Silicon-free low-conductivity cooling liquid as well as preparation method and application thereof

Abstract

The invention provides a silicon-free low-conductivity cooling liquid as well as a preparation method and application thereof, and belongs to the field of automotive chemicals. The invention provides a silicon-free low-conductivity cooling liquid, which is prepared from the following preparation raw materials in percentage by mass: 0.05 to 0.1 percent of binary organic acid, 0.5 to 1.0 percent of alcohol amine, 0.2 to 0.5 percent of quinoline derivative, 0.1 to 0.2 percent of azole derivative, 1.0 to 5.0 percent of polyethylene glycol, 40 to 55 percent of ethylene glycol, 100 ppm of defoaming agent, 100 ppm of coloring agent and the balance of water. Through the synergistic effect of all the preparation raw materials in the cooling liquid, the excellent corrosion resistance of the cooling liquid can be kept on the premise that the low conductivity is smaller than 100 [mu] S / cm.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemicals for vehicles, in particular to a low-conductivity coolant without silicon and a preparation method and application thereof. BACKGROUND

[0002] Coolant is an indispensable functional product for realizing the thermal management of the chemical package for vehicles of new energy vehicles: 1. The coolant can improve the thermal stability and thermal uniformity of the chemical package for vehicles, keep the chemical package for vehicles within the optimal working temperature range, and avoid local overheating of the chemical package for vehicles to cause the overall power chemical source to lose control; 2. The coolant can promptly export the heat generated by the motor, thereby avoiding thermal shutdown and ensuring the safe operation of the motor.

[0003] The power system and electrical system of an electric vehicle contain numerous high-voltage and large-current components. If the coolant leaks onto these electrical components due to good corrosive effect, and the coolant itself has conductivity, it may cause electrical short circuit, generate a large amount of heat, and further cause damage to electrical components, and even cause a fire. SUMMARY

[0004] The present application provides a low-conductivity coolant without silicon and a preparation method and application thereof. The low-conductivity coolant without silicon has good corrosion resistance and low conductivity.

[0005] The present application provides a low-conductivity coolant without silicon, which comprises the following raw materials by mass fraction: 0.05-0.1% of a dibasic organic acid, 0.5-1.0% of an alcohol amine, 0.2-0.5% of a quinoline derivative, 0.1-0.2% of an azole derivative, 1.0-5.0% of polyethylene glycol, 40-55% of ethylene glycol, and the balance of water.

[0006] Preferably, the low-conductivity coolant without silicon comprises the following raw materials by mass fraction: 0.06-0.09% of a dibasic organic acid, 0.6-0.9% of an alcohol amine, 0.3-0.45% of a quinoline derivative, 0.12-0.18% of an azole derivative, 1.5-4% of polyethylene glycol, 45-50% of ethylene glycol, and the balance of water.

[0007] Preferably, the dibasic organic acid comprises one or more of sebacic acid, adipic acid, and succinic acid.

[0008] Preferably, the alcohol amine comprises one or more of monoethanolamine, diethanolamine, triethanolamine, and isopropyl amine.

[0009] Preferably, the quinoline derivative comprises one or more of quinoline, 8-hydroxyquinoline, and 2-hydroxy-4-methylquinoline.

[0010] Preferably, the azole derivatives include one or more of benzotriazole and methylbenzotriazole.

[0011] Preferably, the polyethylene glycol includes one or more of PEG-400, PEG-600, PEG-800 and PEG-1000.

[0012] Preferably, by mass fraction, the silicon-free low-conductivity coolant further includes the following raw materials: 100 ppm of defoamer and 100 ppm of colorant; The defoamer includes a polyether defoamer; the colorant includes one or more of lemon yellow, quinoline yellow, brilliant blue, and rose red 777.

[0013] The present invention also provides a method for preparing the silicon-free, low-conductivity coolant described in the above technical solution, comprising the following steps: Ethylene glycol is mixed with a portion of water and an alkanolamine in sequence. The resulting mixture is then mixed with a dibasic organic acid, a quinoline derivative, an azole derivative, and polyethylene glycol for a saponification reaction. The resulting system is then mixed with the remaining water to obtain the silicon-free, low-conductivity coolant. When the raw materials for preparing the silicon-free, low-conductivity coolant also include defoamers and colorants, the preparation method includes the following steps: Ethylene glycol is mixed with a portion of water and an alkanolamine in sequence. The resulting mixture is then mixed with a dibasic organic acid, a quinoline derivative, an azole derivative, and polyethylene glycol for a saponification reaction. The resulting system is then mixed with an antifoaming agent, a coloring agent, and the remaining water to obtain the silicon-free, low-conductivity coolant.

