Cooling liquid and application thereof

Abstract

The invention discloses a cooling liquid and application thereof. According to the cooling liquid, the amino acid condensed aromatic aldehyde Schiff base, the nitrogen heterocyclic quaternary ammonium salt, the organic base and the environment-friendly anti-freezing agent are combined for use, so that the cooling liquid has long-acting anti-corrosion, anti-scaling and anti-bacterial effects, also has good non-metal compatibility, electrical safety and green and environment-friendly properties, and is particularly suitable for a data center cooling system.

Description

Technical Field

[0001] The invention relates to a cooling liquid and application thereof, in particular to a cooling liquid with long-lasting corrosion inhibition, antibacterial and antiscaling properties and application thereof. Background Art

[0002] With the rapid development of data center technologies such as artificial intelligence, cloud computing, and big data, how to effectively reduce the energy consumption of data centers is an urgent problem to be solved. At present, non-contact plate liquid cooling is the main cooling method for data centers. Since electronic devices in data centers have a high heat flux density and very strict heat dissipation requirements, the ideal data center plate coolant needs to be able to inhibit the corrosion of copper, aluminum, and stainless steel cold plates for a long time; have a long service life and be maintenance-free throughout the entire cycle; have good compatibility with non-metallic parts, and be able to avoid water pump leakage and interface rubber corrosion; have bactericidal and scale-inhibiting properties to avoid scaling and bacterial growth in data centers; be able to prevent circuit failures and have low conductivity; be environmentally friendly and have no biological toxicity or environmental hazards.

[0003] CN114989791 discloses a hybrid organic antifreeze for automobiles, which uses organic acid to make the antifreeze have a high conductivity, and only has a corrosion inhibition effect on metal materials such as solder, 3003 aluminum, and 4043 aluminum, and is not suitable for data center cold plates. In addition, CN116913397 discloses a green corrosion inhibitor system with a core-shell structure, which only has a corrosion inhibition effect on metal materials such as copper, brass, 3003 aluminum, and 4043 aluminum in an acidic environment, but the use of organic acid still makes the antifreeze have a high conductivity, and is not suitable for data center cold plates. Summary of the invention

[0004] Purpose of the invention: The present invention aims to provide a cooling liquid suitable for a data center liquid cooling system and its application.

[0005] Technical solution: The coolant described in the present invention comprises amino acid acetal Schiff base, nitrogen-containing heterocyclic quaternary ammonium salt, C2-C4 alkyl alcohol amine, C3 diol, defoamer, pigment and water, wherein the mass ratio of amino acid acetal Schiff base to nitrogen-containing heterocyclic quaternary ammonium salt is 2:1-200:1.

[0006] In the coolant designed by the present invention, amino acid acetal aromatic aldehyde Schiff base and nitrogen-containing heterocyclic quaternary ammonium salt constitute a composite self-assembled corrosion-resistant film. The corrosion-resistant film uses an adsorption corrosion inhibition mechanism, and the consumption of corrosion inhibitors is low during use. It can exert long-term corrosion inhibition, antibacterial and scale inhibition effects on metal materials such as copper, aluminum and steel, and has good compatibility with non-metallic EPDM.

[0007] At the same time, using C2-C4 alkyl alcohol amine as an additive reduces the conductivity of the coolant to meet the electrical safety requirements of the data center. In addition, the use of environmentally friendly antifreeze ingredients also reduces the biological toxicity and environmental hazards of the coolant.

[0008] Preferably, the mass ratio of the amino acid aromatic aldehyde Schiff base to the nitrogen-containing heterocyclic quaternary ammonium salt is 20:1.

[0009] Preferably, the coolant of the present invention comprises, by mass fraction, 0.02% to 0.2% of amino acid aromatic aldehyde Schiff base, 0.001% to 0.01% of nitrogen-containing heterocyclic quaternary ammonium salt, 0.1% to 1% of C2 to C4 alkyl alcohol amine, 25% to 45% of C3 diol, 0.0001% to 0.001% of defoaming agent, 0.0001% to 0.001% of pigment and the balance of water.

