A method for preparing single-phase immersion insulating coolant

Abstract

The present invention provides a method for preparing a single-phase immersion insulating coolant, particularly for use in high-density liquid-cooled cabinets, effectively improving the cooling effect at high temperatures. To this end, the present invention includes preparing the coolant by mixing hydrogenated white oil, electronic fluorinated liquid, and other ingredients in a first reactor, and finally filtering out impurities precipitated after a high-frequency ultrasonic bath. After adopting the above technical solution, a new set of mixing ratios is first adopted through the method described in the present invention, and the improved processing technology significantly improves the performance of the coolant.

Description

Technical Field

[0001] The present invention relates to the technical field of coolants, and in particular to a method for preparing a single-phase immersion insulating coolant. Background Art

[0002] In recent years, the continuous advancement of technologies such as artificial intelligence, cloud computing, the Internet of Things, and blockchain has placed increasingly stringent demands on the performance and integration of electronic information equipment. The resulting high heat density and enormous energy consumption have also posed significant challenges to data center cooling technology. The heat generated during data center operation can affect the operating environment of the corresponding equipment, reducing efficiency and shortening its lifespan. Consequently, various cooling methods are being employed. Immersion liquid cooling is a typical direct-contact liquid cooling method. Electronic equipment is immersed in a coolant, and the generated heat is directly transferred to the coolant, where it is circulated for heat conduction. Because the entire device is submerged in the coolant, immersion liquid cooling offers high heat transfer efficiency, balancing energy savings with high efficiency.

[0003] Although various types of coolants are available in the existing technology, after many attempts, most of the coolants in the existing technology can only ensure sufficient thermal conductivity. However, after a period of use, the cooling effect decreases as the overall temperature of the coolant rises. More importantly, for liquid-cooled cabinets filled with supercomputer servers, the internal equipment is very close together. As a result, the contact area between the main heat source and the coolant is not large. After the temperature of this part rises rapidly, it cannot be transferred in time, resulting in the cooling effect not meeting the expected level. Increasing the distance between devices can effectively improve the cooling effect, but the number of devices that can be configured in a liquid-cooled cabinet will be reduced. Summary of the Invention

[0004] The present invention provides a method for preparing a single-phase immersion insulating coolant, specifically for use in high-density liquid-cooled cabinets, effectively improving the cooling effect at high temperatures. This significantly reduces the spacing between devices within the cabinet, improving space utilization.

[0005] To this end, a method for preparing a single-phase immersion insulating coolant comprises:

[0006] Step 1: Add 100 parts of into the first reactor, adjust the initial temperature of the reactor to 40 degrees Celsius, stir continuously at a speed of 120 r / min and start timing;

[0007] Step 2: Prepare the treatment liquid in the second reactor by taking 30 parts of electronic fluorination liquid, adding 1 part of polydimethylsiloxane and 0.5 parts of benzotriazole, stirring at 30 r / min for 10 minutes under hydrogenated white oil at room temperature, and then letting it stand for at least 10 minutes;

[0008] Step 3: After stirring in the first reactor for at least 15 minutes, the temperature of the first reactor is raised to 60 degrees Celsius, stirring is stopped, and the liquid in the second reactor that has been left to stand is completely poured into the first reactor;

[0009] Step 4: After step 3, stirring was resumed at 60 r / min and the temperature was further increased to 80 degrees Celsius. 0.05 parts of di-tert-butyl-p-methylphenol were added during the stirring process and the stirring process was continued for 20 minutes.

[0010] Step 5: After stirring, let the liquid stand and stop heating;

[0011] Step 6: After the solution cools down to room temperature, it is taken out of the reactor and subjected to a high-frequency ultrasonic bath at a frequency of 200KHz-400KHz for 5 minutes;

[0012] Step 7: Filter out the impurities precipitated after the high-frequency ultrasonic bath, and the coolant preparation is complete.

[0013] Preferably, before large-scale production, a unit amount of the formulation is sampled and processed. The mass and composition of the final precipitated impurities are recorded, and their proportion to the initial formulation is calculated. During formal production, the precipitated impurities are measured. When the precipitated impurities reach the expected proportion, high-frequency ultrasonic bathing is completed. If not, step 6 is repeated. Due to the small sample size, the precipitation ratio is easy to grasp and relatively stable. Samples are taken from each batch as a reference to ensure that the precipitation ratio during actual operation reaches the expected proportion, which is the only way to ensure the final coolant performance.

[0014] Preferably, the mass of hydrogenated white oil initially added to a single reactor does not exceed 100 liters, otherwise it will be difficult to ensure sufficient reaction in the later stages.

