Cooling liquid as well as preparation method and application thereof

Abstract

The invention discloses a cooling liquid, which is prepared from the following ingredients in percentage by mass: 89 to 98 percent of low-viscosity poly-alpha olefin, 1 to 8 percent of high-viscosity poly-alpha olefin, 0.01 to 0.5 percent of modified nanometer insulating heat-conducting fluid, 0.2 to 2.5 percent of alkyl naphthalene, 0.01 to 0.5 percent of antioxidants and 0.03 to 0.06 percent of anti-foaming agents. The preparation method of the modified nano insulating heat-conducting fluid comprises the following steps: S1, uniformly stirring the polyisobutylene succinimide dispersing agent, the sulfurized alkylphenate and the antioxidant to obtain a mixture; and S2, adding nano solid particles into the mixture, and carrying out ultrasonic dispersion. According to the cooling liquid and the preparation method and application thereof, the modified nano insulating heat-conducting fluid, the antioxidant, the anti-foaming agent and the like are added into the poly-alpha-olefin, so that the immersed cooling liquid which is good in stability and capable of prolonging the service life and improving the heat transfer and heat conduction performance is formed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid cooling of electronic components, and particularly relates to a cooling liquid and a preparation method and application thereof. BACKGROUND

[0002] Electronic components are the core components of modern electronic devices, and the stability and reliability of their performance are directly related to the operating efficiency and safety of the entire system. With the rapid development of information technology, especially the continuous rise in power consumption of high-performance electronic components such as CPUs, GPUs, and optical modules, the heat dissipation problem has become a key factor restricting the performance of these components. Traditional air cooling and water cooling methods have been difficult to meet the growing demand for heat dissipation when facing high-power electronic components, and their low heat dissipation efficiency and tendency to cause local overheating of components affect the service life and operating stability of the equipment.

[0003] In particular, in lithium-ion battery energy storage systems, a large amount of heat generated during rapid charging and discharging cannot be effectively dissipated in time, which not only leads to a decrease in battery performance, but also may cause safety problems such as battery thermal runaway.

[0004] To address the above problems, immersion cooling technology has attracted much attention due to its high heat dissipation performance.

[0005] Currently used immersion cooling liquids are mainly divided into single-phase immersion cooling liquids and phase-change immersion cooling liquids according to whether phase change occurs during cooling. Single-phase immersion cooling liquids usually use high-boiling-point insulating oils such as silicone oil, mineral oil, and vegetable oil. These insulating oils have high viscosity, and a large amount of energy is consumed when circulating the insulating oil through a mechanical pump, which is not conducive to improving the heat dissipation performance. In addition, silicone oil is difficult to biodegrade, has environmental problems, and can corrode metals such as copper and iron, affecting the performance of electronic components, has a gel catalytic effect on them, must be replaced regularly, and has a short service life. Mineral oils such as white oil and transformer oil contain sulfur and aromatic cyclic hydrocarbons, which can corrode metals such as copper, affect the performance of electronic components, must be replaced regularly, have a short service life, and are toxic. Phase-change immersion cooling liquids mostly use low-boiling-point fluorinated liquids, but they have high costs, and when the heat flux density of the cooling liquid reaches the value corresponding to the transition from nucleate boiling to transition boiling, there are many bubbles on the surface of the electronic components (such as lithium-ion batteries), so that many bubbles are connected to cover part of the heating surface. At this time, due to the low heat transfer coefficient of the gas film, the temperature of the heating surface rises quickly, leading to safety problems of lithium-ion batteries due to severe heat accumulation. In addition, fluorinated liquids are not biodegradable, have serious environmental problems, are corrosive to certain metals, and have high global warming potential (GWP), which exacerbates environmental problems. These factors limit their popularization in practical applications.

[0006] Therefore, how to provide a low viscosity, good thermal conductivity, low cost and high stability immersion cooling liquid for lithium ion battery becomes a problem to be solved. SUMMARY

[0007] In view of the problems of high viscosity, poor thermal conductivity, high cost, poor stability, environmental protection and short service life of the prior art immersion cooling liquid, the present application provides a cooling liquid, a preparation method and application thereof, by adding modified nano insulating thermal conductive fluid, antioxidant, antifoaming agent and the like in poly-alpha-olefin, to form an immersion cooling liquid with good stability, which can increase service life and improve heat transfer and thermal conductivity.

