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Boron nitride/cellulose encapsulated thermal-conductivity-enhanced formalized phase-change material

A technology of shape-setting phase change materials and phase change materials, which is applied in the field of heat conduction-enhanced shape-setting phase change materials, can solve the problems of low thermal conductivity and low enthalpy of phase change materials, and achieve high thermal conductivity, efficient heat conduction structure, The effect of good physical and mechanical properties

Inactive Publication Date: 2020-02-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a boron nitride / cellulose-encapsulated thermal conduction-enhanced shape-changing material to overcome the defects of low enthalpy and low thermal conductivity of phase-change materials in the prior art.

Method used

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  • Boron nitride/cellulose encapsulated thermal-conductivity-enhanced formalized phase-change material
  • Boron nitride/cellulose encapsulated thermal-conductivity-enhanced formalized phase-change material
  • Boron nitride/cellulose encapsulated thermal-conductivity-enhanced formalized phase-change material

Examples

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Embodiment 1

[0038] (1) Get 10.0g solid content and be the suspension of the cellulose nanowire / water of 1.8wt%, add 3-(2,3-epoxypropoxy)propyltrimethoxysilane (0.18g), polyethylene Amine (0.18 g) was stirred at room temperature for 2 h to obtain polyethyleneimine-modified cellulose nanowire suspension. The suspension was quickly frozen in a -80°C ultra-low temperature refrigerator for 1 hour, then freeze-dried in a freeze dryer for 36 hours at a temperature of -54°C and a pressure of 30 Pa, and then baked in an oven at 110°C for 30 minutes , the silane is hydrolyzed and cross-linked and solidified to obtain polyethyleneimine cross-linked reinforced cellulose porous material.

[0039] (2) Flowing 500mL of boron nitride nanosheet water / isopropanol (1:1) mixed solvent suspension with a concentration of 0.05wt% through the cellulose porous material in step (1), washing with water and freeze-drying to obtain cellulose / boron nitride composite porous material.

[0040] (3) After heating and ...

Embodiment 2

[0045] According to Example 1, the amount of polyethyleneimine in Step (1) of Example 1 is changed to 0.09g, polyethylene glycol (PEG6000) in step (3) is changed to Polyethylene Glycol (PEG10000), and all the other are the same as those in the implementation The same as in Example 1, a cellulose / boron nitride-stabilized heat conduction-enhanced shaped polyethylene glycol phase change material was obtained. Wherein the loading rate of polyethylene glycol is 96.0wt%, the melting enthalpy is 175.4J / g, and the melting temperature is 59.5°C.

Embodiment 3

[0047] According to Example 1, except that the suspension in step (1) is placed in liquid nitrogen (-196° C.) for quick freezing, and the freezing time is 20 minutes, the rest are the same as Example 1 to obtain cellulose / boron nitride stable heat Conductivity enhanced polyethylene glycol shape-changing materials. Wherein the loading ratio of polyethylene glycol is 94.4wt%, the melting enthalpy is 168.1J / g, and the melting temperature is 56.6°C.

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Abstract

The invention relates to a boron nitride / cellulose encapsulated thermal-conductivity-enhanced formalized phase-change material. The material is prepared by enabling a boron nitride nanosheet suspension to flow through a cellulose porous material, performing freeze-drying, and by impregnating a phase-change material into the obtained cellulose / boron nitride porous material in a vacuum impregnationmode. The material has the characteristics of high enthalpy value, high thermal conductivity, solid state maintenance above a melting point, no flow and no leakage, and has broad application prospectsin fields of temperature management, building thermal insulation, thermal energy storage and temperature-regulating textiles.

Description

technical field [0001] The invention belongs to the field of phase-change energy storage materials, in particular to a boron nitride / cellulose-encapsulated thermal conduction-enhanced shape-setting phase-change material. Background technique [0002] In recent years, phase change energy storage materials have been more and more widely used in thermal energy management, temperature control system, building insulation, temperature control textiles, temperature control of electronic devices and other fields. Common phase change materials can be divided into solid-solid phase change, solid-liquid phase change, solid-gas phase change, and liquid-gas phase change according to the phase change state. Among them, solid-liquid phase change materials have the advantages of strong heat storage capacity and small volume change, and are currently the most widely used phase change materials. However, the leakage problem after liquefaction and the inherent low thermal conductivity of soli...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 王碧佳杨国庆隋晓锋冯雪凌毛志平徐红钟毅
Owner DONGHUA UNIV
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