Cooling liquid and preparation method thereof

Abstract

The invention discloses a cooling liquid and a preparation method thereof. The cooling liquid comprises base oil, a flame retardant and a synergist, wherein the synergist comprises at least one of an aldehyde substance containing a six-membered ring and a ketone substance containing a six-membered ring. The cooling liquid provided by the invention is free of pungent smell and has relatively good insulation performance and safety performance.

Description

Technical Field

[0001] The present invention relates to the field of energy storage safety technology, and in particular to a coolant and a preparation method thereof. Background Art

[0002] As the core of immersion energy storage technology, the thermophysical properties of coolant directly affect the operating performance of lithium battery systems. At present, the coolants used in immersion thermal management systems at home and abroad are mainly divided into: fluorinated liquid, hydrocarbons, esters, and silicone oils. Among them, although fluorinated liquid has excellent flame retardant properties and material compatibility, its insulation performance is relatively poor. There is a safety risk of leakage short circuit during long-term operation. Enhancing its insulation performance is still the main problem facing this type of product. In comparison, hydrocarbons, esters and silicone oils have good insulation properties, but poor flame retardant properties. It is usually necessary to introduce halogenated hydrocarbons as flame retardants to enhance their flame retardant properties. However, halogenated hydrocarbons have a large irritating odor, which is not conducive to large-scale production and mass application.

[0003] Therefore, there is an urgent need for a coolant with no irritating odor, good insulation performance and good safety performance. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, one object of the present invention is to provide a coolant and a preparation method thereof. The coolant provided by the present application has no irritating odor and has good insulation performance.

[0005] In one aspect of the present invention, the present invention provides a coolant. According to an embodiment of the present invention, the coolant comprises a base oil, a flame retardant and a synergist, wherein the synergist comprises at least one of an aldehyde substance containing a six-membered ring and a ketone substance containing a six-membered ring.

[0006] According to the coolant of the above embodiment of the present invention, the base oil has certain insulating properties, and the insulating properties can be further optimized by adding flame retardants and synergists. The base oil, as the main liquid carrier, provides a basis for the insulating properties. The presence of flame retardants can prevent the coolant from being destroyed when encountering high temperature or fire source, thereby indirectly maintaining the insulating properties. The synergist can directly synergize with the base oil and flame retardant to improve the performance of the coolant. Among them, aldehyde or ketone synergists containing six-membered rings help to improve the insulating properties of the coolant. The six-membered ring structure (such as benzene ring) itself has a special electronic structure that can effectively prevent the conduction of electrons. For example, the conjugated π electron system of the benzene ring delocalizes the electrons, reduces the energy state of the molecule, and forms a barrier to electron conduction in the coolant system. When the current tries to pass through the coolant, this structure can reduce the movement path of the electrons, thereby enhancing the insulating properties of the coolant, which is beneficial to improving the safety performance of the coolant. The carbonyl (-C=O) functional group in aldehydes or ketones has certain chemical activity and can react with odor-producing substances. For example, the aldehyde group (-CHO) can undergo an addition reaction or an oxidation-reduction reaction with a compound having an odor, converting it into a substance with a lighter odor or no odor. Therefore, the coolant provided by the present application has no irritating odor and has good insulation performance.

[0007] In addition, the coolant according to the above embodiment of the present invention may also have the following additional technical features:

