Liquid cooling medium and preparation method thereof

Abstract

The invention provides a liquid cooling medium and a preparation method thereof, and relates to the technical field of material preparation, and the liquid cooling medium comprises the following components in parts by weight: 60-80 parts of a biodegradable refrigerating fluid, 5-10 parts of a nonionic surfactant, 1-5 parts of nanoscale metal oxide particles, 0.1-1 part of graphene nanosheets and 5-10 parts of phase change material microcapsules. According to the liquid cooling medium and the preparation method thereof provided by the invention, through reasonable compatibility of all the components, the obtained liquid cooling medium has good compatibility and safety, risks such as corrosion, blockage or leakage are avoided, meanwhile, the liquid cooling medium has good electrical insulation performance so as to prevent electrical short circuit and faults, and in addition, the liquid cooling medium has good application prospects. The liquid cooling medium provided by the invention also has extremely high thermal conductivity, good environmental adaptability and long-term stability.

Description

Technical Field

[0001] The present invention relates to the technical field of material preparation, and in particular to a liquid cooling medium and a preparation method thereof. Background Art

[0002] With the rapid development of high-performance computing and data centers, the heat density of electronic equipment continues to increase, and traditional air cooling technology can no longer meet the growing heat dissipation needs. Liquid cooling technology has become an effective means to solve the problem of high heat density heat dissipation due to its higher heat conduction efficiency and lower energy consumption. As the core component of the liquid cooling system, the performance of the liquid cooling medium directly affects the cooling effect and reliability of the entire system.

[0003] The existing liquid cooling media mainly include water, mineral oil, fluorinated carbon compounds, etc. These media have their own characteristics, but also have some shortcomings. For example, water has high thermal conductivity and good fluidity, but its conductivity and corrosiveness limit its application in cooling electronic equipment; although mineral oil has good insulation and stability, its thermal conductivity is low and the heat dissipation effect is limited; fluorinated carbon compounds have excellent insulation and chemical stability, but their high cost and environmental issues also limit their application.

[0004] In addition, the environmental adaptability and long-term stability of the liquid cooling medium are also key considerations. In practical applications, the liquid cooling medium may face problems such as corrosion, microbial growth, and ultraviolet degradation. These problems not only affect the cooling efficiency of the system, but also affect the stability and service life of the system, and may cause equipment damage and system failure. Therefore, a liquid cooling medium with excellent comprehensive performance, environmental safety, and long-term stability is of great significance to the development of liquid cooling technology. Summary of the invention

[0005] The present invention provides a liquid cooling medium and a preparation method thereof, so as to solve the defects of the liquid cooling medium in the prior art that the liquid cooling medium cannot have the properties of high thermal conductivity, good insulation, environmental adaptability and long-term stability, so as to realize the low-cost preparation of the liquid cooling medium with excellent comprehensive performance.

[0006] The invention provides a liquid cooling medium, comprising the following components in parts by weight: 60-80 parts of biodegradable freezing liquid, 5-10 parts of nonionic surfactant, 1-5 parts of nano-scale metal oxide particles, 0.1-1 parts of graphene nanosheets and 5-10 parts of phase change material microcapsules.

[0007] According to a liquid cooling medium provided by the present invention, the liquid cooling medium comprises the following components in parts by weight: 60-65 parts of biodegradable freezing liquid, 5-6 parts of non-ionic surfactant, 1-2 parts of nano-scale metal oxide particles, 0.1-0.3 parts of graphene nanosheets and 5-6 parts of phase change material microcapsules.

[0008] According to a liquid cooling medium provided by the present invention, the biodegradable refrigerant includes one or more of propylene glycol and modified vegetable oil.

[0009] According to a liquid cooling medium provided by the present invention, the non-ionic surfactant is polyoxyethylene alkyl ether.

[0010] According to a liquid cooling medium provided by the present invention, the phase change material microcapsule is a polymer microcapsule encapsulating a phase change material and a repair agent, the phase change material is selected from paraffin, fatty acids, lipid compounds, and hydrated salt polymers; the repair agent is an epoxy resin or a silane compound; the diameter of the phase change material microcapsule is 1-10μm, and the wall thickness is 50-200nm.

[0011] According to a liquid cooling medium provided by the present invention, the nano-scale metal oxide particles include one or more of aluminum oxide and zinc oxide, have a particle size of 5-50 nm, and are pre-plasma treated.

[0012] According to a liquid cooling medium provided by the present invention, the number of layers of the graphene nanosheets is 1-5, and the lateral size is 0.5-5 μm.

[0013] A liquid cooling medium provided by the present invention further includes 0.5-8 parts, preferably 0.9-3 parts, of an auxiliary agent; the auxiliary agent includes one or more of an anti-corrosion agent, an antibacterial agent, an ultraviolet absorber, an antioxidant and a colorant.

[0014] According to a liquid cooling medium provided by the present invention, the auxiliary agents include anti-corrosion agents, antibacterial agents, ultraviolet absorbers, antioxidants and colorants. In parts by weight, the liquid cooling medium includes: 60-80 parts of biodegradable refrigerant, 5-10 parts of non-ionic surfactants, 1-5 parts of nano-scale metal oxide particles, 0.1-1 parts of graphene nanosheets, 5-10 parts of phase change material microcapsules, 0.5-2 parts of anti-corrosion agents, 0.1-1 parts of antibacterial agents, 0.2-2 parts of ultraviolet absorbers, 0.1-1 parts of antioxidants, and 0.01-0.1 parts of colorants.

[0015] According to a liquid cooling medium provided by the present invention, the anti-corrosion agent is benzotriazole.

[0016] According to a liquid cooling medium provided by the present invention, the antibacterial agent is isothiazolinone.

[0017] According to a liquid cooling medium provided by the present invention, the ultraviolet absorber is a benzophenone compound.

[0018] According to a liquid cooling medium provided by the present invention, the antioxidant is vitamin E.

[0019] According to a liquid cooling medium provided by the present invention, the colorant is a food grade dye.

[0020] The present invention also provides a method for preparing the liquid cooling medium, comprising the following steps: After preheating the biodegradable freezing liquid to 40-60° C., a nonionic surfactant, nano-sized metal oxide particles, graphene nanosheets, phase change material microcapsules and an auxiliary agent are sequentially added to obtain a mixture; The mixture is subjected to ultrasonic treatment and microfiltration to remove impurities, and then dried using supercritical fluid technology.

[0021] According to the method for preparing the liquid cooling medium provided by the present invention, the drying using supercritical fluid technology comprises: The mixture to be dried is added to the reactor, and carbon dioxide is pressed into the system by a high-pressure pump, while being heated to a temperature exceeding the critical temperature of carbon dioxide to form a supercritical state; Under supercritical conditions, supercritical carbon dioxide penetrates the granular material, dissolves and carries residual solvent, and the supercritical carbon dioxide containing the dissolved solvent is transported to a separator, where the carbon dioxide is evaporated by reducing the pressure, and the solvent is collected or processed; The extracted particles are further dried in a supercritical carbon dioxide environment to ensure the removal of residual solvent, and the system pressure is gradually reduced to collect the dried particle material.

