CN114672287A - High-corrosion-inhibition low-conductivity heat transfer medium and preparation method and application thereof - Google Patents
High-corrosion-inhibition low-conductivity heat transfer medium and preparation method and application thereof Download PDFInfo
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/20—Antifreeze additives therefor, e.g. for radiator liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
Abstract
The application relates to the technical field of heat transfer media, and particularly discloses a high-corrosion-inhibition low-conductivity heat transfer medium, a preparation method and application thereof, wherein the heat transfer medium is mainly prepared from the following raw materials in parts by weight: 400 parts of C2-C4 dihydric alcohol, 150 parts of water, 60-70 parts of triethanolamine, 4-8 parts of isomeric alcohol polyoxyethylene ether, 2-4 parts of amido gemini quaternary ammonium salt, 1-3 parts of ethylene diamine tetramethylene sodium phosphonate, 1-2 parts of hydrophilic modified polysiloxane, 1-2 parts of pyridinium compound, 1-10 parts of low-conductivity solid filler and 10-20 parts of dispersing agent. The heat transfer medium has the advantages of high corrosion inhibition and low conductivity through the synergistic effect of the raw materials, and simultaneously has good stability, thereby meeting the market demand.
Description
Technical Field
The application relates to the technical field of heat transfer media, in particular to a heat transfer medium with high corrosion inhibition and low conductivity, a preparation method and application thereof.
Background
With the development and application of new energy automobiles, the automobile industry gradually moves into the "oil-free" era. The core power component of the new energy automobile is a power battery, the power battery inevitably releases a large amount of heat in the charging and discharging process, and at the moment, a cooling system needs to be equipped, and the temperature of the power battery is controlled by the cooling system, so that the service life of the power battery is prolonged.
In the prior art, a cooling system generally adopts cooling liquid, the raw materials of the cooling liquid comprise glycol, water, benzotriazole, sodium hydroxide, metal powder and a dispersing agent, and the raw materials are uniformly mixed to obtain the cooling liquid. The metal powder is added into the raw material of the cooling liquid, and the metal powder is utilized to improve the heat conductivity coefficient of the cooling liquid and accelerate the heat conduction of the cooling liquid. However, in practical applications, the applicant found that the coolant has high electrical conductivity and is prone to corrode metal materials when used for a long time, and the corrosion inhibition of the coolant still needs to be improved.
Disclosure of Invention
In order to improve the corrosion inhibition effect of the heat transfer medium on the basis of keeping the heat transfer medium to have lower conductivity, the application provides the heat transfer medium with high corrosion inhibition and low conductivity, and a preparation method and application thereof.
In a first aspect, the present application provides a heat transfer medium with high corrosion inhibition and low conductivity, which adopts the following technical scheme: a heat transfer medium with high corrosion inhibition and low conductivity is mainly prepared from the following raw materials in parts by weight: 400 parts of C2-C4 dihydric alcohol 300-400 parts, 150 parts of water 100-150 parts, 60-70 parts of triethanolamine, 4-8 parts of isomeric alcohol polyoxyethylene ether, 2-4 parts of amido gemini quaternary ammonium salt, 1-3 parts of ethylene diamine tetramethylene sodium phosphonate, 1-2 parts of hydrophilic modified polysiloxane, 1-2 parts of pyridinium compound, 1-10 parts of low-conductivity solid filler and 10-20 parts of dispersing agent;
and, the structural formula of the pyridinium compound is:
the high-corrosion-inhibition low-conductivity heat transfer medium has high corrosion inhibition performance through the synergistic effect of the raw materials, the mass change of carbon steel is less than 1 mg/sheet, the mass change of cast iron is less than 4.5 mg/sheet, and the mass change of cast aluminum is less than 2.5 mg/sheet. Meanwhile, the composite material also has lower conductivity and higher stability, the breakdown voltage is more than 170Kv/cm, and the viscosity change rate of the heat transfer medium is less than 3 percent after 1000 times of power battery charge-discharge cycles. Therefore, the heat transfer medium has higher corrosion inhibition effect and stability on the basis of keeping lower conductivity, so that the heat transfer medium shows good overall effect and meets the market demand.
