Silicone oil type immersion cooling fluid composition for charging device cooling system and preparation method

Abstract

The application discloses a silicon oil type immersion cooling liquid composition for a charging device cooling system, which comprises the following components in percentage by mass: 0.01-2% of a metal passivator, 0.01-2% of an anti-rust agent, 0.1-5% of a rubber protective agent, 0.005-0.05% of an anti-foaming agent, and the balance of dimethyl silicone oil, and the sum of the percentage by mass of the above components is 100%. The application further discloses a preparation method of the silicon oil type immersion cooling liquid composition, and specifically comprises the following steps: adding the metal passivator, the anti-rust agent, the rubber protective agent and the anti-foaming agent into the dimethyl silicone oil, and stirring at a temperature of 50-70 DEG C for 2-3 hours. The dimethyl silicone oil is used as a base oil, and a benzotriazole derivative containing triethoxysilane, a 2-aminoethyl heptadecenyl imidazoline derivative, an anti-foaming agent and a rubber protective agent are added, so that the prepared cooling liquid composition has excellent performance, and the copper corrosion resistance, the rust resistance and the material compatibility are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coolant compositions, and in particular relates to a silicone oil-type immersion coolant composition for a charging equipment cooling system, and also relates to a preparation method of the coolant composition. Background Art

[0002] High-power fast charging, which brings an electric vehicle's power battery to or near full capacity in a short period of time, also results in a rapid increase in heat generation and temperature rise in the charging gun terminals and cables. Sustained high temperatures can damage the charging device's electronic components and, in severe cases, can cause safety incidents. Therefore, a cooling system is required to maintain the normal operation of the charging equipment.

[0003] Dimethyl silicone oil offers excellent viscosity-temperature performance and strong antioxidant properties, but it is poorly sensitive to conventional additives. Consequently, some charging equipment manufacturers currently use low-viscosity dimethyl silicone oil as a coolant for their charging equipment. Dimethyl silicone oil has been shown to be corrosive to copper, stainless steel, and some rubber materials. Under certain conditions, long-term use of dimethyl silicone oil as a coolant can cause damage to charging equipment. Therefore, exploring coolants with corrosion resistance and material compatibility that can more effectively meet the needs of electric vehicle charging equipment is of great research significance. Summary of the Invention

[0004] An object of the present invention is to provide a silicone oil-based immersion coolant composition for a charging equipment cooling system.

[0005] Another object of the present invention is to provide a method for preparing the silicone oil-based immersion coolant composition.

[0006] The technical solution adopted by the present invention is a silicone oil-type immersion coolant composition for a charging equipment cooling system, which includes the following components in terms of mass percentage: 0.01-2% metal passivator, 0.01-2% rust inhibitor, 0.1-5% rubber protective agent, 0.005-0.05% anti-foaming agent, and the balance is dimethyl silicone oil, and the sum of the mass percentages of the above components is 100%.

[0007] The present invention is also characterized in that:

[0008] The metal deactivator is a functionalized benzotriazole.

[0009] The preparation method of functionalized benzotriazole is:

[0010] Benzotriazole, 1,6-dibromohexane, sodium hydroxide and DMF are mixed and reacted. After the reaction is completed, deionized water is added to the reaction system to dissolve DMF, and then dichloromethane is added to extract the product from the solution. The organic phases are combined, anhydrous sodium sulfate is added to remove water, filtered, and distilled under reduced pressure. The product is subjected to column chromatography to obtain N-(6-bromohexyl)benzotriazole; N-(6-bromohexyl)benzotriazole, γ-aminopropyltriethoxysilane, sodium hydroxide and DMF are mixed and reacted. After the reaction is completed, deionized water is added to the reaction system to dissolve DMF, and then dichloromethane is added to extract the product from the solution. The organic phases are combined, anhydrous sodium sulfate is added, filtered, and distilled under reduced pressure. The product is subjected to column chromatography to obtain a functionalized benzotriazole product.

[0011] The molar ratio of benzotriazole to 1,6-dibromohexane is 1:1; the molar ratio of N-(6-bromohexyl)benzotriazole to γ-aminopropyltriethoxysilane is 1:1; the reaction temperature is 25°C-30°C, and the reaction time is 8h-24h.

