formula (II), Ring A is a cyclohexane ring, a cyclohexene ring, or a benzene ring; R 20 and R 21 are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms which may have a substituent. [4] The cooling / heating medium composition according to any one of [1] to [3], wherein the proportion of the polysiloxane having a phenyl group is 20 mass % or more and 60 mass % or less. [5] The cooling / heating medium composition according to any one of [1] to [4], wherein the proportion of the low molecular weight ester compound is 40 mass % or more and 80 mass % or less. [6] The cooling / heating medium composition according to any one of [1] to [5], wherein the specific gravity of the polysiloxane having a phenyl group is 0.90 or more and 1.20 or less. [7] The cooling / heating transfer medium composition according to any one of [1] to [6], wherein the specific gravity of the low molecular weight ester compound is 0.90 or more and 1.20 or less. [8] The cooling / heating medium composition according to any one of [1] to [7], further comprising a fluorine-based organic compound. [9] The cooling / heating medium composition according to [8], wherein the proportion of the fluorine-based organic compound is 1% by mass or more and 20% by mass or less.

[10] 1.0g / cm 3 The cooling / heating medium composition according to any one of [1] to [9], further comprising fine particles of a resin or an inorganic compound having a higher density.

[11] A circulating thermostatic device comprising a container that contains the cooling / heating medium composition according to any one of [1] to

[10] .

[12] heating a mixture of the low molecular weight ester compound and the polysiloxane having a phenyl group at a temperature of 30 to 300° C. A method for producing a cooling / heating medium composition according to any one of [1] to

[11] .

Claims

1. A low molecular weight ester compound having a melting point of −15° C. or lower and a boiling point of 150° C. or higher; A polysiloxane having a phenyl group; A cooling / heating medium composition comprising:

2. The cooling / heating medium composition according to claim 1, wherein the polysiloxane having a phenyl group includes a phenylpolysiloxane represented by the following formula (I): 【Chemistry 1】 In the formula (I), R １０ , R １１ , and R １２ are each independently a phenyl group or a methyl group, m is an integer of 1 to 10,000, n is an integer of 1 or more and 10,000 or less.

3. The cooling / heating medium composition according to claim 1, wherein the low molecular weight ester compound comprises a compound represented by the following formula (II): 【Chemistry 2】 In the formula (II), Ring A is a cyclohexane ring, a cyclohexene ring, or a benzene ring; R ２０ and R ２１ are each independently a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms which may have a substituent.

4. The cooling / heating medium composition according to claim 1 , wherein the proportion of the polysiloxane having a phenyl group is 20% by mass or more and 60% by mass or less.

5. The cooling / heating medium composition according to claim 1 , wherein the low molecular weight ester compound accounts for 40% by mass or more and 80% by mass or less.

6. The cooling / heating medium composition according to claim 1 , wherein the specific gravity of the polysiloxane having a phenyl group is 0.90 or more and 1.20 or less.

7. The cooling / heating medium composition according to claim 1 , wherein the specific gravity of the low molecular weight ester compound is 0.90 or more and 1.20 or less.

8. The cooling / heating medium composition according to claim 1 , further comprising a fluorine-based organic compound.

9. The cooling / heating medium composition according to claim 8 , wherein the proportion of the fluorine-based organic compound is 1% by mass or more and 20% by mass or less.

10. 1.0 g / cm ３ The cooling / heating medium composition according to claim 1 , further comprising fine particles of a resin or an inorganic compound having a higher density.

11. A circulating thermostatic device comprising a container that contains the cooling / heating medium composition according to claim 1.

12. heating a mixture of the low molecular weight ester compound and the polysiloxane having a phenyl group at a temperature of 30 to 300° C. A method for producing the cooling / heating medium composition according to claim 1.

Images