One-phase immersion fluorine-containing coolant and its use

Abstract

The application discloses a single-phase immersed fluorine-containing cooling liquid, wherein the fluorine-containing cooling liquid comprises hexafluoropropylene trimer and hydrofluoroolefin, the molecular formula of the hexafluoropropylene trimer is C9F 18 , the molecular formula of the hydrofluoroolefin is C9H2F 16 , the fluorine-containing cooling liquid has good electric insulation performance and high heat transfer coefficient; and the fluorine-containing cooling liquid has good compatibility with currently used materials and equipment, and can be used by replacing the fluid without replacing the materials and equipment.

Description

Technical Field

[0001] This application relates to the field of fluid heat transfer technology, and in particular to a single-phase immersion fluorinated coolant and its application. Background Technology

[0002] Hexafluoropropylene trimer is a colorless, odorless, and transparent liquid with excellent environmental performance, good safety performance, high electrical insulation performance, low dielectric constant, and non-flammability. It has been widely used in data centers and electronic products as a single-phase immersion coolant. However, hexafluoropropylene trimer has the following shortcomings: (1) Its thermal conductivity is low, only about 0.065 W / (m·K), which is difficult to meet the heat dissipation requirements of high heat flux density electronic devices; (2) Hexafluoropropylene trimer exhibits acid backflow during long-term operation, posing a risk of equipment corrosion.

[0003] To date, no heat transfer fluid has been found that simultaneously satisfies the requirements of good electrical insulation, high heat transfer coefficient, and good thermal stability. Summary of the Invention

[0004] To address the problems existing in the prior art, this application provides a single-phase immersion fluorinated coolant and its application, wherein the fluorinated coolant not only has good electrical insulation properties but also a high heat transfer coefficient.

[0005] The specific technical solution of this application is as follows:

[0006] 1. A single-phase immersion fluorinated coolant, wherein the fluorinated coolant comprises hexafluoropropylene trimer and hydrofluoroolefin, the molecular formula of the hexafluoropropylene trimer being C9F... 18 The molecular formula of the hydrofluoroolefin is C9H2F. 16 .

[0007] 2. The fluorinated coolant according to claim 1, wherein the hexafluoropropylene trimer comprises 50-99% by mass percentage in the fluorinated coolant;

[0008] The hydrofluoroolefin content is 1-50%.

[0009] 3. The fluorinated coolant according to item 1 or 2, wherein the hexafluoropropylene trimer is E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, or a mixture of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2, A mixture of 4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene, preferably E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene or Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene.

[0010] 4. The fluorinated coolant according to item 3, wherein the hexafluoropropylene trimer is composed of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene. When mixed, the mass percentages of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene, and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene are 50-70:10-49:0-5:5-20.

[0011] 5. The fluorinated coolant according to any one of items 1-4, wherein the hydrofluoroolefin is selected from E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, E-1,1,1,2,6,6,6-heptafluoro-2,5,5-tris(trifluoromethyl)-3-hexene, E-1,1,1,2,5,6,6,7,7,7-decafluoro-2,5-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,5,5,6,7,7,7-decafluoro-2,6-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2 ,3,3,6,7,7,8,8,8-Tetrafluoro-6-(trifluoromethyl)-4-octene, E-1,1,1,2,2,3,3,6,6,7,8,8,8-Tetrafluoro-7-(trifluoromethyl)-4-octene, E-1,1,1,2,2,3,3,6,6,7,7,8,8,9,9,9-Hexadecaflofluoro-4-nonene, E-1,1,1,2,2,6,6,7,7,7-Decafluoro-5,5-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,5,5,6,6,7,7,8,8,9,9,9-Hexadecaflofluoro-3-nonene, E-1 ,1,1,4,5,5,6,6,7,7,8,8,8-Tetrafluoro-4-(trifluoromethyl)-2-octene, E-1,1,1,4,4,5,5,6,6,7,7,8,8,9,9,9-Hexadecaf-2-nonene, E-1,1,1,5,5,6,6,7,7,7-Decafluoro-2,2-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,5,5,6,6,7,8,8,8-Tetrafluoro-7-(trifluoromethyl)-3-octene and E-1,1,1,5,5,6,6,7,7,7-Decafluoro-4,4-bis(trifluoromethyl ester)- One or more of 2-heptene, preferably selected from E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, E-1,1,1,2,5,5,6,7,7,7-decafluoro-2,6-bis(trifluoromethyl)-3-heptene and E-1,1,1,2,2,3,3,6,7,7,8,8,8-tetrafluoro-6-(trifluoromethyl)-4-octene, and more preferably E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene.

