A refrigeration oil composition and its preparation method and application

Abstract

The present invention provides a refrigeration oil composition and a preparation method and application thereof. The refrigeration oil composition comprises a refrigeration oil base oil and a fluorine-containing polymer, wherein the fluorine-containing polymer is a mixture of one or both of perfluorononenyl trifluoroethyl ether and hexafluoropropylene dimer. The refrigeration oil composition of the present invention can effectively improve the thermal conductivity of the refrigeration base oil and reduce the viscosity coefficient of the refrigeration base oil. When the refrigeration oil composition of the present invention is applied to an air-conditioning system (especially an automobile air-conditioning system), it can effectively improve the ability of the refrigeration oil to take away heat during operation, and can also effectively reduce the degree of reduction in thermal conductivity when a liquid refrigerant is mixed with a small amount of refrigeration oil, greatly improving the working efficiency of the automobile air-conditioning system and extending the service life of the automobile air-conditioning. In addition, the viscosity coefficient of the refrigeration oil composition is relatively reduced, and the lubrication effect required by the refrigeration oil can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigerator oil for refrigeration system, and in particular relates to a refrigerator oil composition and a preparation method and application thereof. Background Art

[0002] With the progress of the times and the development of science and technology, indoor air conditioners and car air conditioners are widely used, and the main components of the car air conditioning system are evaporators, compressors, condensers, dry filters, etc., and each component is connected by a pipe to form a closed car air conditioning circulation system. When the car air conditioning needs to be cooled, the switch is turned on and the compressor starts working. The compressor sucks in the low-temperature and low-pressure gas refrigerant in the evaporator and compresses it. After that, the compressed gas refrigerant is transported to the condenser through a pipe for cooling. After cooling, the gas refrigerant becomes a low-temperature and high-temperature liquid refrigerant. After that, the liquid refrigerant passes through the expansion valve (throttle valve) in the refrigeration system to cool down and reduce pressure again, and then is transported to the evaporator through a pipe, so that the liquid refrigerant is atomized. After the liquid refrigerant is atomized, it will boil in the evaporator, thereby absorbing the heat in the car and reducing the internal ambient temperature of the car.

[0003] Generally, when a gas refrigerant forms a liquid phase during the compression and cooling process, it will entrain about 7-15wt% of refrigeration oil. The entrained refrigeration oil will adhere to the inner surface of the condenser to form a thicker oil film. Since the thermal conductivity of the oil film is very low, it hinders the heat exchange between the copper substrate and the high-pressure gas refrigerant, resulting in a long conversion time from the gas phase to the liquid phase of the refrigerant. When the liquid refrigerant is transported to the evaporator through a pipeline, the entrained refrigeration oil is mixed with it. Since the thermal conductivity of the refrigeration oil is low, the thermal conductivity of the liquid refrigerant is reduced, which hinders the evaporation refrigeration speed during the endothermic evaporation and atomization process. The temperature of the refrigeration oil rises during the compression and lubrication process, and the thermal conductivity of the refrigeration oil is low, resulting in the inability to extract the heat in time. The temperature rises, the viscosity of the refrigeration oil decreases, the lubrication effect is poor after the lubricating oil film becomes thinner, the friction and wear are more severe when the compressor is running, the compression efficiency of the compressor is low, and the operating life of the compressor is reduced.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a refrigeration oil composition and a preparation method and application thereof, so as to solve the problems of low thermal conductivity and high viscosity of refrigeration oil in current automobile air-conditioning systems.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A refrigeration oil composition comprises a refrigeration oil base oil and a fluorine-containing polymer, wherein the fluorine-containing polymer is one or a mixture of perfluorononenyl trifluoroethyl ether and hexafluoropropylene dimer.

[0008] In an optional embodiment of the present invention, the amount of the fluorine-containing polymer is 1-10% by volume of the refrigerator oil base oil.

[0009] In an optional embodiment of the present invention, the fluorine-containing polymer is a mixture of perfluorononenyl trifluoroethyl ether and hexafluoropropylene dimer, wherein the volume percentage of perfluorononenyl trifluoroethyl ether in the mixture is 10-90%.

