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Preparation method of phase-change composite material with high heat conductivity and high density

A technology of phase-change composite materials and high thermal conductivity, which is applied in the direction of heat exchange materials, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve the problems of low thermal conductivity and low density of composite phase-change materials, etc. To achieve the effect of improving thermal conductivity, rich raw materials, and exerting heat storage capacity

Inactive Publication Date: 2015-07-15
HARBIN INST OF TECH
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  • Summary
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the thermal conductivity of a single phase change material is low, and the density of a composite phase change material with expanded graphite as a thermal conductivity enhancement phase is not high, and a phase change material with high thermal conductivity and high density is provided. Method for preparing variable composite materials

Method used

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  • Preparation method of phase-change composite material with high heat conductivity and high density
  • Preparation method of phase-change composite material with high heat conductivity and high density
  • Preparation method of phase-change composite material with high heat conductivity and high density

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specific Embodiment approach 1

[0020] Specific Embodiment 1: In this embodiment, a method for preparing a phase-change composite material with high thermal conductivity and high density is realized according to the following steps:

[0021] 1. Reinforcement pretreatment: using expandable graphite as raw material, heat it in a muffle furnace at a temperature of 750-1200°C for 30-60s to obtain worm-like expanded graphite;

[0022] 2. Pretreatment of the matrix material: put the solid powder of erythritol in a beaker, heat up to 120-130°C, and stir at the same time at a stirring rate of 60-200r / min to obtain liquid erythritol;

[0023] 3. Two-phase mixing: add worm-like expanded graphite to liquid erythritol according to the mass ratio of liquid erythritol and worm-like expanded graphite at a ratio of 1: (24-199), keep warm at 120-130°C, and keep warm for 0.5- 2h, stirring at the same time, stirring rate 300 ~ 650r / min, to obtain a two-phase mixture;

[0024] 4. Ultrasonic oscillation: raise the temperature o...

specific Embodiment approach 2

[0033] Embodiment 2: This embodiment is different from Embodiment 1 in that: the heating in the muffle furnace with a temperature of 900° C. for 45 s is described in Step 1. Others are the same as the first embodiment.

specific Embodiment approach 3

[0034] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the stirring rate in Step 2 is 120 r / min. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a phase-change composite material with high heat conductivity and high density, relates to a preparation method of a phase-change composite material with high heat conductivity and high density, and aims at solving the problems that a single phase-change material is relatively low in heat conductivity, and a composite phase-change material employing expanded graphite as a heat-conducting strengthening phase is low in density. The preparation method comprises the following steps: 1, pretreatment of a reinforcement body; 2, pretreatment of a matrix material; 3, two-phase mixing; 4, ultrasonic oscillation; and 5, consolidation and formation. With erythritol as a phase-change material, and expanded graphite as the heat-conducting strengthening phase, the heat conductivity of the phase-change material can be greatly improved; and the heat exchange efficiency is improved. Two-phase blending is promoted by an ultrasonic method; a graphite skeleton of the expanded graphite is decomposed at a certain extent; liquid sugar alcohol can enter an internal micro-pore; the obtained composite phase-change material has high density; and the reparation method can be applied to the field of preparation of the composite phase-change material.

Description

technical field [0001] The invention relates to a preparation method of a phase-change composite material with high thermal conductivity and high density. Background technique [0002] Thermal energy storage technology is a promising technology that can minimize energy loss, increase energy efficiency, and improve cost efficiency, so it is of great significance in the renewable utilization of resources. Using phase change materials to absorb or release heat energy in the process of constant temperature phase change is a good latent heat storage method, which has the advantages of high energy density, small heat transfer temperature difference, constant temperature heat source, and reusable. However, phase change materials usually have low thermal conductivity, generally between 0.1-1.0W / (m·K). Low thermal conductivity means that the material absorbs and releases heat slowly, and the heat transfer efficiency is low. Therefore, it is necessary to take certain measures to imp...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCY02P20/10
Inventor 张强郭启霖武高辉
Owner HARBIN INST OF TECH
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