[0010] Preferably, the coolant of the present invention comprises, by mass fraction, 0.2% of amino acid aromatic aldehyde Schiff base, 0.01% of nitrogen-containing heterocyclic quaternary ammonium salt, 1% of C2-C4 alkyl alcohol amine, 45% of C3 diol, 0.001% of defoamer, 0.001% of pigment and the balance of water;

[0011] Or it contains 0.1% of amino acid aromatic aldehyde Schiff base, 0.005% of nitrogen-containing heterocyclic quaternary ammonium salt, 0.8% of C2-C4 alkyl alcohol amine, 33% of C3 diol, 0.0005% of defoaming agent, 0.0001% of pigment and the balance of water;

[0012] Or it contains 0.02% of amino acid aromatic aldehyde Schiff base, 0.001% of nitrogen-containing heterocyclic quaternary ammonium salt, 0.1% of C2-C4 alkyl alcohol amine, 30% of C3 diol, 0.0001% of defoaming agent, 0.0005% of pigment and the balance of water;

[0013] Or it contains 0.02% of amino acid aromatic aldehyde Schiff base, 0.001% of nitrogen-containing heterocyclic quaternary ammonium salt, 0.1% of C2-C4 alkyl alcohol amine, 25% of C3 diol, 0.0008% of defoamer, 0.0003% of pigment and the balance of water.

[0014] Preferably, the amino acid aromatic aldehyde Schiff base is selected from one or both of L-lysine vanillin Schiff base and L-lysine anisaldehyde Schiff base.

[0015] More preferably, the amino acid aromatic aldehyde Schiff base is selected from L-lysine vanillin Schiff base or L-lysine anisaldehyde Schiff base.

[0016] Preferably, the nitrogen-containing heterocyclic quaternary ammonium salt is selected from at least one of dimethyl dodecyl pyridinium quaternary ammonium salt, dimethyl hexadecyl pyridinium quaternary ammonium salt, dimethyl dodecyl imidazole quaternary ammonium salt and dimethyl hexadecyl imidazole quaternary ammonium salt.

[0017] More preferably, the nitrogen-containing heterocyclic quaternary ammonium salt is selected from dimethyl dodecyl pyridinium quaternary ammonium salt, dimethyl hexadecyl pyridinium quaternary ammonium salt, dimethyl dodecyl imidazole quaternary ammonium salt or dimethyl hexadecyl imidazole quaternary ammonium salt.

[0018] More preferably, in the coolant of the present invention, the mass ratio of L-lysine vanillin Schiff base to dimethyl hexadecylpyridinium quaternary ammonium salt is 20:1;

[0019] Or the mass ratio of L-lysine vanillin Schiff base to dimethyl hexadecyl imidazole quaternary ammonium salt is 20:1;

[0020] or the mass ratio of L-lysine condensed vanillin Schiff base to dimethyl dodecyl imidazole quaternary ammonium salt is 20:1;

[0021] Alternatively, the mass ratio of L-lysine anisaldehyde Schiff base to dimethyl dodecylpyridinium quaternary ammonium salt is 20:1.

[0022] Preferably, the C2-C4 alkyl alcohol amine is selected from at least one of monoethanolamine, diethanolamine and triethanolamine.

[0023] Preferably, the C3 diol is selected from one or both of 1,2-propylene glycol and 1,3-propylene glycol.

[0024] Preferably, the defoamer is selected from ethylene oxide-propylene oxide copolymer GPE type polyether.

[0025] More preferably, the defoaming agent is selected from ethylene oxide-propylene oxide copolymer GPE type polyether with a molecular weight of 3000.

[0026] Preferably, the pigment is selected from azo dyes.

[0027] More preferably, the pigment is selected from Congo red.

