CN114672287B - 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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- CN114672287B CN114672287B CN202210338306.2A CN202210338306A CN114672287B CN 114672287 B CN114672287 B CN 114672287B CN 202210338306 A CN202210338306 A CN 202210338306A CN 114672287 B CN114672287 B CN 114672287B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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: 300-400 parts of C2-C4 dihydric alcohol, 100-150 parts of water, 60-70 parts of triethanolamine, 4-8 parts of isomeric alcohol polyoxyethylene ether, 2-4 parts of amide gemini quaternary ammonium salt, 1-3 parts of ethylenediamine 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 steps into the oil-free age. The core power component of the new energy automobile is a power battery, and the power battery inevitably releases a large amount of heat in the charging and discharging process, and a cooling system is needed to be equipped at the moment, and the temperature of the power battery is controlled by the cooling system, so that the service life of the power battery is prolonged.
The cooling system in the prior art 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. Metal powder is added into the raw materials of the cooling liquid, and the heat conductivity coefficient of the cooling liquid is improved by using the metal powder, so that the heat conduction of the cooling liquid is accelerated. However, in practical application, the applicant has found that the cooling liquid has high conductivity, and in the case of long-term use, the cooling liquid is easy to corrode metal materials, and the corrosion inhibition performance of the cooling liquid still needs to be improved.
Disclosure of Invention
The application provides a heat transfer medium with high corrosion inhibition and low conductivity, a preparation method and application thereof, and aims to improve the corrosion inhibition effect on the basis of keeping the heat transfer medium with low conductivity.
In a first aspect, the application provides a heat transfer medium with high corrosion inhibition and low conductivity, which adopts the following technical scheme: the heat transfer medium with high corrosion inhibition and low conductivity is mainly prepared from the following raw materials in parts by weight: 300-400 parts of C2-C4 dihydric alcohol, 100-150 parts of water, 60-70 parts of triethanolamine, 4-8 parts of isomeric alcohol polyoxyethylene ether, 2-4 parts of amide gemini quaternary ammonium salt, 1-3 parts of ethylenediamine 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 heat transfer medium with high corrosion inhibition and low conductivity has higher corrosion inhibition by the synergistic effect of the raw materials, wherein the carbon steel mass change is less than 1 mg/piece, the cast iron mass change is less than 4.5 mg/piece, and the cast aluminum mass change is less than 2.5 mg/piece. Meanwhile, the heat transfer medium 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% after 1000 power battery charge and discharge cycles. Therefore, the heat transfer medium has higher corrosion inhibition effect and stability on the basis of keeping lower conductivity, and the heat transfer medium has good integral effect and meets the market demand.
The heat transfer medium of the application takes C2-C4 dihydric alcohol as a base material and has good fluidity. The 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. By adding triethanolamine, the acidification of the C2-C4 dihydric alcohol can be effectively reduced, and the alkalinity of a heat transfer medium is increased by combining other raw materials.
The isomeric alcohol polyoxyethylene ether and the amido gemini quaternary ammonium salt are added into the raw materials, and the compatibility and dispersion stability of the raw materials are effectively improved by utilizing the synergistic effect between the isomeric alcohol polyoxyethylene ether and the amido gemini quaternary ammonium salt. And the heat transfer medium has good corrosion inhibition effect on carbon steel, cast iron and cast aluminum by utilizing the synergistic effect of the sodium ethylenediamine tetramethylene phosphonate, the hydrophilic modified polysiloxane and the pyridinium compound.
Dispersing agents are added into the raw materials, so that the deposition of sediment 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, so that the fluidity of the heat transfer medium is increased, and the corrosion inhibition effect of the heat transfer medium is further improved by combining the ethylenediamine tetramethylene sodium phosphonate, the hydrophilic modified polysiloxane and the pyridinium compound. And the low-conductivity solid filler also reduces the deposition of the sediment on the surface of the metal material, and the dispersion stability of the heat transfer medium is further improved by combining the dispersing agent, the isomeric alcohol polyoxyethylene ether and the amido gemini quaternary ammonium salt.