The heat transfer medium takes C2-C4 dihydric alcohol as a base material, and has good fluidity. Water is added into the raw materials, so that the freezing point of the heat transfer medium can be effectively reduced, and the application range of the heat transfer medium is enlarged. The triethanolamine is added, so that the acidification of the C2-C4 dihydric alcohol can be effectively reduced, and the alkalinity of the heat transfer medium is increased by combining other raw materials.
The isomerous alcohol polyoxyethylene ether and the amido gemini quaternary ammonium salt are added into the raw materials, and the compatibility and the dispersion stability of the raw materials are effectively improved by utilizing the synergistic effect of the isomerous alcohol polyoxyethylene ether and the amido gemini quaternary ammonium salt. The ethylenediamine tetramethylene phosphonic acid sodium, the hydrophilic modified polysiloxane and the pyridinium compound are added, and the synergistic effect of the ethylenediamine tetramethylene phosphonic acid sodium, the hydrophilic modified polysiloxane and the pyridinium compound is utilized, so that the heat transfer medium has good corrosion inhibition effect on carbon steel, cast iron and cast aluminum.
The dispersing agent is added into the raw materials, so that the deposition of the deposits on the surface of the metal material is reduced, the dispersion stability of the heat transfer medium is improved, and the dispersion stability of the heat transfer medium is further improved by combining the isomeric alcohol polyoxyethylene ether and the amido gemini quaternary ammonium salt.
The low-conductivity solid filler is added into the raw materials to increase the fluidity of the heat transfer medium, and the corrosion inhibition effect of the heat transfer medium is further improved by combining the ethylenediamine tetramethylene phosphonic acid sodium, the hydrophilic modified polysiloxane and the pyridinium compound. And the low-conductivity solid filler also reduces the deposition of the precipitate on the surface of the metal material, and further improves the dispersion stability of the heat transfer medium by combining a dispersing agent, isomeric alcohol polyoxyethylene ether and amido gemini quaternary ammonium salt.
Optionally, the pyridinium compound is prepared by the following method:
s1, heating the organic solvent to 75-80 ℃, adding 1,2,4, 5-tetra (bromomethyl) benzene and pyridine-4-ethyl formate, stirring for reaction for 70-80h, cooling, filtering and drying to obtain a primary finished product;
s2, heating water to 75-80 ℃, then adding concentrated hydrochloric acid, mixing uniformly, then adding the primary product, stirring and reacting for 20-30h, cooling, filtering and drying to obtain a semi-finished product;
and S3, heating water to 75-80 ℃, adding the semi-finished product, uniformly mixing, adding sodium hydroxide, stirring for reacting for 5-10h, evaporating for concentration, cooling, filtering and drying to obtain the pyridinium compound.
By adopting the technical scheme, the pyridinium compound is obtained by firstly utilizing the replacement reaction between 1,2,4, 5-tetra (bromomethyl) benzene and pyridine-4-ethyl formate, then carrying out ester hydrolysis reaction under the action of hydrochloric acid, and then carrying out neutralization reaction under the action of sodium hydroxide. The preparation method is simple and convenient to prepare and convenient to control.
Further, the organic solvent is one or more of acetonitrile, tetrahydrofuran, dimethyl sulfoxide and dimethylformamide. Preferably, the organic solvent is acetonitrile.
Optionally, the weight ratio of the 1,2,4, 5-tetra (bromomethyl) benzene to the pyridine-4-ethyl formate to the concentrated hydrochloric acid to the sodium hydroxide is 10 (13-14) to (40-50) to (15-20).
Optionally, in step S1, the weight ratio of the organic solvent to the 1,2,4, 5-tetra (bromomethyl) benzene is (100) -150) to 10; in step S2, the weight ratio of water to 1,2,4, 5-tetra (bromomethyl) benzene is (30-40) to 10;
in step S3, the weight ratio of water to 1,2,4, 5-tetra (bromomethyl) benzene is (80-100): 10.
By adopting the technical scheme, the raw material proportion of the pyridinium compound is optimized, the yield of the pyridinium compound is improved, and the using effect of the pyridinium compound is also improved.
Optionally, the hydrophilic modified polysiloxane is an amino modified polysiloxane.
By adopting the technical scheme, the amino modified polysiloxane has good corrosion inhibition on metal materials, also has good compatibility with raw materials, and improves the dispersion stability of the heat transfer medium. Compared with hydroxyl modified polysiloxane, amino modified polysiloxane contains amino, which can increase alkalinity of heat transfer medium, improve corrosion inhibition of heat transfer medium, and improve stability of heat transfer medium.