[0008] In some embodiments of the present invention, the mass of the synergist is A, the mass of the base oil is B, and the mass of the flame retardant is C, wherein 0.5%≤A / (B+C)×100%≤5%. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0009] In some embodiments of the present invention, the aldehyde substance containing a six-membered ring includes at least one of butylphenylmethyl propionaldehyde, piperonyl propionaldehyde, methyl hexyl cinnamaldehyde, 3-methoxy-4-hydroxybenzaldehyde, and 3-phenyl acrolein. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0010] In some embodiments of the present invention, the ketone substance containing a six-membered ring includes at least one of 2,3-dimethyl-5-isopropenyl-cyclohexanone, 5-methyl-2-(1-methylethyl)cyclohexanone, menthone, and ambroxanone. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0011] In some embodiments of the present invention, the base oil includes at least one of mineral oil, silicone oil, synthetic ester, natural ester, and fluorinated liquid. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0012] In some embodiments of the present invention, the mineral oil includes at least one of paraffin-based oil and naphthenic oil. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0013] In some embodiments of the present invention, the mineral oil includes at least one of No. 10 mineral oil, No. 25 mineral oil, and No. 45 mineral oil.

[0014] In some embodiments of the present invention, the silicone oil includes at least one of methyl silicone oil and modified silicone oil of methyl silicone oil. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0015] In some embodiments of the present invention, the silicone oil is at least one of dimethyl silicone oil, methylphenyl silicone oil, methylethoxy silicone oil, methyltrifluoropropyl silicone oil, and methylvinyl silicone oil.

[0016] In some embodiments of the present invention, the synthetic ester includes at least one of a phosphate ester and a fatty acid ester. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0017] In some embodiments of the present invention, the synthetic ester includes at least one of trioctyl phosphate, tributyl phosphate, trimethylolpropane trioleate, and pentaerythritol tetraoleate.

[0018] In some embodiments of the present invention, the natural ester includes vegetable oil. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0019] In some embodiments of the present invention, the natural ester includes at least one of olive oil, peanut oil, soybean oil, corn oil, sunflower oil, and palm oil.

[0020] In some embodiments of the present invention, the fluorinated liquid includes at least one of a perfluorinated compound and a hydrofluoroether. Thus, a coolant having no irritating odor and high insulation and safety performance can be obtained.

[0021] In some embodiments of the present invention, the fluorinated liquid includes at least one of perfluorotriethylamine, perfluorotripropylamine, perfluorooctane, perfluoroheptane, methyl nonafluorobutyl ether, and ethyl nonafluorobutyl ether.

[0022] In some embodiments of the present invention, the flame retardant includes halogenated hydrocarbons, and the halogen element in the halogenated hydrocarbons includes at least one of fluorine, chlorine, bromine and iodine. Thus, a coolant with no irritating odor and high insulation and safety performance can be obtained.

[0023] In some embodiments of the present invention, the halogenated hydrocarbon includes at least one of tetrachloroethylene, tetrachloroethane, tetrabromoethane, tetrabromoethylene, hexachloroethane, dibromotetrafluoroethane, dibromotetrachloroethane, tribromotrifluoroethane, 1,2-dibromo-1-chloro-1,2,2-trifluoroethane, dibromohexafluoropropane, trichloropentafluoropropane, hexachloroacetone, hexachloropropylene, hexachlorobutadiene, dibromooctafluorobutane, dibromohexafluorocyclobutane, dichlorooctafluorobutane, dichlorohexafluorocyclobutane, diiodoperfluorobutane and dibromoperfluorohexane. Thus, a coolant having no irritating odor and high insulation and safety properties can be obtained.

[0024] In a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned coolant. According to an embodiment of the present invention, the method comprises: mixing a base oil, a flame retardant and a synergist to obtain a coolant, wherein the synergist comprises at least one of an aldehyde substance containing a six-membered ring and a ketone substance containing a six-membered ring. Thus, the method is simple, and the obtained coolant has no irritating odor and has both good insulation performance and safety performance.

[0025] In some embodiments of the present invention, the mixing temperature is 40°C-60°C.

[0026] In some embodiments of the present invention, the mixing speed is 600 r / min-1000 r / min.

[0027] In some embodiments of the present invention, the mixing time is 5h-12h.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of the embodiments, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In one aspect of the present invention, the present invention provides a coolant. According to an embodiment of the present invention, the coolant comprises a base oil, a flame retardant and a synergist, wherein the synergist comprises at least one of an aldehyde substance containing a six-membered ring and a ketone substance containing a six-membered ring.

