Heat exchange working medium composition for new energy automobile as well as preparation method and application of heat exchange working medium composition

Abstract

The invention discloses a new energy automobile heat exchange working medium composition and a preparation method and application thereof, and belongs to the field of new energy automobile cooling system media. The heat exchange working medium composition for the new energy automobile is prepared from the following raw materials in percentage by weight: 0.1 to 4 percent of organosilane compounds, 0.1 to 5 percent of a DL-asparagine modified linoleic acid composition corrosion inhibitor, 0.05 to 0.8 percent of an azole corrosion inhibitor, 0.2 to 4 percent of organic amine compounds, 0.001 to 0.1 percent of a de-foaming agent, 1 to 66 percent of an anti-freezing agent and the balance of de-ionized water. The heat exchange working medium composition has relatively low conductivity, has the effects of cooling, corrosion inhibition, bacteriostasis, foam resistance and the like, also has the characteristics of long acting, environmental protection and resistance to corrosion of various series of metals, and can effectively protect a new energy radiator and a cold plate and effectively reduce the risk of pitting corrosion and local corrosion of an aluminum alloy material when being used as a cooling medium of the new energy radiator and the cold plate.

Description

Technical Field

[0001] This invention belongs to the field of cooling system media for new energy vehicles, specifically relating to a heat exchange working fluid composition for new energy vehicles, its preparation method, and its application. Background Technology

[0002] The new energy vehicle industry has grown from nothing to a leading position, but amidst this rapid development, the thermal management of battery systems remains a critical challenge for the entire sector. New energy vehicle batteries have high power density and complex charging and discharging processes, and my country's diverse climate further complicates battery heat dissipation. Especially during high temperatures and under heavy loads, overheating can impair normal power generation and potentially lead to safety incidents.

[0003] Traditional internal combustion engine coolants contain ionic corrosion inhibitors to prevent metal corrosion, resulting in high conductivity. In the event of an accident or malfunction, a short circuit can occur when the current from the power unit comes into contact with the coolant, potentially causing a fire. Furthermore, directly cooling the battery requires high insulation and corrosion resistance. New energy vehicles urgently need heat exchange fluids with low conductivity to improve heat dissipation efficiency, balance battery temperature, and prevent thermal runaway accidents.

[0004] Currently, some products with low electrical conductivity have appeared on the market, but the actual performance of these products is not ideal. Under the condition of adding corrosive ions, high-temperature corrosion tests are conducted, and they do not provide good protection for different types of aluminum materials, and a large number of pitting corrosions still occur.

[0005] Chinese patent CN108659797A discloses a cryoprotectant for new energy vehicles, with the following composition: 0.5-5 parts anhydrous ethylene glycol; 1 part water; and 0.003-0.2 parts nonionic corrosion inhibitor. The nonionic corrosion inhibitor is formed by reacting an acidic organic compound and an alcoholic organic compound under high temperature and alkaline conditions. The acidic organic compound is oleic acid or p-nitrobenzoic acid, and the alcoholic organic compound is sodium mercaptobenzothiazole or ethylenediamine alcohol. Although this nonionic corrosion inhibitor can reduce conductivity, it is prone to decomposition under long-term high-temperature use, thus failing to achieve long-term protection.

[0006] Chinese patent CN113652210A discloses a low-conductivity, long-lasting coolant and its preparation method. The coolant's formulation and mass fractions are as follows: 25-61% diol, 0.05-0.5% pipemidic acid, 0.02-0.2% pyridoxine, 0.01-0.2% cinnamaldehyde, 0.01-0.1% aminoglycoside, 0.001-0.01% organosilicon defoamer, and the balance being deionized water with a conductivity of less than 0.5 μS / cm. This formulation technology is applied to fuel cells, belonging to the ultra-low conductivity field, and requires the use of a mixed-bed ion exchange resin filter. This formulation provides a physicochemical treatment method for preventing corrosion of low-conductivity coolants, which is a commonly used measure for coolants used in fuel cells and has significant reference value for coolant applications in new energy systems.