Alternatively, the pyridinium compound is prepared by the following method:
s1, heating an organic solvent to 75-80 ℃, then adding 1,2,4, 5-tetra (bromomethyl) benzene and pyridine-4-ethyl formate, stirring and reacting for 70-80 hours, cooling, filtering and drying to obtain a primary finished product;
s2, heating water to 75-80 ℃, then adding concentrated hydrochloric acid, uniformly mixing, then adding a primary product, stirring and reacting for 20-30h, cooling, filtering and drying to obtain a semi-finished product;
s3, heating water to 75-80 ℃, then adding the semi-finished product, uniformly mixing, then adding sodium hydroxide, stirring for reaction for 5-10h, evaporating and concentrating, cooling, filtering, and drying to obtain the pyridinium compound.
By adopting the technical scheme, firstly, 1,2,4, 5-tetra (bromomethyl) benzene and pyridine-4-ethyl formate are utilized to carry out displacement reaction, then hydrolysis reaction of ester is carried out under the action of hydrochloric acid, and then neutralization reaction is carried out under the action of sodium hydroxide, so as to obtain the pyridine salt compound. The preparation method of the application has simple preparation and convenient 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, pyridine-4-ethyl formate, concentrated hydrochloric acid and sodium hydroxide is 10 (13-14) (40-50) (15-20).
Optionally, in the step S1, the weight ratio of the organic solvent to the 1,2,4, 5-tetra (bromomethyl) benzene is (100-150): 10; in the step S2, the weight ratio of the water to the 1,2,4, 5-tetra (bromomethyl) benzene is (30-40) 10;
in the step S3, the weight ratio of the water to the 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 use 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, has good compatibility with raw materials, and improves the dispersion stability of the heat transfer medium. Compared with hydroxyl modified polysiloxane, the amino modified polysiloxane contains amino, so that the alkalinity of the heat transfer medium can be increased, the corrosion inhibition of the heat transfer medium can be improved, and the stability of the heat transfer medium can be improved.
Optionally, the low-conductivity solid filler is silicon dioxide.
By adopting the technical scheme, the silicon dioxide is an atomic crystal, and the silicon atoms and the oxygen atoms are connected in a covalent bond mode, so that free electrons are not in the silicon dioxide, and the silicon dioxide is hardly conductive. And silicon dioxide 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 achieved, and the deposition of sediment on the surface of the metal material can be reduced. Compared with ceramic powder, the silicon dioxide can not only increase the breakdown voltage of the heat transfer medium and reduce the conductivity of the heat transfer medium, but also be stably dispersed in the heat transfer medium, so that the corrosion inhibition of the heat transfer medium is improved.
Alternatively, 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 dispersant 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 application provides a preparation method of the heat transfer medium with high corrosion inhibition and low conductivity, which adopts the following technical scheme:
the preparation method of the heat transfer medium with high corrosion inhibition and low conductivity comprises the steps of uniformly mixing C2-C4 dihydric alcohol, water, triethanolamine, isomeric alcohol polyoxyethylene ether, amido gemini quaternary ammonium salt, ethylenediamine tetramethylene sodium phosphonate, hydrophilic modified polysiloxane, pyridinium compound, low-conductivity solid filler and dispersing agent according to weight proportion to obtain the heat transfer medium.
By adopting the technical scheme, the preparation of the heat transfer medium is convenient.
In a third aspect, the application provides an application of the heat transfer medium with high corrosion inhibition and low conductivity in cooling liquid of a new energy automobile.
In summary, the application has the following beneficial effects:
1. according to the heat transfer medium with high corrosion inhibition and low conductivity, the ethylenediamine tetramethylene sodium phosphonate, the hydrophilic modified polysiloxane and the pyridinium compound are added into the raw materials, and the synergistic effect between the materials is utilized to improve the corrosion inhibition of the heat transfer medium. The low-conductivity solid filler is added into the raw materials, so that the heat transfer medium keeps lower 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, and the heat transfer medium has good overall effect and meets the market demand.
