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Process for synthesizing carbon-containing nano-tube compound phase transformation heat accumulating material

A nanotube composite and carbon nanotube technology, applied in heat exchange materials, chemical instruments and methods, fibrous fillers, etc., can solve problems such as low utilization rate of heat storage, poor heat transfer performance, wear or blockage, and achieve Conducive to industrialization, good stability, and the effect of improving thermal conductivity

Inactive Publication Date: 2009-10-21
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention discloses a synthesis method of a carbon nanotube / palmitic acid composite phase change heat storage material, which aims to overcome the poor heat transfer performance and low heat storage utilization rate of organic PCM in the prior art. When melting, solid particles of millimeter or micron size are easily precipitated in the mixed solution; when the composite phase change material with large particles transfers the stored energy, it is easy to cause defects such as wear or blockage

Method used

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  • Process for synthesizing carbon-containing nano-tube compound phase transformation heat accumulating material

Examples

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Embodiment 1

[0014] Example 1: Mix multi-walled carbon nanotubes with concentrated acid, wherein the volume ratio of concentrated nitric acid to concentrated sulfuric acid is 1:3, reflux at 60°C for 40min, wash with deionized water until neutral, and dry in an oven at 120°C to obtain the surface Functionalized carbon nanotube solids. The carbon nanotubes were added to the molten palmitic acid with a mass ratio of 1.0%, magnetically stirred for 10 minutes, and ultrasonically vibrated for 40 minutes to obtain a carbon nanotube / palmitic acid composite phase change material with a latent heat of phase change of 204.7 J / g. The phase transition temperature is 62.4°C, and its thermal conductivity at 25°C is 10.7% higher than that of palmitic acid.

Embodiment 2

[0015] Example 2: Mix multi-walled carbon nanotubes with concentrated acid, wherein the volume ratio of concentrated nitric acid to concentrated sulfuric acid is 1:3, reflux at 90°C for 40min, wash with deionized water until neutral, and dry in an oven at 120°C to obtain the surface Functionalized carbon nanotube solids. Add the carbon nanotubes to the molten palmitic acid at a mass ratio of 1.0%, magnetically stir for 120 minutes, and ultrasonically vibrate for 10 minutes to obtain a carbon nanotube / palmitic acid composite phase change material with a latent heat of phase change of 203.1 J / g. The phase transition temperature is 61.7°C, and its thermal conductivity at 25°C is 9.83% higher than that of palmitic acid.

Embodiment 3

[0016] Example 3: Mix multi-walled carbon nanotubes with concentrated acid, wherein the volume ratio of concentrated nitric acid to concentrated sulfuric acid is 1:3, reflux at 90°C for 20min, wash with deionized water until neutral, and dry in an oven at 120°C to obtain the surface Functionalized carbon nanotube solids. The mixture of carbon nanotubes and palmitic acid with a mass ratio of 1.0% was heated to melt, magnetically stirred for 20 minutes, and ultrasonically vibrated for 60 minutes to obtain a carbon nanotube / palmitic acid composite phase change material with a latent heat of phase change of 204.0 J / g , and its thermal conductivity at 25°C is 31.2% higher than that of palmitic acid.

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Abstract

The synthesis method of a composite phase-change heat-storage material containing carbon nanotube and having a matrix of palmitic acid comprises the following steps: mixing a carbon nanotube with a concentrated acid, reflowing at 60 to 110 DEG C for 20 to 40 min, cleaning by high-speed centrifugation to obtain neutral clear liquid, and drying in an oven at 120 DEG C to obtain the carbon nanotube with processed surface; and adding the carbon nanotube with processed surface into molten palmitic acid or heating the mixture of the carbon nanotube and the palmitic acid to a molten material, magnetically stirring the molten material for 10 to 120 min, and ultrasonically keeping the temperature for 10 to 100 min to obtain the uniform and stable carbon nanotube / palmitic acid composite phase-change heat-storage material with good stability. The carbon nanotube / palmitic acid composite phase-change heat-storage material can be widely used in civilian and military fields such as solar energy utilization, waste heat recovery, intelligent automatic air-conditioning buildings, glass greenhouses, phase-change energy-storage air-conditioners and heat preservation of appliances.

Description

technical field [0001] The invention relates to a phase change heat storage material with high stability and high thermal conductivity for a phase change energy storage system, in particular to a multi-walled carbon nanotube whose surface is hydroxylated and truncated into a moderate aspect ratio Synthesis of nanocomposite phase change thermal storage materials dispersed in parent palmitic acid. Background technique [0002] With the increasingly severe situation of the energy environment, it is urgent to make progress in the fields of high-efficiency energy, energy-saving technology, clean energy, and renewable and environmentally friendly energy. Phase change energy storage is an important technology to improve energy utilization efficiency and protect the environment, and an effective way to alleviate the mismatch between energy supply and demand in terms of time, intensity and location. Phase change material (PCM) is the core of phase change energy storage technology. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06C09C1/44C09C3/06
CPCY02P20/10
Inventor 谢华清王继芬陈立飞黎阳于伟
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY