Cooling liquid for energy storage equipment

Abstract

The invention discloses a cooling liquid for energy storage equipment. The cooling liquid comprises the following components in percentage by weight: 25%-55% of propylene glycol, 0.4%-4% of organic alkali, 0.1%-1% of a corrosion inhibitor, 0.002%-0.004% of a defoaming agent, 0.0001%-0.001% of pigment and the balance of pure water. Through the synergistic effect of the tall oil-based amine ethyl imidazoline corrosion inhibitor and the bis Mannich base corrosion inhibitor, the corrosion inhibition performance of the energy storage cooling liquid on metal materials, especially aluminum alloy, is effectively improved, meanwhile, the energy storage cooling liquid has good compatibility on non-metal materials, and the service life of energy storage equipment can be prolonged.

Description

Technical Field

[0001] This invention relates to a coolant, and more particularly to a coolant for energy storage devices. Background Technology

[0002] With the rapid development of the energy storage industry, electrochemical energy storage technology has gradually received widespread attention and application. Electrochemical energy storage devices generate a certain amount of heat during operation, requiring a cooling medium to remove the heat in a timely manner to ensure the normal operation of the equipment. Coolant is the most commonly used cooling medium.

[0003] Energy storage coolants mainly consist of three parts: antifreeze, additives, and water. A qualified energy storage coolant must meet the following requirements: good heat dissipation performance, metal corrosion inhibition properties, compatibility with non-metallic materials, good antifreeze performance, and a long service life. Most commercially available coolants meet the basic requirements of thermal conductivity and antifreeze, but energy storage coolants that also possess good metal corrosion inhibition properties and compatibility with various non-metallic materials are less common. Furthermore, coolant storage stability and aluminum alloy protection are mutually exclusive. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a coolant for energy storage devices that has excellent corrosion inhibition properties for metals and is compatible with a variety of non-metallic materials.

[0005] Technical solution: The coolant for the energy storage device of the present invention comprises the following components by weight percentage: propylene glycol 25% to 55%, organic base 0.4% to 4%, corrosion inhibitor 0.1% to 1%, defoamer 0.002% to 0.004%, pigment 0.0001% to 0.001%, and the balance being pure water.

[0006] The propylene glycol is at least one of 1,2-propanediol and 1,3-propanediol, and the 1,2-propanediol meets the superior grade requirements of HG / T 5392-2018, while the 1,3-propanediol meets the requirements of HG / T 4980-2016.

[0007] The organic base is at least one of methyldiethanolamine and triethanolamine.

[0008] The corrosion inhibitor is a compound of tallylamine ethyl imidazoline and bismannich base.

[0009] The tall oil-based aminoethyl imidazoline corrosion inhibitor is at least one of aminoethyl imidazoline oleate, aminoethyl imidazoline linoleate, and cyclic aminoethyl imidazoline oleate.

[0010] The bismannich base corrosion inhibitor is at least one of 1,2-propanediamine bismannich base and 1,3-propanediamine bismannich base.

[0011] The tall oil-based ethyl imidazoline corrosion inhibitor has a weight percentage of 0.08% to 0.8% in the coolant, and the bis-Mannich base corrosion inhibitor has a weight percentage of 0.02% to 0.2% in the coolant.

[0012] The defoamer is a copolymer of ethylene oxide and propylene oxide (GPE) type polyether with a molecular weight of 3000.

[0013] The purified water meets the quality specifications for Grade III water in GB 6682-2008.

[0014] The method for preparing the coolant for the energy storage device according to the present invention specifically involves mixing the components according to the stated proportions.

[0015] The corrosion inhibitor system used in this invention is a compound system of tallylamine ethyl imidazoline corrosion inhibitor and bismannich base corrosion inhibitor. Bismannich base has a high charge density of nitrogen lone pairs of electrons and oxygen atoms, which can donate electrons to the metal surface and interact with it. Through the conjugated structure of the benzene ring, it receives electrons donated by atoms on the metal surface, causing the corrosion inhibitor molecules to adsorb onto the metal surface and form a dense protective film, thereby slowing down the corrosion of the metal by acidic solutions. The nitrogen atoms in tallylamine ethyl imidazoline have lone pairs of electrons, which can form coordinate bonds with empty orbitals on the aluminum metal surface, allowing tallylamine ethyl imidazoline to be firmly adsorbed onto the aluminum metal surface, forming a protective film that isolates the aluminum metal from direct contact with the external environment, thereby slowing down or even preventing corrosion of the metal material. The compound of tallylamine ethyl imidazoline corrosion inhibitor and bismannich base corrosion inhibitor can produce a synergistic effect, adsorbing and forming a dense thin film on the metal surface, improving the corrosion inhibition performance of the coolant on the metal.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) The present invention adopts a fully organic system formula, which has the advantages of long service life, environmental protection, and good compatibility between metals and non-metals, effectively solving the problem that the storage stability of coolant and the protective effect of aluminum alloy cannot be achieved at the same time; (2) The present invention adopts a corrosion inhibition system composed of tall oil-based amino ethyl imidazoline corrosion inhibitor and bis-Mannich base corrosion inhibitor, which enhances the corrosion inhibition effect of coolant on cast aluminum, copper, brass and stainless steel through the synergistic effect of the two, especially for aluminum metals such as 3-series aluminum, 4-series aluminum and 6-series aluminum, which have excellent corrosion inhibition and protection effects; (3) The present invention has good compatibility with non-metallic materials, which can extend the service life of components in energy storage equipment. Detailed Implementation

[0017] The technical solution of the present invention will be further described below. Unless otherwise specified, all raw materials used in the following embodiments are commercially available.

