CN-122011391-A - Multi-branched silicone oil for single-phase immersed cooling liquid and preparation method thereof

Abstract

The application provides multi-branched silicone oil for single-phase immersed cooling liquid and a preparation method thereof, wherein the structure of the multi-branched silicone oil comprises silicate central functional groups; and at least three siloxane segments attached to the silicate central functional group, the siloxane segments having long chain alkyl groups grafted thereto. By introducing a multi-branched structure taking a silicate ester center functional group as a core into a silicone oil molecular structure and introducing long-chain alkyl into a silicone chain segment, the obtained silicone oil can simultaneously have higher molecular weight and lower system viscosity and keep lower dielectric constant, so that the silicone oil has excellent flowing property while keeping good electrical insulation property and chemical stability, and is more suitable for being used as cooling liquid in a single-phase immersed liquid cooling system.

Inventors

• LIU LEI
• HE CHAO
• HE LIAN
• PAN KEYI
• Shu Siru
• CAI SIYU
• LIU PEI

Assignees

• 湖北第二师范学院

Dates

Publication Date

20260512

Application Date

20260319

Claims (10)

1. 1. A multi-branched silicone oil for single-phase immersion cooling liquid, characterized in that the structure of the multi-branched silicone oil comprises: silicate central functional groups; And at least three siloxane segments attached to the silicate central functional group, the siloxane segments having long chain alkyl groups grafted thereto.
2. 2. The multi-branched silicone oil according to claim 1, wherein the silicate central functional group comprises at least one of an orthosilicate group, a disilicate group linked by a C1-C4 alkylene group, an oligosilicate group.
3. 3. The multi-branched silicone oil according to claim 1, wherein the siloxane segment comprises 1 to 20-Si-O-segments.
4. 4. The multi-branched silicone oil according to claim 1, wherein the long-chain alkyl group is a C6 to C16 alkyl group.
5. 5. A method of preparing a multi-branched silicone oil for a single phase submerged cooling fluid, comprising the steps of: s1, carrying out polycondensation reaction on polydentate silicate and a long-chain alkyl siloxane double-end capping agent under the action of an acid catalyst to obtain a long-chain alkyl-containing multi-branched siloxane intermediate; S2, carrying out end-capping reaction on the multi-branched siloxane intermediate and a methyl end capping agent to obtain the multi-branched silicone oil.
6. 6. The method according to claim 5, wherein in the step S1, The polydentate silicate comprises at least one of methyl orthosilicate, ethyl orthosilicate, propyl orthosilicate, methyltrimethoxysilane, dimeric methyl orthosilicate, trimeric methyl orthosilicate, bis (trimethoxysilyl) ethane and bis (methyldimethoxysilyl) ethane; the long-chain alkyl siloxane double-sealing agent comprises at least one of tetramethyl dihexyl disiloxane, tetramethyl dioctyl disiloxane, tetramethyl didecyl disiloxane, tetramethyl didodecyl disiloxane, tetramethyl ditetradecyl disiloxane and tetramethyl ditetradecyl disiloxane; The acid catalyst comprises at least one of strong acid sulfonic acid resin and sulfuric acid zirconia.
7. 7. The method according to claim 5, wherein in the step S1, The molar ratio of the polydentate silicate to the long-chain alkyl siloxane double-end socket agent is 1:4-6; The dosage of the acid catalyst is 0.1-5 wt% of that of the polydentate silicate.
8. 8. The method according to claim 5, wherein in the step S1, The conditions of the polycondensation reaction comprise the reaction for 2-12 hours at 65-150 ℃.
9. 9. The method according to claim 5, wherein in the step S1, The system is also added with a chain extender, the chain extender comprises dimethyl dimethoxy silane, and the molar ratio of the polydentate silicate to the chain extender is 1:2-10.
10. 10. The method according to claim 5, wherein the molar ratio of the methyl end-capping agent in the step S2 to the polydentate silicate in the step S1 is 1:1-4, and the methyl end-capping agent comprises at least one of hexamethyldisiloxane and trimethylchlorosilane.