[0012] 6. The fluorinated coolant according to any one of claims 1-5, wherein the boiling point of the fluorinated coolant is 100-130°C, and / or

[0013] The dielectric constant of the fluorinated coolant is less than 2.

[0014] 7. Use of any one of the fluorinated coolants in items 1-6 in cooling servers, heat dissipation systems, communication equipment and / or lighting systems.

[0015] 8. The use according to item 7, wherein the cooling is performed by cooling the surfaces of the server, heat dissipation system, communication equipment and / or lighting system in liquid phase form.

[0016] 9. A method for cooling a server, heat dissipation system, communication equipment, and / or lighting system using any one of items 1-6, comprising:

[0017] Servers, cooling systems, communication equipment, and / or lighting systems are cooled by immersing them in a fluorinated coolant.

[0018] 10. A heat transfer medium comprising any one of the fluorine-containing coolants described in items 1-6.

[0019] The effects of the invention

[0020] The fluorinated coolant provided in this application not only has good electrical insulation properties, but also has the advantage of a high heat transfer coefficient;

[0021] The fluorinated coolant described in this application has a dielectric constant of less than 2, which allows high-frequency electronic components and connectors to be immersed in the fluorinated coolant without significant loss of signal integrity, thereby enabling the fluorinated coolant to be used in immersion cooling systems.

[0022] The fluorinated coolant provided in this application has good compatibility with currently used materials and equipment, and can be used without changing materials and equipment. Detailed Implementation

[0023] The present application will now be described in detail with reference to the described embodiments. Although specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0024] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0025] This application provides a single-phase immersion fluorinated coolant, wherein the fluorinated coolant comprises hexafluoropropylene trimer and hydrofluoroolefin, and the molecular formula of the hexafluoropropylene trimer is C9F. 18 The molecular formula of the hydrofluoroolefin is C9H2F. 16 .

[0026] The boiling range is the temperature at which the first drop of liquid begins to drip from the condenser during distillation (initial distillation temperature) and the temperature at which the last drop drips (final distillation temperature). The range between these two temperatures is the boiling range. Liquid mixtures contain multiple substances with different boiling points, thus altering the boiling range. When the components of a liquid mixture are arranged in a specific ratio, an azeotrope or near-azeotrope is easily obtained, and under a fixed pressure, the mixture has only one boiling point. Therefore, when the boiling range of the liquid is within a reasonable range, it can effectively dissipate heat from electronic components immersed in a fluorinated coolant. The fluorinated coolant described in this application, being an azeotrope or near-azeotrope, does not change its composition or affect its heat transfer performance during leakage or phase change. Similarly, because electronic components are immersed in the fluorinated coolant, when the dielectric constant of the coolant is less than 2, high-frequency electronic components and connectors can be immersed without significant loss of signal integrity, thus enabling the fluorinated coolant to be used in immersion cooling systems.

[0027] In some embodiments, the fluorinated coolant is composed of hexafluoropropylene trimer and hydrofluoroolefin.

[0028] In some embodiments, the hexafluoropropylene trimer is 50-99% by mass percentage in the fluorinated coolant;

[0029] The hydrofluoroolefin content is 1-50%.

