High-stability organic cooling liquid and preparation method thereof

Abstract

The invention provides high-stability organic cooling liquid and a preparation method thereof, and relates to the technical field of cooling liquid. The organic cooling liquid is prepared from the following raw materials in parts by weight: 40 to 45 parts of ultrapure water, 50 to 55 parts of ethylene glycol, 0.3 to 0.5 part of methylbenzotriazole, 0.8 to 1 part of isocaprylic acid, 0.5 to 1 part of tetradecanedioic acid, 0.2 to 0.5 part of disodium ethylene diamine tetraacetate, 0.08 to 0.15 part of phenothiazine, 1.0 to 1.5 parts of triethanolamine, 0.1 to 0.2 part of polyether modified siloxane and 5.5 to 6.8 parts of a polyester mixture. The polyester mixture is prepared by mixing dioctyl adipate, glycerol and tributyl citrate, and the polyester mixture is obtained. The preparation method of the high-stability organic cooling liquid comprises the following steps: preparing the polyester mixture, adding the polyester mixture, adding the corrosion inhibitor, and adding the auxiliary agent. The high-stability organic cooling liquid disclosed by the invention has the advantages of excellent stability, relatively low corrosivity and relatively low conductivity.

Description

Technical Field

[0001] The present invention relates to the technical field of coolant, and specifically relates to a highly stable organic coolant and a preparation method thereof. Background Art

[0002] In the market of organic coolants, although there are numerous formulations, precipitation is a relatively common problem in the high-temperature test and detection process. Through in-depth analysis, this problem is likely caused by the precipitation of additives. After the additives precipitate, they are likely to block the radiator or water pump, which in turn causes the corrosion inhibitor to fail prematurely. When the corrosion inhibitor fails, it will further lead to serious consequences such as metal corrosion and scale formation.

[0003] The prior art with the 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 preparing an auxiliary agent by combining a vacuum freeze-drying process, the defoaming performance and conductivity stability of the coolant are significantly improved. However, the solubility problem of long-chain acids is not solved, and relying on a colloid stabilizer may cause an increase in low-temperature viscosity or a risk of precipitation at high temperatures, and the stability of the coolant cannot be effectively improved. The prior art with the publication number CN118326401A discloses a compound corrosion inhibitor and an environmentally friendly coolant. By compounding fatty acid-based and aromatic corrosion inhibitors, the hard water resistance, anti-scaling performance, and long-term corrosion inhibition ability are enhanced. However, long-chain carboxylic acid corrosion inhibitors still have the problem of low solubility at high temperatures, and may precipitate due to strong intermolecular forces, resulting in blockage of the heat dissipation system.

[0004] In summary, although the existing technical solutions have improved certain properties of the coolant to a certain extent, there are still the following technical problems: poor stability of the coolant, easy to produce precipitation; certain corrosion to metal containers; high conductivity. Summary of the Invention

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

[0006] To achieve the above objectives, the following technical solutions are adopted: A highly stable organic coolant, by weight, the raw material composition is: 40 - 45 parts of ultrapure water, 50 - 55 parts of ethylene glycol, 0.3 - 0.5 parts of methyl benzotriazole, 0.8 - 1 part of isooctanoic acid, 0.5 - 1 part 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 silicone, 5.5 - 6.8 parts of polyol ester mixture.

[0007] The polyol ester mixture, by weight, the raw material composition is: 1.5 - 1.8 parts of dioctyl adipate, 2.0 - 2.5 parts of glycerol, 2.0 - 2.5 parts of tributyl citrate.

[0008] The polyether-modified silicone selected is Shanghai Huiyan HY-7608.

[0009] The present invention also provides a preparation method of a highly stable organic coolant, and the steps are as follows: Step 1, prepare the polyol ester mixture Mix tributyl citrate and glycerol evenly, heat to 40 - 45 °C, stir at 200 - 250 rpm until clear to obtain a mixed solution. Then divide dioctyl adipate into three equal parts and add them to the mixed solution in three times, with an interval of 5 - 8 minutes each time. After adding, stir until transparent to obtain the polyol ester mixture.