[0028] Preferably, the coolant of the present invention comprises, by mass fraction, 0.2% of L-lysine vanillin Schiff base, 0.01% of dimethyl hexadecylpyridinium quaternary ammonium salt, 1% of triethanolamine, 45% of 1,2-propylene glycol, 0.001% of GPE type polyether with a molecular weight of 3000, 0.001% of Congo red and the balance of water;

[0029] Or it contains 0.1% of L-lysine vanillin Schiff base, 0.005% of dimethyl hexadecyl imidazole quaternary ammonium salt, 0.8% of diethanolamine, 33% of 1,2-propylene glycol, 0.0005% of GPE type polyether with a molecular weight of 3000, 0.0001% of Congo red and the balance of water;

[0030] Or comprising 0.02% of L-lysine condensed vanillin Schiff base, 0.001% of dimethyl dodecyl imidazole quaternary ammonium salt, 0.1% of monoethanolamine, 30% of 1,3-propylene glycol, 0.0001% of GPE type polyether with a molecular weight of 3000, 0.0005% of Congo red and the balance of water;

[0031] Alternatively, the composition comprises 0.02% of L-lysine anisaldehyde Schiff base, 0.001% of dimethyl dodecyl pyridinium quaternary ammonium salt, 0.1% of monoethanolamine, 25% of 1,3-propylene glycol, 0.0008% of GPE type polyether with a molecular weight of 3000, 0.0003% of Congo red and the balance of water.

[0032] The method for preparing the coolant of the present invention comprises the following steps:

[0033] (1) After mixing water and C2-C4 alkyl alcohol amine, amino acid acetal aromatic aldehyde Schiff base, nitrogen-containing heterocyclic quaternary ammonium salt, and part of C3 diol are added in sequence and mixed;

[0034] (2) The mixture obtained in step (1) is mixed with a defoaming agent pre-dissolved in a residual amount of C3 diol to obtain the cooling liquid.

[0035] Preferably, 90% of the total mass of C3 diol is added in step (1), and 10% of the total mass of C3 diol is added as pre-dissolved defoamer in step (2).

[0036] The cooling liquid of the present invention is applied in a liquid cooling system of a data center.

[0037] Preferably, the cooling liquid of the present invention is used in a non-contact plate-type data center liquid cooling system.

[0038] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0039] The coolant designed by the present invention is specially designed for the cooling system of the data center. By combining the amino acid acetal aromatic aldehyde Schiff base, the nitrogen-containing heterocyclic quaternary ammonium salt, the organic base and the environmentally friendly antifreeze, the coolant has a long-term anti-corrosion, anti-scaling and anti-bacterial effect on the liquid cooling system of the data center, and also has good non-metallic compatibility, electrical safety and green environmental protection. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described below in conjunction with embodiments.

[0041] Example 1

[0042] A special coolant for plate-type liquid cooling of a data center, composed as follows (mass percentage): 1,2-propylene glycol: 45.000%, triethanolamine: 1.000%; L-lysine vanillin Schiff base: 0.200%, dimethyl hexadecylpyridinium quaternary ammonium salt: 0.01%, GPE type polyether (molecular weight 3000): 0.001%, Congo red: 0.001%, pure water, the remainder.

[0043] Preparation method: Step 1: add pure water and organic base into the stirring kettle and start stirring; Step 2: add amino acid Schiff base and stir for 30±5 minutes; Step 3: add heterocyclic quaternary ammonium salt and stir for 30±5 minutes; Step 4: add 1,2-propylene glycol and stir for 30±5 minutes; Step 5: pre-dissolve the defoaming agent with 10 times the mass of 1,2-propylene glycol and add it into the stirring kettle and stir for 30±5 minutes.

[0044] Example 2

[0045] A special coolant for plate-type liquid cooling of a data center, the coolant composition is as follows (mass percentage): 1,2-propylene glycol: 33.000%, diethanolamine: 0.800%; L-lysine condensed vanillin Schiff base: 0.100%, dimethyl hexadecyl imidazole quaternary ammonium salt: 0.005%, GPE type polyether (molecular weight 3000): 0.0005%, Congo red: 0.0001%, pure water, balance.