[0010] In an optional embodiment of the present invention, the ozone attenuation index of the perfluorononenyl trifluoroethyl ether is 0 and the density is 1.8-1.9 g / cm 3 ;

[0011] The thermal conductivity of the perfluorononenyl trifluoroethyl ether at 25° C. is 0.5-0.6 W / (m·K), and the kinematic viscosity at 25° C. is 3.15-3.25 cst.

[0012] In an optional embodiment of the present invention, the ozone attenuation index of the hexafluoropropylene dimer is 0 and the density is 1.6-1.7 g / cm 3 ;

[0013] The thermal conductivity of the perfluorononenyl trifluoroethyl ether at 25° C. is 0.5-0.6 W / (m·K), and the kinematic viscosity at 25° C. is 0.3-0.4 cst.

[0014] In an optional embodiment of the present invention, the refrigeration oil base oil is a mixture of one or more of polyol ester refrigeration oil, polyolefin glycol refrigeration oil, and polyvinyl ether refrigeration oil.

[0015] The present invention also provides a method for preparing the refrigeration oil composition as described above, the preparation method comprising the following steps:

[0016] Step 1, mixing a refrigeration oil base oil and a fluorine-containing polymer in proportion to obtain a mixture;

[0017] Step 2: heating and stirring the mixture obtained in step 1 to obtain a refrigeration oil composition.

[0018] In an optional embodiment of the present invention, step 2 specifically comprises: placing the mixture in a container, placing the container containing the mixture in a heat-collecting constant-temperature heating magnetic stirrer, heating and stirring in a constant-temperature water bath, and obtaining a refrigeration oil composition.

[0019] In an optional embodiment of the present invention, in step 2, the temperature of the constant temperature water bath is 30-90° C., the speed of heating and stirring is 400-1500 rpm, and the time of heating and stirring is 10-60 min.

[0020] The present invention also provides an application of the refrigeration oil composition as described above, wherein the refrigeration oil composition is applied to an air conditioning system.

[0021] Beneficial effects:

[0022] The refrigerator oil composition of the present invention, by adding a fluorine-containing polymer to the refrigerator oil base oil, the fluorine-containing polymer is a mixture of one or two of perfluorononenyl trifluoroethyl ether and hexafluoropropylene dimer, can effectively improve the thermal conductivity of the refrigerator base oil, reduce the viscosity coefficient of the refrigerator base oil, when the refrigerator oil composition of the present invention is applied to the air-conditioning system (especially the automobile air-conditioning system), can effectively improve the ability of the refrigerator oil to take away the heat in the work, can also effectively reduce the degree of reduction in thermal conductivity when the liquid refrigerant is mixed with a small amount of refrigerator oil, greatly improve the efficiency of the automobile air-conditioning system, extend the service life of the automobile air-conditioning, and the viscosity coefficient of the refrigerator oil composition is relatively reduced, can achieve the lubricating effect required by the refrigerator oil. In short, the refrigerator oil composition of the present invention has good stability, so as to provide the overall operation function of the compressor and improve the refrigeration effect of the automobile air-conditioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0024] Figure 1 The thermal conductivity variation curves of the refrigeration oil compositions obtained in Examples 1 to 10, 15 and 16 of the present invention;

[0025] Figure 2 The thermal conductivity improvement percentage curve of the refrigeration oil composition obtained in Examples 1 to 10, 15 and 16 of the present invention is shown;

