Long-life ultra-clean liquid cooling working medium and preparation method and application thereof

Abstract

The invention belongs to the technical field of fluid heat exchange, and particularly relates to a long-life ultra-clean liquid cooling working medium and a preparation method and application thereof. The liquid cooling working medium comprises the following components: deionized water, an anti-freezing agent, a corrosion inhibitor, an oxidation inhibitor, a pH regulator and a defoaming agent, wherein the anti-freezing agent is a mixture of saturated monohydric alcohol and saturated dihydric alcohol. The liquid cooling working medium has the advantages of excellent anti-freezing and anti-boiling capabilities and wide applicable temperature range; the metal corrosion resistance is excellent; the non-metallic material compatibility is excellent, and the phenomena of swelling and precipitation do not occur; the invention discloses an ultra-clean solution. The liquid cooling working medium integrates the advantages, creatively solves the problem of gas production caused by long-term contact between the liquid cooling working medium and a cold plate of a thermal control system, and ensures that a fluid circulation thermal control system of a spaceflight satellite operates under constant pressure for a long time.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid heat exchange, and particularly relates to a long-life and ultra-clean liquid cooling working medium, its preparation method and application. Background Art

[0002] With the development of modern industrial technology, the aerospace satellite field has also been continuously breaking through technical bottlenecks. In recent years, the power of the light source subsystem has been increasing, and a large amount of heat released by the equipment needs to be dissipated in time to ensure the normal operation of the thermal control system and even the entire satellite equipment.

[0003] Dissipating the huge heat generated by the equipment mainly relies on liquid cooling technology, and a suitable liquid cooling working medium is filled in the fluid circuit system. The liquid cooling working medium used in the aerospace satellite fluid circulation thermal control system has extremely high requirements. It needs to have anti-freezing and anti-boiling functions; be compatible with the entire material system in the system, and at the same time protect 1035 aluminum alloy, 6061 aluminum alloy, 6063 aluminum alloy, 4004 solder, 4043 solder, TA1 titanium alloy, TA2 titanium alloy from corrosion; not swell or precipitate with sealing materials such as ethylene propylene diene monomer rubber, fluororubber, and polytetrafluoroethylene; limited by the inner cavity size of the filter device, to prevent blocking the filter, the liquid cooling working medium solution needs to be ultra-clean and free of foreign matters with a size of 25 μm or more; have excellent gas generation inhibition ability.

[0004] Currently, common liquid cooling working media in the heat exchange field include water, ethylene glycol aqueous solution, propylene glycol aqueous solution, simple monohydric alcohol aqueous solution, inorganic salt aqueous solution, etc., but they all have inevitable drawbacks. There is no report on a liquid cooling working medium that simultaneously meets the compatibility of the entire material system and the ultra-clean conditions. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a long-life and ultra-clean liquid cooling working medium, which is particularly suitable for the aerospace satellite fluid circulation thermal control system, has excellent anti-freezing and anti-boiling capabilities; is in grade I compatibility with the entire material system in the thermal control system and has excellent and long-lasting anti-corrosion capabilities; the solution is ultra-clean, does not contain foreign matters with a size of 25 μm or more, and does not block the filter; and creatively solves the problems of gas generation and pressure increase in the closed system during operation.

[0006] In order to achieve the object of the present invention, the following technical solutions are specifically adopted:

[0007] A long-life and ultra-clean liquid cooling working medium, comprising the following components: deionized water, antifreeze, corrosion inhibitor, oxidation inhibitor, pH regulator, defoamer;

[0008] Wherein, the antifreeze is a mixture of saturated monohydric alcohol and saturated dihydric alcohol.

[0009] Preferably, the saturated monohydric alcohol is one or more of methanol, ethanol, and propanol; the saturated dihydric alcohol is one or more of ethylene glycol, 1,2-propanediol, and 1,3-propanediol.

[0010] Most preferably, the antifreeze is a mixture of ethylene glycol and ethanol with a mass ratio of 9:1 to 6. It has been found that using a compound of ethylene glycol and ethanol in the above mass ratio as an antifreeze can significantly reduce the freezing point of the liquid cooling working medium.