[0014] The present invention also provides the application of the silicon-free low-conductivity coolant described in the above technical solution or the silicon-free low-conductivity coolant prepared by the preparation method described in the above technical solution in electric vehicles.

[0015] The present invention provides a silicon-free, low-conductivity coolant in which the dibasic acid reacts with an alkanolamine to ensure the coolant's corrosion resistance against carbon steel and aluminum. Simultaneously, the alkanolamine ensures the coolant maintains a high reserve alkalinity, effectively inhibiting acidification during use. Furthermore, quinoline derivatives, acting as corrosion inhibitors, further enhance the product's corrosion resistance against aluminum (electric vehicle thermal management systems involve large amounts of aluminum); azole derivatives improve the coolant's corrosion resistance against copper; and polyethylene glycol comprehensively strengthens the coolant's corrosion resistance against various metals. Therefore, through the synergistic effect of the various raw materials in the coolant preparation process, the present invention achieves excellent corrosion resistance while maintaining a low conductivity (<100 μS / cm). Detailed Implementation

[0016] This invention provides a silicon-free, low-conductivity coolant, comprising, by mass fraction, the following raw materials: Dibasic organic acids 0.05-0.1%, alkanolamines 0.5-1.0%, quinoline derivatives 0.2-0.5%, azole derivatives 0.1-0.2%, polyethylene glycol 1.0-5.0%, ethylene glycol 40-55%, and the balance being water.

[0017] As a preferred embodiment, the silicon-free, low-conductivity coolant comprises the following raw materials by mass fraction: Dibasic organic acids 0.06-0.09%, alkanolamines 0.6-0.9%, quinoline derivatives 0.3-0.45%, azole derivatives 0.12-0.18%, polyethylene glycol 1.5-4%, ethylene glycol 45-50%, defoamer 100ppm, colorant 100ppm, and the balance being water.

[0018] As a further preferred embodiment, the silicon-free, low-conductivity coolant comprises the following raw materials by mass fraction: Dibasic organic acids 0.07-0.08%, alkanolamines 0.7-0.8%, quinoline derivatives 0.35-0.4%, azole derivatives 0.15-0.16%, polyethylene glycol 2-3%, ethylene glycol 46-48%, defoamer 100ppm, colorant 100ppm, and the balance being water.

[0019] The raw materials for preparing the silicon-free, low-conductivity coolant of the present invention, by mass fraction, include 0.05-0.1% of a dibasic organic acid, which in specific embodiments may be 0.06%, 0.07%, 0.08%, or 0.09%. The dibasic organic acid preferably includes one or more of sebacic acid, adipic acid, and succinic acid.

[0020] The raw materials for preparing the silicon-free low-conductivity coolant of the present invention, by mass fraction, include 0.5-1.0% alkanolamine, which in specific embodiments may be 0.06%, 0.07%, 0.08% or 0.09%. The alkanolamine preferably includes one or more of monoethanolamine, diethanolamine, triethanolamine and isopropanolamine.

[0021] By mass fraction, the raw materials for preparing the silicon-free low-conductivity coolant of the present invention include 0.2-0.5% quinoline derivatives, which may be 0.3% or 0.4% in specific embodiments. The quinoline derivatives preferably include one or more of quinoline, 8-hydroxyquinoline and 2-hydroxy-4-methylquinoline.

[0022] The raw materials for preparing the silicon-free, low-conductivity coolant of the present invention, by mass fraction, include 0.1-0.2% azole derivatives, which in specific embodiments may be 0.14%, 0.15%, 0.16%, or 0.18%. The azole derivatives preferably include one or more of benzotriazole and methylbenzotriazole. When the azole derivatives are methylbenzotriazole and benzotriazole, the mass ratio of methylbenzotriazole to benzotriazole is preferably 1:1.

[0023] The raw materials for preparing the silicon-free, low-conductivity coolant of the present invention, by mass fraction, include 1.0-5.0% polyethylene glycol, which in specific embodiments may be 2%, 3% or 4%. The polyethylene glycol preferably includes one or more of PEG-400, PEG-600, PEG-800 and PEG-1000.

[0024] By mass fraction, the raw materials for preparing the silicon-free, low-conductivity coolant of the present invention include 40-55% ethylene glycol, which in specific embodiments can be 42%, 45%, 48%, 50%, or 52%.

[0025] The raw materials for preparing the silicon-free, low-conductivity coolant of the present invention, by mass fraction, include 100-200 ppm of defoamer, preferably including polyether defoamer.

[0026] The raw materials for preparing the silicon-free, low-conductivity coolant of the present invention, by mass fraction, include 100-200 ppm of colorant, preferably one or more of tartrazine, quinoline yellow, brilliant blue, and rose red 777.