[0010] Step 2, add the polyol ester mixture At room temperature, add ethylene glycol to the reaction kettle, set the rotation speed of the reaction kettle to 200 - 250 rpm, add ultrapure water, control the flow rate to 5 - 10 g / min, and mix evenly; add the polyol ester mixture to the reaction kettle and stir for 10 - 15 minutes.

[0011] Step 3, add corrosion inhibitors Heat the reaction kettle to 40 - 50 °C, add methyl benzotriazole, isooctanoic acid, and tetradecanedioic acid to the reaction kettle for primary stirring, and then heat the reaction kettle to 60 - 65 °C for secondary stirring. The primary stirring: the stirring speed is 200 - 250 rpm, and the stirring time is 30 - 40 minutes; the secondary stirring: the stirring speed is 300 - 350 rpm, and the stirring time is 60 - 90 minutes.

[0012] Step 4, add auxiliaries Add disodium ethylenediaminetetraacetate and phenothiazine to the reaction kettle and stir until completely dispersed. Add triethanolamine to the reaction kettle to adjust the pH value of the solution to 8.8 - 9.0. Cool the reaction kettle to 30 - 40 °C, add polyether-modified silicone, and stir at 200 - 250 rpm for 30 - 40 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0013] Mechanism of action of the present invention: Dioctyl adipate and methylbenzotriazole achieve intermolecular binding through the interaction dominated by van der Waals forces. Among them, the hydrophobic stacking of the octyl long chain and the benzene ring is the main driving force, and the dipole-dipole interaction between the ester group and the heterocycle plays an auxiliary stabilizing effect. The dipole-dipole interaction between the ester group and the heterocycle affects water solubility in the following two ways: First, the synergistic effect of polar groups reduces the interfacial energy between the complex and the water phase, promoting dispersion; Second, the oxygen atom of the ester group and the nitrogen atom of the nitrogen heterocycle can form hydrogen bonds with water molecules, enhancing solubility. The adjacent hydroxyl groups of glycerol and the carboxyl group of isooctanoic acid form a six-membered cyclic association structure through double hydrogen bonds (O-H…O); this structure disrupts the dimer hydrogen bond between the carboxyl groups of isooctanoic acid itself through hydrogen bond competition between the hydroxyl group and the carboxyl group; the formation of the cyclic structure increases the steric hindrance of isooctanoic acid molecules, thereby inhibiting the crystallization and precipitation of isooctanoic acid. The ester group of tributyl citrate and the carboxyl group of tetradecanedioic acid interfere with the orderly arrangement between carboxyl groups through dipole-dipole interaction; the butyl side chain of tributyl citrate prevents the regular stacking of the carbon chain of tetradecanedioic acid through steric hindrance effect, inhibiting crystallization. In addition, dioctyl adipate, tributyl citrate, and glycerol build a dissolution network covering the entire polarity range through the synergistic effect of intermolecular interactions. Greatly improve the stability of the organic coolant.

[0014] The beneficial effects of the present invention are as follows: (1) The organic coolant of the present invention has excellent stability. At a temperature of 60 °C, no precipitation can occur for 672 h, and the color of the coolant does not change significantly.

[0015] (2) The present invention greatly reduces the corrosion of the coolant to metal containers, prolongs the service life of metal containers. The corrosion to cast aluminum is -0.4~-0.6 mg, the corrosion to red copper is +0.1~+0.2 mg, the corrosion to cast iron is -0.3~-0.4 mg, the corrosion to steel is -0.1~-0.2 mg, the corrosion to solder is +0.6~+0.9 mg, and the corrosion to brass is +0.1~+0.3 mg.

