Cooling liquid composition as well as preparation method and application thereof and immersed cooling device

Abstract

The invention relates to the technical field of liquid cooling, and discloses a cooling liquid composition, a preparation method and application thereof and an immersed cooling device. The cooling liquid composition is prepared from the following components in parts by mass: 30 to 50 parts of hydrogenated dipolydecene, 10 to 40 parts of II-type base oil and 10 to 40 parts of III-type base oil. Through mutual cooperation and optimization of the components, the low-cost and high-performance cooling liquid composition and the preparation method thereof are developed, and the provided cooling liquid composition has the characteristics of high flash point, large specific heat capacity, low kinematic viscosity, large breakdown voltage and good copper corrosion rating, can be applied to an immersed liquid cooling heat dissipation system and an immersed cooling device, and has good application prospects. The requirements for flowability, electrical insulation and metal compatibility are met, and excellent safety and heat exchange performance are shown.

Description

Technical Field

[0001] The present application relates to the field of liquid cooling technology, and in particular to a coolant composition, a preparation method thereof, an application thereof, and an immersion cooling device. Background Art

[0002] Immersion liquid cooling is a typical direct-contact liquid cooling method. It is a cooling solution that immerses heat-generating electronic components in a refrigerant (i.e., liquid coolant) to achieve efficient heat exchange. When applied to high-power electronic equipment, it can provide an efficient heat dissipation method and effectively control the device temperature to improve the device's energy efficiency and performance. As many high-power density cooling systems (such as data centers, energy storage systems, and new energy charging gun cooling) show a pursuit of high efficiency, energy saving, environmental protection, and intelligence, compared with ordinary liquid cooling and air cooling, immersion liquid cooling is gradually being widely used in various industries due to its significant advantages such as efficient heat dissipation, temperature uniformity, low energy consumption, and compact design.

[0003] As one of the core control points of the immersion liquid cooling system, the characteristics of the liquid cooling medium can directly affect the specifications and performance of the cooling system, the equipment life and the overall cost.

[0004] At present, traditional liquid cooling fluids are difficult to meet the higher requirements of immersion liquid cooling systems in industries such as data centers, energy storage and supercharging, and cannot take into account indicators such as fluidity, safety and heat exchange performance. Summary of the Invention

[0005] The embodiments of the present application provide a coolant composition, a preparation method thereof, an application, and an immersion cooling device, which can reduce costs and take into account the common requirements of immersion liquid cooling and heat dissipation systems.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a coolant composition comprising the following components, by mass: 30 to 50 parts of hydrogenated dimerized decene, 10 to 40 parts of Group II base oil, and 10 to 40 parts of Group III base oil.

[0008] Based on this solution, by combining hydrogenated didecene, Group II base oil and Group III base oil in specific amounts, while significantly reducing costs, the coolant composition has a large breakdown voltage, a good copper corrosion rating of 3h at 100°C, good electrical insulation and strong metal compatibility, which is beneficial for the composition to be used as a coolant in direct contact with equipment in an immersion liquid cooling system. At the same time, it has a high open flash point, which improves safety during application; it has a low viscosity at 40°C, good fluidity, and a large specific heat capacity, which is beneficial for maintaining stable heat transfer efficiency and improving heat exchange performance. The coolant composition takes into account good safety, heat exchange performance, fluidity, electrical insulation and metal compatibility, and can meet the common requirements of immersion liquid cooling and heat dissipation systems.

[0009] In some embodiments of the present application, the Group II base oil includes any one or more of Group II base oil 100N, Group II base oil 150N, and Group II base oil 200N.

[0010] Based on this solution, when the coolant composition has high heat exchange performance and safety, the fluidity can be further enhanced and the cycle energy consumption can be reduced.

[0011] In some embodiments of the present application, the kinematic viscosity of the Group III base oil at 40°C is 5 to 6 mm 2 / s, the open flash point of Group III base oil is greater than or equal to 190℃.

[0012] Based on this solution, the fluidity of the coolant composition described in this application is improved.

[0013] In some embodiments of the present application, the coolant composition further includes any one or more components selected from a dispersant, an antioxidant, a methyl-terminated fluorosilicone oil, a hydrofluoroether, and a dimethyl silicone oil; wherein the hydrofluoroether is selected from any one or more of tetracarbon hydrofluoroether or pentacarbon hydrofluoroether.

[0014] Based on this solution, the desired properties of the coolant composition in the embodiments of the present application can be further imparted or enhanced.

[0015] In some embodiments of the present application, the coolant composition contains no more than 0.1 parts of dispersant, no more than 0.1 parts of antioxidant, no more than 10 parts of methyl-terminated fluorosilicone oil, no more than 5 parts of hydrofluoroether, and no more than 5 parts of dimethyl silicone oil, calculated by weight.