[0011] Preferably, the corrosion inhibitor is more than two of 1-(trimethylsilyl)-1H-benzotriazole, 2-ethyl-2,5,5-trimethylhexanoic acid, monon-dodecyl phosphate, 2-ethyl-caprylic acid, 2,5-dimethyl-3-hydroxybenzoic acid, and ethylenediaminetetramethylenephosphonic acid.

[0012] Most preferably, the corrosion inhibitor is selected from one of the following combinations:

[0013] A) A combination of 1-(trimethylsilyl)-1H-benzotriazole, 2-ethyl-2,5,5-trimethylhexanoic acid, and 2,5-dimethyl-3-hydroxybenzoic acid;

[0014] B) A combination of 2-ethyl-caprylic acid, ethylenediaminetetramethylenephosphonic acid, and monon-dodecyl phosphate;

[0015] C) A combination of 1-(trimethylsilyl)-1H-benzotriazole, 2-ethyl-2,5,5-trimethylhexanoic acid, 2,5-dimethyl-3-hydroxybenzoic acid, 2-ethyl-caprylic acid, ethylenediaminetetramethylenephosphonic acid, and monon-dodecyl phosphate.

[0016] Preferably, the oxidation inhibitor is a mixture of an organic compound type oxidation inhibitor and an inorganic compound type oxidation inhibitor with a mass ratio of 1:0.3 to 0.8;

[0017] The organic compound type oxidation inhibitor is one or more of cocoyl glutamate TEA salt, a compound of C10-16-alkylbenzenesulfonic acid and triethanolamine, a TEA salt of C10-13-benzenesulfonic acid-alkyl derivative, sodium gluconate, 3-carboxy-4-[2-(trimethylaminopentyl)ethyl]phenol ester, and 2-methyl-3-phenylacrolein; the inorganic compound type oxidation inhibitor is one or more of sodium sulfite, sodium bisulfite, and sodium hexametaphosphate.

[0018] Through the combined use of the above-mentioned several specific corrosion inhibitors and oxidation inhibitors, namely the synergistic effect, the anti-corrosion ability of the liquid cooling working medium is significantly enhanced, and it can simultaneously protect 1035 aluminum alloy, 6061 aluminum alloy, 6063 aluminum alloy, 4004 solder, 4043 solder, TA1 titanium alloy, and TA2 titanium alloy from corrosion; it does not cause swelling or precipitation with sealing materials such as ethylene propylene diene monomer rubber, fluororubber, and polytetrafluoroethylene.

[0019] Preferably, the pH regulator is one or more of borax, potassium hydrogen phthalate, sodium bicarbonate, disodium hydrogen phosphate, and sodium dihydrogen phosphate. The pH regulator adjusts the pH of the solution to 8.0 - 10.0 through an acid-base neutralization reaction to better protect all the metallic and non-metallic materials in the thermal control system. The dosage of the pH regulator is approximately 0.1 - 0.8%.

[0020] Preferably, the defoamer is one or more of polyether defoamers, silicone defoamers, and higher alcohol defoamers, and it has good foam suppression and defoaming capabilities in the system of the present invention.

[0021] Preferably, the liquid cooling working medium, by mass percentage, comprises the following components:

[0022]

[0023] The appropriate amount is based on adjusting the pH value of the heat transfer working medium to 8.0 - 10.0.

[0024] More preferably, the liquid cooling working medium, by mass percentage, comprises the following components:

[0025]

[0026]

[0027] The appropriate amount is based on adjusting the pH value of the heat transfer working medium to 8.0 - 10.0.

[0028] On the basis of conforming to the common knowledge in the art, the above-mentioned preferred conditions can be combined with each other to obtain various preferred embodiments of the present invention.

[0029] The present invention also provides a preparation method for the above-mentioned long-life and ultra-clean liquid cooling working medium, comprising the following steps:

[0030] Mix each component according to the ratio and stir evenly to obtain a mother liquor, and then filter the mother liquor through a 25-μm microporous filter membrane to obtain the product.

[0031] The present invention also provides the application of the above-mentioned long-life and ultra-clean liquid cooling working medium or the long-life and ultra-clean liquid cooling working medium prepared by the above-mentioned preparation method in the fluid circulation thermal control system of aerospace satellites.

