A high-stability organic coolant and preparation method thereof

Abstract

The present invention provides a high-stability organic coolant and a preparation method thereof, relating to the technical field of coolants. The organic coolant comprises, by weight, 40-45 parts of ultrapure water, 50-55 parts of ethylene glycol, 0.3-0.5 parts of tolyltriazole, 0.8-1 parts of isooctanoic acid, 0.5-1 parts of tetradecanedioic acid, 0.2-0.5 parts of disodium ethylenediaminetetraacetic acid, 0.08-0.15 parts of phenothiazine, 1.0-1.5 parts of triethanolamine, 0.1-0.2 parts of polyether-modified siloxane, and 5.5-6.8 parts of a polyester mixture. The polyester mixture is prepared by mixing dioctyl adipate, glycerol, and tributyl citrate. The preparation method of the high-stability organic coolant includes the steps of preparing the polyester mixture, adding the polyester mixture, adding a corrosion inhibitor, and adding an additive. The high-stability organic cooling liquid of the present invention has excellent stability, low corrosivity and low electrical conductivity.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling liquids, and in particular to a high-stability organic cooling liquid and a preparation method thereof. Background Art

[0002] Despite the availability of numerous formulations in the organic coolant market, precipitation is a common problem during high-temperature testing. In-depth analysis has shown that this problem is likely caused by additive precipitation. This precipitation can easily clog radiators or water pumps, leading to premature failure of the corrosion inhibitor. This failure, in turn, can lead to serious consequences such as metal corrosion and scaling.

[0003] The prior art with publication number CN117467416A discloses an organic motor vehicle coolant and a preparation method thereof. By compounding a defoaming agent with modified β-cyclodextrin and methacrylate, and combining it with a vacuum freeze-drying process to prepare an auxiliary agent, the defoaming performance and conductivity stability of the coolant are significantly improved. However, the solubility problem of long-chain acids is not solved. Reliance on colloidal stabilizers may cause an increase in low-temperature viscosity or a risk of high-temperature precipitation, and the stability of the coolant cannot be effectively improved. The prior art with publication number CN118326401A discloses a compounded corrosion inhibitor and an environmentally friendly coolant. By compounding fatty acids with aromatic corrosion inhibitors, the hard water resistance and anti-scaling performance, as well as the long-term corrosion inhibition ability, are enhanced. However, long-chain carboxylic acid corrosion inhibitors still have the problem of low solubility at high temperatures. Due to the strong intermolecular force, precipitation may occur, resulting in blockage of the heat dissipation system.

[0004] In summary, although the current existing technical solutions have improved certain properties of the coolant to a certain extent, the following technical problems still exist: the coolant has poor stability and is prone to precipitation; the coolant is corrosive to metal containers; and the electrical conductivity is relatively high. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a high-stability organic coolant and a preparation method thereof, and achieves the following invention objectives: improving the stability of the coolant, preventing precipitation, reducing the electrical conductivity, and preventing corrosion of metal containers.

[0006] To achieve the above objectives, the technical solutions adopted are as follows:

[0007] A high-stability organic coolant comprises the following raw materials, measured in parts by weight: 40-45 parts of ultrapure water, 50-55 parts of ethylene glycol, 0.3-0.5 parts of tolutriazole, 0.8-1 parts of isooctanoic acid, 0.5-1 parts of tetradecanedioic acid, 0.2-0.5 parts of disodium ethylenediaminetetraacetate, 0.08-0.15 parts of phenothiazine, 1.0-1.5 parts of triethanolamine, 0.1-0.2 parts of polyether-modified siloxane, and 5.5-6.8 parts of a polyester mixture.

[0008] The polyol mixture is composed of the following raw materials in parts by weight: 1.5-1.8 parts of dioctyl adipate, 2.0-2.5 parts of glycerol, and 2.0-2.5 parts of tributyl citrate.

[0009] The polyether-modified silicone is Shanghai Huiyan HY-7608.