[0016] Based on this solution, the desired properties of the coolant composition in the embodiments of the present application can be further imparted or enhanced.

[0017] In some embodiments of the present application, the dispersant includes polyisobutylene succinimide. In some implementations, the molecular weight of the polyisobutylene succinimide is 600-1800.

[0018] Based on this solution, adding a dispersant to the coolant composition can further inhibit the formation of sludge (i.e., products formed by polymerization or carbonization of the working fluid during thermal decomposition or oxidation reaction at high temperature or long-term operation), which helps to extend the service life of the working fluid.

[0019] In some embodiments of the present application, the antioxidant includes any one or more of dinonyldiphenylamine, 2,6-di-tert-butyl-p-cresol, and 2,4-dimethyl-6-tert-butylphenol.

[0020] Based on this solution, the antioxidant can inhibit the oxidation or decomposition of the working fluid at high temperature, and plays a major role in removing free radicals and other substances that promote the aging and decomposition of the composition components, making the coolant composition less likely to deteriorate, reducing the increase in acid value and the formation of viscous deposits, and extending the service life of the working fluid.

[0021] In some embodiments of the present application, the kinematic viscosity of the methyl terminated fluorosilicone oil at 40° C. is 50 to 100 mm 2 / s.

[0022] Based on this solution, the breakdown voltage can be adjusted and the electrical insulation properties of the coolant composition described in this application can be improved.

[0023] In some embodiments of the present application, the hydrofluoroether is selected from any one or more of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, 1,1,2,2-tetrafluoroethyl ethyl ether, 1,1,2,3,3,3-hexafluoropropyl-2,2,2-trifluoroethyl ether or 1,1,1,2,3,3,3-hexafluoropropyl ethyl ether.

[0024] Based on this solution, the breakdown voltage can be adjusted and the electrical insulation properties of the coolant composition described in this application can be improved.

[0025] In some embodiments of the present application, the kinematic viscosity of dimethyl silicone oil at 40°C is 20 to 50 mm 2 / s.

[0026] Based on this solution, the mixing of fluorides and / or hydrocarbons can be promoted to obtain a coolant composition with low kinematic viscosity, high open flash point, large specific heat capacity, large breakdown voltage and good copper corrosion rating.

[0027] In a second aspect, the present application also provides a method for preparing a coolant composition, which comprises the following steps: providing raw materials according to the components of the coolant composition described in the first aspect of the present application; heating and mixing the raw materials to obtain the coolant composition.

[0028] Based on this scheme, the process is simple and the production cost is low. It can promote the mixing of the components in the coolant composition to obtain a coolant composition with low kinematic viscosity, high open flash point, large specific heat capacity, large breakdown voltage and good copper corrosion rating.

[0029] Specifically, the preparation method comprises heating and uniformly mixing hydrogenated didecene, Group II base oil, Group III base oil, an optional dispersant, an optional antioxidant, an optional methyl-terminated fluorosilicone oil, an optional hydrofluoroether, and an optional dimethyl silicone oil to obtain a coolant composition; wherein the hydrofluoroether is selected from one or more of tetracarbon hydrofluoroether and pentacarbon hydrofluoroether. This method facilitates obtaining a coolant composition having low kinematic viscosity, a high open flash point, a high specific heat capacity, a high breakdown voltage, and a good copper corrosion rating.

[0030] In some embodiments of the present application, the mixing temperature in the preparation method is 40 to 80° C., and the mixing time is 2 to 12 hours.

[0031] Based on this solution, after the mixed coolant composition returns to room temperature, the liquid becomes clear and transparent with no phase separation interface, which is conducive to forming a uniform and stable coolant composition.

[0032] Specifically, the preparation method comprises mixing hydrogenated didecene, Group II base oil, Group III base oil, an optional dispersant, an optional antioxidant, an optional methyl-terminated fluorosilicone oil, an optional hydrofluoroether, and an optional dimethyl silicone oil at 40-80°C for 2-12 hours to obtain a uniform coolant composition; wherein the hydrofluoroether is selected from any one or more of tetracarbon hydrofluoroether or pentacarbon hydrofluoroether. This method is conducive to obtaining a coolant composition with low kinematic viscosity, high open flash point, high specific heat capacity, high breakdown voltage, and good copper corrosion rating.

[0033] In a third aspect, the present application provides an application of the coolant composition as described in the first aspect or the coolant composition prepared by the preparation method described in the second aspect for use in an immersion liquid cooling heat dissipation system, which heat dissipation system includes a chip heat dissipation system, a server heat dissipation system, a data center heat dissipation system, an energy storage heat dissipation system or a new energy vehicle thermal management system.

