Long-service-life energy storage cooling liquid based on polyacid compounding as well as preparation method and application of long-service-life energy storage cooling liquid

Abstract

The invention relates to long-service-life energy storage cooling liquid based on polyacid compounding and a preparation method and application thereof, and belongs to the technical field of cooling liquid. The long-life energy storage cooling liquid based on polyacid compounding is prepared from the following components in parts by weight: 1 to 5 parts of monobasic organic acid, 0.1 to 5 parts of binary organic acid, 0.01 to 0.05 part of ternary organic acid, 0.05 to 0.5 part of an azole compound, 0.6 to 0.9 part of a pH (Potential of Hydrogen) regulator, 0.02 to 0.06 part of a chelating agent, 1 to 66 parts of dihydric alcohol, 0.005 to 0.05 part of a de-foaming agent and water. According to the cooling liquid provided by the invention, through a composite system of unitary, binary and ternary organic acids, a multi-level synergistic effect is realized, the service life of the cooling liquid is remarkably prolonged, and the cooling liquid has good metal corrosion resistance and non-metal material compatibility.

Description

Technical Field

[0001] This application relates to the technical field of coolant, and particularly relates to a long-life energy storage coolant based on polyacid composite, its preparation method and application. Background Art

[0002] With the rapid development of fields such as data centers, energy storage devices, and fuel vehicle engines, as a key thermal management medium, the performance of coolant directly affects the operation efficiency and lifespan of equipment. In the prior art, coolant mainly relies on single acid or simple mixed acid systems, and these systems have obvious deficiencies in terms of thermal conductivity, corrosion resistance, and non-metal compatibility. First of all, the coolant of the single acid system is prone to oxidation and acidification during long-term use, resulting in a rapid decline in its performance, and its service life usually does not exceed 5 years, which cannot meet the requirements of modern equipment for long-life coolant. Secondly, the existing coolant has poor metal corrosion resistance in high-temperature and high-humidity environments, which is prone to cause corrosion of the internal metal components of the equipment, thereby affecting the overall performance and safety of the equipment. In addition, the existing coolant has poor compatibility with non-metal materials, which is prone to cause expansion, aging, and even failure of non-metal components such as seals and pipes, increasing the maintenance cost and failure risk of the equipment. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the objectives of the embodiments of this application include providing a long-life energy storage coolant based on polyacid composite, its preparation method and application, so as to improve the service life of the coolant.

[0004] In a first aspect, the embodiments of this application provide a long-life energy storage coolant based on polyacid composite, which, by weight, includes: 1-5 parts of monobasic organic acid, 0.1-5 parts of dibasic organic acid, 0.01-0.05 parts of tribasic organic acid, 0.05-0.5 parts of azole compound, 0.6-0.9 parts of pH regulator, 0.02-0.06 parts of chelating agent, 1-66 parts of diol, 0.005-0.05 parts of defoaming agent, and water; the monobasic organic acid is R 1 -COOH, wherein R 1 is any one of a straight-chain alkyl group of C 1 -C 15 , a branched-chain alkyl group of C 4 -C 15 , and a cycloalkyl group of C 6 -C 15 ; the dibasic organic acid is HOOC-R 2 -COOH, wherein R 2 is any one of a straight-chain alkyl group of C 1 -C 15 , a branched-chain alkyl group of C 4 -C 15 , and a cycloalkyl group of C 6 -C15 any one of the cycloalkyl groups; the structural formula of the ternary organic acid is shown in formula (I),

[0005]

[0006] In formula (I), n is 2 - 7.