[0032] Compared with the prior art, the long-acting cooling medium of the present invention has the following advantages and effects:

[0033] (1) Wide temperature range of use: By compounding ethylene glycol and ethanol in a specific ratio, the lowest freezing point can reach -65°C, and the highest boiling point can reach 110°C. This temperature range can fully meet the temperature range requirements of the fluid circulation thermal control system of aerospace satellites;

[0034] (2) Low viscosity at low temperatures: The introduction of ethanol as an antifreeze enables the liquid cooling working medium to still flow normally under the low temperature condition of -65°C, and the flow resistance is much smaller than that of a pure binary alcohol-based heat exchange working medium with the same freezing point;

[0035] (3) Good compatibility: Through the synergistic effect of a variety of preferably selected corrosion inhibitor components and oxidation inhibitor components, the corrosion problem of the thermal control system is effectively solved. The compatibility with metal materials such as 1035 aluminum alloy, 6061 aluminum alloy, 6063 aluminum alloy, 4004 solder, 4043 solder, TA1 titanium alloy, and TA2 titanium alloy all reaches Class I compatibility, that is, the corrosion rate is less than 0.001 mm / a; the compatibility with non-metallic materials such as ethylene propylene diene monomer rubber, fluororubber, and polytetrafluoroethylene meets the requirements of a mass change of less than 1% and a volume change of less than 1%.

[0036] (4) Ultra-clean: The amount of foreign matter with a size of 25 μm and above in the liquid cooling working medium solution is 0, and it does not clog the filter.

[0037] (5) No gas generation phenomenon: The liquid cooling working medium has excellent compatibility with the entire material system. When filled in the closed cold plate of the aerospace satellite thermal control system, no gas generation phenomenon occurs within one year, that is, the change value of the cold plate pressure gauge reading is 0. Otherwise, it will cause the risk of cavitation and the risk of damaging components. Detailed implementation manners

[0038] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with specific implementation manners. The following examples are used to illustrate the present invention, but are not used to limit the scope of the present invention. For those not specified in the examples regarding specific technologies or conditions, they shall be carried out according to the technologies or conditions described in the literature in this field or according to the product specifications.

[0039] Note: The percentages mentioned later are all mass percentages.

[0040] Example 1

[0041] A long-life and ultra-clean liquid cooling working medium for the fluid circulation thermal control system of an aerospace satellite is composed of the following components:

[0042] Antifreeze:

[0043] 30% ethylene glycol

[0044] 20% ethanol

[0045] Corrosion inhibitor:

[0046] 0.5% 1-(trimethylsilyl)-1H-benzotriazole

[0047] 0.5% 2-ethyl-2,5,5-trimethylhexanoic acid

[0048] 0.5% 2,5-dimethyl-3-hydroxybenzoic acid

[0049] Oxidation inhibitor:

[0050] 0.3% TEA cocoyl glutamate

[0051] 0.3% 2-methyl-3-phenylacrolein

[0052] 0.2% sodium hexametaphosphate

[0053] pH regulator:

[0054] 0.3% potassium hydrogen phthalate.

[0055] Defoamer:

[0056] 0.005% silicone defoamer (from Foshan Nanhai Datian Chemical Co., Ltd., the same below).

[0057] 47.395% deionized water

[0058] The characteristic parameters of the liquid cooling working medium in this example are: freezing point -65°C, pH value 8.5, and 816 impurities above 25 μm.

[0059] Example 2

[0060] A long-life and ultra-clean liquid cooling working medium for the fluid circulation thermal control system of an aerospace satellite, which is composed of the following components:

[0061] Antifreeze:

[0062] 45% ethylene glycol

[0063] 5% ethanol

[0064] Corrosion inhibitor:

[0065] 0.5% 1-(trimethylsilyl)-1H-benzotriazole

[0066] 0.5% 2-ethyl-2,5,5-trimethylhexanoic acid

[0067] 0.5% 2,5-dimethyl-3-hydroxybenzoic acid

[0068] Oxidation inhibitor:

[0069] 0.3% TEA salt of cocoyl glutamate

[0070] 0.3% 2-methyl-3-phenylacrolein

[0071] 0.2% sodium hexametaphosphate

[0072] pH regulator:

[0073] 0.3% potassium hydrogen phthalate.