[0034] In a fourth aspect, the present application further provides an immersion cooling device, which includes a liquid reservoir containing the coolant composition as described in the first aspect or the coolant composition prepared by the preparation method described in the second aspect. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be further described in detail below in conjunction with the embodiments. It should be understood that the embodiments described are only a portion of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0036] In the examples of the present application, the experimental methods used are conventional methods unless otherwise specified; the materials, reagents, etc. used are all available from commercial channels unless otherwise specified.

[0037] In the examples of this application, the terms "a" or "an" are used to describe elements and components described herein. This is done for convenience only and to provide a general sense of the scope of this application. Such descriptions should be understood to include one or at least one, and the singular also includes the plural unless otherwise clearly indicated. "Multiple" means two or more.

[0038] In the embodiments of this application, the terms "comprises," "including," "having," "containing," or any other variations thereof are used to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may also include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0039] In the embodiments of the present application, the terms "optionally", "optional", "optionally", "optional" or "any one" used mean that the matter or event described thereafter may or may not occur, and the description includes situations where the event occurs and situations where the event does not occur.

[0040] In the embodiments of the present application, the term "not exceeding" is used to mean including or covering the upper limit value described thereafter.

[0041] In the examples of this application, the terms "kinematic viscosity" and "dynamic viscosity" are the same concept and can be replaced equivalently. The unit is "mm 2 / s" or "cSt", 1mm 2 / s=1cSt.

[0042] In the embodiments of the present application, the terms "viscosity index" and "viscosity index" used are the same concept and can be equivalently replaced.

[0043] In the examples of this application, the definitions of Group II base oils and Group III base oils disclosed herein are the same as those in Appendix E of the American Petroleum Institute (API) Publication 1509 ("API Base Oil Interchangeability Guidelines for Passenger Car Motor Oils and Diesel Engine Oils," December 2016). Generally, according to the classification standards of the American Petroleum Institute (API Publication 1509-Appendix E), base oils are divided into the following categories:

[0044] Group I base oil: produced by conventional solvent refining, with low saturated hydrocarbon content (less than 90%) and / or high sulfur content (greater than 0.03%), and a viscosity index greater than or equal to 80 and less than 120;

[0045] Group II base oil: produced through hydrocracking process, with high saturated hydrocarbon content (greater than or equal to 90%), low sulfur content (less than or equal to 0.03%), and viscosity index greater than or equal to 80 and less than 120, with better performance than Group I;

[0046] Group III base oil: After deep hydrogenation treatment, it has a higher saturated hydrocarbon content (greater than or equal to 90%) and a lower sulfur content (less than or equal to 0.03%), and a viscosity index greater than or equal to 120, with performance close to that of synthetic oil;

[0047] Group IV base oil: poly alpha-olefin (PAO), fully synthetic base oil;

[0048] Group V base oil: including other oils not included in Groups I, II, III and IV (such as ester oils, hydrogenated didecene and other synthetic oils);

[0049] Among them, Group I base oil, Group II base oil, and Group III base oil are mineral oils, which are cheaper than synthetic oils.

[0050] In the embodiments of the present application, the terms "dimethyl silicone oil" and "dimethicone" used herein are the same concept and can be equivalently replaced.

[0051] In the examples of this application, "copper corrosion" is used as a shorthand expression or description of the "copper strip corrosion test," which is rated on a scale of 1a-4, with lower grades representing better results and lower corrosiveness. Grade 1 is the best and grade 4 is the worst, with grade a being better than grade b in each grade.

[0052] In the embodiment of the present application, the operation of the liquid cooling medium in the heat dissipation system requires the use of or the use of a pump as a power circulation device. The fluidity of the liquid cooling medium will greatly affect the power consumption and output capacity of the pump, and its corresponding evaluation index is kinematic viscosity; when using oil-based liquid cooling medium, due to the flammable and flash-explosive properties of oil, the safety of the liquid cooling medium also needs to be considered, and its corresponding index is the flash point; the essence of heat dissipation by the liquid cooling medium is to take away the heat of the equipment to control the temperature rise of the system, and the index corresponding to its heat exchange capacity is specific heat capacity.

[0053] At present, immersion liquid cooling is in urgent demand in high power density scenarios. For example, the core demand in the data center heat dissipation system is to develop a coolant with a high flash point, low viscosity and compatibility with the copper and aluminum metal materials of the server; the core demand in the energy storage heat dissipation system is to develop a coolant with good insulation, long service life and environmental protection; the core demand in the new energy super charging / automotive thermal management system is to develop a coolant with high specific heat capacity and high pressure resistance. In this regard, the embodiment of the present application provides a coolant composition that meets the higher requirements of industries such as data centers, energy storage and super charging for immersion liquid cooling systems, and takes into account indicators such as fluidity, safety and heat exchange performance, and can better meet the performance requirements of multiple application scenarios for coolants.

[0054] The following is a detailed description of the coolant composition, preparation method, application, and immersion cooling device provided in the examples of the present application.