2. The preparation method of the pyridinium compound comprises the steps of carrying out a displacement reaction, then carrying out an ester hydrolysis reaction, and then carrying out a neutralization reaction, so as to obtain the pyridinium compound, and the pyridinium compound has the advantages of simple preparation and convenient control.
3. The hydrophilic modified polysiloxane is amino modified polysiloxane; the low-conductivity solid filler is silicon dioxide, hydrophilic modified polysiloxane and the low-conductivity solid filler are optimized, the corrosiveness of the heat transfer medium is improved, and the conductivity of the heat transfer medium is reduced, so that 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 structural 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 and reacting for 75h. Cooling to 25 ℃, filtering and drying to obtain a primary product.
And the organic solvent is acetonitrile.
The weight ratio of the organic solvent to the 1,2,4, 5-tetra (bromomethyl) benzene to the pyridine-4-ethyl formate is 120:10:13.5.
S2, heating water to 80 ℃, then adding concentrated hydrochloric acid, and uniformly mixing. And then adding the primary product, and stirring and reacting for 25h. Cooling to 25deg.C, filtering, and drying to obtain semi-finished product.
And the weight ratio of water to concentrated hydrochloric acid to 1,2,4, 5-tetra (bromomethyl) benzene is 35:45:10.
And S3, heating the water to 80 ℃, then adding the semi-finished product, and uniformly mixing. Then sodium hydroxide is added and the reaction is stirred for 8 hours. Evaporating and concentrating to 1/5 of the original volume. Cooling to 25 ℃, filtering and drying to obtain the pyridinium compound.
And the weight ratio of water to sodium hydroxide to 1,2,4, 5-tetra (bromomethyl) benzene is 90:18:10.
Examples
TABLE 1 Heat transfer Medium raw Material contents (Unit: g)
| Examples | Example 1 | Example 2 | Example 3 |
| C2-C4 diols | 350 | 300 | 400 |
| Water and its preparation method | 125 | 100 | 150 |
| Triethanolamine salt | 65 | 70 | 60 |
| Isomeric alcohol polyoxyethylene ether | 6 | 8 | 4 |
| Amide gemini quaternary ammonium salt | 3 | 2 | 4 |
| Ethylenediamine tetramethylene phosphonic acid sodium salt | 2 | 1 | 3 |
| Hydrophilic modified polysiloxanes | 1.5 | 2 | 1 |
| Pyridine salt compound | 1.5 | 2 | 1 |
| Low-conductivity solid filler | 5 | 10 | 1 |
| Dispersing agent | 15 | 20 | 10 |
Example 1
The heat transfer medium with high corrosion inhibition and low conductivity has the raw materials with the proportions shown in table 1.
Wherein the C2-C4 dihydric alcohol is ethylene glycol; the isomeric alcohol polyoxyethylene ether is isomeric tridecanol polyoxyethylene ether and is selected from Hubei Korea chemical industry limited company; the amido gemini quaternary ammonium salt is CS-A6 and is selected from Hubei Korea chemical industry Co., ltd; the hydrophilic modified polysiloxane is amino modified polysiloxane, and is selected from Hubei Shi chemical engineering Co.Ltd; the low-conductivity solid filler is silicon dioxide and is selected from Shijia Zhi Lin mineral products Limited company; the dispersant is a maleic acid-acrylic acid copolymer and is selected from Hubei chemical engineering limited company; the pyridinium compound was prepared by using 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, ethylenediamine tetramethylene sodium phosphonate, hydrophilic modified polysiloxane, pyridinium compound, low-conductivity solid filler and dispersing agent according to a weight ratio to obtain a heat transfer medium.
Examples 2 to 3
A heat transfer medium with high corrosion inhibition and low conductivity is different from example 1 in that the raw material ratio of the heat transfer medium is different, and the raw material ratio of the heat transfer medium is shown in Table 1.
Example 4
A heat transfer medium with high corrosion inhibition and low conductivity is distinguished from example 1 in that the hydrophilic modified polysiloxane is a hydroxyl modified polysiloxane and is selected from Hubei chemical engineering Co.