[0008] To achieve the above object, the embodiments of the present application adopt the following technical solutions: A cooling liquid, each component of the cooling liquid has the following mass percentage: 89-98% of low viscosity poly-alpha-olefin, 1-8% of high viscosity poly-alpha-olefin, 0.01-0.5% of modified nano insulating thermal conductive fluid, 0.2-2.5% of alkyl naphthalene, 0.01-0.5% of antioxidant and 0.03-0.06% of antifoaming agent, the preparation method of the modified nano insulating thermal conductive fluid comprises the following steps: S1: uniformly stirring polyisobutylene succinimide dispersant, sulfided alkyl phenate and antioxidant to obtain a mixture; S2: adding nano solid particles in the mixture and ultrasonic dispersing, to obtain the modified nano insulating thermal conductive fluid.

[0009] According to an aspect of the present application, the step S1 comprises: stirring 70-95% of polyisobutylene succinimide dispersant, 1.5-15% of sulfided alkyl phenate and 0.01-3.5% of antioxidant at 20-30℃ and 245-255r / min for 40-60min, to obtain a mixture.

[0010] According to an aspect of the present application, the step S2 comprises: adding 1.5-15% of nano solid particles in the mixture and ultrasonic dispersing at 40-65℃ for 55-65min, to obtain the modified nano insulating thermal conductive fluid.

[0011] According to an aspect of the present application, the polyisobutylene succinimide dispersant is one or a combination of boronized polyisobutylene succinimide, polyisobutylene succinimide and boronized polyisobutylene bisuccinimide.

[0012] According to an aspect of the present application, the nano solid particles are one or more of nano silicon nitride, nano silicon carbide, diamond, graphene oxide and / or fluorinated graphene.

[0013] According to one aspect of the present application, the sulfidized alkyl phenate is sulfidized calcium alkyl phenate or sulfidized barium alkyl phenate.

[0014] According to one aspect of the present application, the alkyl naphthalene is a substituted product obtained by the Friedel-Crafts alkylation reaction of C12-C24 linear alpha olefin and naphthalene, the kinematic viscosity of the alkyl naphthalene at 100℃ is 5-12 cst, preferably 5-12 cst, and the flash point is not less than 230℃.

[0015] According to one aspect of the present application, the low viscosity poly-alpha-olefin is poly-alpha-olefin cPAO obtained by non-metallocene catalyzed polymerization and / or metallocene poly-alpha-olefin mPAO obtained by metallocene catalyzed polymerization, the kinematic viscosity of the low viscosity poly-alpha-olefin at 100℃ is 1.5-10 cst, and the kinematic viscosity of the high viscosity poly-alpha-olefin at 100℃ is 40-1000 cst.

[0016] According to one aspect of the present application, the high viscosity poly-alpha-olefin is metallocene poly-alpha-olefin mPAO obtained by metallocene catalyzed polymerization, and the high viscosity poly-alpha-olefin includes one or a combination of mPAO40, mPAO65, mPAO100, mPAO150, mPAO300 and / or mPAO1000.

[0017] According to one aspect of the present application, the antioxidant is one or more of liquid octyl butyl diphenylamine, tertiary butyl p-cresol and / or triethanolamine, and the antifoaming agent is one or more of PC1244, Foamaster 155 and / or MUNZING149.

[0018] According to one aspect of the present application, the preparation method of the cooling liquid includes: configuring the required components, and heating and mixing the components to obtain the cooling liquid.

[0019] According to one aspect of the present application, the heating and mixing of the components includes heating the reaction kettle to 40-70℃, and then adding the ultra-low viscosity poly-alpha-olefin, the ultra-high viscosity poly-alpha-olefin, the modified nano-insulating thermal conductive fluid, the alkyl naphthalene, the antioxidant, the antifoaming agent, the dispersant and the like into the reaction kettle in the order of the feeding proportion, and stirring at a speed of 200-350 rpm / min for 50-60 min.

[0020] According to one aspect of the present application, the cooling liquid is applied to electronic components.

[0021] The advantages of the present application are: (1) The polyisobutylene succinimide dispersant and vulcanized alkyl phenate are effectively compounded with nano solid particles to form a modified nano insulating and heat conducting fluid, which has obvious increase in the anti-friction performance and anti-corrosion performance of the cooling liquid and improves the uniform dispersion effect of the nano solid particles.