[0055] An embodiment of the present application provides a coolant composition, which includes the following components in parts by mass: 30 to 50 parts of hydrogenated dimerized decene, 10 to 40 parts of Group II base oil, and 10 to 40 parts of Group III base oil.

[0056] In some specific embodiments, the coolant composition is mainly composed of 30-50 parts of hydrogenated dimerized decene, 10-40 parts of Group II base oil, and 10-40 parts of Group III base oil. Hydrogenated dimerized decene is a relatively low-priced synthetic oil, and Group II base oil and Group III base oil are both relatively low-priced mineral oils. By combining hydrogenated dimerized decene, Group II base oil, and Group III base oil in specific amounts, the cost can be significantly reduced while the coolant composition has good safety, heat transfer performance, fluidity, electrical insulation, and metal compatibility. Among them, the low viscosity of Group III base oil is beneficial to the fluidity of the coolant composition, and the addition of hydrogenated dimerized decene and Group II base oil in a specific ratio is beneficial to increasing the specific heat capacity and flash point of the coolant composition, thereby improving the heat transfer performance and safety of the coolant composition. According to the mass ratio in the coolant composition, the mass ratio of hydrogenated dimerized decene and Group II base oil is 5:1 to 3:4, such as 5:1, 4:1, 3:1, 5:2, 2:1, 3:2, 1:1, 4:5, and 3:4, which can significantly reduce costs while taking into account good safety, heat transfer performance, fluidity, electrical insulation and metal compatibility, while helping to further increase the specific heat capacity and flash point value of the coolant composition, further improve heat transfer performance and safety, and better meet the common requirements of immersion liquid cooling systems.

[0057] In some specific embodiments, the above-mentioned Group II base oil includes any one or more of Group II base oil 100N, Group II base oil 150N, and Group II base oil 200N, which can further enhance fluidity and reduce cycle energy consumption.

[0058] In some specific embodiments, the kinematic viscosity of the above-mentioned Group III base oil at 40°C is 5-6 mm 2 / s and an open flash point of 190°C or above, which can reduce the viscosity and improve the fluidity of the coolant composition described in this application.

[0059] In some specific embodiments, in order to further impart or enhance the desired properties of the coolant composition, any one or more components selected from dispersants, antioxidants, methyl-terminated fluorosilicone oils, hydrofluoroethers (tetracarbon hydrofluoroethers and / or pentacarbon hydrofluoroethers), and dimethyl silicone oils may be further added.

[0060] Optionally, the dispersant in the composition does not exceed 0.1 part, such as 0 part, 0.01 part, 0.02 part, 0.03 part, 0.04 part, 0.05 part, 0.06 part, 0.07 part, 0.08 part, 0.09 part, or 0.1 part, based on the mass fraction of the coolant composition.

[0061] Optionally, the antioxidant in the composition does not exceed 0.1 part, such as 0 part, 0.01 part, 0.02 part, 0.03 part, 0.04 part, 0.05 part, 0.06 part, 0.07 part, 0.08 part, 0.09 part, or 0.1 part, based on the mass fraction of the coolant composition.

[0062] Optionally, the amount of methyl-terminated fluorosilicone oil in the coolant composition is no more than 10 parts by mass, for example, 0 parts, 0.01 parts, 0.1 parts, 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts.

[0063] Optionally, the hydrofluoroether in the composition does not exceed 5 parts by mass of the coolant composition, for example, 0 part, 0.01 part, 0.1 part, 0.5 part, 1 part, 1.5 parts, 2 parts, 3 parts, 4 parts, or 5 parts.

[0064] Optionally, the dimethyl silicone oil in the composition does not exceed 5 parts by mass of the coolant composition, for example, 0 part, 0.01 part, 0.1 part, 0.5 part, 1 part, 1.5 parts, 2 parts, 3 parts, 4 parts, or 5 parts.

[0065] dispersants

[0066] Dispersants facilitate mixing of the various components of a composition and are a class of additives that keep solid and liquid contaminants suspended or inactivated and reduce deposits on equipment components while reducing sludge deposition.

[0067] In some specific embodiments, a dispersant may be added to the coolant composition, including polyisobutylene succinimide. In some implementations, the polyisobutylene succinimide has a molecular weight of 600 to 1800. This can further inhibit the formation of sludge (i.e., products formed by polymerization or carbonization of the working fluid during thermal decomposition or oxidation reactions at high temperatures or during long-term operation) by adsorbing particles and preventing deposition, thereby helping to extend the working fluid's service life.

[0068] antioxidants

[0069] Antioxidants exert their antioxidant effects by absorbing / scavenging free radicals and interrupting chain reactions.

