A refrigerant composition suitable for automobile electric compressor

Abstract

The present invention provides a refrigerant composition suitable for an automotive electric compressor, belonging to the technical field of refrigeration materials, wherein the refrigerant composition includes nano-silicon dioxide, polypropylene glycol, zinc dialkyl dithiophosphate, methyl benzotriazole, IRMOF-1, triethylene glycol, a surfactant and a refrigerant; each component is used in combination according to a specific ratio, and can improve the stability of the system, reduce the refrigeration temperature, and is not easy to wear the compressor parts under high voltage, high speed and high temperature environments. Compared with refrigerant R134a and refrigerant R1234yf, the various components added to the refrigerant composition of the present invention can optimize the refrigeration cycle, improve the heat exchange performance of the refrigerant, enable the refrigeration system to obtain a lower temperature under the same power input, and improve the refrigeration effect; the addition of components such as antioxidants and rust inhibitors can effectively prevent corrosion and oxidation of system components, reduce the probability of failure, extend the service life of the system, and reduce maintenance costs.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration materials, and in particular relates to a refrigerant composition suitable for an automobile electric compressor. Background Art

[0002] With the booming development of the new energy vehicle industry, its related technologies are also constantly innovating, and the air conditioning system is one of the important aspects. Compared with traditional fuel vehicles, the air conditioning system of new energy vehicles has undergone significant changes. New energy vehicles mainly rely on electric energy to drive, and the core component of their air conditioning system, the electric compressor, plays a key role in the entire vehicle operation.

[0003] According to market feedback, electric compressor damage has become one of the problems with a high maintenance failure rate in new energy vehicles. After further investigation, we found that most electric compressors currently use a scroll structure. The compressor under this structure has several significant characteristics when working: high speed, which often reaches a high level, causing the internal components to bear greater centrifugal force and friction; high temperature, which generates a lot of heat during operation, and puts strict requirements on the heat resistance of the material; high voltage, and the high voltage environment has higher standards for related performance such as electrical insulation.

[0004] Moreover, the air conditioning system of new energy vehicles is more complex. It not only meets the cooling needs of the car, but also participates in the thermal management of batteries and electronic controls. This means that its working time is greatly increased compared to traditional fuel vehicles.

[0005] In addition, most new energy vehicles use heat pump air conditioners. Although this design has advantages in terms of energy efficiency, it poses new challenges to the compressor. On the one hand, it greatly increases the working time of the compressor. On the other hand, when heating in winter, due to the working principle of heat pump air conditioners, the refrigerant is not completely vaporized in a low temperature environment. This incomplete vaporization state will change the lubrication and stress conditions inside the compressor, aggravating the wear of the compressor, which in turn leads to a significant decrease in the service life of the compressor and makes it more prone to damage.

[0006] At present, the refrigerants commonly used in electric compressors of new energy vehicles include R134a. This refrigerant has some defects. Under the low-temperature heating conditions of the heat pump system, its heating efficiency will decrease significantly as the temperature decreases, affecting the overall performance of the air-conditioning system. In addition, R134a has a high greenhouse gas potential value, which has a certain negative impact on the environment. At the same time, due to the special working conditions of the air-conditioning system of new energy vehicles, R134a may have problems such as changes in chemical stability under high voltage, high speed and high temperature environment, further affecting the stable operation of the compressor and the entire air-conditioning system. Summary of the invention

[0007] In view of the fact that the electric compressors in the prior art are easily damaged, and the commonly used refrigerants affect the overall performance of the air-conditioning system. The present invention provides a refrigerant composition suitable for automotive electric compressors, the refrigerant composition comprising nano-silicon dioxide, polypropylene glycol, zinc dialkyl dithiophosphate, methyl benzotriazole, IRMOF-1, triethylene glycol, a surfactant and a refrigerant; the components are used in combination according to a specific ratio, which can improve the stability of the system, reduce the refrigeration temperature, and not easily wear the compressor parts under high voltage, high speed and high temperature environment. The specific technical scheme is as follows:

[0008] A refrigerant composition suitable for an automobile electric compressor, the refrigerant composition comprising the following raw materials in percentage by mass: 1% to 1.5% nano silicon dioxide, 0.2% to 1% polypropylene glycol, 0.5% to 1.0% zinc dialkyl dithiophosphate, 0.1% to 0.5% toluene triazole, 0.1% to 0.3% IRMOF-1, 0.5% to 1% triethylene glycol, 0.1% to 0.5% surfactant, and the balance being refrigerant.

