A heat transfer composition, its preparation and use

Abstract

The application discloses a heat transfer composition and a preparation and application thereof. The heat transfer composition is composed of 50-98% of trans-1,2-difluoroethylene, 1-30% of 1,1-difluoropropylene and 1-35% of a third component in percentage by mass; the third component is difluoromethane and / or propane. The method for preparing the heat transfer composition comprises the following steps: uniformly mixing the trans-1,2-difluoroethylene, the 1,1-difluoropropylene and the third component in a liquid phase state to obtain the heat transfer composition. The heat transfer composition can be used in a heat exchange device. The heat transfer composition has higher liquid phase heat conductivity and lower liquid phase dynamic viscosity, and has higher heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of fluorocarbon composition technology, and more specifically to a heat transfer composition and its preparation and application. Background Technology

[0002] For decades, numerous industries have been working to find alternatives to ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). These substances are widely used in refrigerants, cleaning agents, foaming agents for foamed plastics (including thermoplastic and thermosetting foams), heat transfer media, fire extinguishing and flame retardants, power cycle working fluids, polymerization media, and displacement desiccants, among other applications. As alternatives, many industries have shifted to using hydrofluorocarbons (HFCs), hydrofluoroolefins (HFOs), and chlorofluoroolefins (HCFOs).

[0003] Currently, widely used HFC refrigerants (such as 1,1,1,2-tetrafluoroethane, difluoromethane R-32, and R-410A (a 1:1 mass mixture of difluoromethane and pentafluoroethane)) have zero ozone depletion potential (ODP), but generally high global warming potential (GWP). However, the use of HFC refrigerants is gradually being restricted, and the industry's demand for alternative refrigerants with lower GWPs is becoming increasingly urgent. Fourth-generation refrigerants, hydrofluoroolefins (HFOs) and chlorofluoroolefins (HCFOs) and their combinations, have been widely used in various industries. For example, 2,3,3,3-tetrafluoropropylene R-1234yf is used extensively in the automotive industry, and R-454B (a mixture of 68.9% R-32 and 31.1% R-1234yf by mass) is also used in air conditioning systems.

[0004] With industry development and technological advancements, the emergence of synthetic substances known as PFAS (per- and polyfluoroalkyl substances), a broad class of chemicals, known as permanent chemicals, has led to their widespread use due to their extreme stability. TFA (trifluoroacetic acid) is itself a type of PFAS, but it is also the final product of the atmospheric decomposition of many PFAS substances (especially certain refrigerants). Currently widely used fluorinated refrigerants, whether phasing out HFCs (hydrofluorocarbons, such as 1,1,1,2-tetrafluoroethane R-134a) or their replacements HFOs (hydrofluoroolefins, such as R-1234yf and 1,3,3,3-tetrafluoropropylene R-1234ze), are broadly classified as PFAS due to the presence of specific carbon-fluorine bonds. Industry data shows that HFOs decompose into TFA at a rate 10 times faster than HFCs. R-1234yf, a refrigerant widely used in automotive air conditioning, has been shown to degrade approximately 100% into TFA in the atmosphere. As a previous generation of mainstream refrigerant, R-134a has approximately 7%-20% that degrades into TFA. PFAS substances, due to their stable properties, are difficult to degrade in the natural environment, leading to environmental accumulation and health risks.

[0005] Existing technologies, such as CN117984721A, disclose compositions containing hexafluoropropylene, trifluoroethylene, and a third component selected from at least one of fluoropropylene, difluoropropylene, and difluoromethane. In this composition, hexafluoropropylene is a PFAS substance, which decomposes to produce TFA, and its toxicity limits its use. WO2025159947A1 discloses compositions containing 1,1-difluoropropylene, trans-1,2-difluoroethylene R-1132E, difluoromethane R-32, trifluoroiodomethane CF3I, tetrafluoroethane R-134, and carbon dioxide (CO2). However, CF3I has poor thermal stability, presents compatibility issues with general-purpose materials, and its high content poses potential health and environmental risks. High CO2 content and high pressure impose high requirements on system equipment.

