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Polyethylene glycol/hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material and preparation method thereof

A composite technology of hydroxypropyl cellulose and carbon nanotubes, used in heat exchange materials, chemical instruments and methods, etc., can solve problems such as liquid leakage and low thermal conductivity, and achieve improved thermal conductivity, green and clean environment, and synthetic routes. simple effect

Inactive Publication Date: 2020-02-18
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By providing a new curing agent to modify polyethylene glycol solid-liquid phase change materials, solve the current problems of liquid leakage and low thermal conductivity of polyethylene glycol in the phase change process

Method used

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  • Polyethylene glycol/hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material and preparation method thereof
  • Polyethylene glycol/hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material and preparation method thereof
  • Polyethylene glycol/hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A preparation method of polyethylene glycol / hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material comprises the following steps:

[0043] Step 1) Preparation of NCO-PEG prepolymer, add 8gPEG4000 and 1gMDI into MDF respectively to dissolve and configure a solution, and slowly add the PEG4000 solution into the MDI solution under the condition of passing inert gas, and keep the temperature at 85°C Stir the reaction in an oil bath, condense and reflux for 3 hours to obtain an NCO-PEG prepolymer.

[0044] Step 2) Preparation of cross-linked polymer, add 1.5560g hydroxypropyl cellulose to DMF and stir to dissolve, then add to NCO-PEG prepolymer, 85 ℃ constant temperature oil bath, stir reaction, condense and reflux for 7 hours, that is Obtain cross-linked polymer;

[0045] Step 3) Preparation of composite phase change materials, adding 0.1067g carbon nanotubes into DMF to disperse uniformly by ultrasonic, then adding to the prepared cross-linked...

Embodiment 2

[0057] A preparation method of polyethylene glycol / hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material (the content of polyethylene glycol is 60%, and the sample is named SSPCM-60%), steps not specified Same as Example 1, except that in the step 2, the content of hydroxypropyl cellulose is 4.2 g, and the mass of the carbon nanotubes added in the step 3 is 0.133 g.

[0058] In order to prove that the prepared SSPCM-60% phase change thermal performance is good, a differential scanning calorimetry (DSC) test was carried out, the test method was the same as in Example 1, and the phase change temperature and phase change enthalpy of SSPCM-60% were obtained Such as Figure 4 As shown, the phase transition temperature is 33.7-51.5 ℃, the phase transition enthalpy value is 99.7-101.2 J / g, and the phase transition enthalpy value is lower than that of SSPCM-75%.

[0059] In order to prove the anti-leakage effect of the present invention, a heating contra...

Embodiment 3

[0061] A preparation method of polyethylene glycol / hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material (the content of polyethylene glycol is 80%, and the sample is named SSPCM-80%), steps not specified Same as Example 1, except that: in the step 2, the content of hydroxypropyl cellulose is 0.9 g, and the mass of the carbon nanotubes added in the step 3 is 0.1 g.

[0062] In order to prove that the prepared SSPCM-80% phase change thermal performance is good, a differential scanning calorimetry (DSC) test was carried out, the test method was the same as in Example 1, and the phase change temperature and phase change enthalpy of SSPCM-80% were obtained Such as Figure 4 As shown, the phase change temperature of the phase change material is 35.6-51.7 ℃, the phase change enthalpy value is 131.1-134.6 J / g, and the phase change enthalpy value is increased relative to the enthalpy value of SSPCM-75%.

[0063] In order to prove the anti-leakage effect ...

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Abstract

The invention discloses a polyethylene glycol / hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material. The phase change material is prepared from polyethylene glycol (PEG),isocyanate (MDI) and hydroxypropyl cellulose (HPC) through a chemical grafting reaction. The phase change material is subjected to phase change at 80-120 DEG C, and after the temperature is kept for1-2 h, the stable solid state is still kept, and small molecule leakage is avoided; and the phase change process of the phase change material is solid-solid phase change, the phase change temperatureis 32-54 DEG C, the phase change enthalpy value is 99.5-130.8 J / g, and the thermal conductivity is 0.2494-0.5239 W / m. A preparation method of the phase change material comprises the following steps: (1) preparing an NCO-PEG prepolymer; 2) preparing a cross-linked polymer; and 3) preparing the composite phase change material. The preparation method has the following advantages: 1, the problem of leakage in the phase change process is solved; 2, the synthetic route is simple and has no pollution; 3, the phase change mateirla has good thermal energy storage characteristic and good thermal stability; and 4, the thermal conductivity of the phase change material is effectively improved, and the thermal conductivity is increased from 0.2494 W / m.K to 0.5239 W / m.K, and the utilization rate of heatis improved.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage materials, in particular to a polyethylene glycol / hydroxypropyl cellulose carbon nanotube composite solid-solid phase change material and a preparation method thereof. Background technique [0002] In recent years, with the development of the economy, the problem of environmental pollution has gradually increased, and the energy crisis has become increasingly prominent. It is imminent to find efficient and environmentally friendly energy storage devices. As a kind of high-efficiency thermal energy storage, phase change materials can absorb the heat of the environment during the transformation of their physical state or molecular structure, and release heat to the environment when needed, so as to achieve the purpose of controlling the temperature of the surrounding environment. It has been used in solar energy utilization, waste heat recovery, intelligent air-conditioning build...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08K3/04C08G18/76C08G18/48C08G18/64C09K5/02
CPCC08G18/4833C08G18/6484C08G18/7671C08K2201/011C08L2201/08C09K5/02C08K3/041C08L75/08
Inventor 徐芬尹庆庆孙立贤陈冬梅王涛吴怡张焕芝魏胜赵莉
Owner GUILIN UNIV OF ELECTRONIC TECH
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