[0009] In the above refrigerant composition, the refrigerant is at least one of refrigerant R134a and refrigerant R1234yf.

[0010] In the above refrigerant composition, the surfactant is at least one of a polyoxyethylene fatty alcohol ether surfactant and a fluorocarbon surfactant.

[0011] In the above refrigerant composition, the polypropylene glycol is PPG2000.

[0012] In the above refrigerant composition, the polyoxyethylene fatty alcohol ether active agent is Tween20.

[0013] In the above refrigerant composition, the structural formula of the IRMOF-1 is Zn4O(BDC)3, and the median particle size is 100 μm to 150 μm.

[0014] In the above refrigerant composition, the particle size range of the nano-silicon dioxide is below 200 nm.

[0015] In the above refrigerant composition, the preparation method of the refrigerant composition comprises the following steps:

[0016] S1: Mix nano-silica and IRMOF-1 evenly by airflow to obtain mixed powder A;

[0017] S2: Add the surfactant to the refrigerant, mix and disperse evenly, then add the mixed powder A to mix and disperse evenly; then add methyl benzotriazole to mix and disperse evenly; finally, add polypropylene glycol, zinc dialkyl dithiophosphate and triethylene glycol in sequence, mix and disperse evenly, and obtain a refrigerant composition.

[0018] In S1 of the above preparation method, the air flow velocity of the air flow mixing is 10m / s to 15m / s, and the mixing time is 30min to 45min.

[0019] The present invention provides a refrigerant composition suitable for an automotive electric compressor, which has the following beneficial effects compared with the prior art:

[0020] 1. The refrigerant composition of the present invention comprises nano-silicon dioxide, polypropylene glycol, zinc dialkyl dithiophosphate, methyl benzotriazole, IRMOF-1, triethylene glycol, a surfactant and a refrigerant. The components are used in combination according to a specific ratio, which can improve the stability of the system, reduce the refrigeration temperature, and is not easy to wear the compressor parts under high voltage, high speed and high temperature environment.

[0021] 2. Nano-silicon dioxide has a small size effect and a surface effect, which can enhance the friction stress between the moving disk and the stationary disk in the scroll electric compressor. Its huge specific surface area can adsorb impurities, keep the system clean, and improve the wear resistance of the composition, reducing the wear of the compressor parts. Nano-silicon dioxide can increase the strength and stability of the composition, thereby helping to reduce the refrigeration temperature.

[0022] 3. Polypropylene glycol can reduce the friction resistance of the compressor during operation, reduce energy consumption and component wear, and at the same time has a certain defoaming performance, which can prevent the composition from generating too many bubbles during the circulation process, affecting the refrigeration effect, and reduce the surface temperature of the electric compressor during operation, thereby helping to improve the refrigeration effect.

[0023] 4. Zinc dialkyl dithiophosphate is an antioxidant and extreme pressure anti-wear agent, which can prevent the refrigerant and other components in the composition from oxidizing and deteriorating under high temperature and high pressure, thereby extending the service life. It can also form a protective film on the surface of the metal parts of the compressor, reduce friction and wear, help improve the stability of the refrigerant, reduce the surface temperature of the electric compressor when it is working, and help improve the refrigeration effect.

[0024] 5. Toluene triazole is mainly used as a metal rust inhibitor and corrosion inhibitor to prevent the metal parts of the compressor from rusting and corroding, protect the normal operation of the system, promote the reduction of wear of compressor parts, and also help improve the stability of the refrigerant and assist in improving the refrigeration effect.

[0025] 6. IRMOF-1 has a large specific surface area and porosity, which can absorb moisture and other impurities in the refrigerant to purify it. It can also adjust the physical and chemical properties of the composition, optimize the performance of the refrigeration cycle, increase the strength and stability of the composition, and thus help to lower the refrigeration temperature and reduce the wear of compressor parts.

[0026] 7. Triethylene glycol acts as a solvent and desiccant to dissolve other ingredients and mix the composition evenly. It also absorbs moisture in the system to prevent moisture from freezing in low-temperature areas and clogging pipes, and prevents the refrigerated oil from acidifying.

[0027] 8. Surfactants can reduce the surface tension of the composition, improve its wettability and spreadability on the metal surface, enhance the refrigeration effect, prevent agglomeration and precipitation between the components, maintain the stability of the composition, and enhance the oil return rate of the compressor of the refrigeration oil.