[0006] Therefore, developing heat transfer compositions with low GWP, free from and decomposing without producing PFAS substances, excellent thermal performance, and the ability to directly replace existing working fluids has become a current research hotspot. Summary of the Invention

[0007] To address the aforementioned technical problems and shortcomings in the field, this invention provides a heat transfer composition, its preparation, and its applications. This composition has an ozone depletion potential (ODP) of zero, a global warming potential (GWP) of less than 150, contains no PFAS substances, and does not produce PFAS substances such as TFA upon decomposition. The composition exhibits excellent cooling, heating, and heat transfer performance, moderate operating pressure, good material compatibility, and good miscibility with lubricating oils. It can be applied to household air conditioners, automotive air conditioning systems, commercial air conditioners, heat pump systems, refrigeration equipment, industrial refrigeration equipment, data center cooling systems, and mobile refrigeration equipment, and can be widely used in refrigerants, heat transfer media, power circulation working fluids, aerosol propellants, foaming agents, and gaseous dielectrics.

[0008] The specific technical solution of this invention is as follows: In a first aspect, the present invention provides a heat transfer composition comprising, by mass percentage, 50% to 98% (e.g., 52%, 58%, 60%, 65%, 67%, 70%, 71%, 74%, 81%, 90%, etc.) of trans-1,2-difluoroethylene (R-1132E), 1% to 30% (e.g., 2%, 4%, 5%, 12%, 16%, 19%, 20.5%, 22%, etc.) of 1,1-difluoropropylene (R-1252zc), and 1% to 35% (e.g., 2%, 3%, 5%, 6%, 7%, 8%, 10%, 13%, 17%, 20%, 21.5%, 23%, 26%, etc.) of a third component; The third component is difluoromethane (R-32) and / or propane (R-290).

[0009] In some preferred embodiments, the heat transfer composition contains 58% to 90% trans-1,2-difluoroethylene by mass percentage.

[0010] In some preferred embodiments, the heat transfer composition contains 71% to 86% trans-1,2-difluoroethylene by mass percentage.

[0011] In some preferred embodiments, the heat transfer composition contains 4% to 20.5% 1,1-difluoropropylene by mass percentage.

[0012] In some preferred embodiments, the heat transfer composition contains 4% to 19% 1,1-difluoropropylene by weight percentage.

[0013] In some preferred embodiments, the third component in the heat transfer composition accounts for 6% to 21.5% by mass percentage.

[0014] In some preferred embodiments, the third component in the heat transfer composition accounts for 10% to 20% by mass percentage.

[0015] In some preferred embodiments, the third component is difluoromethane, suitable for the preferred proportions listed above.

[0016] In some preferred embodiments, the heat transfer composition contains 67% to 81% trans-1,2-difluoroethylene by mass percentage.

[0017] In some preferred embodiments, the heat transfer composition contains 74% to 81% trans-1,2-difluoroethylene by mass percentage.

[0018] In some preferred embodiments, the heat transfer composition contains 2% to 30% 1,1-difluoropropylene by mass percentage.

[0019] In some preferred embodiments, the heat transfer composition contains 2% to 16% 1,1-difluoropropylene by mass percentage.

[0020] In some preferred embodiments, the third component in the heat transfer composition accounts for 3% to 17% by mass percentage.

[0021] In some preferred embodiments, the third component in the heat transfer composition accounts for 10% to 17% by mass percentage.

[0022] In some preferred embodiments, the third component is propane, which is suitable for the preferred proportions listed above.

[0023] In some preferred embodiments, the heat transfer composition contains 52% to 65% trans-1,2-difluoroethylene by mass percentage.

[0024] In some preferred embodiments, the heat transfer composition contains 60% to 65% trans-1,2-difluoroethylene by mass percentage.

[0025] In some preferred embodiments, the heat transfer composition contains 5% to 22% 1,1-difluoropropylene by weight percentage.

[0026] In some preferred embodiments, the heat transfer composition contains 5% to 12% 1,1-difluoropropylene by mass percentage.

[0027] In some preferred embodiments, the third component is difluoromethane and propane, in the preferred proportions listed above.

[0028] In some preferred embodiments, the heat transfer composition contains 6% to 22% (e.g., 21%) of difluoromethane and 2% to 14% (e.g., 5%) of propane.

[0029] In some preferred embodiments, the heat transfer composition contains 10% to 21% difluoromethane and 5% to 14% propane.

[0030] Furthermore, the heat transfer composition has an ozone depletion potential (ODP) of zero and a global warming potential (GWP) of less than 150.

