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Novel phase change system of long-chain hydrocarbon and long-chain alkyl polymer

A long-chain hydrocarbon and polymer technology, which is applied in the field of new phase change systems for long-chain hydrocarbons and long-chain hydrocarbon-based polymers, can solve the problems of limited use range and low heat resistance temperature, and achieve high safety and good thermal stability. , Controllable effect

Pending Publication Date: 2022-04-12
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, common organic phase change materials include polymeric phase change materials and long-chain aliphatic hydrocarbons, higher fatty alcohols, higher fatty acids or higher fatty esters. Due to the different melting temperatures of the above phase change materials, they can only meet the use requirements of some occasions; In view of its low heat resistance temperature, the scope of use is also limited
In addition, most studies on phase change materials focus on using the absorption or release of latent heat of phase change to keep the temperature of the material itself constant; there are few examples of large temperature changes in phase change systems caused by the phase change process of the material itself

Method used

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  • Novel phase change system of long-chain hydrocarbon and long-chain alkyl polymer

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Experimental program
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Effect test

Embodiment 1

[0027] The container volume of the phase change system is 100mL, the phase change material is eicosane, the volume of the phase change material accounts for 1 / 8 of the volume of the phase change system, the phase builder is nitrogen, the initial pressure of nitrogen is 1MPa, and the original heating rate is 15 °C / min, the set temperature is 230 °C. When the temperature of the phase change system rises to 230 °C, the external heat supply is stopped, and the phase change material is heated to a peak temperature of 310 °C at a heating rate of about 120 °C / min due to the heat released by the phase change inside the phase change material.

Embodiment 2

[0036] The volume of the phase change system container is 100mL, the phase change material is octadecane, the volume of the phase change material accounts for 1 / 9 of the volume of the phase change system, the upper atmosphere pressure is provided by nitrogen, the initial pressure of nitrogen is 1MPa, and the original heating rate is 15°C / min, the set temperature is 250°C. When the temperature of the phase change system rises to 250 °C, the external heat supply is stopped, and the phase change material is heated to a peak temperature of 340 °C at a heating rate of about 150 °C / min due to the heat released by the phase change inside the phase change material.

Embodiment 3

[0038] The volume of the phase change system container is 100mL, the phase change material is polyethylene, the volume of the phase change material accounts for 1 / 7 of the volume of the phase change system, the upper atmosphere pressure is provided by nitrogen, the initial pressure of nitrogen is 1MPa, and the original heating rate is 15°C / min, the set temperature is 340°C. When the temperature of the phase change system rises to 340°C, the external heat supply is stopped, and the phase change material is heated to a peak temperature of 410°C at a heating rate of about 110°C / min due to the heat released by the phase change inside the phase change material. The depolymerization reaction of ethylene occurs at this temperature, and the same degree of self-exothermic phenomenon does not exist in the second heating process.

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Abstract

The invention discloses a novel long-chain hydrocarbon and long-chain alkyl polymer phase change system. The novel long-chain hydrocarbon and long-chain hydrocarbon polymer phase change system is composed of a phase change material and a phase building agent, the phase change material is a long-chain hydrocarbon polymer or long-chain hydrocarbon, the phase building agent is nitrogen, inert gas or liquid with the boiling point lower than 90 DEG C, and the volume of the phase change material accounts for 1 / 50-1 / 7 of the volume of the phase change system. The original heating rate of the phase change system is greater than 10 DEG C / min, and the initial pressure in the phase change system is 0.5-4 MPa. The novel long-chain hydrocarbon and long-chain alkyl polymer phase change system provided by the invention realizes a violent self-heat-release effect based on liquid-liquid phase change in a high-pressure atmosphere and a relatively high temperature interval, and discovery of the effect has important significance on long-chain molecule phase change research and has potential application value in many fields.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a novel phase change system of long-chain hydrocarbons and long-chain hydrocarbon-based polymers. Background technique [0002] Phase-change materials are a class of substances that can absorb or release heat through changes in their own structure to achieve energy storage. With the development of industrial civilization, thermal systems driven by phase change materials have important applications in thermal energy storage and thermal management systems. Organic phase change materials have the advantages of good chemical stability, thermal stability and non-corrosion, and have great application potential in buildings, solar energy and waste heat recovery and utilization. [0003] At present, common organic phase change materials include polymeric phase change materials and long-chain aliphatic hydrocarbons, higher fatty alcohols, higher fatty acids or higher fatty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/04
Inventor 袁浩然程磊磊王亚琢顾菁陈勇
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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