[0028] 9. Both nano-silica and IRMOF-1 have large specific surface areas. After the airflow is mixed, the two can work synergistically. Nano-silica can fill the pores of IRMOF-1, further increase the specific surface area, and improve the adsorption capacity of impurities; at the same time, the combination of the two can enhance the structural stability of the composition, making it less likely to decompose and deteriorate during the high-temperature and high-pressure refrigeration cycle, thereby improving the overall performance and service life of the refrigerant composition.

[0029] In the preparation method, air flow mixing can make nano-silica and IRMOF-1 fully contact and collide under the drive of high-speed airflow, which is easier to achieve uniform mixing than traditional stirring and mixing methods. Since these two substances play an important role in the composition such as adsorbing impurities, uniform mixing helps them to be evenly distributed in the whole system, so as to better play their respective functions. Nano-silica particles with a particle size below 200nm tend to agglomerate. The high-speed airflow during air flow mixing can effectively disperse the nano-silica particles and reduce agglomeration. At the same time, it can also make IRMOF-1 and nano-silica fully dispersed to prevent excessive local concentration and ensure the stable quality of mixed powder A.

[0030] 10. Compared with refrigerant R134a and refrigerant R1234yf, the refrigerant composition of the present invention has the following advantages: (1) Higher refrigeration efficiency: the added various components can optimize the refrigeration cycle, improve the heat exchange performance of the refrigerant, enable the refrigeration system to obtain a lower temperature under the same power input, and improve the refrigeration effect. (2) Better system stability: the addition of antioxidants, rust inhibitors and other components can effectively prevent corrosion and oxidation of system components, reduce the probability of failure, extend the service life of the system, and reduce maintenance costs. (3) Higher safety: Refrigerant R1234yf has certain flammability and poses certain safety hazards during use and storage. The refrigerant composition of the present invention adds a variety of flame retardant and stabilizing components, which improves its safety and reduces the risk of fire and explosion. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific implementation cases, but the present invention is not limited to these embodiments.

[0032] Example 1

[0033] A refrigerant composition suitable for an automotive electric compressor, the refrigerant composition comprising the following raw materials in mass percentage: 1.5% nano-silicon dioxide, 1% polypropylene glycol, 1.0% zinc dialkyl dithiophosphate, 0.5% methyl benzotriazole, 0.3% IRMOF-1, 1% triethylene glycol, 0.5% surfactant, and the remainder being refrigerant. Among them, the refrigerant is refrigerant R1234yf; the surfactant is polyoxyethylene fatty alcohol ether active agent; the polypropylene glycol is PPG2000; the polyoxyethylene fatty alcohol ether active agent is Tween20; the structural formula of IRMOF-1 is Zn4O(BDC)3, and the median particle size is 126μm; the particle size range of nano-silicon dioxide is below 200nm.

[0034] The method for preparing the refrigerant composition comprises the following steps:

[0035] S1: Mix the nano-silica and IRMOF-1 at an air flow rate of 12 m / s for 40 min until they are uniform, to obtain mixed powder A;

[0036] S2: adding a surfactant to the refrigerant, mixing and dispersing at a stirring speed of 900 r / min for 18 minutes, so that the surfactant is fully and evenly dispersed in the refrigerant; then adding mixed powder A, mixing and dispersing at a stirring speed of 700 r / min for 25 minutes, ensuring that the mixed powder A is evenly dispersed in the system; then adding methyl benzotriazole, mixing and dispersing at a stirring speed of 550 r / min for 12 minutes, so that the methyl benzotriazole is evenly dispersed; finally, adding polypropylene glycol, zinc dialkyl dithiophosphate and triethylene glycol in sequence, mixing and dispersing at a stirring speed of 450 r / min for 25 minutes until uniform, to obtain a refrigerant composition;

[0037] During the entire mixing process, the reaction vessel is jacketed and the temperature is controlled to float between 22°C and 28°C by circulating water.

[0038] Example 2

[0039] A refrigerant composition suitable for an automotive electric compressor, the refrigerant composition comprising the following raw materials in mass percentage: 1% nano silicon dioxide, 0.2% polypropylene glycol, 0.5% zinc dialkyl dithiophosphate, 0.1% methyl benzotriazole, 0.1% IRMOF-1, 0.5% triethylene glycol, 0.1% surfactant, and the remainder being refrigerant. Among them, the refrigerant is refrigerant R134a; the surfactant is a fluorocarbon surfactant; the polypropylene glycol is PPG2000; the polyoxyethylene fatty alcohol ether active agent is Tween20; the structural formula of IRMOF-1 is Zn4O(BDC)3, and the median particle size is 134μm; the particle size range of nano silicon dioxide is below 200nm.