[0016] (3) The organic coolant prepared by the present invention has a low conductivity, and the conductivity is 0.21~0.24 μS / cm. A low conductivity means a low degree of ionization of the coolant and higher stability. Detailed implementation manners

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] Example 1 A highly stable organic coolant A highly stable organic coolant, by weight, the raw material composition is: 40 parts of ultrapure water, 55 parts of ethylene glycol, 0.3 parts of methyl benzotriazole, 0.8 parts of isooctanoic acid, 0.5 parts of tetradecanedioic acid, 0.2 parts of disodium ethylenediaminetetraacetate, 0.08 parts of phenothiazine, 1.0 part of triethanolamine, 0.1 part of polyether-modified silicone oil, 5.5 parts of polyol ester mixture.

[0019] The polyol ester mixture, by weight, the raw material composition is: 1.5 parts of dioctyl adipate, 2.0 parts of glycerol, 2.0 parts of tributyl citrate.

[0020] The polyether-modified silicone oil is selected as Shanghai Huiyan HY-7608.

[0021] A preparation method of a highly stable organic coolant, the steps are as follows: Step 1. Prepare the polyol ester mixture Mix tributyl citrate and glycerol evenly, heat to 40 °C, 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 in three times, set the rotation speed to 250 rpm, with an interval of 5 min each time. After adding, stir until transparent to obtain the polyol ester mixture.

[0022] Step 2. Add the polyol ester mixture At room temperature, add ethylene glycol to the reaction kettle, set the rotation speed of the reaction kettle to 200 rpm, add ultrapure water, control the flow rate to 5 g / min, and mix evenly; add the polyol ester mixture to the reaction kettle and stir for 10 min.

[0023] Step 3. Add corrosion inhibitors Heat the reaction kettle to 40 °C, add methyl benzotriazole, isooctanoic acid, and tetradecanedioic acid to the reaction kettle, carry out primary stirring, and then heat the reaction kettle to 60 °C for secondary stirring. The primary stirring: the stirring speed is 200 rpm and the stirring time is 30 min; the secondary stirring: the stirring speed is 300 rpm and the stirring time is 90 min.

[0024] Step 4. Add additives Add disodium ethylenediaminetetraacetate and phenothiazine to the reaction kettle and stir until completely dispersed. Add triethanolamine to the reaction kettle and adjust the pH value of the solution to 8.8. Cool the reaction kettle to 30 °C, add polyether-modified silicone oil, and stir at 200 rpm for 40 min to obtain a transparent solution, which is a highly stable organic coolant.

[0025] Example 2 A highly stable organic coolant A highly stable organic coolant, by weight, the raw material composition is: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 parts of methyl benzotriazole, 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, 0.1 parts of polyether modified silicone, 6.4 parts of polyol ester mixture.

[0026] The polyol ester mixture, by weight, the raw material composition is: 1.6 parts of dioctyl adipate, 2.3 parts of glycerol, 2.5 parts of tributyl citrate.

[0027] The polyether modified silicone is selected as Shanghai Huiyan HY-7608.

[0028] A preparation method of a highly stable organic coolant, the steps are as follows: Step 1, prepare the polyol ester mixture Mix tributyl citrate and glycerol evenly, heat to 40 °C, 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 in three times, set the rotation speed at 250 rpm, with an interval of 5 minutes each time, and stir until transparent after adding to obtain the polyol ester mixture.

[0029] Step 2, add the polyol ester mixture At room temperature, add ethylene glycol to the reaction kettle, set the rotation speed of the reaction kettle at 200 rpm, add ultrapure water, control the flow rate at 8 g / min, and mix evenly; add the polyol ester mixture to the reaction kettle and stir for 15 minutes.

[0030] Step 3, add corrosion inhibitors Heat the reaction kettle to 50 °C, add methyl benzotriazole, isooctanoic acid, and tetradecanedioic acid to the reaction kettle, perform primary stirring, and then heat the reaction kettle to 65 °C for secondary stirring. The primary stirring: the stirring speed is 200 rpm and the stirring time is 35 minutes; the secondary stirring: the stirring speed is 300 rpm and the stirring time is 80 minutes.