[0027] The present invention also provides a method for preparing the silicon-free, low-conductivity coolant described in the above technical solution, comprising the following steps: Ethylene glycol is mixed with a portion of water and an alkanolamine in sequence. The resulting mixture is then mixed with a dibasic organic acid, a quinoline derivative, an azole derivative, and polyethylene glycol for a saponification reaction. The resulting system is then mixed with the remaining water to obtain the silicon-free, low-conductivity coolant. When the raw materials for preparing the silicon-free, low-conductivity coolant also include defoamers and colorants, the preparation method includes the following steps: Ethylene glycol is mixed with a portion of water and an alkanolamine in sequence. The resulting mixture is then mixed with a dibasic organic acid, a quinoline derivative, an azole derivative, and polyethylene glycol for a saponification reaction. The resulting system is then mixed with an antifoaming agent, a coloring agent, and the remaining water to obtain the silicon-free, low-conductivity coolant.

[0028] In this invention, the saponification reaction is preferably carried out at room temperature and for a duration of 30 minutes.

[0029] In the saponification reaction, alcohol amines react with dibasic organic acids to form esters.

[0030] In this invention, the mass of the water portion is preferably 15-25% of the total mass of the water, more preferably 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23% or 24%.

[0031] The present invention also provides the application of the silicon-free, low-conductivity coolant described in the above technical solution in electric vehicles.

[0032] The following detailed description, in conjunction with embodiments, illustrates the silicon-free low-conductivity coolant, its preparation method, and its applications provided by the present invention. However, these descriptions should not be construed as limiting the scope of protection of the present invention.

[0033] Example 1 To produce 1 ton of silicon-free, low-conductivity coolant: At room temperature, first add 400 kg of ethylene glycol and 100 kg of softened water to a reactor. Then, sequentially add 5 kg of triethanolamine, 0.5 kg of sebacic acid, 2 kg of quinoline, 1.5 kg of benzotriazole, and 30 kg of PEG-800 polyethylene glycol, stirring for 30 minutes until completely dissolved. Add 100 g of polyether defoamer EC210 and 100 g of lemon yellow, and replenish the remaining softened water. Continue stirring for 20 minutes until the color is uniform and transparent. Filter into a finished product tank and dispense to obtain the finished product.

[0034] Example 2 To produce 1 ton of silicon-free, low-conductivity coolant: At room temperature, first add 550 kg of ethylene glycol and 100 kg of softened water to a reactor. Then, sequentially add 8 kg of monoethanolamine, 1 kg of adipic acid, 3 kg of 5-nitroquinoline, 2 kg of methylbenzotriazole, and 40 kg of PEG-600 polyethylene glycol, stirring for 30 minutes until completely dissolved. Add 100 g of polyether defoamer EC210 and 100 g of lemon yellow, and replenish the remaining softened water. Continue stirring for 20 minutes until the color is uniform and transparent. Filter into a finished product tank and dispense to obtain the finished product.

[0035] Example 3 To produce 1 ton of silicon-free, low-conductivity coolant: At room temperature, first add 500 kg of ethylene glycol and 100 kg of softened water to a reactor. Then, sequentially add 10 kg of isopropanolamine, 0.8 kg of succinic acid, 5 kg of 2-hydroxy-4-methylquinoline, 1 kg of benzotriazole, and 10 kg of PEG-1000 polyethylene glycol, stirring for 30 minutes until completely dissolved. Add 100 g of polyether defoamer EC210 and 100 g of lemon yellow, and replenish the remaining softened water. Continue stirring for 20 minutes until the color is uniform and transparent. Filter into a finished product tank and dispense to obtain the finished product.

[0036] Example 4 To produce 1 ton of silicon-free, low-conductivity coolant: At room temperature, first add 450 kg of ethylene glycol and 100 kg of softened water to a reactor. Then, sequentially add 5 kg of diethanolamine, 1 kg of sebacic acid, 4 kg of 8-hydroxyquinoline, 1 kg of methylbenzotriazole, and 50 kg of PEG-400 polyethylene glycol, stirring for 30 minutes until completely dissolved. Add 100 g of polyether defoamer EC210 and 100 g of lemon yellow, and replenish the remaining softened water. Continue stirring for 20 minutes until the color is uniform and transparent. Filter into a finished product tank and dispense to obtain the finished product.