[0070] In some specific embodiments, the antioxidant includes any one or more of dinonyldiphenylamine, 2,6-di-tert-butyl-p-cresol, and 2,4-dimethyl-6-tert-butylphenol, so that the coolant composition is not easily deteriorated, the increase in acid value and the formation of viscous deposits are reduced, and the service life of the working fluid is extended.

[0071] Methyl terminated fluorosilicone oil

[0072] Methyl-terminated fluorosilicone oil is a fluorine-modified polysiloxane with both ends of its molecular chain blocked by inert methyl groups (-CH3) and side chains containing fluoroalkyl groups (such as trifluoropropyl).

[0073] In some specific embodiments, some methyl-terminated fluorosilicone oil may be appropriately added to the coolant composition described in this application. In some implementations, the methyl-terminated fluorosilicone oil has a kinematic viscosity of 50 to 100 mm at 40°C. 2 / s of methyl-terminated fluorosilicone oil can adjust the breakdown voltage and improve the electrical insulation properties of the coolant composition described in this application.

[0074] Hydrofluoroether

[0075] Hydrofluoroethers are a class of organic compounds composed of hydrogen, fluorine and ether bonds.

[0076] In some specific embodiments, a hydrofluoroether may be appropriately added to the coolant composition described herein. The hydrofluoroether may be selected from any one or more of tetrafluoroethyl or pentafluoroether, which can adjust the breakdown voltage and improve the electrical insulation properties of the coolant composition described herein. Representative examples of the above hydrofluoroethers include: 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (tetrafluoroethyl HFE347), 1,1,2,2-tetrafluoroethyl ethyl ether (tetrafluoroethyl HFE374), 1,1,2,3,3,3-hexafluoropropyl-2,2,2-trifluoroethyl ether (pentafluoroethyl HFE449), and 1,1,1,2,3,3,3-hexafluoropropyl ethyl ether (pentafluoroethyl HFE476).

[0077] Dimethicone

[0078] Dimethyl silicone oil is the most common silicone oil, with the chemical name polydimethylsiloxane (PDMS). Its molecular chain is composed of repeated -Si(CH3)2O- units, and both ends are usually capped with trimethylsilyl (-Si(CH3)3).

[0079] In some embodiments, some dimethyl silicone oil may be added to the coolant composition. In some implementations, the dimethyl silicone oil has a kinematic viscosity of 20 to 50 mm at 40°C. 2 / s dimethyl silicone oil can promote the mixing of fluorides and / or hydrocarbons to obtain a coolant composition with low kinematic viscosity, high open flash point, large specific heat capacity, large breakdown voltage and good copper corrosion rating.

[0080] Accordingly, the present application also provides a method for preparing the aforementioned coolant composition, comprising the following steps: providing raw materials according to the components of the aforementioned coolant composition; and heating and mixing the raw materials to obtain the coolant composition. The components may be added in any order.

[0081] The preparation method has simple process and low production cost, can promote the mixing of the components in the coolant composition, and obtain a coolant composition with low kinematic viscosity, high open flash point, large specific heat capacity, large breakdown voltage and good copper corrosion rating.

[0082] In some embodiments, the mixing temperature in the above preparation method is 40-80°C, exemplified by 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, 60°C, 70°C, 75°C, and 80°C.

[0083] In some embodiments, the mixing time in the above preparation method is 2 to 12 hours, illustratively such as 2 hours, 2.25 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours, 4.5 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 9.5 hours, 10 hours, 10.5 hours, 11 hours, and 12 hours.

[0084] For reference, when the above-mentioned coolant composition is restored to room temperature during preparation, the liquid is clear and transparent with no phase separation interface, which is conducive to forming a uniform and stable coolant composition.

[0085] Accordingly, the coolant composition provided in the embodiments of the present application or the coolant composition provided by the preparation method described in the embodiments of the present application can also be used in the application of an immersion liquid cooling heat dissipation system, which can provide an efficient heat dissipation method and can effectively control the temperature of the device to improve the energy efficiency and performance of the device, wherein the heat dissipation system includes a liquid reservoir for containing the coolant, a circulation system, and a heat exchange system. In actual application, the heating element (such as a server chipset, a lithium battery module, an inverter, a cable connector, a power module, a charging gun power module, etc.) is immersed in the coolant in the reservoir, and the heat generated by the heating element can be transferred to the coolant through phase change / convection, and then the coolant is driven by the circulation system components such as a pump to circulate in the pipeline, and the heat in the coolant is dissipated to the external environment through the heat exchange system, and the cooled coolant is returned to the reservoir.