Example 5
A heat transfer medium with high corrosion inhibition and low conductivity is different from the embodiment 1 in that the low-conductivity solid filler is ceramic powder and is selected from Shijia Zhi Lin mineral products Limited.
Comparative example
Comparative example 1
A heat transfer medium with high corrosion inhibition and low conductivity is different from the heat transfer medium in that the raw material of the heat transfer medium is not added with ethylenediamine tetramethylene sodium phosphonate.
Comparative example 2
A heat transfer medium with high corrosion inhibition and low conductivity is different from the heat transfer medium in that hydrophilic modified polysiloxane is not added in the raw materials of the heat transfer medium.
Comparative example 3
A heat transfer medium of high corrosion inhibition and low conductivity is distinguished from example 1 in that a pyridinium compound is not added to the raw material of the heat transfer medium.
Comparative example 4
A heat transfer medium with high corrosion inhibition and low conductivity is different from the heat transfer medium in that ethylenediamine tetramethylene sodium phosphonate, hydrophilic modified polysiloxane and pyridinium compound are not added into the raw materials of the heat transfer medium.
Comparative example 5
A heat transfer medium with high corrosion inhibition and low conductivity is different from the heat transfer medium in that equal amounts of benzotriazole are used for replacing ethylenediamine tetramethylene sodium phosphonate, hydrophilic modified polysiloxane and pyridinium compound in the raw materials of the heat transfer medium.
Comparative example 6
A high corrosion inhibition low conductivity heat transfer medium which differs from example 1 in that the pyridinium compound has the 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 and reacting for 75h. Cooling to 25 ℃, filtering and drying to obtain a primary product.
And the organic solvent is acetonitrile.
The weight ratio of the organic solvent to the 1,2,4, 5-tetra (bromomethyl) benzene to the pyridine-4-ethyl formate is 120:10:13.5.
S2, heating water to 80 ℃, then adding concentrated hydrochloric acid, and uniformly mixing. And then adding the primary product, and stirring and reacting for 25h. Cooling to 25 ℃, filtering and drying to obtain the pyridinium compound.
And the weight ratio of water to concentrated hydrochloric acid to 1,2,4, 5-tetra (bromomethyl) benzene is 35:45:10.
Comparative example 7
A high corrosion inhibition low conductivity heat transfer medium which differs from example 1 in that the pyridinium compound is replaced by an equivalent amount of pyridinium propane sulfonate in the feed to the heat transfer medium.
Comparative example 8
A high corrosion inhibition low conductivity heat transfer medium which differs from example 1 in that the pyridine salt compound is replaced by an equivalent amount of 1- (3-pyridyl) -1-propanamine dihydrochloride in the feed to the heat transfer medium.
Performance test
The heat transfer mediums 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 Cooling liquid for motor vehicle engines, carbon steel, brass, cast iron and cast aluminum are corroded by adopting a glassware corrosion method, wherein the corrosion temperature is 100 ℃ and the duration is 336 hours. And the corrosion inhibition of the sample is represented 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 as follows: the sample is applied to a new energy automobile battery liquid cooling system, and after 1000 cycles of charging and discharging of a power battery, the viscosity change rate of the sample is detected. And the stability of the sample is expressed in terms of the rate of change of viscosity, and a smaller rate of change of viscosity indicates a more stable sample.
The conductivity is achieved by the following method: and detecting the breakdown voltage of the sample according to GB/T507-2002 insulation oil breakdown voltage test method. And the conductivity of the sample is expressed in terms of breakdown voltage, and a higher breakdown voltage indicates a poorer conductivity of the sample.
TABLE 2 detection results
As can be seen from Table 2, the heat transfer medium of the present application has high corrosion inhibition and low conductivity, the mass of carbon steel is changed to 0.5-0.9 mg/piece, the mass of cast iron is changed to 2.6-4.2 mg/piece, and the mass of cast aluminum is changed to 1.2-2.1 mg/piece. But also has lower conductivity and breakdown voltage of 174-212Kv/cm. Meanwhile, the high-stability high-viscosity water-based paint also has higher stability, and the viscosity change rate is 1.7-2.5%. Therefore, the heat transfer medium has good overall effect and meets the market demand.
