Method for preparing low-temperature phase-change material from tetradecane and expandable graphite

A technology of expanded graphite and low-temperature phase change, which is applied in chemical instruments and methods, heat exchange materials, and other chemical processes. It can solve problems such as high cost and complex process of low-temperature phase change materials, and achieve low cost and ensure stable adsorption. Sex, the effect of long exothermic time

Inactive Publication Date: 2020-08-18
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for making low-temperature phase-change materials using tetradecane and expa

Method used

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  • Method for preparing low-temperature phase-change material from tetradecane and expandable graphite
  • Method for preparing low-temperature phase-change material from tetradecane and expandable graphite
  • Method for preparing low-temperature phase-change material from tetradecane and expandable graphite

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preparation example Construction

[0027] A method for preparing a low-temperature phase change material based on tetradecane / expanded graphite proposed by the present invention, the expandable graphite is placed in an oven and dried for several hours, then taken out and spread in a crucible, and the crucible is placed in a muffle furnace Calcinate for a period of time, take it out and cool it, and then prepare expanded graphite with complete expansion; the melting point of tetradecane used is 5.5°C, mix tetradecane / expanded graphite in a certain ratio, stir at a certain temperature and a certain pressure range, Make the two materials fully contact, absorb completely, mix evenly, pour the mixture into the funnel, connect the vacuum pump and carry out suction filtration until there is no liquid dripping from the bottom of the funnel, rinse the beaker with the filtrate repeatedly and suction filtration until there is no expanded graphite residue in the beaker. Put the solid obtained by suction filtration into an o...

Embodiment 1

[0035] (1) Put the expanded graphite in an oven at 100°C for 2 hours and fully dry it.

[0036] (2) Weigh 10 g of fully dried expanded graphite and add it to a beaker, pour the phase change main material into it to completely submerge the expanded graphite. Place the beaker in a 60°C water bath, stir with a constant speed stirrer at a speed of 160 rad / min for 30 minutes, during which the expanded graphite that sticks to the wall of the beaker should be scraped off to ensure full contact and complete adsorption of the material.

[0037] (3) Pour the homogeneous mixture that has been stirred into a funnel, connect a vacuum pump and carry out suction filtration until no liquid drips down at the bottom of the funnel, repeatedly rinse the beaker with the filtrate and perform suction filtration until there is no expanded graphite residue in the beaker.

[0038] (4) Put the solid obtained by suction filtration into an oven at 80° C. for blast drying, take it out and weigh it every ha...

example 2

[0047] Example 2: Same as Example 1, but the temperature of the water bath in step (2) is changed to 30°C.

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Abstract

The invention belongs to the technical field of phase change material preparation, and discloses a method for preparing a low-temperature phase-change material from tetradecane and expanded graphite.The method comprises the following steps: (1) placing expandable graphite in an oven, drying the expandable graphite at 100 DEG C for 2 hours, taking out the expandable graphite, laying the expandablegraphite in a crucible, calcining the crucible, taking out the crucible, and cooling the crucible to obtain expanded graphite, which is completely expanded; (2) weighing expanded graphite, adding theexpanded graphite into a beaker, pouring tetradecane into the beaker, placing the beaker in a water bath kettle, and stirring; (3) carrying out suction filtration on the stirred uniform mixture; and(4) putting the solid obtained by suction filtration into a drying oven for drying, taking out and weighing every half an hour, and observing the surface drying state of the solid until the material mass loss rate is reduced and the sample is loose and granular to obtain the low-temperature phase-change material. The method is mainly used for preparing the low-temperature phase-change material which is widely used in an anti-freezing cement concrete pavement, and solves the problems of complex process and high cost of a conventional low-temperature phase-change material preparation method.

Description

technical field [0001] The invention belongs to the technical field of phase-change material preparation, and specifically discloses a method for producing low-temperature phase-change materials by utilizing tetradecane and expanded graphite. Background technique [0002] my country has a vast land area, with large spans from north to south and east to west. Most of the territory is in ice and snow areas, and the problem of snow and ice on roads is relatively common. In the early winter and early spring seasons in ice and snow areas and in winter in some central areas, day and night alternately cool and warm, under the action of temperature, humidity and vehicle load, it will cause ice condensation on the surface of buildings or cement concrete roads, seriously affecting the durability of buildings and road safety. sex etc. If the composite phase change material is applied to the cement concrete pavement, it can prevent the pavement from icing, effectively solve the traffic...

Claims

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Application Information

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IPC IPC(8): C09K5/06C09K3/18
CPCC09K3/185C09K5/063
Inventor 朱洪洲王大谦陈建兵陈瑞璞苟珊胡蓝心
Owner CHONGQING JIAOTONG UNIVERSITY
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