A coolant composition, a method of preparation and use thereof

Abstract

The application relates to the technical field of liquid cooling, and discloses a cooling liquid composition, a preparation method and application thereof; the cooling liquid composition comprises the following components in mass fractions: 8-20 parts of a first base oil, 5-20 parts of a second base oil, 70-90 parts of an ester base oil, 0.1-0.5 parts of a pour point depressant and 0.1-0.2 parts of an antioxidant; the first base oil, the second base oil, the ester base oil, the pour point depressant and the antioxidant are matched with each other at specific dosages, have a low viscosity at 40 DEG C, good fluidity, a high open flash point, improved safety in application, a large specific heat capacity, are favorable for maintaining stable heat transfer efficiency, improve the heat conduction performance, and can effectively cool a data center, an energy storage system or a new energy charging gun.

Description

Technical Field

[0001] This application relates to the field of liquid cooling technology, and in particular to a coolant composition, preparation method and application thereof. Background Technology

[0002] The development trends of data centers, energy storage systems, and new energy charging gun cooling technologies all show a pursuit of high efficiency, energy saving, environmental protection, and intelligence.

[0003] Immersion cooling technology is a cooling technique that uses a liquid as the heat transfer medium, immersing the heating element completely or partially in the liquid, allowing the heating element to directly contact the working fluid and exchange heat. Because the heating element is in direct contact with the working fluid, the heat dissipation efficiency is higher and the noise is lower.

[0004] Data centers, energy storage systems, and new energy charging guns all generate heat during operation. Better heat dissipation is essential for their optimal performance, and immersion cooling technology is employed to achieve liquid cooling of these heat-generating components. However, the coolants used in immersion liquid cooling technology have high viscosity, and their cooling effect needs improvement, which is a pressing technical problem to be solved. Therefore, it is necessary to develop a coolant composition with lower viscosity, higher specific heat capacity, and higher open flash point to improve cooling efficiency. Summary of the Invention

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions: In a first aspect, this application provides a coolant composition comprising the following components in parts by weight: 8-20 parts of a first base oil, 5-20 parts of a second base oil, 70-90 parts of an ester base oil, 0.1-0.5 parts of a pour point depressant, and 0.1-0.2 parts of an antioxidant; The primary base oil is a mixture of straight-chain or branched C16-C50 alkanes, and its kinematic viscosity at 40°C is 3.0-4.0 mm. 2 / s; the second base oil is a mixture of straight-chain, branched, or cyclic C18-C50 alkanes, and its kinematic viscosity at 40°C is 6.4-7.8 mm. 2 / s; The ester base oil is a monoester formed from a monobasic fatty acid and a monohydric alcohol, with a total number of carbon atoms of 18 to 22; the monobasic fatty acid has 8 to 16 carbon atoms, and the monohydric alcohol has 4 to 12 carbon atoms.

[0006] Based on this scheme, by combining the first base oil, the second base oil, ester base oil, pour point depressant, and antioxidant in specific amounts, a solution exhibits low viscosity and good fluidity at 40°C, while also possessing a high open-cup flash point, enhancing safety during application. Furthermore, it has a large specific heat capacity, which helps maintain stable heat transfer efficiency and improves thermal conductivity, effectively cooling data centers, energy storage systems, or new energy charging guns. Simultaneously, the pour point depressant alters the shape, size, and quantity of wax crystals through eutectic or adsorption, inhibiting the formation of a crystal network in the coolant composition and maintaining coolant flow. The antioxidant provides antioxidant properties, reducing oxidation of the coolant composition.

[0007] In some embodiments of this application, the coolant composition comprises 8-20 parts of a first base oil, 5-20 parts of a second base oil, 70-90 parts of an ester base oil, 0.1-0.5 parts of a pour point depressant, and 0.1-0.2 parts of an antioxidant.

[0008] Based on this scheme, by combining the first base oil, the second base oil, ester base oil, pour point depressant, and antioxidant in specific amounts, a solution exhibits low viscosity and good fluidity at 40°C, while also possessing a high open-cup flash point, enhancing safety during application. Furthermore, it has a large specific heat capacity, which helps maintain stable heat transfer efficiency and improves thermal conductivity, effectively cooling data centers, energy storage systems, or new energy charging guns. Simultaneously, the pour point depressant alters the shape, size, and quantity of wax crystals through eutectic or adsorption, inhibiting the formation of a crystal network in the coolant composition and maintaining coolant flow. The antioxidant provides antioxidant properties, reducing oxidation of the coolant composition.

[0009] In some embodiments of this application, the coolant composition comprises the following components in parts by weight: 0.5 to 20 parts of a first base oil, 0.5 to 20 parts of a second base oil, 70 to 90 parts of an ester base oil, 0.1 to 0.5 parts of a pour point depressant, and 0.1 to 0.2 parts of an antioxidant.

[0010] Based on this scheme, by combining the first base oil, the second base oil, ester base oil, pour point depressant, and antioxidant in specific amounts, a solution exhibits low viscosity and good fluidity at 40°C, while also possessing a high open-cup flash point, enhancing safety during application. Furthermore, it has a large specific heat capacity, which helps maintain stable heat transfer efficiency and improves thermal conductivity, effectively cooling data centers, energy storage systems, or new energy charging guns. Simultaneously, the pour point depressant alters the shape, size, and quantity of wax crystals through eutectic or adsorption, inhibiting the formation of a crystal network in the coolant composition and maintaining coolant flow. The antioxidant provides antioxidant properties, reducing oxidation of the coolant composition.

[0011] In some embodiments of this application, the coolant composition comprises 0.5 to 20 parts of a first base oil, 0.5 to 20 parts of a second base oil, 70 to 90 parts of an ester base oil, 0.1 to 0.5 parts of a pour point depressant, and 0.1 to 0.2 parts of an antioxidant.

[0012] Based on this scheme, by combining the first base oil, the second base oil, ester base oil, pour point depressant, and antioxidant in specific amounts, a solution exhibits low viscosity and good fluidity at 40°C, while also possessing a high open-cup flash point, enhancing safety during application. Furthermore, it has a large specific heat capacity, which helps maintain stable heat transfer efficiency and improves thermal conductivity, effectively cooling data centers, energy storage systems, or new energy charging guns. Simultaneously, the pour point depressant alters the shape, size, and quantity of wax crystals through eutectic or adsorption, inhibiting the formation of a crystal network in the coolant composition and maintaining coolant flow. The antioxidant provides antioxidant properties, reducing oxidation of the coolant composition.

[0013] In some embodiments of this application, the first base oil has an open-cup flash point greater than or equal to 144°C and a specific heat capacity of 2.2~2.4 kJ / kg·K; the second base oil has an open-cup flash point greater than or equal to 185°C and a specific heat capacity of 2.1~2.3 kJ / kg·K; and the ester base oil has a kinematic viscosity of 4.0~6.0 mm at 40°C. 2 / s.