[0026] Figure 3 The graphs are the viscosity coefficient variation curves of the refrigeration oil compositions obtained in Examples 1 to 10, 15 and 16 of the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0028] The present invention will be described in detail below in conjunction with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0029] In view of the problem that the refrigeration oil used in the current automobile air conditioning system has low thermal conductivity and high viscosity, the present invention provides a refrigeration oil composition, by adding a fluorine-containing polymer to the refrigeration oil base oil, the fluorine-containing polymer is a mixture of one or two of perfluorononenyl trifluoroethyl ether and hexafluoropropylene dimer, the thermal conductivity of the refrigeration base oil can be effectively improved, and the viscosity coefficient of the refrigeration base oil can be reduced. When the refrigeration oil composition of the present invention is applied to the air conditioning system (especially the automobile air conditioning system), the ability of the refrigeration oil to take away the heat during operation can be effectively improved, and the degree of reduction in thermal conductivity when the liquid refrigerant is mixed with a small amount of refrigeration oil can be effectively reduced, which greatly improves the efficiency of the automobile air conditioning system and extends the service life of the automobile air conditioning. In addition, the viscosity coefficient of the refrigeration oil composition is relatively reduced, and the lubrication effect required by the refrigeration oil can be achieved. In short, the refrigeration oil composition of the present invention has good stability, so that the overall operation function of the compressor can be provided, and the refrigeration effect of the automobile air conditioning can be improved.

[0030] It should be noted that perfluorononenyl trifluoroethyl ether is referred to as DA-328, and its CAS number is 176374-86-0; hexafluoropropylene dimer is referred to as DA-315, and its CAS number is 2070-70-4. Both fluorinated polymers are existing products and are perfluorocarbon liquids, which can be purchased on the market.

[0031] Considering the cost of the refrigeration oil composition, optionally, the amount of the fluorine-containing polymer is 1-10% (such as 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% and the interval between any two end points) of the volume of the refrigeration oil base oil. Adding the fluorine-containing polymer in the above amount range can effectively improve the thermal conductivity of the refrigeration base oil, reduce the viscosity coefficient of the refrigeration base oil, and reduce the cost to a certain extent. It should be noted that the fluorine-containing polymer can be perfluorononenyl trifluoroethyl ether, hexafluoropropylene dimer or a mixture of the two.

[0032] In an optional embodiment of the present invention, the refrigeration oil base oil is a mixture of one or more of polyol ester (POE for short) refrigeration oil, polyolefin glycol (PAG for short) refrigeration oil, and polyethylene ether (PVE for short) refrigeration oil.

[0033] In an optional embodiment of the present invention, the ozone attenuation index of DA-328 is 0 and the density is 1.8-1.9 g / cm 3 (For example, 1.8g / cm 3 , 1.82g / cm 3 , 1.84g / cm 3 , 1.86g / cm 3 、1.88g / cm 3 , 1.9g / cm 3 , and the interval value between any two endpoints).

[0034] The thermal conductivity of DA-328 at 25°C is 0.5-0.6W / (m·K) (for example, 0.5W / (m·K), 0.52W / (m·K), 0.54W / (m·K), 0.56W / (m·K), 0.58W / (m·K), 0.6W / (m·K) and the interval between any two end points), and the kinematic viscosity at 25°C is 3.15-3.25cst (for example, 3.15cst, 3.17cst, 3.19cst, 3.21cst, 3.23cst, ​​3.25cst and the interval between any two end points).

[0035] In an optional embodiment of the present invention, the ozone attenuation index of DA-315 is 0 and the density is 1.6-1.7 g / cm 3 (For example, 1.6g / cm 3 、1.62g / cm 3 , 1.64g / cm 3 , 1.66g / cm 3 、1.68g / cm 3 , 1.7g / cm 3 , and the interval value between any two endpoints).

[0036] The thermal conductivity of DA-315 at 25°C is 0.5-0.6W / (m·K) (for example, 0.5W / (m·K), 0.52W / (m·K), 0.54W / (m·K), 0.56W / (m·K), 0.58W / (m·K), 0.6W / (m·K) and the interval between any two end points), and the kinematic viscosity at 25°C is 0.3-0.4cst (for example, 0.3cst, ​​0.32cst, 0.34cst, 0.36cst, 0.38cst, 0.4cst and the interval between any two end points).

[0037] In an optional embodiment of the present invention, the fluorine-containing polymer is a mixture of perfluorononenyl trifluoroethyl ether and hexafluoropropylene dimer, wherein the volume percentage of perfluorononenyl trifluoroethyl ether in the mixture is 10-90% (for example, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and interval values ​​between any two end points).

[0038] The present invention also provides a method for preparing the refrigeration oil composition as described above, the preparation method comprising the following steps:

[0039] Step 1: Mix the refrigeration oil base oil and the fluorine-containing polymer in proportion to obtain a mixture.

[0040] Specifically, firstly, the refrigerator oil base oil and the fluorine-containing polymer are weighed in proportion, and then added into a beaker in sequence and mixed to obtain a mixture. It should be noted that the fluorine-containing polymer can be perfluorononenyl trifluoroethyl ether, hexafluoropropylene dimer or a mixture of the two.

[0041] Step 2: heating and stirring the mixture obtained in step 1 to obtain a refrigeration oil composition.

[0042] In a specific embodiment of the present invention, step 2 is specifically: placing the mixture in a container (optionally a beaker), and placing the container containing the mixture in a heat-collecting constant temperature heating magnetic stirrer, heating and stirring in a constant temperature water bath to obtain a refrigeration oil composition.

[0043] Optionally, the temperature of the constant temperature water bath is 30-90°C (for example, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C and any interval between the two end points), the speed of heating and stirring is 400-1500rmp (for example, 400rmp, 500rmp, 600rmp, 700rmp, 800rmp, 900rmp, 1000rmp, 1100rmp, 1200rmp, 1300rmp, 1400rmp, 1500rmp and any interval between the two end points), and the time of heating and stirring is 10-60min (for example, 10min, 20min, 30min, 40min, 50min, 60min and any interval between the two end points).

[0044] The present invention also proposes an application of the refrigeration oil composition as described above, wherein the refrigeration oil composition is applied to an air-conditioning system, especially an automobile air-conditioning system.

[0045] After the refrigeration oil composition of the present invention is applied to an air conditioning system (especially an automobile air conditioning system), the ability of the refrigeration oil to remove heat during operation can be effectively improved, and the degree of reduction in thermal conductivity when a liquid refrigerant is mixed with a small amount of refrigeration oil can be effectively reduced, thereby greatly improving the efficiency of the automobile air conditioning system and extending the service life of the automobile air conditioning. In addition, the viscosity coefficient of the refrigeration oil composition is relatively reduced, and the lubrication effect required by the refrigeration oil can be achieved. In short, the refrigeration oil composition can have good stability, thereby providing the overall operation function of the compressor and improving the refrigeration effect of the automobile air conditioning.

[0046] The refrigeration oil composition and the preparation method thereof of the present invention are described in detail below through specific examples.

[0047] In the following examples and comparative examples, DA-328 and DA-315 were purchased from Guangzhou Jinhong Chemical Raw Materials Co., Ltd., where the ozone attenuation index of DA-328 was 0 and the density was 1.806 g / cm 3 DA-328 has a thermal conductivity of 0.52112 W / (m·K) at 25°C and a kinematic viscosity of 3.190 cst at 25°C. DA-315 has an ozone attenuation index of 0 and a density of 1.61 g / cm 3 The thermal conductivity of DA-315 at 25°C is 0.535 W / (m·K), and the kinematic viscosity at 25°C is 0.373 cst.

[0048] Example 1

[0049] This embodiment provides a method for preparing a refrigeration oil composition, and the specific operations are as follows:

[0050] (1) Use a measuring cylinder to measure 20 mL of POE refrigeration oil and slowly pour it into a 100 mL polypropylene beaker.

[0051] (2) Slowly add DA-328 to the beaker in (1). The amount of DA-328 added is 1% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 0.2 mL. It can be seen that there is obvious stratification in the beaker, with the lower layer being DA-328 and the upper layer being POE refrigeration oil.