[0031] According to the coolant of the above embodiment of the present invention, the base oil has certain insulating properties, and the insulating properties can be further optimized by adding flame retardants and synergists. The base oil, as the main liquid carrier, provides a basis for the insulating properties. The presence of flame retardants can prevent the coolant from being destroyed when encountering high temperature or fire source, thereby indirectly maintaining the insulating properties. The synergist can directly synergize with the base oil and flame retardant to improve the performance of the coolant. Among them, aldehyde or ketone synergists containing six-membered rings help to improve the insulating properties of the coolant. The six-membered ring structure (such as benzene ring) itself has a special electronic structure that can effectively prevent the conduction of electrons. For example, the conjugated π electron system of the benzene ring delocalizes the electrons, reduces the energy state of the molecule, and forms a barrier to electron conduction in the coolant system. When the current tries to pass through the coolant, this structure can reduce the movement path of the electrons, thereby enhancing the insulation of the coolant, which is conducive to improving the safety performance of the coolant. The carbonyl (-C=O) functional group in aldehydes or ketones has certain chemical activity and can react with odor-producing substances. For example, the aldehyde group (-CHO) can undergo an addition reaction or an oxidation-reduction reaction with a compound having an odor, converting it into a substance with a lighter odor or no odor. Therefore, the coolant provided by the present application has no irritating odor and has good insulation performance.

[0032] According to some embodiments of the present invention, the mass of the synergist is A, the mass of the base oil is B, and the mass of the flame retardant is C, wherein 0.5%≤A / (B+C)×100%≤5%. For example, it can be 0.5%, 1%, 2%, 3%, 4%, 5%, etc. By limiting the content of the synergist within the above range, it is helpful to effectively remove the pungent odor of the coolant. If the content of the synergist is too low, it is not possible to provide enough active functional groups (such as carbonyl groups in aldehydes or ketones) to react chemically with components that produce pungent odors (such as halogenated hydrocarbons). If the content of the synergist is too high, it will destroy the molecular balance inside the coolant, resulting in overly complex interactions between molecules, which is not conducive to forming a stable insulating structure, thereby affecting the insulating properties of the coolant. Therefore, by limiting the content of the synergist within the above range, a coolant with no pungent odor and good insulating and safety performance can be obtained.

[0033] According to some embodiments of the present invention, the aldehyde substances containing six-membered rings include at least one of butylphenylmethyl propionaldehyde, piperonyl propionaldehyde, methyl hexyl cinnamaldehyde, 3-methoxy-4-hydroxybenzaldehyde, and 3-phenyl acrolein. The above-mentioned aldehyde substances containing six-membered rings are selected as synergists. On the one hand, these aldehyde substances all contain six-membered ring structures (such as benzene rings), and the conjugated π electron system of the benzene ring can effectively hinder electron conduction. For example, the benzene ring structure in butylphenylmethyl propionaldehyde makes the electrons delocalized in the ring, and the molecular energy state is low. When it exists in the coolant, it is like setting a barrier at the molecular level to prevent the easy movement of electrons, thereby improving the insulation performance of the coolant. The benzene rings in methyl hexyl cinnamaldehyde, 3-methoxy-4-hydroxybenzaldehyde and 3-phenyl acrolein also have similar effects. On the other hand, the carbonyl (-C=O) functional group in these aldehyde substances is chemically active. Taking the coolant containing halogenated hydrocarbons that produces a pungent odor as an example, aldehyde substances can react chemically with halogenated hydrocarbons. For example, the aldehyde group (-CHO) in 3-methoxy-4-hydroxybenzaldehyde can react with the acidic odorous substances produced by halogenated hydrocarbons to convert the odorous acidic substances into relatively odorless compounds, thereby reducing the pungent odor of the coolant. Therefore, the selection of the above-mentioned synergist can remove the pungent odor in the coolant and improve the insulation performance and safety performance of the coolant.