[0031] The heat transfer composition of this invention can directly contact materials and lubricating oil in the system. During high-temperature accelerated aging, the mass change of metallic materials is less than 5%, and the volume change is less than 10%; for non-metallic materials, the mass change is less than 10%, and the volume change is less than 20%. This indicates that the composition has good compatibility with materials. Metallic materials may include one or more of copper, iron, aluminum, brass, etc., and non-metallic materials may include at least one of plastic materials, sealing materials, etc. Plastic materials may include one or more of polyethylene (PE), epoxy resin, nylon, polyethylene terephthalate (PET), etc., and sealing materials may include one or more of nitrile rubber (NBR), ethylene propylene diene monomer (EPDM), butyl rubber (IIR), chloroprene rubber (CR), etc. Accelerated aging conditions may be: metallic materials: 175℃, 14 days; non-metallic materials: 125℃, 14 days.

[0032] In a second aspect, the present invention provides a method for preparing the heat transfer composition described in the first aspect, comprising: uniformly mixing trans-1,2-difluoroethylene, 1,1-difluoropropylene and a third component in a liquid phase to obtain the heat transfer composition.

[0033] Thirdly, the present invention provides a composition that can be used for heat transfer, comprising the heat transfer composition described in the first aspect and a lubricant (lubricating oil).

[0034] In some preferred embodiments, the lubricant comprises one or more of polyalkylene glycols, polyol esters (POE), polyalphaolefins, and polyvinyl ethers.

[0035] The heat transfer composition of this invention exhibits good compatibility with lubricating oil and shows no significant stratification at various proportions at low temperatures. The lubricating oil may include at least one of polyol esters (POE) and polyether lubricating oils (PAG), specifically including POE RL68H (Lubrizol), CP-4600-68 (Lubrizol), RM 68EX (Ruif), SUN PAG 100 (Sun), etc. At a lubricating oil proportion of 5wt% to 50wt%, within a temperature range of -30 to 55°C, the heat transfer composition and lubricating oil remain clear and transparent, without stratification, demonstrating good compatibility.

[0036] Fourthly, the present invention provides the application of the heat transfer composition described in the first aspect or the heat transfer composition described in the third aspect in a heat exchange device. Further, the heat exchange device includes, but is not limited to, household air conditioners, commercial air conditioners, heat pump systems, refrigeration equipment, industrial refrigeration equipment, automotive air conditioning systems, data center cooling systems, and mobile refrigeration equipment.

[0037] The above-described compositions can be widely used in refrigerants, heat transfer media, power circulating working fluids, aerosol propellants, foaming agents, and gaseous dielectrics, and can be used as working fluids in various heat exchange devices.

[0038] Compared with the prior art, the beneficial effects of this invention are as follows: 1. The heat transfer composition of the present invention has good heat transfer performance and high heat transfer efficiency in air conditioning systems.

[0039] 2. The heat transfer composition of the present invention has a low GWP value, does not contain PFAS substances, and does not produce trifluoroacetic acid (TFA).

[0040] 3. The heat transfer composition of the present invention has a higher liquid phase thermal conductivity and a lower liquid phase dynamic viscosity, resulting in higher heat exchange efficiency.

[0041] 4. The addition of difluoromethane (R-32) to the heat transfer composition of the present invention increases its lower flammability limit, making it safer to use. It also increases the liquid phase thermal conductivity of the composition and reduces the liquid phase dynamic viscosity.

[0042] 5. The heat transfer composition of this invention exhibits excellent thermochemical stability due to the addition of propane (R-290), which acts as a stabilizer, and is not easily decomposed during system operation. Simultaneously, the addition of this substance significantly reduces the dynamic viscosity of the liquid phase.

[0043] 6. The heat transfer composition of the present invention has good compatibility with materials and lubricating oil in the system and can operate stably for a long time; it has excellent compatibility with lubricating oil at low temperatures, high oil return rate, and improves the heat transfer performance of the evaporator. Detailed Implementation

[0044] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Operating methods not specifically specified in the following embodiments are generally performed under conventional conditions or as recommended by the manufacturer. The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values; these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0045] The present invention will demonstrate through experiments that the heat transfer composition of the present invention has suitable physical properties, excellent cooling and heating performance, higher heat exchange efficiency, stable chemical properties, is not easily decomposed, has good compatibility with materials, and good miscibility with lubricating oil.

[0046] Example 1: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: 90% trans-1,2-difluoroethylene (R-1132E), 4% 1,1-difluoropropylene (R-1252zc), and 6% difluoromethane (R-32). The mixture is shaken well after mixing.

[0047] Example 2: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: 71% trans-1,2-difluoroethylene (R-1132E), 19% 1,1-difluoropropylene (R-1252zc), and 10% difluoromethane (R-32). The mixture is shaken well after mixing.