[0022] According to the method for preparing the liquid cooling medium provided by the present invention, after the drying is completed, microwave treatment is used to remove bubbles, and the power of the microwave is 600-1000W.

[0023] The present invention also provides a liquid cooling device, comprising: the liquid cooling medium as described above.

[0024] The present invention also provides an electronic device, comprising: the liquid cooling device as described above.

[0025] The liquid cooling medium and preparation method thereof provided by the present invention realize synergistic enhancement of the components by rationally combining biodegradable refrigerant, nonionic surfactant, nano-scale metal oxide particles, graphene nanosheets, phase change material microcapsules and additives. The obtained liquid cooling medium has good compatibility and safety, and avoids the risks of corrosion, blockage or leakage. At the same time, the liquid cooling medium has good electrical insulation properties to prevent electrical short circuits and failures. In addition, the liquid cooling medium of the present invention also has extremely high thermal conductivity, good environmental adaptability and long-term stability.

[0026] Specifically, the liquid cooling medium provided by the present invention significantly improves its thermal conductivity by combining nanoscale metal oxide particles and graphene nanosheets with high thermal conductivity. The addition of these nanomaterials not only accelerates the absorption and release of heat, but also improves the overall cooling efficiency by forming an effective heat conduction network. In particular, the two-dimensional structure of the graphene nanosheets provides the liquid cooling medium with extremely high thermal conductivity and good mechanical strength, further enhancing the heat dissipation performance. This excellent thermal management capability is crucial to the cooling needs of high-performance computing and data centers, and can effectively prevent equipment overheating and ensure stable system operation.

[0027] The liquid cooling medium provided by the present invention greatly improves its long-term stability and environmental adaptability by adding anti-corrosion agents, antibacterial agents, ultraviolet absorbers and antioxidants. These additives protect the metal parts in the liquid cooling system from corrosion, inhibit the growth of bacteria and fungi, maintain the hygiene and cleanliness of the liquid cooling medium, and reduce the blockage and corrosion problems caused by microbial activities. At the same time, the ultraviolet absorber and the antioxidant work together to protect the organic components in the liquid cooling medium from ultraviolet degradation and oxidative deterioration, thereby extending the service life. This long-term stability and environmental adaptability reduce the maintenance requirements and maintenance costs of the system and improve the user experience.

[0028] The liquid cooling medium provided by the present invention uses biodegradable refrigerant and food-grade dye as one of the main components, which not only ensures the biodegradability of the product, reduces the potential impact on the environment, but also meets environmental protection requirements; the use of colorants facilitates users to identify and detect leaks, and improves the identifiability and safety of the product. In addition, the preparation method of the present invention ensures the purity and quality of the final product, and removes insoluble impurities and oversized particles that may cause performance degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is one of the flow diagrams of the method for preparing the liquid cooling medium provided by the present invention.

[0031] Figure 2 This is the second schematic flow diagram of the method for preparing the liquid cooling medium provided by the present invention.

[0032] Figure 3 This is one of the performance test comparison diagrams of the liquid cooling medium prepared in Examples 1-4 of the liquid cooling medium provided by the present invention.

[0033] Figure 4 This is the second performance test comparison chart of the liquid cooling medium prepared in Examples 1-4 of the liquid cooling medium provided by the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "specific implementations", or "some specific implementations" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased through regular channels.

[0038] The invention provides a liquid cooling medium, comprising the following components in parts by weight: 60-80 parts of biodegradable freezing liquid, 5-10 parts of nonionic surfactant, 1-5 parts of nano-scale metal oxide particles, 0.1-1 parts of graphene nanosheets, 5-10 parts of phase change material microcapsules and 0.5-8 parts of auxiliary agents.

[0039] As an optional embodiment, the liquid cooling medium includes the following components in parts by weight: 60-65 parts of biodegradable refrigerant, 5-6 parts of non-ionic surfactant, 1-2 parts of nano-scale metal oxide particles, 0.1-0.3 parts of graphene nanosheets, 5-6 parts of phase change material microcapsules and 0.5-3 parts of additives.

[0040] As an optional embodiment, the biodegradable refrigerant includes one or more of propylene glycol and modified vegetable oil. Specifically, when the biodegradable refrigerant is a mixture of propylene glycol and modified vegetable oil, the mixing ratio of the two can be (0.8-1.2): (0.8-1.2).

[0041] In the present invention, the biodegradable refrigerant is used as the base liquid of the liquid cooling medium, which provides good thermal stability and a low freezing point, ensures fluidity in a wide temperature range, has good biodegradability, reduces environmental impact, and meets environmental protection requirements.

[0042] As an optional embodiment, the nonionic surfactant is a polyoxyethylene alkyl ether. In the present invention, the nonionic surfactant has the effect of reducing surface tension, can enhance the wettability and permeability of the liquid, help the liquid cooling medium to more effectively contact and cool the electronic equipment, stabilize the foam, reduce cavitation, and protect the pump and circulation system.

[0043] As an optional embodiment, the phase change material microcapsule is a polymer microcapsule encapsulating a phase change material and a repair agent, the phase change material is selected from one or more of paraffin, fatty acids, lipid compounds, and hydrated salt polymers; the repair agent is an epoxy resin or a silane compound; the diameter of the phase change material microcapsule is 1-10μm, and the wall thickness is 50-200nm.

[0044] Specifically, polymer microcapsules are micro-containers or packaging materials with polymer walls and shells. Specifically, a certain target object (core or inner phase) is completely coated with a continuous film of various natural or synthetic polymer compounds (wall or outer phase), without damaging the original chemical properties of the target object, and then gradually through some external stimulation or sustained release, the function of the target object is presented again on the outside, or the shielding effect of the capsule wall is relied on to protect the core material. Polymer microcapsules have many characteristics such as low density, large specific surface area, good permeability and high loading capacity, and their composition, size and surface properties are richly adjustable. The polymer wall shell can be prepared based on one or more of polyvinyl alcohol, polyurethane, polyester, polyamide, polyvinyl chloride, polyacrylamide and polydopamine.

[0045] The polymer microcapsules in the embodiments of the present invention are preferably purchased from Shenzhen Daxita Technology Co., Ltd., Guangzhou Zhiwei New Materials Technology Co., Ltd., Honeywell Technology Company or Forsman Technology Company.

[0046] Fatty acids are a class of compounds composed of three elements: carbon, hydrogen, and oxygen. They can be divided into short-chain fatty acids, medium-chain fatty acids, and long-chain fatty acids according to the length of the carbon chain. They can be divided into saturated fatty acids and unsaturated fatty acids according to whether the carbon-hydrogen chain is saturated or unsaturated. Lipid compounds are a general term for esters and their derivatives generated by the reaction of fatty acids and alcohols, including oils, fats, and lipids.

[0047] Optionally, the fatty acid in the embodiment of the present invention can be selected from one or more of palmitic acid, stearic acid, oleic acid and linoleic acid.

[0048] Optionally, the lipid compound in the embodiment of the present invention can be selected from one or more of glycerophospholipid compounds and glyceride compounds.

[0049] Optionally, the hydrated salt polymer in the embodiment of the present invention may be selected from one or more of a hydrated copper sulfate polymer and a hydrated sodium carbonate polymer.