[0022] (2) The low viscosity poly-alpha olefin is used as the base oil, which has lower kinematic viscosity, maximum specific heat capacity, smaller dielectric constant, excellent oxidation stability, longer service life and is harmless to the environment and biodegradable compared with the mineral oil.

[0023] (3) The additive solubility of the poly-alpha olefin is greatly improved by adding alkyl naphthalene, the cooling liquid can not precipitate the additive for a long time at low temperature and keep stable performance. Meanwhile, the alkyl naphthalene can produce a synergistic effect with the antioxidant to increase the service life. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application are described clearly and completely, obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0025] A low viscosity immersion cooling liquid, the mass percentage of each component of the cooling liquid is as follows: low viscosity poly-alpha olefin 89% to 98%, high viscosity poly-alpha olefin 1% to 8%, modified nano insulating and heat conducting fluid 0.01% to 0.5%, alkyl naphthalene 0.2% to 2.5%, antioxidant 0.01% to 0.5%, antifoaming agent 0.03% to 0.06%, the preparation method of the modified nano insulating and heat conducting fluid comprises the following steps: S1: stirring the polyisobutylene succinimide dispersant, vulcanized alkyl phenate and antioxidant to obtain a mixture; S2: adding nano solid particles to the mixture and ultrasonic dispersion, to obtain the modified nano insulating and heat conducting fluid.

[0026] In practical application, the polyisobutylene succinimide dispersant is one or more combinations of boronized polyisobutylene succinimide, polyisobutylene succinimide and boronized polyisobutylene bisuccinimide. Preferably, boronized polyisobutylene succinimide is selected.

[0027] In practical application, the vulcanized alkyl phenate can use vulcanized calcium alkyl phenate or vulcanized barium alkyl phenate, preferably vulcanized calcium dodecyl phenate.

[0028] In practical applications, the nano solid particles have a high insulating thermal conductivity, and one or more of nano silicon nitride, nano silicon carbide, diamond, graphene oxide and / or fluorinated graphene can be selected. The modified nano insulating thermal conductive fluid has a large thermal conductivity, which can improve the heat transfer and thermal conductivity of the low-viscosity immersion cooling liquid.

[0029] In practical applications, the antioxidant can be, but is not limited to, naphthylamine, diphenylamine, p-phenylenediamine, 2-octyldiphenylamine, 4-tert-butyl-N-phenyl aniline, 4,4'-dioctyldiphenylamine, m-toluenediamine, 4-tert-butyl diphenylamine, octyl butyl diphenylamine, etc.

[0030] In practical applications, the step S1 includes: stirring 70-95% of polyisobutylene succinimide dispersant, 1.5-15% of sulfided alkyl phenate and 0.01-3.5% of antioxidant at a speed of 245-255 r / min for 40-60 min at 20-30°C to obtain a mixture. The step S2 includes: adding 1.5-15% of nano solid particles to the mixture and ultrasonic dispersing at 40-65°C for 55-65 min to obtain the modified nano insulating thermal conductive fluid.

[0031] In practical applications, the antioxidant is one or more of liquid octyl butyl diphenylamine, tert-butyl p-cresol and / or triethanolamine. The addition of the antioxidant can prevent the oxidation of the low-viscosity immersion cooling liquid, and the alkyl naphthalene can produce a synergistic effect with the antioxidant to increase the service life. The antifoaming agent is a conventional antifoaming agent in the art, such as one or more of Zhanxin PC1244, BASF Foamaster 155 and / or German Mingling MUNZING149, and the addition amount is 0.03%-0.06% of the total mass of the composition. The addition of the antifoaming agent can reduce the generation of bubbles at the contact interface between the cooling liquid and the lithium ion battery pack, and avoid damage to the heat transfer at the interface due to the generation of bubbles.

[0032] Further, the cooling liquid further includes 0.03%-0.5% of a dispersant. The addition of the dispersant can enhance the dispersibility of the modified nano insulating thermal conductive fluid in the cooling liquid and effectively improve the sedimentation of the nano solid particles in the modified nano insulating thermal conductive fluid. Specifically, the dispersant can be one or more combinations of polyisobutylene succinimide, boronized polyisobutylene succinimide and / or boronized polyisobutylene bisuccinimide.