[0014] Based on this solution, the coolant composition in the embodiments of this application can be further made to have a lower kinematic viscosity at 40°C, and a higher open flash point and specific heat capacity, thereby improving the cooling performance of the composition in application.

[0015] In some embodiments of this application, the first base oil is DowSyn 270, the second base oil is Cargill EF3446, and the ester base oil is isooctyl laurate.

[0016] Based on this solution, the coolant composition in the embodiments of this application can be further made to have a relatively high open flash point, improve its thermal oxidation stability and hydrolytic stability, and reduce its low-temperature viscosity.

[0017] In some embodiments of this application, the pour point depressant is selected from one or more of polyacrylate, polymethacrylate, ethylene-vinyl acetate copolymer, polystyrene-maleate copolymer, and polystyrene.

[0018] Based on this scheme, the pour point depressant can inhibit the formation of crystal networks in the coolant composition, lower the pour point of the coolant composition, and maintain coolant flow.

[0019] In some embodiments of this application, the coolant composition further includes a nano-phase change material; the nano-phase change material is a metal-organic framework polymer-based phase change material MOPPoly PCM; the nano-phase change material is 0.05 to 0.15 parts by mass.

[0020] In some embodiments of this application, the coolant composition comprises 0.5 to 20 parts of a first base oil, 0.5 to 20 parts of a second base oil, 70 to 90 parts of an ester base oil, 0.1 to 0.5 parts of a pour point depressant, 0.1 to 0.2 parts of an antioxidant, and 0.08 to 0.12 parts of a nano-phase change material.

[0021] Based on this scheme, nano-phase change materials can undergo phase change at a specific temperature, absorbing or releasing heat.

[0022] In some embodiments of this application, the coolant composition further includes a composite additive, which is two or more of antioxidants, anti-wear agents, dispersants, preservatives, and stabilizers; the composite additive is 0.4 to 0.6 parts by weight.

[0023] In some embodiments of this application, the coolant composition comprises 0.5 to 20 parts of a first base oil, 0.5 to 20 parts of a second base oil, 70 to 90 parts of an ester base oil, 0.1 to 0.5 parts of a pour point depressant, 0.1 to 0.2 parts of an antioxidant, 0.08 to 0.12 parts of a nano-phase change material, and / or 0.4 to 0.6 parts of a composite additive.

[0024] Based on this solution, the composite additive can form a protective film, reduce metal oxidation and corrosion, and further improve the overall performance of the coolant composition.

[0025] In some embodiments of this application, the antioxidant is N-phenyl-1-naphthylamine or nonyl-N-(nonylphenyl)aniline; the anti-wear agent is a long-chain alkenylamide; the dispersant is β-methylnaphthalene or α-methylnaphthalene; and the preservative is 4-methyl-1-naphthylamine. H -benzotriazole or 5-methyl-1 H - benzotriazole.

[0026] Based on this solution, the composite additive can form a protective film, reduce metal oxidation and corrosion, and further improve the overall performance of the coolant composition.

[0027] In some embodiments of this application, the components include the following by weight: 10-17 parts of first base oil, 5-15 parts of second base oil, 70-80 parts of ester base oil, 0.1-0.4 parts of pour point depressant, 0.13-0.18 parts of antioxidant, 0.08-0.12 parts of nano-phase change material and / or 0.4-0.5 parts of composite additive.

[0028] Based on this solution, the coolant composition in the embodiments of this application can be further made to have a lower kinematic viscosity at 40°C, and a higher open flash point and specific heat capacity, thereby improving the cooling performance of the composition in application.

[0029] Secondly, this application also provides a method for preparing a coolant composition, the method comprising: providing raw materials according to the components of the coolant composition described in the first aspect; heating and mixing the raw materials uniformly to obtain the coolant composition.

[0030] Based on this scheme, the process is simple and the production cost is low. It can promote the mixing of various components in the coolant composition and obtain a coolant composition that takes into account both low kinematic viscosity, high open flash point and specific heat capacity.

[0031] In some embodiments of this application, the preparation method includes: mixing a first base oil, a second base oil, an ester base oil, a pour point depressant, and an antioxidant under heating conditions to obtain a coolant composition.

[0032] Based on this scheme, the process is simple and the production cost is low. It can promote the mixing of the first base oil, the second base oil, the ester base oil, the pour point depressant and the antioxidant in the coolant composition, so as to obtain a coolant composition that takes into account both low kinematic viscosity, high open flash point and specific heat capacity.

[0033] In some embodiments of this application, the preparation method includes: mixing a first base oil, a second base oil, an ester base oil, a pour point depressant, an antioxidant, an optional nano-phase change material, and an optional composite additive under heating conditions to obtain a coolant composition.

[0034] Based on this scheme, the process is simple and the production cost is low. It can promote the mixing of the first base oil, the second base oil, the ester base oil, the pour point depressant, the antioxidant, the optional nano-phase change material and the optional composite additive in the coolant composition, so as to obtain a coolant composition that takes into account both low kinematic viscosity, high open flash point and specific heat capacity.

[0035] In some embodiments of this application, the heating temperature in the preparation method is 40~60°C, and the mixing time is 40~60 minutes.

[0036] Based on this scheme, after the mixed 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.

[0037] Thirdly, this application also provides an application of the coolant composition described in the first aspect or the coolant composition obtained by the preparation method described in the second aspect for cooling data centers, energy storage systems or new energy charging guns. Detailed Implementation

[0038] The technical solutions in the embodiments of this application will be described below. It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] First, the application scenarios of this application embodiment are introduced. In a closed system for cooling data centers, energy storage systems, or new energy charging guns, heat-generating components (such as server chipsets, lithium battery modules, inverters, cable connectors, power modules, charging gun power modules, etc.) are immersed in the coolant composition provided in this application embodiment. The heat generated by the heat-generating components is transferred to the coolant through phase change / convection, and then the coolant is driven by circulation system components such as pumps to circulate in the pipes. The heat in the coolant is dissipated to the external environment through the heat exchange system, and the cooled coolant returns to the reservoir.

[0040] The following provides a detailed description of the coolant composition, preparation method, and application provided in the embodiments of this application.

[0041] Unless otherwise specified, the experimental methods used in the embodiments of this application are all conventional methods; unless otherwise specified, the materials and reagents used are all commercially available.

[0042] In the embodiments of this application, the terms "a" or "an" are used to describe the elements and components described in this application. This is done merely for convenience and to provide a general meaning for the scope of this application. This description should be understood to include one or at least one, and the singular also includes the plural, unless clearly otherwise indicated. "Multiple" means two or more.

[0043] In the embodiments of this application, the terms "comprising," "including," "having," "containing," or any other variations thereof are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may also include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0044] In the embodiments of this application, the terms "optionally", "optionally", "optional", "optional" or "any one" as used mean that the matter or event described thereafter may or may not occur, and the description includes both the occurrence of the event and the non-occurrence of the event.