[0048] Example 3: The following materials were physically mixed in the liquid phase to obtain a heat transfer composition. The materials were in the following mass ratios: 58% trans-1,2-difluoroethylene (R-1132E), 20.5% 1,1-difluoropropylene (R-1252zc), and 21.5% difluoromethane (R-32). The mixture was shaken well after mixing.

[0049] Example 4: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: 67% trans-1,2-difluoroethylene (R-1132E), 30% 1,1-difluoropropylene (R-1252zc), and 3% propane (R-290). The mixture is shaken well after mixing.

[0050] Example 5: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: 74% trans-1,2-difluoroethylene (R-1132E), 16% 1,1-difluoropropylene (R-1252zc), and 10% propane (R-290). The mixture is shaken well after mixing.

[0051] Example 6: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: 81% trans-1,2-difluoroethylene (R-1132E), 2% 1,1-difluoropropylene (R-1252zc), and 17% propane (R-290). The mixture is shaken well after mixing.

[0052] Example 7: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratios: 65% trans-1,2-difluoroethylene (R-1132E), 12% 1,1-difluoropropylene (R-1252zc), 21% difluoromethane (R-32), and 2% propane (R-290). The mixture is shaken well after mixing.

[0053] Example 8: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratios: 52% trans-1,2-difluoroethylene (R-1132E), 22% 1,1-difluoropropylene (R-1252zc), 21% difluoromethane (R-32), and 5% propane (R-290). The mixture is shaken well after mixing.

[0054] Example 9: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratios: 60% trans-1,2-difluoroethylene (R-1132E), 5% 1,1-difluoropropylene (R-1252zc), 21% difluoromethane (R-32), and 14% propane (R-290). The mixture is shaken well after mixing.

[0055] Comparative Example 1: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The mass ratio of the materials is: 70% trans-1,2-difluoroethylene (R-1132E) and 30% 1,1-difluoropropylene (R-1252zc). The mixture is shaken well after mixing.

[0056] Comparative Example 2: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: 50% trans-1,2-difluoroethylene (R-1132E) and 50% 1,1-difluoropropylene (R-1252zc). The mixture is shaken well after mixing.

[0057] Comparative Example 3: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The mass ratio of the materials is: 30% trans-1,2-difluoroethylene (R-1132E) and 70% 1,1-difluoropropylene (R-1252zc). The mixture is shaken well after mixing.

[0058] Comparative Example 4: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: 9% trans-1,2-difluoroethylene (R-1132E), 86% 1,1-difluoropropylene (R-1252zc), and 5% difluoromethane (R-32). The mixture is shaken well after mixing.

[0059] Comparative Example 5: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: trans-1,2-difluoroethylene (R-1132E) 45%, 1,1-difluoropropylene (R-1252zc) 48%, and difluoromethane (R-32) 7%. The mixture is shaken well after mixing.

[0060] Comparative Example 6: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: 20% trans-1,2-difluoroethylene (R-1132E), 67% 1,1-difluoropropylene (R-1252zc), and 13% difluoromethane (R-32). The mixture is shaken well after mixing.

[0061] Comparative Example 7: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: trans-1,2-difluoroethylene (R-1132E) 4%, 1,1-difluoropropylene (R-1252zc) 90%, and propane (R-290) 6%. The mixture is shaken well after mixing.

[0062] Comparative Example 8: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratio: trans-1,2-difluoroethylene (R-1132E) 49%, 1,1-difluoropropylene (R-1252zc) 49%, and propane (R-290) 2%. The mixture is shaken well after mixing.

[0063] Comparative Example 9: The following materials were physically mixed in the liquid phase to obtain a heat transfer composition. The materials were in the following mass ratios: trans-1,2-difluoroethylene (R-1132E) 49%, 1,1-difluoropropylene (R-1252zc) 31%, difluoromethane (R-32) 14%, and propane (R-290) 6%. The mixture was shaken well after mixing.

[0064] Comparative Example 10: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratios: trans-1,2-difluoroethylene (R-1132E) 6%, 1,1-difluoropropylene (R-1252zc) 89%, difluoromethane (R-32) 2%, and propane (R-290) 3%. The mixture is shaken well after mixing.

[0065] Comparative Example 11: The following materials are physically mixed in the liquid phase to obtain a heat transfer composition. The materials are in the following mass ratios: trans-1,2-difluoroethylene (R-1132E) 32%, 1,1-difluoropropylene (R-1252zc) 60%, difluoromethane (R-32) 4%, and propane (R-290) 4%. The mixture is shaken well after mixing.