[0012] The rust inhibitor is a 2-aminoethyl heptadecenyl imidazoline derivative.

[0013] The preparation method of the 2-aminoethylheptadecenyl imidazoline derivative comprises the following steps: mixing 2-aminoethylheptadecenyl imidazoline, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and THF, carrying out a ring-opening reaction, performing reduced pressure distillation after the reaction, and subjecting the product to column chromatography to obtain the 2-aminoethylheptadecenyl imidazoline derivative.

[0014] The reaction temperature is 85° C.-95° C., the reaction time is 6 h-18 h; the molar ratio of 2-aminoethylheptadecenyl imidazoline to γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 1:1.

[0015] The anti-foaming agent is methyl silicone oil ester.

[0016] Another technical solution adopted by the present invention is a method for preparing a silicone oil-based immersion coolant composition for a charging equipment cooling system, specifically comprising:

[0017] Add metal passivator, rust inhibitor, rubber protective agent and anti-foaming agent to dimethyl silicone oil, and mix at 50-70° C. for 2-3 hours until the components are uniformly dissolved in the dimethyl silicone oil to obtain a coolant composition.

[0018] The beneficial effects of the present invention are: using dimethyl silicone oil as a base oil, and adding a benzotriazole derivative containing triethoxysilane, a 2-aminoethyl heptadecenyl imidazoline derivative, an anti-foaming agent and a rubber protective agent, the prepared coolant composition has excellent performance, and the anti-copper corrosion and anti-rust performance and material compatibility are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the reaction equation diagram of benzotriazole and 1,6-dibromohexane;

[0020] Figure 2 It is a diagram of the reaction equation of N-(6-bromohexyl)benzotriazole and γ-aminopropyltriethoxysilane;

[0021] Figure 3 This is a diagram of the reaction equation of 2-aminoethylheptadecenyl imidazoline and γ-(2,3-epoxypropoxy)propyltrimethoxysilane. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.

[0023] The present invention discloses a silicone oil-based immersion coolant composition for a charging equipment cooling system, comprising the following components in percentage by mass: 0.01-2% of a metal passivator, 0.01-2% of a rust inhibitor, 0.1-5% of a rubber protective agent, 0.005-0.05% of an anti-foaming agent, and the balance being dimethyl silicone oil, wherein the sum of the percentages by mass of the above components is 100%.

[0024] The metal deactivator is a functionalized benzotriazole;

[0025] The rust inhibitor is a 2-aminoethyl heptadecenyl imidazoline derivative;

[0026] Rubber protective agent is a substance containing silicone resin, such as EL1291;

[0027] The anti-foaming agent is methyl silicone oil ester;

[0028] The preparation method of functionalized benzotriazole is:

[0029] Benzotriazole, 1,6-dibromohexane, sodium hydroxide and DMF are mixed and reacted, such as Figure 1 As shown, after the reaction is completed, purification is carried out, that is, deionized water is added to the reaction system to dissolve DMF, and then dichloromethane is added to extract the product from the solution. The organic phases are combined after a small amount of multiple times, anhydrous sodium sulfate is added to the organic phase to remove water, the solid matter is filtered out, and the organic solvent is removed by vacuum distillation. The remaining product is subjected to column chromatography (V 石油醚 :V 乙酸乙酯 =20:1) to obtain N-(6-bromohexyl)benzotriazole.

[0030] The molar ratio of benzotriazole to 1,6-dibromohexane is 1:1;

[0031] The reaction temperature is 25°C-30°C, and the reaction time is 8h-24h;

[0032] N-(6-bromohexyl)benzotriazole, γ-aminopropyltriethoxysilane (KH550), sodium hydroxide and DMF were mixed and reacted as follows: Figure 2 As shown, after the reaction is completed, purification is carried out, that is, deionized water is added to the reaction system to dissolve DMF, and then dichloromethane is added to extract the product from the solution. The organic phases are combined after a small amount of multiple times, anhydrous sodium sulfate is added to the organic phase to remove water, the solid matter is filtered out, and the organic solvent is removed by vacuum distillation. The remaining product is subjected to column chromatography (V 石油醚 :V 乙酸乙酯 =50:1) to obtain the functionalized benzotriazole product.