[0034] According to some embodiments of the present invention, the ketone substance containing a six-membered ring includes at least one of 2,3-dimethyl-5-isopropenyl-cyclohexanone, 5-methyl-2-(1-methylethyl)cyclohexanone, menthone, and ambroxanone. The above-mentioned ketone substances containing a six-membered ring are selected as synergists. On the one hand, these ketone substances all contain a six-membered ring (cyclohexanone structure). The six-membered ring structure has a stable electron cloud distribution and can hinder the conduction path of electrons. Taking 2,3-dimethyl-5-isopropenyl-cyclohexanone as an example, the six-membered ring structure of cyclohexanone allows electrons to form a relatively stable delocalized state within the ring. When this ketone substance is present in the coolant, it is like constructing an insulating barrier at the molecular level to prevent current from passing through, thereby effectively improving the insulating properties of the coolant. On the other hand, the carbonyl (-C=O) functional group in these ketone substances is chemically active. In the coolant, it can react with substances that produce pungent odors. For example, when there are some halogenated hydrocarbons with peculiar smell in the coolant, the carbonyl groups of these ketone substances may react chemically with the halogenated hydrocarbons, converting the odor-producing substances into relatively odorless compounds. Therefore, the selection of the above-mentioned synergist can remove the pungent smell in the coolant and improve the insulation performance and safety performance of the coolant.

[0035] According to some embodiments of the present invention, the base oil includes at least one of mineral oil, silicone oil, synthetic ester, natural ester, and fluorinated liquid. The above-mentioned base oil is selected. On the one hand, the base oil can be used as a stable medium to prevent other components (such as flame retardants, synergists, etc.) in the coolant from separating, and these components can be evenly dissolved in the coolant system to ensure that the performance of the coolant is uniform. On the other hand, the above-mentioned base oil has a higher specific heat capacity and can absorb a large amount of heat while its own temperature rise is relatively small. For example, when the heat source (such as an engine, an electronic chip, etc.) in the cooling system transfers heat to the coolant, the base oil is like a "heat carrier" to take the heat away from the high temperature area. In the automobile engine cooling system, the base oil can effectively absorb the heat generated by the engine, and then dissipate the heat into the air through the radiator, thereby maintaining the normal working temperature of the engine.

[0036] As an example, the mineral oil includes but is not limited to at least one of paraffin-based oil and naphthenic oil, such as No. 10 mineral oil, No. 25 mineral oil, No. 45 mineral oil, and the like.

[0037] As an example, the silicone oil includes but is not limited to at least one of methyl silicone oil and modified silicone oil of methyl silicone oil, such as dimethyl silicone oil, methylphenyl silicone oil, methylethoxy silicone oil, methyltrifluoropropyl silicone oil, methylvinyl silicone oil, etc.

[0038] As an example, the synthetic ester includes but is not limited to at least one of phosphate ester and fatty acid ester, such as trioctyl phosphate, tributyl phosphate, trimethylolpropane trioleate, pentaerythritol tetraoleate, and the like.

[0039] As an example, the natural ester includes but is not limited to vegetable oils, such as at least one of olive oil, peanut oil, soybean oil, corn oil, sunflower oil, and palm oil.

[0040] As an example, the fluorinated liquid includes but is not limited to at least one of perfluorinated compounds and hydrofluoroethers, such as perfluorotriethylamine, perfluorotripropylamine, perfluorooctane, perfluoroheptane, methyl nonafluorobutyl ether, ethyl nonafluorobutyl ether, and the like.

