Long-acting corrosion inhibition type electric automobile cooling liquid and preparation method thereof

Abstract

The invention discloses a long-acting corrosion inhibition type electric automobile cooling liquid and a preparation method thereof. The long-acting corrosion inhibition type electric automobile cooling liquid comprises the following components in parts by weight: 50-80 parts of an anti-freezing agent; 0.5 to 2 parts of a pH value regulator; 2-5 parts of an aluminum alloy corrosion inhibitor; 0.1 to 0.3 part of a copper corrosion inhibitor; 0.05 to 0.2 part of a cosolvent; 0.1 to 0.2 part of a defoaming agent; 0.01 to 0.02 part of dye; and the balance of deionized water. The aluminum alloy corrosion inhibitor is siloxane-based pyrrolidone prepared through hydrosilylation reaction, has an excellent anti-corrosion protection effect on aluminum alloy, and does not cause great increase of the conductivity of a system, so that a low-conductivity long-acting corrosion inhibition type cooling liquid product applicable to electric automobiles is obtained, and the service life of the cooling liquid product is prolonged. And all performances meet national standard requirements.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric vehicle cooling liquid, and particularly relates to a long-acting corrosion-inhibiting electric vehicle cooling liquid and a preparation method thereof. BACKGROUND

[0002] With the vigorous development of new energy, electric vehicles have ushered in a golden period of rapid development. Replacing fuel-driven with electric energy as a power source is an important direction of energy transformation, so electric vehicles are leading the transportation field towards a green and intelligent future. With the application of electric energy, the safety of the electric vehicle cooling system has become the focus of people's attention. This is because the traditional engine coolant for fuel vehicles generally uses inorganic salts or organic carboxylic acid additives for blending, and the electrical conductivity is usually above 2000 muS / cm. High conductivity liquid as a coolant can cause short circuit, short connection, high pressure arc and self-ignition disaster accidents when leakage occurs. Therefore, GB 29743.2 clearly stipulates that the electrical conductivity of the cooling liquid for electric vehicles should not be higher than 100 muS / cm, so the traditional fuel engine coolant cannot be directly used. Moreover, a large number of aluminum alloy parts are used in the electric vehicle cooling system, so under the condition that a large number of inorganic salt or organic carboxylic acid corrosion inhibitors cannot be introduced, how to prevent the metal corrosion problem of the cooling system has become the key research direction of the electric vehicle cooling liquid. SUMMARY

[0003] Therefore, the application aims to provide a long-acting corrosion-inhibiting electric vehicle cooling liquid and a preparation method thereof to solve at least one technical problem in the background art.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows: A long-acting corrosion-inhibiting electric vehicle cooling liquid comprises, by weight: an antifreeze agent 50-80 parts; a pH value regulator 0.5-2 parts; an aluminum alloy corrosion inhibitor 2-5 parts; a copper corrosion inhibitor 0.1-0.3 parts; a cosolvent 0.05-0.2 parts; an antifoaming agent 0.1-0.2 parts; a dye 0.01-0.02 parts; and the balance is deionized water.

[0005] Further, the antifreeze agent is ethylene glycol. Preferably, the antifreeze agent is polyester-grade ethylene glycol.

[0006] Further, the pH regulator is one or more of triethanolamine, diglycolamine, 2-amino-2-methyl-1-propanol, ethanolamine, isopropanolamine.

[0007] Further, the aluminum alloy corrosion inhibitor is compound (I); (I).

[0008] Further, the preparation method of compound (I) comprises the following steps: In a three-necked flask, 0.8-1.2 parts of vinylpyrrolidone is dissolved in toluene solution and mixed with 98-102 ppm of platinum catalyst, under the condition of nitrogen protection, the temperature is raised by stirring, 1-1.4 parts of trimethoxysilane is added dropwise into the three-necked flask by using a constant pressure dropping funnel, after the addition is completed, the temperature is raised and the reaction is continuously stirred, after cooling, the toluene solvent is removed by rotary evaporation to obtain compound (I); Preferably, the platinum catalyst is Karstedt catalyst.