[0033] The molar ratio of N-(6-bromohexyl)benzotriazole to γ-aminopropyltriethoxysilane is 1:1;

[0034] The reaction temperature is 25-30°C and the reaction time is 8-24;

[0035] Functionalized benzotriazole has high solubility in silicone oil systems and can significantly improve the anti-copper corrosion ability of silicone oil-type charging piles and charging gun coolants.

[0036] The preparation method of 2-aminoethyl heptadecenyl imidazoline derivative is as follows: 2-aminoethyl heptadecenyl imidazoline, γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH560), and THF are mixed. Figure 3 As shown, a ring-opening reaction was carried out. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the remaining product was purified by column chromatography (V 石油醚 :V 乙酸乙酯 =20:1) to obtain the target product 2-aminoethylheptadecenyl imidazoline derivative.

[0037] The reaction temperature is 85°C-95°C, and the reaction time is 6h-18h;

[0038] The molar ratio of 2-aminoethylheptadecenyl imidazoline to γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 1:1;

[0039] 2-Aminoethyl heptadecenyl imidazoline derivatives can be effectively dissolved in dimethyl silicone oil, and at the same time greatly improve the anti-corrosion ability of silicone oil.

[0040] The preparation method of the silicone oil-based immersion coolant composition for a charging equipment cooling system of the present invention comprises the following steps: adding a metal passivator, a rust inhibitor, a rubber protective agent, and an anti-foaming agent to dimethyl silicone oil, and blending the mixture at a temperature of 50-70° C. for 2-3 hours until the components are uniformly dissolved in the dimethyl silicone oil, thereby obtaining the coolant composition.

[0041] Example 1

[0042] The composition of the composition of this embodiment is shown in Table 1:

[0043] Table 1 Composition of the composition

[0044] name Dosage (%) Dimethicone 100％

[0045] Example 2

[0046] The composition of the composition of this embodiment is shown in Table 2:

[0047] Table 2 Composition of the composition

[0048] name Dosage (%) Benzotriazole 0.05 2-Aminoethylheptadecenyl imidazoline 0.05 Dimethicone 99.9

[0049] Example 3

[0050] The composition of the silicone oil-based immersion coolant composition of this embodiment is shown in Table 3:

[0051] Table 3 Composition of the composition

[0052] name Dosage (%) Functionalized benzotriazole 0.05 2-Aminoethylheptadecenyl imidazoline derivatives 0.05 Rubber protective agent 0.5 Dimethicone 99.4

[0053] Example 4

[0054] The composition of the silicone oil-based immersion coolant composition of this embodiment is shown in Table 4:

[0055] Table 4 Composition of the composition

[0056] name Dosage (%) Functionalized benzotriazole 0.1 2-Aminoethylheptadecenyl imidazoline derivatives 0.1 Rubber protective agent 1.0 Dimethicone 98.8

[0057] Example 5

[0058] The composition of the silicone oil-based immersion coolant composition of this embodiment is shown in Table 4:

[0059] Table 5 Composition of the composition

[0060] name Dosage (%) Functionalized benzotriazole 0.1 2-Aminoethylheptadecenyl imidazoline derivatives 0.1 Rubber protective agent 1.0 GTL2 98.8

[0061] Taking Examples 1-5 as an example, the test results of the blended coolant are shown in Table 6:

[0062] Table 6 Coolant test results

[0063]

[0064]

[0065] The data in Table 6 indicate that the physical and chemical properties of the samples in Examples 1-4 are comparable (specific heat, thermal conductivity, volume resistivity, breakdown voltage, kinematic viscosity, rotating oxygen bomb, flash point, and pour point data are similar). In Example 2, benzotriazole and 2-aminoethylheptadecenylimidazoline were added to Example 1. Due to the low solubility of these two additives in silicone oil, the stability of the coolant sample was reduced, and the solution became turbid after the copper corrosion test, making this sample unsuitable for use as a coolant for charging equipment. In Examples 3 and 4, modified metal passivators, rust inhibitors, and rubber protective agents were added to Example 1. The results showed that the coolant samples with these additives significantly improved their copper corrosion and rust resistance, as well as their material compatibility, and exhibited stable product performance. In Example 5, the dimethyl silicone oil in Example 4 was replaced with GTL2 base oil. Although GTL2 base oil exhibited excellent copper corrosion and rust resistance, the viscosity-temperature performance and antioxidant properties of the coolant sample were significantly reduced compared to Example 4.