[0007] Chinese patent CN114231258A discloses a low conductivity coolant, the composition of which is as follows: 10-50 parts deionized water, 50-90 parts ethylene glycol, 0.01-10 parts multi-effect composite corrosion inhibitor, and 0.001-0.1 parts defoamer; the multi-effect composite corrosion inhibitor is composed of polyether, polytricarboxylic acid, and dicarboxylic acid in a mass ratio of 1:(0.1-2):1; the polyether structure is as follows: In the formula, m = 0–100, n = 0–20, m and n are not simultaneously zero, R1 is hydrogen or a C1–C20 alkane; R2 is hydrogen or methyl; R3 is a C2–C5 alkane; and R4 is… Where r is hydrogen or a C1-C6 alkyl, cycloalkyl, or aromatic group, and R5 is carbon or nitrogen. The multi-effect composite corrosion inhibitor in this formula is mainly composed of carboxylic acids, and there is no organic amine to coordinate with its carboxylic acid groups. The liquid is prone to acidification during long-term operation, and it cannot provide long-term protection for the cooling system, making it unsuitable for use in the field of cooling system media for new energy vehicles.

[0008] Chinese patent CN118344855A discloses a low-conductivity corrosion-inhibiting coolant and its preparation method. The formula consists of: 55-60 parts deionized water, 40-45 parts ethylene glycol, 5-5.5 parts pentaerythritol, 2-2.5 parts a copolymer of chitosan and polyethylene glycol, 0.5-0.6 parts nanoparticles, 0.5-0.6 parts sebacic acid, 0.5-0.6 parts borax, 0.4-0.5 parts methylbenzotriazole, 0.3-0.4 parts sodium benzoate, 0.3-0.4 parts sodium silicate, 0.3-0.4 parts 2-(sodium-sulfonylphenyl)ethylsiloxane, 0.1-0.12 parts sodium hydroxide, and 0.01-0.02 parts polyether defoamer. This patent uses a copolymer of chitosan and polyethylene glycol to reduce ion transport in the coolant, thereby reducing the corrosion rate of the coolant. Regarding electrical conductivity, this method provides a low conductivity between 4.1 and 4.7 μS / cm and also employs nanotechnology, utilizing ethylenediaminetetraacetic acid diamine to ensure the stable presence of nanoparticles. However, this method does not specifically address whether the long-term stability of the low conductivity of the coolant meets the usage requirements. Furthermore, the instability of the nano-metal particles provided by this patent is also a potential hazard. Long-term nanoparticle aggregation cannot be completely avoided by stabilizers. Once nanomaterials precipitate, the potential hazards caused by the failure of the shielding method that reduces low conductivity through copolymers are real. Once the shielding agent fails, the presence of sodium salts may cause the solution conductivity to rise rapidly. At the same time, the precipitation of these relatively high molecular weight compounds may cause a large amount of sediment to clog the circulation pipe, leading to a chain reaction of accumulation corrosion and overheating corrosion.

[0009] Chinese patent CN115989601A discloses a novel coolant with low electrical conductivity. The coolant composition includes (A) at least one diol, (B) water, (C) at least one azole derivative, (D) at least one orthosilicate or alkoxyalkylsilane, (E) at least one tertiary amine containing at least one 2-hydroxyethyl or 2-hydroxypropyl group, (F) at least one monocarboxylic acid, (G) optionally at least one phosphonate, and (H) optionally at least one other coolant additive. The application of orthosilicates in this formulation provides a good reference for research and development. However, when testing the actual application effect of the product, the laboratory test results are significantly different from those of similar products. The corrosion weight loss rate of the aluminum alloy in the laboratory test product is relatively high, and there is basically no advantage compared with similar products. Therefore, the market promotion of this formulation is greatly limited.