[0052] (3) The beaker in (2) was placed in a heat-collecting constant temperature heating magnetic stirrer and stirred in a constant temperature water bath at 50°C for 30 min at a stirring speed of 700 rpm. At the initial stage of stirring, a small amount of DA-328 was observed to separate into a small volume and enter the polyol ester (POE) refrigeration oil. After the stirring was completed, the two liquids were observed to be completely dissolved in each other. After complete dissolution, the volumes remained unchanged, indicating that the two liquids were organically miscible. Furthermore, after cooling to room temperature, the liquids did not separate, thus obtaining a refrigeration oil composition with relatively stable performance.

[0053] Example 2

[0054] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 2% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 0.4 mL, and the other operations are the same as in Example 1.

[0055] Example 3

[0056] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 3% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 0.6 mL, and the other operations are the same as Example 1.

[0057] Example 4

[0058] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 4% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 0.8 mL, and the other operations are the same as Example 1.

[0059] Example 5

[0060] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 5% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 1 mL, and the other operations are the same as Example 1.

[0061] Example 6

[0062] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 6% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 1.2 mL, and the other operations are the same as Example 1.

[0063] Example 7

[0064] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 7% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 1.4 mL, and the other operations are the same as Example 1.

[0065] Example 8

[0066] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 8% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 1.6 mL, and the other operations are the same as Example 1.

[0067] Example 9

[0068] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 9% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 1.8 mL, and the other operations are the same as Example 1.

[0069] Example 10

[0070] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 10% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 2 mL, and the other operations are the same as Example 1.

[0071] The refrigeration oil compositions obtained in Examples 1-10 were subjected to performance tests, including thermal conductivity test and viscosity coefficient test. Specifically, 20 mL of each refrigeration oil composition obtained in Examples 1-10 was placed in a thermal conductivity meter and subjected to thermal conductivity test at room temperature and in air atmosphere. The test results are shown in FIG. Figure 1 As shown, the percentage of thermal conductivity improvement of the refrigeration oil composition obtained in each embodiment is sorted out, and the result curve is as follows Figure 2 As shown; 80 mL of each refrigeration oil composition obtained in Examples 1-10 was placed in a kinematic viscosity tester and the viscosity coefficient was tested at room temperature and in an air atmosphere. The test results are shown as follows Figure 3 shown.

[0072] Depend on Figures 1 to 3It can be seen from the performance data that with the increase of the amount of DA-328 in the refrigeration oil composition, the thermal conductivity and the percentage of thermal conductivity improvement of the obtained refrigeration oil composition both increase, and the viscosity coefficient decreases. Specifically, when the amount of DA-328 in the refrigeration oil composition is 10% of the volume of the refrigeration oil base oil, the thermal conductivity and viscosity coefficient of the obtained refrigeration oil composition are 0.1435W / (m·K) and 54.8018cst, respectively. The thermal conductivity is increased by 19.6% and the viscosity coefficient is reduced by 16.3% on the basis of POE base oil. The increase in thermal conductivity can improve the internal heat dissipation efficiency of the automobile air-conditioning system, reduce the conversion time from the gas phase to the liquid phase of the refrigerant, and increase the evaporation refrigeration rate during the refrigerant endothermic evaporation and atomization process. The reduction in the viscosity coefficient can achieve the lubricating effect required by the refrigeration oil. The refrigeration oil composition can improve the overall operating function of the compressor and improve the refrigeration effect of the automobile air-conditioning system.

[0073] Embodiment 11

[0074] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Embodiment 1 only in that, in step 3, the temperature of the constant temperature water bath is 30° C., the stirring time is 60 min, the stirring speed is 400 rpm, and other operations are the same as those in Embodiment 1.

[0075] After testing, the thermal conductivity and viscosity coefficient of the refrigeration oil composition obtained in this embodiment are 0.1429 W / (m·K) and 55.4076 cst, respectively. The thermal conductivity is increased by 19.08% and the viscosity coefficient is reduced by 15.41% on the basis of the POE base oil.

[0076] Example 12

[0077] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Embodiment 1 only in that, in step 3, the temperature of the constant temperature water bath is 90° C., the stirring time is 10 min, the stirring speed is 1500 rpm, and other operations are the same as those in Embodiment 1.