[0018] Example 1

[0019] The coolant for the energy storage device in this embodiment is a mixture of components shown in Table 1 by weight percentage:

[0020] Table 1

[0021] Components weight percentage 1,2-Propanediol 50％ Triethanolamine 2％ Methyldiethanolamine 2％ oleic acid aminoethyl imidazoline 0.8％ 1,2-Propanediamine type bis-Mannich base 0.2％ GPE type polyether copolymerized from ethylene oxide and propylene oxide 0.001％ Indigo dye 0.001％ Deionized water margin

[0022] The prepared coolant was then subjected to the following tests:

[0023] 1. Freezing point determination

[0024] The freezing point of the coolant was determined using an ice point apparatus, and the test method was carried out in accordance with standard SH / T 0090.

[0025] 2. Reserve alkalinity determination

[0026] The reserve alkalinity of the coolant was determined by titration, and the test method was carried out in accordance with standard SH / T 0091.

[0027] 3. Conduct a glass corrosion test at 88℃ for 1064 hours. The test method shall be in accordance with standard SH / T 0085. The pH value of the coolant shall be measured before and after the experiment, and the pH change shall be calculated.

[0028] 4. Conduct a 1000-hour compatibility test on ethylene propylene diene monomer (EPDM) rubber at 88℃, following the standard GB / T1690.

[0029] 5. Conduct a 1000-hour silicone rubber compatibility performance test at 88℃, following the standard GB / T 1690.

[0030] 6. Perform PA66 compatibility performance testing at 88℃ for 1000 hours, and conduct the test according to standard GB / T 1690.

[0031] 7. Perform PA12 compatibility performance test at 88℃ for 1000h, and the test method shall be in accordance with standard GB / T 1690.

[0032] 8. Conduct a hard water resistance stability test at 90℃±2℃ for 336 hours. The test method shall be in accordance with Appendix D of standard GB 29743.1.

[0033] The test data is shown in Table 3.

[0034] Examples 2-6

[0035] The coolants for each embodiment were prepared similarly to those in Example 1, except that the types of tall oil-based aminoethyl imidazoline and bismannich base were adjusted. The component changes are shown in Table 2, while the types and weight percentages of components not shown in Table 2 remain unchanged. The coolants for each embodiment were subjected to the same tests as those in Example 1, and the test results are shown in Table 3.

[0036] Comparative Examples 1-3

[0037] Coolants for each comparative example were prepared in a similar manner to those in Example 1, except that the coolant components were different, as shown in Table 2. Except for Comparative Example 1, the types and weight percentages of components not listed in Table 2 remained unchanged; Comparative Example 1 was a mixture of 50% by weight of 1,2-propanediol and water. The coolants for each comparative example were subjected to the same tests as in Example 1, and the test results are shown in Table 3.

[0038] Table 2

[0039]

[0040]

[0041] In Table 2, " / " indicates that the symbol does not exist.

[0042] Table 3

[0043]

[0044]

[0045] As shown in Table 3, compared with Comparative Example 1 (without the addition of tallylamine ethyl imidazoline and bismannich base), Examples 1-6, by adding tallylamine ethyl imidazoline and bismannich base to the coolant, significantly improved the corrosion inhibition performance of the coolant on copper, brass, steel, cast aluminum, 3-series aluminum alloys, 4-series aluminum alloys, and 6-series aluminum alloys. Although Comparative Example 2 (with only bismannich base) and Comparative Example 3 (with only tallylamine ethyl imidazoline) also showed some corrosion inhibition performance on copper, brass, and steel, Examples 1-6, which combined the two corrosion inhibitors, were significantly better than Comparative Examples 2 and 3 (which used only a single corrosion inhibitor) in terms of corrosion inhibition effect on cast aluminum, 3-series aluminum alloys, 4-series aluminum alloys, and 6-series aluminum alloys. This indicates that the synergistic effect between tallylamine ethyl imidazoline and bismannich base improved the corrosion inhibition performance of the coolant on aluminum alloys.

[0046] In addition, as shown in Table 3, the coolants of Examples 1 to 6 also have good compatibility with non-metallic materials, and possess excellent reserve alkalinity and hard water resistance. Furthermore, the coolants of Examples 1 to 6 showed significant advantages in the glass corrosion test, indicating that the service life of the coolant of the present invention is significantly improved.