[0045] In the embodiments of this application, the term "not exceeding" means that it includes or covers the upper limit value described thereafter.

[0046] In the embodiments of this application, unless otherwise specified, the numerical range "a~b" represents an abbreviated representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "5~10" means that all real numbers between "5~10" have been listed in this document, and "5~10" is just an abbreviated representation of these numerical combinations.

[0047] In the embodiments of this application, the terms "kinematic viscosity" and "kinematic viscosity" are the same concept and can be used interchangeably, and their unit is "mm". 2 / s" or "cSt", 1 mm 2 / s = 1 cSt.

[0048] The term "C16-C50 alkanes" refers to alkanes having 16 to 50 carbon atoms. Optionally, C16-C50 alkanes include C16 alkanes, C17 alkanes, C18 alkanes, C19 alkanes, C20 alkanes, C25 alkanes, C30 alkanes, C35 alkanes, C40 alkanes, C45 alkanes, C50 alkanes, or any combination of two of these options.

[0049] The term "mixture of C16-C50 alkanes" refers to a mixture of two or more C16-C50 alkanes. These two or more C16-C50 alkanes may have the same number of carbon atoms or different numbers of carbon atoms. For example, the two or more C16-C50 alkanes may be a mixture of straight-chain C16 alkanes with 16 carbon atoms and branched C16 alkanes, or a mixture of C16 alkanes with 16 carbon atoms and C17 alkanes with 17 carbon atoms, but are not limited thereto.

[0050] The term "straight-chain or branched C16-C50 alkanes" refers to one or more of straight-chain C16-C50 alkanes and branched C16-C50 alkanes.

[0051] The term "C18~C50 alkanes" refers to alkanes having 18 to 50 carbon atoms.

[0052] The term "mixture of C18-C50 alkanes" refers to a mixture of two or more C18-C50 alkanes. These two or more C18-C50 alkanes may have the same number of carbon atoms or different numbers of carbon atoms. For example, the two or more C18-C50 alkanes may be a mixture of straight-chain C18 alkanes with 18 carbon atoms and branched C18 alkanes, or a mixture of C18 alkanes with 18 carbon atoms and C19 alkanes with 19 carbon atoms, but are not limited thereto.

[0053] The term "straight-chain, branched or cyclic C18-C50 alkane" refers to one or more of straight-chain C18-C50 alkane, branched C18-C50 alkane, or cyclic C18-C50 alkane.

[0054] In this embodiment, the operation of the liquid cooling medium in the heat dissipation system requires 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, the safety of the liquid cooling medium also needs to be considered due to the flammable and explosive properties of oil, and its corresponding index is flash point. The essence of liquid cooling medium heat dissipation is to remove heat from the equipment to control the temperature rise of the system, and its heat exchange capacity is corresponding to the index of specific heat capacity.

[0055] The development trends of data centers, energy storage systems, and new energy charging gun cooling technologies all show a pursuit of high efficiency, energy saving, environmental protection, and intelligence.

[0056] This application provides a coolant composition that meets the higher requirements of industries such as data centers, energy storage, and new energy fast charging for immersion liquid cooling systems, while taking into account indicators such as fluidity, safety, and thermal conductivity, and can better meet the performance requirements of coolants in multiple application scenarios.

[0057] The following provides a detailed description of the coolant composition, preparation method, and application provided in the embodiments of this application.

[0058] This application provides a coolant composition comprising the following components in parts by weight: 0.5 to 20 parts of a first base oil, 0.5 to 20 parts of a second base oil, 70 to 90 parts of an ester base oil, 0.1 to 0.5 parts of a pour point depressant, and 0.1 to 0.2 parts of an antioxidant.

[0059] In some embodiments of this application, the composition comprises the following components in parts by weight: 8-20 parts of a first base oil, 5-20 parts of a second base oil, 70-90 parts of an ester base oil, 0.1-0.5 parts of a pour point depressant, and 0.1-0.2 parts of an antioxidant; The first base oil is a mixture of straight-chain or branched C16-C50 alkanes, and its kinematic viscosity at 40°C is 3.0-4.0 mm. 2 / s; the second base oil is a mixture of straight-chain, branched, or cyclic C18-C50 alkanes, and the kinematic viscosity of the second base oil at 40°C is 6.4-7.8 mm. 2 / s; The kinematic viscosity of the ester base oil at 40°C is 4.0~6.0 mm. 2 / s, wherein the ester base oil is isooctyl laurate.

[0060] In some specific embodiments, the coolant composition may consist of 8-20 parts of a first base oil, 5-20 parts of a second base oil, 70-90 parts of an ester base oil, 0.1-0.5 parts of a pour point depressant and 0.1-0.2 parts of an antioxidant.

[0061] Wherein, according to the mass parts of the components in the coolant composition: Optionally, the first base oil can be 0.5 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, or 20 parts. Optionally, the second base oil can be 0.5 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, or 20 parts; Optionally, the ester base oil can be 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts, 76 parts, 77 parts, 78 parts, 79 parts, 80 parts, 81 parts, 82 parts, 83 parts, 84 parts, 85 parts, 86 parts, 87 parts, 88 parts, 89 parts, or 90 parts; Optionally, the pour point depressant can be 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, or 0.5 parts; Optionally, the antioxidant can be 0.1 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, 0.16 parts, 0.17 parts, 0.18 parts, 0.19 parts, or 0.2 parts; First base oil The coolant composition of this application comprises 8 to 20 parts by weight of a first base oil. Optionally, the first base oil may be 10 to 17 parts by weight of the coolant composition, and optionally 17 parts.

[0062] The first base oil comprises a mixture of straight-chain or branched C16-C50 alkanes.

[0063] In some specific embodiments, the kinematic viscosity of the first base oil at 40°C is 3.0~4.0 mm. 2 / s. Optionally, the kinematic viscosity of the first base oil at 40°C can be 3.0 mm. 2 / s, 3.1mm 2 / s, 3.2mm 2 / s, 3.3mm 2 / s, 3.4mm 2 / s, 3.5mm 2 / s, 3.6mm2 / s, 3.7mm 2 / s, 3.8mm 2 / s, 3.9mm 2 / s, 4.0mm 2 / s or a range consisting of any two values.

[0064] The open-cup flash point of the first base oil can be above 144℃, optionally between 144℃ and 174℃. Optionally, the open-cup flash point of the first base oil can be 144℃, 146℃, 148℃, 150℃, 155℃, 160℃, 165℃, 170℃, 174℃, or any range of two values.

[0065] The specific heat capacity of the first base oil can be 2.2~2.4 kJ / kg·K. Optionally, the specific heat capacity of the first base oil can be 2.2 kJ / kg·K, 2.3 kJ / kg·K, 2.4 kJ / kg·K, or any range of two values.

[0066] Furthermore, the primary base oil was DowSyn 270, purchased from Shanghai Daopu Chemical Co., Ltd.