[0010] Therefore, researching and developing a long-lasting, low-conductivity new energy heat exchange medium is of great significance. Summary of the Invention

[0011] To address the aforementioned technical problems, this invention provides a heat exchanger composition for new energy vehicles, its preparation method, and its application. This heat exchanger composition has low electrical conductivity and is characterized by long-lasting effect, environmental friendliness, and resistance to metal corrosion. Even if a cooling system malfunctions and leaks, it will not affect the normal operation of the equipment.

[0012] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0013] This invention provides a heat exchanger composition for new energy vehicles, comprising the following raw materials by weight percentage: 0.1-4% organosilane compounds, 0.1-5% DL-asparagine-modified linoleic acid composition corrosion inhibitor, 0.05-0.8% azole corrosion inhibitor, 0.2-4% organic amine compounds, 0.001-0.1% defoamer, 1-66% antifreeze, and the remainder being deionized water.

[0014] The heat exchanger composition for new energy vehicles preferably comprises the following raw materials by weight percentage: 0.3-1.0% silane polymer, 0.8-2.0% DL-asparagine modified linoleic acid composition corrosion inhibitor, 0.1-0.5% azole corrosion inhibitor, 0.5-2.0 parts by weight of organic amine compound, 0.005-0.05% defoamer, 40-66% antifreeze, and the remainder being deionized water.

[0015] The preparation method of the corrosion inhibitor of the DL-asparagine modified linoleic acid composition includes the following steps:

[0016] (1) Add linoleic acid dropwise to DL-asparagine at 30-40℃. After the linoleic acid is added, raise the temperature to 40-60℃ and keep the temperature constant for at least 6 hours.

[0017] (2) Maintain the reaction temperature at 40-60°C, add benzotriazole, 3-(2-benzothiazole thio)propionic acid and polyacrylic acid to the reaction solution, and continue stirring for at least 2 hours.

[0018] (3) Heat to 120-150℃ and perform vacuum distillation under a high vacuum condition of not less than -0.095Mpa to obtain DL-asparagine modified linoleic acid composition corrosion inhibitor, which can be used directly without further purification or refining.

[0019] Furthermore, the molar ratio of DL-asparagine to linoleic acid is 1:(1-5).

[0020] In step (2), the amounts of benzotriazole, 3-(2-benzothiazole thio)propionic acid and polyacrylic acid are 0.5~1.5%, 0.02~0.08%, and 0.005~0.015% of the mass of the reaction solution, respectively; the average molecular weight of the polyacrylic acid is 3000-5000.

[0021] The organosilane compound is any one or more of methyltrimethoxysilane, dimethoxydimethylsilane, diethoxydimethylsilane, methyltriethoxysilane, trimethylsilane, octyltriethoxysilane, vinyltrimethoxysilane, phenyltrimethylsilane, triisopropylsilane, tetramethoxysilane, tetraethoxysilane, 3-aminopropylmethyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, and 3-aminopropylmethyldiethoxysilane.

[0022] The azole corrosion inhibitor is any one or more of benzotriazole, methylbenzotriazole, N,N-dimethylbenzotriazole methylamine, N,N-diethylbenzotriazole methylamine, 4-carboxybenzotriazole, 5-carboxybenzotriazole, 2-mercaptobenzothiazole, 2-methylbenzothiazole, 5-ethylthiazole-2-amine, 2,5-dimercapto-1,3,4-thiadiazole, imidazole, and phenylimidazole.

[0023] The organic amine compound is any one or more of triethylamine, diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, N-methyldiethanolamine, tert-butylamine, polyetheramine, hexamethyleneimine, and N,N-dimethyltrimethylsilylamine.

[0024] The defoamer is at least one of silane defoamers and polyether defoamers.

[0025] The defoamer is one or more of DC-65, DC-62, and DF-830.

[0026] The antifreeze is at least one of glycols and glycol ethers.

[0027] The glycols are any one or more of ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, and 1,2,3-propanetriol; the glycol ethers are any one or more of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monoether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether, and triethylene glycol dimethyl ether.