[0007] The coolant provided by this application realizes multi - level synergistic effects through a composite system of mono - carboxylic, di - carboxylic and tri - carboxylic organic acids, significantly improving the performance of the coolant. The mono - carboxylic organic acid forms a basic protective film on the metal surface. The di - carboxylic organic acid forms stable chelates with metal ions through its dicarboxyl structure, further enhancing the corrosion inhibition effect. The tri - carboxylic organic acid exerts stronger chelating and dispersing abilities due to its polycarboxyl structure, preventing metal ion precipitation and scaling. The synergistic effect of these polycarboxylic acids can form a dense multi - layer protective film on the metal surface, significantly delaying metal corrosion and oxidation, thereby extending the service life of the coolant. In addition, the azole compound synergistically acts with the polycarboxylic acid to further enhance the anti - corrosion performance of the coolant. The azole compound can form a highly efficient corrosion - inhibiting film on the metal surface, especially showing excellent performance on the surface of copper and its alloys. At the same time, the pH regulator maintains the pH value of the coolant system within a stable range (usually 7.5 - 11), preventing the system from being too acidic or too alkaline, thereby delaying the aging of the coolant, reducing the corrosion of metal and non - metal materials, and further extending the service life of the coolant. In terms of the metal anti - corrosion performance, the synergistic corrosion inhibition effect of the polycarboxylic acid and the azole compound, combined with the strong chelating ability of the tri - carboxylic organic acid, can form a dense protective film on the metal surface, effectively inhibiting the corrosion reaction of metal ions. This multi - layer protection mechanism can not only prevent metal corrosion but also maintain stable performance under harsh environments such as high temperature and high humidity. In addition, the mildness of the polycarboxylic acid results in low corrosivity to non - metal materials (such as rubber, plastics, etc.), enabling good compatibility with non - metal materials. At the same time, the stable pH value further reduces the erosion of non - metal materials, extending the service life of seals and pipelines. This good compatibility with non - metal materials enables the coolant to be widely used in complex equipment environments.

[0008] In some embodiments of this application, the mono - carboxylic organic acid includes one or more of neodecanoic acid, 2 - ethyl - 2,5 - dimethylhexanoic acid, n - decanoic acid, n - octanoic acid, isooctanoic acid and n - nonanoic acid.

[0009] The above - mentioned mono - carboxylic organic acids (such as neodecanoic acid, n - octanoic acid, etc.) have long carbon chains and specific functional groups carboxyl (-COOH) in their molecular structures, which can form a protective film on the metal surface, thereby effectively inhibiting the corrosion of metal materials. Especially in high - temperature and high - humidity environments, it can significantly extend the service life of the cooling system.

[0010] In some embodiments of the present application, the dibasic organic acid includes adipic acid and / or succinic acid.

[0011] Both adipic acid and succinic acid are dibasic carboxylic acids with two carboxyl functional groups, which can form an efficient buffer system with the alkaline components (such as pH regulators) in the coolant. This buffer system can stabilize the pH value of the coolant within the range of 7.5 - 11, preventing metal corrosion or a decline in coolant performance caused by pH fluctuations. Moreover, adipic acid and succinic acid can form a protective film on the metal surface, effectively inhibiting the corrosion of metal materials. Especially in high-temperature and high-humidity environments, it can significantly extend the service life of the cooling system. In addition, their molecular structures help to chelate metal ions, reducing the negative impact of metal ions on the coolant.

[0012] In some embodiments of the present application, in formula (I), n = 5.

[0013] When n = 5, the tribasic organic acid (abbreviated as L-190) contains three carboxyl groups and has stronger chelating ability and dispersing performance. It can form stable complexes with various metal ions, preventing the precipitation of metal ions and simultaneously improving the hard water resistance of the coolant.

[0014] In some embodiments of the present application, the defoamer includes polyether defoamer and / or silicone defoamer.

[0015] The above polyether defoamer or silicone defoamer can inhibit the foam generated during the use of the coolant and reduce the impact of foam on the heat transfer efficiency.

[0016] In some embodiments of the present application, the pH regulator is an inorganic base, and the inorganic base includes sodium hydroxide and / or potassium hydroxide.

[0017] The pH regulator (such as sodium hydroxide) can be used to maintain the pH value of the coolant within an appropriate range (usually 7.5 - 11), preventing the system from being too acidic or too alkaline. A stable pH value can delay the aging of the coolant and extend its service life.

[0018] In some embodiments of the present application, the chelating agent includes polyacrylic acid.

[0019] Polyacrylic acid is a high molecular compound, and its molecular chain contains multiple carboxyl functional groups (-COOH). These functional groups can form stable chelates with metal ions (such as calcium, magnesium, iron, etc.) in the coolant, thereby effectively preventing the deposition of metal ions in the cooling system or the initiation of corrosion; it can also disperse the impurities in the coolant and keep the coolant system clean.