[0033] In practical applications, the alkyl naphthalene is a substituted product obtained by the Friedel-Crafts alkylation reaction of C12-C24 straight-chain alpha olefins with naphthalene, belongs to V-class base oil, and has excellent thermal oxidation stability, thermal stability and hydrolysis stability, as well as excellent dissolving and dispersing capacity. Specifically, the alkyl naphthalene has a 100℃ kinematic viscosity of 5-12 cst and a flash point not lower than 230℃. In practical applications, alkyl naphthalene AN5 can be selected.

[0034] In practical applications, the low-viscosity poly-alpha-olefin is a poly-alpha-olefin cPAO obtained by non-metallocene catalytic polymerization and / or a metallocene poly-alpha-olefin mPAO obtained by metallocene catalytic polymerization and hydrogenation and distillation, the low-viscosity poly-alpha-olefin has a 100℃ kinematic viscosity of 1.5-10 cst and a pour point not higher than -57℃. Specifically, the poly-alpha-olefin cPAO obtained by non-metallocene catalytic polymerization is one or a combination of PAO1.5, PAO2, PAO4 and / or PAO10, and is preferably PAO1.5. The metallocene poly-alpha-olefin mPAO is one or a combination of mPAO3.5, mPAO6, mPAO8 and / or mPAO10, the metallocene poly-alpha-olefin mPAO has a more consistent comb structure, a relatively narrow molecular weight distribution, and no upright side chain, thereby better providing shear stability and a lower pour point. The metallocene poly-alpha-olefin mPAO is preferably mPAO3.5.

[0035] In practical applications, the high-viscosity poly-alpha-olefin is a poly-alpha-olefin mPAO obtained by metallocene catalytic polymerization and hydrogenation and distillation, the high-viscosity poly-alpha-olefin has a 100℃ kinematic viscosity of 40-1000 cst. The high-viscosity poly-alpha-olefin includes one or a combination of mPAO40, mPAO65, mPAO100, mPAO150, mPAO300 and / or mPAO1000. The high-viscosity poly-alpha-olefin is preferably mPAO40.

[0036] In practical applications, the cooling liquid uses low-viscosity poly-alpha-olefin as base oil, and compared with silicon oil used as base oil, the low-viscosity poly-alpha-olefin cooling liquid has lower kinematic viscosity and better heat conduction performance. By adding functional additives such as antioxidants and antifoaming agents to the low-viscosity poly-alpha-olefin, the stability and uniformity of the low-viscosity poly-alpha-olefin immersion cooling liquid can be improved, and the service life of the immersion cooling liquid can be prolonged. The addition of modified nano-insulating heat-conducting fluid can not only ensure the insulation performance of the immersion cooling liquid, but also facilitate the contact between the immersion cooling liquid and electronic components for liquid cooling, especially for liquid cooling of lithium ion batteries. Moreover, the addition of the modified nano-insulating heat-conducting fluid can greatly improve the heat transfer and heat conduction performance of the immersion cooling liquid.

[0037] In practical application, the preparation method of the cooling liquid comprises the following steps: after the reactor is warmed to 40-70°C, the low-viscosity poly-alpha-olefin, the high-viscosity poly-alpha-olefin, the modified nano-insulating thermal conductive fluid, the alkyl naphthalene, the antioxidant, the antifoaming agent and the like are sequentially added into the reactor according to the feeding ratio, and stirring is performed at a speed of 200-350 rpm / min for 50-60 min. Through stirring and ultrasonic operation, the dispersion uniformity of the antioxidant, the antifoaming agent and the dispersant in the low-viscosity poly-alpha-olefin cooling liquid can be effectively improved, so that the cooling uniformity of the immersion cooling liquid can be improved.

[0038] In practical application, the cooling liquid can be applied in electronic components and devices, such as lithium ion batteries, resistors, capacitors, inductors, liquid crystal screens, semiconductor separation devices, electroacoustic devices, laser devices, optoelectronic devices, sensors, power supplies, integrated circuits, CPUs, GPUs, printed circuit boards and the like. Specifically, when applied in a lithium ion battery, the liquid cooling system can be integrated with a battery pack of the lithium ion battery, contacts the battery pack or multiple battery modules through a large flow of immersion cooling liquid, and performs heat dissipation on the battery pack or redistributes the heat among the battery modules, so as to improve the safety of the lithium ion battery and increase the service life of the lithium ion battery.

[0039] The advantages of the present application are further illustrated by more specific examples, but the protection scope of the present application is not limited to the following examples.

[0040] Preparation Example 1 The preparation method of the modified nano-insulating thermal conductive fluid comprises the following steps: S1: 70-95% of boronized polyisobutylene bis succinimide, 1.5-15% of sulfided alkyl phenate and 0.01-3.5% of antioxidant are stirred at a speed of 245-255 rpm / min for 40-60 min to obtain a mixture. S2: 1.5-15% of nano solid particles are added into the mixture, and ultrasonic dispersion is performed at 40-65°C for 55-65 min, so as to obtain the modified nano-insulating thermal conductive fluid.

[0041] Table 1 shows the formulations of Examples 1-6 and Comparative Examples 1-3 of the cooling liquid of the present application, wherein the modified nano-insulating thermal conductive fluid is prepared by Preparation Example 1, and the remaining raw materials can be obtained by commercial form, and in order to keep the reliability of the experiment, the raw materials used in the following examples and comparative examples all have the same physical and chemical parameters or are prepared by the same treatment method.

[0042] Each cooling liquid is obtained by mixing each component and its content given in Table 1 uniformly. Specifically, after mixing the ultra-low viscosity poly-alpha-olefin, the reaction kettle is heated to 40-70℃, then the ultra-high viscosity poly-alpha-olefin mPAO40, modified nano-insulating thermal conductive fluid, antioxidant, antifoaming agent, etc. are added into the reaction kettle according to the feeding ratio, and stirred at a speed of 200-350 rpm / min for 50-60 min. After mixing, the material in the reaction kettle is transferred to a storage tank for standing for more than 60 min, and each cooling liquid is obtained.

[0043] Table 1

[0044] Performance test: The poly-alpha-olefin immersion cooling liquid prepared in Examples 1-6 and Comparative Examples 1-3 is subjected to performance detection, and the specific performance detection method is as follows: density test according to GB / T1884 “Laboratory determination of density of crude petroleum and liquid petroleum products”; ignition point performance test according to GB / T21791 “Determination of self-ignition temperature of petroleum products”; kinematic viscosity test according to GB / T265 “Determination of kinematic viscosity and dynamic viscosity of petroleum products”; flash point test according to GB / T3536 “Determination of flash and fire points of petroleum products - Cleveland open cup method”; dielectric constant test according to GB / T5654 “Measurement of relative permittivity, dielectric loss factor and direct current resistivity of liquid insulating materials”; pour point test according to GB / T3535 “Determination of pour point of petroleum products”; water solubility test according to GB / T7600 “Determination of water content in operating transformer and turbine oils (Coulometric method)”; rotating bomb test according to SH / T0193 “Determination of oxidation stability of lubricating oils - rotating bomb method”.

[0045] At the same time, the performance parameters of the existing immersion fluorinated liquid product with a model of 3M™ Fluorinert™ Electronic Liquid FC-40 and the immersion modified silicone oil product with a model of DOWSIL™ ICL-1000 Fluid are measured by using the above detection methods. The specific test results are shown in Table 2.

[0046] Table 2

[0047] From Table 2, it can be seen that: 1) the kinematic viscosity of the poly-alpha-olefin immersion cooling liquid prepared in Examples 1-6 is significantly lower than that of the modified silicone oil product, and slightly higher than that of the fluorinated liquid product, and at the same time, the specific heat capacity of the poly-alpha-olefin immersion cooling liquid prepared in Examples 1-6 is significantly higher than that of the fluorinated liquid product, so it can be seen that the heat storage performance of the immersion cooling liquid with modified nano-insulating thermal conductive fluid is significantly increased, and the viscosity is reduced compared with the modified silicone oil product.

[0048] (2) After adding the antioxidant and the antifoaming agent, the flash point is improved, and the thermal stability of the low-viscosity poly-alpha-olefin is greatly improved, so that the low-viscosity poly-alpha-olefin can be stably operated for a long time.

[0049] (3) Since the selected modified nano-insulating thermal conductive fluid is not conductive, the cooling liquid still has good insulation after the modified nano-insulating thermal conductive fluid is added.

