Immersed cooling liquid as well as preparation method and application thereof

Abstract

The invention provides immersed cooling liquid as well as a preparation method and application thereof. The immersed cooling liquid comprises a main solvent, a boiling point improver, a corrosion inhibitor, a reinforcing agent and an antioxidant, according to the immersed cooling liquid, through compounding of the specific main solvent and the specific boiling point improver, perfect combination of a high boiling point and a low GWP is realized, which is a synergistic effect which cannot be realized by an existing single component or a simple mixture; the boiling point of the immersed cooling liquid ranges from 90 DEG C to 140 DEG C, the viscosity at 25 DEG C is lower than 0.5 cst, the GWP value is smaller than 55, and the comprehensive performance is excellent; compared with cooling liquids such as hydrocarbon oil and single fluorine-containing cooling liquids, the immersed cooling liquid disclosed by the invention has the advantages that the comprehensive performance is improved, various advantages of various types of cooling liquids are integrated, and the problems of corrosion, compatibility, boiling point, environmental protection and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of coolant technology, and particularly to an immersion coolant, its preparation method, and its application. Background Technology

[0002] With the rapid development of cloud computing, artificial intelligence (AI), and high-performance computing (HPC), the computing density and power consumption of data centers continue to rise, and traditional air cooling is gradually approaching its physical limits. Immersion liquid cooling technology, by directly immersing heat-generating electronic components (CPU, GPU, memory, etc.) in a highly insulating coolant, utilizes the liquid's much higher heat capacity and thermal conductivity than air for efficient heat dissipation, becoming a key technology for solving the heat dissipation problem of high power density.

[0003] Currently, the most common immersion coolants on the market include: (1) Mineral oil or synthetic oil: Advantages include low cost and good insulation. Disadvantages include high viscosity leading to poor flowability, high pumping power consumption, easy residue, possible oxidation and scaling, and it is usually a single-phase coolant with an upper limit to heat dissipation efficiency. (2) Perfluoropolyether (PFPE) or perfluorocarbon (PFC): Advantages include extremely high chemical inertness, excellent insulation, and non-flammability. Disadvantages include extremely high price, very high global warming potential (GWP), environmental unfriendliness, and some products still have relatively high viscosity. (3) Hydrofluoroether (HFE): Advantages include low viscosity, good flowability, qualified insulation, easy volatilization without leaving residue. Disadvantages include a usually low boiling point (e.g., 3M). TM Novec TM The boiling point of 7100 is 61℃, which leads to large fluctuations in working pressure in two-phase systems. Although the GWP value is lower than that of PFCs, it is still not zero, and the cost is also high.

[0004] The shortcomings of existing technology:

[0005] 1. The contradiction between environmental protection and performance: High-performance fluorinated fluids often have high GWP values, which contradict environmental regulations (such as the Kigali Amendment); while environmentally friendly natural oils have performance (viscosity, stability) and cleanliness issues.

[0006] 2. Insufficient overall performance: Existing coolants cannot simultaneously achieve high boiling point (>90℃), low viscosity, zero ODP (ozone depletion potential), low GWP, excellent material compatibility (especially for plastics and elastomers), long-term thermal / chemical stability, and acceptable cost.

[0007] 3. Material compatibility risk: Some coolants may cause swelling, corrosion or dissolution of common sealing materials in data centers (such as silicone, nitrile rubber, EPDM), leading to leakage risk.

[0008] Therefore, there is an urgent need in this field to develop an immersion coolant that can achieve the best balance between environmental protection, performance, and reliability. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides an immersion coolant, its preparation method, and its application.

[0010] The present invention adopts the following technical solution:

[0011] In a first aspect, the present invention provides an immersion coolant comprising the following components by volume fraction:

[0012] Main solvent: 80–99.8%;

[0013] Boiling point enhancer: 0.1–15%;

[0014] Corrosion inhibitor: 0.1–5%;

[0015] Enhancer: 0-5%;

[0016] Antioxidant: 0–0.2%;

[0017] The main solvent includes at least one of hydrofluoroether, hydrofluoroolefin, perfluoroketone or its isomers or derivatives;

[0018] The boiling point enhancer includes fluorinated solvents or hydrocarbon solvents.