[0010] The present invention also provides a method for preparing a high-stability organic coolant, comprising the following steps:

[0011] Step 1: Preparation of Polyester Mixture

[0012] Mix tributyl citrate and glycerol evenly, heat to 40-45°C, and stir at 200-250 rpm until the mixture becomes clear. Dioctyl adipate is then added to the mixture in three equal portions, with an interval of 5-8 minutes between each addition. Stir until transparent after each addition to obtain a polyester mixture.

[0013] Step 2: Add the polyester mixture

[0014] At room temperature, add ethylene glycol to the reactor, set the reactor speed to 200-250 rpm, add ultrapure water, control the flow rate to 5-10 g / min, and mix evenly; add the polyester mixture to the reactor and stir for 10-15 minutes.

[0015] Step 3: Add corrosion inhibitor

[0016] Heat the reactor to 40-50°C, add methylbenzotriazole, isooctanoic acid, and tetradecanedioic acid, and perform primary stirring. Then, heat the reactor to 60-65°C and perform secondary stirring. The primary stirring speed is 200-250 rpm for 30-40 minutes, and the secondary stirring speed is 300-350 rpm for 60-90 minutes.

[0017] Step 4: Add additives

[0018] Add disodium EDTA and phenothiazine to the reactor and stir until completely dispersed. Add triethanolamine to the reactor and adjust the pH of the solution to 8.8-9.0. Cool the reactor to 30-40°C, add polyether-modified siloxane, and stir at 200-250 rpm for 30-40 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0019] The mechanism of action of this invention is that dioctyl adipate and methylbenzotriazole form intermolecular bonds through van der Waals-dominant interactions, with the hydrophobic stacking of the long octyl chain and the benzene ring as the primary driving force, while the dipole-dipole interaction between the ester group and the heterocycle provides a secondary stabilizing effect. The dipole-dipole interaction between the ester group and the heterocycle influences water solubility in two ways: first, the synergistic effect of the polar groups reduces the interfacial energy between the complex and the aqueous phase, promoting dispersion; second, the ester group's oxygen atom and the nitrogen atom of the nitrogen heterocycle can form hydrogen bonds with water molecules, enhancing solubility. The ortho-hydroxyl groups of glycerol and the carboxyl groups of isooctanoic acid form a six-membered cyclic association structure through double hydrogen bonding (OH…O). This structure disrupts the hydrogen bonding between the carboxyl groups of isooctanoic acid through competition between the hydroxyl and carboxyl groups. The formation of the cyclic structure increases steric hindrance within the isooctanoic acid molecule, thereby inhibiting its crystallization. The ester groups of tributyl citrate and the carboxyl groups of tetradecanedioic acid interact through dipole-dipole interactions, disrupting the orderly arrangement of the carboxyl groups. The butyl side chain of tributyl citrate, through steric hindrance, prevents the orderly stacking of the carbon chains of tetradecanedioic acid, inhibiting crystallization. Furthermore, dioctyl adipate, tributyl citrate, and glycerol, through synergistic intermolecular interactions, form a solubility network that covers the entire polarity range, significantly enhancing the stability of the organic coolant.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) The organic coolant of the present invention has excellent stability. Under the temperature condition of 60°C, it can achieve no precipitation for 672 hours and the color of the coolant does not change significantly.

[0022] (2) The present invention greatly reduces the corrosiveness of the coolant to the metal container and prolongs the service life of the metal container. The corrosiveness to cast aluminum is -0.4~-0.6mg, the corrosiveness to copper is +0.1~+0.2mg, the corrosiveness to cast iron is -0.3~-0.4mg, the corrosiveness to steel is -0.1~-0.2mg, the corrosiveness to solder is +0.6~+0.9mg, and the corrosiveness to brass is +0.1~+0.3mg.