[0031] Step 4, add additives Add disodium ethylenediaminetetraacetate and phenothiazine to the reaction kettle and stir until completely dispersed. Add triethanolamine to the reaction kettle and adjust the pH value of the solution to 8.9. Cool the reaction kettle to 35 °C, add polyether modified silicone, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0032] Example 3 A highly stable organic coolant A highly stable organic coolant, by weight, the raw material composition is: 45 parts of ultrapure water, 50 parts of ethylene glycol, 0.5 part of methyl benzotriazole, 1 part of isooctanoic acid, 1 part of tetradecanedioic acid, 0.5 part of disodium ethylenediaminetetraacetate, 0.15 part of phenothiazine, 1.5 parts of triethanolamine, 0.2 part of polyether-modified silicone oil, 6.8 parts of polyol ester mixture.

[0033] The polyol ester mixture, by weight, the raw material composition is: 1.8 parts of dioctyl adipate, 2.5 parts of glycerol, 2.5 parts of tributyl citrate.

[0034] The polyether-modified silicone oil selected is Shanghai Huiyan HY-7608.

[0035] A preparation method of a highly stable organic coolant, the steps are as follows: Step 1, prepare the polyol ester mixture Mix tributyl citrate and glycerol evenly, heat to 45 °C, 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 in three times, set the rotation speed at 200 rpm, with an interval of 8 minutes each time. After adding, stir until transparent to obtain the polyol ester mixture.

[0036] Step 2, add the polyol ester mixture At room temperature, add ethylene glycol to the reaction kettle, set the rotation speed of the reaction kettle at 250 rpm, add ultrapure water, control the flow rate at 10 g / min, and mix evenly; add the polyol ester mixture to the reaction kettle and stir for 15 minutes.

[0037] Step 3, add corrosion inhibitors Heat the reaction kettle to 40 °C, add methyl benzotriazole, isooctanoic acid, and tetradecanedioic acid to the reaction kettle, perform primary stirring, then heat the reaction kettle to 65 °C for secondary stirring. The primary stirring: the stirring speed is 250 rpm, and the stirring time is 40 minutes; the secondary stirring: the stirring speed is 350 rpm, and the stirring time is 60 minutes.

[0038] Step 4, add additives Add disodium ethylenediaminetetraacetate and phenothiazine to the reaction kettle and stir until completely dispersed. Add triethanolamine to the reaction kettle and adjust the pH value of the solution to 9.0. Cool the reaction kettle to 40 °C, add polyether-modified silicone oil, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0039] Comparative Example 1 An organic coolant An organic coolant, by weight, the raw material composition is: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 part of methylbenzotriazole, 0.9 part of isooctanoic acid, 0.8 part of tetradecanedioic acid, 0.4 part of disodium ethylenediaminetetraacetate, 0.1 part of phenothiazine, 1.2 parts of triethanolamine, 0.1 part of polyether-modified silicone, and 4.8 parts of polyol ester mixture.

[0040] The polyol ester mixture, by weight, the raw material composition is: 2.3 parts of glycerol and 2.5 parts of tributyl citrate.

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

[0042] A preparation method of an organic coolant, the steps are as follows: Step 1, prepare the polyol ester mixture Mix tributyl citrate and glycerol evenly, heat to 40 °C, stir at 250 rpm until clear to obtain the polyol ester mixture.

[0043] Step 2, add the polyol ester mixture At room temperature, add ethylene glycol to the reaction kettle, set the rotation speed of the reaction kettle to 200 rpm, add ultrapure water, control the flow rate to 8 g / min, and mix evenly; add the polyol ester mixture to the reaction kettle and stir for 15 min.

[0044] Step 3, add corrosion inhibitors Heat the reaction kettle to 50 °C, add methylbenzotriazole, isooctanoic acid, and tetradecanedioic acid to the reaction kettle, perform primary stirring, and then heat the reaction kettle to 65 °C for secondary stirring. The primary stirring: the stirring speed is 200 rpm and the stirring time is 35 min; the secondary stirring: the stirring speed is 300 rpm and the stirring time is 80 min.