Optionally, the low conductive solid filler is silica.
By adopting the technical scheme, the silicon dioxide is an atomic crystal, and the silicon atom and the oxygen atom are connected in a covalent bond mode, so that free electrons do not exist in the silicon dioxide and the silicon dioxide is almost non-conductive. And silica is added into the heat transfer medium, so that the fluidity of the heat transfer medium can be increased, the friction effect on the surface of the metal material can be realized, and the deposition of precipitates on the surface of the metal material is reduced. Compared with ceramic powder, the silicon dioxide not only can increase the breakdown voltage of the heat transfer medium and reduce the conductivity of the heat transfer medium, but also can be stably dispersed in the heat transfer medium, so that the corrosion inhibition of the heat transfer medium is improved.
Optionally, the dispersant is a maleic acid-acrylic acid copolymer.
Optionally, the C2-C4 dihydric alcohol is one of ethylene glycol and propylene glycol.
By adopting the technical scheme, the dispersing agent and the C2-C4 dihydric alcohol are optimized, so that the preparation of the heat transfer medium is facilitated, and the stability of the heat transfer medium is also improved.
In a second aspect, the present application provides a method for preparing the above heat transfer medium with high corrosion inhibition and low conductivity, which adopts the following technical scheme:
a preparation method of the heat transfer medium with high corrosion inhibition and low conductivity comprises the step of uniformly mixing C2-C4 dihydric alcohol, water, triethanolamine, isomeric alcohol polyoxyethylene ether, amido gemini quaternary ammonium salt, ethylene diamine tetramethylene sodium phosphonate, hydrophilic modified polysiloxane, a pyridinium compound, a low-conductivity solid filler and a dispersing agent according to a weight ratio to obtain the heat transfer medium.
By adopting the technical scheme, the preparation of the heat transfer medium is facilitated.
In a third aspect, the application provides an application of the heat transfer medium with high corrosion inhibition and low conductivity in a new energy automobile cooling liquid.
In summary, the present application has the following beneficial effects:
1. according to the high-corrosion-inhibition low-conductivity heat transfer medium, the ethylenediamine tetramethylene phosphonic acid sodium, the hydrophilic modified polysiloxane and the pyridinium compound are added into the raw materials, and the corrosion inhibition of the heat transfer medium is improved by utilizing the synergistic effect of the ethylenediamine tetramethylene phosphonic acid sodium, the hydrophilic modified polysiloxane and the pyridinium compound. The low-conductivity solid filler is added into the raw materials, so that the heat transfer medium is kept at low conductivity, and the corrosion inhibition of the heat transfer medium can be improved. Therefore, the heat transfer medium has higher corrosion inhibition effect on the basis of keeping lower conductivity, so that the heat transfer medium shows good overall effect and meets the market demand.
2. The preparation method of the pyridinium compound firstly carries out a replacement reaction, then carries out an ester hydrolysis reaction, and then carries out a neutralization reaction to obtain the pyridinium compound, so that the preparation method has the advantages of simplicity and convenience in preparation and control.
3. The hydrophilic modified polysiloxane is amino modified polysiloxane; the low-conductivity solid filler is silicon dioxide, and the hydrophilic modified polysiloxane and the low-conductivity solid filler are optimized, so that the corrosivity of the heat transfer medium is improved, the conductivity of the heat transfer medium is reduced, and the overall effect of the heat transfer medium is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example
A pyridinium compound having the formula:
preparation example 1
A pyridinium compound prepared by the following method:
s1, heating 120kg of organic solvent to 80 ℃. Then adding 1,2,4, 5-tetra (bromomethyl) benzene and pyridine-4-ethyl formate, and stirring to react for 75 hours. Cooling to 25 ℃, filtering and drying to obtain a primary finished product.
And the organic solvent is acetonitrile.
The weight ratio of the organic solvent, the 1,2,4, 5-tetra (bromomethyl) benzene and the pyridine-4-ethyl formate is 120:10: 13.5.
S2, heating water to 80 ℃, then adding concentrated hydrochloric acid, and mixing uniformly. Then adding the primary product, and stirring to react for 25 h. Cooling to 25 deg.C, filtering, and drying to obtain semi-finished product.