[0030] For example, the hexafluoropropylene trimer can be 50%, 55%, 60%, 65%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc., based on its mass percentage in the fluorinated coolant.

[0031] The hydrofluoroolefin can be 1%, 5%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 30%, 35%, 40%, 45%, 50%, etc.

[0032] In some embodiments, the hexafluoropropylene trimer is E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, or a mixture of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octa ... A mixture of fluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene, preferably E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene or Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, more preferably E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene.

[0033] In some embodiments, the hexafluoropropylene trimer is composed of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene, and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene. When the mixture is used, the mass percentages of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene, and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene are 50-70:10-49. ∶0-5∶5-20, that is, in a mixture composed of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene, E- 1,1,1,2,3,5,5,6,6,7,7,7-Dodecano-2,4-bis(trifluoromethyl)hept-3-ene accounts for 50-70%, Z-1,1,1,2,3,5,5,6,6,7,7,7-Dodecano-2,4-bis(trifluoromethyl)hept-3-ene accounts for 10-49%, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene accounts for 0-5%, and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene accounts for 5-20%.

[0034] For example, in the case of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-( In a mixture composed of perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene, E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene can be 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, etc.

[0035] Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 49%, etc.

[0036] 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene can be 0%, 1%, 2%, 3%, 4%, 5%, etc.;

[0037] 1,1,1,4,5,5-Hepenofluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc.

[0038] In some embodiments, the hydrofluoroolefin is selected from E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, E-1,1,1,2,6,6,6-heptafluoro-2,5,5-tris(trifluoromethyl)-3-hexene, E-1,1,1,2,5,6,6,7,7,7-decafluoro-2,5-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,5,5,6,7,7,7-decafluoro-2,6-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,3,3,6,7,7, 8,8,8-Tetrafluoro-6-(trifluoromethyl)-4-octene, E-1,1,1,2,2,3,3,6,6,7,8,8,8-Tetrafluoro-7-(trifluoromethyl)-4-octene, E-1,1,1,2,2,3,3,6,6,7,7,8,8,9,9,9-Hexadecaflofluoro-4-nonene, E-1,1,1,2,2,6,6,7,7,7-Decafluoro-5,5-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,5,5,6,6,7,7,8,8,9,9,9-Hexadecaflofluoro-3-nonene, E-1,1,1,4, 5,5,6,6,7,7,8,8,8-Tetrafluoro-4-(trifluoromethyl)-2-octene, E-1,1,1,4,4,5,5,6,6,7,7,8,8,9,9,9-Hexadecaflofluoro-2-nonene, E-1,1,1,5,5,6,6,7,7,7-Decafluoro-2,2-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,5,5,6,6,7,8,8,8-Tetrafluoro-7-(trifluoromethyl)-3-octene and E-1,1,1,5,5,6,6,7,7,7-Decafluoro-4,4-bis(trifluoromethyl)-2-heptene One or more of the following are preferred: E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, E-1,1,1,2,5,5,6,7,7,7-decafluoro-2,6-bis(trifluoromethyl)-3-heptene, and E-1,1,1,2,2,3,3,6,7,7,8,8,8-tetrafluoro-6-(trifluoromethyl)-4-octene; and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene.

[0039] In some embodiments, the boiling point of the fluorinated coolant is 100-130°C, and / or

[0040] The dielectric constant of the fluorinated coolant is less than 2.

[0041] For example, the boiling point of the fluorinated coolant can be 100℃, 105℃, 110℃, 115℃, 120℃, 125℃, 130℃, etc.

[0042] The dielectric constant of the fluorinated coolant can be, for example, 0.1, 0.5, 0.8, 1, 1.1, 1.5, 1.8, 1.9, etc.

[0043] In this application, no restrictions are placed on the method for determining the boiling point of fluorine-containing coolants. Conventional methods in the art can be used, such as GB / T 616-2006 "General Method for Determination of Boiling Point of Chemical Reagents".