[0045] Step 4, add additives Add disodium ethylenediaminetetraacetate and phenothiazine to the reaction kettle and stir until completely dispersed. Add triethanolamine to the reaction kettle and adjust the pH value of the solution to 8.9. Cool the reaction kettle to 35 °C, add polyether-modified silicone, and stir at 250 rpm for 30 min to obtain a transparent solution, which is a highly stable organic coolant.

[0046] Comparative Example 2 An organic coolant An organic coolant, by weight, the raw material composition is: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 part of methylbenzotriazole, 0.9 part of isooctanoic acid, 0.8 part of tetradecanedioic acid, 0.4 part of disodium ethylenediaminetetraacetate, 0.1 part of phenothiazine, 1.2 parts of triethanolamine, 0.1 part of polyether-modified silicone, and 4.1 parts of polyol ester mixture.

[0047] The polyol ester mixture has a raw material composition in parts by weight as follows: 1.6 parts of dioctyl adipate and 2.5 parts of tributyl citrate.

[0048] The polyether-modified silicone used is Shanghai Huiyan HY-7608.

[0049] A preparation method of an organic coolant is as follows: Step 1: Prepare the polyol ester mixture Heat tributyl citrate to 40°C, divide dioctyl adipate into three equal parts, add it to tributyl citrate in three times, set the rotation speed to 250 rpm, with an interval of 5 minutes each time. After adding, stir until transparent to obtain the polyol ester mixture.

[0050] Step 2: Add the polyol ester mixture At room temperature, add ethylene glycol to the reaction kettle, set the rotation speed of the reaction kettle to 200 rpm, add ultrapure water, control the flow rate to 8 g / min, and mix evenly; add the polyol ester mixture to the reaction kettle and stir for 15 minutes.

[0051] Step 3: Add the corrosion inhibitor Heat the reaction kettle to 50°C, add methylbenzotriazole, isooctanoic acid, and tetradecanedioic acid to the reaction kettle, perform primary stirring, and then heat the reaction kettle to 65°C for secondary stirring. The primary stirring: the stirring speed is 200 rpm and the stirring time is 35 minutes; the secondary stirring: the stirring speed is 300 rpm and the stirring time is 80 minutes.

[0052] Step 4: Add the auxiliary agent Add disodium ethylenediaminetetraacetate and phenothiazine to the reaction kettle and stir until completely dispersed. Add triethanolamine to the reaction kettle to adjust the pH value of the solution to 8.9. Cool the reaction kettle to 35°C, add the polyether-modified silicone, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0053] Comparative Example 3 An organic coolant An organic coolant has a raw material composition in parts by weight as follows: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 part of methylbenzotriazole, 0.9 part of isooctanoic acid, 0.8 part of tetradecanedioic acid, 0.4 part of disodium ethylenediaminetetraacetate, 0.1 part of phenothiazine, 1.2 parts of triethanolamine, 0.1 part of polyether-modified silicone, and 3.9 parts of polyol ester mixture.

[0054] The polyol ester mixture has a raw material composition in parts by weight as follows: 1.6 parts of dioctyl adipate and 2.3 parts of glycerol.

[0055] The polyether-modified silicone used is Shanghai Huiyan HY-7608.

[0056] A preparation method of an organic coolant is as follows: Step 1: Prepare a polyol ester mixture Mix glycerol evenly and heat it to 40°C. Then divide dioctyl adipate into three equal parts and add it to glycerol in three times, set the rotation speed at 250 rpm, with an interval of 5 minutes each time. After adding, stir until transparent to obtain a polyol ester mixture.

[0057] Step 2: Add the polyol ester mixture At room temperature, add ethylene glycol to the reaction kettle, set the rotation speed of the reaction kettle at 200 rpm, add ultrapure water, control the flow rate at 8 g / min, and mix evenly; add the polyol ester mixture to the reaction kettle and stir for 15 minutes.