[0067] The primary base oil has low viscosity, high open-cup flash point, good thermal oxidation stability, and good hydrolytic stability, which helps to reduce the low-temperature viscosity of the coolant composition, improve its specific heat performance, and maintain a high open-cup flash point.

[0068] In this document, unless otherwise specified, the kinematic viscosity at 40°C was tested according to ASTM D 445, the open flash point was tested according to GB / T 3536, and the specific heat capacity was tested according to ASTM E1269.

[0069] Second base oil The coolant composition of this application comprises 5 to 20 parts by weight of a second base oil. Optionally, the second base oil may be 5 to 15 parts by weight of the coolant composition, and optionally 10 parts by weight.

[0070] The second base oil comprises a mixture of straight-chain, branched, or cyclic C18-C50 alkanes.

[0071] In some specific embodiments, the kinematic viscosity of the second base oil at 40°C is 6.4~7.8 mm. 2 / s. Optionally, the kinematic viscosity of the second base oil at 40°C can be 6.4 mm. 2 / s, 6.6mm 2 / s, 6.8mm 2 / s, 7.0mm 2 / s, 7.2mm 2 / s, 7.4mm 2 / s, 7.6mm 2 / s, 7.8mm 2 / s or a range consisting of any two values.

[0072] The open-cup flash point of the second base oil can be above 185℃, optionally between 185℃ and 215℃. Optionally, the open-cup flash point of the second base oil can be 185℃, 186℃, 187℃, 188℃, 189℃, 190℃, 195℃, 200℃, 205℃, 210℃, 215℃, or any range of two values.

[0073] The specific heat capacity of the second base oil can be 2.1~2.3 kJ / kg·K. Optionally, the specific heat capacity of the second base oil can be 2.1 kJ / kg·K, 2.2 kJ / kg·K, 2.3 kJ / kg·K, or any range of two values.

[0074] Furthermore, the second base oil can be Cargill EF3446 purchased from Cargill, but is not limited to this.

[0075] Secondary base oil is a low-viscosity fluid with excellent thermal conductivity. It has a high flash point, low viscosity, high boiling point, and low volatility. Secondary base oil also exhibits good heat resistance and oxidation resistance, and is more cost-effective than silicone oils and fluorinated fluids. In coolant compositions, secondary base oil helps to increase the open flash point of the coolant composition.

[0076] Ester base oils The coolant composition of this application comprises 70 to 90 parts by weight of ester base oil. Optionally, the ester base oil may be 70 to 80 parts by weight, and optionally 78.98 parts by weight, based on the mass of the coolant composition.

[0077] Ester base oils refer to oils comprising compounds of the formula R1COOR2, where R1 represents a group derived from a monobasic fatty acid and R2 represents a group derived from a monohydric alcohol, and the total number of carbon atoms in the R1COOR2 compound is 15 to 25. Exemplarily, the monobasic fatty acid is selected from straight-chain, branched, saturated, or unsaturated monobasic fatty acids having 8 to 16 carbon atoms, such as 12 carbon atoms. Exemplarily, the monohydric alcohol is selected from straight-chain, branched, saturated, or unsaturated monohydric alcohols having 4 to 12 carbon atoms, such as 8 carbon atoms.

[0078] Optionally, the ester base oil comprises a compound of formula R1COOR2 with a total number of carbon atoms of 18-22. Alternatively, the ester base oil comprises a compound of formula R1COOR2 with a total number of carbon atoms of 20. In this case, the ester base oil comprises a compound of formula C... 20 H 40 O2 ester compounds.

[0079] In some specific embodiments, the kinematic viscosity of the ester base oil at 40°C is 4.0~6.0 mm. 2 / s. Optionally, the kinematic viscosity of the ester base oil at 40°C can be 4.0 mm. 2 / s, 5.0mm 2 / s, 6.0mm 2 / s or a range consisting of any two values.

[0080] Optionally, the open-cup flash point of the ester base oil can be above 185℃, or optionally between 185℃ and 215℃. Optionally, the open-cup flash point of the ester base oil can be 185℃, 186℃, 187℃, 188℃, 189℃, 190℃, 195℃, 200℃, 205℃, 210℃, 215℃, or any range of two values.

[0081] Optionally, the specific heat capacity of the ester base oil can be 2.0~2.2 kJ / kg·K. Optionally, the specific heat capacity of the ester base oil can be 2.0 kJ / kg·K, 2.1 kJ / kg·K, 2.2 kJ / kg·K, or any range of two values.

[0082] Furthermore, ester base oils include isooctyl laurate or isononyl isononanoate.

[0083] This ester base oil is a low-viscosity synthetic ester base oil with a kinematic viscosity of 4.0~6.0 mm at 40°C. 2 / s, this ester base oil is beneficial for adjusting the kinematic viscosity of the coolant composition at 40°C, increasing its open flash point, and improving its thermal conductivity.

[0084] Pour point depressant The coolant composition of this application includes 0.1 to 0.5 parts by weight of a pour point depressant. Optionally, the amount of pour point depressant added, based on the mass parts of the coolant composition, can be 0.1, 0.2, 0.3, 0.4, 0.5 parts, or any range of two values. Optionally, the amount of pour point depressant added, based on the mass parts of the coolant composition, can be 0.1 to 0.4 parts, and optionally 0.3 parts.

[0085] A pour point depressant is a chemical used to lower the freezing point of a coolant composition. For example, a pour point depressant may be selected from one or more of polyacrylates, polymethyl methacrylates, ethylene-vinyl acetate copolymers, polystyrene-maleic ester copolymers, polystyrene, etc. Optionally, a pour point depressant may be selected from polyacrylates, such as a mineral oil solution of polyacrylate. Alternatively, a pour point depressant may be selected from polymethyl methacrylates, such as a mineral oil solution of polymethyl methacrylate. For example, a pour point depressant may be selected from a mineral oil solution of polymethyl methacrylate.

[0086] Pour point depressants alter the shape, size, and quantity of wax crystals through eutectic or adsorption, inhibiting the formation of a crystal network in the coolant composition and maintaining coolant flow.

[0087] antioxidants The coolant composition of this application includes 0.1 to 0.2 parts by weight of an antioxidant. Optionally, the amount of antioxidant added may be 0.13 to 0.18 parts, and optionally 0.15 parts, by weight of the coolant composition.

[0088] Furthermore, the antioxidant can be IRGANOX® L 57, purchased from BASF.

[0089] Antioxidants can effectively inhibit the oxidation reaction of coolant compositions during use due to high temperature and oxidizing environment, thereby reducing the oxidation of coolant compositions, maintaining the viscosity stability of coolant compositions, and reducing the formation of sludge and varnish.

[0090] Nanophase change materials The coolant composition of this application includes 0.05 to 0.15 parts by weight of nano-phase change material. Optionally, the amount of nano-phase change material added can be 0.08% to 0.12% by weight of the coolant composition, and optionally 0.1%.