[0028] The conductivity of the deionized water meets the requirements for Grade I water. Grade I water refers to water that meets the standards for Grade II water as specified in GB / T6682-2008 "Specifications and Test Methods for Water Used in Analytical Laboratories".

[0029] The present invention also provides a method for preparing the heat exchange working fluid composition for new energy vehicles, the preparation method comprising the following steps: heating the antifreeze to 40-60°C, adding an azole corrosion inhibitor under stirring, and after complete dissolution, adding silane polymer, DL-asparagine modified linoleic acid corrosion inhibitor, amine compound and the remaining deionized water in sequence and stirring evenly, finally adding an antifoaming agent and stirring evenly, and then passing through resin exchange and filtration.

[0030] Further, the resin exchange is performed by passing the resin through a mixed-bed ion exchange resin filter with a chloride ion content of no more than 0.4%, a sulfate ion content of no more than 0.3%, and a particle size of no less than 0.4 mm at a flow rate of 2-3 m / s, in order to remove trace small molecules and unstable impurity ions dissolved in the working fluid composition.

[0031] The filtration refers to the process performed in a 0.1-0.5 μm filter.

[0032] The present invention also provides the application of the heat exchange working fluid composition for new energy vehicles in radiators and cold plate cooling systems.

[0033] The heat exchanger composition for new energy vehicles provided by this invention improves the corrosion resistance, low-temperature adaptability, and heat exchange stability of the heat exchanger composition through the combination of its components.

[0034] Among them, organosilane compounds form silanol groups after hydrolysis, which can undergo condensation reaction with hydroxyl groups on the metal surface to form a dense siloxane protective film, which isolates corrosive media such as water and oxygen from contacting the metal substrate. This silane film can provide anchoring points for DL-asparagine modified linoleic acid composition corrosion inhibitors and azole corrosion inhibitors, promoting the adsorption of the two types of corrosion inhibitors on the surface or inside the film layer, and significantly improving the thickness and density of the corrosion inhibitor film.

[0035] DL-asparagine-modified linoleic acid corrosion inhibitors contain polar groups such as amide and carboxyl groups, which can chemically adsorb and bind to the metal surface to form an adsorption film, increasing the activation energy of metal surface corrosion and reducing ionization tendency. Simultaneously, the long-chain linoleic acid groups enhance the hydrophobicity of the film, preventing the diffusion of water and dissolved oxygen from the water to the metal surface, effectively preventing the interaction between corrosive media and the metal surface, providing mechanical isolation, and further improving corrosion inhibition. Furthermore, it has good thermal stability, is not easily decomposed, and can maintain its excellent corrosion inhibition performance even under prolonged high temperatures. Zolpidem corrosion inhibitors are particularly effective against copper and copper alloys, forming a stable heterocyclic protective film with copper ions through chelation, preventing copper corrosion and discoloration. The combined use of DL-asparagine-modified linoleic acid corrosion inhibitors and azole corrosion inhibitors can cover the entire metal system of aluminum or steel substrates, copper joints or pipes in new energy vehicle heat exchangers, avoiding the problem of uneven protection for different metals by a single corrosion inhibitor, and achieving all-metal adaptive protection.

[0036] Organic amines can adjust the heat exchange medium composition to a weakly alkaline state, reducing the corrosion of metals by acidic media, while promoting the dissociation and adsorption of corrosion inhibitors and enhancing their activity. In addition, amine molecules can form hydrogen bonds with the hydrolysis products of silane compounds, further strengthening the siloxane film and maintaining the long-term stability of the corrosion inhibition system.

[0037] Defoamers can quickly break up bubbles, prevent bubbles from accumulating, ensure that the heat exchange medium composition is in full contact with the metal surface, and ensure stable heat exchange efficiency; at the same time, they prevent the local negative pressure generated when bubbles break from impacting the corrosion inhibitor film, thus indirectly protecting the integrity of the protective film.