[0041] According to some embodiments of the present invention, the flame retardant oil includes a flame retardant. The flame retardant in the flame retardant oil can play a role in fire prevention. When encountering a fire source, the flame retardant can prevent the spread of the flame. For example, some flame retardants will decompose when heated to produce gas-phase flame retardant elements such as P, Cl, N, Br, etc., which will capture combustion free radicals such as H, OH, interrupt the combustion chain reaction, and quench the flame. In addition, some flame retardants can also produce non-flammable gases such as carbon dioxide and ammonia when decomposed by heat. These gases can dilute the oxygen concentration in the surrounding air, thereby inhibiting the combustion reaction, thereby improving the safety performance of the coolant. Therefore, the addition of flame retardants can improve the safety performance of the coolant.

[0042] As an example, the flame retardant includes halogenated hydrocarbons, and the halogen element in the halogenated hydrocarbons includes at least one of fluorine, chlorine, bromine, and iodine.

[0043] As an example, the halogenated hydrocarbon includes at least one of tetrachloroethylene, tetrachloroethane, tetrabromoethane, tetrabromoethylene, hexachloroethane, dibromotetrafluoroethane, dibromotetrachloroethane, tribromotrifluoroethane, 1,2-dibromo-1-chloro-1,2,2-trifluoroethane, dibromohexafluoropropane, trichloropentafluoropropane, hexachloroacetone, hexachloropropylene, hexachlorobutadiene, dibromooctafluorobutane, dibromohexafluorocyclobutane, dichlorooctafluorobutane, dichlorohexafluorocyclobutane, diiodoperfluorobutane and dibromoperfluorohexane.

[0044] In the second aspect of the present invention, the present invention proposes a method for preparing the above-mentioned coolant. According to an embodiment of the present invention, a base oil, a flame retardant and a synergist are mixed to obtain a coolant, wherein the synergist comprises at least one of an aldehyde substance containing a six-membered ring and a ketone substance containing a six-membered ring. Therefore, the method provided by the present application is simple, and the obtained coolant has no irritating odor and has both good insulation performance and safety performance. It should be noted that the above-mentioned features and advantages described for the coolant are also applicable to the preparation method of the coolant, which will not be repeated here.

[0045] According to some embodiments of the present invention, the mixing temperature is 40°C-60°C. For example, it can be 40°C, 50°C, 60°C, etc. On the one hand, limiting the mixing time can ensure that the base oil, flame retardant and synergist are fully mixed, and the six-membered ring structure in the synergist can be evenly distributed in the coolant, thereby effectively hindering electron conduction, which is beneficial to improving the insulation performance of the coolant. On the other hand, sufficient mixing time can ensure that the carbonyl (-C=O) functional group in the synergist can fully contact and react with the odor-generating substance, thereby effectively reducing the pungent odor of the coolant.

[0046] According to some embodiments of the present invention, the mixing speed is 600r / min-1000r / min. For example, it can be 600r / min, 700r / min, 800r / min, 900r / min, 1000r / min, etc. By limiting the mixing speed within the above range, sufficient power can be provided for the mixing of base oil, flame retardant and synergist, so that the components can quickly contact each other. For example, the collision between the molecules of aldehydes or ketones containing six-membered rings in the synergist and the base oil molecules increases, which is conducive to physical adsorption, chemical reaction (such as reaction between aldehyde or ketone carbonyl and other functional groups) and other interactions between them, so as to better play the role of the synergist in improving insulation performance and improving odor.

[0047] It should be noted that there is no particular limitation on the mixing method. According to a specific embodiment of the present invention, the mixing method includes stirring.

[0048] According to some embodiments of the present invention, the mixing time is 5h-12h. For example, it can be 5h, 7h, 9h, 10h, 12h, etc. By limiting the mixing time within the above range, it can be ensured that the base oil, flame retardant and synergist are fully mixed, and each component has enough time to diffuse in the entire mixed system, which can promote the synergist (aldehyde or ketone containing six-membered ring) to be uniformly dissolved in the base oil and flame retardant.

[0049] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used that do not specify the manufacturer are all conventional products that can be obtained commercially.