[0046] Preparation method: Step 1: add pure water and organic base into the stirring kettle and start stirring; Step 2: add amino acid Schiff base and stir for 30±5 minutes; Step 3: add heterocyclic quaternary ammonium salt and stir for 30±5 minutes; Step 4: add 1,2-propylene glycol and stir for 30±5 minutes; Step 5: pre-dissolve the defoaming agent with 10 times the mass of 1,2-propylene glycol and add it into the stirring kettle and stir for 30±5 minutes.

[0047] Example 3

[0048] A special coolant for plate-type liquid cooling of a data center, the coolant composition is as follows (mass percentage): 1,3-propylene glycol: 30.000%, monoethanolamine: 0.100%; L-lysine condensed vanillin Schiff base: 0.020%, dimethyl dodecyl imidazole quaternary ammonium salt: 0.001%, GPE type polyether (molecular weight 3000): 0.0001%, Congo red: 0.0005%, pure water, balance.

[0049] Preparation method: Step 1: add pure water and organic base into the stirring kettle and start stirring; Step 2: add amino acid Schiff base and stir for 30±5 minutes; Step 3: add heterocyclic quaternary ammonium salt and stir for 30±5 minutes; Step 4: add 1,3-propylene glycol and stir for 30±5 minutes; Step 5: pre-dissolve the defoaming agent with 10 times the mass of 1,3-propylene glycol and add it into the stirring kettle and stir for 30±5 minutes.

[0050] Example 4

[0051] A special coolant for plate-type liquid cooling of a data center, the coolant composition is as follows (mass percentage): 1,2-propylene glycol: 25.000%, monoethanolamine: 0.100%; L-lysine anisaldehyde Schiff base: 0.020%, dimethyl dodecyl pyridinium quaternary ammonium salt: 0.001%, GPE type polyether (molecular weight 3000): 0.0008%, Congo red: 0.0003%, pure water, balance.

[0052] Preparation method: Step 1: add pure water and organic base into a stirring kettle and start stirring; Step 2: add amino acid Schiff base and stir for 30±5min; Step 3: add heterocyclic quaternary ammonium salt and stir for 30±5min; Step 4: add 1,3-propylene glycol and stir for 30±5min; Step 5: pre-dissolve the defoamer with 10 times the mass of 1,3-propylene glycol and add it into the stirring kettle and stir for 30±5min;

[0053] Example 5

[0054] The data center plate-type liquid cooling dedicated coolant of Examples 1 to 4 was tested for freezing point, conductivity, glassware corrosion, EPDM compatibility, hard water resistance stability, and total number of heterotrophic bacteria. The test methods and test results are shown in Table 1.

[0055] Table 1 Coolant performance test results

[0056]

[0057]

[0058] The relevant test performance of the coolant is summarized as follows:

[0059] Glassware test (88°C, 336h, SH / T 0085): Brass: ±2mg / piece; 3003 aluminum: ±2mg / piece; 6063 aluminum: ±2mg / piece; 304 stainless steel: ±2mg / piece.

[0060] EPDM compatibility (88℃, 1000h, GB / T 1690): Hardness change: ±5IRHD; Volume change rate: ±5%; Tensile strength at break change rate: ±15%; Elongation at break change rate: ±30%.

[0061] Hard water resistance (90℃±2℃, 336h±2h, Appendix D of GB 29743.1): No precipitation or suspended matter.

[0062] Total number of heterotrophic bacteria (HG / T4207): <1×10 5 CFU / mL.

[0063] Conductivity (GB 29743.2 Appendix A): ≤500μS / cm.

[0064] Total amount of gas produced by electrolysis (400V, 10min): ≤1mL.

[0065] As shown in Table 1, the new environmentally friendly data center plate liquid cooling dedicated coolant designed by the present invention has high metal corrosion resistance, non-metal compatibility, anti-scaling, anti-bacterial growth, and high electrical safety performance.

[0066] Comparative Example 1

[0067] 1,2-Propanediol: 45.000%, triethanolamine: 1.000%, L-lysine vanillin Schiff base: 0.200%, sebacic acid: 0.01%, GPE type polyether (molecular weight 3000): 0.001%, Congo red: 0.001%, pure water, balance.