[0038] Antifreeze can lower the freezing point of the heat exchange working fluid composition and improve the viscosity stability of the heat exchange working fluid composition, preventing pipeline freezing and damage at low temperatures. In addition, the homogeneous system formed by the antifreeze and deionized water provides a stable dissolution environment for other raw materials, preventing the components from separating or stratifying at low temperatures. At the same time, the antifreeze contains hydroxyl groups, which can form weak interactions with silane hydrolysis products, further improving the system compatibility.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The heat exchange working fluid composition for new energy vehicles provided by this invention fully meets the technical requirements of GB29743.2-2025 "Motor Vehicle Coolant Part 2: Electric Vehicle Coolant". It is a functional liquid with cooling, corrosion inhibition, antibacterial, and anti-foaming effects, with a conductivity of 40-90 μS / cm. Under 800V high voltage, it effectively reduces short-circuit current and heat generation, reduces the efficiency of current breakdown and heat generation in the event of equipment leakage, prevents liquid vaporization in the discharge path, and reduces the generation of H2 and O2, thereby mitigating the risk of combustion and explosion from arc discharge. Simultaneously, this working fluid composition is long-lasting, environmentally friendly, and resistant to corrosion of various metals. In particular, it effectively protects the 2-series, 3-series, 4-series, 5-series, 6-series, and 7-series aluminum alloys widely used in new energy radiators and cold plates, effectively reducing the risk of pitting and localized corrosion. Even if a cooling system malfunctions and leaks, it will not affect the normal operation of the equipment. Detailed Implementation

[0041] The preparation methods of the DL-asparagine modified linoleic acid composition corrosion inhibitors in the various embodiments and comparative examples are as follows:

[0042] (1) Linoleic acid was added dropwise to DL-asparagine at 35℃. After the addition of linoleic acid was completed, the temperature was raised to 50℃ and the reaction was kept at a constant temperature for 6 hours.

[0043] (2) Maintain the reaction temperature at 50°C, add benzotriazole, 3-(2-benzothiazole thio)propionic acid and polyacrylic acid to the reaction solution, and stir continuously for 2 hours.

[0044] (3) Heat the reaction mixture to 135°C and perform vacuum distillation under a high vacuum of -0.095 MPa to obtain DL-asparagine modified linoleic acid composition corrosion inhibitor, which can be used directly without further purification or refining.

[0045] Furthermore, the molar ratio of DL-asparagine to linoleic acid is 1:3.

[0046] In step (2), the amounts of benzotriazole, 3-(2-benzothiazole thio)propionic acid and polyacrylic acid are 1.0%, 0.05% and 0.01% of the mass of the reaction solution, respectively; the average molecular weight of the polyacrylic acid is 3000-5000.

[0047] The resin filters used in each embodiment and comparative example are mixed-bed ion exchange resin filters with a chloride ion content of no more than 0.4%, a sulfate ion content of no more than 0.3%, and a particle size of no less than 0.4 mm.

[0048] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein. Similar to the given range value of "0.5% to 2%", this means that in this invention, the given range value includes the individual point values ​​within the range value and any value within the range formed by any two of these point values. For example, specifically, it can be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.2%, 1.4%, 1.6%, 1.8%, and 2%, and any value within the range formed by any two of these point values. The same applies below, and will not be repeated.

[0049] The present invention will be described in detail below with reference to the embodiments.

[0050] Example 1

[0051] A heat exchange working fluid composition for new energy vehicles is composed of the following raw materials: 530 kg of ethylene glycol, 438 kg of deionized water, 2.2 kg of diethoxydimethylsilane, 2.5 kg of tetramethoxysilane, 15 kg of DL-asparagine modified linoleic acid composition corrosion inhibitor, 1.5 kg of methylbenztriazole, 0.75 kg of 5-carboxybenzotriazole, 10 kg of diisopropanolamine, and 0.05 kg of DC-570 defoamer.