[0009] Further, the time for stirring and raising the temperature before dropping is 8-12 min, and the temperature is 38-42℃; After the addition is completed, the temperature is raised to 58-62℃, and the reaction is continuously stirred for 4.8-5.2 hours.

[0010] Further, the copper corrosion inhibitor is one or more of benzotriazole, methylbenzotriazole, thiadiazole; Preferably, the co-solvent comprises one or more of gelbert acid, n-octanoic acid, iso-nonyl acid; Preferably, the defoaming agent is polyether type defoaming agent L62; Preferably, the dye is a water-soluble fluorescent dye, more preferably a fruit green colorant.

[0011] Further, the deionized water is pure water obtained after ion filtration treatment, and the conductivity is required to be less than 1 μS / cm.

[0012] The preparation method of the long-acting corrosion-inhibiting electric vehicle coolant described above comprises the following steps: the pH regulator, the composite aluminum alloy corrosion inhibitor, and the copper corrosion inhibitor are added into deionized water, and stirred until uniformly dispersed into a slightly turbid solution; then the co-solvent is added dropwise until the solution becomes clear and transparent, and continues to be stirred; then the antifreeze agent is added, and the stirring is continued while the temperature is lowered to room temperature; then the defoaming agent and the dye are added, and stirred until uniform to obtain a clear and transparent long-acting corrosion-inhibiting electric vehicle coolant. Further, the pH regulator, the composite aluminum alloy corrosion inhibitor, and the copper corrosion inhibitor are added into deionized water, and stirred for 8-12 min until uniformly dispersed into a slightly turbid solution; Preferably, the co-solvent is added dropwise until the solution becomes clear and transparent, and continues to be stirred for 8-12 min; Preferably, a defoaming agent is added again with the dye, and stirred for 8-12 minutes until uniform.

[0013] Compared with the prior art, the long-acting corrosion-inhibiting electric vehicle coolant and the preparation method thereof have the following advantages: The siloxane-based pyrrolidone prepared by the hydrosilylation reaction is used as an aluminum corrosion inhibitor, so that the coolant has a long-acting metal corrosion protection effect. This is because the pyrrolidone has a polar group structure containing a nitrogen heterocycle and a carbonyl group, can form a dense network protection film, covers the metal surface to play a protective role, and the siloxane structure introduced by the hydrosilylation reaction can form a strong Al-O-Si bond on the surface of the aluminum alloy, enhance the adsorption of the network protection film on the aluminum alloy, and improve the strength of the protection film, thereby achieving a long-acting corrosion effect on the aluminum alloy.

[0014] (2) The long-acting corrosion-inhibiting electric vehicle coolant has the synthesized siloxane-based pyrrolidone as a non-ionic additive, so that the conductivity of the electric vehicle coolant product prepared by adding water will not be greatly increased, the conductivity of the product can meet the standard requirement of not higher than 100 muS / cm, the metal corrosion hazard of the cooling system can be avoided, the probability of a short circuit of an electrical component causing a fire accident can be reduced, and the solubility stability of the siloxane-based pyrrolidone can be improved by compounding with a small-molecule acid-type cosolvent, so that the hydrolysis of the siloxane structure to form cross-linkable silanol structure is prevented, the generation of precipitated sediments is avoided, and the long-acting corrosion effect is ensured. DETAILED DESCRIPTION

[0015] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0016] The present application will be described in detail below with reference to the embodiments.

[0017] The long-acting corrosion-inhibiting electric vehicle coolant and the preparation method thereof include the following steps: a formula amount of a pH adjuster, a composite aluminum alloy corrosion inhibitor, and a copper corrosion inhibitor are added to a formula amount of deionized water, stirred for 10 minutes until uniformly dispersed into a slightly turbid solution; a cosolvent is added dropwise until the solution becomes clear and transparent, and stirring is continued for 10 minutes; a formula amount of an antifreeze agent is added, and the stirring is continued while the temperature is reduced to room temperature; a formula amount of a defoaming agent and a dye is added, and stirred for 10 minutes until uniform, to obtain a clear and transparent long-acting corrosion-inhibiting electric vehicle coolant product.

