Passive thermal management material and preparation method thereof

A thermal management and passive technology, applied in heat exchange materials, passive houses, chemical instruments and methods, etc., can solve the problems of clogging porous materials, leakage of phase change materials, difficult to stabilize temperature, etc., and achieve the effect of slowing down fluctuations and lasting hot compress. , the effect of stabilizing the temperature of the object for a long time

Pending Publication Date: 2022-05-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods may encounter problems such as clogging the pores of porous materials or leakage of phase change materials, and it is difficult to stabilize the temperature for a long time and effectively exert the good passive thermal management performance of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 200 g of paraffin wax (melting point of 40 ° C) was added to the beaker, heated to 60 ° C to make it completely melted, then 30 g of heat-expandable microspheres (produced by PolyChem Alloy, USA, model 180DU45) were added, stirred evenly, and cooled to room temperature to obtain a mixture. Take 20 g of the mixture and press it into a 1 mm sheet with a molding press. Then, the sheet was placed between the upper and lower plates of a molding machine with a temperature of 180°C and a spacing of 2 mm, heated and foamed for 2 min, taken out and placed between the cooling plates of the molding machine, and the spacing between the upper and lower plates was adjusted to 2 mm. After cooling, a passive thermal management material with a thickness of 2 mm, a flat surface and a foamed structure was prepared.

[0031] The above foamed sheet and control (unfoamed material, 2 mm) were placed on a hot stage at 50°C and the upper surface temperature was recorded. For the unfoamed sampl...

Embodiment 2

[0033] Others are the same as in Example 1. Add 200 g of paraffin wax (melting point of 40 ℃) into the beaker, heat it to 60 ℃ to make it completely melted, then add 80 g of heat-expandable microspheres, and finally prepare a passive thermal management sheet with a thickness of 2 mm and a foamed structure. material.

[0034] The prepared foam board is used to simulate the building insulation process: the board is bonded into a cubic box with a side length of 5cm to simulate the outer wall of the building. A small piece of ice was placed in the box on a 30°C hot stage. It takes 2000-2200s to find that all the ice cubes in the box have melted. If similar-sized ice cubes are placed directly on the above hot stage, it only takes 120-130s to completely melt.

Embodiment 3

[0036] Others are the same as in Example 2, first press the mixture into a 2 mm sheet with a molding machine, put it into a heating box at 180 ° C, place it for 5 min to foam, take it out, and immediately use a normal temperature molding machine to press into a thickness of about 5 mm, with a foaming structure. Passive thermal management sheet.

[0037] Similar to Example 2, when simulating the thermal insulation effect of a building, it was found that it took more than 3000 s for the ice cubes placed in the adhesive box with a thickness of 5 mm to melt completely.

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Abstract

The invention belongs to the technical field of new materials, and particularly relates to a passive thermal management material and a preparation method thereof. The phase change energy storage material with a foaming structure is prepared by forming micropores in the phase change energy storage material under the heating condition by using the foaming microspheres with the thermal expansion characteristic. According to the phase change energy storage material, on one hand, after the microspheres are expanded, a cavity structure is formed, the heat conductivity coefficient of the material is greatly reduced, and the material is endowed with good heat barrier performance; and on the other hand, the phase change energy storage material absorbs a large amount of heat in the phase change process, so that the total transferred heat is reduced. Due to the two characteristics, the material has an excellent passive heat management effect, the fluctuation of the temperature of a protection target is effectively reduced, and the material shows longer working time in heat insulation and heat preservation application.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a passive thermal management material with good thermal insulation performance and a preparation method thereof. Background technique [0002] With the vigorous development of green economy and technology, passive thermal management materials are playing an increasingly important role in thermal management systems. Passive thermal management materials can maintain a relatively stable temperature of the protected object on the basis of reducing active energy consumption, which makes them have broad application prospects in the field of thermal insulation. For example, passive houses, which are now emerging green energy buildings, use a large number of passive thermal management materials in the design of the exterior wall structure, which can maintain the indoor warm in winter and cool in summer while reducing active energy consumption such as air conditioning an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y02B30/90
Inventor 冯嘉春过新雨
Owner FUDAN UNIV
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