[0023] (3) The organic coolant prepared by the present invention has a low electrical conductivity of 0.21-0.24 μS / cm. Low electrical conductivity means that the coolant has a low degree of ionization and higher stability. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0025] Example 1 A high-stability organic coolant

[0026] A high-stability organic coolant comprises the following raw materials, calculated by weight: 40 parts of ultrapure water, 55 parts of ethylene glycol, 0.3 parts of tolutriazole, 0.8 parts of isooctanoic acid, 0.5 parts of tetradecanedioic acid, 0.2 parts of disodium ethylenediaminetetraacetic acid, 0.08 parts of phenothiazine, 1.0 parts of triethanolamine, 0.1 parts of polyether-modified siloxane, and 5.5 parts of a polyester mixture.

[0027] The raw material composition of the polyol mixture is as follows: 1.5 parts of dioctyl adipate, 2.0 parts of glycerol, and 2.0 parts of tributyl citrate.

[0028] The polyether-modified silicone is Shanghai Huiyan HY-7608.

[0029] A method for preparing a high-stability organic coolant comprises the following steps:

[0030] Step 1: Preparation of Polyester Mixture

[0031] Mix tributyl citrate and glycerol evenly, heat to 40°C, and stir at 250 rpm until clear to obtain a mixed solution. Then, divide dioctyl adipate into three equal parts and add them to the mixed solution three times at a speed of 250 rpm, with an interval of 5 minutes between each addition. After addition, stir until transparent to obtain a polyester mixture.

[0032] Step 2: Add the polyester mixture

[0033] At room temperature, ethylene glycol was added to the reactor, the reactor speed was set to 200 rpm, ultrapure water was added, the flow rate was controlled to 5 g / min, and mixed evenly; the polyester mixture was added to the reactor and stirred for 10 minutes.

[0034] Step 3: Add corrosion inhibitor

[0035] Heat the reactor to 40°C, add methylbenzotriazole, isooctanoic acid, and tetradecanedioic acid, and perform primary stirring. Then, heat the reactor to 60°C and perform secondary stirring. The primary stirring speed is 200 rpm for 30 minutes, and the secondary stirring speed is 300 rpm for 90 minutes.

[0036] Step 4: Add additives

[0037] Add disodium EDTA and phenothiazine to the reactor and stir until completely dispersed. Add triethanolamine to the reactor and adjust the pH of the solution to 8.8. Cool the reactor to 30°C, add polyether-modified siloxane, and stir at 200 rpm for 40 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0038] Example 2 A high-stability organic coolant

[0039] A high-stability organic coolant comprises the following raw materials, calculated by weight: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 parts of tolutriazole, 0.9 parts of isooctanoic acid, 0.8 parts of tetradecanedioic acid, 0.4 parts of disodium ethylenediaminetetraacetic acid, 0.1 parts of phenothiazine, 1.2 parts of triethanolamine, 0.1 parts of polyether-modified siloxane, and 6.4 parts of a polyester mixture.

[0040] The polyester mixture is composed of the following raw materials in parts by weight: 1.6 parts of dioctyl adipate, 2.3 parts of glycerol, and 2.5 parts of tributyl citrate.

[0041] The polyether-modified silicone is Shanghai Huiyan HY-7608.

[0042] A method for preparing a high-stability organic coolant comprises the following steps:

[0043] Step 1: Preparation of Polyester Mixture

[0044] Mix tributyl citrate and glycerol evenly, heat to 40°C, and stir at 250 rpm until clear to obtain a mixed solution. Then, divide dioctyl adipate into three equal parts and add them to the mixed solution three times at a speed of 250 rpm, with an interval of 5 minutes between each addition. After addition, stir until transparent to obtain a polyester mixture.

[0045] Step 2: Add the polyester mixture

[0046] At room temperature, ethylene glycol was added to the reactor, the reactor speed was set to 200 rpm, ultrapure water was added, the flow rate was controlled to 8 g / min, and mixed evenly; the polyester mixture was added to the reactor and stirred for 15 minutes.

