High molecular solid-to-solid phase transition energy storage material and preparation method thereof

A solid-solid phase change and polymer technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of leakage of polymer solid-solid phase change material phase change enthalpy, solid-liquid phase change material leakage, etc. To achieve the effect of simple preparation process, easy to use in large quantities, and low price

Inactive Publication Date: 2012-06-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of novel fatty acid (alcohol) with higher phase change enthalpy for the leakage of microcapsule coated phase change material existing in the current technology and the low problem of phase change enthalpy of polymer solid-solid phase change material. ) ester polymer-based solid-solid phase change phase change material, which not only solves the phase separation problem of inorganic and blended phase change materials, but also solves the flow and leakage problems of solid-liquid phase change materials

Method used

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  • High molecular solid-to-solid phase transition energy storage material and preparation method thereof
  • High molecular solid-to-solid phase transition energy storage material and preparation method thereof
  • High molecular solid-to-solid phase transition energy storage material and preparation method thereof

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Effect test

Embodiment 1

[0037] Add stearyl acrylate (SA) 16.23g (77.4%wt), methacrylic acid (MAA) 4.30g (20.5%wt) into the reactor equipped with condenser, dropping funnel, thermometer, and add 20mL toluene, The system was replaced with nitrogen, 4ml of 0.11g / ml BPO toluene solution (BPO 2%wt) was added dropwise, and the reaction was stopped after 10 hours at 55°C. The product was precipitated and washed with ethanol three times, and dried in an oven at 70°C for 5 hours. The samples were tested by differential scanning calorimeter (DSC) for phase transition enthalpy and phase transition temperature, and the data are listed in Table 1.

Embodiment 2

[0039] Add 6.49g (64.3%wt) of stearyl acrylate (SA) and 1.72g (17.0%wt) of methacrylic acid (MAA) into a reactor equipped with a condenser tube, dropping funnel, and thermometer, and add 10mL of toluene, The system was replaced with nitrogen, 4ml of 0.025g / ml BPO toluene solution (BPO 1%wt) was added dropwise, reacted at 70°C for 6h, and then 1.79g of N,N-dimethylethanolamine (DMEA) (17.7% wt), stirred at 25-30°C for 6h, the product was precipitated with ethanol and washed three times and dried. The samples were tested by differential scanning calorimeter (DSC) for phase transition enthalpy and phase transition temperature, and the data are listed in Table 1.

[0040] from figure 1 It can be seen that the heating and cooling curves have peaks at 51.23°C and 38.66°C, indicating that the phase change temperature and phase change enthalpy are reversible, that is, there are both melting peaks and crystallization peaks, and the phase change enthalpy of the phase change material H...

Embodiment 3

[0042] Add 15.62g of methacrylate-β hydroxyethyl ester and 28.45g of stearic acid (methacrylic acid-β hydroxyethyl stearate accounts for 85.0%wt) into a condenser tube, dropping funnel, thermometer, and water separator Add 0.53g of catalyst methanesulfonic acid and 40mL of toluene to the reactor, reflux and dehydrate at 110-140°C until the amount of dehydration is close to the theoretical value, then add 7.21g (14.5%wt) of acrylic acid, replace the system with nitrogen, drop Add 5ml of 0.05g / ml BPO toluene solution (BPO 0.5%wt), stop the reaction after reacting at 85°C for 5h, the product is washed three times with ethanol and dried in an oven at 70°C for 5h to obtain a polymer material with phase change function (The phase-change monomer accounts for 85.0%wt of the total monomer amount). The samples were tested by differential scanning calorimeter (DSC) for phase transition enthalpy and phase transition temperature, and the data are listed in Table 1.

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Abstract

The invention discloses a high molecular solid-to-solid phase transition energy storage material and a preparation method thereof. Fatty acid or fatty alcohol with phase transition performance is introduced into high-reaction active (methyl) crylic acid; an obtained polymerizable ester serves as a phase transition part; and a (methyl) acrylic ester polymer, a polymer of (methyl) acrylic ester-(methyl) acrylic acid and a quaternary ammonium salt of a (methyl) acrylate-(methyl) acrylic acid copolymer are prepared with a free radical copolymerization method. The phase transition temperature of the obtained high molecular solid-to-solid phase transition energy storage material is 29-52 DEG C, and the phase transition enthalpy can be up to 96 kJ/kg in maximum; and the material can keep in a solid state before and after phase transition, is free from small molecule leakage, is not required to be accommodated in a container, and is nontoxic and harmless.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a polymer solid-solid phase change energy storage material and a preparation method thereof. technical background: [0002] Due to the high energy storage density and constant temperature during the phase change, the phase change energy storage material has become a new and important energy-saving material, and has become a hot spot in the research of energy utilization at home and abroad. At present, the most researched phase change energy storage materials at home and abroad are solid-liquid phase change materials, but solid-liquid phase change materials become liquid during phase change, and there may be loss of phase change materials. In order to solve this problem, people use The technology of microcapsules effectively encapsulates phase change materials. Although the use of microencapsulation technology can solve the loss problem of phase change materials to a certain e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/06C08F8/32C08F222/14C09K5/02
Inventor 王家喜魏娜李云庆周宏勇
Owner HEBEI UNIV OF TECH
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