[0050] Example 1

[0051] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil, 40 parts of tetrachloroethane, and 2 parts of butylphenylmethylpropionaldehyde, mix them, and stir them at a temperature of 45° C. and a stirring speed of 800 r / min for 6 hours to obtain a coolant.

[0052] Example 2

[0053] Preparation of the coolant: Weigh 10 parts of No. 25 mineral oil, 90 parts of tetrachloroethane, and 5 parts of butylphenylmethylpropionaldehyde, mix them, and stir them at a temperature of 55° C. and a stirring speed of 800 r / min for 6 hours to obtain a coolant.

[0054] Example 3

[0055] Preparation of the coolant: Weigh 50 parts of dimethyl silicone oil, 50 parts of hexachloroacetone, and 3 parts of ambergris, mix them, and stir them at 45°C and 800 r / min for 6 hours to obtain a coolant.

[0056] Example 4

[0057] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil, 40 parts of tetrachloroethane, and 2 parts of butylphenylmethylpropionaldehyde, mix them, and stir them at a temperature of 40° C. and a stirring speed of 800 r / min for 6 hours to obtain a coolant.

[0058] Example 5

[0059] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil, 40 parts of tetrachloroethane, and 2 parts of butylphenylmethylpropionaldehyde, mix them, and stir them at a temperature of 60° C. and a stirring speed of 800 r / min for 6 hours to obtain a coolant.

[0060] Example 6

[0061] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil, 40 parts of tetrachloroethane, and 2 parts of butylphenylmethylpropionaldehyde, mix them, and stir them at a temperature of 45° C. and a stirring speed of 600 r / min for 6 hours to obtain a coolant.

[0062] Example 7

[0063] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil, 40 parts of tetrachloroethane, and 2 parts of butylphenylmethylpropionaldehyde, mix them, and stir them at a temperature of 45° C. and a stirring speed of 1000 r / min for 6 hours to obtain a coolant.

[0064] Example 8

[0065] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil, 40 parts of tetrachloroethane, and 2 parts of butylphenylmethylpropionaldehyde, mix them, and stir them at a temperature of 45° C. and a stirring speed of 800 r / min for 5 hours to obtain a coolant.

[0066] Example 9

[0067] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil, 40 parts of tetrachloroethane, and 2 parts of butylphenylmethylpropionaldehyde, mix them, and stir them at a temperature of 45° C. and a stirring speed of 800 r / min for 12 hours to obtain a coolant.

[0068] Comparative Example 1

[0069] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil and 40 parts of tetrachloroethane, and stir and mix them at a temperature of 45° C. and a stirring speed of 800 r / min for 6 hours to obtain a coolant.

[0070] Comparative Example 2

[0071] Preparation of the coolant: Weigh 60 parts of No. 25 mineral oil, 40 parts of tetrachloroethane, and 2 parts of thymol, mix them, and stir them at 45°C and 800 r / min for 6 hours to obtain a coolant.

[0072] Testing and analysis

[0073] Under the same conditions, the coolants prepared in the above Examples 1-9 and Comparative Examples 1-2 were tested for pungent odor, insulation performance and safety performance. The specific testing methods are as follows:

[0074] Pungent odor test: Directly smell to visually determine whether there is an obvious pungent odor.

[0075] Insulation performance test: According to the breakdown voltage test method in GB 2536, a breakdown voltage test is performed and the insulation performance is measured by the breakdown voltage value.

[0076] Safety performance test: Place 5 100% SOC cells (rated capacity 45Ah, rated voltage 3.5V) in a cell holder in series arrangement, simulate a 5-cell series module, overcharge the middle cell, and fix it with a splint. After the setting is completed, charge continuously at 1C until overcharging triggers thermal runaway, stop charging, and observe whether the coolant explodes.

[0077] The test results are shown in Table 1.