[0066] Physical properties: The physical properties of the above embodiments and comparative examples are shown in Table 1, where the liquid phase thermal conductivity and liquid phase dynamic viscosity are values ​​at 23°C.

[0067] Table 1 As shown in Table 1, the average boiling point of the embodiments of the present invention is not significantly different from that of R-410A (a mixture of difluoromethane R-32 and pentafluoroethane R-125 in a 1:1 mass ratio), and can be directly applied to existing systems. The addition of R-32 and R-290 in the present invention results in higher liquid phase thermal conductivity and lower liquid phase dynamic viscosity, leading to higher heat transfer efficiency. The inclusion of R-32 in the heat transfer composition of the present invention increases the lower flammability limit of the composition, improving safety performance. Furthermore, the heat transfer compositions of the present invention all have a GWP of less than 150 and are free of PFAS substances, exhibiting superior environmental performance.

[0068] Performance testing: The above embodiments and comparative examples were tested in an air conditioning enthalpy difference chamber. The test conditions were: evaporation temperature 5℃, condensation temperature 45℃, superheating temperature 10 K, and subcooling temperature 5 K. The test results are shown in Table 2. The relative cooling capacity, heating capacity, and relative COP (energy efficiency ratio) were compared with those of Comparative Example 2.

[0069] Table 2 According to the test results in Table 2, the heat transfer compositions in the embodiments were able to improve both cooling capacity and coefficient of performance (COP). The comparative compositions, however, could not simultaneously improve both cooling capacity and energy efficiency. This demonstrates that within the component ratio range of the present invention, better technical effects are achieved.

[0070] Thermal stability test: During the operation of a refrigeration system, the refrigerant must possess excellent chemical stability to prevent performance degradation or equipment failure due to decomposition. Compared to saturated alkanes, alkenes containing carbon-carbon double bonds are more chemically reactive due to the presence of unsaturated bonds, and are more prone to oxidation, polymerization, and other decomposition reactions under high temperatures or metal catalysis. Currently widely used HFO refrigerants are olefin derivatives, and the double bonds in their molecular structure pose a significant challenge to their stability. Therefore, in engineering, appropriate stabilizers are typically added to HFO refrigerants to effectively inhibit the decomposition process through mechanisms such as capturing free radicals, passivating active metal ions, or blocking chain reactions. This measure can significantly extend the service life of the refrigerant and ensure the long-term, safe, and efficient operation of the refrigeration system.

[0071] Since the components in the heat transfer composition of this invention can be used as stabilizers, thermal stability tests will be conducted to verify their effectiveness. In the experiment, some examples and comparative examples were placed in a high-pressure reactor at 175°C for 30 days, and the changes in the composition of the composition before and after aging were tested. The test results are shown in Table 3 (unit: mass percentage).

[0072] Table 3 Based on the above test results, the addition of R-290 can significantly improve the stability of the heat transfer composition, reduce the impurities generated by decomposition from 5.9% to 1.8%, inhibit the polymerization of olefin refrigerants without affecting the properties of the blend, effectively extend the service life of the refrigerant, and ensure the long-term, safe and efficient operation of the refrigeration system.

[0073] Material compatibility testing: The tests were performed according to the glass tube sealing method in "Test Methods for Sealed Glass Tubes, for Testing the Chemical Stability of Materials Used in Refrigerant Systems" (ANSI / ASHRAE Standard 97-2007 (RA 2017)). The main focus was on detecting changes in the mass and dimensions of the material before and after aging to determine its compatibility with the refrigerant and lubricant. The experimental conditions for metallic materials were 175℃ for 14 days, and for non-metallic materials, they were 125℃ for 14 days. The results are shown in Tables 4, 5, and 6.

[0074] Table 4 Compatibility test results of metallic materials Table 5 Compatibility test results of plastic materials Table 6 Compatibility test results of sealing materials The test results above show that the mass change of the heat transfer composition in each embodiment is less than 5% and the volume change is less than 10% for commonly used metal parts in air conditioning systems. The mass change of non-metals is less than 10% and the volume change is less than 20%. This indicates that the heat transfer composition has good compatibility with materials, ensuring long-term stable operation of the system and reducing maintenance costs.

[0075] Lubricating oil compatibility test: The compatibility test results of the examples with different types of lubricating oils are shown in Table 7. All the lubricating oils listed in Table 7 can be obtained through commercial channels.

[0076] Table 7 For each embodiment mentioned in Table 7, compatibility tests were performed with lubricating oil proportions of 5wt%, 10wt%, 20wt%, 30wt%, and 50wt% (based on the total mass of lubricating oil and the corresponding embodiment's heat transfer composition). The results were all clear and without stratification.