[0020] In some embodiments of the present application, the azole compound includes methylbenzotriazole and / or benzimidazole.

[0021] Methylbenzotriazole and benzimidazole can form a dense protective film on the surfaces of metals such as copper, brass, and aluminum, effectively inhibiting the corrosion of metals. This protective film can remain stable even in high-temperature and high-humidity environments, significantly extending the service life of the cooling system.

[0022] In some embodiments of the present application, the diol includes ethylene glycol and / or propylene glycol.

[0023] The diol (such as ethylene glycol) is the basic solvent of the coolant, having good thermal conductivity and low-temperature fluidity. It can effectively transfer heat and prevent the coolant from freezing at low temperatures.

[0024] In a second aspect, an embodiment of the present application provides a method for preparing the above-mentioned long-life energy storage coolant based on polyacid composite, including: S1. Mixing the diol with water to obtain a mixed solution; S2. Adding a pH regulator to adjust the pH of the mixed solution to 7.5 - 11; heating the mixed solution with adjusted pH under stirring; S3. After heating is completed, adding a triazole compound and a chelating agent in sequence, stirring and dissolving, and then adding a monobasic organic acid, a dibasic organic acid, and a tribasic organic acid; finally adding an antifoaming agent; to obtain the long-life energy storage coolant based on polyacid composite.

[0025] In this preparation method, first, by mixing the diol with water, a uniform mixed solution is formed, providing a good basis for subsequent reactions; secondly, adding a pH regulator to adjust the pH of the mixed solution to 7.5 - 11. This step not only ensures the stability of the reaction environment but also helps improve the chemical stability and service life of the coolant; after adjusting the pH, heating and stirring the mixed solution. This process helps accelerate the reaction rate, enables the components to be fully mixed, and thus improves the uniformity and performance of the coolant; then, adding a triazole compound and a chelating agent in sequence, stirring and dissolving. This step can effectively prevent the corrosion of metal ions and extend the service life of the coolant; subsequently adding a monobasic organic acid, a dibasic organic acid, and a tribasic organic acid. The addition of these polyacids can significantly improve the buffering capacity and anti-corrosion performance of the coolant, further enhancing its stability and durability; finally adding an antifoaming agent can effectively reduce the foam generated during the use of the coolant and ensure the normal operation of the cooling system. In summary, through a reasonable raw material addition sequence and precise process control, the prepared coolant has excellent chemical stability, anti-corrosion performance, buffering capacity, and long life, and is suitable for the cooling requirements of various energy storage systems.

[0026] In some embodiments of the present application, the heating temperature is 60 - 80 °C.

[0027] In the above technical solution, a temperature range of 60 - 80 °C can effectively promote the dissolution and reaction of diol, water, and the subsequently added azole compounds, chelating agents, and polybasic organic acids. At this temperature, the molecular motion speeds up, and each component is more easily and uniformly mixed, thereby improving the reaction efficiency and the uniformity of the coolant. This temperature range not only ensures the full progress of the reaction but also avoids the decomposition or volatilization of certain organic components (such as azole compounds or organic acids) at too high temperatures, thus ensuring the chemical stability and performance of the coolant. Moreover, during the heating process, the pH regulator can be more uniformly dispersed in the solution, ensuring the stability of the pH value and further enhancing the anti-corrosion and buffering capabilities of the coolant. In addition, within this temperature range, the chelating agent can better bind with metal ions to exert its anti-corrosion effect; at the same time, the polybasic organic acid can also be fully dissolved and play its buffering and stabilizing roles, thereby enhancing the performance of the coolant.

[0028] In some embodiments of the present application, the volume ratio of diol to water is 1:(0.8 - 1).

[0029] Diol is one of the main components of the coolant, having excellent anti-freezing and heat-conducting properties, while water is the basic solvent of the coolant, which can effectively reduce costs and adjust the viscosity. A volume ratio of 1:(0.8 - 1) can achieve the best balance between the properties of diol and water, ensuring both the anti-freezing property and heat conduction efficiency of the coolant and avoiding excessive viscosity or increased costs caused by too much diol. Moreover, diol itself has a certain anti-corrosion property, and the addition of water can dilute the solution and adjust the pH value, further enhancing the anti-corrosion ability of the coolant. The ratio of 1:(0.8 - 1) can ensure the maximization of the protective effect of the coolant on metal materials and extend the service life of the cooling system.