[0018] One part of vinylpyrrolidone was dissolved in toluene solution and placed in a three-necked flask with 100 ppm platinum catalyst (Karstedt catalyst). Under nitrogen protection, the mixture was stirred and heated. 1.2 parts of trimethoxysilane were added dropwise to the three-necked flask using a constant pressure dropping funnel. After the addition was complete, the temperature was increased and the reaction was stirred continuously. After cooling, the toluene solvent was removed by rotary evaporation to obtain compound (Ⅰ).

[0019] The following examples and comparative examples all use the preparation method described above.

[0020] Example 1 A long-lasting corrosion-inhibiting electric vehicle coolant comprises the following components in parts by weight: 55 parts polyester-grade ethylene glycol, 1.5 parts isopropanolamine, 3 parts siloxane pyrrolidone, 0.25 parts methylbenzotriazole, 0.08 parts guerbert acid, 0.1 parts polyether defoamer L62, 0.01 parts fruit green colorant, and the balance being deionized water.

[0021] Example 2 A long-lasting corrosion-inhibiting electric vehicle coolant comprises the following components in parts by weight: 55 parts polyester-grade ethylene glycol, 2 parts triethanolamine, 4 parts siloxane pyrrolidone, 0.3 parts benzotriazole, 0.12 parts n-octanoic acid, 0.1 parts polyether defoamer L62, 0.01 parts fruit green colorant, and the balance being deionized water.

[0022] Example 3 A long-lasting corrosion-inhibiting electric vehicle coolant comprises the following components in parts by weight: 55 parts polyester-grade ethylene glycol, 0.5 parts 2-amino-2-methyl-1-propanol, 5 parts siloxane pyrrolidone, 0.2 parts benzotriazole, 0.16 parts n-octanoic acid, 0.1 parts polyether defoamer L62, 0.01 parts fruit green colorant, and the balance being deionized water.

[0023] Comparative Example 1 A long-lasting corrosion-inhibiting electric vehicle coolant comprises the following components in parts by weight: 55 parts polyester-grade ethylene glycol, 1.5 parts isopropanolamine, 3 parts siloxane pyrrolidone, 0.25 parts methylbenzotriazole, 0.1 parts polyether defoamer L62, 0.01 parts fruit green colorant, and the balance being deionized water.

[0024] Comparative Example 2 A long-lasting corrosion-inhibiting electric vehicle coolant comprises the following components in parts by weight: 55 parts polyester-grade ethylene glycol, 2 parts triethanolamine, 4 parts siloxane pyrrolidone, 0.3 parts benzotriazole, 0.1 parts polyether defoamer L62, 0.01 parts fruit green colorant, and the balance being deionized water.

[0025] Comparative Example 3 A long-lasting corrosion-inhibiting electric vehicle coolant comprises the following components in parts by weight: 55 parts polyester-grade ethylene glycol, 0.5 parts 2-amino-2-methyl-1-propanol, 5 parts siloxane pyrrolidone, 0.2 parts benzotriazole, 0.1 parts polyether defoamer L62, 0.01 parts fruit green colorant, and the balance being deionized water.

[0026] Comparative Example 4 Commercially available domestic electric vehicle coolant product MC100.

[0027] Comparative Example 5 Imported electric vehicle coolant product G22.

[0028] Comparative Example 6 A long-lasting corrosion-inhibiting electric vehicle coolant comprises the following components in parts by weight: 55 parts polyester-grade ethylene glycol, 1.5 parts isopropanolamine, 0.25 parts methylbenzotriazole, 0.08 parts Guerbert acid, 0.1 parts polyether defoamer L62, 0.01 parts fruit green colorant, and the balance being deionized water. The difference from Example 1 is that siloxane alkyl pyrrolidone is not added.