[0074] Defoamer:

[0075] 0.005% silicone defoamer

[0076] 47.395% deionized water

[0077] The characteristic parameters of the liquid cooling working medium in this example are: freezing point -35°C, pH value 8.5, and 831 impurities above 25 μm.

[0078] Example 3

[0079] A long-life and ultra-clean liquid cooling working medium for a fluid circulation thermal control system of a space satellite, consisting of the following components:

[0080] Antifreeze:

[0081] 45% ethylene glycol

[0082] 5% ethanol

[0083] Corrosion inhibitor:

[0084] 0.5% 2-ethyl-substituted lanolinic acid

[0085] 0.5% ethylenediaminetetramethylenephosphonic acid

[0086] 0.5% mono-n-dodecyl phosphate

[0087] Oxidation inhibitor:

[0088] 0.3% TEA salt of cocoyl glutamate

[0089] 0.3% 2-methyl-3-phenylacrolein

[0090] 0.2% sodium hexametaphosphate

[0091] pH regulator:

[0092] 0.4% potassium hydrogen phthalate.

[0093] Defoamer:

[0094] 0.005% silicone defoamer

[0095] 47.295% deionized water

[0096] The characteristic parameters of the liquid cooling medium of this embodiment are: freezing point -40°C, pH value 8.5, and 864 particles larger than 25 μm.

[0097] Example 4

[0098] A long-life, ultra-clean liquid cooling medium for a space satellite fluid circulation thermal control system, comprising the following components:

[0099] antifreeze:

[0100] 45% ethylene glycol

[0101] 5% ethanol

[0102] Corrosion inhibitors:

[0103] 0.5% 1-(trimethylsilyl)-1H-benzotriazole

[0104] 0.5% 2-ethyl-2,5,5-trimethylhexanoic acid

[0105] 0.5% 2,5-dimethyl-3-hydroxybenzoic acid

[0106] Oxidation inhibitors:

[0107] 0.3% C10-13-benzenesulfonic acid-alkyl derivative TEA salt

[0108] 0.3% 3-carboxy-4-[2-(trimethylaminopentyl)ethyl]phenol 0.2% sodium hexametaphosphate

[0109] pH adjuster:

[0110] 0.4% potassium hydrogen phthalate.

[0111] Defoaming agent:

[0112] 0.005% silicone defoamer

[0113] 47.295% deionized water

[0114] The characteristic parameters of the liquid cooling medium of this embodiment are: freezing point -40°C, pH value 8.5, and 903 particles larger than 25 μm.

[0115] Example 5

[0116] A long-life, ultra-clean liquid cooling medium for a space satellite fluid circulation thermal control system, comprising the following components:

[0117] antifreeze:

[0118] 45% ethylene glycol

[0119] 5% ethanol

[0120] Corrosion inhibitor:

[0121] 0.5% 2-ethyl-substituted lanolinic acid

[0122] 0.5% ethylenediaminetetramethylenephosphonic acid

[0123] 0.5% mono-n-dodecyl phosphate

[0124] Oxidation inhibitor:

[0125] 0.3% C10-13-benzenesulfonic acid-alkyl derivative TEA salt

[0126] 0.3% 3-carboxy-4-[2-(trimethylammonium pentyl)ethyl]phenol ester 0.2% sodium hexametaphosphate

[0127] pH regulator:

[0128] 0.4% potassium hydrogen phthalate.

[0129] Defoamer:

[0130] 0.005% silicone defoamer

[0131] 47.295% deionized water

[0132] The characteristic parameters of the liquid cooling working fluid in this example are: freezing point -40°C, pH value 8.5, and 891 impurities above 25μm.

[0133] Example 6

[0134] The long-life, ultra-clean liquid cooling working fluid for the fluid circulation thermal control system of aerospace satellites consists of the following components:

[0135] Antifreeze:

[0136] 45% ethylene glycol

[0137] 5% ethanol

[0138] Corrosion inhibitor:

[0139]

[0140] Oxidation inhibitor:

[0141]

[0142]

[0143] pH regulator:

[0144] 0.4% potassium hydrogen phthalate.