[0052] The preparation method of the heat exchange working fluid composition for new energy vehicles is as follows:

[0053] Ethylene glycol was heated to 50°C, and under stirring, methylbenzyltriazole and 5-carboxybenzotriazole were added and completely dissolved. Diethoxydimethylsilane, tetramethoxysilane, DL-asparagine-modified linoleic acid corrosion inhibitor, diisopropanolamine and deionized water were added in sequence and stirred evenly. Finally, DC-65 defoamer was added and stirred evenly. The mixture was then passed through a resin filter at a flow rate of 2 m / s, filtered through a 0.5 μm polypropylene filter, and then bottled.

[0054] Example 2

[0055] A heat exchanger composition for new energy vehicles is composed of the following raw materials: 500 kg of 1,2-propylene glycol, 476 kg of deionized water, 3 kg of 3-aminopropylmethyltrimethoxysilane, 3 kg of tetramethoxysilane, 10 kg of DL-asparagine-modified linoleic acid composition corrosion inhibitor, 0.5 kg of dimethylaminomethylphenyltriazole, 1.45 kg of 5-carboxybenzotriazole, 6 kg of N-methyldiethanolamine, and 0.05 kg of DC-62 defoamer.

[0056] The preparation method of the heat exchange working fluid composition for new energy vehicles is as follows:

[0057] 1,2-Propylene glycol was heated to 60°C and, under stirring, dimethylaminomethylphenyltriazole and 5-carboxybenzotriazole were added and completely dissolved. Then, 3-aminopropylmethyltrimethoxysilane, tetramethoxysilane, DL-asparagine-modified linoleic acid corrosion inhibitor, N-methyldiethanolamine and deionized water were added in sequence and stirred until homogeneous. Finally, DC-62 defoamer was added and stirred until homogeneous. The mixture was then passed through a resin filter at a flow rate of 2 m / s, filtered through a 0.5 μm polypropylene filter, and then bottled.

[0058] Example 3

[0059] A heat exchanger composition for new energy vehicles is composed of the following raw materials: 490 kg of ethylene glycol, 485.5 kg of deionized water, 3.5 kg of 3-aminopropylmethyltrimethoxysilane, 9.5 kg of DL-asparagine-modified linoleic acid composition corrosion inhibitor, 2 kg of dimethylaminomethylphenyltriazole, 1.2 kg of methylphenyltriazole, 8.25 kg of N,N-dimethyltrimethylsilane, and 0.05 kg of DF-830 defoamer.

[0060] The preparation method of the heat exchange working fluid composition for new energy vehicles is as follows:

[0061] Ethylene glycol was heated to 50°C, and under stirring, dimethylaminomethyltriazole and methyltriazole were added and completely dissolved. Then, 3-aminopropylmethyltrimethoxysilane, DL-asparagine-modified linoleic acid corrosion inhibitor, N,N-dimethyltrimethylsilane and deionized water were added in sequence and stirred until homogeneous. Finally, DF-830 defoamer was added, and the mixture was then passed through a resin filter at a flow rate of 3 m / s, filtered through a 0.5 μm polypropylene filter, and bottled.

[0062] Example 4

[0063] A heat exchanger composition for new energy vehicles is composed of the following raw materials: 487 kg of 1,2-propylene glycol, 489.5 kg of deionized water, 3.3 kg of tetramethoxysilane, 8.6 kg of DL-asparagine modified linoleic acid composition corrosion inhibitor, 2.5 kg of 5-carboxybenzotriazole, 5 kg of diisopropanolamine, 4.05 kg of triethanolamine, and 0.05 kg of DC-62 defoamer.

[0064] The preparation method of the heat exchange working fluid composition for new energy vehicles is as follows:

[0065] 1,2-Propylene glycol was heated to 50°C, and 5-carboxybenzotriazole was added under stirring to completely dissolve it. Tetramethoxysilane, DL-asparagine modified linoleic acid corrosion inhibitor, diisopropanolamine, triethanolamine, and deionized water were added in sequence and stirred evenly. Finally, DC-62 defoamer was added and stirred evenly. The mixture was then passed through a resin filter at a flow rate of 2 m / s, filtered through a 0.5 μm polypropylene filter, and then bottled.