[0078] After testing, the thermal conductivity and viscosity coefficient of the refrigeration oil composition obtained in this embodiment are 0.1442 W / (m·K) and 54.1307 cst, respectively. The thermal conductivity is increased by 20.16% and the viscosity coefficient is reduced by 17.36% on the basis of the POE base oil.

[0079] Example 13

[0080] This embodiment provides a method for preparing a refrigeration oil composition. The only difference from Embodiment 1 is that PAG refrigeration oil is used as the refrigeration oil, and other operations are the same as those in Embodiment 1.

[0081] After testing, the thermal conductivity and viscosity coefficient of the refrigeration oil composition obtained in this embodiment are 0.15921 W / (m·K) and 72.5390 cst, respectively. The thermal conductivity is increased by 8.02% and the viscosity coefficient is reduced by 14.66% on the basis of the PAG base oil.

[0082] Embodiment 14

[0083] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Embodiment 1 only in that PVE refrigeration oil is used as the refrigeration oil, and other operations are the same as those in Embodiment 1.

[0084] After testing, the thermal conductivity and viscosity coefficient of the refrigeration oil composition obtained in this embodiment are 0.1489 W / (m·K) and 72.8448 cst, respectively. The thermal conductivity is increased by 8.88% and the viscosity coefficient is reduced by 13.28% on the basis of the PVE base oil.

[0085] Embodiment 15

[0086] This embodiment provides a method for preparing a refrigeration oil composition, and the specific operations are as follows:

[0087] (1) Use a measuring cylinder to measure 20 mL of POE refrigeration oil and slowly pour it into a 100 mL polypropylene beaker.

[0088] (2) Slowly add DA-315 to the beaker in step (1). The amount of DA-315 added is 1% of the volume of the POE refrigeration oil, that is, the amount of DA-315 added is 0.2 mL. It can be seen that the two solutions in the beaker are dissolved in each other.

[0089] (3) The beaker in (2) was placed on a magnetic stirrer. After stirring, the two liquids were observed to be completely dissolved in each other. After complete dissolution, the volumes remained unchanged, indicating that the two liquids were organically miscible. After cooling to room temperature, the liquids did not separate, thus obtaining another refrigeration oil composition with relatively stable performance.

[0090] (4) Changing the amount of DA-315 added in step (2) to set up multiple control groups, wherein the amount of DA-315 added in the multiple control groups is 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, and 10% of the volume of the POE refrigeration oil, and then repeating the operation of step (3) to obtain multiple groups of refrigeration oil compositions with different ratios.

[0091] The above-mentioned multiple groups of refrigeration oil compositions with different ratios were tested for thermal conductivity, thermal conductivity improvement percentage and viscosity coefficient according to the above-mentioned test method. The test results are as follows: Figure 1 , Figure 2 and Figure 3 shown.

[0092] Depend on Figures 1 to 3 It can be seen from the performance data that with the increase in the amount of DA-315 in the refrigeration oil composition, the thermal conductivity and the percentage of thermal conductivity improvement of the obtained refrigeration oil composition both increase, and the viscosity coefficient decreases. Specifically, when only DA-315 is added to the refrigeration oil composition and the amount is 10% of the volume of the refrigeration oil base oil, the thermal conductivity increases from 0.12W / (m·K) to 0.14146W / (m·K), and the increase percentage is 17.88%; the viscosity coefficient decreases from 65.5cst to 51.895cst, a decrease of 20.8%. The increase in thermal conductivity can improve the internal heat dissipation efficiency of the automobile air-conditioning system, reduce the conversion time from the gas phase to the liquid phase of the refrigerant, and increase the evaporation refrigeration rate during the refrigerant endothermic evaporation atomization process. The reduction in the viscosity coefficient can achieve the lubricating effect required by the refrigeration oil. The refrigeration oil composition can improve the overall operating function of the compressor and improve the refrigeration effect of the automobile air-conditioning system.

[0093] Example 16

[0094] This embodiment provides a method for preparing a refrigeration oil composition, and the specific operations are as follows:

[0095] (1) Use a measuring cylinder to measure 20 mL of POE refrigeration oil and slowly pour it into a 100 mL polypropylene beaker.