[0145] Defoaming agent:

[0146] 0.005% silicone defoamer

[0147] 47.295% deionized water

[0148] The characteristic parameters of the liquid cooling medium of this embodiment are: freezing point -40°C, pH value 8.5, and 1032 particles larger than 25 μm.

[0149] Example 7

[0150] A long-life, ultra-clean liquid cooling medium for a space satellite fluid circulation thermal control system, comprising the following components:

[0151] antifreeze:

[0152] 45% ethylene glycol

[0153] 5% ethanol

[0154] Corrosion inhibitors:

[0155]

[0156] Oxidation inhibitors:

[0157]

[0158] pH adjuster:

[0159] 0.4% potassium hydrogen phthalate.

[0160] Defoaming agent:

[0161] 0.005% silicone defoamer

[0162] 47.295% deionized water

[0163] The above ingredients were mixed according to the ratio and stirred evenly to obtain the mother liquor, and then the mother liquor was filtered through a 25 μm microporous membrane with an area of 100 cm 2 , speed 10L / h.

[0164] The characteristic parameters of the liquid cooling medium of this embodiment are: freezing point -40°C, pH value 8.5, and 0 excess particles larger than 25 μm.

[0165] Comparative Example 1

[0166] A liquid cooling medium without any additives, consisting of the following components:

[0167] antifreeze:

[0168] 40% ethylene glycol

[0169] 10% Ethanol

[0170] 50% Deionized Water

[0171] Comparative Example 2

[0172] A liquid cooling working medium without any additives, consisting of the following components:

[0173] Antifreeze:

[0174] 45% Ethylene Glycol

[0175] 5% Ethanol

[0176] 50% Deionized Water

[0177] Material Compatibility Test of Test Example 1

[0178] The test method refers to the Chinese mechanical industry standard JB / T 7901 - 2023 "Full Immersion Test Method for Uniform Corrosion of Metal Materials in Laboratory", and the compatibility test of the entire material system of the aerospace satellite fluid circulation thermal control system is carried out. It includes metal materials 1035 aluminum alloy, 6061 aluminum alloy, 6063 aluminum alloy, 4004 solder, 4043 solder, TA1 titanium alloy, TA2 titanium alloy. During the test, they are separated by insulating washers to form a test piece bundle; non - metal materials ethylene propylene diene monomer rubber, fluororubber, and polytetrafluoroethylene are placed separately.

[0179] All metal test pieces are standard test pieces with a size of length × width × thickness of 50mm × 25mm × 3mm. The sizes of non - metal materials ethylene propylene diene monomer rubber and fluororubber are 1 - cm - diameter rings, and polytetrafluoroethylene is a standard test piece with a size of length × width × thickness of 50mm × 25mm × 3mm. Before the test, the metal test pieces are polished with sandpaper, wiped with alcohol cotton, weighed and the surface area is measured after drying. Then the test pieces are placed in a test container made of polytetrafluoroethylene to make the metal test pieces fully contact with the heat - transfer working medium. The test temperatures are selected as two temperature points of 20°C and 70°C to evaluate the compatibility of the liquid cooling working medium with materials when operating at different temperatures. The test periods are set as 336h and 365 days respectively, where 365 days is the life test. After the test, each material is taken out, wiped with alcohol cotton, and weighed after drying. The compatibility of metal materials is expressed by the corrosion rate, and the calculation formula is Formula 1. The compatibility of non - metal materials is expressed by mass change and volume change. The calculation formula for the volume change rate is Formula 2:

[0180]

[0181] In the formula, R - corrosion rate, mm / a

[0182] M – mass of the specimen before the test, g

[0183] M t– Mass of the specimen after the test, g

[0184] S – Total area of the specimen, cm 2

[0185] T – Test time, h

[0186] D – Density of the material, kg / m 3

[0187]

[0188] Wherein, m1 is the original mass of the specimen in air, mg

[0189] m2 is the original mass of the specimen in water, mg

[0190] m3 is the mass of the specimen in air after being immersed in the liquid, mg

[0191] m4 is the mass of the specimen in water after being immersed in the liquid, mg

[0192] This method simulates the actual operating conditions of the thermal control system, examines the compatibility of the entire material system in direct contact with the liquid cooling working medium, and evaluates it by the corrosion rate. The results of the test period of 336 h are shown in Table 1, and the results of the test period of 365 days are shown in Table 2.

