Silicone oil type immersed cooling liquid composition for charging equipment cooling system and preparation method of silicone oil type immersed cooling liquid composition

Abstract

The invention discloses a silicone oil type immersed cooling liquid composition for a cooling system of charging equipment, which comprises the following components in percentage by mass: 0.01-2% of a metal deactivator, 0.01-2% of an antirust 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 mass percentages of the components is 100%. The invention also discloses a preparation method of the silicone oil type immersed cooling liquid composition, and the preparation method specifically comprises the following steps: adding the metal deactivator, the antirust agent, the rubber protective agent and the anti-foaming agent into the dimethyl silicone oil, and regulating the temperature at 50-70 DEG C for 2-3 hours. The dimethyl silicone oil is adopted as the base oil, and meanwhile, the benzotriazole derivative containing triethoxysilane, the 2-aminoethyl heptadecenyl imidazoline derivative, the anti-foaming agent and the rubber protective agent are added, so that the prepared cooling liquid composition is excellent in performance, and the copper corrosion resistance, the rust resistance and the material compatibility are greatly improved.

Description

Technical Field

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

[0002] High-power fast charging means that the electric vehicle power battery reaches or approaches a fully charged state in a short period of time, which also causes the charging gun terminal and cable to generate heat rapidly and the temperature rises rapidly. Continuous high temperature can easily damage the electronic components of the charging device, and in serious cases, it can also cause safety accidents. Therefore, a cooling system is needed to cool down to ensure the normal use of the charging equipment.

[0003] Dimethyl silicone oil has excellent viscosity-temperature performance and strong antioxidant ability, but it is poorly sensitive to conventional additives. Therefore, some charging equipment manufacturers on the market currently directly use low-viscosity dimethyl silicone oil as the coolant for charging equipment. It has been proven that dimethyl silicone oil is corrosive to copper, stainless steel, and some rubber materials. Under certain conditions, long-term use of it as a coolant will cause certain damage to charging equipment. Therefore, it is of great research significance to explore coolants that are corrosion-resistant and material-compatible, and can more effectively meet the use needs of electric vehicle charging equipment. Summary of the invention

[0004] An object of the present invention is to provide a silicone oil type 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 type immersion coolant composition.

[0006] The technical solution adopted by the present invention is that the silicone oil-type immersion coolant composition for the cooling system of the charging equipment includes the following components according to 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, 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, 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 2-aminoethyl heptadecenyl imidazoline derivatives comprises the following steps: 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, the mixture is subjected to reduced pressure distillation and the product is subjected to column chromatography to obtain 2-aminoethyl heptadecenyl imidazoline derivatives.

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

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

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

[0017] The metal passivator, rust inhibitor, rubber protective agent and anti-foaming agent are added to dimethyl silicone oil, and the mixture is adjusted at 50-70° C. for 2-3 hours until the components are uniformly dissolved in the dimethyl silicone oil, thereby obtaining a coolant composition.

[0018] The beneficial effects of the present invention are as follows: dimethyl silicone oil is used as the 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 at the same time, and the prepared coolant composition has excellent performance, and the anti-copper corrosion, anti-rust performance and material compatibility are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0022] The present invention is described in detail below in conjunction with specific implementation modes and accompanying drawings.

[0023] The silicone oil-based immersion coolant composition for a charging device cooling system of the present invention comprises the following components in terms of mass percentage: 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 antifoaming agent, and the balance is dimethyl silicone oil, and the sum of the mass percentages 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] The 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 performed, 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, and the organic phases are combined after a small amount of multiple times, anhydrous sodium sulfate is added to the organic phase to remove water, and the solid matter is filtered to remove the organic solvent after reduced pressure distillation, and 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 are mixed and reacted as follows: Figure 2 As shown, after the reaction is completed, purification is performed, 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, and the organic phases are combined after a small amount of multiple times, anhydrous sodium sulfate is added to the organic phase to remove water, and the solid matter is filtered to remove the organic solvent after reduced pressure distillation, and the remaining product is subjected to column chromatography (V 石油醚 :V 乙酸乙酯 =50:1) to obtain a functionalized benzotriazole product.