[0086] In some specific embodiments, the heat dissipation system includes a chip heat dissipation system, a server heat dissipation system, a data center heat dissipation system, an energy storage heat dissipation system, or a new energy vehicle thermal management system. For example, the above-mentioned coolant composition is added to a closed system containing a heating element (server) of a data center heat dissipation system, absorbs heat through vaporization phase change, and takes away the heat generated during the operation of the server. The vaporized coolant gas exchanges heat with the heat exchange system (heat exchanger and external spray air cooling system), and then re-liquefies and returns to the closed system of the server. The coolant with high heat exchange efficiency can effectively control the temperature of the equipment to improve the energy efficiency and performance of the equipment. As one of the core control points of the immersion liquid cooling heat dissipation system, the properties of the above-mentioned coolant can directly affect the specifications and performance of the heat dissipation system, the life of the equipment, and the comprehensive cost. Among them, low viscosity is conducive to reducing the power consumption of the circulation pump, high flash point is conducive to meeting the fire protection requirements of the system, and excellent electrical insulation is conducive to direct contact with high-voltage components.

[0087] In addition, embodiments of the present application further provide an immersion cooling device comprising a liquid reservoir containing the coolant composition provided in the embodiments of the present application or the coolant composition prepared by the methods described in the embodiments of the present application. The liquid reservoir can be a closed metal / composite tank, specifically made of stainless steel, aluminum alloy, plastic, etc., and includes a rack-mounted sealed tank, a battery pack-integrated liquid cooling box, a container-mounted large liquid storage tank, and a gun-body-integrated micro-liquid storage chamber.

[0088] The features and performance of the present application are further described in detail below with reference to specific examples.

[0089] Example

[0090] Example 1

[0091] This embodiment provides a coolant composition comprising the following components in parts by weight:

[0092]

[0093] Preparation method: After weighing according to the above formula, hydrogenated dimerdecene, Group II base oil 200N, and Group III base oil are added to a reactor, stirred and mixed at 40-80°C for 2-12 hours, and after returning to room temperature, the liquid is clear and transparent with no phase separation interface to obtain a coolant composition.

[0094] Example 2

[0095] This embodiment provides a coolant composition comprising the following components in parts by weight:

[0096]

[0097] Preparation method: After weighing according to the above formula, hydrogenated dimerdecene, Group II base oil 200N, and Group III base oil are added to a reactor, stirred and mixed at 40-80°C for 2-12 hours, and after returning to room temperature, the liquid is clear and transparent with no phase separation interface to obtain a coolant composition.

[0098] Example 3

[0099] This embodiment provides a coolant composition comprising the following components in parts by weight:

[0100]

[0101] Preparation method: After weighing according to the above formula, hydrogenated dimerdecene, Group II base oil 100N, Group III base oil, and 2,6-di-tert-butyl-p-cresol are added to a reactor, and stirred and mixed at 40-80°C for 2-12 hours. After returning to room temperature, when the liquid is clear and transparent with no phase separation interface, a coolant composition is obtained.

[0102] Example 4

[0103] This embodiment provides a coolant composition comprising the following components in parts by weight:

[0104]

[0105] Preparation method: After weighing according to the above formula, hydrogenated didecene, Group II base oil 100N, Group III base oil, dimethyl silicone oil, and 2,4-dimethyl-6-tert-butylphenol are added to a reaction kettle, and stirred and mixed at 40-80°C for 2-12 hours. After returning to room temperature, the liquid is clear and transparent with no phase separation interface to obtain a coolant composition.

[0106] Example 5

[0107] This embodiment provides a coolant composition comprising the following components in parts by weight:

[0108]

[0109] Preparation method: After weighing according to the above formula, hydrogenated dimerdecene, Class II base oil 100N, Class III base oil, tetrahydrofluoroether HFE347, 2,4-dimethyl-6-tert-butylphenol, and polyisobutylene succinimide are added to a reactor, and stirred and mixed at 40-80°C for 2-12 hours. After returning to room temperature, the liquid is clear and transparent with no phase interface to obtain a coolant composition.

[0110] Note: Tetrafluoroethane HFE347 is 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether.

[0111] Example 6

[0112] This embodiment provides a coolant composition comprising the following components in parts by weight:

[0113]

[0114] Preparation method: After weighing according to the above formula, hydrogenated didecene, Group II base oil 100N, Group III base oil, pentacarbon hydrofluoroether HFE449, dimethyl silicone oil, dinonyldiphenylamine, and polyisobutylene succinimide are added to a reactor, and stirred and mixed at 40-80°C for 2-12 hours. After returning to room temperature, the liquid becomes clear and transparent with no phase interface to obtain a coolant composition.

[0115] Note: Pentafluorohydroether HFE449 is 1,1,2,3,3,3-hexafluoropropyl-2,2,2-trifluoroethyl ether.

[0116] Example 7

[0117] This embodiment provides a coolant composition comprising the following components in parts by weight:

[0118]

[0119]

[0120] Preparation method: After weighing according to the above formula, hydrogenated didecene, Group II base oil 100N, Group III base oil, methyl-terminated fluorosilicone oil, dimethyl silicone oil, and dinonyldiphenylamine are added to a reaction kettle, and stirred at 40-80°C for 2-12 hours. After returning to room temperature, the liquid becomes clear and transparent with no phase separation interface to obtain a coolant composition.