[0091] Furthermore, the nano-phase change material can be the metal-organic framework polymer-based phase change material MOPPoly PCM purchased from Suzhou Panji Intelligent Storage Energy Technology Co., Ltd.

[0092] Nanomaterials are materials composed of phase change materials combined with other media materials at the nanoscale. Phase change materials can undergo phase change at specific temperatures, absorbing or releasing heat, which is beneficial for improving the specific heat capacity of the composition.

[0093] Compound additives The coolant composition of this application includes 0.4 to 0.6 parts by weight of a composite additive. Optionally, the amount of composite additive added may be 0.4 to 0.5 parts, and optionally 0.47 parts, by weight of the coolant composition.

[0094] Compound additives refer to compound formulations of two or more additives, which may include two or more of the following: antioxidants, anti-wear agents, dispersants, preservatives, stabilizers, etc.

[0095] The antioxidant is N-phenyl-1-naphthylamine or nonyl-N-(nonylphenyl)aniline; the anti-wear agent is a long-chain alkenylamide; the dispersant is β-methylnaphthalene or α-methylnaphthalene; and the preservative is 4-methyl-1-phenyl-1-phenyl-2 ... H -benzotriazole or 5-methyl-1 H - benzotriazole.

[0096] In some specific embodiments, the composite additive includes: N-phenyl-1-naphthylamine, nonyl-N-(nonylphenyl)aniline, long-chain alkenylamide, β-methylnaphthalene, α-methylnaphthalene, 4- or 5-methyl-1H-benzotriazole, and a polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate.

[0097] In some specific embodiments, the composite additive, by mass percentage, comprises: 15%~25% N-phenyl-1-naphthylamine, 15%~25% nonyl-N-(nonylphenyl)aniline, 10%~15% long-chain alkenylamide, 10%~15% β-methylnaphthalene, 5%~10% α-methylnaphthalene, and 1%~3% 4- or 5-methyl-1-naphthylamine. H 1%~3% of benzotriazole, a polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, and 4%~43% of naphtha, a heavy aromatic solvent.

[0098] In some embodiments, the coolant composition comprises, by weight parts: 10 to 17 parts of a first base oil, 5 to 15 parts of a second base oil, 70 to 80 parts of an ester base oil, 0.1 to 0.5 parts of a pour point depressant, 0.1 to 0.2 parts of an antioxidant, 0.05 to 0.15 parts of a nano-phase change material, and 0.4 to 0.6 parts of a composite additive.

[0099] In some embodiments, the composition comprises, by total weight of the coolant composition, 17 parts of a first base oil, 10 parts of a second base oil, 71.98 parts of an ester base oil, 0.3 parts of a pour point depressant, 0.15 parts of an antioxidant, 0.1 parts of a nano-phase change material, and 0.47 parts of a composite additive.

[0100] N-Phenylacetylamine forms a protective film covering the metal surface, preventing direct contact between the metal and oxygen, thus reducing oxidation and corrosion and providing antioxidant protection. Nonyl-N-(nonylphenyl)aniline effectively inhibits oxidation reactions in the coolant composition during use under high temperature and oxidizing environments, significantly extending the service life of the coolant composition and protecting machinery from corrosion and wear caused by oxidation products. Long-chain alkenylamides form a stable chemical adsorption film on the metal surface, effectively preventing direct contact with the metal surface even under high load and high temperature conditions, thus significantly reducing the coefficient of friction and improving the extreme pressure performance of the coolant composition; they also reduce direct friction between metals, effectively preventing metal wear and extending the service life of machinery. β-Methylnaphthalene and α-methylnaphthalene have good oil solubility and can be uniformly dispersed in the coolant composition, ensuring the stability and uniformity of the additives in the product and improving the overall performance of the coolant composition; they also have antioxidant properties, capturing free radicals in the coolant composition, inhibiting free radical chain reactions, thereby reducing oxidation of the coolant composition, maintaining the viscosity stability of the coolant composition, and reducing the formation of sludge and varnish. 4- or 5-methyl-1H-benzotriazole can adsorb onto metal surfaces, forming a protective film that prevents direct contact between the metal and corrosive media such as oxygen and water vapor in the air, thereby effectively inhibiting metal corrosion and protecting mechanical equipment from corrosion damage. The polymer of ethyl acrylate and 2-ethylhexyl acrylate can significantly improve the viscosity index of coolant compositions, meaning it maintains the stability of the coolant composition's viscosity under temperature changes; under mechanical shear force, this polymer can maintain its structural stability, preventing a significant decrease in the viscosity of the coolant composition.

[0101] Accordingly, this application also provides a method for preparing the above-mentioned coolant composition, the method comprising: heating and mixing the components of the above-mentioned coolant composition until homogeneous to obtain the coolant composition. The order in which the components are added is not important.

[0102] In some specific embodiments, the above preparation method includes: mixing a first base oil, a second base oil, an ester base oil, a pour point depressant, and an antioxidant under heating conditions to obtain a coolant composition. The order in which the components are added is not important.

[0103] In some specific embodiments, the above preparation method includes: mixing a first base oil, a second base oil, an ester base oil, a pour point depressant, an antioxidant, an optional nano-phase change material, and an optional composite additive under heating conditions to obtain a coolant composition. The order in which the components are added is not important.

[0104] Choosing the above preparation method can promote the mixing of various components in the coolant composition, so as to obtain a coolant composition that balances low kinematic viscosity, high open flash point and specific heat capacity.

[0105] In some specific implementations, the heating temperature in the above preparation method is 40~60℃, such as 40℃, 41℃, 42℃, 43℃, 44℃, 45℃, 46℃, 47℃, 48℃, 49℃, 50℃, 51℃, 52℃, 53℃, 54℃, 55℃, 56℃, 57℃, 58℃, 59℃, and 60℃.

[0106] In some specific implementation methods, the mixing time in the above preparation method is 40 to 60 minutes, for example, 40 minutes, 41 minutes, 42 minutes, 43 minutes, 44 minutes, 45 minutes, 46 minutes, 47 minutes, 48 ​​minutes, 49 minutes, 50 minutes, 51 minutes, 52 minutes, 53 minutes, 54 minutes, 55 minutes, 56 minutes, 57 minutes, 58 minutes, 59 minutes, and 60 minutes.

[0107] 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 the formation of a uniform and stable coolant composition.

[0108] Accordingly, the coolant composition provided in this application or the coolant composition prepared by the above-described method can also be used in cooling data centers, energy storage systems, or new energy charging guns. It can provide an efficient heat dissipation method and effectively control equipment temperature to improve equipment energy efficiency and performance. In practical applications, immersing heat-generating components (such as server chipsets, lithium battery modules, inverters, cable connectors, power modules, charging gun power modules, etc.) in the coolant of the reservoir allows the heat generated by the heat-generating components to be transferred to the coolant through phase change / convection. Then, a pump or other circulation system component drives the coolant to circulate within the pipes, dissipating the heat in the coolant to the external environment through a heat exchange system. The cooled coolant then returns to the reservoir.