[0015] Preferably, the electronic fluorination liquid in step 2 is Zines HF-110, Zines HF-150 or Zines HF-170. Different electronic fluorination liquids only have different boiling points, and the one to be selected can be selected according to the actual situation.

[0016] Preferably, after the addition of di-tert-butyl-p-methylphenol in step 4 is completed, the stirring speed is increased to 120 r / min.

[0017] Preferably, in step 6, when the room temperature exceeds 20 degrees Celsius, it is cooled to 20 degrees Celsius.

[0018] Preferably, the stirrer used in the reactor is a ribbon stirrer. This is because the reactor is usually heated from the bottom, where the molecules are more active and will generate longitudinal circulation. The ribbon stirrer can provide an inclined stirring action, which allows for more complete mixing of the components in the coolant.

[0019] Preferably, the configured insulating coolant is injected into the single-phase immersion liquid cooling cabinet for normal use.

[0020] Preferably, the prepared coolant is used within 4 hours, otherwise it needs to be stored in a vacuum to prevent impurities from entering the coolant after being left in the air for a long time and affecting the coolant's performance.

[0021] By adopting the above technical solution, the present invention differs from the existing technology and is more refined during the processing. Most coolant formulas are derived through sample experiments. However, during large-scale production, the origin and quality of raw materials purchased vary. Often, trace impurities in the raw materials lead to a decrease in overall performance. Furthermore, the various components of the coolant are not completely compatible and require processing during the processing to improve their mutual integration.

[0022] The method described in the present invention first adopts a new set of ratios and an improved processing technology, which significantly improves the use effect of the coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0024] Figure 1 The following is a performance parameter table of the single-phase immersion insulating coolant prepared by the present invention.

[0025] Figure 2 The main performance parameters of the single-phase immersion insulating coolant prepared by the present invention are compared with similar products. DETAILED DESCRIPTION

[0026] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0027] First, it's important to note that products marketed as "coolants" fall into two categories. One category, as described in the present invention, involves removing heat from heat-generating devices through heat exchange. These fluids typically exhibit excellent heat exchange performance and high fluidity. The other category, used in automobiles and other equipment, is essentially antifreeze, a liquid used to prevent freezing. These "coolants" typically use relatively inert liquids as raw materials and are often viscous and lack fluidity. While these two products share the same name, their functions differ significantly.

[0028] The hydrogenated white oil described in the present invention is a white oil product whose quality has been improved through hydrogenation. It is a mixed hydrocarbon solvent obtained by catalytic hydrogenation and refining from petroleum. Its main components are saturated hydrocarbons with carbon numbers ranging from C15 to C20. This product is commercially available.

[0029] Compared to regular white oil, hydrogenated white oil is clearer and more transparent. Regular white oil has a slightly yellowish hue due to impurities such as aromatic hydrocarbons. Hydrogenation removes most of these impurities, leaving the product transparent and colorless. It also offers more stable properties. Hydrogenation reduces double bonds and ring structures in hydrocarbons, producing more stable straight-chain and branched hydrocarbons. This improves the oxidation and polymerization resistance of hydrogenated white oil, extending its service life. It also exhibits lower volatility. Saturated hydrocarbons have a higher boiling point, resulting in less volatile losses from hydrogenated white oil, making it more economical to use. The resulting product from hydrogenation is less irritating and safer to use.

[0030] Hydrogenated white oil is currently widely used in various precision instruments, electrical equipment, and household products, such as transfer paper, carbon ribbons, lubricants, disinfectants, and pharmaceutical solvents. Compared to conventional white oil, hydrogenated white oil offers a wider operating temperature range, greater durability, and improved safety, making it a higher-quality petrochemical solvent product.

[0031] However, hydrogenated white oil is rarely used as a coolant in existing technologies. This is because its primary components are long-chain C15-C20 alkanes, which have a high boiling point and low thermal conductivity. A major issue is the high production cost of hydrogenated white oil, making its use as a dedicated coolant prohibitively expensive and uneconomical.

[0032] However, in the usage scenario of the present invention, the disadvantage of the high production cost of hydrogenated white oil is not significant for equipment worth nearly 10 million yuan in a liquid-cooled cabinet filled with supercomputer servers.

[0033] On this basis, the present invention provides a method for preparing a single-phase immersion insulating coolant, comprising:

[0034] Step 1: Add 100 parts of hydrogenated white oil to the first reactor. Adjust the initial reactor temperature to 40°C, stir continuously at 120 rpm, and start the timer. The agitator used in the reactor is a ribbon agitator. Because reactors are typically heated from the bottom, the higher molecular activity at the bottom will generate longitudinal circulation. The ribbon agitator provides an inclined stirring action, ensuring more thorough mixing of the components in the coolant.

