Search

CN-121518115-B - Fluorine-free flame-retardant two-phase cooling liquid and preparation method and application thereof

CN121518115BCN 121518115 BCN121518115 BCN 121518115BCN-121518115-B

Abstract

The invention discloses a fluoride-free flame-retardant two-phase cooling liquid and a preparation method and application thereof, wherein the cooling liquid comprises, by mass, 75-85 parts of a basic phase-change agent, 3-15 parts of a phase-change regulator, 4-8 parts of a flame-retardant stabilizer and 2-4 parts of an interface modifier, wherein the basic phase-change agent is a binary eutectic mixture formed by decanoic acid and lauric acid, the phase-change regulator is a compound of isoamyl alcohol and propylene glycol, and the flame-retardant stabilizer is a compound of triphenyl phosphate and magnesium hydroxide. The cooling liquid is completely fluorine-free, and realizes comprehensive excellent performances of adjustable phase transition temperature, high phase transition latent heat, high flame retardant grade, stable long-term operation, good compatibility with materials and the like through the synergistic effect of the components. The cooling liquid is particularly suitable for an immersed liquid cooling system integrated with an intelligent regulation algorithm, and can be widely applied to efficient and safe heat dissipation in extreme heat load scenes such as an ultra-high power AI server, an energy storage battery, a high-power semiconductor and the like.

Inventors

  • QIN GUOQIANG
  • SUN HAIWANG
  • WANG XINGHAO
  • LIU XINGNAN
  • ZHOU MENG

Assignees

  • 天津提尔科技有限公司

Dates

Publication Date
20260508
Application Date
20260115

Claims (8)

  1. 1. The fluorine-free flame-retardant two-phase cooling liquid is characterized by comprising, by mass, 75-85 parts of a basic phase change agent, 3-15 parts of a phase change regulator, 4-8 parts of a flame-retardant stabilizer and 1-4 parts of an interface modifier; wherein the basic phase change agent is a binary eutectic mixture formed by capric acid and lauric acid; the phase change regulator is a compound of isoamyl alcohol and propylene glycol; the flame retardant stabilizer is a compound of triphenyl phosphate and magnesium hydroxide; the mass ratio of the capric acid to the lauric acid is 6:4-7:3; the interface modifier is a compound of a silane coupling agent KH570 and polyethylene glycol monomethyl ether; the mass ratio of the silane coupling agent KH570 to the polyethylene glycol monomethyl ether is 1:1-1:1.2.
  2. 2. The fluorine-free flame-retardant two-phase cooling liquid according to claim 1, wherein the mass ratio of isoamyl alcohol to propylene glycol is 1:2-1:3.
  3. 3. The fluorine-free flame retardant two-phase cooling liquid according to claim 1, wherein the mass ratio of the triphenyl phosphate to the magnesium hydroxide is 1:1-1:2.
  4. 4. A method for preparing the fluorine-free flame-retardant two-phase cooling liquid according to any one of claims 1 to 3, comprising the following steps: S1, raw material pretreatment, namely vacuum drying a basic phase change agent raw material, rectifying and purifying the phase change regulator raw material, crushing solid components in a flame retardant stabilizer raw material, mixing the crushed solid components with a liquid component and part of an interface modifier for surface modification, and mixing the interface modifier raw material; S2, preparing a basic phase change agent, namely mixing the pretreated raw materials of the basic phase change agent in proportion, heating and stirring to form a uniform eutectic mixture, and then cooling; s3, composite modification, namely heating and melting the basic phase-change agent prepared in the step S2, sequentially adding the pretreated phase-change regulator, the flame retardant stabilizer and the interface modifier, and stirring in sections to uniformly disperse the components; s4, degassing, namely degassing the mixture obtained in the step S3 under the conditions of heating and vacuum; s5, filtering, namely filtering the degassed liquid to obtain a finished product cooling liquid.
  5. 5. The preparation method of the flame retardant stabilizer, as set forth in claim 4, wherein in the step S1, the basic phase-change agent raw material is vacuum-dried under the conditions of 75-80 ℃ and 0.09MPa for 1.5-2 hours, and the flame retardant stabilizer raw material is surface-modified under the conditions of mixing the crushed magnesium hydroxide with triphenyl phosphate and a silane coupling agent KH570 accounting for 1-2% of the total mass of the two, and treating for 20min at the stirring rate of 60-65 ℃ and 450-500 rpm.
  6. 6. The method according to claim 4, wherein in step S2, the heating temperature is 70-80 ℃, the stirring speed is 400-500rpm, and the stirring time is 30-40min.
  7. 7. The preparation method according to claim 4, wherein in the step S3, the basic phase-change agent is heated to 50-60 ℃ to melt, the phase-change modifier is added and stirred at a stirring speed of 500-600rpm for 15-20min, the flame-retardant stabilizer is added and then the stirring speed is increased to 800-1000rpm for 25-30min, the interface modifier is added and then the stirring speed of 800-1000rpm is maintained for 30-35min, the degassing treatment temperature is 65-75 ℃ and the vacuum degree is-0.09-0.08 MPa, the stirring speed is 300-350rpm and the time is 30-35min in the step S4.
  8. 8. Use of a fluorine-free flame retardant two-phase cooling fluid according to any of claims 1-3 in an immersion liquid cooling system.