[0047] Step 3: Add corrosion inhibitor

[0048] The reactor was heated to 50°C, and tolyltriazole, isooctanoic acid, and tetradecanedioic acid were added to the reactor for primary stirring. The reactor was then heated to 65°C for secondary stirring. The primary stirring speed was 200 rpm for 35 minutes, and the secondary stirring speed was 300 rpm for 80 minutes.

[0049] Step 4: Add additives

[0050] Add disodium EDTA and phenothiazine to the reactor and stir until completely dispersed. Add triethanolamine to the reactor and adjust the pH of the solution to 8.9. Cool the reactor to 35°C, add polyether-modified siloxane, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0051] Example 3 A high-stability organic coolant

[0052] A high-stability organic coolant comprises the following raw materials, calculated by weight: 45 parts of ultrapure water, 50 parts of ethylene glycol, 0.5 parts of tolutriazole, 1 part of isooctanoic acid, 1 part of tetradecanedioic acid, 0.5 parts of disodium ethylenediaminetetraacetate, 0.15 parts of phenothiazine, 1.5 parts of triethanolamine, 0.2 parts of polyether-modified siloxane, and 6.8 parts of a polyester mixture.

[0053] The raw material composition of the polyol mixture is as follows: 1.8 parts of dioctyl adipate, 2.5 parts of glycerol, and 2.5 parts of tributyl citrate, calculated in parts by weight.

[0054] The polyether-modified silicone is Shanghai Huiyan HY-7608.

[0055] A method for preparing a high-stability organic coolant comprises the following steps:

[0056] Step 1: Preparation of Polyester Mixture

[0057] Mix tributyl citrate and glycerol evenly, heat to 45°C, and stir at 200 rpm until clear to obtain a mixed solution. Then, divide dioctyl adipate into three equal parts and add them to the mixed solution three times at a speed of 200 rpm, with an interval of 8 minutes between each addition. After addition, stir until transparent to obtain a polyester mixture.

[0058] Step 2: Add the polyester mixture

[0059] At room temperature, ethylene glycol was added to the reactor, the reactor speed was set to 250 rpm, ultrapure water was added, the flow rate was controlled to 10 g / min, and mixed evenly; the polyester mixture was added to the reactor and stirred for 15 minutes.

[0060] Step 3: Add corrosion inhibitor

[0061] The reactor was heated to 40°C, and methylbenzotriazole, isooctanoic acid, and tetradecanedioic acid were added to the reactor for primary stirring. The reactor was then heated to 65°C for secondary stirring. The primary stirring speed was 250 rpm for 40 minutes, and the secondary stirring speed was 350 rpm for 60 minutes.

[0062] Step 4: Add additives

[0063] Add disodium EDTA and phenothiazine to the reactor and stir until completely dispersed. Add triethanolamine to the reactor and adjust the pH of the solution to 9.0. Cool the reactor to 40°C, add polyether-modified siloxane, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0064] Comparative Example 1 An organic coolant

[0065] An organic coolant comprises the following raw materials, calculated by weight: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 parts of tolutriazole, 0.9 parts of isooctanoic acid, 0.8 parts of tetradecanedioic acid, 0.4 parts of disodium ethylenediaminetetraacetic acid, 0.1 parts of phenothiazine, 1.2 parts of triethanolamine, 0.1 parts of polyether-modified silicone, and 4.8 parts of a polyester mixture.

[0066] The raw material composition of the polyol mixture is as follows: 2.3 parts of glycerol and 2.5 parts of tributyl citrate.

[0067] The polyether-modified silicone is Shanghai Huiyan HY-7608.

[0068] A method for preparing an organic coolant comprises the following steps:

[0069] Step 1: Preparation of Polyester Mixture

[0070] Tributyl citrate and glycerol were mixed evenly, heated to 40° C., and stirred at 250 rpm until clear to obtain a polyester mixture.

[0071] Step 2: Add the polyester mixture

[0072] At room temperature, ethylene glycol was added to the reactor, the reactor speed was set to 200 rpm, ultrapure water was added, the flow rate was controlled to 8 g / min, and mixed evenly; the polyester mixture was added to the reactor and stirred for 15 minutes.