[0050] In the present invention, the phase change material microcapsules absorb or release a large amount of heat during the phase change process to achieve temperature regulation and control. The encapsulation of the microcapsules prevents leakage of the phase change material and prolongs the service life of the liquid cooling medium.

[0051] As an optional embodiment, the nano-scale metal oxide particles include one or more of aluminum oxide and zinc oxide, with a particle size of 5-50 nm, and the nano-scale metal oxide particles are pre-plasma treated.

[0052] Specifically, the step of pre-plasma treating the nano-sized metal oxide particles comprises: The nano-sized metal oxide particles are placed in a plasma reactor, and argon, nitrogen or oxygen is used as plasma gas. Under vacuum conditions, the plasma gas is introduced into the reactor for a treatment time of 45 seconds to 2 minutes.

[0053] In the present invention, the nano-scale metal oxide particles have high thermal conductivity, can significantly improve the thermal conductivity of the liquid cooling medium, accelerate the absorption and release of heat, and the nano-scale particle size helps the particles to be stably dispersed in the liquid to avoid sedimentation.

[0054] As an optional embodiment, the number of layers of the graphene nanosheet is 1-5, and the lateral size is 0.5-5 μm.

[0055] In the present invention, the graphene nanosheets can provide extremely high thermal conductivity and good mechanical strength, further enhancing the heat dissipation performance of the liquid cooling medium. The two-dimensional structure of graphene helps to form a heat conduction network and improve the overall cooling efficiency.

[0056] As an optional embodiment, the auxiliary agent includes one or more of an anti-corrosion agent, an antibacterial agent, an ultraviolet absorber, an antioxidant and a colorant.

[0057] Specifically, anti-corrosion agents can protect metal components in liquid cooling systems from corrosion and extend system life by adsorbing on the metal surface to form a protective film to prevent oxidation reactions.

[0058] Antimicrobial agents can inhibit the growth of bacteria and fungi, keep the liquid cooling medium sanitary and clean, and reduce clogging and corrosion problems caused by microbial activity.

[0059] UV absorbers can absorb UV radiation, protect organic components in the liquid cooling medium from UV degradation, and reduce the aging effect of UV on liquid cooling system materials.

[0060] Antioxidants can prevent liquid cooling media from deteriorating due to oxidation, maintain its chemical stability and service life, remove free radicals, and protect other chemical components in the system.

[0061] Colorants can provide color to the liquid cooling medium, making it easier for users to identify and detect leaks. The use of food-grade dyes ensures safety, and even if leaks occur, it will not cause harm to the environment and personnel.

[0062] Optionally, in some embodiments of the present invention, the additives include anti-corrosion agents, antibacterial agents, ultraviolet absorbers, antioxidants and colorants. In parts by weight, the liquid cooling medium includes: 60-80 parts of biodegradable refrigerant, 5-10 parts of non-ionic surfactant, 1-5 parts of nano-scale metal oxide particles, 0.1-1 parts of graphene nanosheets, 5-10 parts of phase change material microcapsules, 0.5-2 parts of anti-corrosion agents, 0.1-1 parts of antibacterial agents, 0.2-2 parts of ultraviolet absorbers, 0.1-1 parts of antioxidants, and 0.01-0.1 parts of colorants.

[0063] As an optional embodiment, the anti-corrosion agent is benzotriazole.

[0064] As an optional embodiment, the antibacterial agent is isothiazolinone.

[0065] As an optional embodiment, the ultraviolet absorber is a benzophenone compound.

[0066] Preferably, the benzophenone compound is selected from one or more of benzophenone, acetophenone, propiophenone and benzoyl alcohol. The benzophenone compound is preferably purchased from Hubei Kewode Chemical Co., Ltd., Fengtai (Tianjin) Fine Chemical Co., Ltd. or Wuhan Rongcan Biotechnology Co., Ltd.

[0067] As an optional embodiment, the antioxidant is vitamin E.

[0068] As an optional embodiment, the colorant is a food grade dye.

[0069] As a preferred embodiment, the liquid cooling medium provided by the present invention includes the following components in parts by weight: 63-67 parts of biodegradable refrigerant, 5-7 parts of non-ionic surfactant, 1-3 parts of nano-sized metal oxide particles, 0.2-0.4 parts of graphene nanosheets, 5-7 parts of phase change material microcapsules, 0.7-0.9 parts of corrosion inhibitors, 0.2-0.4 parts of antibacterial agents, 0.6-0.8 parts of ultraviolet absorbers, 0.2-0.4 parts of antioxidants, and 0.02-0.04 parts of colorants.

[0070] The biodegradable refrigerant is a mixture of propylene glycol and modified vegetable oil in a mass ratio of (0.8-1.2): (0.8-1.2); the non-ionic surfactant is polyoxyethylene alkyl ether; the nano-scale metal oxide particles are a mixture of zinc oxide and aluminum oxide in a mass ratio of (0.8-1.2): (0.8-1.2), and the particle size is 18-22nm; the graphene nanosheets are 2-3 layers, and the lateral size is 0.8-1.2μm; hydrated salts are encapsulated in the phase change material microcapsules, and the diameter of the phase change material microcapsules is 2-4μm and the wall thickness is 70-80nm; the corrosion inhibitor is benzotriazole; the antibacterial agent is isothiazolinone; the ultraviolet absorber is a benzophenone compound; the antioxidant is vitamin E; and the colorant is a food-grade dye.

[0071] As a preferred embodiment, the biodegradable refrigerant can be purchased from Jiatai Jingheng Co., Ltd. or Kelansu Co., Ltd. The nano-scale metal oxide particles can be purchased from Jiaxing Rare Earth Co., Ltd. The graphene nanosheets can be purchased from Nanjing Xianfeng Nanomaterial Technology Co., Ltd. or ACSMaterial Technology Co., Ltd.

[0072] Figure 1 The present invention also provides a method for preparing the above-mentioned liquid cooling medium, such as Figure 1 As shown, the method comprises the following steps: Step 101, preheating the biodegradable refrigerant to 40-60° C., and sequentially adding a nonionic surfactant, nano-scale metal oxide particles, graphene nanosheets, phase change material microcapsules and an additive to obtain a mixture; Step 102: subjecting the mixture to ultrasonic treatment and microfiltration to remove impurities, and then drying using supercritical fluid technology.

[0073] As an optional embodiment, the drying using supercritical fluid technology includes: adding the mixture to be dried into a reaction kettle, using a high-pressure pump to pressurize carbon dioxide into the system, and heating it to a temperature exceeding the critical temperature of carbon dioxide to form a supercritical state; Under supercritical conditions, supercritical carbon dioxide will penetrate the granular material, dissolve and carry residual solvent. The supercritical carbon dioxide containing the dissolved solvent is transported to the separator, where the carbon dioxide is evaporated by reducing the pressure, and the solvent is collected or processed. The extracted particles are further dried in a supercritical carbon dioxide environment to ensure the removal of residual solvent, and the system pressure is gradually reduced to collect the dried particle material.

[0074] As an optional embodiment, after the drying is completed, microwave treatment is used to remove bubbles, and the power of the microwave is 600-1000W.