[0035] Step 2: Prepare the treatment solution in a second reactor. Take 30 parts of the electronic fluoride solution, add 1 part of polydimethylsiloxane and 0.5 parts of benzotriazole, stir at 30 rpm at room temperature for 10 minutes, and then let it sit for at least 10 minutes. Polydimethylsiloxane serves as a defoaming agent, and benzotriazole serves as a rust inhibitor. This process ensures that these two added ingredients are thoroughly mixed with the electronic fluoride solution. It should be noted that the three raw materials are not completely miscible in the second reactor.

[0036] Step 3: After stirring in the first reactor for at least 15 minutes, the temperature of the first reactor is raised to 60 degrees Celsius, stirring is stopped, and the liquid in the second reactor that has been left to stand is completely poured into the first reactor;

[0037] Step 4: After step 3, stirring is resumed at 60 r / min and the temperature is further increased to 80 degrees Celsius. During this stirring process, 0.05 parts of di-tert-butyl-p-methylphenol are added, and the stirring process is continued for 20 minutes. After the addition of di-tert-butyl-p-methylphenol, the stirring speed is increased to 120 r / min. In addition to its antioxidant function, di-tert-butyl-p-methylphenol also acts as a catalyst in this step, increasing the solubility of the various components. The stirring frequency is then increased to ensure that the various components are fully dissolved.

[0038] Step 5: After stirring, let the liquid stand and stop heating;

[0039] Step 6: When the solution cools down to room temperature, remove it from the reactor and perform a high-frequency ultrasonic bath at a frequency of 200KHz-400KHz for 5 minutes; however, if the room temperature exceeds 20 degrees Celsius, cool it down to 20 degrees Celsius.

[0040] Step 7: Filter out impurities precipitated after the high-frequency ultrasonic bath. The coolant is now ready. Those skilled in the art will recognize that hydrogenated white oil is not fully miscible with most common coolants. Mixing can lead to stratification or precipitation, impacting cooling system operation. This limits the use of hydrogenated white oil as a coolant. However, the present invention utilizes high-frequency ultrasonic bathing to pre-filter impurities, minimizing the occurrence of stratification or precipitation during operation.

[0041] From the technical solution of the present invention, it can be seen that the present invention protects a very fixed ratio, in which the selection and proportion of the antioxidant (di-tert-butyl-p-methylphenol), defoaming agent (polydimethylsiloxane), and rust inhibitor (benzotriazole) are fixed. Figure 1 As shown, with this ratio of ingredients, the specific heat capacity of the final product of the present invention can reach 2700 J / (kg·K). However, with a slight change in the ratio, it is difficult to achieve a specific heat capacity of 2550 J / (kg·K). It is preliminarily judged that this technical solution can fully mix the various ingredients and remove impurities.

[0042] The mass of hydrogenated white oil initially added to a single reactor should not exceed 100 liters. Otherwise, it will be difficult to ensure sufficient reaction in the later stages. However, due to the high reaction precision requirements of the present invention, an overly large container will result in uneven heating or stirring during processing. The electronic fluorination liquid is Zines HF-110, Zines HF-150, or Zines HF-170. Different electronic fluorination liquids differ only in boiling point; the choice can be made based on actual conditions. The addition of electronic fluorination liquid achieves stable temperature control, maximizing the lifespan of electronic components in servers.

[0043] Finally, inject the configured insulating coolant into the single-phase immersion liquid cooling cabinet and it can be used normally. After testing, the PUE of the liquid cooling cabinet using the embodiment of the present invention is between 1.15-1.05. PUE is the abbreviation of Power Usage Effectiveness, which is the ratio of all energy consumed by the data center to the energy consumed by the IT load. It is one of the most basic and effective indicators for evaluating the energy efficiency of the data center. Figure 2 As shown, the coolant prepared by the present invention has significantly improved performance compared to other conventional coolants currently available on the market. Under the same circumstances, in a single-phase immersion cooling cabinet, after the coolant has been used for 3 hours, the coolant temperature near the main equipment will rise to about 47 degrees Celsius, and for equipment with large computing power, it may even rise to 50 degrees Celsius. The product prepared by the present invention can control the temperature below 42 degrees Celsius. After 24 hours of continuous operation, the temperature of the liquid will not exceed 45 degrees Celsius. However, it should be noted that the prepared coolant must be used within 4 hours, otherwise it needs to be vacuum preserved. This is to avoid the coolant from stratifying again after being left in the air for a long time, or impurities entering the coolant and affecting the use effect of the coolant.