[0073] Step 3: Add corrosion inhibitor

[0074] The reactor was heated to 50°C, and tolyltriazole, isooctanoic acid, and tetradecanedioic acid were added to the reactor for primary stirring. The reactor was then heated to 65°C for secondary stirring. The primary stirring speed was 200 rpm for 35 minutes, and the secondary stirring speed was 300 rpm for 80 minutes.

[0075] Step 4: Add additives

[0076] Add disodium EDTA and phenothiazine to the reactor and stir until completely dispersed. Add triethanolamine to the reactor and adjust the pH of the solution to 8.9. Cool the reactor to 35°C, add polyether-modified siloxane, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0077] Comparative Example 2 An organic coolant

[0078] An organic coolant comprises the following raw materials, calculated by weight: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 parts of tolutriazole, 0.9 parts of isooctanoic acid, 0.8 parts of tetradecanedioic acid, 0.4 parts of disodium ethylenediaminetetraacetic acid, 0.1 parts of phenothiazine, 1.2 parts of triethanolamine, 0.1 parts of polyether-modified siloxane, and 4.1 parts of a polyester mixture.

[0079] The raw material composition of the polyol mixture is as follows: 1.6 parts of dioctyl adipate and 2.5 parts of tributyl citrate, calculated in parts by weight.

[0080] The polyether-modified silicone is Shanghai Huiyan HY-7608.

[0081] A method for preparing an organic coolant comprises the following steps:

[0082] Step 1: Preparation of Polyester Mixture

[0083] Heat tributyl citrate to 40°C, divide dioctyl adipate into three equal parts, and add them to the tributyl citrate three times at a speed of 250 rpm with an interval of 5 minutes between each addition. After addition, stir until transparent to obtain a polyol mixture.

[0084] Step 2: Add the polyester mixture

[0085] At room temperature, ethylene glycol was added to the reactor, the reactor speed was set to 200 rpm, ultrapure water was added, the flow rate was controlled to 8 g / min, and mixed evenly; the polyester mixture was added to the reactor and stirred for 15 minutes.

[0086] Step 3: Add corrosion inhibitor

[0087] The reactor was heated to 50°C, and tolyltriazole, isooctanoic acid, and tetradecanedioic acid were added to the reactor for primary stirring. The reactor was then heated to 65°C for secondary stirring. The primary stirring speed was 200 rpm for 35 minutes, and the secondary stirring speed was 300 rpm for 80 minutes.

[0088] Step 4: Add additives

[0089] Add disodium EDTA and phenothiazine to the reactor and stir until completely dispersed. Add triethanolamine to the reactor and adjust the pH of the solution to 8.9. Cool the reactor to 35°C, add polyether-modified siloxane, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0090] Comparative Example 3: An organic coolant

[0091] An organic coolant comprises the following raw materials, calculated by weight: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 parts of tolutriazole, 0.9 parts of isooctanoic acid, 0.8 parts of tetradecanedioic acid, 0.4 parts of disodium ethylenediaminetetraacetic acid, 0.1 parts of phenothiazine, 1.2 parts of triethanolamine, 0.1 parts of polyether-modified silicone, and 3.9 parts of a polyester mixture.

[0092] The raw material composition of the polyol mixture is as follows: 1.6 parts of dioctyl adipate and 2.3 parts of glycerol, calculated in parts by weight.

[0093] The polyether-modified silicone is Shanghai Huiyan HY-7608.

[0094] A method for preparing an organic coolant comprises the following steps:

[0095] Step 1: Preparation of Polyester Mixture

[0096] Mix the glycerol evenly and heat it to 40°C. Then, divide dioctyl adipate into three equal parts and add them to the glycerol three times at a speed of 250 rpm with an interval of 5 minutes between each addition. After adding, stir until transparent to obtain a polyester mixture.