[0075] In a liquid cooling system, the presence of bubbles will also affect the fluidity and heat conduction efficiency of the liquid, and even cause system failure. Therefore, it is important to effectively remove the bubbles in the liquid cooling medium. The present invention selects the last microwave treatment to effectively remove the bubbles. It is understandable that in order to better remove the bubbles, the liquid can be left to stand before the microwave treatment to allow some bubbles to float and be released.

[0076] Optionally, Figure 2 FIG. 2 is a flow chart of the method for preparing the liquid cooling medium provided by the present invention. As a preferred embodiment of the present invention, Figure 2 As shown, the method for preparing the liquid cooling medium comprises the following steps: Step 1: Preheating the biodegradable refrigerant: preheat the biodegradable refrigerant to 40-60°C for 0.5-1h.

[0077] In this step, the biodegradable refrigerant may have a higher viscosity at a lower temperature, which will affect the mixing efficiency of subsequent additives. Preheating can reduce its viscosity, allowing subsequent additives to be mixed more easily and evenly, and can improve the compatibility with the non-ionic surfactants and other additives to be added, thereby improving the mixing efficiency and reducing the overall mixing and reaction time. Because the preheated liquid can reach the final required process temperature more quickly, it is ensured that the biodegradable refrigerant is always maintained within the ideal temperature range throughout the preparation process, which helps to ensure the quality of the final product.

[0078] Step 2, adding a nonionic surfactant: slowly add the nonionic surfactant to the biodegradable freezing liquid preheated in step 1 under stirring conditions of 200-400 rpm for 10-15 minutes to ensure sufficient mixing.

[0079] In this step, non-ionic surfactants are added to reduce the surface tension of the biodegradable refrigerant to improve mixing efficiency, enhance thermal stability, improve compatibility between different components, protect system components, reduce the generation of bubbles and foam, improve heat transfer performance, simplify subsequent processing, ensure environmental protection and safety, control production costs, facilitate expansion according to application requirements, maintain chemical stability, optimize the user experience, adapt to different environmental conditions, simplify maintenance and cleaning processes, and ultimately improve the heat transfer efficiency of the liquid cooling medium. This step provides comprehensive advantages for the performance and operation of the liquid cooling medium, ensuring its effectiveness and reliability in high-performance computing and data center cooling applications.

[0080] Step 3, adding nano-sized metal oxide particles and graphene nanosheets: Based on step 2, continue to add nano-sized metal oxide particles and graphene nanosheets, increase the rotation speed to 400-500 rpm, and stir for 30-45 minutes to keep the particles suspended.

[0081] Before adding the nano-sized metal oxide particles, the nano-sized metal oxide particles are subjected to plasma treatment. Specifically, the nano-sized metal oxide particles are placed in a plasma reactor, and argon, nitrogen or oxygen is used as plasma gas. Under vacuum conditions, the plasma gas is introduced into the reactor for a treatment time of 45 seconds to 2 minutes.

[0082] In this step, the addition of nano-sized metal oxide particles and graphene nanosheets is to utilize the high thermal conductivity of these materials, significantly improve the heat conduction capacity of the liquid cooling medium, thereby accelerating the absorption and release of heat, and enhancing the heat dissipation performance. By continuing to add these nano-materials to the biodegradable refrigerant after mixing the non-ionic surfactant, and stirring for 30-45 minutes under the condition of increasing the speed to 400-500rpm, the suspended state of the particles can be effectively maintained to prevent sedimentation, ensure that they are evenly dispersed in the liquid, and form an effective heat conduction network. This step is the key to achieving the excellent cooling effect of the liquid cooling medium, and provides a basis for its efficient heat transfer in high-performance computing and data center cooling applications. Moreover, before adding nano-sized metal oxide particles, the nano-sized metal oxide particles are plasma treated, which can improve the surface properties of the nano-particles and enhance their compatibility and interaction with other components in the liquid cooling medium.

[0083] Step 4, adding phase change material microcapsules: Based on step 3, continue to add phase change material microcapsules, adjust the stirring speed to 300-400 rpm, and continue stirring for 20-25 minutes to ensure that the phase change material microcapsules are evenly distributed.

[0084] In this step, the phase change material microcapsules are added to utilize the heat absorption and release characteristics of the phase change material in the microcapsules to enhance the temperature regulation ability of the liquid cooling medium. By adding these microcapsules to the mixed liquid containing nano-sized metal oxide particles and graphene nanosheets, and continuing to stir at a stirring speed of 300-400rpm for 20-25 minutes, it can be ensured that the phase change material microcapsules are evenly distributed in the liquid cooling medium to avoid agglomeration and sedimentation. This step is crucial to achieving stability and efficient thermal management of the liquid cooling medium when the temperature changes, so that it can provide excellent temperature control and heat dissipation performance in high-performance computing and data center cooling applications.

[0085] Step 5, adding anti-corrosion agent, antibacterial agent, UV absorber and antioxidant: Based on step 4, continue to add anti-corrosion agent, antibacterial agent, UV absorber and antioxidant, reduce the stirring speed to 200-300rpm, and continue stirring for 10-15min to ensure that all additives are completely dissolved and dispersed.

[0086] In this step, the long-term stability and performance protection of the liquid cooling medium can be improved. These additives can prevent corrosion of metal parts, inhibit bacterial growth, protect organic components from ultraviolet degradation, and remove free radicals that may damage the performance of the liquid cooling medium. By continuing to add these chemical components to the mixed liquid containing phase change microcapsules and stirring for 10-15 minutes at a reduced stirring speed of 200-300rpm, ensure that all additives are completely dissolved and evenly dispersed, thereby extending the service life of the liquid cooling medium, maintaining its cooling efficiency, and ensuring the overall health and reliability of the system. This step is crucial to achieving the long-term effectiveness and environmental adaptability of the liquid cooling medium in practical applications.

[0087] Step 6, adding colorant: on the basis of step 5, continue to add colorant, reduce the stirring speed to 150-250 rpm, continue stirring for 5-10 minutes, ensure that the colorant is completely dissolved and evenly colored to obtain a mixture.

[0088] In this step, the step of adding colorant is to ensure that the final product has a consistent color, which is convenient for users to identify and detect leaks, while maintaining the aesthetics of the liquid cooling medium. By adding colorant to the solution in which all the previous additives have been mixed, and continuing to stir for 5-10 minutes under the condition of reducing the stirring speed to 150-250rpm, it can be ensured that the colorant is completely dissolved and evenly dispersed in the liquid cooling medium, thereby obtaining a liquid cooling medium with uniform color and stable performance.

[0089] Step 7, ultrasonic treatment: The mixture in step 6 is ultrasonically treated by a 40-50 kHz ultrasonic oscillator for 50-60 min to disperse the particle aggregates and degas.

[0090] In this step, in order to use the energy of ultrasound to disperse the particle aggregates in the mixture and remove the gas dissolved in the liquid to improve the uniformity and heat transfer performance of the liquid cooling medium, the mixture is treated with a 40-50kHz ultrasonic oscillator for 50-60 minutes. The cavitation effect generated by the ultrasound can destroy the agglomeration between the particles, so that the nano-scale metal oxide particles and graphene nanosheets are more evenly dispersed in the liquid, while helping to remove the gas that may form bubbles, ensuring that the liquid cooling medium has better thermal conductivity efficiency and longer service life in high-performance computing and data center cooling applications.