[0044] This application does not impose any restrictions on the method for determining the dielectric constant of fluorinated coolants. It can also be determined using conventional methods in the field, such as the method disclosed in GB / T 1409-2006.

[0045] In some embodiments, the fluorinated coolant comprises hexafluoropropylene trimer and hydrofluoroolefin, wherein the hexafluoropropylene trimer has the molecular formula C9F. 18 The molecular formula of the hydrofluoroolefin is C9H2F. 16In some embodiments, the hexafluoropropylene trimer comprises 50-99% by mass percentage in the fluorinated coolant, preferably 60-90%, more preferably 75-85%; and the hydrofluoroolefin comprises 1-50%, preferably 10-40%, more preferably 15-25%. In some embodiments, the hexafluoropropylene trimer is E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene or E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z ... A mixture of (methyl)hepta-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene, preferably E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hepta-3-ene. In some embodiments, when the hexafluoropropylene trimer is a mixture of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene, The mass percentages of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene, and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene are 50-70∶10-49∶0-5∶5-20.In some embodiments, the hydrofluoroolefin is selected from E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, E-1,1,1,2,6,6,6-heptafluoro-2,5,5-tris(trifluoromethyl)-3-hexene, E-1,1,1,2,5,6,6,7,7,7-decafluoro-2,5-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,5,5,6,7,7,7-decafluoro-2,6-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,3,3,6,7,7, 8,8,8-Tetrafluoro-6-(trifluoromethyl)-4-octene, E-1,1,1,2,2,3,3,6,6,7,8,8,8-Tetrafluoro-7-(trifluoromethyl)-4-octene, E-1,1,1,2,2,3,3,6,6,7,7,8,8,9,9,9-Hexadecaflofluoro-4-nonene, E-1,1,1,2,2,6,6,7,7,7-Decafluoro-5,5-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,5,5,6,6,7,7,8,8,9,9,9-Hexadecaflofluoro-3-nonene, E-1,1,1,4, 5,5,6,6,7,7,8,8,8-Tetrafluoro-4-(trifluoromethyl)-2-octene, E-1,1,1,4,4,5,5,6,6,7,7,8,8,9,9,9-Hexadecaflofluoro-2-nonene, E-1,1,1,5,5,6,6,7,7,7-Decafluoro-2,2-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,5,5,6,6,7,8,8,8-Tetrafluoro-7-(trifluoromethyl)-3-octene and E-1,1,1,5,5,6,6,7,7,7-Decafluoro-4,4-bis(trifluoromethyl)-2-heptene The fluorinated coolant contains one or more of the following, preferably selected from E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, E-1,1,1,2,5,5,6,7,7,7-decafluoro-2,6-bis(trifluoromethyl)-3-heptene, and E-1,1,1,2,2,3,3,6,7,7,8,8,8-tetrafluoro-6-(trifluoromethyl)-4-octene, and more preferably E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene. In some embodiments, the boiling point of the fluorinated coolant is 100-130°C, and / or the dielectric constant of the fluorinated coolant is less than 2.

[0046] The fluorinated coolant described in this application significantly improves its heat transfer performance and efficiency by adding hydrofluoroolefins to hexafluoropropylene trimer.

[0047] Furthermore, the fluorinated coolant described in this application contains a hydrofluoroolefin containing vinylidene-CH=CH-, which can capture free radical ions generated by the hexafluoropropylene trimer during long-term operation, thereby suppressing the acidification phenomenon of the hexafluoropropylene trimer during operation and significantly improving the thermal stability of the hexafluoropropylene trimer.

[0048] In addition, the dielectric constant of the fluorinated coolant described in this application is less than 2, or even less than 1.9, which allows high-frequency electronic components and connectors to be immersed in the fluid without significant loss of signal integrity, fully meeting the requirements for using fluorinated heat transfer fluid in immersion cooling systems.