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

[0034] The reaction temperature is 25°C-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 is carried out. After the reaction is completed, the solvent is removed by distillation under reduced pressure, and the remaining product is chromatographed (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-aminoethyl heptadecenyl 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 type immersion coolant composition for a charging equipment cooling system of the present invention is as follows: a metal passivator, a rust inhibitor, a rubber protective agent, and an anti-foaming agent are added to dimethyl silicone oil, and the mixture is adjusted 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 type 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 type 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 type 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 Example 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] According to the data in Table 6, the physical and chemical properties of the samples of 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). Example 2 adds benzotriazole and 2-aminoethyl heptadecenyl imidazoline on the basis of Example 1. Due to the low solubility of the above two additives in silicone oil, the stability of the coolant sample is reduced, and the solution is turbid after the copper corrosion test. The sample is not suitable for use as a coolant for charging equipment. Examples 3 and 4 add modified metal passivators, rust inhibitors, rubber protective agents and other additives on the basis of Example 1. The results show that the anti-copper corrosion, anti-rust performance and material compatibility of the coolant samples with the above additives are greatly improved and the product performance is stable. Example 5 replaces the dimethyl silicone oil in Example 4 with GTL2 base oil. Although it has excellent copper corrosion and rust prevention capabilities, the viscosity-temperature performance and antioxidant performance of the coolant sample are significantly reduced compared with Example 4.

[0066] The present invention uses dimethyl silicone oil as a base oil, and simultaneously adds a benzotriazole derivative containing triethoxysilane, a 2-aminoethyl heptadecenyl imidazoline derivative, a rubber protective agent and an anti-foaming agent. The prepared coolant product has excellent performance, and the anti-copper corrosion, anti-rust performance and material compatibility are greatly improved. The coolant sample prepared with silicone oil as the base oil has excellent viscosity-temperature performance, strong thermal conductivity, and its rotating oxygen bomb data is greater than 2000min, which is much higher than the coolant sample data of 360min prepared with GTL base oil. It has strong antioxidant ability and effectively improves the service life of the product.

Claims

1. A silicone oil type immersion coolant composition for a charging equipment cooling system, characterized in that: The invention comprises the following components in terms of mass percentage: 0.01-2% metal passivator, 0.01-2% rust preventer, 0.1-5% rubber protective agent, 0.005-0.05% antifoaming agent, and the balance is dimethyl silicone oil. The sum of the mass percentages of the above components is 100%.

2. The silicone oil type immersion coolant composition for a charging equipment cooling system according to claim 1, characterized in that: The metal deactivator is a functionalized benzotriazole.

3. The silicone oil type immersion coolant composition for a charging equipment cooling system according to claim 2, characterized in that: The preparation method of the functionalized benzotriazole is: Benzotriazole, 1,6-dibromohexane, sodium hydroxide and DMF are mixed and reacted. After the reaction, 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, 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.

4. The silicone oil type immersion coolant composition for a charging equipment cooling system according to claim 3, characterized in that: 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.

5. The silicone oil type immersion coolant composition for a charging equipment cooling system according to claim 1, characterized in that: The rust inhibitor is a 2-aminoethyl heptadecenyl imidazoline derivative.

6. The silicone oil type immersion coolant composition for a charging equipment cooling system according to claim 5, characterized in that: The preparation method of the 2-aminoethyl heptadecenyl imidazoline derivative comprises: mixing 2-aminoethyl heptadecenyl imidazoline, γ-(2,3-epoxypropoxy)propyltrimethoxysilane and THF, performing a ring-opening reaction, performing reduced pressure distillation after the reaction is completed, and performing column chromatography on the product to obtain the 2-aminoethyl heptadecenyl imidazoline derivative.

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

1.

8. The silicone oil type immersion coolant composition for a charging equipment cooling system according to claim 1, characterized in that: The anti-foaming agent is methyl silicone oil ester.

9. The method for preparing the silicone oil type immersion coolant composition for a charging equipment cooling system according to any one of claims 1 to 8, characterized in that: Specifically: The metal passivator, rust inhibitor, rubber protective agent and anti-foaming agent are added to dimethyl silicone oil, and the mixture is adjusted at 50-70° C. for 2-3 hours until the components are uniformly dissolved in the dimethyl silicone oil, thereby obtaining a coolant composition.

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