[0193] Table 1 Results of 336 h Compatibility Test

[0194]

[0195] Note: In the second column of the above table, the tested materials are represented by codes, which have been marked previously, and the same applies hereinafter.

[0196] Table 2 Results of 365 d Compatibility Test

[0197]

[0198] It can be seen that for Examples 1 to 7 with corrosion inhibitors and oxidation inhibitors added, the compatibility data at 365 d and 336 h are not much different, and for some materials, the compatibility data are even smaller. This is because according to Equation 1, the weight change before and after the test in the numerator is basically unchanged, but the time in the denominator increases. For Comparative Examples 1 to 2 without any additives added, the compatibility data at 365 d are significantly greater than those at 336 h, indicating that the materials are further corroded over a long period. In addition, high temperature will also accelerate corrosion. Only Examples 6 to 7 can control the compatibility of the entire material system at Grade I compatibility under the conditions of 20 °C and 70 °C for both 336 h and 365 d time periods, meeting the long-term operation requirements of the thermal control system.

[0199] Test Example 2 Foreign Substance Test

[0200] The excess material test refers to testing the number of particles in the liquid cooling fluid when it is just prepared and before any other tests are performed. The test is performed using a particle detector based on the light obscuration method. The specific operating method complies with the "2020 Edition of the Chinese Pharmacopoeia - Light Obscuration Method Insoluble Particle Detection Regulations". The test results are shown in Table 3 below.

[0201] Table 3 Redundancy detection results

[0202]

[0203] It can be seen that in the various solutions used in Example 7, the amount of excess matter with a size of 25 μm or more is zero, thus avoiding the risk of clogging the filter of the thermal control system.

[0204] Test Example 3 Gas Production Test

[0205] 1035 aluminum alloy, 6061 aluminum alloy, 6063 aluminum alloy, 4004 solder, 4043 solder, TA1 titanium alloy, and TA2 titanium alloy were fully immersed in a liquid cooling medium. The specimens were placed horizontally and supported by insulating brackets. The test was conducted at 20°C for one month. All containers were placed in a dedicated laboratory without additional disturbance. The test results after one month are recorded and shown in Table 4.

[0206] Table 4 One month gas production test results

[0207]

[0208]

[0209] Test Example 4: Pressure Test

[0210] Liquid coolant was filled into the thermal control system's cold plate, made of 6061 aluminum alloy, ensuring it was completely filled. One of the cold plate's two inlets and outlets was sealed, and the other was connected to a pressure gauge. Once the entire cold plate was filled with liquid coolant, it was kept sealed and placed at room temperature and pressure. The pressure gauge readings were monitored and recorded monthly for one year. The results are shown in Table 5.

[0211] Table 5 Stress test results

[0212]

[0213]

[0214] It can be seen from the above examples and comparative examples that the liquid cooling working fluids prepared in Examples 1 to 7, due to the addition of corrosion inhibitors and oxidation inhibitors, have significantly better material compatibility than the liquid cooling working fluids without any additives prepared in Comparative Examples 1 to 2. The gas generation situation and pressure test results of the liquid cooling working fluids prepared in Examples 1-7 are significantly better than those of the liquid cooling working fluids without any additives prepared in Comparative Examples 1 to 2.

[0215] Moreover, the liquid cooling working fluid prepared in Example 7, due to the microfiltration membrane filtration operation, has better index of impurities larger than or equal to 25μm than the liquid cooling working fluid prepared in Example 6, with the number being 0, which can avoid clogging the filter of the thermal control system.

[0216] Although the present invention has been described in detail with general descriptions and specific embodiments above, on the basis of the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of the present invention claimed.