[0029] Experiment content: The tests were conducted on Examples 1-3 and Comparative Examples 1-6 with reference to certain contents of GB 29743.2-2025. The test results are shown in Table 1 below: Table 1 Test Results The results show that the performance of Examples 1-3 all meet the standard requirements. The comparative example, due to the lack of a co-solvent for the siloxane alkylpyrrolidone, resulted in a slightly turbid system and precipitation issues during high-temperature testing. This indicates that the synthesized siloxane alkylpyrrolidone exhibits good compatibility with small-molecule acid co-solvents, especially the Guerbert acid in Example 1, which showed the best effect and minimal weight change in each sample. In summary, this patent has developed a low-conductivity, long-lasting corrosion-inhibiting electric vehicle coolant product that meets national standards.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A long-acting corrosion-inhibiting electric vehicle coolant, characterized by: By weight components include: Antifreeze 50-80 parts; pH adjuster 0.5-2 parts; Aluminum alloy corrosion inhibitor 2-5 parts; Copper corrosion inhibitor 0.1-0.3 parts; Co-solvent 0.05-0.2 parts; Defoamer 0.1-0.2 parts; Dye 0.01-0.02 parts; The balance is deionized water.

2. The long-acting corrosion-inhibiting electric vehicle coolant according to claim 1, characterized in that: The antifreeze is ethylene glycol; Preferably, the antifreeze is polyester grade ethylene glycol.

3. The long-acting corrosion-inhibiting electric vehicle coolant of claim 1, wherein: The pH adjuster is one or more of triethanolamine, diethanolamine, 2-amino-2-methyl-1-propanol, ethanolamine, isopropanolamine.

4. The long-acting corrosion-inhibiting electric vehicle coolant of claim 1, wherein: The aluminum alloy corrosion inhibitor is compound (I); （Ⅰ）。 5. The long-acting corrosion-inhibited electric vehicle coolant of claim 4, wherein: The preparation method of compound (I) includes the following steps: In a three-necked flask, 0.8-1.2 parts of vinyl pyrrolidone is dissolved in toluene solution, and mixed with 98-102 ppm platinum catalyst, under the condition of nitrogen protection, stirring and heating, using a constant pressure dropping funnel to add 1-1.4 parts of trimethoxysilane to the three-necked flask, after the addition is completed, heating and continuous stirring reaction, cooling and rotary evaporation to remove toluene solvent, to obtain compound (I); Preferably, the platinum catalyst is Karstedt catalyst.

6. The long-acting corrosion-inhibited electric vehicle coolant of claim 4, wherein: The time for stirring and heating before dropping is 8-12 min, and the temperature is 38-42℃; The temperature for heating after the addition is completed is 58-62℃, and the continuous stirring reaction time is 4.8-5.2 hours.

7. The long-acting corrosion-inhibiting electric vehicle coolant of claim 1, wherein: The copper corrosion inhibitor is one or more of benzotriazole, methyl benzotriazole, and thiadiazole; Preferably, the co-solvent includes one or more of Gerber acid, n-octanoic acid, and iso-nonyl acid; Preferably, the defoamer is a polyether type defoamer L62; Preferably, the dye is a water-soluble fluorescent dye, and more preferably a fruit green colorant.

8. The long-acting corrosion-inhibited electric vehicle coolant of claim 1, wherein: The deionized water is pure water obtained after ion filtration treatment, with a conductivity of less than 1 μS / cm.

9. A method for preparing a long-lasting corrosion-inhibiting electric vehicle coolant according to any one of claims 1-8, characterized in that: The preparation method includes the following steps: adding the pH adjuster, the composite aluminum alloy corrosion inhibitor, and the copper corrosion inhibitor to the deionized water, stirring until uniformly dispersed as a slightly turbid solution; then adding the co-solvent until the solution becomes clear and transparent, and continuing to stir; then adding the antifreeze, continuously stirring while cooling to room temperature; then adding the defoamer and the dye, stirring until uniform, to obtain a clear and transparent long-acting corrosion type electric vehicle coolant.

10. The long-acting corrosion-inhibited electric vehicle coolant of claim 1, wherein: The pH adjuster, the composite aluminum alloy corrosion inhibitor, and the copper corrosion inhibitor are added to the deionized water, and stirred for 8-12 minutes until uniformly dispersed as a slightly turbid solution; Preferably, the co-solvent is added until the solution becomes clear and transparent, and continues to stir for 8-12 minutes; Preferably, the defoamer and the dye are added, and stirred for 8-12 minutes until uniform.

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