[0049] This application provides the use of the aforementioned fluorinated coolant in cooling servers, heat dissipation systems, communication equipment, and / or lighting systems. In some embodiments, the cooling is performed by cooling the surfaces of the server, heat dissipation system, communication equipment, and / or lighting system in liquid phase form.

[0050] In this application, the server is primarily used as a data center server.

[0051] In the application of this fluorinated coolant, heat is transferred to the cooling surface of an object through a single-phase liquid form, absorbing the object's heat and thus lowering the object's temperature, without any phase change between the liquid and gas phases.

[0052] This application provides a method for cooling a server, heat dissipation system, communication equipment, and / or lighting system using the aforementioned fluorine-containing coolant, comprising:

[0053] Servers, cooling systems, communication equipment, and / or lighting systems are cooled by immersing them in a fluorinated coolant.

[0054] In some implementations, servers, cooling systems, communication equipment, and / or lighting systems are immersed in a fluorinated coolant and cooled using a circulation system and / or radiators to remove heat from the fluorinated coolant.

[0055] The circulation system can be, for example, a liquid pump, a pipeline, a liquid-liquid heat exchanger, etc.

[0056] The radiator can be a dry cooler.

[0057] This application provides a heat transfer medium comprising the fluorine-containing coolant described above.

[0058] Example

[0059] This application provides a general and / or specific description of the materials and test methods used in the experiments. In the following examples, unless otherwise specified, % represents wt%, i.e., weight percentage. All reagents or instruments used, unless otherwise specified, are commercially available conventional reagent products.

[0060] (a) Boiling point test

[0061] The boiling point of fluorine-containing coolant was determined using the method disclosed in GB / T 616-2006 "General Method for Determination of Boiling Point of Chemical Reagents".

[0062] (II) Electrical Insulation Performance Test

[0063] (1) Dielectric constant test method: The test shall be carried out in accordance with the national standard GB / T 1409-2006.

[0064] (2) Dielectric strength test method: The test was conducted according to the national standard GB T 5654-1985 under the conditions of voltage frequency of 1000Hz and electrode plate spacing of 2.54mm.

[0065] (III) The heat transfer coefficient test method is as follows:

[0066] (1) Standard: ASTM E1461

[0067] The laser flare method is a test method for determining the thermal diffusivity of solids. A high-intensity energy pulse irradiates a small, thin sample for a short time. The energy of the pulse is absorbed by the front surface of the sample, and the resulting temperature rise on the back surface is recorded (temperature auto-recording curve). The value of the thermal diffusivity is calculated by considering the sample thickness and the time required for the back surface temperature rise to reach its maximum value.

[0068] (2) Instrument model: ASTM E1461 laser thermal conductivity meter LFA46

[0069] Test method: Laser flare method (LFA)

[0070] Test standard: ASTM E1461

[0071] Temperature range: -100℃ to 500℃

[0072] Heating rate: up to 50K / min

[0073] Thermal diffusivity: 0.01 mm 2 / s-1000mm 2 / s

[0074] Thermal conductivity: 0.1 W / (m·K) - 2000 W / (m·K)

[0075] Accuracy: Thermal diffusivity: + / -3%; Specific heat: + / -5% (standard sample)

[0076] Repeatability: Thermal diffusivity: + / -2%; Specific heat: + / -3%

[0077] (3) Method principle:

[0078] The laser scintillation method uses a pulsed laser to irradiate one surface of the sample, and then monitors the temperature change of the other surface using an infrared thermometer. The actual measured data is the thermal diffusivity α(T) of the sample. The specific heat Cp(T) and density ρ(T) of the sample also need to be known. Finally, the thermal conductivity is calculated using the formula λ(T)=α(T)*Cp(T)*ρ(T).

[0079] (a) LFA467: The horizontal thermal diffusivity can be directly measured. The specific heat needs to be obtained by testing with sapphire (99.99% α-alumina) and the thermal conductivity can be calculated. The in-plane thermal diffusivity test is suitable for high-conductivity ultrathin samples, but not for low-conductivity samples.