[0019] Preferably, the main solvent includes 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether, C5H3F9O, and C5H2F. 10 O, at least one of cis-1,1,1,4,4,4-hexafluoro-2-butene or hexafluoropropylene trimer.

[0020] Preferably, the boiling point enhancer includes at least one of perfluoro(2-butyltetrahydrofuran) and perfluorotripentylamine.

[0021] Preferably, the corrosion inhibitor includes at least one of benzotriazole, methylbenzotriazole, and organophosphates.

[0022] Preferably, the reinforcing agent includes at least one of a siloxane surfactant or a fluorinated surfactant.

[0023] Preferably, the antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol or amine antioxidants.

[0024] Secondly, the present invention also provides a method for preparing the aforementioned immersion coolant, comprising the following steps:

[0025] Dehydrate the main solvent;

[0026] Add the boiling point enhancer to the dehydrated main solvent, stir, then add corrosion inhibitor, enhancer, and antioxidant, continue stirring, filter, and obtain the immersion coolant.

[0027] Preferably, the main solvent is dehydrated using a molecular sieve.

[0028] Preferably, the boiling point enhancer is added to the dehydrated main solvent, and the mixture is stirred at a rate of 200-500 r / min for 30-60 min at a temperature of 20-40°C. Then, corrosion inhibitor, enhancer, and antioxidant are added, and the mixture is stirred for another 15-30 min. The mixture is then filtered through a filter with a pore size of 0.1-0.5 μm to obtain an immersion coolant.

[0029] Thirdly, the present invention also provides an application of the immersion coolant described above or the immersion coolant prepared by the preparation method described above in an immersion cooling system for electronic devices.

[0030] The immersion coolant, its preparation method, and its application of the present invention have the following advantages compared to the prior art:

[0031] The immersion coolant of this invention comprises a main solvent, a boiling point enhancer, a corrosion inhibitor, a reinforcing agent, and an antioxidant. The main solvent is at least one selected from hydrofluoroethers (HFE), hydrofluoroolefins (HFO), perfluoroketones (PFK), or their isomers or derivatives. The boiling point enhancer includes fluorinated solvents or hydrocarbon solvents, which form an azeotropic or near-azeotropic mixture with the main solvent, significantly increasing the overall boiling point and enhancing thermal stability. The immersion coolant of this invention achieves a perfect combination of high boiling point and low GWP through the compounding of a specific main solvent and a specific boiling point enhancer, a synergistic effect that cannot be achieved by existing single-component or simple mixtures. The immersion coolant of this invention has a boiling point between 90°C and 140°C, a kinematic viscosity of less than 0.5 cst at 25°C, and a GWP value of less than 55, exhibiting excellent comprehensive performance. Compared with hydrocarbon oil-based and single-fluorinated coolants, the immersion coolant of this invention improves comprehensive performance, combining the advantages of various types of coolants and solving problems related to corrosion, compatibility, boiling point, and environmental protection. Detailed Implementation

[0032] To facilitate understanding of the present invention, a more comprehensive description of the invention will be provided below in conjunction with specific embodiments. Preferred embodiments of the invention are given in the specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0033] The order in which the embodiments are described below is not intended to limit the preferred order of the embodiments. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". Various embodiments of the invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any referenced number (fraction or integer) within the indicated range.

[0034] This invention provides an immersion coolant comprising the following components by volume fraction:

[0035] Main solvent: 80–99.8%;

[0036] Boiling point enhancer: 0.1–15%;

[0037] Corrosion inhibitor: 0.1–5%;

[0038] Enhancer: 0-5%;

[0039] Antioxidant: 0–0.2%;

[0040] The main solvent includes at least one of hydrofluoroether, hydrofluoroolefin, perfluoroketone or its isomers or derivatives;

[0041] Boiling point enhancers include fluorinated solvents or hydrocarbon solvents.

[0042] The immersion coolant of the present invention includes a main solvent, a boiling point enhancer, a corrosion inhibitor, a reinforcing agent, and an antioxidant. The main solvent is selected from at least one of hydrofluoroethers (HFE), hydrofluoroolefins (HFO), perfluoroketones (PFK), or their isomers and derivatives (referring to the aforementioned hydrofluoroethers, hydrofluoroolefins, and perfluoroketones). The boiling point enhancer includes fluorinated solvents or hydrocarbon solvents, which form an azeotropic or near-azeotropic mixture with the main solvent, significantly increasing the overall boiling point and enhancing thermal stability.