[0040] The method for preparing the refrigerant composition comprises the following steps:

[0041] S1: Mix the nano-silica and IRMOF-1 at an air flow rate of 10 m / s for 30 min until they are uniform, to obtain mixed powder A;

[0042] S2: adding a surfactant to the refrigerant, mixing and dispersing at a stirring speed of 800 r / min for 15 minutes, so that the surfactant is fully and evenly dispersed in the refrigerant; then adding mixed powder A, mixing and dispersing at a stirring speed of 600 r / min for 20 minutes, ensuring that the mixed powder A is evenly dispersed in the system; then adding methyl benzotriazole, mixing and dispersing at a stirring speed of 500 r / min for 10 minutes, so that the methyl benzotriazole is evenly dispersed; finally, adding polypropylene glycol, zinc dialkyl dithiophosphate and triethylene glycol in sequence, mixing and dispersing at a stirring speed of 400 r / min for 20 minutes until uniform, to obtain a refrigerant composition;

[0043] During the entire mixing process, the reaction vessel is jacketed and the temperature is controlled to float between 20°C and 25°C by circulating water.

[0044] Example 3

[0045] A refrigerant composition suitable for an automotive electric compressor, the refrigerant composition comprising the following raw materials in mass percentage: 1.25% nano-silicon dioxide, 0.6% polypropylene glycol, 0.75% zinc dialkyl dithiophosphate, 0.3% methyl benzotriazole, 0.2% IRMOF-1, 0.75% triethylene glycol, 0.3% surfactant, and the remainder being refrigerant. The refrigerant is a mixture of refrigerant R134a and refrigerant R1234yf in a mass ratio of 1:2; the surfactant is a mixture of polyoxyethylene fatty alcohol ether active agent and fluorocarbon surfactant in an equal mass ratio; the polypropylene glycol is PPG2000; the polyoxyethylene fatty alcohol ether active agent is Tween20; the structural formula of IRMOF-1 is Zn4O(BDC)3, and the median particle size is 100 μm; and the particle size range of nano-silicon dioxide is below 200 nm.

[0046] The method for preparing the refrigerant composition comprises the following steps:

[0047] S1: Mix the nano-silica and IRMOF-1 at an air flow rate of 15 m / s for 45 min until they are uniform, to obtain mixed powder A;

[0048] S2: adding a surfactant to the refrigerant, mixing and dispersing at a stirring speed of 1000 r / min for 20 minutes, so that the surfactant is fully and evenly dispersed in the refrigerant; then adding mixed powder A, mixing and dispersing at a stirring speed of 800 r / min for 30 minutes, ensuring that the mixed powder A is evenly dispersed in the system; then adding methyl benzotriazole, mixing and dispersing at a stirring speed of 600 r / min for 15 minutes, so that the methyl benzotriazole is evenly dispersed; finally, adding polypropylene glycol, zinc dialkyl dithiophosphate and triethylene glycol in sequence, mixing and dispersing at a stirring speed of 500 r / min for 30 minutes until uniform, to obtain a refrigerant composition;

[0049] During the entire mixing process, the reaction vessel is jacketed and the temperature is controlled to float between 24°C and 30°C by circulating water.

[0050] Example 4

[0051] A refrigerant composition suitable for an automotive electric compressor, the refrigerant composition comprising the following raw materials in mass percentage: 1% nano silicon dioxide, 1% polypropylene glycol, 0.5% zinc dialkyl dithiophosphate, 0.5% methyl benzotriazole, 0.1% IRMOF-1, 1% triethylene glycol, 0.1% surfactant, and the remainder being refrigerant. The refrigerant is a mixture of refrigerant R134a and refrigerant R1234yf in equal mass ratios; the surfactant is a polyoxyethylene fatty alcohol ether active agent; the polypropylene glycol is PPG2000; the polyoxyethylene fatty alcohol ether active agent is Tween20; the structural formula of IRMOF-1 is Zn4O(BDC)3, and the median particle size is 150 μm; and the particle size range of nano silicon dioxide is below 200 nm.