And the weight ratio of the water, the concentrated hydrochloric acid and the 1,2,4, 5-tetra (bromomethyl) benzene is 35:45: 10.
S3, heating the water to 80 ℃, adding the semi-finished product, and mixing uniformly. Then, sodium hydroxide is added, and the reaction is stirred for 8 hours. Evaporated to 1/5 in bulk. Cooling to 25 ℃, filtering and drying to obtain the pyridinium compound.
And the weight ratio of the water to the sodium hydroxide to the 1,2,4, 5-tetra (bromomethyl) benzene is 90:18: 10.
Examples
TABLE 1 Heat-transfer medium content of each raw material (unit: g)
| Examples | Example 1 | Example 2 | Example 3 |
| C2-C4 dihydric alcohol | 350 | 300 | 400 |
| Water (W) | 125 | 100 | 150 |
| Triethanolamine | 65 | 70 | 60 |
| Isomeric alcohol polyoxyethylene ethers | 6 | 8 | 4 |
| Amido gemini quaternary ammonium salts | 3 | 2 | 4 |
| Ethylenediaminetetramethylenephosphonic acid sodium salt | 2 | 1 | 3 |
| Hydrophilically modified polysiloxanes | 1.5 | 2 | 1 |
| Pyridinium compound | 1.5 | 2 | 1 |
| Low-conductive solid filler | 5 | 10 | 1 |
| Dispersing agent | 15 | 20 | 10 |
Example 1
The raw material proportion of the heat transfer medium with high corrosion inhibition and low conductivity is shown in table 1.
Wherein, the dihydric alcohol C2-C4 is glycol; the isomeric alcohol polyoxyethylene ether is isomeric tridecanol polyoxyethylene ether and is selected from Hubei Woded chemical Co., Ltd; the amido gemini quaternary ammonium salt is CS-A6, and is selected from Hubei Woded chemical industry Co., Ltd; the hydrophilic modified polysiloxane is amino modified polysiloxane and is selected from Hubei energy chemical technology limited company; the low-conductivity solid filler is silicon dioxide and is selected from Shijiazhuang Lin mineral products, Inc.; the dispersant is maleic acid-acrylic acid copolymer and is selected from Hubei energy chemical technology limited company; the pyridinium compound was prepared according to preparation example 1.
A preparation method of a heat transfer medium with high corrosion inhibition and low conductivity comprises the following steps: uniformly mixing C2-C4 dihydric alcohol, water, triethanolamine, isomeric alcohol polyoxyethylene ether, amido gemini quaternary ammonium salt, ethylene diamine tetramethylene sodium phosphonate, hydrophilic modified polysiloxane, pyridinium compound, low-conductivity solid filler and dispersant according to a weight ratio to obtain the heat transfer medium.
Examples 2 to 3
The heat transfer medium is different from the heat transfer medium in the raw material ratio shown in the table 1.
Example 4
A heat transfer medium having high corrosion inhibition and low conductivity, which is different from example 1 in that the hydrophilic modified polysiloxane is a hydroxyl modified polysiloxane and is selected from the group consisting of north Hu energy chemical technology ltd.
Example 5
A heat transfer medium with high corrosion inhibition and low conductivity, which is different from example 1 in that the low-conductive solid filler is ceramic powder and is selected from shijiazhuanglin mineral products ltd.
Comparative example
Comparative example 1
The heat transfer medium is characterized in that the raw materials of the heat transfer medium are not added with the ethylenediamine tetramethylene phosphonic acid sodium.
Comparative example 2
The heat transfer medium is different from the heat transfer medium in example 1 in that the hydrophilic modified polysiloxane is not added to the raw material of the heat transfer medium.
Comparative example 3
A heat transfer medium having high corrosion inhibition and low conductivity is distinguished from example 1 in that no pyridinium compound is added to the raw material of the heat transfer medium.
Comparative example 4
The heat transfer medium is characterized in that the heat transfer medium is prepared from raw materials without addition of sodium ethylene diamine tetramethylene phosphonate, hydrophilic modified polysiloxane and pyridinium compound.
Comparative example 5
The difference between the heat transfer medium and the embodiment 1 is that the same amount of benzotriazole is used for replacing ethylene diamine tetramethylene phosphonic acid sodium, hydrophilic modified polysiloxane and pyridinium compound in the raw material of the heat transfer medium.