[0080] (iv) The thermal stability test method is as follows:

[0081] The thermal stability of fluorinated coolants was evaluated by testing in sealed glass tubes according to the method of ANSI / ASHRAE Standard 97-2007. Fluorinated coolant samples were placed in glass tubes containing impregnated specimens of metals commonly used in liquid cooling systems (such as Fe, Al, Cu, and stainless steel 316; in this application, Fe was used). The tubes were sealed and heated in an oven at 175°C for 32 days. The decomposition of the fluorinated coolant after 32 days of aging was quantified by the measured fluoride ion concentration (parts per million (ppm)).

[0082] Example 1

[0083] E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene were mixed at a mass percentage of 0.1%:99.9% to obtain a fluorinated coolant. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability were tested, and the test results are shown in Table 1.

[0084] Example 2

[0085] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 1%:99%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0086] Example 3

[0087] The operation was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 10%:90%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0088] Example 4

[0089] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 20%:80%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0090] Example 5

[0091] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 30%:70%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0092] Example 6

[0093] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 40%:60%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0094] Example 7

[0095] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was changed to 50%:50%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0096] Example 8

[0097] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 60%:40%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0098] Example 9

[0099] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 70%:30%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0100] Example 10

[0101] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 80%:20%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0102] Example 11

[0103] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 85%:15%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0104] Example 12

[0105] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 90%:10%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0106] Example 13

[0107] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 99%:1%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0108] Example 14

[0109] The procedure was the same as in Example 1, except that the mass percentage of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene and E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was modified to 99.9%:0.1%. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0110] Example 15

[0111] The procedure was the same as in Example 8, except that E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, and 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pentane were used. E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)pent-2-ene was replaced by a mixture of 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene at mass percentages of 65%, 24%, 0.1%, and 10.9%. The boiling point, electrical insulation properties, heat transfer coefficient, and thermal stability results are shown in Table 1.

[0112] Example 16

[0113] The procedure was the same as in Example 8, except that E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, and 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl) E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene were replaced by mixtures of 50%, 40%, 0%, and 10% by mass. The boiling points, electrical insulation properties, heat transfer coefficients, and thermal stability results are shown in Table 1.

[0114] Example 17

[0115] The procedure was the same as in Example 8, except that E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, and 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl) E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)pent-2-ene was replaced by a mixture of pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene at mass percentages of 70%, 10%, 5%, and 15%. The boiling point, electrical insulation properties, heat transfer coefficient, and thermal stability results are shown in Table 1.

[0116] Example 18

[0117] The procedure was the same as in Example 8, except that E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, and 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl) E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene were replaced by mixtures of 41%, 49%, 5%, and 5% by mass, respectively. The boiling point, electrical insulation properties, heat transfer coefficient, and thermal stability results are shown in Table 1.

[0118] Example 19

[0119] The procedure was the same as in Example 8, except that E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, and 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl) E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)pent-2-ene was replaced by a mixture of pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene at mass percentages of 50%, 25%, 5%, and 20%. The boiling point, electrical insulation properties, heat transfer coefficient, and thermal stability results are shown in Table 1.

[0120] Example 20

[0121] The procedure was the same as in Example 8, except that E-1,1,1,2,5,5,6,7,7,7-decafluoro-2,6-bis(trifluoromethyl)-3-heptene was used instead of E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0122] Example 21

[0123] The procedure was the same as in Example 8, except that E-1,1,1,2,2,3,3,6,7,7,8,8,8-tetrafluoro-6-(trifluoromethyl)-4-octene was used instead of E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0124] Example 22

[0125] The procedure was the same as in Example 8, except that E-1,1,1,2,5,6,6,7,7,7-decafluoro-2,5-bis(trifluoromethyl)-3-heptene was used instead of E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene. The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability results are shown in Table 1.