[0043] The immersion coolant of the present invention achieves a perfect combination of high boiling point and low GWP through the compounding of a specific main solvent and a specific boiling point enhancer. This is a synergistic effect that cannot be achieved by existing single components or simple mixtures. The immersion coolant of the present invention has a boiling point between 90°C and 140°C, a kinematic viscosity of less than 0.5 cst at 25°C, and a GWP value of less than 55, exhibiting excellent overall performance.

[0044] In some embodiments, the main solvent includes 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether (which is a hydrofluoroether (HFE)), C5H3F9O (methyl perfluorobutyl ether), and C5H2F 10 O, at least one of cis-1,1,1,4,4,4-hexafluoro-2-butene (which is a hydrofluoroolefin (HFO)) or hexafluoropropylene trimer (which is a fluorinated olefin derivative).

[0045] In some embodiments, the boiling point enhancer includes at least one of perfluoro(2-butyltetrahydrofuran) and perfluorotripentylamine.

[0046] In some embodiments, the corrosion inhibitor includes at least one of benzotriazole (BTA), methylbenzotriazole (TTAA), and organophosphates. The corrosion inhibitor is used to form a protective film on metal surfaces (particularly copper and aluminum) to prevent electrochemical corrosion.

[0047] In some embodiments, the reinforcing agent includes at least one of a siloxane surfactant or a fluorinated surfactant, which is used to reduce the swelling effect on the elastomeric sealing material and improve the system sealing reliability.

[0048] Specifically, siloxane surfactants include at least one of polyether-modified polydimethylsilane, mercaptosilane, or vinylsilane coupling agents;

[0049] Fluorinated surfactants include at least one of the following: fluorinated ether HFC-4310mee (decafluoropentane), perfluoropolyether carboxylate, or perfluoropolyether phosphate.

[0050] In some embodiments, the antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol (BHT) or an amine antioxidant, for preventing oxidative degradation of the coolant under long-term high-temperature operation.

[0051] This invention primarily improves material performance, including addressing the issue of low boiling point in single-product cooling, thus matching the boiling point requirements of different liquid cooling customers. Many existing fluorinated coolants have high GWP values, which are restricted by the PFAS Act, limiting their application scenarios. In contrast, the immersion coolant of this invention has a low GWP value and is not subject to PFAS restrictions, thus offering a better market prospect. Compared to hydrocarbon oil-based and single-fluorinated coolants, the immersion coolant of this invention improves overall performance, combining the advantages of various types of coolants and solving problems related to corrosion, compatibility, boiling point, and environmental protection.

[0052] Based on the same inventive concept, the present invention also provides a method for preparing the above-mentioned immersion coolant, comprising the following steps:

[0053] S1. Dehydrate the main solvent;

[0054] S2. Add the boiling point enhancer to the dehydrated main solvent, stir, then add the corrosion inhibitor, enhancer, and antioxidant, continue stirring, filter, and obtain the immersion coolant.

[0055] In some embodiments, the main solvent is dehydrated using a molecular sieve. Specifically, under the protection of a dry inert gas (such as nitrogen), the main solvent is dehydrated using a 4A molecular sieve to reduce its water content to less than 50 ppm.

[0056] In some embodiments, a boiling point enhancer is added to the dehydrated main solvent, and the mixture is stirred at a rate of 200-500 r / min for 30-60 min at a temperature of 20-40°C. Then, a corrosion inhibitor, a reinforcing agent, and an antioxidant are added, and the mixture is stirred for another 15-30 min. The mixture is then filtered through a filter with a pore size of 0.1-0.5 μm to obtain an immersion coolant.

[0057] In some embodiments, the filter is a polytetrafluoroethylene (PTFE) filter.

[0058] In some embodiments, the method for preparing the immersion coolant of the present invention includes the following steps:

[0059] S1. Under the protection of a dry inert gas (such as nitrogen), the main solvent is dehydrated by passing it through a molecular sieve to reduce its water content to less than 50 ppm.

