Data center cooling liquid

Abstract

The invention discloses a cooling liquid for a data center. The cooling liquid is prepared from the following components in percentage by mass: 0.03 to 0.06 weight percent of corrosion inhibitor, 0.01 to 0.05 weight percent of bacteriostatic agent, 25 to 30 weight percent of antifreezing agent, 0.01 to 0.02 weight percent of organic alkali, 0.0001 to 0.001 weight percent of defoaming agent, 0.0001 to 0.001 weight percent of pigment and the balance of water. Through the synergistic effect of the nonionic corrosion inhibitor and the bacteriostatic agent which are compounded from three components, the corrosion inhibition performance of the cooling liquid is remarkably enhanced while efficient bacteriostasis is achieved, and the cooling liquid is good in compatibility with metal materials and non-metal materials, low in conductivity and excellent in reserve alkalinity and hard water resistance.

Description

Technical Field

[0001] This invention relates to a coolant, and more particularly to a data center coolant. Background Technology

[0002] With the advent of the era of artificial intelligence and big data, the power consumption of data centers is constantly increasing, and the enormous heat generated poses a severe challenge to data center heat dissipation. Liquid cooling technology, as a highly efficient and energy-saving heat dissipation solution, is rapidly emerging and showing broad application prospects in high-density computing environments.

[0003] Cold plate liquid cooling and immersion liquid cooling are the two mainstream liquid cooling technologies currently available. Cold plate liquid cooling is a non-contact cooling method. Its principle is to place high-heat-generating components such as the CPU and GPU in close contact with a liquid cooling plate (usually a closed cavity made of thermally conductive metals such as copper or aluminum), and the heat is indirectly removed by the internal flowing coolant. Immersion liquid cooling, on the other hand, is a direct contact cooling method. The entire server or its main heat-generating components are immersed in an insulating coolant, utilizing the liquid's high thermal conductivity and potential phase change processes to directly absorb and remove heat from all components. Comparatively, cold plate liquid cooling requires less modification to server chip components and auxiliary parts, making it a widely used and mature solution.

[0004] Currently, cold plate liquid cooling systems commonly use water or ethylene glycol aqueous solutions as coolants. While these solutions have high specific heat capacities, they offer poor corrosion inhibition for liquid cooling plate materials such as copper and aluminum, easily leading to metal corrosion over long-term operation and increasing maintenance and replacement costs. Furthermore, if no bactericide is added to the coolant, bacteria can easily grow inside the pipes, affecting the system's heat dissipation efficiency. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a cold plate type data center coolant with excellent corrosion inhibition performance and efficient sterilization.

[0006] Technical solution: The data center coolant of the present invention comprises the following components by mass percentage: corrosion inhibitor 0.03~0.06wt%, antibacterial agent 0.01~0.05wt%, antifreeze agent 25~30wt%, organic alkali 0.01~0.02wt%, defoamer 0.0001~0.001wt%, pigment 0.0001~0.001wt%, and the balance being water.

[0007] The corrosion inhibitor is a three-component compound consisting of a bissilane coupling agent, a triazole, and a long-chain dicarboxylic acid. The mass percentage of the bissilane coupling agent in the coolant is 0.010~0.020 wt%, the mass percentage of the triazole in the coolant is 0.015~0.030 wt%, and the mass percentage of the long-chain dicarboxylic acid in the coolant is 0.005~0.010 wt%.

[0008] Preferably, the corrosion inhibitor is a compound of three components: a bissilane coupling agent, a triazole, and a long-chain dicarboxylic acid, in a mass ratio of 2:3:1.

[0009] Furthermore, the bissilane coupling agent includes at least one of 1,2-bistrimethoxysilyl ethane (BTMSE) and 1,2-bistriethoxysilyl ethane (BTSE) for forming a dense hydrophobic protective film on the metal surface to delay metal corrosion.

[0010] Furthermore, the triazole includes at least one of benzotriazole and methylbenzotriazole, the nitrogen atom in which can combine with -SiOH generated by the hydrolysis of the bissilane coupling agent to form a coordination bond on the metal surface, thereby enhancing the adsorption strength between the protective film and the metal.