[0058] Step 3: Add corrosion inhibitors Heat the reaction kettle to 50°C, add methylbenzotriazole, isooctanoic acid, and tetradecanedioic acid to the reaction kettle, and perform primary stirring. Then heat the reaction kettle to 65°C and perform secondary stirring. The primary stirring: the stirring speed is 200 rpm and the stirring time is 35 minutes; the secondary stirring: the stirring speed is 300 rpm and the stirring time is 80 minutes.

[0059] Step 4: Add additives Add disodium ethylenediaminetetraacetate and phenothiazine to the reaction kettle and stir until completely dispersed. Add triethanolamine to the reaction kettle and adjust the pH value of the solution to 8.9. Cool the reaction kettle to 35°C, add polyether-modified silicone, and stir at 250 rpm for 30 minutes to obtain a transparent solution, which is a highly stable organic coolant.

[0060] Comparative Example 4 An organic coolant An organic coolant, by weight, the raw material composition is: 45 parts of ultrapure water, 55 parts of ethylene glycol, 0.4 part of methylbenzotriazole, 0.9 part of isooctanoic acid, 0.8 part of tetradecanedioic acid, 0.4 part of disodium ethylenediaminetetraacetate, 0.1 part of phenothiazine, 1.2 parts of triethanolamine, and 0.1 part of polyether-modified silicone.

[0061] The polyether-modified silicone used is Shanghai Huiyan HY-7608.

[0062] A preparation method of an organic coolant is as follows: Step 1: Add corrosion inhibitors At room temperature, add ethylene glycol to the reaction kettle, set the rotation speed of the reaction kettle to 200 rpm, add ultrapure water, control the flow rate to 8 g / min, and mix evenly; heat the reaction kettle to 50 °C, add methylbenzotriazole, isooctanoic acid, and tetradecanedioic acid to the reaction kettle, perform primary stirring, and then heat the reaction kettle to 65 °C for secondary stirring. The primary stirring: the stirring speed is 200 rpm, and the stirring time is 35 min; the secondary stirring: the stirring speed is 300 rpm, and the stirring time is 80 min.

[0063] Step 2. Add additives Add disodium ethylenediaminetetraacetate and phenothiazine to the reaction kettle and stir until completely dispersed. Add triethanolamine to the reaction kettle to adjust the pH value of the solution to 8.9. Cool the reaction kettle to 35 °C, add polyether-modified silicone oil, and stir at 250 rpm for 30 min to obtain a transparent solution, which is a highly stable organic coolant.

[0064] Example 4 Performance test (1) Perform a coolant stability test on the organic coolants prepared in Examples 1 to 3 and Comparative Examples 1 to 4 according to the test method in GB 29743.1-2022. The test temperature is 60 °C and the test time is 672 h. The test results are shown in Table 1.

[0065] Table 1

[0066] It can be seen from the test results in Table 1 that the organic coolant prepared by the present invention has excellent stability. At a temperature of 60 °C, after 672 h, the color of the coolant does not change significantly and no precipitation occurs.

[0067] (2) Perform a glassware corrosion test on the organic coolants prepared in Examples 1 to 3 and Comparative Examples 1 to 4 according to the test method in GB 29743.1-2022, and test the corrosion resistance to cast aluminum, red copper, cast iron, steel, solder, and brass respectively. The test temperature is 90 °C and the test time is 336 h. The test results are shown in Table 2.

[0068] Table 2

[0069] As can be seen from the test results in Table 2, the organic coolant prepared by the present invention significantly reduces corrosion by adding a mixture of polyesters. The corrosion rate for cast aluminum is -0.4 to -0.6 mg, for red copper is +0.1 to +0.2 mg, for cast iron is -0.3 to -0.4 mg, for steel is -0.1 to -0.2 mg, for solder is +0.6 to +0.9 mg, and for brass is +0.1 to +0.3 mg.