[0060] S2. Add the metered main solvent to a reactor equipped with a stirrer and temperature control device. At 20-40°C, slowly add the boiling point enhancer in proportion and stir at 200-500 rpm for 30-60 minutes until completely homogeneous and transparent. Then add the corrosion inhibitor, enhancer and antioxidant in sequence and continue stirring for 15-30 minutes to ensure full dissolution and mixing.

[0061] S3. The coolant mixed in S2 is filtered through a 0.1-0.5μm polytetrafluoroethylene (PTFE) filter to remove particulate matter, and then filled into a sealed container under an inert atmosphere.

[0062] The method for preparing the immersion coolant of the present invention includes dehydration of the main solvent, sequential feeding, and precision filtration steps, which enable the prepared immersion coolant to have advantages such as high purity, low moisture content, and long service life.

[0063] Based on the same inventive concept, the present invention also provides an application of the above-mentioned immersion coolant or the immersion coolant prepared by the above-mentioned preparation method in an immersion cooling system for electronic devices.

[0064] Specifically, the immersion coolant of the present invention is used in immersion cooling systems for electronic devices, particularly in servers, energy storage immersion liquid cooling, and power converters.

[0065] The following specific embodiments further illustrate the immersion coolant of the present invention, its preparation method, and its application. This section further illustrates the content of the present invention in conjunction with specific embodiments, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in the art.

[0066] Example 1

[0067] This embodiment provides an immersion coolant comprising the following components by volume fraction:

[0068] Main solvent: 95%;

[0069] Boiling point enhancer: 4.5%;

[0070] Corrosion inhibitor: 0.4%;

[0071] Antioxidant: 0.1%;

[0072] The main solvent is cis-1,1,1,4,4,4-hexafluoro-2-butene;

[0073] The boiling point enhancer is perfluorinated (2-butyltetrahydrofuran);

[0074] The corrosion inhibitor is benzotriazole (BTA);

[0075] The antioxidant is 2,6-di-tert-butyl-p-cresol (BHT).

[0076] The preparation method of the above-mentioned submersible coolant includes the following steps:

[0077] S1. Under the protection of a dry inert gas (such as nitrogen), the main solvent is dehydrated by passing it through a 4A molecular sieve to reduce its water content to <30ppm.

[0078] S2. Add the metered main solvent to the reactor equipped with a stirrer and temperature control device. At 25°C, add the boiling point enhancer in proportion and stir at 400 rpm for 40 minutes until completely homogeneous and transparent. Then add the corrosion inhibitor and antioxidant in sequence and continue stirring for 20 minutes to ensure full dissolution and mixing.

[0079] S3. Filter the mixed coolant from S2 through a PTFE filter with a pore size of 0.2μm, and then fill it into a sealed container under an inert atmosphere.

[0080] The boiling point, viscosity, dielectric strength, GWP, copper strip corrosion test, and silicone rubber immersion of the immersion coolant in Example 1 were tested, and the results are shown in Table 1 below.

[0081] Table 1 - Performance test results of the submerged coolant in Example 1

[0082]

[0083] As shown in Table 1, the boiling point of the submerged coolant in Example 1 is 102.5℃, which is one of the most significant advantages of this invention. It perfectly solves the core problem mentioned in the background art: the boiling point of HFE-type coolants (such as Novec 7100, boiling point 61℃) is too low. The viscosity of the submerged coolant in Example 1 is 0.42 cst, an extremely low value. This data shows that this invention achieves a high boiling point without sacrificing fluidity, successfully avoiding the disadvantage of high viscosity (typically >10 cst) of mineral oil-based coolants. The dielectric strength of the submerged coolant in Example 1 is 45 kV, far exceeding the industrial standard (typically requiring >30 kV), indicating extremely excellent insulation performance, fully meeting and far exceeding the stringent electrical safety requirements of submerged coolants. A GWP of 4 is an exceptionally high value. In comparison, the GWP of traditional PFPE liquids can reach thousands to tens of thousands, and the GWP of early HFE was in the hundreds. The GWP of CO2 is defined as 1. Copper sheet corrosion resistance (Grade 1a) – the cornerstone of long-term reliability. In the ASTM D130 standard, Grade 1a indicates "slight discoloration, pale orange," which is almost the best achievable result. Grade 4 indicates severe corrosion. This invention's formulation ensures the integrity of metallic materials in electronic equipment under long-term immersion conditions, guaranteeing the reliability of 24 / 7 uninterrupted operation in data centers. Compatibility with silicone rubber (volume change rate +3.5%) – a guarantee of system sealing. For elastomeric sealing materials, slight swelling (generally considered acceptable within ±5%) can sometimes even be beneficial to sealing; +3.5% is an ideal result.