[0011] Furthermore, the long-chain dicarboxylic acid is HOOC-(CH2)n-COOH, n=10~18, and the -OH in its molecule can be adsorbed on the metal surface. At the same time, the long chain can enhance the hydrophobic properties of the protective film.

[0012] The antibacterial agent is a natural essential oil.

[0013] Furthermore, the natural essential oil includes at least one of lavender essential oil, tea tree essential oil, and clove essential oil. The molecules of its components are rich in oxygen atoms and unsaturated bonds, which can effectively inhibit bacteria while adsorbing onto the metal surface to form an insoluble complex hydrophobic film layer and being compatible with long-chain dicarboxylic acids, further enhancing the corrosion inhibition performance of the coolant.

[0014] The antifreeze agent includes at least one of ethylene glycol and 1,2-propanediol. Preferably, the ethylene glycol is polyester grade ethylene glycol conforming to GB / T 4649-2018 standard, and the 1,2-propanediol meets the superior grade requirements of HG / T 5392-2018 standard.

[0015] The organic base includes at least one of monoethanolamine, diethanolamine, and triethanolamine, and is used to adjust the pH of the coolant.

[0016] The defoamer is a polyether-type defoamer, and the pigment is fluorescent yellow. Preferably, the polyether-type defoamer is a copolymer of ethylene oxide and propylene oxide (GPE) type polyether with a molecular weight of 3000.

[0017] Preferably, the water is ultrapure water, and more preferably ultrapure water prepared by a multi-stage OR reverse osmosis system with EDI filtration, with a conductivity of <1 μs / cm.

[0018] The data center coolant of the present invention is prepared according to the following steps:

[0019] (1) Weigh out the corresponding mass percentages of antifreeze and water, stir at 25~35℃ to obtain a uniform solvent;

[0020] (2) Add the corresponding mass percentages of bissilane coupling agent, organic base and long-chain dicarboxylic acid to the above homogeneous solvent respectively, and continue stirring at 25~35℃ to fully dissolve them and obtain a homogeneous solution;

[0021] (3) Add the corresponding mass percentages of triazole and antibacterial agent to the above homogeneous solution respectively, stir at 50~60℃ to dissolve them completely, and then stop heating;

[0022] (4) After the above mixed solution is cooled to 25~35℃, add the corresponding mass percentage of defoamer and pigment to it, stir to make it evenly dissolved, and obtain the coolant.

[0023] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: Through the synergistic effect of the three-component compound nonionic corrosion inhibitor and antibacterial agent, it can significantly enhance the corrosion inhibition performance of the coolant while effectively inhibiting bacteria. It has good compatibility with metal and non-metal materials, low electrical conductivity, and excellent reserve alkalinity and hard water resistance. Detailed Implementation

[0024] The technical solution of the present invention will be further described below with reference to the embodiments. Unless otherwise stated, all reagents used are commercially available and are used directly without purification.

[0025] Examples 1-10

[0026] The coolant in this embodiment contains components as shown in Table 1 by mass percentage, with the balance being ultrapure water.

[0027] The coolant is prepared according to the following steps:

[0028] (1) Weigh out the corresponding mass percentages of antifreeze and water, and stir at 50 r / min for 10 min at 25~35℃ to obtain a uniform solvent;

[0029] (2) Add the corresponding mass percentage of bissilane coupling agent, organic base and long-chain dicarboxylic acid to the above homogeneous solvent respectively, and continue stirring at 50 r / min at 25~35℃. Stir for 30 min after each addition of a component to ensure complete dissolution and obtain a homogeneous solution.

[0030] (3) Add the corresponding mass percentages of triazole and antibacterial agent to the above homogeneous solution respectively, stir at 50~60℃ at a speed of 50 r / min, stir for 20 min after each addition of a component to ensure complete dissolution, and obtain a mixed solution. Then stop heating.

[0031] (4) Under the stirring condition of 50 r / min, after the above mixed solution is cooled to 25~35℃, add the corresponding mass percentage of defoamer and pigment respectively, and continue stirring for 30 min to make it uniformly dissolved to obtain the cooling liquid.