[0126] Comparative Example 1

[0127] E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene was tested for boiling point, electrical insulation properties, heat transfer coefficient and thermal stability. The results are shown in Table 1.

[0128] Comparative Example 2

[0129] The boiling point, electrical insulation properties, heat transfer coefficient and thermal stability of Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene were tested, and the results are shown in Table 1.

[0130] Comparative Example 3

[0131] The same procedure as in Example 8 was followed, except that E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene was replaced with 3,3,4,4,5,5,-hexafluorocyclopentene. The results of the boiling point, electrical insulation properties, heat transfer coefficient and thermal stability tests are shown in Table 1.

[0132] Table 1

[0133]

[0134]

[0135]

[0136]

[0137]

[0138]

[0139]

[0140] The results in Table 1 show that by adding hydrofluoroolefins, the heat transfer coefficient and efficiency are significantly improved while maintaining the excellent electrical insulation performance (≥40kV) of the fluorinated fluid. Simultaneously, the thermal stability is enhanced, resulting in a fluoride ion concentration far below 100ppm, meeting the application requirements. Therefore, the single-phase submerged fluorinated coolant provided in this application exhibits excellent heat transfer efficiency and good thermal stability.

[0141] As can be seen from Table 1, for Examples 1-6, due to the relatively large amount of fluorinated olefins added, the fluorinated coolant has good thermal stability, increased thermal conductivity, and enhanced dielectric strength. However, since the production cost of fluorinated olefins is very high, adding a certain amount of hexafluoropropylene trimer to the fluorinated coolant can achieve relatively good performance, such as relatively good thermal stability, thermal conductivity, and dielectric strength, and greatly reduce the production cost.

[0142] Compared with Examples 15-19, the dielectric constants of the fluorinated coolants prepared using different hexafluoropropylene trimers are different, and the dielectric constant of the fluorinated coolant described in Example 8 is lower.

[0143] Comparing Examples 8 and 20-22, it can be seen that the use of different hydrofluoroolefins has completely different effects on the performance of fluorinated coolants. The hydrofluoroolefin E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene has relatively better performance.

[0144] Comparing Example 8 with Comparative Examples 1-2, it can be seen that using a single hexafluoropropylene trimer has drawbacks such as poor thermal stability and poor heat transfer performance. However, after using a mixture of hexafluoropropylene trimer with hydrofluoroolefin E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, the thermal stability is good and the heat transfer performance is significantly improved.

[0145] Comparing Example 8 and Comparative Example 3, it can be seen that replacing E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene with 3,3,4,4,5,5-hexafluorocyclopentene results in a higher heat transfer coefficient but also a higher dielectric constant, leading to weakened and distorted data signals transmitted in the fluid; furthermore, the dielectric strength decreases, resulting in poor insulation. In contrast, the fluid using a mixture of hydrofluoroolefin E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene and hexafluoropropylene trimer not only has a very low dielectric constant (less than 2), ensuring the integrity of data signals transmitted in the fluid, but also exhibits high dielectric strength and good insulation. This demonstrates that not all hydrofluoroolefins meet the requirements for use in immersion coolants.

[0146] The above description is merely a preferred embodiment of this application and is not intended to limit the application in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the protection scope of this application.

Claims

1. A single-phase, immersion, fluorochemical coolant wherein, The fluorine-containing coolant contains hexafluoropropylene trimer and hydrofluoroolefin, the molecular formula of the hexafluoropropylene trimer is C9F 18 , and the molecular formula of the hydrofluoroolefin is C9H2F 16 .

2. The fluoro-coolant of claim 1 wherein, The hexafluoropropylene trimer comprises 50-99% by mass percentage in the fluorinated coolant; The hydrofluoroolefin content is 1-50%.

3. The fluoro-coolant of claim 1 wherein, The hexafluoropropylene trimer is E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, or is derived from E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene. A mixture of hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene.