Comparing example 1 with comparative examples 1-5, it can be seen that the addition of ethylenediamine tetramethylene sodium phosphonate, hydrophilically modified polysiloxane, and pyridinium compound to the raw materials of the heat transfer medium effectively improves the corrosion inhibition and stability of the heat transfer medium and the service life of the metal material by utilizing the synergistic effect therebetween.
Comparing example 1 with comparative examples 6-8, it can be seen that the use of the pyridinium compound of the present application in a heat transfer medium is superior to the pyridinium compound of comparative example 6 and to pyridinium propane sulfonate, 1- (3-pyridyl) -1-propanamine dihydrochloride.
Comparing example 1 with example 4, it can be seen that the amino-modified polysiloxane is superior to the hydroxy-modified polysiloxane in use. In combination with example 5, silica was added to the starting material of the heat transfer medium, with a breakdown voltage of 193Kv/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 better than that of the ceramic powder.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (6)
1. A high corrosion inhibition low conductivity heat transfer medium, characterized in that: the traditional Chinese medicine is mainly prepared from the following raw materials in parts by weight: 300-400 parts of C2-C4 dihydric alcohol, 100-150 parts of water, 60-70 parts of triethanolamine, 4-8 parts of isomeric alcohol polyoxyethylene ether, 2-4 parts of amide gemini quaternary ammonium salt, 1-3 parts of ethylenediamine 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 pyridinium compound is prepared by the following method:
s1, heating an organic solvent to 75-80 ℃, then adding 1,2,4, 5-tetra (bromomethyl) benzene and pyridine-4-ethyl formate, stirring and reacting for 70-80 hours, cooling, filtering and drying to obtain a primary finished product;
s2, heating water to 75-80 ℃, then adding concentrated hydrochloric acid, uniformly mixing, then adding a primary product, stirring and reacting for 20-30h, cooling, filtering and drying to obtain a semi-finished product;
s3, heating water to 75-80 ℃, then adding the semi-finished product, uniformly mixing, then adding sodium hydroxide, stirring for reaction for 5-10 hours, evaporating and concentrating, cooling, filtering, and drying to obtain a pyridinium compound;
the weight ratio of the 1,2,4, 5-tetra (bromomethyl) benzene, pyridine-4-ethyl formate, concentrated hydrochloric acid and sodium hydroxide is 10 (13-14), 40-50 and 15-20; in the step S1, the weight ratio of the organic solvent to the 1,2,4, 5-tetra (bromomethyl) benzene is (100-150) 10; in the step S2, the weight ratio of the water to the 1,2,4, 5-tetra (bromomethyl) benzene is (30-40) 10; in the step S3, the weight ratio of the water to the 1,2,4, 5-tetra (bromomethyl) benzene is (80-100) 10;
the hydrophilic modified polysiloxane is amino modified polysiloxane.
2. A high corrosion inhibition low conductivity heat transfer medium according to claim 1, wherein: the low-conductivity solid filler is silicon dioxide.
3. A high corrosion inhibition low conductivity heat transfer medium according to claim 1, wherein: the dispersing agent is a maleic acid-acrylic acid copolymer.
4. A high corrosion inhibition low conductivity heat transfer medium according to claim 1, wherein: the C2-C4 dihydric alcohol is one of ethylene glycol and propylene glycol.
5. A method for preparing the high corrosion inhibition low conductivity heat transfer medium according to any one of claims 1 to 4, wherein: uniformly mixing C2-C4 dihydric alcohol, water, triethanolamine, isomeric alcohol polyoxyethylene ether, amido gemini quaternary ammonium salt, ethylenediamine tetramethylene sodium phosphonate, hydrophilic modified polysiloxane, pyridinium compound, low-conductivity solid filler and dispersing agent according to a weight ratio to obtain a heat transfer medium.
6. Use of a heat transfer medium of high corrosion inhibition and low conductivity according to any of claims 1-4 in a cooling fluid for a new energy vehicle.
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| CN114672287A (en) | 2022-06-28 |
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