Description

Multi-branched silicone oil for single-phase immersed cooling liquid and preparation method thereof Technical Field The application relates to the technical field of cooling liquid, in particular to multi-branched silicone oil for single-phase immersed cooling liquid and a preparation method thereof. Background The immersion liquid cooling technology is a technical scheme for realizing heat dissipation by completely immersing electronic equipment in cooling liquid, wherein the cooling liquid can be directly contacted with a heating element, and heat is brought out of the system through convection circulation of the liquid. Compared with the traditional air cooling heat dissipation mode, the immersed liquid cooling utilizes the higher heat capacity and heat conduction capacity of the liquid, and can remarkably improve the heat exchange efficiency, thereby breaking through the heat dissipation bottleneck caused by the limited heat conduction efficiency of air. With the rapid development of technologies such as artificial intelligence, cloud computing and 5G communication, the computing density of a data center is continuously improved, the power consumption of a chip is continuously increased, and the heat dissipation demand generated by the technology is rapidly increased, so that the immersed liquid cooling technology gradually becomes an important development direction of heat dissipation of a high-density data center. According to whether the cooling liquid is subjected to phase change in the working process, the immersed liquid cooling technology is generally divided into two technical routes of single-phase immersed liquid cooling and phase-change immersed liquid cooling. In the single-phase immersed liquid cooling system, the cooling liquid is always kept in a liquid state in the whole circulation process, heat generated in the operation process of equipment is taken away through the circulation flow of the cooling liquid and higher specific heat capacity, and the phase-change immersed liquid cooling system utilizes the latent heat absorbed by the gas-liquid phase change of the cooling liquid when the cooling liquid is heated to realize heat dissipation and needs to be matched with a steam condensation recovery device to perform working medium circulation. Compared with the single-phase immersed liquid cooling system, the single-phase immersed liquid cooling system is simpler in structure, better in operation stability and lower in maintenance cost, and therefore the single-phase immersed liquid cooling system gradually occupies the mainstream position in the liquid cooling application of the data center. In a single-phase immersion liquid cooling system, the cooling liquid needs to have good electrical insulation performance, low viscosity, high chemical stability and high thermal stability. The common immersion type cooling liquid base liquid at present mainly comprises fluoridized liquid, carbon-based synthetic oil, organic silicone oil and the like. The fluorinated liquid generally has good electrical insulation performance and thermal stability, but has higher cost and environmental compatibility problem of partial products, and the carbon-based synthetic oil has lower structural stability and flash point, and is easy to be oxidized and degraded in the long-term use process, thus influencing the service life. Silicone oil is considered as a potential immersed liquid-cooling base liquid because of good chemical inertness, electrical insulation performance and wide use temperature range. At present, silicone oil systems used for liquid cooling systems mostly use low-viscosity methyl silicone oil as base oil, and the heat conducting property of the silicone oil systems is improved by adding inorganic filler or introducing aryl silicone oil and the like into the systems. For example, the patent publication No. CN116731689A improves the heat transfer capability by incorporating inorganic fillers into the silicone oil system, and the patent publication No. CN119410346A improves the system performance by incorporating aryl silicone oils. Furthermore, the patent publication No. CN119613724A improves system performance by introducing long carbon chain alkyl groups at the chain ends or side chains of the silicone oil molecules. On the other hand, in order to obtain a silicone oil system with higher stability, it is generally necessary to use a silicone oil polymer with a relatively high molecular weight, but as the molecular weight of the silicone oil increases, the viscosity of the system also increases significantly, thereby affecting the flow property of the cooling liquid in the circulation system. In order to reduce the viscosity of the system, there is a conventional method of diluting a silicone oil system by adding a carbon-based oil-based material such as mineral oil. However, due to polarity difference between different types of oil products, system delamination or liquid separation phenomenon eas