[0121] Example 8

[0122] This embodiment provides a coolant composition comprising the following components in parts by weight:

[0123]

[0124] Preparation method: After weighing according to the above formula, hydrogenated didecene, Class II base oil 100N, Class III base oil, methyl-terminated fluorosilicone oil, tetracarbon hydrofluoroether HFE347, dimethyl silicone oil, dinonyldiphenylamine, and polyisobutylene succinimide are added to a reactor, stirred and mixed at 40-80°C for 2-12 hours, and after returning to room temperature, the liquid is clear and transparent with no phase interface to obtain a coolant composition.

[0125] Note: Tetrafluoroethane HFE347 is 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether.

[0126] Comparative Example

[0127] The specific components selected in the coolant compositions of Comparative Examples 1-4 are the same as those of Example 8, except for the number of parts of the components.

[0128] Comparative Example 1

[0129] This comparative example provides a coolant composition comprising the following components in parts by weight:

[0130]

[0131] Preparation method: After weighing according to the above formula, hydrogenated didecene, Class II base oil 100N, Class III base oil, methyl-terminated fluorosilicone oil, tetracarbon hydrofluoroether HFE347, dimethyl silicone oil, dinonyldiphenylamine, and polyisobutylene succinimide are added to a reactor, stirred and mixed at 40-80°C for 2-12 hours, and after returning to room temperature, the liquid is clear and transparent with no phase interface to obtain a coolant composition.

[0132] Note: Tetrafluoroethane HFE347 is 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether.

[0133] Comparative Example 2

[0134] This comparative example provides a coolant composition comprising the following components in parts by mass:

[0135]

[0136] Preparation method: After weighing according to the above formula, hydrogenated didecene, Class II base oil 100N, Class III base oil, methyl-terminated fluorosilicone oil, tetracarbon hydrofluoroether HFE347, dimethyl silicone oil, dinonyldiphenylamine, and polyisobutylene succinimide are added to a reactor, stirred and mixed at 40-80°C for 2-12 hours, and after returning to room temperature, the liquid is clear and transparent with no phase interface to obtain a coolant composition.

[0137] Note: Tetrafluoroethane HFE347 is 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether.

[0138] Comparative Example 3

[0139] This comparative example provides a coolant composition comprising the following components in parts by mass:

[0140]

[0141] Preparation method: After weighing according to the above formula, add Class II base oil 100N, Class III base oil, methyl-terminated fluorosilicone oil, tetrahydrofluoroether HFE347, dimethyl silicone oil, dinonyldiphenylamine, and polyisobutylene succinimide into a reactor, stir and mix at 40-80°C for 2-12 hours, and after returning to room temperature, when the liquid is clear and transparent with no phase interface, a coolant composition is obtained.

[0142] Note: Tetrafluoroethane HFE347 is 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether.

[0143] Comparative Example 4

[0144] This comparative example provides a coolant composition comprising the following components in parts by mass:

[0145]

[0146]

[0147] Preparation method: After weighing according to the above formula, hydrogenated didecene, Group II base oil 100N, methyl-terminated fluorosilicone oil, tetracarbon hydrofluoroether HFE347, dimethyl silicone oil, dinonyldiphenylamine, and polyisobutylene succinimide are added to a reactor, stirred and mixed at 40-80°C for 2-12 hours, and after returning to room temperature, the liquid becomes clear and transparent with no phase separation interface to obtain a coolant composition.

[0148] Note: Tetrafluoroethane HFE347 is 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether.

[0149] Performance Testing

[0150] According to the kinematic viscosity determination method (GB / T 265), the open flash point determination method (GB / T 3536), the breakdown voltage determination method (GB / T 507), the specific heat capacity determination method (ASTM E1269), and the copper sheet corrosion test method (GB / T 5096), the performance tests of the coolant compositions provided in Examples 1-8 and Comparative Examples 1-4 were performed. The specific results are shown in Table 1:

[0151] Table 1 Performance test results

[0152]

[0153] According to the performance test results in Table 1:

[0154] (1) The coolant composition of each embodiment of the present application has a large breakdown voltage, a good copper corrosion rating at 100°C for 3 hours, good electrical insulation and strong metal compatibility, which is beneficial for the working fluid to directly contact the equipment in the immersion liquid cooling system. At the same time, it has a high open flash point, which improves safety during application; it has a low viscosity at 40°C, good fluidity, and a large specific heat capacity, which is beneficial for maintaining stable heat transfer efficiency and improving heat exchange performance. The present application prepares a coolant composition with a high flash point, large specific heat capacity, low kinematic viscosity, large breakdown voltage, and good copper corrosion rating by mixing Class II base oil, Class III base oil and hydrogenated didecene. It takes into account the common requirements of immersion liquid cooling and heat dissipation systems (good safety, heat exchange performance, fluidity, electrical insulation and metal compatibility), which is beneficial for reducing costs;