[0066] This invention uses dimethyl silicone oil as a base oil, along with a benzotriazole derivative containing triethoxysilane, a 2-aminoethylheptadecenylimidazoline derivative, a rubber protective agent, and an anti-foaming agent. The resulting coolant exhibits excellent performance, significantly enhancing copper corrosion and rust resistance, and material compatibility. Coolant samples formulated with silicone oil exhibit excellent viscosity-temperature performance and strong thermal conductivity. Their rotating oxygen bomb life exceeds 2000 min, significantly exceeding the 360 ​​min achieved by coolant samples formulated with GTL-based base oils. This demonstrates strong antioxidant properties and effectively extends the product's service life.

Claims

1. A silicone oil-based immersion coolant composition for a charging equipment cooling system, characterized in that: The composition comprises the following components in terms of mass percentage: 0.01-2% metal passivator, 0.01-2% rust inhibitor, 0.1-5% rubber protective agent, 0.005-0.05% anti-foaming agent, and the balance is dimethyl silicone oil. The sum of the mass percentages of the above components is 100%. The metal passivator is a functionalized benzotriazole; the preparation method of the functionalized benzotriazole is: Benzotriazole, 1,6-dibromohexane, sodium hydroxide, and DMF are mixed and reacted. After the reaction is completed, deionized water is added to the reaction system to dissolve DMF, and then dichloromethane is added to extract the product from the solution. The organic phases are combined, anhydrous sodium sulfate is added to remove water, filtered, and distilled under reduced pressure. The product is subjected to column chromatography to obtain N-(6-bromohexyl)benzotriazole. N-(6-bromohexyl)benzotriazole, γ-aminopropyltriethoxysilane, sodium hydroxide, and DMF are mixed and reacted. After the reaction is completed, deionized water is added to the reaction system to dissolve DMF, and then dichloromethane is added to extract the product from the solution. The organic phases are combined, anhydrous sodium sulfate is added, filtered, and distilled under reduced pressure. The product is subjected to column chromatography to obtain a functionalized benzotriazole product. The rust preventive agent is a 2-aminoethyl heptadecenyl imidazoline derivative; the preparation method of the 2-aminoethyl heptadecenyl imidazoline derivative is as follows: 2-aminoethyl heptadecenyl imidazoline, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and THF are mixed to carry out a ring-opening reaction, and after the reaction is completed, vacuum distillation is carried out, and the product is subjected to column chromatography to obtain the 2-aminoethyl heptadecenyl imidazoline derivative.

2. The silicone oil-based immersion coolant composition for a charging equipment cooling system according to claim 1, wherein: The molar ratio of the benzotriazole to 1,6-dibromohexane is 1:1; the molar ratio of the N-(6-bromohexyl)benzotriazole to γ-aminopropyltriethoxysilane is 1:1; the reaction temperature is 25°C-30°C, and the reaction time is 8h-24h.

3. The silicone oil-based immersion coolant composition for a charging equipment cooling system according to claim 1, wherein: The reaction temperature is 85° C.-95° C., the reaction time is 6 h-18 h; the molar ratio of 2-aminoethylheptadecenyl imidazoline to γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 1:

1.

4. The silicone oil-based immersion coolant composition for a charging equipment cooling system according to claim 1, wherein: The anti-foaming agent is methyl silicone oil ester.

5. The method for preparing the silicone oil-based immersion coolant composition for a charging equipment cooling system according to any one of claims 1 to 4, characterized in that: Specifically: Add metal passivator, rust inhibitor, rubber protective agent and anti-foaming agent to dimethyl silicone oil, and mix at 50-70° C. for 2-3 hours until the components are uniformly dissolved in the dimethyl silicone oil to obtain a coolant composition.

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