[0030] Thirdly, the embodiments of the present application provide an application of the above long-life energy storage coolant based on polyacid composite in data centers, energy storage devices, or fuel vehicle engines.

[0031] The coolant provided by the present application realizes a comprehensive improvement in long life, excellent heat conduction performance, metal anti-corrosion performance, and non-metal compatibility performance through the multiple synergistic effects of polyacid composite technology, corrosion inhibition of azole compounds, stability of pH regulators, efficient heat transfer of diol, and foam suppression of defoamers; therefore, the coolant provided by the present application is particularly suitable for fields such as data centers, energy storage devices, and fuel vehicle engines, having broad application prospects and significant technical advantages. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0033] A long-life energy storage coolant based on polybasic acid composite, its preparation method, and application in the embodiments of this application will be specifically described below.

[0034] The embodiments of this application provide a long-life energy storage coolant based on polybasic acid composite, which, by weight, includes:

[0035] 1-5 parts of monobasic organic acid, 0.1-5 parts of dibasic organic acid, 0.01-0.05 parts of tribasic organic acid, 0.05-0.5 parts of azole compound, 0.6-0.9 parts of pH regulator, 0.02-0.06 parts of chelating agent, 1-66 parts of diol, 0.005-0.05 parts of defoaming agent, and water; the monobasic organic acid is R 1 -COOH, where R 1 is any one of straight-chain alkyl of C 1 -C 15 , branched-chain alkyl of C 4 -C 15 , and cycloalkyl of C 6 -C 15 ; the dibasic organic acid is HOOC-R 2 -COOH, where R 2 is any one of straight-chain alkyl of C 1 -C 15 , branched-chain alkyl of C 4 -C 15 , and cycloalkyl of C 6 -C 15 ; the structural formula of the tribasic organic acid is shown in formula (I),

[0036]

[0037] In formula (I), n is 2-7.

[0038] Among them, the monobasic organic acid includes, but is not limited to, one or more of neodecanoic acid, 2-ethyl-2,5-dimethylhexanoic acid, n-decanoic acid, n-octanoic acid, isooctanoic acid, and n-nonanoic acid. The dibasic organic acid includes, but is not limited to, adipic acid and / or succinic acid.

[0039] Exemplarily, n = 2, 3, 4, 5, 6, 7, and the tribasic organic acid when n = 5 is simply referred to as L-190.

[0040] In this application, the defoamer includes polyether defoamers and / or silicone defoamers. Exemplarily, polyether defoamers include, but are not limited to, BYK-019, Tego Foamex 812, BASF Foamstar 500, and Defoamer 70; silicone defoamers include, but are not limited to, EC-210 (reaction product of dimethylsiloxane and silica), Dow Corning 210, Wacker Silicones Antifoam, and Elkem Silicones 300 series.

[0041] In this application, the pH regulator is an inorganic base, and the inorganic base includes sodium hydroxide and / or potassium hydroxide.

[0042] In this application, the chelating agent includes polyacrylic acid (PAA).

[0043] PAA can dissolve in the coolant and has multi-carboxyl side chains. These carboxyl groups can chelate metal cations in the coolant, thereby providing hard water resistance and preventing the formation of precipitates in the coolant.

[0044] In this application, the azole compounds include, but are not limited to, methylbenzotriazole and / or benzimidazole.

[0045] The coolant provided by this application realizes a comprehensive improvement in the comprehensive performance of the coolant through the synergistic effect of the polybasic acid composite system and the functional components. The specific principles and effect analysis are as follows:

[0046] 1. Synergistic corrosion inhibition and long-term protection of the polybasic acid composite system

[0047] Monobasic organic acids (such as neodecanoic acid and n-octanoic acid) in the coolant form a basic adsorption layer on the metal surface through a single carboxyl structure, providing an initial corrosion inhibition barrier; dibasic organic acids (such as adipic acid and succinic acid) chelate with metal ions by virtue of their double carboxyl functional groups to form a stable cross-linked protective film, further enhancing the corrosion resistance; tribasic organic acids (such as L-190) achieve high-density chelation and dispersion through a multi-carboxyl structure, effectively inhibiting the precipitation of metal ions and hard water scaling. The three work together to build an "adsorption-chelating-dispersion" three-level protection mechanism, forming a dense multi-layer protective film on the metal surface, significantly delaying the oxidation and corrosion process, and thus greatly extending the service life of the coolant.