[0109] In some specific implementations, the coolant composition is used to cool the new energy charging gun. The coolant composition is added to the closed liquid circulation system of the charging gun to effectively control the equipment temperature, thereby improving equipment energy efficiency and performance. The low viscosity, high open flash point, and specific heat capacity of the coolant composition can increase the current or voltage during charging. Therefore, while ensuring safety, the coolant composition reduces the charging time of the charging gun, achieving fast charging requirements.

[0110] The features and performance of this application will be further described in detail below with specific examples.

[0111] Example Example 1 According to the formula shown in Table 1, 17 kg of the first base oil, 10 kg of the second base oil, 71.98 kg of the ester base oil, 0.3 kg of the pour point depressant, and 0.15 kg of the antioxidant were taken and mixed by heating and stirring to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0112] Table 1. Formulation composition of Examples 1-4 The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0113] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57.

[0114] The performance parameters of the first base oil, the second base oil, and isooctyl laurate as an ester base oil in this embodiment were tested. The test methods and results of the performance parameters are shown in Table 2.

[0115] Table 2 Example 2 According to the formula shown in Table 1, 13 kg of the first base oil, 15 kg of the second base oil, 70.98 kg of the ester base oil, 0.3 kg of the pour point depressant, and 0.15 kg of the antioxidant were taken and mixed by heating and stirring to obtain a transparent coolant composition. The heating and stirring temperature was 60℃, and the heating and stirring time was 60 min.

[0116] The first base oil is obtained using the following preparation method: using an olefin oligomerization process, isobutylene is used as the raw material, and the reaction is carried out in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220℃ and a reaction pressure of 8MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. The intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes by hydrogenation cracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 branched alkanes.

[0117] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isononyl isononanoate. The pour point depressant was a mineral oil solution of polymethyl acrylate. The antioxidant was IRGANOX® L 57.

[0118] Example 3 According to the formula shown in Table 1, 10 kg of the first base oil, 10 kg of the second base oil, 78.98 kg of ester base oil, 0.1 kg of pour point depressant, and 0.15 kg of antioxidant were taken and mixed by heating and stirring to obtain a transparent coolant composition. The heating and stirring temperature was 40℃, and the heating and stirring time was 40 min.

[0119] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0120] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was ethylene-vinyl acetate copolymer. The antioxidant was IRGANOX® L 57.

[0121] Example 4 According to the formula shown in Table 1, 15 kg of the first base oil, 5 kg of the second base oil, 78.98 kg of the ester base oil, 0.3 kg of the pour point depressant, and 0.15 kg of the antioxidant were taken and mixed by heating and stirring to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0122] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0123] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was polystyrene-maleic ester copolymer. The antioxidant was IRGANOX® L 57.

[0124] Example 5 According to the formula shown in Table 3, 17 kg of the first base oil, 10 kg of the second base oil, 71.98 kg of ester base oil, 0.3 kg of pour point depressant, 0.15 kg of antioxidant, 0.1 kg of nano-phase change material, and 0.47 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0125] Table 3. Formulation composition of Examples 5-8 The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0126] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57. The nano-phase change material was MOPPoly PCM, purchased from Suzhou Panji Intelligent Storage Energy Technology Co., Ltd.

[0127] The compound additive, by weight percentage, comprises 20% N-phenyl-1-naphthylamine, 20% nonyl-N-(nonylphenyl)aniline, 12.5% ​​long-chain alkenylamide, 12.5% ​​β-methylnaphthalene, 7.5% α-methylnaphthalene, and 2% 4-methyl-1-naphthalene. H - benzotriazole, 2% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 23.5% heavy aromatic solvent naphtha.

[0128] Example 6 According to the formula shown in Table 3, 13 kg of the first base oil, 15 kg of the second base oil, 70.98 kg of ester base oil, 0.3 kg of pour point depressant, 0.15 kg of antioxidant, 0.1 kg of nano-phase change material, and 0.47 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 60℃, and the heating and stirring time was 60 min.

[0129] The first base oil is obtained using the following preparation method: using an olefin oligomerization process, isobutylene is used as the raw material, and the reaction is carried out in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220℃ and a reaction pressure of 8MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. The intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes by hydrogenation cracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 branched alkanes.

[0130] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl acrylate. The antioxidant was IRGANOX® L 57. The nano-phase change material was MOPPoly PCM, purchased from Suzhou Panji Intelligent Storage Energy Technology Co., Ltd.

[0131] The compound additive, by weight percentage, comprises 15% N-phenyl-1-naphthylamine, 15% nonyl-N-(nonylphenyl)aniline, 10% long-chain alkenylamide, 10% β-methylnaphthalene, 5% α-methylnaphthalene, and 1% 4-methyl-1-naphthalene. H - benzotriazole, 1% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 43% heavy aromatic solvent naphtha.

[0132] Example 7 According to the formula shown in Table 3, 10 kg of the first base oil, 10 kg of the second base oil, 78.98 kg of ester base oil, 0.1 kg of pour point depressant, 0.15 kg of antioxidant, 0.1 kg of nano-phase change material, and 0.47 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 40℃, and the heating and stirring time was 40 min.

[0133] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 branched or straight-chain alkanes, specifically DowSyn 270.

[0134] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was ethylene-vinyl acetate copolymer. The antioxidant was IRGANOX® L 57. The nano-phase change material was MOPPoly PCM, purchased from Suzhou Panji Intelligent Storage Energy Technology Co., Ltd.

[0135] The compound additive, by weight percentage, comprises 25% N-phenyl-1-naphthylamine, 25% nonyl-N-(nonylphenyl)aniline, 15% long-chain alkenylamide, 15% β-methylnaphthalene, 10% α-methylnaphthalene, and 3% 5-methyl-1-naphthalene. H - benzotriazole, 3% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 4% heavy aromatic solvent naphtha.

[0136] Example 8 According to the formula shown in Table 3, 15 kg of the first base oil, 5 kg of the second base oil, 78.98 kg of ester base oil, 0.3 kg of pour point depressant, 0.15 kg of antioxidant, 0.1 kg of nano-phase change material, and 0.47 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0137] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0138] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was polystyrene-maleic ester copolymer. The antioxidant was IRGANOX® L 57. The nano-phase change material was MOPPoly PCM, purchased from Suzhou Panji Intelligent Storage Energy Technology Co., Ltd.

[0139] The compound additive, by weight percentage, comprises 20% N-phenyl-1-naphthylamine, 20% nonyl-N-(nonylphenyl)aniline, 12.5% ​​long-chain alkenylamide, 12.5% ​​β-methylnaphthalene, 7.5% α-methylnaphthalene, and 2% 4-methyl-1-naphthalene. H -Benztriazole, 2% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 23.5% heavy aromatic solvent naphtha Example 9 According to the formula shown in Table 4, 8 kg of the first base oil, 20 kg of the second base oil, 70.98 kg of ester base oil, 0.1 kg of pour point depressant, 0.13 kg of antioxidant, 0.08 kg of nano-phase change material, and 0.4 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50℃, and the heating and stirring time was 50 min.

