Super-critical water degraded polyester gradient phase change heat storage material and preparation method thereof

A phase change heat storage material and polyester degradation technology, applied in the field of phase change materials and their heat storage, can solve the problems of changing the phase change point, reducing the proportion of sensible heat, low efficiency, etc., to improve thermal conductivity, good Compatibility, effect of reducing insulation cracks

Active Publication Date: 2019-06-28
WUHAN XINBOMING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The sunlight intensity of solar energy is different in different seasons, different regions, and different hours, and the temperature generated by solar heat storage materials is also different. If a single phase change material is used to absorb heat, it is difficult to achieve the same temperature value in each period. It can be as close as possible to the phase change point, so that it is difficult for phase change materials to work at the phase change point, and more often the heat storage has to be done in a low-efficiency sensible heat method. If the composite phase change material is a composite phase change material, each phase change component can be as close as possible to the phase change working state, minimize the proportion of sensible heat, and store heat with the highest efficiency. At present, such technical methods at home and abroad are relatively rare
[0004] Chinese patent CN106221676A discloses a "phase-change heat storage material with multiple phase-change points and its preparation process", the principle of which is to mix a variety of phase-change materials with different phase-change points to form a heat storage material with multiple phase-change temperatures Hierarchical phase-change materials; Chinese patent CN106634856A discloses

Method used

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  • Super-critical water degraded polyester gradient phase change heat storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Put 100kg of polyester into the reaction kettle, add 50kg of water to the reaction kettle, the temperature is 400°C, seal and heat for 30 minutes, remove water and dry to obtain a low molecular weight polyester with a molecular weight of 1200 and a melting point of 61°C.

[0039] Put 100kg of polyester into the reaction kettle, add 40kg of water to the reaction kettle, the temperature is 385°C, seal and heat for 20 minutes, remove water and dry to obtain a low molecular weight polyester with a molecular weight of 2500 and a melting point of 77°C.

[0040] Add 100kg of polylactic acid into the reactor, add 30kg of water to the reactor, set the temperature at 375°C, seal and heat for 10 minutes, remove the water and dry to obtain a low molecular weight polyester with a molecular weight of 5500 and a melting point of 86°C.

[0041] The low-molecular-weight polyesters with the above three melting points are used in equal proportions to form a gradient phase-change heat stora...

Embodiment 2

[0045] Put 100kg of polyester into the reaction kettle, add 50kg of water to the reaction kettle, the temperature is 400°C, seal and heat for 30 minutes, remove water and dry to obtain a low molecular weight polyester with a molecular weight of 1200 and a melting point of 61°C.

[0046] Put 100kg of polyester into the reaction kettle, add 40kg of water to the reaction kettle, the temperature is 385°C, seal and heat for 20 minutes, remove water and dry to obtain a low molecular weight polyester with a molecular weight of 2500 and a melting point of 77°C.

[0047] Add 100kg of polylactic acid into the reactor, add 30kg of water to the reactor, set the temperature at 375°C, seal and heat for 10 minutes, remove the water and dry to obtain a low molecular weight polyester with a molecular weight of 5500 and a melting point of 86°C.

[0048] The above three kinds of low-molecular-weight polyesters with melting points are used in equal proportions to form a gradient phase-change heat ...

Embodiment 3

[0052] Put 100kg of polyester into the reaction kettle, add 50kg of water to the reaction kettle, the temperature is 400°C, seal and heat for 30 minutes, remove water and dry to obtain a low molecular weight polyester with a molecular weight of 1200 and a melting point of 61°C.

[0053] Put 100kg of polyester into the reaction kettle, add 40kg of water to the reaction kettle, the temperature is 385°C, seal and heat for 20 minutes, remove water and dry to obtain a low molecular weight polyester with a molecular weight of 2500 and a melting point of 77°C.

[0054] Put 100kg of polyester into the reaction kettle, add 30kg of water to the reaction kettle, the temperature is 375°C, seal and heat for 10 minutes, remove water and dry to obtain a low molecular weight polyester with a molecular weight of 5500 and a melting point of 86°C.

[0055] The above three low molecular weight polyesters with melting points are composed of gradient phase change heat storage materials in a ratio of...

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Abstract

The invention relates to the technical field of phase change materials and heat storage thereof, in particular to a super-critical water degraded polyester gradient phase change heat storage materialand a preparation method thereof. Polyester is degraded in multistage by adopting a super-critical water method to obtain low molecular weight polyester with various molecular weights or melting points so as to construct the gradient phase change heat storage material. The phase change heat storage material has a plurality of solid-liquid phase change points.

Description

technical field [0001] The invention relates to a gradient phase change heat storage material and a preparation method thereof. Specifically, two or more phase change materials with different solid-liquid phase transition points are used to form a composite phase change material with multiple phase change points, which belongs to phase change materials and Its thermal storage technology field. Background technique [0002] Phase change heat storage uses the heat absorption and release of materials at the melting point to achieve isothermal heat storage, which is more efficient than sensible heat storage. [0003] The sunlight intensity of solar energy is different in different seasons, different regions, and different hours, and the temperature generated by solar heat storage materials is also different. If a single phase change material is used to absorb heat, it is difficult to achieve the same temperature value in each period. It can be as close as possible to the phase ...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08K7/24C08K5/134C09K5/06
Inventor 孙义明胡晓利王军
Owner WUHAN XINBOMING TECH DEV
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