[0084] Example 2

[0085] This embodiment provides an immersion coolant comprising the following components by volume fraction:

[0086] Main solvent: 88%;

[0087] Boiling point enhancer: 10%;

[0088] Corrosion inhibitor: 1.5%;

[0089] Enhancer: 0.45%;

[0090] Antioxidant: 0.05%;

[0091] The main solvent is C5H3F9O (methyl perfluorobutyl ether);

[0092] The boiling point enhancer is perfluorotripentylamine;

[0093] The corrosion inhibitor is methylbenzotriazole (TTAA);

[0094] The reinforcing agent is fluorinated ether HFC-4310mee (decafluoropentane);

[0095] The antioxidant is 2,6-di-tert-butyl-p-cresol (BHT).

[0096] The preparation method of the above-mentioned submersible coolant includes the following steps:

[0097] S1. Under the protection of a dry inert gas (such as nitrogen), the main solvent is dehydrated by passing it through a 4A molecular sieve to reduce its water content to <30ppm.

[0098] S2. Add the metered main solvent to the reactor equipped with a stirrer and temperature control device. At 25°C, add the boiling point enhancer in proportion and stir at 400 rpm for 40 minutes until completely homogeneous and transparent. Then add the corrosion inhibitor and antioxidant in sequence and continue stirring for 20 minutes to ensure full dissolution and mixing.

[0099] S3. Filter the mixed coolant from S2 through a PTFE filter with a pore size of 0.2μm, and then fill it into a sealed container under an inert atmosphere.

[0100] The boiling point, viscosity, dielectric strength, GWP, copper strip corrosion test, and silicone rubber immersion of the immersion coolant in Example 2 were tested, and the results are shown in Table 2 below.

[0101] Table 2 - Performance test results of the submerged coolant in Example 2

[0102]

[0103]

[0104] As can be seen from Table 2, the boiling point of the submersible coolant in Example 2 is 97.6℃, which is relatively high. The viscosity of the submersible coolant in Example 2 at 25℃ is 0.48cst, which is low. This data shows that the present invention achieves a high boiling point without sacrificing fluidity, and successfully avoids the disadvantage of high viscosity (usually >10cst) of mineral oil coolants. In Example 2, the dielectric strength of the immersion coolant is 51kV, which is far higher than the industry standard (usually required to be >30kV), indicating that its insulation performance is extremely excellent, fully meeting and far exceeding the stringent requirements for electrical safety of immersion coolants. In Example 2, the GWP of the immersion coolant is <55 (relative to CO2), while the GWP of traditional PFPE liquids can reach thousands to tens of thousands, and the GWP of early HFE is also in the hundreds, which is in line with the environmental protection trend. When the immersion coolant in Example 2 is tested for copper strip corrosion, the result is grade 1a, indicating that the coolant is not corrosive to copper. The formulation of this invention can ensure the integrity of the metal materials of electronic equipment under long-term immersion conditions, and ensure the reliability of the 24 / 7 uninterrupted operation of data centers. When the immersion coolant in Example 2 is soaked with silicone rubber, the volume change rate of silicone rubber is +1.7% (volume expansion rate 1.7%). Slight swelling (generally considered to be within ±5% is acceptable) can sometimes even be beneficial to sealing, and +1.7% is a very ideal result.

[0105] Comparative Example 1

[0106] This comparison model provides commercially available 3M products. TM Novec TM The same test was performed on 7100 electronic fluorinated fluid (which can be used as a coolant), and the results are shown in Table 3 below.