[0066] Comparative Example 1

[0067] The heat exchange medium composition provided in this comparative example does not contain any corrosion inhibitors and consists of the following raw materials: 530 kg of ethylene glycol, 469.95 kg of deionized water, and 0.05 kg of DC-65 defoamer.

[0068] The preparation method of the heat exchange working fluid composition for new energy vehicles is as follows:

[0069] Ethylene glycol, deionized water, and DC-65 defoamer are stirred evenly, then passed through a resin filter at a flow rate of 2 m / s, and then filtered through a 0.5 μm polypropylene filter before being bottled.

[0070] Comparative Example 2

[0071] The new energy heat exchange working fluid composition was prepared under the same conditions as in Example 1, except that DL-asparagine modified linoleic acid composition corrosion inhibitor was not used, and only azole corrosion inhibitor was used.

[0072] The heat exchanger composition for new energy vehicles in this comparative example consists of the following raw materials: 530 kg of ethylene glycol, 438 kg of deionized water, 2.2 kg of diethoxydimethylsilane, 2.5 kg of tetramethoxysilane, 8.5 kg of methylbenztriazole, 8.75 kg of 5-carboxybenzotriazole, 10 kg of diisopropanolamine, and 0.05 kg of DC-65 defoamer.

[0073] Comparative Example 3

[0074] The BASF G22E+ electric vehicle coolant used in this comparative example is commercially available.

[0075] Test case

[0076] According to the content of GB29743.2-2025 "Motor Vehicle Coolant Part 2: Electric Vehicle Coolant", various tests were conducted on the heat exchange working fluid compositions for new energy vehicles in the above embodiments and comparative examples. The test results are shown in Table 1.

[0077] Table 1

[0078]

[0079] Table 1 shows that after the static corrosion test in Comparative Example 1, the metal sheet was completely corroded and the metal sheet lost a lot of weight, indicating that ethylene glycol and water-based heat exchange medium without corrosion inhibitors cannot be used as heat exchange mediums for electric vehicles.

[0080] After the static corrosion test in Comparative Example 2, pitting corrosion occurred on both the steel and aluminum sheets, indicating that the protection performance of the multi-metal composition corrosion inhibitor without the use of DL-asparagine modified linoleic acid composition is insufficient and its long-term high-temperature stability is poor.

[0081] Comparative Example 3 is a commercially available product. After the static corrosion test, the metal sheet showed low weight loss, but the aluminum sheet still showed trace corrosion, posing a risk for long-term use.

[0082] The new energy heat exchanger compositions in Examples 1-4 of this invention showed minimal changes in appearance and corrosion quality of the metal samples after static corrosion tests. Furthermore, the heat exchanger compositions exhibited good stability, indicating that the added DL-asparagine-modified linoleic acid corrosion inhibitor provided excellent protection for multiple metals. The heat exchanger performance of each example was significantly superior to that of the comparative example.

[0083] In summary, the new energy heat exchanger composition provided by this invention can ensure that the metals in the cooling system of new energy vehicles are not corroded while protecting the performance of the battery and reducing battery power loss. The new energy heat exchanger compositions provided in each embodiment have been tested and their performance indicators fully meet the technical requirements of GB29743.2-2025 "Motor Vehicle Coolant Part 2: Electric Vehicle Coolant" standard, and can effectively protect the cooling system of new energy vehicles.

[0084] The above detailed description of a heat exchanger composition for new energy vehicles, its preparation method, and its application, with reference to the embodiments, is illustrative rather than limiting. Several embodiments may be listed within the defined scope. Therefore, variations and modifications that do not depart from the overall concept of the present invention should be within the protection scope of the present invention.

Claims

1. A heat exchange working fluid composition for new energy vehicles, characterized in that, The heat exchanger composition for new energy vehicles comprises the following raw materials by weight percentage: 0.1-4% organosilane compounds, 0.1-5% DL-asparagine modified linoleic acid composition corrosion inhibitor, 0.05-0.8% azole corrosion inhibitor, 0.2-4% organic amine compounds, 0.001-0.1% defoamer, 1-66% antifreeze, and the remainder being deionized water.