[0096] (2) DA-328 and DA-315 were slowly added to the beaker in step (1), respectively. The volume proportion of DA-328 was 50%, that is, DA-328 and DA-315 were added to the beaker at a volume ratio of 1:1. The amount of the mixture added was 1% of the volume of the POE refrigeration oil. Specifically, the amount of DA-328 added was 0.1 mL, and the amount of DA-315 added was 0.1 ml. It can be seen that obvious stratification occurred in the beaker.

[0097] (3) The beaker in (2) was placed on a heat-collecting magnetic stirrer. After stirring, the three liquids were observed to be completely dissolved in each other. After complete dissolution, the volumes remained unchanged, indicating that the liquids were organically miscible. After cooling to room temperature, the liquids did not separate, thus obtaining another refrigeration oil composition with relatively stable performance.

[0098] (4) Changing the amount of the mixture added in step (2) to set up multiple control groups, wherein the amount of the mixture added in the multiple control groups is 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, and 10% of the volume of the POE refrigeration oil, and then repeating the operation of step (3) to obtain multiple groups of refrigeration oil compositions with different ratios.

[0099] The above-mentioned multiple groups of refrigeration oil compositions with different ratios were tested for thermal conductivity, thermal conductivity improvement percentage and viscosity coefficient according to the above-mentioned test method. The test results are as follows: Figure 1 , Figure 2 and Figure 3 shown.

[0100] Depend on Figures 1 to 3 It can be seen from the performance data that with the increase in the amount of the two mixed in the refrigeration oil composition, the thermal conductivity and the percentage of thermal conductivity improvement of the obtained refrigeration oil composition both increase, and the viscosity coefficient decreases. Specifically, when a mixture of DA-328 and DA-315 is added to the refrigeration oil composition and the amount of the mixture is 10% of the volume of the refrigeration oil base oil, the thermal conductivity increases from 0.12W / (m·K) to 0.14235W / (m·K), and the increase percentage is 18.625%; the viscosity coefficient decreases from 65.5cst to 53.335cst, a decrease of 18.6%. The increase in thermal conductivity can improve the internal heat dissipation efficiency of the automobile air-conditioning system, reduce the conversion time from the gas phase to the liquid phase of the refrigerant, and increase the evaporation refrigeration rate during the refrigerant endothermic evaporation atomization process. The reduction in the viscosity coefficient can achieve the lubrication effect required by the refrigeration oil. The refrigeration oil composition can improve the overall operating function of the compressor and improve the refrigeration effect of the automobile air-conditioning system.

[0101] Based on the above performance data comparison, the refrigeration oil composition with only DA-328 added has better properties, with the largest improvement in thermal conductivity, which is beneficial for quickly removing heat from the air-conditioning system during use, while the viscosity coefficient is reduced, which can both establish an oil film and not easily increase the wear of system parts.

[0102] Embodiment 17

[0103] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 16 only in that the volume proportion of DA-328 is 10%, and other operations are the same as Example 16.

[0104] After testing, the thermal conductivity and viscosity coefficient of the refrigeration oil composition obtained in this embodiment are 0.14126W / (m·K) and 52.18081cst, respectively. The thermal conductivity is increased by 18.02% and the viscosity coefficient is reduced by 20.33% on the basis of the POE base oil.

[0105] Embodiment 18

[0106] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 16 only in that the volume proportion of DA-328 is 90%, and other operations are the same as Example 16.

[0107] After testing, the thermal conductivity and viscosity coefficient of the refrigeration oil composition obtained in this embodiment are 0.14325 W / (m·K) and 54.50634 cst, respectively. The thermal conductivity is increased by 19.375% and the viscosity coefficient is reduced by 16.78% on the basis of POE base oil.

[0108] Comparative Example 1

[0109] The difference between this comparative example and Example 1 is that this comparative example uses pure POE refrigeration oil without adding DA-328.