[0068] Comparative Example 2

[0069] 1,2-Propanediol: 45.000%, triethanolamine: 1.000%, sebacic acid: 0.200%, dimethyl hexadecylpyridinium quaternary ammonium salt: 0.01%, GPE type polyether (molecular weight 3000): 0.001%, Congo red: 0.001%, pure water, balance.

[0070] Comparative Example 3

[0071] 1,2-Propanediol: 45.000%, triethanolamine: 1.000%, L-lysine vanillin Schiff base: 0.0100%, dimethyl hexadecylpyridinium quaternary ammonium salt: 0.01%, GPE type polyether (molecular weight 3000): 0.001%, Congo red: 0.001%, pure water, balance.

[0072] Comparative Example 4

[0073] 1,2-Propanediol: 45.000%, triethanolamine: 1.000%, L-lysine vanillin Schiff base: 0.300%, dimethyl hexadecylpyridinium quaternary ammonium salt: 0.01%, GPE type polyether (molecular weight 3000): 0.001%, Congo red: 0.001%, pure water, balance.

[0074] Comparative Example 5

[0075] 1,2-Propanediol: 45.000%, triethanolamine: 1.000%, L-lysine vanillin Schiff base: 0.200%, dimethyl hexadecylpyridinium quaternary ammonium salt: 0.0008%, GPE type polyether (molecular weight 3000): 0.001%, Congo red: 0.001%, pure water, balance.

[0076] Comparative Example 6

[0077] 1,2-Propanediol: 45.000%, triethanolamine: 1.000%, L-lysine vanillin Schiff base: 0.200%, dimethyl hexadecylpyridinium quaternary ammonium salt: 0.02%, GPE type polyether (molecular weight 3000): 0.001%, Congo red: 0.001%, pure water, balance.

[0078] The coolants screened from the formulas of Comparative Examples 1 to 6 were tested with reference to the testing method of Example 5.

[0079] Table 2 Performance test results of coolant formula screening

[0080]

[0081] As shown in Table 2, when the type of corrosion-inhibiting component is changed (Comparative Example 1 to Comparative Example 2), the conductivity of the coolant is significantly increased, and the corrosion inhibition effect is significantly reduced. When the dosage of the corrosion-inhibiting component formula is changed (Comparative Example 3 to Comparative Example 6), if the concentration of the corrosion inhibitor is too low, the less corrosion inhibitor is adsorbed discontinuously on the metal surface, and a good corrosion-inhibiting barrier film cannot be formed on the metal surface; and the concentration of the quaternary ammonium salt added is too low, and the antibacterial effect cannot be achieved. If the concentration of the corrosion inhibitor is too high, the interaction force between the polar groups of the Schiff base corrosion inhibitor is large, so that the Schiff base polar groups have poor adsorption to the metal surface and cannot form a film on the metal surface; and the concentration of the quaternary ammonium salt added is too high, the cations in the quaternary ammonium salt will react with the anionic groups in the amino acid Schiff base, causing the additive to fail. In summary, changing the type and dosage of the corrosion-inhibiting component significantly reduces the corrosion inhibition and antibacterial effects of the coolant.

Claims

1. A coolant, It is characterized in that The invention comprises an amino acid aromatic aldehyde Schiff base, a nitrogen-containing heterocyclic quaternary ammonium salt, a C2-C4 alkyl alcohol amine, a C3 diol, a defoamer, a pigment and water; wherein the mass ratio of the amino acid aromatic aldehyde Schiff base to the nitrogen-containing heterocyclic quaternary ammonium salt is 2:1 to 200:

1.

2. The coolant according to claim 1, It is characterized in that The mass ratio of the amino acid aromatic aldehyde Schiff base to the nitrogen-containing heterocyclic quaternary ammonium salt is 20:

1.