[0048] 2. Stability synergy of azole compounds and pH regulators

[0049] Azole compounds (such as methylbenzotriazole), as highly efficient corrosion inhibitors, preferentially adsorb on the active sites of metals such as copper and aluminum, forming a passivation film to block the electrochemical corrosion path; combined with the precise regulation of the system by a pH regulator (such as sodium hydroxide) (maintaining pH 7.5 - 11), the erosion of metal and non-metal materials in acidic or alkaline environments can be inhibited. Under the synergistic action of the two, the chemical stability of the coolant is significantly improved, effectively delaying oxidation degradation and component failure, and ensuring long-term service performance.

[0050] 3. Dual optimization of metal corrosion protection and non-metal compatibility

[0051] The composite corrosion inhibition system of polybasic acid and azole compounds not only inhibits the uniform corrosion and pitting corrosion of the metal matrix through a multi-layer protective film, but also blocks the redox chain reaction of ions such as Fe2+ and Cu2+ by virtue of the strong chelating ability of the ternary organic acid, fundamentally reducing the risk of electrochemical corrosion. At the same time, the low corrosiveness of the polybasic acid and the stable control of the system by the pH regulator significantly reduce the swelling and aging effects on non-metal materials such as rubber seals and engineering plastics, enabling them to maintain material integrity during long-term contact, thus comprehensively compatible with complex equipment environments.

[0052] The preparation method of the above-mentioned long-life energy storage coolant based on polybasic acid composite will be described below.

[0053] A preparation method of the above-mentioned long-life energy storage coolant based on polybasic acid composite includes the following steps:

[0054] (1) Mix the diol and water to obtain a mixed solution.

[0055] In the first step of the preparation process, the diol and water are mixed to form a stable basic solution. This step is beneficial to improving the solubility and dispersibility of subsequent components, and then improving the uniformity of the coolant.

[0056] Among them, the volume ratio of the diol to water is 1:(0.8 - 1). Exemplarily, the volume ratio of the diol to water includes but is not limited to 1:0.8, 1:0.85, 1:0.9, 1:0.92, 1:0.94, 1:0.96, 1:0.98, 1:1.

[0057] (2) Add a pH regulator to adjust the pH of the mixed solution to 7.5 - 11, and heat the mixed solution with adjusted pH under stirring.

[0058] In the second step, adjusting the pH of the mixed solution to the range of 7.5 - 11 is crucial for the subsequent addition of azole compounds and chelating agents. This step ensures the optimal environment for chemical reactions, avoiding component degradation or incomplete reactions caused by improper pH, thereby enhancing the stability and effectiveness of the coolant.

[0059] Among them, the heating temperature is 60 - 80°C. Exemplarily, the heating temperature includes but is not limited to 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, 69°C, 70°C, 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C, 80°C.

[0060] (3) After heating is completed, the azole compound and the chelating agent are added in sequence and stirred until dissolved.

[0061] In the third step, adding the azole compound and the chelating agent in sequence can make the two raw materials fully dissolved and evenly distributed, which is beneficial to improving the anti-corrosion performance and thermal stability of the coolant.

[0062] (4) Then add monobasic organic acid, dibasic organic acid and tribasic organic acid, and finally add the defoaming agent; a long-life energy storage coolant based on polyacid composite is obtained.

[0063] Subsequently, the addition of monobasic, dibasic and tribasic organic acids enables the full play of their synergistic effect, thereby forming an effective multi-layer protective film on the metal surface and further improving the corrosion resistance of the metal; finally, adding the defoaming agent after all components are mixed can effectively control the generation of foam and make the defoaming agent evenly distributed in the whole system, improving the thermal conductivity of the coolant and reducing the negative impact of foam on heat conduction.