[0077] The results show that when the lubricating oil ratio is 5wt% to 50wt%, and the temperature is within the range of -30 to 55℃, the heat transfer composition is clear and transparent after mixing with various lubricating oils, without stratification, and has good compatibility.

[0078] Furthermore, it should be understood that after reading the above description of the present invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A heat transfer composition, characterized in that, By mass percentage, it consists of 50% to 98% trans-1,2-difluoroethylene, 1% to 30% 1,1-difluoropropylene and 1% to 35% of a third component; The third component is difluoromethane and / or propane.

2. The heat transfer composition according to claim 1, characterized in that, The heat transfer composition contains 58% to 90% trans-1,2-difluoroethylene by mass percentage.

3. The heat transfer composition according to claim 2, characterized in that, The heat transfer composition contains 71% to 86% trans-1,2-difluoroethylene by mass percentage.

4. The heat transfer composition according to claim 1, characterized in that, The heat transfer composition contains 4% to 20.5% 1,1-difluoropropylene by weight percentage.

5. The heat transfer composition according to claim 4, characterized in that, The heat transfer composition contains 4% to 19% 1,1-difluoropropylene by weight percentage.

6. The heat transfer composition according to claim 1, characterized in that, The third component in the heat transfer composition accounts for 6% to 21.5% by mass percentage.

7. The heat transfer composition according to claim 6, characterized in that, The third component in the heat transfer composition accounts for 10% to 20% by mass percentage.

8. The heat transfer composition according to any one of claims 2 to 7, characterized in that, The third component is difluoromethane.

9. The heat transfer composition according to claim 1, characterized in that, The heat transfer composition contains 67% to 81% trans-1,2-difluoroethylene by mass percentage.

10. The heat transfer composition according to claim 9, characterized in that, The heat transfer composition contains 74% to 81% trans-1,2-difluoroethylene by mass percentage.

11. The heat transfer composition according to claim 1, characterized in that, The heat transfer composition contains 2% to 30% 1,1-difluoropropylene by weight percentage.

12. The heat transfer composition according to claim 11, characterized in that, The heat transfer composition contains 2% to 16% 1,1-difluoropropylene by weight percentage.

13. The heat transfer composition according to claim 1, characterized in that, The third component in the heat transfer composition accounts for 3% to 17% by mass percentage.

14. The heat transfer composition according to claim 13, characterized in that, The third component in the heat transfer composition accounts for 10% to 17% by mass percentage.

15. The heat transfer composition according to any one of claims 9 to 14, characterized in that, The third component is propane.

16. The heat transfer composition according to claim 1, characterized in that, The heat transfer composition contains 52% to 65% trans-1,2-difluoroethylene by mass percentage.

17. The heat transfer composition according to claim 16, characterized in that, The heat transfer composition contains 60% to 65% trans-1,2-difluoroethylene by mass percentage.

18. The heat transfer composition according to claim 1, characterized in that, The heat transfer composition contains 5% to 22% 1,1-difluoropropylene by weight percentage.

19. The heat transfer composition according to claim 18, characterized in that, The heat transfer composition contains 5% to 12% 1,1-difluoropropylene by weight percentage.

20. The heat transfer composition according to any one of claims 16 to 19, characterized in that, The third component is difluoromethane and propane; The heat transfer composition contains 6% to 22% difluoromethane and 2% to 14% propane.

21. The heat transfer composition according to claim 20, characterized in that, The heat transfer composition contains 10% to 21% difluoromethane and 5% to 14% propane.

22. The heat transfer composition according to claim 1, characterized in that, The heat transfer composition has an ozone depletion potential of zero and a global warming potential of less than 150.

23. A method for preparing the heat transfer composition according to any one of claims 1 to 22, characterized in that, include: The heat transfer composition is obtained by uniformly mixing trans-1,2-difluoroethylene, 1,1-difluoropropylene and the third component in the liquid phase.

24. A composition that can be used for heat transfer, characterized in that, Includes the heat transfer composition and lubricant as described in any one of claims 1 to 22.

25. The composition for heat transfer according to claim 24, characterized in that, The lubricant includes one or more of polyalkylene glycols, polyol esters, polyalphaolefins, and polyvinyl ethers.

26. The use of the heat transfer composition according to any one of claims 1 to 22 or the composition for heat transfer according to claim 24 or 25 in a heat exchange device.

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