[0140] Table 4. Formulation composition of Examples 9-12 The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0141] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isononyl isononanoate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57. The nano-phase change material was MOPPoly PCM.

[0142] The compound additive, by weight percentage, comprises 20% N-phenyl-1-naphthylamine, 20% nonyl-N-(nonylphenyl)aniline, 12.5% ​​long-chain alkenylamide, 12.5% ​​β-methylnaphthalene, 7.5% α-methylnaphthalene, and 2% 4-methyl-1-naphthalene. H - benzotriazole, 2% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 23.5% heavy aromatic solvent naphtha.

[0143] Example 10 According to the formula shown in Table 4, 20 kg of the first base oil, 5 kg of the second base oil, 70.98 kg of ester base oil, 0.4 kg of pour point depressant, 0.18 kg of antioxidant, 0.12 kg of nano-phase change material, and 0.5 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0144] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0145] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57. The nanophase change material was MOPPoly PCM.

[0146] The compound additive, by weight percentage, comprises 20% N-phenyl-1-naphthylamine, 20% nonyl-N-(nonylphenyl)aniline, 12.5% ​​long-chain alkenylamide, 12.5% ​​β-methylnaphthalene, 7.5% α-methylnaphthalene, and 2% 4-methyl-1-naphthalene. H - benzotriazole, 2% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 23.5% heavy aromatic solvent naphtha.

[0147] Example 11 According to the formula shown in Table 4, 8 kg of the first base oil, 5 kg of the second base oil, 90 kg of ester base oil, 0.1 kg of pour point depressant, 0.1 kg of antioxidant, 0.05 kg of nano-phase change material, and 0.4 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50℃, and the heating and stirring time was 50 min.

[0148] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0149] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57. The nanophase change material was MOPPoly PCM.

[0150] The compound additive, by weight percentage, comprises 20% N-phenyl-1-naphthylamine, 20% nonyl-N-(nonylphenyl)aniline, 12.5% ​​long-chain alkenylamide, 12.5% ​​β-methylnaphthalene, 7.5% α-methylnaphthalene, and 2% 4-methyl-1-naphthalene. H - benzotriazole, 2% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 23.5% heavy aromatic solvent naphtha.

[0151] Example 12 According to the formula shown in Table 4, 17 kg of the first base oil, 10 kg of the second base oil, 71.98 kg of ester base oil, 0.5 kg of pour point depressant, 0.2 kg of antioxidant, 0.15 kg of nano-phase change material, and 0.6 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0152] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0153] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57. The nanophase change material was MOPPoly PCM.

[0154] The compound additive, by weight percentage, comprises 20% N-phenyl-1-naphthylamine, 20% nonyl-N-(nonylphenyl)aniline, 12.5% ​​long-chain alkenylamide, 12.5% ​​β-methylnaphthalene, 7.5% α-methylnaphthalene, and 2% 4-methyl-1-naphthalene. H - benzotriazole, 2% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 23.5% heavy aromatic solvent naphtha.

[0155] Example 13 According to the formula shown in Table 4, 17 kg of the first base oil, 10 kg of the second base oil, 71.98 kg of ester base oil, 0.3 kg of pour point depressant, 0.15 kg of antioxidant, and 0.1 kg of nano-phase change material were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0156] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0157] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57. The nanophase change material was MOPPoly PCM.

[0158] Example 14 According to the formula shown in Table 4, 17 kg of the first base oil, 10 kg of the second base oil, 71.98 kg of ester base oil, 0.3 kg of pour point depressant, 0.15 kg of antioxidant, and 0.47 kg of composite additive were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0159] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0160] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57.

[0161] The compound additive, by weight percentage, comprises 20% N-phenyl-1-naphthylamine, 20% nonyl-N-(nonylphenyl)aniline, 12.5% ​​long-chain alkenylamide, 12.5% ​​β-methylnaphthalene, 7.5% α-methylnaphthalene, and 2% 4-methyl-1-naphthalene. H - benzotriazole, 2% polymer of ethyl 2-acrylate and 2-ethylhexyl 2-acrylate, 23.5% heavy aromatic solvent naphtha.

[0162] Example 15 According to the formula shown in Table 4, 0.5 kg of the first base oil, 20 kg of the second base oil, 71.98 kg of the ester base oil, 0.3 kg of the pour point depressant, and 0.15 kg of the antioxidant were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0163] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0164] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57.

[0165] Example 16 According to the formula shown in Table 4, 20 kg of the first base oil, 0.5 kg of the second base oil, 71.98 kg of the ester base oil, 0.3 kg of the pour point depressant, and 0.15 kg of the antioxidant were heated and stirred to obtain a transparent coolant composition. The heating and stirring temperature was 50°C, and the heating and stirring time was 50 min.

[0166] The first base oil is obtained using the following preparation method: olefin oligomerization is carried out using ethylene as raw material in the presence of a nickel-based catalyst Ni / Al2O3 at a reaction temperature of 220°C and a reaction pressure of 8 MPa. Ethylene molecules undergo polymerization to generate intermediate products such as C4, C6, and C8. These intermediate products continue to react with ethylene to generate C16-C20 olefins. The olefins are then converted into alkanes through hydrocracking. Impurities are removed by adsorption, extraction, and other methods to obtain a high-purity mixture of C16-C20 straight-chain alkanes, specifically DowSyn 270.

[0167] The second base oil was Cargill EF3446, purchased from Cargill. The ester base oil was isooctyl laurate. The pour point depressant was a mineral oil solution of polymethyl methacrylate. The antioxidant was IRGANOX® L 57.

[0168] Comparative Examples 1 to 5 The compositions of Comparative Examples 1-5 were prepared according to the formulations shown in Table 5 and the preparation method of Example 5. The difference between Comparative Examples 1-5 and Examples 5-16 is that the components and amounts of the coolant compositions are different.

[0169] Diisooctyl adipic acid: purchased from Beijing Haohui Weiye Petrochemical Co., Ltd.; Mobil PAO2: Purchased from ExxonMobil; SK60N: Purchased from SK Corporation; Table 5. Composition of Comparative Examples 1-5 Note: In Table 5, " / " indicates that the relevant components are not present.

[0170] The performance parameters of some components in Comparative Examples 1 to 5 were tested. The test methods and results of the performance parameters are shown in Table 6.

[0171] Table 6 Performance testing The performance of the coolant compositions provided in the examples and comparative examples was tested according to the kinematic viscosity test method at 40°C (ASTM D445), the open flash point test method (GB / T 3536), and the specific heat capacity test method (ASTM E1269). The specific results are shown in Table 7.