[0037] Example 5 To produce 1 ton of silicon-free, low-conductivity coolant: At room temperature, first add 520 kg of ethylene glycol and 100 kg of softened water to a reactor. Then, sequentially add 5 kg of triethanolamine, 0.5 kg of adipic acid, 2 kg of quinoline, 1 kg of methylbenzotriazole, 1 kg of benzotriazole, and 50 kg of PEG-800 polyethylene glycol, stirring for 30 minutes until completely dissolved. Add 100 g of polyether defoamer EC210 and 100 g of lemon yellow, and replenish the remaining softened water. Continue stirring for 20 minutes until the color is uniform and transparent. Filter into a finished product tank and dispense to obtain the finished product.

[0038] Comparative Example 1 The only difference from Example 1 is that quinoline was not added.

[0039] Comparative Example 2 The only difference from Example 1 is that benzotriazole was not added.

[0040] Comparative Example 3 The only difference from Example 1 is that sebacic acid was not added.

[0041] Comparative Example 4 The only difference from Example 1 is that polyethylene glycol was not added.

[0042] Comparative Example 5 The only difference from Example 1 is that triethanolamine was not added.

[0043] It cannot be saponified, the solution is cloudy, and products cannot be produced.

[0044] The finished products obtained in each embodiment and comparative example were tested for performance according to national standard GB 29743.2. The results are shown in Tables 1 and 2.

[0045] Table 1. Performance test results of silicon-free low-conductivity coolants in Examples 1-5

[0046] Table 2 Performance test results of silicon-free low-conductivity coolants in Comparative Examples 1-5

[0047] As shown in Tables 1 and 2, the synergistic effect of the raw materials in the coolant of the present invention enables the coolant to maintain excellent anti-corrosion performance under the premise of low conductivity <100μS / cm.

[0048] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A silicon-free, low-conductivity coolant, characterized in that, The following raw materials are included by mass fraction: Dibasic organic acids 0.05-0.1%, alkanolamines 0.5-1.0%, quinoline derivatives 0.2-0.5%, azole derivatives 0.1-0.2%, polyethylene glycol 1.0-5.0%, ethylene glycol 40-55%, and the balance being water.

2. The silicon-free, low-conductivity coolant according to claim 1, characterized in that, The following raw materials are included by mass fraction: Dibasic organic acids 0.06-0.09%, alkanolamines 0.6-0.9%, quinoline derivatives 0.3-0.45%, azole derivatives 0.12-0.18%, polyethylene glycol 1.5-4%, ethylene glycol 45-50%, and the balance being water.

3. The silicon-free, low-conductivity coolant according to claim 1, characterized in that, The dicarboxylic organic acids include one or more of sebacic acid, adipic acid, and succinic acid.

4. The silicon-free, low-conductivity coolant according to claim 1, characterized in that, The alkanolamines include one or more of monoethanolamine, diethanolamine, triethanolamine, and isopropanolamine.

5. The silicon-free, low-conductivity coolant according to claim 1, characterized in that, The quinoline derivatives include one or more of quinoline, 8-hydroxyquinoline, and 2-hydroxy-4-methylquinoline.

6. The silicon-free, low-conductivity coolant according to claim 1, characterized in that, The azole derivatives include one or more of benzotriazole and methylbenzotriazole.

7. The silicon-free, low-conductivity coolant according to claim 1, characterized in that, The polyethylene glycol includes one or more of PEG-400, PEG-600, PEG-800 and PEG-1000.

8. The silicon-free, low-conductivity coolant according to any one of claims 1 to 7, characterized in that, By mass fraction, the silicon-free low-conductivity coolant also includes the following raw materials: 100 ppm defoamer and 100 ppm colorant; The defoamer includes a polyether defoamer; the colorant includes one or more of lemon yellow, quinoline yellow, brilliant blue, and rose red 777.

9. A method for preparing the silicon-free, low-conductivity coolant according to any one of claims 1 to 8, characterized in that, Includes the following steps: Ethylene glycol is mixed with a portion of water and an alkanolamine in sequence. The resulting mixture is then mixed with a dibasic organic acid, a quinoline derivative, an azole derivative, and polyethylene glycol for a saponification reaction. The resulting system is then mixed with the remaining water to obtain the silicon-free, low-conductivity coolant. When the raw materials for preparing the silicon-free, low-conductivity coolant also include defoamers and colorants, the preparation method includes the following steps: Ethylene glycol is mixed with a portion of water and an alkanolamine in sequence. The resulting mixture is then mixed with a dibasic organic acid, a quinoline derivative, an azole derivative, and polyethylene glycol for a saponification reaction. The resulting system is then mixed with an antifoaming agent, a coloring agent, and the remaining water to obtain the silicon-free, low-conductivity coolant.

10. The application of the silicon-free low-conductivity coolant according to any one of claims 1 to 8 or the silicon-free low-conductivity coolant prepared by the preparation method according to claim 9 in electric vehicles.

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