[0044] To ensure that the product can achieve the expected effect, before large-scale production, take a unit amount of the proportioning ingredients for operation, record the mass and composition of the final precipitated impurities, and calculate their proportion to the initial proportioning ingredients. During formal production, the precipitated impurities are measured. When the precipitated impurities reach the expected proportion, the high-frequency ultrasonic bath is completed. If it fails to reach the expected proportion, repeat step 6. Due to the small sample size, the precipitation ratio is easy to grasp and relatively stable. Take samples from each batch as a reference to ensure that the precipitation ratio in the actual operation process meets the expected level, so as to ensure the final coolant use effect. If after repeating step 6 three times, the precipitation ratio still cannot reach 80% of the reference precipitation value, the configuration is declared a failure and the coolant group is reduced in grade for use.

[0045] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the scope of implementation of the present invention. Any person of ordinary skill in the art can make some improvements without departing from the scope of the invention of the present invention, that is, all equivalent improvements made in accordance with the present invention should be covered by the scope of the present invention. In the description of this specification, the description of the reference terms "one embodiment / method", "some embodiments / methods", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples without contradicting each other.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0047] Those skilled in the art will appreciate that the above embodiments are merely intended to clearly illustrate the present disclosure and are not intended to limit the scope of the present disclosure. Other changes or modifications may be made based on the above disclosure, and such changes or modifications are still within the scope of the present disclosure.

Claims

1. A method for preparing a single-phase immersion insulating coolant, characterized in that: include: Step 1: Add 100 parts of hydrogenated white oil to the first reactor, adjust the initial temperature of the reactor to 40 degrees Celsius, stir continuously at a speed of 120 r / min and start timing; Step 2: Prepare the treatment liquid in the second reaction kettle by taking 30 parts of electronic fluorination liquid, adding 1 part of polydimethylsiloxane and 0.5 parts of benzotriazole, stirring at 30 r / min at room temperature for 10 minutes, and then letting it stand for at least 10 minutes; Step 3: After stirring in the first reactor for at least 15 minutes, the temperature of the first reactor is raised to 60 degrees Celsius, stirring is stopped, and the liquid in the second reactor that has been left to stand is completely poured into the first reactor; Step 4: After step 3, stirring was resumed at 60 r / min and the temperature was further increased to 80 degrees Celsius. 0.05 parts of di-tert-butyl-p-methylphenol were added during the stirring process and the stirring process was continued for 20 minutes. Step 5: After stirring, let the liquid stand and stop heating; Step 6: After the solution cools down to room temperature, it is taken out of the reactor and subjected to a high-frequency ultrasonic bath at a frequency of 200KHz-400KHz for 5 minutes; Step 7: Filter out the impurities precipitated after the high-frequency ultrasonic bath, and the coolant preparation is complete. Before large-scale production, take a unit amount of the proportioning components and operate, and record the mass and composition of the final precipitated impurities, and calculate their proportion to the initial proportioning components. During formal production, measure the precipitated impurities. When the precipitated impurities reach the expected proportion, the high-frequency ultrasonic bath is completed. If not, repeat step 6.

2. The method for preparing a single-phase immersion insulating coolant according to claim 1, wherein: The mass of hydrogenated white oil initially added to a single reactor shall not exceed 100 liters.

3. The method for preparing a single-phase immersion insulating coolant according to claim 1, wherein: The electronic fluorination liquid described in step 2 is Zines HF-110, Zines HF-150 or Zines HF-170.

4. The method for preparing a single-phase immersion insulating coolant according to claim 1, wherein: After the addition of di-tert-butyl-p-methylphenol in step 4 is completed, the stirring speed is increased to 120 r / min.

5. The method for preparing a single-phase immersion insulating coolant according to claim 1, wherein: In step 6, when the room temperature exceeds 20 degrees Celsius, it is cooled to 20 degrees Celsius.

6. A method for preparing a single-phase immersion insulating coolant according to any one of claims 1 to 5, characterized in that: The agitator used in the reactor is a ribbon agitator.

7. A method for preparing and using a single-phase immersion insulating coolant, characterized in that: The insulating coolant configured by the method according to any one of claims 1 to 6 is injected into a single-phase immersion liquid cooling cabinet.

8. The method for preparing and using a single-phase immersion insulating coolant according to claim 7, characterized in that: The prepared coolant should be used within 4 hours, otherwise it needs to be stored in a vacuum.

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