[0064] In summary, through scientific regulation of the raw material addition sequence and process conditions, this preparation method significantly improves the stability, anti-corrosion performance and service life of the coolant. Its advantages are mainly reflected in the following aspects:

[0065] First, the optimization and construction of the basic system. In the initial stage, the diol is mixed with water. Utilizing the high boiling point, low freezing point and good heat conduction characteristics of the diol, a mixed solution with both fluidity and thermal stability is formed, laying a foundation for the dissolution and synergistic effect of subsequent functional additives. Subsequently, the system is precisely controlled within the weak alkaline range of 7.5 - 11 through a pH regulator, which not only avoids the erosion of strong alkalinity on equipment materials, but also inhibits the precipitation of metal ions and oxidation reactions through the alkaline environment, and at the same time provides suitable conditions for the functional release of subsequent organic acids.

[0066] Secondly, the synergy of the phased functional design. Under the conditions of heating and stirring, the fluidity of the system is enhanced and the molecular diffusion rate is increased. At this time, azole compounds and chelating agents are preferentially added, and thermal driving can be utilized to make them fully dispersed and anchored in the solution system. Azole compounds are more likely to adsorb on the metal surface to form a protective film under alkaline conditions, while chelating agents can preferentially complex free metal ions in the solution, effectively blocking the catalytic oxidation reaction path and inhibiting corrosion and precipitation formation from the source. Subsequently, monobasic, dibasic, and tribasic organic acids are introduced step by step. By utilizing the gradient buffering ability of their polycarboxylic acid structures, a dynamic pH balance system is formed with the alkaline environment, which not only enhances the neutralization ability of local acidic corrosion products but also strengthens the metal passivation effect through multidentate coordination, forming a multi-level anti-corrosion barrier.

[0067] Finally, the refined control of performance by the process sequence. The defoamer is added as the final additive, avoiding the problem of its failure due to premature dispersion under high temperature or strong stirring conditions, ensuring its complete retention in the system, effectively inhibiting the generation of foam during filling or circulation, and maintaining the heat transfer efficiency and pressure stability of the cooling system. The entire process is designed in the order of "basic solvent construction → pH environment regulation → corrosion inhibitor preposition → buffer system construction → defoaming function finalization", which not only maximizes the release of the functions of each component but also avoids competitive interference between components (such as the possible coordination competition between organic acids and chelating agents) through staged dissolution and reaction, ultimately obtaining a composite coolant with long life, low corrosion, and high stability.

[0068] The features and performance of the present application will be further described in detail below in conjunction with the embodiments.

[0069] Example 1

[0070] This example provides a long-life energy storage coolant based on polyacid composite, and its preparation method includes the following steps:

[0071] Mix 50 kg of ethylene glycol with water to obtain a mixed solution; add 0.71 kg of sodium hydroxide to adjust the pH of the mixed solution to 7.5 - 11, then heat the mixed solution with adjusted pH to 80 °C, and then sequentially add 0.1 kg of methylbenzotriazole and 0.05 kg of PAA; after stirring until completely dissolved, add 0.3 kg of 2-ethyl-2,5-dimethylhexanoic acid, 1.2 kg of n-octanoic acid, 0.4 kg of adipic acid, and 0.1 kg of tribasic organic acid L-190. After all are dissolved, add 0.02 kg of defoamer EC-210, and finally add dyes as required to obtain a clear and transparent long-life energy storage coolant based on polyacid composite.

[0072] Except for the dye, the total addition amount of other components (ethylene glycol, water, sodium hydroxide, methylbenzotriazole, PAA, 2-ethyl-2,5-dimethylhexanoic acid, n-caprylic acid, adipic acid, ternary organic acid L-190, and defoamer EC-210) is 100 kg.

[0073] Example 2

[0074] This example provides a long-life energy storage coolant based on polyacid composite, and its preparation method includes the following steps:

[0075] Mix 50 kg of ethylene glycol with 50 kg of water to obtain a mixed solution; add 0.74 kg of sodium hydroxide to adjust the pH of the mixed solution to 7.5 - 11, then heat the mixed solution with adjusted pH to 80 °C, and then sequentially add 0.1 kg of methylbenzotriazole and 0.05 kg of PAA; after stirring until completely dissolved, add 0.3 kg of neodecanoic acid, 1.2 kg of isooctanoic acid, 0.4 kg of adipic acid, 0.2 kg of ternary organic acid L-190, after all are dissolved, add 0.02 kg of defoamer EC-210, and finally add the dye as required to obtain a clear and transparent long-life energy storage coolant based on polyacid composite.

