CN-121991405-A - Eutectic phase change composite aerogel for efficient thermal energy management and preparation method thereof

Abstract

The invention relates to eutectic phase change composite aerogel for efficient thermal energy management and a preparation method thereof, and belongs to the technical field of phase change materials. The aerogel is composed of phenylbenzobisoxazole fibers (PBO), eutectic Phase Change Materials (EPCM) and a heat conducting filler. EPCM is prepared by melt blending Stearic Acid (SA) with stearyl alcohol (OA). Aiming at the problems of low thermal conductivity and easy leakage of Phase Change Materials (PCMs), PBO fibers, polyvinyl alcohol (PVA) and EPCM are compounded, a fiber network is optimized through physical crosslinking, a compact porous structure is formed, and the leakage prevention capability is obviously enhanced. Meanwhile, liquid metal Ga is introduced as a light-heat conversion filler, so that the material is endowed with excellent light-heat conversion performance. The obtained eutectic phase-change composite aerogel has high mechanical property, high thermal conductivity, stable light-heat conversion capability and excellent heat storage capability.

Inventors

• ZHANG XUEZHONG
• YAN GUILONG
• WANG LI
• CHENG DINGXIAO
• WU YUANPENG
• XIANG DONG
• ZHONG CHENG
• ZHANG YUXIN
• YANG YANHONG
• ZHANG JIE
• LI DONG

Assignees

• 西南石油大学

Dates

Publication Date

20260508

Application Date

20260410

Claims (8)

1. 1. A method for preparing eutectic phase change composite aerogel for efficient heat energy management is characterized in that, S1, adding edge graphene oxide (EOG) into a mixed solvent consisting of absolute ethyl alcohol and deionized water, and uniformly mixing to obtain an EOG solution, carrying out probe ultrasonic treatment on the EOG solution to obtain an EOG coated Ga suspension, namely EGa suspension; s2, blending stearyl alcohol (OA) and Stearic Acid (SA), and then carrying out ultrasonic treatment to obtain an OA/SA eutectic Phase Change Material (PCMs), which is named EPCM; s3, adding the poly-p-Phenylene Benzobisoxazole (PBO) microfiber into Methane Sulfonic Acid (MSA) and trifluoroacetic acid (TFA) mixed acid, and stirring and mixing to obtain PBO nanofiber solution; S4, adding polyvinyl alcohol (PVA) into Methane Sulfonic Acid (MSA), stirring and blending to obtain a PVA acid solution, adding EGa powder, the PVA acid solution, ethyl Acetate (EA) and deionized water into the PBO nanofiber solution, stirring and dispersing uniformly to form viscous acid sol, pouring the viscous acid sol into a culture dish, carrying out gelation and curing to obtain EGa/PBO/PVA composite acid gel, carrying out solvent replacement on the acid gel until the pH value is 7 to form EGa/PBO/PVA composite alcohol gel, and carrying out freeze drying on EGa/PBO/PVA composite alcohol gel to obtain EGa/PBO/PVA composite aerogel; S5, heating the EPCM until the EPCM is completely melted, immersing EGa/PBO/PVA composite aerogel in the EPCM, and naturally cooling the EPCM/EGa/PBO/PVA eutectic phase-change composite aerogel after vacuum impregnation.
2. 2. The preparation method of the eutectic phase-change composite aerogel for efficient thermal energy management, which is disclosed in claim 1, is characterized in that the volume ratio of absolute ethyl alcohol to deionized water in S1 is 1:4, the specific condition of probe ultrasonic treatment in S1 is that 30min ultrasonic treatment is carried out under the condition of ice water bath, the specific condition of freeze drying in S1 is that the pressure is 2-10 Pa, the temperature is-60 ℃ and the time is 48 hours.
3. 3. The preparation method of the eutectic phase-change composite aerogel for efficient thermal energy management, which is disclosed in claim 1, is characterized in that the molar ratio of OA to SA in S2 is 3:7, the specific conditions of blending in S2 are oil bath temperature 80 ℃ and magnetic stirring for 2h, and the specific conditions of ultrasonic treatment in S2 are temperature 80 ℃ and time 30 min.
4. 4. The preparation method of the eutectic phase-change composite aerogel for efficient thermal energy management, which is disclosed in claim 1, is characterized in that the mass ratio of MSA to TFA mixed acid in S3 is 1:1, the stirring and mixing in S3 are carried out under the specific conditions of 400 rpm of mechanical stirring at room temperature for 36-72 h, and the concentration of the PBO nanofiber solution is 0.5wt%.
5. 5. The preparation method of the eutectic phase change composite aerogel for efficient thermal energy management, which is disclosed in claim 1, is characterized in that the mass ratio of MSA to PVA in S4 is 1:320, the specific condition of stirring and blending in S4 is that the stirring time is 6h, the specific condition of stirring and dispersing in S4 is that mechanical stirring is carried out for 5-10 min at the rotating speed of 350-400 rpm, the specific condition of gelation in S4 is that standing is carried out for 4h at room temperature, the specific condition of curing is that standing is carried out for 20h at room temperature, the specific condition of solvent replacement in S4 is that firstly replacement is carried out for 12h at 30-70 wt% of MSA under the acidic condition, then solvent replacement is carried out for 48-72 h by using 50wt% of tert-butyl alcohol (TBA), the specific condition of freeze drying in S4 is that the pressure is 2-10 Pa, the temperature is-60 ℃ and the time is 72h.
6. 6. The method for preparing the eutectic phase-change composite aerogel for efficient thermal energy management according to claim 1 is characterized in that the specific condition of heating to complete melting in the step S5 is 80 ℃, and the specific condition of vacuum impregnation in the step S5 is 12h.
7. 7. The eutectic phase change composite aerogel for efficient thermal energy management is characterized by being prepared by the preparation method of any one of claims 1-6.
8. 8. The eutectic phase change composite aerogel for efficient thermal energy management according to claim 7, wherein the eutectic phase change composite aerogel comprises a PBO nanofiber base material, a eutectic phase change material and a heat conducting filler, and has a three-dimensional network structure.