[0097] Step 2: Add the polyester mixture

[0098] At room temperature, ethylene glycol was added to the reactor, the reactor speed was set to 200 rpm, ultrapure water was added, the flow rate was controlled to 8 g / min, and mixed evenly; the polyester mixture was added to the reactor and stirred for 15 minutes.

[0099] Step 3: Add corrosion inhibitor

[0100] The reactor was heated to 50°C, and tolyltriazole, isooctanoic acid, and tetradecanedioic acid were added to the reactor for primary stirring. The reactor was then heated to 65°C for secondary stirring. The primary stirring speed was 200 rpm for 35 minutes, and the secondary stirring speed was 300 rpm for 80 minutes.

[0101] Step 4: Add additives

[0102] Add disodium EDTA and phenothiazine to the reactor and stir until completely dispersed. Add triethanolamine to the reactor and adjust the pH of the solution to 8.9. Cool the reactor to 35°C, add polyether-modified siloxane, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0103] Comparative Example 4: An organic coolant

[0104] An organic coolant comprises the following raw materials, calculated in parts by weight: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 parts of tolutriazole, 0.9 parts of isooctanoic acid, 0.8 parts of tetradecanedioic acid, 0.4 parts of disodium ethylenediaminetetraacetate, 0.1 parts of phenothiazine, 1.2 parts of triethanolamine, and 0.1 parts of polyether-modified siloxane.

[0105] The polyether-modified silicone is Shanghai Huiyan HY-7608.

[0106] A method for preparing an organic coolant comprises the following steps:

[0107] Step 1: Add corrosion inhibitor

[0108] At room temperature, add ethylene glycol to a reactor, set the reactor speed to 200 rpm, add ultrapure water at a flow rate of 8 g / min, and mix thoroughly. Heat the reactor to 50°C, add tolyltriazole, isooctanoic acid, and tetradecanedioic acid, and perform primary stirring. Then, heat the reactor to 65°C and perform secondary stirring. The primary stirring speed is 200 rpm for 35 minutes, and the secondary stirring speed is 300 rpm for 80 minutes.

[0109] Step 2: Add additives

[0110] Add disodium EDTA and phenothiazine to the reactor and stir until completely dispersed. Add triethanolamine to the reactor and adjust the pH of the solution to 8.9. Cool the reactor to 35°C, add polyether-modified siloxane, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0111] Example 4 Performance Test

[0112] (I) The organic coolants prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to a coolant stability test according to the test method in GB 29743.1-2022 at a test temperature of 60°C for 672 hours. The test results are shown in Table 1.

[0113] Table 1

[0114] The test results in Table 1 show that the organic coolant prepared by the present invention has excellent stability. Under the temperature condition of 60° C., after 672 hours, the color of the coolant does not change significantly and no precipitation occurs.

[0115] (2) The organic coolants prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to glassware corrosion tests according to the test method in GB 29743.1-2022. The corrosion to cast aluminum, copper, cast iron, steel, solder, and brass was tested respectively. The test temperature was 90° C. and the test time was 336 h. The test results are shown in Table 2.

[0116] Table 2

[0117] As can be seen from the test results in Table 2, the organic coolant prepared by the present invention significantly reduces its corrosiveness by adding a polyester mixture. The corrosiveness to cast aluminum is -0.4 to -0.6 mg, the corrosiveness to copper is +0.1 to +0.2 mg, the corrosiveness to cast iron is -0.3 to -0.4 mg, the corrosiveness to steel is -0.1 to -0.2 mg, the corrosiveness to solder is +0.6 to +0.9 mg, and the corrosiveness to brass is +0.1 to +0.3 mg.

[0118] (III) The organic coolants prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to conductivity tests according to the test method in GB / T 11007-2008. The test results are shown in Table 3.

[0119] Table 3

[0120] The test results in Table 3 show that the organic coolant prepared by the present invention has a low conductivity of 0.21-0.24 μS / cm. Low conductivity means that the coolant has a low degree of ionization and higher stability.