[0052] The method for preparing the refrigerant composition comprises the following steps:

[0053] S1: Mix the nano-silica and IRMOF-1 at an air flow rate of 10 m / s for 45 min until they are uniform, to obtain mixed powder A;

[0054] S2: adding a surfactant to the refrigerant, mixing and dispersing at a stirring speed of 800 r / min for 20 minutes, so that the surfactant is fully and evenly dispersed in the refrigerant; then adding mixed powder A, mixing and dispersing at a stirring speed of 600 r / min for 30 minutes, ensuring that the mixed powder A is evenly dispersed in the system; then adding methyl benzotriazole, mixing and dispersing at a stirring speed of 500 r / min for 15 minutes, so that the methyl benzotriazole is evenly dispersed; finally, adding polypropylene glycol, zinc dialkyl dithiophosphate and triethylene glycol in sequence, mixing and dispersing at a stirring speed of 400 r / min for 30 minutes until uniform, to obtain a refrigerant composition;

[0055] During the entire mixing process, the reaction vessel is jacketed and the temperature is controlled to float between 24°C and 28°C by circulating water.

[0056] Example 5

[0057] A refrigerant composition suitable for an automotive electric compressor, the refrigerant composition comprising the following raw materials in mass percentage: 1.5% nano-silicon dioxide, 0.2% polypropylene glycol, 1.0% zinc dialkyl dithiophosphate, 0.1% methyl benzotriazole, 0.3% IRMOF-1, 0.5% triethylene glycol, 0.5% surfactant, and the balance being refrigerant. The refrigerant is a mixture of refrigerant R134a and refrigerant R1234yf in a mass ratio of 2:1; the surfactant is a fluorocarbon surfactant; the polypropylene glycol is PPG2000; the polyoxyethylene fatty alcohol ether active agent is Tween20; the structural formula of IRMOF-1 is Zn4O(BDC)3, and the median particle size is 145 μm; and the particle size range of nano-silicon dioxide is below 200 nm.

[0058] The method for preparing the refrigerant composition comprises the following steps:

[0059] S1: Mix the nano-silica and IRMOF-1 at an air flow rate of 15 m / s for 30 min until they are uniform, to obtain mixed powder A;

[0060] S2: adding a surfactant to the refrigerant, mixing and dispersing at a stirring speed of 1000 r / min for 15 minutes, so that the surfactant is fully and evenly dispersed in the refrigerant; then adding mixed powder A, mixing and dispersing at a stirring speed of 800 r / min for 20 minutes, ensuring that the mixed powder A is evenly dispersed in the system; then adding methyl benzotriazole, mixing and dispersing at a stirring speed of 600 r / min for 10 minutes, so that the methyl benzotriazole is evenly dispersed; finally, adding polypropylene glycol, zinc dialkyl dithiophosphate and triethylene glycol in sequence, mixing and dispersing at a stirring speed of 500 r / min for 20 minutes until uniform, to obtain a refrigerant composition;

[0061] During the entire mixing process, the reaction vessel is jacketed and the temperature is controlled to float between 25°C and 30°C by circulating water.

[0062] In the above embodiments, IRMOF-1 is sourced from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd.; toluene triazole is sourced from Shandong Kasong New Materials Co., Ltd.

[0063] Comparative Example 1

[0064] All use refrigerant R134a.

[0065] Comparative Example 2

[0066] All use refrigerant R1234yf.

[0067] Comparative Example 3

[0068] No nano-silicon dioxide is added to the refrigerant composition, and the content of nano-silicon dioxide is replaced by the refrigerant; other parameters and methods are the same as in Example 1.

[0069] Comparative Example 4

[0070] No IRMOF-1 is added to the refrigerant composition, and the content of IRMOF-1 is replaced by refrigerant; other parameters and methods are the same as in Example 1.

[0071] Comparative Example 5

[0072] Nano-silicon dioxide and IRMOF-1 are not added to the refrigerant composition at the same time, and the contents of nano-silicon dioxide and IRMOF-1 are replaced by refrigerant; other parameters and methods are the same as in Example 1.

[0073] Comparative Example 6

[0074] No methylbenzotriazole is added to the refrigerant composition, and the content of methylbenzotriazole is replaced by the refrigerant; other parameters and methods are the same as in Example 1.

[0075] The refrigerant composition samples of the above-mentioned embodiments and comparative examples were subjected to performance tests.