[0172] Table 7 The performance test results in Table 7 show that: (1) Compared with Comparative Examples 1 to 5, the coolant compositions in Examples 5 to 16 of this application, which are compounded from a first base oil, a second base oil, an ester base oil, a pour point depressant, an antioxidant, a nano-phase change material, and a composite additive, all have a 5mm diameter. 2 With a kinematic viscosity of less than 40℃ and an open flash point of over 170℃ and a specific heat capacity of over 2.2kJ / kg·K, it has good heat transfer performance, as well as excellent thermal oxidation stability and hydrolytic stability, resulting in superior overall performance. (2) Compared with Examples 1 to 4, Examples 5 to 16 of this application provide a coolant composition with optional nano-phase change materials and / or optional composite additives, which can further improve the specific heat capacity and overall performance of the coolant composition of this application.

[0173] Bench simulation test data (charging gun) (1) Test objective The low-viscosity coolant of this application was tested on a bench in Examples 5 and 6 to verify the degree of temperature drop under ultra-fast charging requirements and whether it can achieve high-power ultra-fast charging.

[0174] (2) Test method The control of system temperature and pressure by the coolant is verified by adjusting the charging current, charging voltage, coolant flow rate (flow meter), and inlet and outlet temperatures. Inlet and outlet temperatures refer to the inlet and outlet temperatures, respectively. The inlet temperature is the temperature at which the coolant enters the coolant distribution unit (CDU) after circulating within the charging gun, and the outlet temperature is the temperature at which it flows out of the CDU.

[0175] Test Plan 1: Rotation speed 30~50 r / min; charging current 500~700 A; detection system pressure and inlet / outlet liquid temperature.

[0176] Test scheme 2: Rotation speed 50~70 r / min; charging current 500~700 A; detection system pressure and inlet / outlet liquid temperature.

[0177] Test scheme 3: Rotation speed 50~70 r / min; charging current 700~900 A; detection system pressure and inlet / outlet liquid temperature.

[0178] The three coolant samples from Examples 1 and 2 were tested using the three test schemes described above.

[0179] (3) Test conclusions The test results are shown in Table 8.

[0180] Table 8 Bench Simulation Test Results In Table 8 above, the inlet and outlet temperatures are directly provided by the test bench system.

[0181] The test results from test scheme 1 show that the difference between the inlet temperature and the outlet temperature of the coolant compositions in Examples 5 and 6 of this application are 40.3°C and 40°C, respectively.

[0182] Compared to test scheme 1, in test scheme 2, the system increased the charging gun rotation speed, and the coolant flow rate increased accordingly. The test results from test scheme 2 show that increasing the charging gun rotation speed, which in turn increased the coolant flow rate, reduced the coolant inlet temperature of Examples 5 and 6 by 4.2~5.7℃, indicating that the coolant of this application can improve the overall heat dissipation capacity of the charging cable. Compared to test scheme 1, in test scheme 3, the system increased the charging gun rotation speed and charging current, and the coolant flow rate and charging voltage increased accordingly. The test results from test scheme 3 show that the difference between the coolant inlet temperature and outlet temperature in Examples 5 and 6 decreased by 1.3~1.5℃, indicating that using the coolant of this application can further increase the charging current, thereby reducing the charging time of the charging gun and achieving fast charging requirements. The above test results show that the coolant composition of this application can achieve charging at a higher current while maintaining normal system temperature and pressure, thus meeting the requirements for ultra-fast charging of the charging gun.

[0183] The embodiments described above are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made based on the technical solution of this application should be included within the scope of protection of this application.

Claims

1. A coolant composition, characterized in that, The composition comprises the following components in parts by weight: 8-20 parts of a first base oil, 5-20 parts of a second base oil, 70-90 parts of an ester base oil, 0.1-0.5 parts of a pour point depressant, and 0.1-0.2 parts of an antioxidant; The first base oil is a mixture of straight-chain or branched C16-C50 alkanes, and its kinematic viscosity at 40°C is 3.0-4.0 mm. 2 / s; the second base oil is a mixture of straight-chain, branched, or cyclic C18-C50 alkanes, and the kinematic viscosity of the second base oil at 40°C is 6.4-7.8 mm. 2 / s; The ester base oil is a monoester formed from a monobasic fatty acid and a monohydric alcohol, with a total carbon number of 18 to 22; the monobasic fatty acid has 8 to 16 carbon atoms, and the monohydric alcohol has 4 to 12 carbon atoms.

2. The coolant composition according to claim 1, characterized in that, The first base oil has an open-cup flash point greater than or equal to 144℃ and a specific heat capacity of 2.2~2.4 kJ / kg·K; the second base oil has an open-cup flash point greater than or equal to 185℃ and a specific heat capacity of 2.1~2.3 kJ / kg·K; the ester base oil has a kinematic viscosity of 4.0~6.0 mm at 40℃. 2 / s.

3. The coolant composition according to claim 1 or 2, characterized in that, The first base oil is DowSyn270, the second base oil is Cargill EF3446, and the ester base oil is isooctyl laurate.

4. The coolant composition according to any one of claims 1 to 3, characterized in that, The pour point depressant is selected from one or more of polyacrylate, polymethacrylate, ethylene-vinyl acetate copolymer, polystyrene-maleate copolymer, and polystyrene.

5. The coolant composition according to any one of claims 1 to 4, characterized in that, The coolant composition further includes a nano-phase change material; the nano-phase change material is a metal-organic framework polymer-based phase change material MOPPoly PCM; the nano-phase change material is 0.05~0.15 parts by mass.

6. The coolant composition according to any one of claims 1 to 5, characterized in that, The coolant composition further includes a composite additive; the composite additive is two or more of antioxidants, anti-wear agents, dispersants, preservatives, and stabilizers; the composite additive is 0.4 to 0.6 parts by mass.

7. The coolant composition according to claim 6, characterized in that, The antioxidant is N-phenyl-1-naphthylamine or nonyl-N-(nonylphenyl)aniline; the anti-wear agent is a long-chain alkenylamide; the dispersant is β-methylnaphthalene or α-methylnaphthalene; the preservative is 4-methyl-1-naphthylamine. H -benzotriazole or 5-methyl-1 H - benzotriazole.

8. The coolant composition according to claim 1, characterized in that, The product comprises the following components by weight: 10-17 parts of primary base oil, 5-15 parts of secondary base oil, 70-80 parts of ester base oil, 0.1-0.4 parts of pour point depressant, 0.13-0.18 parts of antioxidant, 0.08-0.12 parts of nano-phase change material and / or 0.4-0.5 parts of composite additives.

9. A method for preparing a coolant composition, characterized in that, The raw materials are provided according to any one of claims 1 to 8 of the coolant composition; the raw materials are heated and mixed evenly to obtain the coolant composition.

10. The coolant composition according to any one of claims 1 to 8 or the coolant composition obtained by the preparation method according to claim 9 is used for cooling data centers, energy storage systems or new energy charging guns.

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