[0110] After testing, the viscosity coefficient of pure POE refrigeration oil is 65.5cst and the thermal conductivity is 0.1200W (m·K).

[0111] Comparative Example 2

[0112] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 0.5% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 0.1 mL, and the other operations are the same as in Example 1.

[0113] When DA-328 is added in an amount of 0.5% by volume of the refrigeration oil, the thermal conductivity and viscosity coefficient of the refrigeration oil composition are 0.12101W / (m·K) and 64.88136cst, respectively. The thermal conductivity is increased by 0.84% ​​on the basis of POE. The rate of increase in thermal conductivity is relatively small, and the effect of improving the overall performance of the refrigeration oil composition is not obvious.

[0114] Comparative Example 3

[0115] This embodiment provides a method for preparing a refrigeration oil composition, which is different from Example 1 only in that in step (2), the amount of DA-328 added is 15% of the volume of the POE refrigeration oil, that is, the amount of DA-328 added is 3 mL, and the other operations are the same as Example 1.

[0116] When the amount of DA-328 added is 15% of the volume of the refrigeration oil, the thermal conductivity and viscosity coefficient of the refrigeration oil composition are 0.1564W / (m·K) and 52.435997cst, respectively. The thermal conductivity is increased by 30.33% and the viscosity is reduced by 19.945% on the basis of POE. Compared with the performance data of Example 1, the thermal conductivity is improved at a higher rate, and the heat dissipation efficiency inside the automobile air conditioning system is higher, but the viscosity coefficient is reduced more. If the viscosity is too small, it is difficult to establish the required oil film and accelerate the wear of the bearings and the like.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A refrigeration oil composition, characterized in that: The refrigeration oil composition comprises a refrigeration oil base oil and a fluorine-containing compound; The amount of the fluorine-containing compound is 1-10% by volume of the refrigerator oil base oil; The fluorine-containing compound is a mixture of perfluorononenyl trifluoroethyl ether and hexafluoropropylene dimer, wherein the volume percentage of perfluorononenyl trifluoroethyl ether in the mixture is 10-90%.

2. The refrigerating machine oil composition according to claim 1, characterized in that The ozone attenuation index of the perfluorononenyl trifluoroethyl ether is 0 and the density is 1.8-1.9 g / cm 3 ; The thermal conductivity of the perfluorononenyl trifluoroethyl ether at 25° C. is 0.5-0.6 W / (m·K), and the kinematic viscosity at 25° C. is 3.15-3.25 cst.

3. The refrigerating machine oil composition according to claim 1, characterized in that The ozone attenuation index of the hexafluoropropylene dimer is 0, and the density is 1.6-1.7 g / cm 3 ; The thermal conductivity of the hexafluoropropylene dimer at 25° C. is 0.5-0.6 W / (m·K), and the kinematic viscosity at 25° C. is 0.3-0.4 cst.

4. The refrigerating machine oil composition according to claim 1, characterized in that The refrigeration oil base oil is a mixture of one or more of polyol ester refrigeration oil, polyolefin glycol refrigeration oil and polyvinyl ether refrigeration oil.

5. A method for preparing a refrigeration oil composition according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: Step 1, mixing a refrigeration oil base oil and a fluorine-containing compound in proportion to obtain a mixture; Step 2: heating and stirring the mixture obtained in step 1 to obtain a refrigeration oil composition.

6. The method for preparing a refrigeration oil composition according to claim 5, characterized in that: The second step is specifically as follows: placing the mixture in a container, and placing the container containing the mixture in a heat-collecting constant-temperature heating magnetic stirrer, heating and stirring in a constant-temperature water bath to obtain a refrigeration oil composition.

7. The method for preparing a refrigeration oil composition according to claim 6, wherein: In step 2, the temperature of the constant temperature water bath is 30-90° C., the speed of heating and stirring is 400-1500 rpm, and the time of heating and stirring is 10-60 min.

8. Use of a refrigeration oil composition as claimed in any one of claims 1 to 4, characterized in that: The refrigerating machine oil composition is applied to an air conditioning system.

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