[0050] (4) The alkyl naphthalene can produce a synergistic effect with the antioxidant, and according to the rotary oxygen bomb data, the addition of the alkyl naphthalene and the antioxidant at the same time greatly increases the oxidation resistance of the cooling liquid and increases the service life. Meanwhile, the addition of the two at the same time improves the flash point of the cooling liquid and increases the use temperature of the cooling liquid.

[0051] (5) The thermal storage performance, oxidation resistance, flash point and service life of the cooling liquid with the modified nano-insulating thermal conductive fluid are obviously better than those of the cooling liquid with the ordinary nano-solid particles.

[0052] The advantages of the embodiment of the present application are: (1) the polyisobutylene succinimide dispersant, the vulcanized alkyl phenolate and the nano-solid particles are effectively compounded to form the modified nano-insulating thermal conductive fluid, which has the advantages of obviously increasing the anti-friction performance and the anti-corrosion performance of the cooling liquid and improving the uniform dispersion effect of the nano-solid particles.

[0053] (2) The low-viscosity poly-alpha-olefin is used as the base oil, and compared with the silicon oil and the mineral oil, the low-viscosity poly-alpha-olefin has lower kinematic viscosity, maximum specific heat capacity, smaller dielectric constant, excellent oxidation stability, longer service life, no harm to the environment and the human body and can be biodegraded.

[0054] (3) The addition of the alkyl naphthalene greatly improves the additive solubility of the poly-alpha-olefin, the cooling liquid can not precipitate the additive for a long time at low temperature, and the performance is stable. Meanwhile, the alkyl naphthalene can produce a synergistic effect with the antioxidant to increase the service life.

[0055] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, and should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A coolant, characterized in that, The coolant comprises the following components by mass percentage: low-viscosity polyalphaolefin 89%–98%, high-viscosity polyalphaolefin 1%–8%, modified nano-insulating thermally conductive fluid 0.01%–0.5%, alkyl naphthalene 0.2%–2.5%, antioxidant 0.01%–0.5%, and antifoaming agent 0.03%–0.06%. The preparation method of the modified nano-insulating thermally conductive fluid includes the following steps: S1: Mix polyisobutylene succinimide dispersant, sulfurized alkylphenol salt and antioxidant to obtain a uniform mixture; S2: Add nano solid particles to the mixture and disperse them by ultrasonication to obtain the modified nano insulating thermally conductive fluid.

2. The coolant according to claim 1, characterized in that, The polyisobutylene succinimide dispersant is one or more combinations of boronized polyisobutylene succinimide, polyisobutylene succinimide, and boronized polyisobutylene bis(succinimide).

3. The coolant according to claim 2, characterized in that, The nanoparticles are one or more of nano-silicon tetranitride, nano-silicon carbide, diamond, graphene oxide, and / or fluorinated graphene.

4. The coolant according to claim 1, characterized in that, Step S1 includes: stirring 70-95% of polyisobutylene succinimide dispersant, 1.5-15% of sulfurized alkylphenol salt and 0.01-3.5% of antioxidant at 20-30°C for 40-60 minutes at a speed of 245-255 r / min to obtain a mixture.

5. A coolant according to claim 4, characterized in that, Step S2 includes: adding 1.5-15% nano solid particles to the mixture and ultrasonically dispersing it at 40-65°C for 55-65 minutes to obtain the modified nano insulating thermally conductive fluid.

6. The coolant according to claim 1, characterized in that, The alkylnaphthalene has a kinematic viscosity of 5-12 cst at 100°C and a flash point of not less than 230°C.

7. The coolant according to claim 1, characterized in that, The low-viscosity polyalphaolefin has a kinematic viscosity of 1.5 cst to 10 cst at 100°C, and the high-viscosity polyalphaolefin has a kinematic viscosity of 40 cst to 1000 cst at 100°C.

8. A coolant according to claim 1, characterized in that, The antioxidant is one or more of liquid octylbutyldiphenylamine, tert-butyl-p-cresol, and / or triethanolamine.

9. A method for preparing a coolant according to any one of claims 1-8, characterized in that, The preparation method includes the following steps: Configure the required components; Heat and mix the components.

10. The application of a coolant according to any one of claims 1-8 in electronic components.

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