Claims

1. A long-life and ultra-clean liquid cooling working medium, characterized in that, It contains the following components: deionized water, antifreeze, corrosion inhibitor, oxidation inhibitor, pH regulator, defoamer; Among them, the antifreeze is a mixture of saturated monohydric alcohols and saturated dihydric alcohols.

2. The long-life, ultra-clean liquid cooling working medium according to claim 1, characterized in that, The saturated monohydric alcohol is one or more of methanol, ethanol, and propanol; the saturated dihydric alcohol is one or more of ethylene glycol, 1,2-propanediol, and 1,3-propanediol.

3. The long-life and ultra-clean liquid cooling working medium according to claim 2, wherein, The antifreeze is a mixture of ethylene glycol and ethanol with a mass ratio of 9:1 to 6.

4. The long-life and ultra-clean liquid cooling working medium according to any one of claims 1-3, characterized in that The corrosion inhibitor is two or more of 1-(trimethylsilyl)-1H-benzotriazole, 2-ethyl-2,5,5-trimethylhexanoic acid, monon-dodecyl phosphate, 2-ethyl-caprylic acid, 2,5-dimethyl-3-hydroxybenzoic acid, and ethylenediaminetetramethylenephosphonic acid; Preferably, the corrosion inhibitor is selected from one of the following combinations: A) A combination of 1-(trimethylsilyl)-1H-benzotriazole, 2-ethyl-2,5,5-trimethylhexanoic acid, and 2,5-dimethyl-3-hydroxybenzoic acid; B) A combination of 2-ethyl-caprylic acid, ethylenediaminetetramethylenephosphonic acid, and monon-dodecyl phosphate; C) A combination of 1-(trimethylsilyl)-1H-benzotriazole, 2-ethyl-2,5,5-trimethylhexanoic acid, 2,5-dimethyl-3-hydroxybenzoic acid, 2-ethyl-caprylic acid, ethylenediaminetetramethylenephosphonic acid, and monon-dodecyl phosphate.

5. The long-life and ultra-clean liquid cooling working medium according to claim 4, characterized in that, The oxidation inhibitor is a mixture of an organic compound type oxidation inhibitor and an inorganic compound type oxidation inhibitor with a mass ratio of 1:0.3 to 0.8; Among them, the organic compound type oxidation inhibitor is one or more of cocoyl glutamate TEA salt, a compound of C10-16-alkylbenzenesulfonic acid and triethanolamine, a TEA salt of C10-13-benzenesulfonic acid-alkyl derivative, sodium gluconate, 3-carboxy-4-[2-(trimethylaminopentyl)ethyl]phenol ester, and 2-methyl-3-phenylacrolein; The inorganic compound type oxidation inhibitor is one or more of sodium sulfite, sodium bisulfite, and sodium hexametaphosphate.

6. The long-life and ultra-clean liquid cooling working medium according to any one of claims 1-3, characterized in that The pH regulator is one or more of borax, potassium hydrogen phthalate, sodium bicarbonate, disodium hydrogen phosphate, and sodium dihydrogen phosphate; And / or, the defoamer is one or more of polyether defoamers, silicone defoamers, and higher alcohol defoamers.

7. The long-life and ultra-clean liquid cooling working medium according to any one of claims 1-3, characterized in that, The liquid cooling working medium, by mass percentage, contains the following components: The appropriate amount is based on adjusting the pH value of the heat transfer working medium to 8.0 - 10.

0.

8. The long-life and ultra-clean liquid cooling working medium according to claim 7, characterized in that, The liquid cooling working medium, by mass percentage, contains the following components: The appropriate amount is based on adjusting the pH value of the heat transfer working medium to 8.0 - 10.

0.

9. The preparation method of the long-life and ultra-clean liquid cooling working medium according to any one of claims 1-8, characterized in that, It includes the following steps: Mix each component according to the ratio and stir evenly to obtain a mother liquor, and then filter the mother liquor through a 25μm microporous membrane to obtain it.

10. The application of the long-life and ultra-clean liquid cooling working medium according to any one of claims 1-8, or the long-life and ultra-clean liquid cooling working medium prepared by the preparation method of claim 9 in the fluid circulation thermal control system of a space satellite.

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