[0091] Step 8: Microfiltration to remove impurities: Use a 0.2-0.4 μm filter membrane to microfilter the mixture to remove insoluble impurities and larger particles.

[0092] In this step, in order to ensure the purity and quality of the final product, the mixture is microfiltered using a 0.2-0.4μm filter membrane to effectively remove insoluble impurities and oversized particles, preventing these potential contaminants from affecting the performance and reliability of the liquid cooling medium.

[0093] Step 9: Supercritical fluid drying: Use supercritical fluid technology to dry the particles to ensure the stability of the material and remove residual solvents. The temperature conditions are 35-50°C and the pressure is 80-150 bar. Specifically: The mixture to be dried is added to the reactor, and carbon dioxide is pressed into the system by a high-pressure pump, while being heated to a temperature exceeding the critical temperature of carbon dioxide to form a supercritical state; Under supercritical conditions, supercritical carbon dioxide penetrates the granular material, dissolves and carries residual solvent, and the supercritical carbon dioxide containing the dissolved solvent is transported to a separator, where the carbon dioxide is evaporated by reducing the pressure, and the solvent is collected or processed; The extracted particles continue to dry in a supercritical carbon dioxide environment to ensure that all residual solvents are completely removed, gradually reduce the system pressure, and use a collector to collect the dried particle material.

[0094] In this step, supercritical fluid technology is used for drying in order to ensure the stability of the material and completely remove the residual solvent. The mixture is added to the reactor and carbon dioxide is pressed into it using a high-pressure pump. The mixture is heated to a temperature exceeding the critical temperature of carbon dioxide to form a supercritical state. The supercritical carbon dioxide penetrates the granular material to dissolve and carry the residual solvent to the separator. The carbon dioxide is evaporated by reducing the pressure and the solvent is collected. Then, the extracted particles continue to be dried in a supercritical carbon dioxide environment to completely remove all residual solvents, reduce the system pressure and collect the dried granular material.

[0095] Step 10, microwave treatment to remove bubbles: The dried particles obtained in step 9 are subjected to microwave treatment at a power of 600-1000 W for 10 minutes to remove bubbles in the mixture and ensure heat conduction efficiency.

[0096] In order to facilitate the understanding of the liquid cooling medium and the preparation method thereof provided by the present invention, some specific embodiments are used for illustration below.

[0097] It should be noted that, unless otherwise specified, all raw materials used in the following examples are known commercially available products.

[0098] In the following embodiments, before adding the nano-sized metal oxide particles, the nano-sized metal oxide particles are also subjected to plasma treatment. Specifically, the nano-sized metal oxide particles are placed in a plasma reactor, and argon, nitrogen or oxygen is used as plasma gas. Under vacuum conditions, the plasma gas is introduced into the reactor for a treatment time of 45 seconds to 2 minutes.

[0099] Example 1 This embodiment provides a liquid cooling medium for a liquid cooling device, and its composition, in parts by weight, is as follows: 75 parts of biodegradable refrigerant (a mixture of propylene glycol and modified vegetable oil in a mass ratio of 1:1), 8 parts of non-ionic surfactant (polyoxyethylene alkyl ether), 3 parts of nanoscale metal oxide particles (a mixture of aluminum oxide and zinc oxide in a mass ratio of 1:1, particle size 10nm), 0.5 parts of graphene nanosheets (single layer, lateral size 2μm), 8 parts of phase change material microcapsules (encapsulated with paraffin, diameter 5μm, wall thickness 100nm), 1.2 parts of corrosion inhibitor (benzotriazole), 0.5 parts of antibacterial agent (isothiazolinone), 1.2 parts of ultraviolet absorber (benzophenone compound), 0.5 parts of antioxidant (vitamin E), 0.05 parts of colorant (food grade dye), and epoxy resin or silane compound as repair agent.

[0100] This embodiment also provides a method for preparing the above liquid cooling medium, and the specific steps are as follows: Step 1, preheating the biodegradable refrigerant: preheat the biodegradable refrigerant to 40-60°C for 0.5-1h. This step mainly reduces the viscosity of the biodegradable refrigerant to ensure that subsequent additives can be mixed more easily.

[0101] Step 2, adding a nonionic surfactant: slowly add the nonionic surfactant to the biodegradable freezing liquid preheated in step 1 under stirring conditions of 300 rpm for 10-15 minutes to ensure sufficient mixing.

[0102] Step 3, adding nano-sized metal oxide particles and graphene nanosheets: Based on step 2, continue to add nano-sized metal oxide particles and graphene nanosheets, increase the rotation speed to 400 rpm, and stir for 30-45 minutes to keep the particles suspended.

[0103] Step 4, adding phase change material microcapsules: based on step 3, continue to add phase change material microcapsules, adjust the stirring speed to 350 rpm, and continue stirring for 20 minutes to ensure that the phase change material microcapsules are evenly distributed.

[0104] Step 5, adding corrosion inhibitors, antibacterial agents, UV absorbers and antioxidants: Based on step 4, continue to add corrosion inhibitors, antibacterial agents, UV absorbers and antioxidants, reduce the stirring speed to 300 rpm, and continue stirring for 10 minutes to ensure that all additives are completely dissolved and dispersed.

[0105] Step 6, adding colorant: continue to add colorant on the basis of step 5, reduce the stirring speed to 250 rpm, continue stirring for 5 minutes, ensure that the colorant is completely dissolved and evenly colored to obtain a mixture.

[0106] Step 7, ultrasonic treatment: The mixture in step 6 is ultrasonically treated by a 40 kHz ultrasonic oscillator for 60 min to disperse the particle aggregates and degas.

[0107] Step 8: Microfiltration to remove impurities: Use a 0.2-0.4 μm filter membrane to microfilter the mixture to remove insoluble impurities and larger particles.

[0108] Step 9: Supercritical fluid drying: Use supercritical fluid technology to dry the particles to ensure the stability of the material and remove residual solvents. Specifically: The mixture to be dried is added to the reactor, and carbon dioxide is pressed into the system by a high-pressure pump, while being heated to a temperature exceeding the critical temperature of carbon dioxide to form a supercritical state; Under supercritical conditions, supercritical carbon dioxide will penetrate the granular material, dissolve and carry residual solvent. The supercritical carbon dioxide containing the dissolved solvent is transported to the separator, where the carbon dioxide is evaporated by reducing the pressure, and the solvent is collected or processed. The extracted particles continue to dry in a supercritical carbon dioxide environment to ensure that all residual solvents are completely removed, gradually reduce the system pressure, and use a collector to collect the dried particle material.

[0109] Step 10, microwave treatment to remove bubbles: The dried particles obtained in step 9 are subjected to microwave treatment at a power of 800 W for 10 min to remove bubbles in the mixture and ensure heat conduction efficiency.