[0070] (3) Conductivity tests were performed on the organic coolants prepared in Examples 1 to 3 and Comparative Examples 1 to 4 according to the test method in GB / T 11007-2008. The test results are shown in Table 3.

[0071] Table 3

[0072] As can be seen from the test results in Table 3, the organic coolant prepared by the present invention has a low conductivity, with a conductivity of 0.21 to 0.24 μS / cm. A low conductivity means a low degree of ionization of the coolant and higher stability.

[0073] 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 protection scope of the present invention.

Claims

1. A highly stable organic coolant, characterized in that: The organic coolant has the following raw material composition by weight: 40 - 45 parts of ultrapure water, 50 - 55 parts of ethylene glycol, 0.3 - 0.5 parts of methylbenzotriazole, 0.8 - 1 part of isooctanoic acid, 0.5 - 1 part 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 silicone, and 5.5 - 6.8 parts of polyol ester mixture; The polyol ester mixture: Dioctyl adipate, glycerol, and tributyl citrate are mixed to obtain the polyol ester mixture.

2. The high-stability organic coolant according to claim 1, characterized in that: The polyol ester mixture has the following raw material composition 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 preparation method of a highly stable organic coolant according to any one of claims 1-2, characterized in that: It includes steps of preparing the polyol ester mixture, adding the polyol ester mixture, adding corrosion inhibitors, and adding additives; The preparation of the polyol ester mixture: Tributyl citrate and glycerol are mixed evenly, heated to 40 - 45 °C, stirred at 200 - 250 rpm until clear to obtain a mixed solution; then dioctyl adipate is added to the mixed solution and stirred until transparent to obtain the polyol ester mixture.

4. The preparation method of a highly stable organic coolant according to claim 3, characterized in that: The method of adding dioctyl adipate to the mixed solution: Dioctyl adipate is divided into three equal parts and added to the mixed solution in three times, with an interval of 5 - 8 minutes each time.

5. The preparation method of a highly stable organic coolant according to claim 3, characterized in that: Adding the polyol ester mixture: At room temperature, ethylene glycol is added to the reaction kettle, the rotation speed of the reaction kettle is set to 200 - 250 rpm, and ultrapure water is added and mixed evenly; the polyol ester mixture is added to the reaction kettle and stirred for 10 - 15 minutes.

6. The preparation method of a highly stable organic coolant according to claim 5, characterized in that: In the step of adding the polyol ester mixture, the addition rate of ultrapure water is controlled at 5 - 10 g / min.

7. The preparation method of a highly stable organic coolant according to claim 3, characterized in that: Adding corrosion inhibitors: The reaction kettle is heated to 40 - 50 °C, methylbenzotriazole, isooctanoic acid, and tetradecanedioic acid are added to the reaction kettle for primary stirring, and then the reaction kettle is heated to 60 - 65 °C for secondary stirring.

8. The preparation method of a highly stable organic coolant according to claim 7, characterized in that: In the step of adding corrosion inhibitors, the rotation speed of primary stirring is 200 - 250 rpm and the stirring time is 30 - 40 minutes; the rotation speed of secondary stirring is 300 - 350 rpm and the stirring time is 60 - 90 minutes.

9. The preparation method of a highly stable organic coolant according to claim 3, characterized in that: Adding additives: Disodium ethylenediaminetetraacetate and phenothiazine are added to the reaction kettle and stirred until completely dispersed; the pH value of the solution in the reaction kettle is adjusted; the reaction kettle is cooled to 30 - 40 °C, polyether modified silicone is added, and stirred at 200 - 250 rpm for 30 - 40 minutes to obtain a transparent solution, which is a highly stable organic coolant.

10. The preparation method of a highly stable organic coolant according to claim 9, characterized in that: Adjusting the pH value of the solution in the reaction kettle in the step of adding additives: Triethanolamine is added to the reaction kettle to adjust the pH value of the solution to 8.8 - 9.0.

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