Comparative example 6
A heat transfer medium having high corrosion inhibition and low conductivity, which is different from example 1 in that a pyridinium compound has a structural formula:
a pyridinium compound prepared by the following method:
s1, heating 120kg of organic solvent to 80 ℃. Then adding 1,2,4, 5-tetra (bromomethyl) benzene and pyridine-4-ethyl formate, and stirring to react for 75 hours. Cooling to 25 ℃, filtering and drying to obtain a primary finished product.
And the organic solvent is acetonitrile.
The weight ratio of the organic solvent, the 1,2,4, 5-tetra (bromomethyl) benzene and the pyridine-4-ethyl formate is 120:10: 13.5.
S2, heating water to 80 ℃, then adding concentrated hydrochloric acid, and mixing uniformly. Then adding the primary product, and stirring to react for 25 h. Cooling to 25 ℃, filtering and drying to obtain the pyridinium compound.
And the weight ratio of the water, the concentrated hydrochloric acid and the 1,2,4, 5-tetra (bromomethyl) benzene is 35:45: 10.
Comparative example 7
A heat transfer medium having high corrosion inhibition and low conductivity, which is different from example 1 in that the pyridinium compound is replaced with an equal amount of pyridinium propanesulfonate in the feed of the heat transfer medium.
Comparative example 8
A heat transfer medium having high corrosion inhibition and low conductivity, which differs from example 1 in that the pyridine salt compound is replaced with an equal amount of 1- (3-pyridyl) -1-propylamine dihydrochloride as the starting material for the heat transfer medium.
Performance test
The heat transfer media obtained in examples 1 to 5 and comparative examples 1 to 8 were used as samples, and the following performance tests were carried out on the samples, and the test results are shown in Table 2.
Wherein, the corrosion inhibition adopts the following method: according to GB29743-2013 motor vehicle engine coolant, a glassware corrosion method is adopted to corrode carbon steel, brass, cast iron and cast aluminum, wherein the corrosion temperature is 100 ℃, and the duration is 336 hours. And the corrosion inhibition of the sample is expressed by the mass change amount, and the smaller the mass change amount is, the higher the corrosion inhibition of the sample is.
The viscosity change rate was determined by the following method: the sample is applied to a new energy automobile battery liquid cooling system, and the viscosity change rate of the sample is detected after 1000 cycles of charging and discharging of a power battery. And the stability of the sample is expressed as a viscosity change rate, and a smaller viscosity change rate indicates a more stable sample.
The following methods were used for the conductivity: and (3) detecting the breakdown voltage of the sample according to GB/T507-2002 insulating oil breakdown voltage test method. And the conductivity of the sample is expressed as the breakdown voltage, and a higher breakdown voltage indicates a poorer conductivity of the sample.
TABLE 2 test results
As can be seen from Table 2, the high corrosion inhibition and low conductivity heat transfer medium of the present application has high corrosion inhibition, the mass of carbon steel is changed to 0.5-0.9 mg/sheet, the mass of cast iron is changed to 2.6-4.2 mg/sheet, and the mass of cast aluminum is changed to 1.2-2.1 mg/sheet. But also has lower conductivity, and the breakdown voltage is 174-212 Kv/cm. Meanwhile, the modified polyvinyl alcohol has higher stability, and the viscosity change rate is 1.7-2.5%. Therefore, the heat transfer medium has a good overall effect and meets the market demand.
Comparing example 1 with comparative examples 1 to 5, it can be seen that, the sodium ethylene diamine tetramethylene phosphonate, the hydrophilic modified polysiloxane and the pyridinium compound are added into the raw materials of the heat transfer medium, and the synergistic effect among the above is utilized to effectively improve the corrosion inhibition and stability of the heat transfer medium and prolong the service life of the metal material.
Comparing example 1 with comparative examples 6-8, it can be seen that the pyridinium compound of the present application, when applied to a heat transfer medium, was superior to the pyridinium compound of comparative example 6 in use effect and also superior to pyridinium propane sulfonate, 1- (3-pyridyl) -1-propylamine dihydrochloride.