[0110] Example 2 This embodiment provides a liquid cooling medium for a liquid cooling device, and its composition, in parts by weight, is as follows: 80 parts of biodegradable refrigerant (propylene glycol), 10 parts of non-ionic surfactant (polyoxyethylene alkyl ether), 5 parts of nanoscale metal oxide particles (zinc oxide, particle size 5nm), 1 part of graphene nanosheets (2-3 layers, lateral size 5μm), 10 parts of phase change material microcapsules (encapsulated with fatty acids, diameter 10μm, wall thickness 200nm), 2 parts of corrosion inhibitor (benzotriazole), 1 part of antibacterial agent (isothiazolinone), 1.5 parts of ultraviolet absorber (benzophenone compound), 1 part of antioxidant (vitamin E), and 0.1 part of colorant (food grade dye).

[0111] This embodiment also provides a method for preparing the above-mentioned liquid cooling medium, and the steps are as follows: Step 1, preheating the biodegradable refrigerant: preheat the biodegradable refrigerant to 40-60°C for 0.5-1h. This step mainly reduces the viscosity of the biodegradable refrigerant to ensure that subsequent additives can be mixed more easily.

[0112] Step 2, adding a nonionic surfactant: slowly add the nonionic surfactant to the biodegradable freezing liquid preheated in step 1 under stirring conditions of 300 rpm for 10-15 minutes to ensure sufficient mixing.

[0113] Step 3, adding nano-sized metal oxide particles and graphene nanosheets: Based on step 2, continue to add nano-sized metal oxide particles and graphene nanosheets, increase the rotation speed by 500 rpm, and stir for 30-45 minutes to keep the particles suspended.

[0114] Step 4, adding phase change material microcapsules: based on step 3, continue to add phase change material microcapsules, adjust the stirring speed to 350 rpm, and continue stirring for 20 minutes to ensure that the phase change material microcapsules are evenly distributed.

[0115] Step 5, adding corrosion inhibitors, antibacterial agents, UV absorbers and antioxidants: Based on step 4, continue to add corrosion inhibitors, antibacterial agents, UV absorbers and antioxidants, reduce the stirring speed to 300 rpm, and continue stirring for 10 minutes to ensure that all additives are completely dissolved and dispersed.

[0116] Step 6, adding colorant: continue to add colorant on the basis of step 5, reduce the stirring speed to 250 rpm, continue stirring for 5 minutes, ensure that the colorant is completely dissolved and evenly colored to obtain a mixture.

[0117] Step 7, ultrasonic treatment: The mixture in step 6 is ultrasonically treated by a 40 kHz ultrasonic oscillator for 60 min to disperse the particle aggregates and degas.

[0118] Step 8: Microfiltration to remove impurities: Use a 0.2-0.4 μm filter membrane to microfilter the mixture to remove insoluble impurities and larger particles.

[0119] Step 9: Supercritical fluid drying: Use supercritical fluid technology to dry the particles to ensure the stability of the material and remove residual solvents. Specifically: The mixture to be dried is added to the reactor, and carbon dioxide is pressed into the system by a high-pressure pump, while being heated to a temperature exceeding the critical temperature of carbon dioxide to form a supercritical state; Under supercritical conditions, supercritical carbon dioxide will penetrate the granular material, dissolve and carry residual solvent. The supercritical carbon dioxide containing the dissolved solvent is transported to the separator, where the carbon dioxide is evaporated by reducing the pressure, and the solvent is collected or processed. The extracted particles continue to dry in a supercritical carbon dioxide environment to ensure that all residual solvents are completely removed, gradually reduce the system pressure, and use a collector to collect the dried particle material.

[0120] Step 10, microwave treatment to remove bubbles: The dried particles obtained in step 9 are subjected to microwave treatment at a power of 800 W for 10 min to remove bubbles in the mixture and ensure heat conduction efficiency.

[0121] It should be noted that the preparation method of this embodiment is basically the same as that of Example 1, except that the stirring speed in step 3 is adjusted to 500 rpm to better disperse the nanoparticles.

[0122] Example 3 This embodiment provides a liquid cooling medium for a liquid cooling device, and its composition, in parts by weight, is as follows: 60 parts of biodegradable refrigerant (modified vegetable oil), 5 parts of non-ionic surfactant (polyoxyethylene alkyl ether), 1 part of nanoscale metal oxide particles (aluminum oxide, particle size 50nm), 0.1 parts of graphene nanosheets (single layer, lateral size 0.5μm), 5 parts of phase change material microcapsules (encapsulated with lipid compounds, diameter 1μm, wall thickness 50nm), 0.5 parts of corrosion inhibitor (benzotriazole), 0.1 parts of antibacterial agent (isothiazolinone), 0.2 parts of ultraviolet absorber (benzophenone compound), and 0.1 parts of antioxidant (vitamin E).

[0123] This embodiment also provides a method for preparing the above-mentioned liquid cooling medium, and the steps are as follows: Step 1, preheating the biodegradable refrigerant: preheat the biodegradable refrigerant to 40-60°C for 0.5-1h. This step mainly reduces the viscosity of the biodegradable refrigerant to ensure that subsequent additives can be mixed more easily.

[0124] Step 2, adding a nonionic surfactant: slowly add the nonionic surfactant to the biodegradable freezing liquid preheated in step 1 under stirring conditions of 300 rpm for 10-15 minutes to ensure sufficient mixing.

[0125] Step 3, adding nano-sized metal oxide particles and graphene nanosheets: Based on step 2, continue to add nano-sized metal oxide particles and graphene nanosheets, increase the rotation speed to 400 rpm, and stir for 30-45 minutes to keep the particles suspended.

[0126] Step 4, adding phase change material microcapsules: based on step 3, continue to add phase change material microcapsules, adjust the stirring speed to 350 rpm, and continue stirring for 20 minutes to ensure that the phase change material microcapsules are evenly distributed.

[0127] Step 5, adding corrosion inhibitors, antibacterial agents, UV absorbers and antioxidants: Based on step 4, continue to add corrosion inhibitors, antibacterial agents, UV absorbers and antioxidants, reduce the stirring speed to 300 rpm, and continue stirring for 10 minutes to ensure that all additives are completely dissolved and dispersed.

[0128] Step 6, adding colorant: continue to add colorant on the basis of step 5, reduce the stirring speed to 250 rpm, continue stirring for 5 minutes, ensure that the colorant is completely dissolved and evenly colored to obtain a mixture.

[0129] Step 7, ultrasonic treatment: The mixture in step 6 is ultrasonically treated by a 40 kHz ultrasonic oscillator for 60 min to disperse the particle aggregates and degas.

[0130] Step 8: Microfiltration to remove impurities: Use a 0.2-0.4 μm filter membrane to microfilter the mixture to remove insoluble impurities and larger particles.

[0131] Step 9: Supercritical fluid drying: Use supercritical fluid technology to dry the particles to ensure the stability of the material and remove residual solvents. Specifically: The mixture to be dried is added to the reactor, and carbon dioxide is pressed into the system by a high-pressure pump, while being heated to a temperature exceeding the critical temperature of carbon dioxide to form a supercritical state; Under supercritical conditions, supercritical carbon dioxide will penetrate the granular material, dissolve and carry residual solvent. The supercritical carbon dioxide containing the dissolved solvent is transported to the separator, where the carbon dioxide is evaporated by reducing the pressure, and the solvent is collected or processed. The extracted particles continue to dry in a supercritical carbon dioxide environment to ensure that all residual solvents are completely removed, gradually reduce the system pressure, and use a collector to collect the dried particle material.