[0076] Except for the dye, the total addition amount of other components (ethylene glycol, water, sodium hydroxide, methylbenzotriazole, PAA, neodecanoic acid, isooctanoic acid, adipic acid, ternary organic acid L-190, and defoamer EC-210) is 100 kg.

[0077] Example 3

[0078] This example provides a long-life energy storage coolant based on polyacid composite, and its preparation method includes the following steps:

[0079] Mix 50 kg of ethylene glycol with 50 kg of water to obtain a mixed solution; add 0.82 kg of sodium hydroxide to adjust the pH of the mixed solution to 7.5 - 11, then heat the mixed solution with adjusted pH to 80 °C, and then sequentially add 0.1 kg of methylbenzotriazole and 0.05 kg of PAA; after stirring until completely dissolved, add 0.3 kg of n-decanoic acid, 1.2 kg of n-nonanoic acid, 0.4 kg of succinic acid, 0.3 kg of ternary organic acid L-190, after all are dissolved, add 0.02 kg of defoamer EC-210, and finally add the dye as required to obtain a clear and transparent long-life energy storage coolant based on polyacid composite.

[0080] Except for the dye, the total addition amount of other components (ethylene glycol, water, sodium hydroxide, methylbenzotriazole, PAA, n-decanoic acid, n-nonanoic acid, succinic acid, ternary organic acid L-190, and defoamer EC-210) is 100 kg.

[0081] Comparative Example 1

[0082] This comparative example provides an energy storage coolant, which only uses 50 kg of ethylene glycol mixed with 50 kg of water.

[0083] Comparative Example 2

[0084] This comparative example provides an energy storage coolant, and its preparation method includes the following steps:

[0085] Mix 50 kg of ethylene glycol with water to obtain a mixed solution; add 0.71 kg of sodium hydroxide to adjust the pH of the mixed solution to 7.5 - 11, then heat the mixed solution with adjusted pH to 80 °C, and then add 0.1 kg of methylbenzotriazole and 0.05 kg of PAA in sequence; after stirring until completely dissolved, add 2.0 kg of n - octanoic acid, wait until it is dissolved, then add 0.02 kg of defoamer EC - 210, and finally add dyes as required to obtain a clear and transparent long - life energy storage coolant based on polyacid composite.

[0086] Comparative Example 3

[0087] This comparative example is basically the same as Example 1, the difference is: replacing the ternary organic acid L190 with an acid with n = 2, 2,4,6 - tris(aminopropionic acid)-1,3,5 - triazine.

[0088] Comparative Example 4

[0089] This comparative example is basically the same as Example 1, the difference is: not adding the ternary organic acid L190.

[0090] For some parameters of the above - mentioned examples and comparative examples, please refer to Table 1 for details.

[0091] Table 1

[0092]

[0093]

[0094] Test Example

[0095] This test example conducts performance tests on the coolants provided in the above - mentioned Examples 1 - 3 and Comparative Examples 1 - 4, including metal corrosion tests and non - metal compatibility tests.

[0096] Among them, the metal corrosion test is carried out according to the glassware corrosion test method of the SH / T 0085-1991 standard for evaluating the corrosion of coolants to metals. Under the conditions of 88°C and passing air for 336h, the common metal materials in fuel vehicle engines, such as: copper, brass, steel, cast aluminum, solder, cast iron, etc. are subjected to corrosion tests, and the pH, appearance of the test solution, appearance and weight change of the metal sheet before and after the test are detected; referring to the standard GB 29743.1-2022, the qualified value of the metal corrosion resistance of the coolant is that the weight change of the metal sheet relative to that before the experiment is within ±10mg / sheet. For the above metal corrosion test results, please refer to Table 2 for details.

[0097] Among them, the non-metal compatibility test is carried out according to the test method for the resistance of vulcanized rubber or thermoplastic rubber to liquids in the standard GB / T 1690-2010. A compatibility test is carried out at 80°C for 168h. The rubber materials are ethylene propylene diene monomer rubber (EPDM), silicone rubber (VMQ), and fluororubber (FKM). The qualified values are relative to the rubber materials before the experiment: hardness change: ±5 IRHD, volume change rate: ±5%, change rate of breaking tensile strength: ±15%, change rate of elongation at break: ±30%. For the test results, please refer to Table 3 for details.