[0032] Table 1 Coolant Component Distribution Ratio in Examples

[0033] Comparative Examples 1-14

[0034] Comparative Examples 1-14 were prepared using the same method as Examples 1-10, except that the components were different, as detailed in Table 2.

[0035] Table 2 Comparative Coolant Component Distribution Ratio

[0036] Note: " / " in the table indicates that the item does not exist.

[0037] The following tests were performed on Examples 1-10 and Comparative Examples 1-14, and the test results are shown in Tables 3 and 4:

[0038] 1. Freezing point determination: The freezing point shall be determined using an freezing point apparatus in accordance with standard SH / T 0090;

[0039] 2. pH value determination: pH value shall be determined using a pH meter in accordance with standard SH / T 0069;

[0040] 3. Determination of reserve alkalinity: The reserve alkalinity shall be determined by titration according to standard SH / T 0091;

[0041] 4. Conductivity Measurement: Conductivity was measured using a conductivity meter in accordance with standard GB / T6908.

[0042] 5. Corrosion test of glassware at 672 h: The test shall be conducted at 80℃ in accordance with standard SH / T 0085;

[0043] 6. 1000 h compatibility test of ethylene propylene diene monomer (EPDM) rubber: The test was conducted at 80℃ according to standard GB / T 1690.

[0044] 7. 1000-hour silicone rubber compatibility performance test: The test shall be conducted at 80℃ in accordance with standard GB / T 1690;

[0045] 8. 1000 h PA66 compatibility performance test: The test was conducted at 80℃ according to standard GB / T 1690;

[0046] 9. 1000 h PA12 compatibility performance test: The test shall be conducted at 80℃ in accordance with standard GB / T 1690;

[0047] 10. 336-hour hard water resistance stability test: The test was conducted at 90℃±2℃ according to Appendix D of standard GB 29743.1.

[0048] 11. 48-hour bacterial inhibition test: The test was conducted at 25℃±2℃ according to standard QB / T2738.

[0049] Table 3. Coolant performance test results of the examples

[0050] Note: In the table, "+" indicates an increase in sample weight loss, and "-" indicates a decrease in sample weight loss.

[0051] Table 4 Comparative Coolant Performance Test Results

[0052] Note: In the table, "+" indicates an increase in sample weight loss, and "-" indicates a decrease in sample weight loss.

[0053] As shown in Examples 1-10, the coolant of the present invention exhibits significant corrosion inhibition effects on H59 brass, 6061 aluminum alloy, T2 pure copper, S30408 ​​stainless steel, and BAg72 Cu780 solder. It also demonstrates good compatibility with non-metallic materials, low conductivity, excellent reserve alkalinity and hard water resistance, and effectively inhibits the growth of bacteria and fungi. In contrast, the comparative coolant shows poor corrosion inhibition performance on metals. Comparing Examples 1, 7-8, and Comparative Examples 10-11, it is evident that within a certain range, the corrosion inhibition performance of the coolant on metals increases with the increase of the corrosion inhibitor content. The best corrosion inhibition performance is achieved when the corrosion inhibitor is a compound of bissilane coupling agent, triazole, and long-chain dicarboxylic acid in a mass ratio of 2:3:1. This results in the most significant corrosion inhibition effect on H59 brass, 6061 aluminum alloy, T2 pure copper, S30408 ​​stainless steel, and BAg72 Cu780 solder, and it also exhibits good compatibility with non-metallic materials.

[0054] Comparing Example 1 with Comparative Examples 1-9, it can be seen that the excellent corrosion inhibition performance of the coolant of the present invention is due to the synergistic effect of the three-component compound corrosion inhibitor and antibacterial agent. The corrosion inhibitor of the present invention is a three-component compound of bissilane coupling agent, triazole, and long-chain dicarboxylic acid. The bissilane coupling agent hydrolyzes to generate -SiOH, which can react with aluminum atoms on the surface of aluminum metal substrate to form Al-O-Si bonds. The remaining -SiOH undergoes dehydration self-condensation to form Si-O-Si bonds, together forming a dense hydrophobic protective film on the aluminum metal surface. This film forms covalent bonds through adsorption, which can firmly bind to the substrate. In addition, the nitrogen atom in the triazole molecule can combine with the -SiOH generated by the hydrolysis of the bissilane coupling agent to form a coordination bond on the metal surface, enhancing the adsorption strength between the protective film and the metal. The -OH in the long-chain dicarboxylic acid molecule can be adsorbed on the metal surface, and the long chain can enhance the hydrophobicity of the protective film.