[0132] Step 10, microwave treatment to remove bubbles after standing: The dried particles obtained in step 9 are subjected to microwave treatment at a power of 800 W for 10 minutes to remove bubbles in the mixture and ensure heat conduction efficiency.

[0133] It should be noted that the preparation method of this embodiment is basically the same as that of Example 1, except that a standing step is added before the microwave treatment in step ten to allow any bubbles to rise and release naturally.

[0134] Example 4 This embodiment provides a liquid cooling medium for a liquid cooling device, and its composition, in parts by weight, is as follows: 65 parts of biodegradable refrigerant (a mixture of propylene glycol and modified vegetable oil in a mass ratio of 1:1), 6 parts of non-ionic surfactant (polyoxyethylene alkyl ether), 2 parts of nanoscale metal oxide particles (a mixture of zinc oxide and aluminum oxide in a mass ratio of 1:1, particle size 20nm), 0.3 parts of graphene nanosheets (2-3 layers, lateral size 1μm), 6 parts of phase change material microcapsules (encapsulated with hydrated salt, 3μm in diameter, 75nm in wall thickness), 0.8 parts of corrosion inhibitor (benzotriazole), 0.3 parts of antibacterial agent (isothiazolinone), 0.7 parts of ultraviolet absorber (benzophenone compound), 0.3 parts of antioxidant (vitamin E), and 0.03 parts of colorant (food-grade dye).

[0135] This embodiment also provides a method for preparing the above-mentioned liquid cooling medium, and the steps are as follows: Step 1, preheating the biodegradable refrigerant: preheat the biodegradable refrigerant to 40-60°C for 0.5-1h. This step mainly reduces the viscosity of the biodegradable refrigerant to ensure that subsequent additives can be mixed more easily.

[0136] Step 2, adding a nonionic surfactant: slowly add the nonionic surfactant to the biodegradable freezing liquid preheated in step 1 under stirring conditions of 300 rpm for 10-15 minutes to ensure sufficient mixing.

[0137] Step 3, adding nano-sized metal oxide particles and graphene nanosheets: Based on step 2, continue to add nano-sized metal oxide particles and graphene nanosheets, increase the rotation speed to 400 rpm, and stir for 30-45 minutes to keep the particles suspended.

[0138] Step 4, adding phase change material microcapsules: based on step 3, continue to add phase change material microcapsules, adjust the stirring speed to 350 rpm, and continue stirring for 20 minutes to ensure that the phase change material microcapsules are evenly distributed.

[0139] Step 5, adding corrosion inhibitors, antibacterial agents, UV absorbers and antioxidants: Based on step 4, continue to add corrosion inhibitors, antibacterial agents, UV absorbers and antioxidants, reduce the stirring speed to 300 rpm, and continue stirring for 10 minutes to ensure that all additives are completely dissolved and dispersed.

[0140] Step 6, adding colorant: continue to add colorant on the basis of step 5, reduce the stirring speed to 250 rpm, continue stirring for 5 minutes, ensure that the colorant is completely dissolved and evenly colored to obtain a mixture.

[0141] Step 7, ultrasonic treatment: The mixture in step 6 is ultrasonically treated by a 40 kHz ultrasonic oscillator for 60 min to disperse the particle aggregates and degas.

[0142] Step 8: Microfiltration to remove impurities: Use a 0.2-0.4 μm filter membrane to microfilter the mixture to remove insoluble impurities and larger particles.

[0143] Step 9: Supercritical fluid drying: Use supercritical fluid technology to dry the particles to ensure the stability of the material and remove residual solvents. The temperature conditions are 35-45°C and the pressure is 80-100 bar. Specifically: The mixture to be dried is added to the reactor, and carbon dioxide is pressed into the system by a high-pressure pump, while being heated to a temperature exceeding the critical temperature of carbon dioxide to form a supercritical state; Under supercritical conditions, supercritical carbon dioxide will penetrate the granular material, dissolve and carry residual solvent. The supercritical carbon dioxide containing the dissolved solvent is transported to the separator, where the carbon dioxide is evaporated by reducing the pressure, and the solvent is collected or processed. The extracted particles continue to dry in a supercritical carbon dioxide environment to ensure that all residual solvents are completely removed, gradually reduce the system pressure, and use a collector to collect the dried particle material.

[0144] Step 10, microwave treatment to remove bubbles: The dried particles obtained in step 9 are subjected to microwave treatment at a power of 800 W for 10 min to remove bubbles in the mixture and ensure heat conduction efficiency.

[0145] It should be noted that the preparation method of this embodiment is basically the same as that of Example 1, except that lower pressure and temperature conditions are used in the supercritical fluid technology drying step in step nine to reduce costs. The temperature conditions are 35-45°C and the pressure is 80-100 bar.

[0146] Performance Testing The liquid cooling medium prepared in the above-mentioned embodiments 1-4 was subjected to performance tests, and the test items included: (1) Thermal conductivity test: Use a thermal conductivity tester to measure the thermal conductivity of the liquid cooling medium and record the thermal conductivity values ​​at different temperatures.

[0147] (2) Viscosity test: Use a viscometer to measure the dynamic and kinematic viscosity of the liquid cooling medium and record the viscosity values ​​at different temperatures.

[0148] (3) Thermal stability test: The thermal stability of the liquid cooling medium is tested by heating at 35°C for 10 minutes and cooling for 10 minutes, and then gradually increasing the temperature to 45°C to observe whether there is any performance degradation or component separation.

[0149] (4) Corrosion resistance test: The liquid cooling medium is brought into contact with different types of metals to simulate long-term use and check the corrosion of the metal samples.

[0150] (5) Antimicrobial performance test: Evaluate the antimicrobial performance of the liquid cooling medium by the culture dish method or similar microbial testing method and record the bacterial growth.

[0151] Table 1 is a performance test comparison table of the liquid cooling media prepared in Examples 1-4. Figure 3 This is one of the performance test comparison diagrams of the liquid cooling medium prepared in Examples 1-4 of the liquid cooling medium provided by the present invention. Figure 4 This is the second performance test comparison chart of the liquid cooling medium prepared in Examples 1-4 of the liquid cooling medium provided by the present invention.

[0152] The performance test results of the liquid cooling medium prepared in the above Examples 1-4 are shown in Table 1. Figure 3 and Figure 4 shown.

[0153] Table 1 Performance test comparison table of the liquid cooling medium prepared in Examples 1-4

[0154] From Table 1, Figure 2 and Figure 3 As shown: Thermal conductivity: Examples 1-4 show gradually improved thermal conductivity values, from 0.5 W / mK to 0.65 W / mK, all of which show better thermal conductivity performance compared to the 0.4 W / mK of the market standard product. This indicates that the liquid cooling medium of the examples has higher efficiency in transferring heat, which is particularly important for high-performance computing and data center cooling applications.