[0076] The experiment adopts the second refrigerant calorimeter method defined in GB / T 5773 "Performance test method for volumetric refrigerant compressors". The experimental compressor uses a variable frequency scroll compressor for Highly electric vehicles, the compressor uses refrigeration oil POE68, and the compressor displacement is 34×10 -6 m 3 The experimental conditions refer to the nominal conditions in 4.3 of GB / T 22068 "Electric compressor assembly for automotive air conditioner". The compressor speed is set at 4500r / min. The experimental data are shown in Table 1 below:

[0077] Table 1 Refrigeration capacity test results

[0078]

[0079] It can be seen from the above results that the refrigerant composition samples of Examples 1 to 5 have good and stable refrigeration effects, and the overall refrigeration temperature is lower. It can be seen from the results of Comparative Examples 1 and 2 that the use of refrigerant R134a or refrigerant R1234yf alone will increase the surface temperature and exhaust temperature of the compressor, and the increase is significantly larger. It can be seen from the results of Comparative Example 3 that nano-silicon dioxide can improve heat transfer performance, and its lack may cause the surface temperature and exhaust temperature of the compressor to increase. It can be seen from the results of Comparative Example 4 that not adding IRMOF-1 affects the cycle performance of the refrigerant and causes the temperature to increase. It can be seen from the results of Comparative Example 5 that without adding nano-silicon dioxide and IRMOF-1 at the same time, the temperature increase is greatly increased. It can be seen from the results of Comparative Example 6 that not adding methyl benzotriazole affects the chemical stability of the refrigerant, etc., which in turn affects the temperature and causes the temperature to increase.

[0080] The refrigerant composition of Example 1 and the refrigerants of Comparative Examples 1 to 6 were used continuously for 6 months, and the wear of the compressor parts was observed. The degree of wear was from large to small as follows: Comparative Example 1, Comparative Example 2, Comparative Example 4, Comparative Example 3, Comparative Example 6, Comparative Example 5, Example 1; the refrigerant composition of Example 1 can greatly reduce the degree of wear.

Claims

1. A refrigerant composition suitable for an automotive electric compressor, characterized in that: The refrigerant composition comprises the following raw materials in percentage by mass: 1% to 1.5% of nano silicon dioxide, 0.2% to 1% of polypropylene glycol, 0.5% to 1.0% of zinc dialkyl dithiophosphate, 0.1% to 0.5% of toluene triazole, 0.1% to 0.3% of IRMOF-1, 0.5% to 1% of triethylene glycol, 0.1% to 0.5% of surfactant, and the balance is refrigerant; the structural formula of the IRMOF-1 is Zn4O(BDC)3.

2. A refrigerant composition suitable for an automotive electric compressor according to claim 1, characterized in that: The refrigerant is at least one of refrigerant R134a and refrigerant R1234yf.

3. A refrigerant composition suitable for an automotive electric compressor according to claim 1, characterized in that: The surfactant is at least one of a polyoxyethylene fatty alcohol ether surfactant and a fluorocarbon surfactant.

4. A refrigerant composition suitable for an automotive electric compressor according to claim 1, characterized in that: The polypropylene glycol is PPG2000.

5. A refrigerant composition suitable for an automotive electric compressor according to claim 3, characterized in that: The polyoxyethylene fatty alcohol ether active agent is Tween20.

6. A refrigerant composition suitable for an automotive electric compressor according to claim 1, characterized in that: The median particle size of the IRMOF-1 is 100 μm to 150 μm.

7. A refrigerant composition suitable for an automotive electric compressor according to claim 1, characterized in that: The particle size range of the nano silicon dioxide is below 200 nm.

8. A refrigerant composition suitable for an automotive electric compressor according to claim 1, characterized in that: The method for preparing the refrigerant composition comprises the following steps: S1: Mix nano-silica and IRMOF-1 evenly by airflow to obtain mixed powder A; S2: Add the surfactant to the refrigerant, mix and disperse evenly, then add the mixed powder A to mix and disperse evenly; then add methyl benzotriazole to mix and disperse evenly; finally, add polypropylene glycol, zinc dialkyl dithiophosphate and triethylene glycol in sequence, mix and disperse evenly, and obtain a refrigerant composition.

9. A refrigerant composition suitable for an automotive electric compressor according to claim 8, characterized in that: In S1, the air flow speed of the air flow mixing is 10m / s to 15m / s, and the mixing time is 30min to 45min.

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