[0047] Examples 7-10, Comparative Examples 4-5

[0048] The coolants for each example and comparative example were prepared similarly to those in Example 1, except that the weight percentages of tallylamine ethyl imidazoline and bismannich base were adjusted. The changes in component weight percentages are shown in Table 4, while the types and weight percentages of components not shown in Table 3 remained unchanged. The coolants for each example and comparative example were subjected to the same tests as in Example 1, and the test results are shown in Table 5.

[0049] Table 4

[0050] Serial Number Oleic acid aminoethyl imidazoline (wt%) 1,2-Propanediamine type bis-Mannich base (wt%) Example 1 0.8 0.2 Example 7 0.08 0.2 Comparative Example 4 0.9 0.2 Example 8 0.07 0.2 Example 9 0.8 0.02 Example 10 0.8 0.01 Comparative Example 5 0.8 0.3

[0051] Table 5

[0052]

[0053]

[0054]

[0055] As shown in Table 5, when the weight percentage of tallylamine ethyl imidazoline in the coolant is 0.08%-0.8% and the weight percentage of bis-Mannich base is 0.02%-0.2%, the coolant exhibits excellent metal corrosion inhibition effect. The corrosion inhibition performance is best when the ratio of tallylamine ethyl imidazoline to bis-Mannich base is 4:1. It also has good compatibility with non-metallic materials and excellent reserve alkalinity and hard water resistance.

[0056] Furthermore, the weight percentage of tallyl aminoethyl imidazoline used in this invention is less than 1%, and the weight percentage of bismannich base used is no more than 0.2%, which is significantly lower than the amount of tallyl aminoethyl imidazoline or bismannich base used alone in the prior art. This indicates that the amount of corrosion inhibitor used is reduced through the synergistic adsorption effect between tallyl aminoethyl imidazoline and bismannich base. The consumption of corrosion inhibitor is very small during use, and the corrosion inhibitor has superior metal corrosion inhibition performance while significantly reducing the amount of corrosion inhibitor used.

[0057] Comparative Examples 6–9

[0058] The coolants for Comparative Examples 6-9 were prepared similarly to those in Example 1, except that the type and content of the alkali used as a pH adjuster were adjusted. The component changes are shown in Table 6, while the types and weight percentages of components not shown in Table 6 remain unchanged. The coolants for each comparative example were subjected to the same tests as in Example 1, and the test results are shown in Table 7.

[0059] Table 6

[0060]

[0061]

[0062] Table 7

[0063]

[0064]

[0065] As shown in Table 7, compared with Comparative Example 7 (which did not add a pH adjuster), Example 1 improved the compatibility of the coolant with non-metallic materials by adding an organic base to the coolant. Compared with Comparative Example 6 (which used an inorganic base), the organic base pH adjuster significantly improved the compatibility of the coolant with non-metallic materials and gave the coolant excellent reserve alkalinity. Furthermore, the compatibility with non-metallic materials was best when the content of the organic base was between 0.4% and 4%.

Claims

1. An energy storage device coolant fluid, characterized by, The composition comprises the following components by weight percentage: propylene glycol 25%-55%, organic base 0.4%-4%, corrosion inhibitor 0.1%-1%, defoaming agent 0.002%-0.004%, pigment 0.0001%-0.001%, and the balance is pure water.

2. The energy storage device cooling fluid of claim 1, wherein, The propylene glycol is at least one of 1,2-propylene glycol and 1,3-propylene glycol.

3. The energy storage device cooling fluid of claim 1, wherein, The organic base is at least one of methyldiethanolamine and triethanolamine.

4. The energy storage device cooling fluid of claim 1, wherein, The corrosion inhibitor is a corrosion inhibitor compounded by talloil amine ethylimidazoline and double Mannich base.

5. The energy storage device cooling fluid of claim 4, wherein, The talloil amine ethylimidazoline corrosion inhibitor is at least one of oleic acid amine ethylimidazoline, linoleic acid amine ethylimidazoline and cyclic oleic acid amine ethylimidazoline.

6. The energy storage device cooling fluid of claim 4, wherein, The double Mannich base corrosion inhibitor is at least one of 1,2-propylenediamine type double Mannich base and 1,3-propylenediamine type double Mannich base.

7. The energy storage device cooling fluid of claim 4, wherein, The weight percentage of the talloil amine ethylimidazoline corrosion inhibitor in the coolant is 0.08%-0.8%, and the weight percentage of the double Mannich base corrosion inhibitor in the coolant is 0.02%-0.2%.

8. The energy storage device cooling fluid of claim 1, wherein, The defoaming agent is a polyether of ethylene oxide and propylene oxide copolymer GPE type.

9. The energy storage device cooling fluid of claim 1, wherein, The pigment is indigo dye.

10. The energy storage device cooling fluid of claim 8, wherein, The molecular weight of the polyether is 3000.

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