[0155] Viscosity: From Example 1 to Example 4, the viscosity values ​​show a gradually decreasing trend, ranging from 30 cP to 24 cP, while the viscosity of the market standard product is 32 cP. Lower viscosity means that the liquid cooling medium has better fluidity and can circulate more efficiently through the cooling system, reducing pumping costs and potentially reducing system noise.

[0156] Thermal stability and antimicrobial properties: All embodiments exhibit good thermal stability, which means that the liquid cooling medium can remain stable without performance degradation or decomposition under long-term operation and extreme temperature conditions. At the same time, all embodiments exhibit strong antimicrobial properties, reducing the risk of microbial growth and keeping the system clean and running efficiently.

[0157] Corrosion: No corrosion occurred in any of the embodiments, which has a good effect on maintaining the integrity of the equipment and extending its service life.

[0158] In summary, the liquid cooling medium of Examples 1-4 performs well in thermal conductivity, viscosity, user experience, thermal stability, antibacterial performance and corrosion resistance, and is significantly better than the standard products on the market. The improvement of these properties makes the liquid cooling medium of the embodiments an ideal choice for high-performance computing and data center cooling applications, and can provide a more efficient, more reliable and more economical cooling solution. It can be seen that the embodiments of the present invention, through precise component selection and strict preparation steps, realize the preparation of high-performance liquid cooling medium, meet the strict requirements of high-performance computing and data center cooling applications, and ensure the reliability, stability, environmental protection and economic benefits of the product.

[0159] The liquid cooling medium provided by the present invention selects a biodegradable refrigerant as a base liquid, which not only has good thermal stability and a low freezing point, but also ensures fluidity within a wide temperature range, reduces the impact on the environment, and meets environmental protection requirements. The specific components of the refrigerant and their weight proportions, as well as its preheating treatment steps, are intended to improve mixing efficiency and improve the quality of the final product.

[0160] The liquid cooling medium provided by the present invention adds a non-ionic surfactant to reduce surface tension, enhance the wettability and permeability of the liquid, help stabilize foam, reduce cavitation, and thus protect the pump and circulation system. The type and amount of the non-ionic surfactant added, as well as the specific addition steps, ensure sufficient mixing and improve thermal stability.

[0161] The liquid cooling medium provided by the present invention introduces nanometer-scale metal oxide particles and graphene nanosheets, and utilizes their high thermal conductivity to significantly improve the heat conduction capacity of the liquid cooling medium. The nanometer-scale particle size of these materials helps to stably disperse in the liquid and avoid sedimentation. The types, particle sizes, addition amounts of nanometer-scale metal oxide particles and graphene nanosheets, and their processing and addition steps, including plasma treatment and stirring time at a specific rotation speed, are used to ensure that the particles are evenly distributed and form an effective heat conduction network.

[0162] Phase change microcapsules are added to the liquid cooling medium provided by the present invention, and the characteristics of absorbing or releasing a large amount of heat during the phase change process are utilized to achieve temperature regulation and control. The encapsulation of the microcapsules prevents leakage of the phase change material and prolongs the service life of the liquid cooling medium. The composition, size, wall thickness, addition amount and specific addition steps of the phase change microcapsules ensure their uniform distribution.

[0163] The liquid cooling medium provided by the present invention is added with anti-corrosion agents, antibacterial agents, ultraviolet absorbers and antioxidants. Through the combined action of these additives, the long-term stability and performance protection of the liquid cooling medium are improved. The types, addition amounts and addition steps of various additives ensure that all additives are completely dissolved and dispersed.

[0164] The liquid cooling medium provided by the present invention adds a colorant to provide color for the liquid cooling medium, which is convenient for users to identify and detect leaks. The use of food-grade dyes ensures safety. The type of colorant, the amount of addition and the addition steps ensure that the colorant is completely dissolved and evenly colored.

[0165] The present invention also provides a liquid cooling device, comprising the above-mentioned liquid cooling medium.

[0166] The present invention also provides an electronic device, comprising a liquid cooling device.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid cooling medium, characterized in that: The invention comprises the following components in parts by weight: 60-80 parts of biodegradable freezing liquid, 5-10 parts of nonionic surfactant, 1-5 parts of nano-scale metal oxide particles, 0.1-1 parts of graphene nanosheets and 5-10 parts of phase change material microcapsules.

2. The liquid cooling medium according to claim 1, characterized in that: The liquid cooling medium comprises the following components in parts by weight: 60-65 parts of biodegradable freezing liquid, 5-6 parts of nonionic surfactant, 1-2 parts of nano-scale metal oxide particles, 0.1-0.3 parts of graphene nanosheets and 5-6 parts of phase change material microcapsules.

3. The liquid cooling medium according to claim 1 or 2, characterized in that: The phase change material microcapsule is a polymer microcapsule encapsulating a phase change material and a repair agent, wherein the phase change material is selected from one or more of paraffin, fatty acid, lipid compound and hydrated salt polymer; the repair agent is an epoxy resin or a silane compound; The phase change material microcapsule has a diameter of 1-10 μm and a wall thickness of 50-200 nm.

4. The liquid cooling medium according to claim 1 or 2, characterized in that: The biodegradable refrigerant is selected from one or more of propylene glycol and modified vegetable oil, and / or the nonionic surfactant is polyoxyethylene alkyl ether; The nano-scale metal oxide particles are selected from one or more of aluminum oxide and zinc oxide.

5. The liquid cooling medium according to claim 4, characterized in that: The particle size of the nano-scale metal oxide particles is 5-50 nm; and / or the nano-scale metal oxide particles are pre-plasma treated.

6. The liquid cooling medium according to claim 1 or 2, characterized in that: The graphene nanosheet has 1 to 5 layers and a lateral size of 0.5 to 5 μm.

7. The liquid cooling medium according to claim 1 or 2, characterized in that: Also includes: 0.5-8 parts of auxiliary agent; the auxiliary agent is selected from one or more of anti-corrosion agent, antibacterial agent, ultraviolet absorber, antioxidant and colorant.

8. The liquid cooling medium according to claim 7, characterized in that: In parts by weight, the liquid cooling medium includes: 60-80 parts of biodegradable refrigerant, 5-10 parts of non-ionic surfactant, 1-5 parts of nano-scale metal oxide particles, 0.1-1 parts of graphene nanosheets, 5-10 parts of phase change material microcapsules, 0.5-2 parts of corrosion inhibitors, 0.1-1 parts of antibacterial agents, 0.2-2 parts of ultraviolet absorbers, 0.1-1 parts of antioxidants, and 0.01-0.1 parts of colorants.

9. The liquid cooling medium according to claim 8, characterized in that: The anticorrosive agent is benzotriazole; and / or, The antibacterial agent is isothiazolinone; and / or, The ultraviolet absorber is a benzophenone compound; and / or, The antioxidant is vitamin E; and / or, The colorant is a food grade dye.

10. A method for preparing a liquid cooling medium according to any one of claims 1 to 9, characterized in that: The following steps are involved: After preheating the biodegradable freezing liquid to 40-60° C., a nonionic surfactant, nano-sized metal oxide particles, graphene nanosheets, phase change material microcapsules and an auxiliary agent are sequentially added to obtain a mixture; The mixture is subjected to ultrasonic treatment and microfiltration to remove impurities, and then dried using supercritical fluid technology.

Images