Description

Fluorine-free flame-retardant two-phase cooling liquid and preparation method and application thereof Technical Field The invention relates to a fluoride-free flame-retardant two-phase cooling liquid and a preparation method and application thereof, and belongs to the technical field of cooling liquid preparation. Background In the face of the extreme heat dissipation challenge brought by breakthrough of the power density of electronic equipment, the two-phase immersion liquid cooling technology becomes the core direction because of the advantage of utilizing the latent heat of phase change, but the development of the technology is limited by the key defects of fluorine-containing cooling liquid and fluorine-free cooling liquid. Although the fluorine-containing cooling liquid is a current mainstream high-performance medium, the global warming potential is as high as tens of thousands, and is listed as a reduction object by international convention, and faces huge environmental protection and policy forbidden risks, the complex synthesis process and the scarce raw materials of the fluorine-containing cooling liquid cause extremely high cost which can be tens of times that of the traditional cooling liquid, and the potential safety hazard of the extremely toxic gas generated by thermal decomposition exists. The alcohol, hydrocarbon and ester fluorine-free cooling liquid developed for avoiding the problems exposes a new short plate, wherein the alcohol has low latent heat of phase change generally, a temperature control window is misaligned, the hydrocarbon has low flash point and brings inflammable and explosive risks, and the ester is easy to hydrolyze and corrode metals and separate phases. Most of the fluorine-free substitutes cannot reach the forced flame retardant standard in terms of safety, secondary pollution is caused by adding halogen flame retardants, and the problems of explosion boiling, excessive phase transition temperature drift, excessive latent heat attenuation, sealing failure caused by poor compatibility and the like are also commonly faced in long-term operation. More deeply, the existing heat dissipation system architecture directly adopts the design of adapting to fluorine-containing cooling liquid, and the characteristic of non-fluorine medium cannot be adapted, so that a series of system-level defects such as insufficient natural circulation power, forced circulation failure stability, intelligent regulation algorithm deficiency, slow safety monitoring response and the like are caused. Therefore, the whole field is deeply in the multiple contradictions of environmental protection, safety, performance, cost and system suitability which are difficult to be compatible, and a fundamental technical innovation capable of systematically solving all pain points is needed. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a fluoride-free flame-retardant two-phase cooling liquid which comprises, by mass, 75-85 parts of a basic phase-change agent, 3-15 parts of a phase-change regulator, 4-8 parts of a flame-retardant stabilizer and 2-4 parts of an interface modifier, wherein the basic phase-change agent is a binary eutectic mixture formed by decanoic acid and lauric acid, the phase-change regulator is a compound of isoamyl alcohol and propylene glycol, and the flame-retardant stabilizer is a compound of triphenyl phosphate and magnesium hydroxide. Preferably, the mass ratio of the decanoic acid to the lauric acid is 6:4-7:3, and more preferably is 6.5:3.5. Preferably, the mass ratio of the isoamyl alcohol to the propylene glycol is 1:2-1:3. Preferably, the mass ratio of the triphenyl phosphate to the magnesium hydroxide is 1:1.5-1:2. Preferably, the magnesium hydroxide has a particle size of less than or equal to 5 μm. Preferably, the interface modifier is a compound of a silane coupling agent KH570 and polyethylene glycol monomethyl ether, and the mass ratio of the silane coupling agent KH570 to the polyethylene glycol monomethyl ether is 1:1. Preferably, the kinematic viscosity of the cooling liquid at 25 ℃ is 3-5mm < 2 >/s, the phase transition temperature of the cooling liquid is 35-45 ℃, the phase transition latent heat is more than or equal to 180kJ/kg, the flame retardant grade of the cooling liquid reaches UL94V-0 grade, the ignition point is more than or equal to 300 ℃, the corrosion rate of the cooling liquid to metal is less than or equal to 0.003mm < a >, and the swelling rate of the cooling liquid to a fluororubber sealing piece is less than or equal to 3%. The invention also provides a preparation method of the fluoride-free flame-retardant two-phase cooling liquid, which comprises the following steps of S1, preprocessing raw materials, rectifying and purifying the raw materials of the phase change regulator, mixing solid components in the raw materials of the flame retardant stabilizer with liquid components and part of interface modifiers for