[0121] Obviously, there are many specific implementation methods that can be changed under the concept of the present invention. Here, it should be stated that any changes made under the inventive concept of the present invention will fall within the scope of protection of the present invention.

Claims

1. A high-stability organic coolant, characterized by: The organic coolant comprises, in parts by weight, 40-45 parts of ultrapure water, 50-55 parts of ethylene glycol, 0.3-0.5 parts of toluenetriazole, 0.8-1 parts of isooctanoic acid, 0.5-1 parts of tetradecanedioic acid, 0.2-0.5 parts of disodium ethylenediaminetetraacetate, 0.08-0.15 parts of phenothiazine, 1.0-1.5 parts of triethanolamine, 0.1-0.2 parts of polyether-modified siloxane, and 5.5-6.8 parts of a polyester mixture. The polyester mixture is prepared by mixing dioctyl adipate, glycerol and tributyl citrate to obtain the polyester mixture.

2. The high-stability organic coolant according to claim 1, characterized in that: The polyol mixture is composed of the following raw materials in parts by weight: 1.5-1.8 parts of dioctyl adipate, 2.0-2.5 parts of glycerol, and 2.0-2.5 parts of tributyl citrate.

3. The method for preparing a high-stability organic coolant according to any one of claims 1-2, characterized in that: The method comprises the steps of preparing a polyester mixture, adding the polyester mixture, adding a corrosion inhibitor, and adding an additive; The method for preparing the polyester mixture comprises the following steps: uniformly mixing tributyl citrate and glycerol, heating to 40-45° C., and stirring at 200-250 rpm until the mixture becomes clear to obtain a mixed solution; and then adding dioctyl adipate to the mixed solution, stirring until the mixture becomes transparent to obtain the polyester mixture.

4. The method for preparing a high-stability organic coolant according to claim 3, characterized in that: The method for adding dioctyl adipate to the mixed solution is as follows: the dioctyl adipate is divided into three equal parts, and the parts are added to the mixed solution three times, with an interval of 5 to 8 minutes between each addition.

5. The method for preparing a high-stability organic coolant according to claim 3, characterized in that: The adding of the polyester mixture: adding ethylene glycol to the reactor at room temperature, setting the reactor speed to 200-250 rpm, adding ultrapure water and mixing evenly; adding the polyester mixture to the reactor and stirring for 10-15 minutes.

6. The method for preparing a high-stability organic coolant according to claim 5, characterized in that: In the step of adding the polyester mixture, the addition rate of ultrapure water is controlled to be 5-10 g / min.

7. The method for preparing a high-stability organic coolant according to claim 3, characterized in that: The adding of the corrosion inhibitor: heating the reactor to 40-50° C., adding tolyltriazole, isooctanoic acid and tetradecanedioic acid into the reactor, performing primary stirring, and then heating the reactor to 60-65° C., performing secondary stirring.

8. The method for preparing a high-stability organic coolant according to claim 7, characterized in that: In the step of adding the corrosion inhibitor, the first-level stirring speed is 200-250 rpm, and the stirring time is 30-40 min; the second-level stirring speed is 300-350 rpm, and the stirring time is 60-90 min.

9. The method for preparing a high-stability organic coolant according to claim 3, characterized in that: The adding of the auxiliary agent comprises the following steps: adding disodium ethylenediaminetetraacetic acid and phenothiazine into a reaction kettle and stirring until they are completely dispersed; adjusting the pH value of the solution in the reaction kettle; cooling the reaction kettle to 30-40° C., adding polyether-modified siloxane, and stirring at 200-250 rpm for 30-40 minutes to obtain a transparent solution, which is a highly stable organic coolant.

10. The method for preparing a high-stability organic coolant according to claim 9, characterized in that: In the step of adding the auxiliary agent, the pH value of the solution in the reactor is adjusted by adding triethanolamine into the reactor to adjust the pH value of the solution to 8.8-9.0.

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