Comparing example 1 with example 4, it can be seen that the use effect of the amino-modified polysiloxane is superior to that of the hydroxyl-modified polysiloxane. With reference to example 5, silica was added to the raw material of the heat transfer medium, and the breakdown voltage was 193 Kv/cm; ceramic powder is added into the raw materials of the heat transfer medium, the breakdown voltage is 174Kv/cm, the ceramic powder can increase the conductivity of the heat transfer medium, and the use effect of the silicon dioxide is superior to that of the ceramic powder.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. A heat transfer medium with high corrosion inhibition and low conductivity is characterized in that: the traditional Chinese medicine composition is mainly prepared from the following raw materials in parts by weight: 400 parts of C2-C4 dihydric alcohol 300-400 parts, 150 parts of water 100-150 parts, 60-70 parts of triethanolamine, 4-8 parts of isomeric alcohol polyoxyethylene ether, 2-4 parts of amido gemini quaternary ammonium salt, 1-3 parts of ethylene diamine tetramethylene sodium phosphonate, 1-2 parts of hydrophilic modified polysiloxane, 1-2 parts of pyridinium compound, 1-10 parts of low-conductivity solid filler and 10-20 parts of dispersing agent;
and, the structural formula of the pyridinium compound is:
2. the heat transfer medium of claim 1, wherein the heat transfer medium has high corrosion inhibition and low conductivity, and is characterized in that: the pyridinium compound is prepared by the following method:
s1, heating the organic solvent to 75-80 ℃, adding 1,2,4, 5-tetra (bromomethyl) benzene and pyridine-4-ethyl formate, stirring for reaction for 70-80h, cooling, filtering and drying to obtain a primary finished product;
s2, heating water to 75-80 ℃, adding concentrated hydrochloric acid, mixing uniformly, adding the primary product, stirring to react for 20-30h, cooling, filtering, and drying to obtain a semi-finished product;
and S3, heating water to 75-80 ℃, adding the semi-finished product, uniformly mixing, adding sodium hydroxide, stirring for reacting for 5-10h, evaporating for concentration, cooling, filtering and drying to obtain the pyridinium compound.
3. The heat transfer medium of claim 2, wherein the heat transfer medium has high corrosion inhibition and low conductivity, and further comprises: the weight ratio of the 1,2,4, 5-tetra (bromomethyl) benzene to the pyridine-4-ethyl formate to the concentrated hydrochloric acid to the sodium hydroxide is 10 (13-14) to 40-50 to 15-20.
4. The heat transfer medium of claim 3, wherein the corrosion inhibition is performed by a chemical reaction between: in step S1, the weight ratio of the organic solvent to the 1,2,4, 5-tetra (bromomethyl) benzene is (100) 150) to 10;
in step S2, the weight ratio of water to 1,2,4, 5-tetra (bromomethyl) benzene is (30-40) to 10;
in step S3, the weight ratio of water to 1,2,4, 5-tetra (bromomethyl) benzene is (80-100): 10.
5. The heat transfer medium of claim 1, wherein the heat transfer medium has high corrosion inhibition and low conductivity, and is characterized in that: the hydrophilic modified polysiloxane is amino modified polysiloxane.
6. The heat transfer medium of claim 1, wherein the heat transfer medium has high corrosion inhibition and low conductivity, and is characterized in that: the low-conductivity solid filler is silicon dioxide.
7. The heat transfer medium of claim 1, wherein the heat transfer medium has high corrosion inhibition and low conductivity, and is characterized in that: the dispersant is a maleic acid-acrylic acid copolymer.
8. The heat transfer medium of claim 1, wherein the heat transfer medium has high corrosion inhibition and low conductivity, and further comprises: the C2-C4 dihydric alcohol is one of ethylene glycol and propylene glycol.
9. A method for preparing a heat transfer medium of high corrosion inhibition and low conductivity according to any one of claims 1 to 8, characterized in that: uniformly mixing C2-C4 dihydric alcohol, water, triethanolamine, isomeric alcohol polyoxyethylene ether, amido gemini quaternary ammonium salt, ethylene diamine tetramethylene sodium phosphonate, hydrophilic modified polysiloxane, pyridinium compound, low-conductivity solid filler and dispersant according to a weight ratio to obtain the heat transfer medium.
10. Use of a high corrosion inhibiting low conductivity heat transfer medium according to any one of claims 1-8 in a new energy automobile coolant.
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