3. The coolant according to claim 1, It is characterized in that Calculated by mass fraction, it contains 0.02% to 0.2% of amino acid aromatic aldehyde Schiff base, 0.001% to 0.01% of nitrogen-containing heterocyclic quaternary ammonium salt, 0.1% to 1% of C2 to C4 alkyl alcohol amine, 25% to 45% of C3 diol, 0.0001% to 0.001% of defoaming agent, 0.0001% to 0.001% of pigment and the balance of water.

4. The coolant according to claim 1, It is characterized in that Calculated by mass fraction, it contains 0.2% of amino acid aromatic aldehyde Schiff base, 0.01% of nitrogen-containing heterocyclic quaternary ammonium salt, 1% of C2-C4 alkyl alcohol amine, 45% of C3 diol, 0.001% of defoaming agent, 0.001% of pigment and the balance of water; Or it contains 0.1% of amino acid aromatic aldehyde Schiff base, 0.005% of nitrogen-containing heterocyclic quaternary ammonium salt, 0.8% of C2-C4 alkyl alcohol amine, 33% of C3 diol, 0.0005% of defoaming agent, 0.0001% of pigment and the balance of water; Or it contains 0.02% of amino acid aromatic aldehyde Schiff base, 0.001% of nitrogen-containing heterocyclic quaternary ammonium salt, 0.1% of C2-C4 alkyl alcohol amine, 30% of C3 diol, 0.0001% of defoaming agent, 0.0005% of pigment and the balance of water; Or it contains 0.02% of amino acid aromatic aldehyde Schiff base, 0.001% of nitrogen-containing heterocyclic quaternary ammonium salt, 0.1% of C2-C4 alkyl alcohol amine, 25% of C3 diol, 0.0008% of defoamer, 0.0003% of pigment and the balance of water.

5. The cooling liquid according to claim 1, It is characterized in that The amino acid aromatic aldehyde Schiff base is selected from one or two of L-lysine vanillin Schiff base and L-lysine anisaldehyde Schiff base.

6. The cooling liquid according to claim 1, It is characterized in that The nitrogen-containing heterocyclic quaternary ammonium salt is selected from at least one of dimethyl dodecyl pyridinium quaternary ammonium salt, dimethyl hexadecyl pyridinium quaternary ammonium salt, dimethyl dodecyl imidazole quaternary ammonium salt and dimethyl hexadecyl imidazole quaternary ammonium salt.

7. The cooling liquid according to claim 1, It is characterized in that The C2-C4 alkyl alcohol amine is selected from at least one of monoethanolamine, diethanolamine and triethanolamine.

8. The coolant according to claim 1, It is characterized in that The C3 diol is selected from one or both of 1,2-propylene glycol and 1,3-propylene glycol.

9. The cooling liquid according to claim 1, It is characterized in that The composition comprises, by mass fraction, 0.2% of L-lysine vanillin Schiff base, 0.01% of dimethyl hexadecylpyridinium quaternary ammonium salt, 1% of triethanolamine, 45% of 1,2-propylene glycol, 0.001% of GPE type polyether with a molecular weight of 3000, 0.001% of Congo red and the balance of water; Or it contains 0.1% of L-lysine vanillin Schiff base, 0.005% of dimethyl hexadecyl imidazole quaternary ammonium salt, 0.8% of diethanolamine, 33% of 1,2-propylene glycol, 0.0005% of GPE type polyether with a molecular weight of 3000, 0.0001% of Congo red and the balance of water; Or comprising 0.02% of L-lysine condensed vanillin Schiff base, 0.001% of dimethyl dodecyl imidazole quaternary ammonium salt, 0.1% of monoethanolamine, 30% of 1,3-propylene glycol, 0.0001% of GPE type polyether with a molecular weight of 3000, 0.0005% of Congo red and the balance of water; Alternatively, the composition comprises 0.02% of L-lysine anisaldehyde Schiff base, 0.001% of dimethyl dodecyl pyridinium quaternary ammonium salt, 0.1% of monoethanolamine, 25% of 1,3-propylene glycol, 0.0008% of GPE type polyether with a molecular weight of 3000, 0.0003% of Congo red and the balance of water.

10. Use of the cooling liquid according to claim 1 in a liquid cooling system of a data center.

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