[0098] Table 2

[0099]

[0100] Remarks: "+" indicates that the test piece has increased in weight compared with that before the test; "-" indicates that the test piece has lost weight compared with that before the test.

[0101] Table 3

[0102]

[0103]

[0104] It can be seen from Table 2 and Table 3 that compared with Comparative Example 1 (without adding acid), Comparative Example 2 (only adding one kind of monobasic acid), Comparative Example 3 (not using L190 for tribasic acid), and Comparative Example 4 (not adding tribasic acid), the long-life energy storage coolant based on polybasic acid composite provided by this application can significantly slow down the corrosion of coolants to various metals and has good compatibility with non-metals, thereby extending the service life of the coolant.

[0105] The embodiments described above are some embodiments of this application, rather than all embodiments. The detailed description of the embodiments of this application is not intended to limit the scope of this application that is claimed, but merely represents the selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

Claims

1. A long-life energy storage coolant based on polyacid composite, characterized in that: In parts by weight, it includes: 1-5 parts of monobasic organic acid, 0.1-5 parts of dibasic organic acid, 0.01-0.05 parts of tribasic organic acid, 0.05-0.5 parts of azole compound, 0.6-0.9 parts of pH regulator, 0.02-0.06 parts of chelating agent, 1-66 parts of diol, 0.005-0.05 parts of defoaming agent and water; The monobasic organic acid is R1-COOH, wherein R1 is C1-C 15 Straight chain alkyl, C4-C 15 Branched alkyl and C6-C 15 Any one of the cycloalkyl groups of The dibasic organic acid is HOOC-R2-COOH, wherein R2 is C1-C 15 Straight chain alkyl, C4-C 15 Branched alkyl and C6-C 15 Any one of the cycloalkyl groups of The structural formula of the ternary organic acid is shown in formula (I), In formula (I), n is 2-7.

2. The long-life energy storage coolant based on polyacid composite according to claim 1, characterized in that: The monobasic organic acid includes one or more of neodecanoic acid, 2-ethyl-2,5-dimethylhexanoic acid, n-decanoic acid, n-octanoic acid, isooctanoic acid and n-nonanoic acid.

3. The long-life energy storage coolant based on polyacid composite according to claim 1, characterized in that: The dibasic organic acid includes adipic acid and / or succinic acid.

4. The long-life energy storage coolant based on polyacid composite according to claim 1, characterized in that: In the formula (I), n=5.

5. The long-life energy storage coolant based on polyacid composite according to any one of claims 1 to 4, characterized in that: The defoamer includes a polyether defoamer and / or an organosilicon defoamer; Optionally, the pH adjuster is an inorganic base, and the inorganic base includes sodium hydroxide and / or potassium hydroxide.

6. The long-life energy storage coolant based on polyacid composite according to any one of claims 1 to 4, characterized in that: The chelating agent includes polyacrylic acid.

7. The long-life energy storage coolant based on polyacid composite according to any one of claims 1 to 4, characterized in that: The azole compound includes tolyltriazole and / or benzimidazole; Optionally, the diol comprises ethylene glycol and / or propylene glycol.

8. A method for preparing a long-life energy storage coolant based on a polyacid composite as claimed in any one of claims 1 to 7, characterized in that: include: S1. mixing the diol with water to obtain a mixed solution; S2. Adding a pH adjusting agent to adjust the pH of the mixed solution to 7.5-11; heating the mixed solution having a good pH adjustment under stirring; S3. After the heating is completed, the azole compound and the chelating agent are added in sequence, stirred to dissolve, and then the monobasic organic acid, the dibasic organic acid and the tribasic organic acid are added; finally, the defoaming agent is added; The long-life energy storage coolant based on polyacid composite is obtained.

9. The preparation method according to claim 8, characterized in that: The heating temperature is 60-80°C; Optionally, the volume ratio of the diol to water is 1:(0.8-1).

10. Use of the long-life energy storage coolant based on a polyacid composite as described in any one of claims 1 to 7 in a data center, energy storage equipment or a fuel vehicle engine.

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