[0078] Table 1

[0079]

[0080]

[0081] Results and Discussion

[0082] As shown in Table 1, compared with the coolant of Comparative Examples 1-2, the coolant of Examples 1-9 has no irritating odor and has good insulation performance.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A cooling liquid, characterized in that: The coolant comprises base oil, flame retardant and synergist, wherein the synergist comprises at least one of aldehyde substances containing six-membered rings and ketone substances containing six-membered rings.

2. The coolant according to claim 1, characterized in that: The mass of the synergist is A, the mass of the base oil is B, and the mass of the flame retardant is C, wherein 0.5%≤A / (B+C)×100%≤5%.

3. The coolant according to claim 1 or 2, characterized in that: The six-membered ring-containing aldehyde substance includes at least one of butylphenylmethylpropionaldehyde, piperonyl propionaldehyde, methylhexylcinnamaldehyde, 3-methoxy-4-hydroxybenzaldehyde, and 3-phenylacrolein.

4. The coolant according to claim 1 or 2, characterized in that: The ketone substance containing a six-membered ring includes at least one of 2,3-dimethyl-5-isopropenyl-cyclohexanone, 5-methyl-2-(1-methylethyl)cyclohexanone, menthone, and ambroxanone.

5. The coolant according to claim 1 or 2, characterized in that: The base oil includes at least one of mineral oil, silicone oil, synthetic ester, natural ester and fluorinated liquid.

6. The coolant according to claim 5, characterized in that The mineral oil includes at least one of a paraffin-based oil and a naphthenic oil; And / or, the mineral oil includes at least one of No. 10 mineral oil, No. 25 mineral oil, and No. 45 mineral oil; And / or, the silicone oil includes at least one of methyl silicone oil and modified silicone oil of methyl silicone oil; And / or, the silicone oil is at least one of dimethyl silicone oil, methylphenyl silicone oil, methylethoxy silicone oil, methyltrifluoropropyl silicone oil, and methylvinyl silicone oil; And / or, the synthetic ester includes at least one of a phosphate ester and a fatty acid ester; And / or, the synthetic ester includes at least one of trioctyl phosphate, tributyl phosphate, trimethylolpropane trioleate, and pentaerythritol tetraoleate; and / or, the natural ester comprises a vegetable oil; and / or, the natural ester comprises at least one of olive oil, peanut oil, soybean oil, corn oil, sunflower oil, and palm oil; and or, the fluorinated liquid comprises at least one of a perfluorinated compound and a hydrofluoroether; And or, the fluorinated liquid includes at least one of perfluorotriethylamine, perfluorotripropylamine, perfluorooctane, perfluoroheptane, methyl nonafluorobutyl ether, and ethyl nonafluorobutyl ether.

7. The coolant according to claim 6, characterized in that The flame retardant includes halogenated hydrocarbons, and the halogen element in the halogenated hydrocarbons includes at least one of fluorine, chlorine, bromine and iodine.

8. The coolant according to claim 7, characterized in that: The halogenated hydrocarbon includes at least one of tetrachloroethylene, tetrachloroethane, tetrabromoethane, tetrabromoethylene, hexachloroethane, dibromotetrafluoroethane, dibromotetrachloroethane, tribromotrifluoroethane, 1,2-dibromo-1-chloro-1,2,2-trifluoroethane, dibromohexafluoropropane, trichloropentafluoropropane, hexachloroacetone, hexachloropropylene, hexachlorobutadiene, dibromooctafluorobutane, dibromohexafluorocyclobutane, dichlorooctafluorobutane, dichlorohexafluorocyclobutane, diiodoperfluorobutane and dibromoperfluorohexane.

9. A method for preparing the coolant according to any one of claims 1 to 8, characterized in that: include: The base oil, the flame retardant and the synergist are mixed to obtain a coolant, wherein the synergist comprises at least one of an aldehyde substance containing a six-membered ring and a ketone substance containing a six-membered ring.

10. The method according to claim 9, characterized in that The mixing temperature is 40°C-60°C; And / or, the mixing speed is 600r / min-1000r / min; And / or, the mixing time is 5h-12h.

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