4. The fluoro-coolant of claim 1 wherein, The hexafluoropropylene trimer is E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene or Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene.

5. The fluoro-coolant of claim 3 wherein, When the hexafluoropropylene trimer is a mixture composed of E-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene, E-1, The mass percentages of 1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, Z-1,1,1,2,3,5,5,6,6,7,7,7-dodecano-2,4-bis(trifluoromethyl)hept-3-ene, 1,1,1,2,4,5,5,5-octafluoro-3-(perfluoropropane-2-yl)-4-(trifluoromethyl)pent-2-ene, and 1,1,1,4,5,5-heptafluoro-3-(perfluoroethyl)-2,4-bis(trifluoromethyl)pent-2-ene are 50-70∶10-49∶0-5∶5-20.

6. The fluorinated coolant according to claim 1, wherein, The hydrofluoroolefin is selected from E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, E-1,1,1,2,6,6,6-heptafluoro-2,5,5-tris(trifluoromethyl)-3-hexene, E-1,1,1,2,5,6,6,7,7,7-decafluoro-2,5-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,5,5,6,7,7,7 -Decafluoro-2,6-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,3,3,6,7,7,8,8,8-tetrazofluoro-6-(trifluoromethyl)-4-octene, E-1,1,1,2,2,3,3,6,6,7,8,8,8-tetrazofluoro-7-(trifluoromethyl)-4-octene, E-1,1,1,2,2,3,3,6,6,7,7,8,8,9,9,9-hexadecylfluoro-4-nonene, E-1,1,1,2,2,6,6,7,7,7-decafluoro-5,5-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,5,5,6,6,7,7,8,8,9,9,9-hexadecylfluoro-4-nonene, One or more of the following: fluoro-3-nonene, E-1,1,1,4,5,5,6,6,7,7,8,8,8-tetrafluoro-4-(trifluoromethyl)-2-octene, E-1,1,1,4,4,5,5,6,6,7,7,8,8,9,9,9-hexadecafluoro-2-nonene, E-1,1,1,5,5,6,6,7,7,7-decafluoro-2,2-bis(trifluoromethyl)-3-heptene, E-1,1,1,2,2,5,5,6,6,7,8,8,8-tetrafluoro-7-(trifluoromethyl)-3-octene, and E-1,1,1,5,5,6,6,7,7,7-decafluoro-4,4-bis(trifluoromethyl)-2-heptene.

7. The fluorinated coolant according to claim 1, wherein, The hydrofluoroolefin is selected from one, two, or three of the following: E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene, E-1,1,1,2,5,5,6,7,7,7-decafluoro-2,6-bis(trifluoromethyl)-3-heptene, and E-1,1,1,2,2,3,3,6,7,7,8,8,8-tetrafluoro-6-(trifluoromethyl)-4-octene.

8. The fluorinated coolant according to claim 1, wherein, The hydrofluoroolefin is E-1,1,1,2,5,5,6,6,7,7,8,8,8-tetrafluoro-2-(trifluoromethyl)oct-3-ene.

9. The fluorinated coolant according to any one of claims 1-8, wherein, The boiling point of the fluorinated coolant is 100-130℃, and / or The dielectric constant of the fluorinated coolant is less than 2.

10. Use of the fluorinated coolant according to any one of claims 1-9 in cooling servers, heat dissipation systems, communication equipment and / or lighting systems.

11. The use according to claim 10, wherein, The cooling is achieved by cooling the surfaces of servers, heat dissipation systems, communication equipment, and / or lighting systems in liquid phase.

12. A method for cooling a server, heat dissipation system, communication equipment, and / or lighting system using the fluorinated coolant according to any one of claims 1-9, comprising: Servers, cooling systems, communication equipment, and / or lighting systems are cooled by immersing them in a fluorinated coolant.

13. A heat transfer medium comprising the fluorinated coolant according to any one of claims 1-9.

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