CN-122011767-A - Low-heat-conductivity phase-change aerogel material and preparation method and application thereof

Abstract

The application discloses a low-heat-conductivity phase-change aerogel material and a preparation method and application thereof. The phase change enthalpy value of the material is 50J/g-110J/g, the phase change temperature is 0-60 ℃, and the heat conductivity coefficient is 0.08W/(m.K) -0.1W/(m.K). The novel low-heat-conductivity phase change material is produced by curing polydimethylsiloxane PDMS and phase change microcapsules. The phase-change aerogel material has the advantages of simple synthesis process, higher phase-change enthalpy value and good phase-change cycling stability. Has important application prospect in two aspects of heat energy collection and heat insulation temperature control.

Inventors

• SHI QUAN
• LU JIABAO
• LUO JIPENG
• YIN NAN

Assignees

• 中国科学院大连化学物理研究所

Dates

Publication Date

20260512

Application Date

20241111

Claims (6)

1. 1. A low heat conduction phase change aerogel material is characterized in that, The phase change enthalpy value of the low-heat-conductivity phase change aerogel material is 50J/g-110J/g; The phase transition temperature of the low-heat-conductivity phase transition aerogel material is 0-60 ℃; the heat conductivity coefficient of the low-heat-conductivity phase-change aerogel material is 0.08W/(m.K) -0.1W/(m.K).
2. 2. A method for preparing a phase-change aerogel material with low thermal conductivity as claimed in claim 1, The method comprises the following steps: And mixing n-hexane, polydimethylsiloxane, a curing agent, phase-change microcapsules and a template agent, performing compression molding, curing, washing with water and drying to obtain the low-heat-conductivity phase-change aerogel material.
3. 3. The method according to claim 2, wherein, The curing agent is SYLGARD 184DOW CORNING; The inorganic salt template agent is selected from any one of sodium chloride, potassium chloride, magnesium chloride, calcium chloride and aluminum chloride; The phase transition temperature of the phase transition microcapsule is 20-60 ℃; the phase change enthalpy value of the phase change microcapsule is 180-230J/g.
4. 4. The method according to claim 2, wherein, The mass ratio of the n-hexane to the polydimethylsiloxane is 5-10:1; The mass ratio of the polydimethylsiloxane to the curing agent is 10:1-2; The mass ratio of the polydimethylsiloxane to the phase-change microcapsule is 1:0.5-5; The mass ratio of the phase-change microcapsule to the inorganic salt template agent is 1:8-15.
5. 5. The method according to claim 2, wherein, The pressure of the compression molding is 1-5 mpa; The curing temperature is 60-120 ℃; And the curing time is 3-20 hours.
6. 6. A use of a low thermal conductivity phase change aerogel material as claimed in claim 1, As a heat-insulating and temperature-controlling material.

Description

Low-heat-conductivity phase-change aerogel material and preparation method and application thereof Technical Field The application relates to a low-heat-conductivity phase-change aerogel material and a preparation method and application thereof, and belongs to the field of phase-change materials. Background The development of novel efficient heat-insulating and temperature-controlling materials is critical to meet the increasing thermal management demands. The porous aerogel has the characteristics of heat insulation, temperature control and light weight and porosity, however, the traditional aerogel material has complex preparation cost and higher process cost, and restricts the commercial application of the aerogel material. The phase change material can absorb and release a great amount of latent heat during phase change while keeping the temperature unchanged, so that the phase change material can be used as a functional material for heat management to realize heat energy storage and temperature control. The method has wide application in heat energy collection, building temperature control and industrial waste heat recovery. The heat-insulating and temperature-controlling material has important application prospect, however, the existing heat-insulating and temperature-controlling material has high cost and complex preparation conditions, and cannot meet the requirement of large-scale application. Disclosure of Invention In view of the defects of complex synthesis process, high preparation cost and the like of the existing low-heat-conductivity porous aerogel material, the application requirements cannot be met. Therefore, the novel low-heat-conductivity porous phase change material is developed and synthesized, and the novel low-heat-conductivity porous phase change material has the characteristics of simple synthesis method, higher phase change enthalpy value, low heat conductivity coefficient and the like, and has important research and application values. According to the invention, the novel porous phase-change skeleton with low heat conductivity is prepared by combining the porous aerogel with the phase-change material, so that the combination of latent heat temperature control and aerogel temperature control is realized, and the effective temperature control under instantaneous high power can be satisfied. Meanwhile, the preparation conditions are mild, the process cost is low, and the method has a large-scale application scene. According to one aspect of the application, a low-heat-conductivity phase-change aerogel material is provided, and the phase-change enthalpy value of the low-heat-conductivity phase-change aerogel material is 50J/g-110J/g; The phase transition temperature of the low-heat-conductivity phase transition aerogel material is 0-60 ℃; the heat conductivity coefficient of the low-heat-conductivity phase-change aerogel material is 0.08W/(m.K) -0.1W/(m.K). According to another aspect of the present application, there is provided a method for preparing the phase-change aerogel material with low thermal conductivity, comprising the steps of: and uniformly mixing the phase-change microcapsule and the template agent, uniformly mixing the phase-change microcapsule and the template agent with Polydimethylsiloxane (PDMS) prepolymer diluted by normal hexane, and then carrying out compression molding treatment and vacuum curing treatment. And (3) carrying out water bath full desalting treatment on the solidified material, and drying to obtain the low-heat-conductivity phase-change material. And curing the polydimethylsiloxane PDMS prepolymer and the phase-change microcapsules to form a porous phase-change skeleton. Wherein, the template agent is washed by water to obtain a porous structure. Specifically, the method comprises the following steps: And mixing n-hexane, polydimethylsiloxane, a curing agent, phase-change microcapsules and a template agent, performing compression molding, curing, washing with water and drying to obtain the low-heat-conductivity phase-change aerogel material. The curing agent is SYLGARD 184DOW CORNING; the template agent is selected from any one of sodium chloride, potassium chloride, magnesium chloride, calcium chloride and aluminum chloride; The phase transition temperature of the phase transition microcapsule is 20-60 ℃; the phase change enthalpy value of the phase change microcapsule is 180-230J/g. The mass ratio of the n-hexane to the polydimethylsiloxane is 5-10:1; The mass ratio of the polydimethylsiloxane to the curing agent is 10:1-2; The mass ratio of the polydimethylsiloxane to the phase-change microcapsule is 1:0.5-5; The mass ratio of the phase-change microcapsule to the inorganic salt template agent is 1:8-15. The pressure of the compression molding is 1-5 mpa; The curing temperature is 60-120 ℃; And the curing time is 3-20 hours. According to another aspect of the present application, there is provided an application of the phase-change aerogel mat