[0107] Table 3 - 3M in Comparative Example 1 TM Novec TM Performance test results of 7100 electronic fluorinated liquid

[0108]

[0109] As shown in Table 3, the boiling point (61℃) of the electronic fluorinated liquid in Comparative Example 1 is low. An excessively low boiling point makes it unsuitable for high-heat environments, resulting in high evaporation losses and sealing costs. Furthermore, the copper strip corrosion test result for the electronic fluorinated liquid in Comparative Example 1 was Level 2. According to the ASTM D130 standard, copper strip corrosion levels range from 1a (optimal, no corrosion) to 4c (worst, severe corrosion). Novec... TMThe "Level 2" performance of 7100 indicates that its corrosion resistance is weak, which accelerates the aging of copper components and increases the maintenance burden. In Comparative Example 1, when the electronic fluorinated liquid was immersed in silicone rubber, the volume change rate of silicone rubber was +12% (volume expansion rate of 12%). It has poor compatibility with silicone rubber, and excessive swelling of silicone rubber directly threatens the sealing safety of the system, and the risk is uncontrollable.

[0110] Furthermore, the performance test results of the coolant in Examples 1-2 and Comparative Example 1 are compared in Table 4 below.

[0111] Table 4 - Performance comparison of coolants in Examples 1-2 and Comparative Example 1

[0112] Test Project Example 1 Example 2 <![CDATA[Comparative Example (Novec TM 7100)]]> boiling point 102.5℃ 97.6℃ 61℃ Kinematic viscosity at 25℃ 0.42cst 0.48cst 0.42sct Dielectric strength 45kV 51kV 40kV GWP 4 <55 210 Copper sheet corrosion (100℃, 168h) 1a level 1a level Level 2 Soak in silicone rubber (85℃, 72h) +3.5％ +1.7％ +12％

[0113] As can be seen from Table 4, Example 1 is extremely environmentally friendly and top-notch in all aspects of performance; Example 2 is also top-notch in all aspects of performance, except that its GWP value is slightly higher than that of Example 1, but it is still much lower than that of the control group and is within the environmental protection range.

[0114] As can be seen from the comparison of the test data of Examples 1-2 and Comparative Example 1, the coolant provided by the present invention is superior to existing commercial products in all key performance indicators, such as greatly enhancing the boiling point of the product, improving the product's compatibility with materials and corrosion, and perfectly solving many problems raised in the background art.

[0115] It is understood that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above are merely preferred embodiments of this application, and only specifically describe the technical principles of this application. These descriptions are only for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, as well as other specific embodiments of this application that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of this application.

Claims

1. An immersion coolant, characterized in that, Components including the following volume fractions: Main solvent: 80–99.8%; Boiling point enhancer: 0.1–15%; Corrosion inhibitor: 0.1–5%; Enhancer: 0-5%; Antioxidant: 0–0.2%; The main solvent includes at least one of hydrofluoroether, hydrofluoroolefin, perfluoroketone or its isomers or derivatives; The boiling point enhancer includes fluorinated solvents or hydrocarbon solvents.

2. The immersion coolant as described in claim 1, characterized in that, The main solvent includes 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether, C5H3F9O, and C5H2F. 10 O, at least one of cis-1,1,1,4,4,4-hexafluoro-2-butene or hexafluoropropylene trimer.

3. The immersion coolant as described in claim 1, characterized in that, The boiling point enhancer includes at least one of perfluoro(2-butyltetrahydrofuran) and perfluorotripentylamine.

4. The immersion coolant as described in claim 1, characterized in that, The corrosion inhibitor includes at least one of benzotriazole, methylbenzotriazole, and organophosphates.

5. The immersion coolant as described in claim 1, characterized in that, The reinforcing agent includes at least one of a siloxane surfactant or a fluorinated surfactant.

6. The immersion coolant as described in claim 1, characterized in that, The antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol or amine antioxidants.

7. A method for preparing an immersion coolant as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Dehydrate the main solvent; Add the boiling point enhancer to the dehydrated main solvent, stir, then add corrosion inhibitor, enhancer, and antioxidant, continue stirring, filter, and obtain the immersion coolant.

8. The method for preparing the immersion coolant as described in claim 7, characterized in that, The main solvent is dehydrated using molecular sieves.

9. The method for preparing the immersion coolant as described in claim 7, characterized in that, Add the boiling point enhancer to the dehydrated main solvent, stir at 200-500 r / min for 30-60 min at 20-40℃, then add corrosion inhibitor, enhancer and antioxidant, and continue stirring for 15-30 min. Filter through a filter with a pore size of 0.1-0.5 μm to obtain the immersion coolant.

10. The application of an immersion coolant as described in any one of claims 1 to 6 or an immersion coolant prepared by any one of claims 7 to 9 in an immersion cooling system for electronic devices.

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