2. The heat exchange working fluid composition for new energy vehicles according to claim 1, characterized in that, The heat exchanger composition for new energy vehicles comprises the following raw materials by weight percentage: 0.3-1.0% silane polymer, 0.8-2.0% DL-asparagine modified linoleic acid composition corrosion inhibitor, 0.1-0.5% azole corrosion inhibitor, 0.5-2.0 parts by weight of organic amine compound, 0.005-0.05% defoamer, 40-66% antifreeze, and the remainder being deionized water.

3. The heat exchange working fluid composition for new energy vehicles according to claim 1 or 2, characterized in that, The preparation method of the corrosion inhibitor of the DL-asparagine modified linoleic acid composition includes the following steps: (1) Add linoleic acid dropwise to DL-asparagine at 30-40℃. After the linoleic acid is added, raise the temperature to 40-60℃ and keep the temperature constant for at least 6 hours. (2) Maintain the reaction temperature at 40-60°C, add benzotriazole, 3-(2-benzothiazole thio)propionic acid and polyacrylic acid to the reaction solution, and continue stirring for at least 2 hours. (3) Heat to 120-150℃ and perform vacuum distillation under a high vacuum condition of not less than -0.095Mpa to obtain DL-asparagine modified linoleic acid composition corrosion inhibitor.

4. The heat exchange working fluid composition for new energy vehicles according to claim 1 or 2, characterized in that, The organosilane compound is any one or more of methyltrimethoxysilane, dimethoxydimethylsilane, diethoxydimethylsilane, methyltriethoxysilane, trimethylsilane, octyltriethoxysilane, vinyltrimethoxysilane, phenyltrimethylsilane, triisopropylsilane, tetramethoxysilane, tetraethoxysilane, 3-aminopropylmethyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, and 3-aminopropylmethyldiethoxysilane.

5. The heat exchange working fluid composition for new energy vehicles according to claim 1 or 2, characterized in that, The azole corrosion inhibitor is any one or more of benzotriazole, methylbenzotriazole, N,N-dimethylbenzotriazole methylamine, N,N-diethylbenzotriazole methylamine, 4-carboxybenzotriazole, 5-carboxybenzotriazole, 2-mercaptobenzothiazole, 2-methylbenzothiazole, 5-ethylthiazole-2-amine, 2,5-dimercapto-1,3,4-thiadiazole, imidazole, and phenylimidazole.

6. The heat exchange working fluid composition for new energy vehicles according to claim 1 or 2, characterized in that, The organic amine compound is any one or more of triethylamine, diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, N-methyldiethanolamine, tert-butylamine, polyetheramine, hexamethyleneimine, and N,N-dimethyltrimethylsilylamine.

7. The heat exchange working fluid composition for new energy vehicles according to claim 1 or 2, characterized in that, The defoamer is at least one of silane defoamers and polyether defoamers; the antifreeze is at least one of glycol substances and glycol ethers.

8. The heat exchange working fluid composition for new energy vehicles according to claim 7, characterized in that, The glycols are any one or more of ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, and 1,2,3-propanetriol; the glycol ethers are any one or more of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monoether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether, and triethylene glycol dimethyl ether.

9. The method for preparing the heat exchange working fluid composition for new energy vehicles according to any one of claims 1-8, characterized in that, The preparation method includes the following steps: heating the antifreeze to 40-60℃, adding azole corrosion inhibitors under stirring, and after complete dissolution, adding organosilane compounds, DL-asparagine modified linoleic acid composition corrosion inhibitors, amine compounds and the remaining deionized water in sequence and stirring evenly, finally adding defoamer and stirring evenly, and then passing through resin exchange and filtration.

10. The application of the heat exchange working fluid composition for new energy vehicles as described in any one of claims 1-8 in radiator and cold plate cooling systems.

Images