Description

Eutectic phase change composite aerogel for efficient thermal energy management and preparation method thereof Technical Field The invention relates to the technical field of phase change material preparation, in particular to eutectic phase change composite aerogel for efficient thermal energy management and a preparation method thereof. Background With the high integration of smart watches and health monitors, internal electronics are dense, resulting in severe heat accumulation. Meanwhile, industrial waste heat and photo-heat have the advantages of abundant reserves, wide distribution, environmental friendliness and the like, and are widely focused by people, but in the practical application process, the utilization rate of energy is low, and the supply and the demand are mismatched in time and space. Therefore, the phase-change energy storage technology effectively relieves the problem of space-time mismatch of energy supply and demand, improves the energy utilization rate, and realizes the 'double-carbon' target by aid of power. The core of the technology is PCMs, which can absorb or release a large amount of latent heat in the phase change process, and the temperature change in the process is relatively stable, so that the technology has great application potential in the fields of solar heat utilization, industrial waste heat recovery, electronic equipment heat management and the like. Among them, organic solid-liquid PCMs, such as fatty acids, esters and alcohols, promote their application in the fields of electronic equipment temperature control and photo-thermal utilization due to their advantages of higher phase transition enthalpy, proper phase transition temperature, low corrosiveness and stable performance. However, PCMs themselves generally have low thermal conductivity, are easy to leak, have poor light-heat conversion capability, and are difficult to flexibly adapt to various application scenes at a fixed phase transition temperature, so that further popularization and application of the PCMs are severely limited. Liquid Metal (LM) is an emerging metal material that has attracted considerable attention due to its unique physicochemical properties. In particular, liquid gallium (Ga) has great potential for development in thermal interface materials, electronic device cooling, and other applications requiring high thermal management due to its excellent thermal conductivity, high specific heat capacity, good flowability, and good plasticity. However, liquid metal Ga still presents some challenges in practical applications. Firstly, ga has a high surface tension, which makes it less compatible with the substrate, thus increasing the difficulty of the preparation process. Secondly, ga is easily oxidized, and the formation of an oxide layer not only reduces the fluidity thereof, but also affects the heat conducting property thereof. In addition, the easy leakage can cause short circuit, corrosion and other faults in the application of electronic components, so that the safety of equipment is seriously affected, and the problems limit the further development of the electronic components in the field of high-end thermal management. Disclosure of Invention The invention aims to provide eutectic phase change composite aerogel for high-efficiency thermal energy management and a preparation method thereof, which solve the inherent problems of solid-liquid PCMs in the prior art, such as easy leakage, low thermal conductivity and the like. The innovative eutectic phase change composite aerogel improves the thermal conductivity of solid-liquid PCMs by introducing PBO fibers. However, pure PBO fiber aerogels tend to have poor mechanical properties and excessive porosity, making them susceptible to leakage when used as support frameworks for PCMs. And the polyvinyl alcohol (PVA) is used as a high-molecular adhesive with high biocompatibility, no toxicity and low cost, and can optimize a fiber network through physical crosslinking to form a more compact porous structure. In addition, high-efficiency light-heat conversion fillers such as LM, gr, polypyrrole (PPy) and Polyaniline (PANI) are introduced into the composite system, so that the phase-change composite material can be endowed with excellent light-heat conversion capability. The invention relates to eutectic phase change composite aerogel for efficient thermal energy management and a preparation method thereof, and the eutectic phase change composite aerogel comprises the following steps: S1, adding edge graphene oxide (EOG) into a mixed solvent consisting of absolute ethyl alcohol and deionized water, and uniformly mixing to obtain an EOG solution. Carrying out probe ultrasonic treatment on the EOG solution to obtain an EOG coated Ga suspension, namely EGa suspension, centrifuging the EGa suspension, washing and freeze-drying to obtain EGa powder; s2, blending stearyl alcohol (OA) and Stearic Acid (SA), and then carrying out ultrasonic treatment to