[0055] Comparing Example 1 with Comparative Example 12 using a monosilane coupling agent, it can be seen that the bissilane coupling agent has a better corrosion inhibition effect. This is because the bissilane coupling agent has two -SiOH groups, which allows the protective film to bond more firmly to the metal substrate. Comparing Example 1 with Comparative Examples 13-14, it can be seen that long-chain dicarboxylic acids provide more durable, stable, and comprehensive metal protection while exhibiting better compatibility with other non-metallic materials in the coolant system. The carboxyl groups (-COOH) at both ends of the long-chain organic acid molecule can undergo a strong chelation reaction with metal ions (such as ions on the surface of aluminum and iron), forming a dense, strong, and insoluble monomolecular protective film on the metal surface. This film acts as a barrier, effectively preventing corrosive media from contacting the metal substrate. This protective film is very stable and not easily washed away or destroyed. Therefore, it does not require a high concentration of free additives to maintain low consumption and long lifespan of the corrosion inhibitor, especially exhibiting excellent resistance to cavitation corrosion and pitting corrosion in aluminum alloys. The short-chain organic acid used in Comparative Example 13 easily combines with hardness ions such as calcium and magnesium in water to form insoluble calcium / magnesium salts. These salts will deposit on the inner wall of the radiator and in the water channels, forming scale, which seriously affects the heat dissipation efficiency and results in failure to meet the hard water resistance stability requirements.

[0056] In summary, the above three-component compound achieves long-lasting metal protection while exhibiting excellent corrosion inhibition efficiency with minimal dosage. Furthermore, the three-component corrosion inhibitor is compounded with natural essential oils, which act as antibacterial agents. The natural essential oils are rich in oxygen atoms and unsaturated bonds, enabling them to effectively inhibit bacteria while adsorbing onto the metal surface to form insoluble complexes. These complexes are also compatible with long-chain dicarboxylic acids, further enhancing the protective film's effect on the metal and improving the corrosion inhibition performance of the coolant.

Claims

1. A data center coolant, characterized in that, It includes the following components by mass percentage: corrosion inhibitor 0.03~0.06wt%, antibacterial agent 0.01~0.05wt%, antifreeze agent 25~30wt%, organic alkali 0.01~0.02wt%, defoamer 0.0001~0.001wt%, pigment 0.0001~0.001wt%, and the balance is water.

2. The data center coolant according to claim 1, characterized in that, The corrosion inhibitor is a three-component compound consisting of a bissilane coupling agent, a triazole, and a long-chain dicarboxylic acid. The mass percentage of the bissilane coupling agent in the coolant is 0.010~0.020 wt%, the mass percentage of the triazole in the coolant is 0.015~0.030 wt%, and the mass percentage of the long-chain dicarboxylic acid in the coolant is 0.005~0.010 wt%.

3. The data center coolant according to claim 2, characterized in that, The bissilane coupling agent includes at least one of 1,2-bistrimethoxysilyl ethane and 1,2-bistriethoxysilyl ethane.

4. The data center coolant according to claim 2, characterized in that, The triazole includes at least one of benzotriazole and methylbenzotriazole.

5. The data center coolant according to claim 2, characterized in that, The long-chain dicarboxylic acid is HOOC-(CH2). n At least one of -COOH (n=10~18).

6. The data center coolant according to claim 1, characterized in that, The antibacterial agent is a natural essential oil.

7. The data center coolant according to claim 6, characterized in that, The natural essential oils include at least one of lavender essential oil, tea tree essential oil, and clove essential oil.

8. The data center coolant according to claim 1, characterized in that, The antifreeze includes at least one of ethylene glycol and 1,2-propanediol.

9. The data center coolant according to claim 1, characterized in that, The organic base includes at least one of monoethanolamine, diethanolamine, and triethanolamine.

10. The data center coolant according to claim 1, characterized in that, The defoamer is a polyether-type defoamer, and the pigment is fluorescent yellow.

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