[0155] (2) Compared with Comparative Examples 1 and 2, Examples 1-8 of the present application control the mass ratio of Class II base oil and hydrogenated dimerized decene (the mass ratio of hydrogenated dimerized decene to Class II base oil is 5:1 to 3:4), so that the specific heat capacity of the working fluid is maintained at above 1900 J / (kg·℃) at a relatively stable high open flash point, thereby improving the heat exchange capacity of the liquid cooling system while ensuring good safety. Compared with Example 8, Comparative Example 3 uses Class II base oil instead of hydrogenated dimerized decene, but the open flash point is still low, its safety performance is poor, and its metal compatibility is also reduced, which is not conducive to extending the service life. Compared with Example 8, Comparative Example 4 has a higher viscosity of the coolant composition without adding Class III base oil, its flow performance is poor, and its specific heat capacity is relatively low, and its heat transfer performance is poor.

[0156] (3) Compared with Examples 1 and 2, under the premise of taking into account the common requirements of immersion liquid cooling and heat dissipation systems, Examples 3-8 of the present application provide a method for enhancing the required performance of the coolant composition described in the present application by adding any one or more components such as dispersants, antioxidants, methyl-terminated fluorosilicone oils, hydrofluoroethers (tetracarbon hydrofluoroethers and / or pentacarbon hydrofluoroethers), and dimethyl silicone oils.

[0157] The embodiments described above are merely optional embodiments of the present application and are not intended to limit the scope of protection of the present application. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the technical principles of the present application, and these improvements and modifications should also be regarded as within the scope of protection of the present application.

Claims

1. A coolant composition, characterized in that The invention comprises the following components in parts by mass: 30 to 50 parts of hydrogenated dimerized decene, 10 to 40 parts of group II base oil and 10 to 40 parts of group III base oil.

2. The coolant composition according to claim 1, characterized in that The Class II base oil includes any one or more of Class II base oil 100N, Class II base oil 150N or Class II base oil 200N.

3. The coolant composition according to claim 1 or 2, characterized in that The kinematic viscosity of the Class III base oil at 40°C is 5-6 mm 2 / s, the open flash point of the Group III base oil is greater than or equal to 190°C.

4. The coolant composition according to any one of claims 1 to 3, characterized in that The coolant composition further comprises any one or more components selected from a dispersant, an antioxidant, a methyl-terminated fluorosilicone oil, a hydrofluoroether or a dimethyl silicone oil; and the hydrofluoroether is selected from any one or more of tetracarbon hydrofluoroether or pentacarbon hydrofluoroether.

5. The coolant composition according to claim 4, characterized in that In parts by mass, the dispersant is no more than 0.1 parts, the antioxidant is no more than 0.1 parts, the methyl-terminated fluorosilicone oil is no more than 10 parts, the hydrofluoroether is no more than 5 parts, and the dimethyl silicone oil is no more than 5 parts.

6. The coolant composition according to claim 4, characterized in that The dispersant includes polyisobutylene succinimide; the antioxidant includes any one or more of dinonyldiphenylamine, 2,6-di-tert-butyl-p-cresol or 2,4-dimethyl-6-tert-butylphenol.

7. The coolant composition according to claim 4, characterized in that The kinematic viscosity of the methyl terminated fluorosilicone oil at 40°C is 50-100 mm 2 / s; the hydrofluoroether is selected from any one or more of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, 1,1,2,2-tetrafluoroethyl ethyl ether, 1,1,2,3,3,3-hexafluoropropyl-2,2,2-trifluoroethyl ether or 1,1,1,2,3,3,3-hexafluoropropyl ethyl ether; the kinematic viscosity of the dimethyl silicone oil at 40°C is 20 to 50 mm 2 / s.

8. A method for preparing a coolant composition, characterized in that: The method comprises the following steps: providing raw materials according to the components of the coolant composition according to any one of claims 1 to 7; and heating and mixing the raw materials to obtain the coolant composition.

9. Application of a coolant composition for an immersion liquid cooling system, characterized in that: The coolant composition is a coolant composition according to any one of claims 1 to 7 or a coolant composition prepared according to the preparation method according to claim 8, and the heat dissipation system includes a chip heat dissipation system, a server heat dissipation system, a data center heat dissipation system, an energy storage heat dissipation system or a new energy vehicle thermal management system.

10. An immersion cooling device, characterized in that: The device comprises a liquid reservoir, which is used to contain the coolant composition according to any one of claims 1 to 7 or the coolant composition prepared by the preparation method according to claim 8.

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