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A kind of polyurethane phase change material containing functionalized graphene regulating polyethylene glycol and preparation method thereof

A technology of polyethylene glycol and phase change materials, which is applied in the field of phase change energy storage, can solve the problems of phase separation and affect the long-term performance of phase change materials, and achieve improved thermal stability, thermal conductivity, and flame retardancy Effect

Inactive Publication Date: 2019-07-12
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no chemical bond between graphene and organic polyurethane polyethylene glycol, and the phase separation between inorganic graphene and phase change material polyethylene glycol is easy to occur during the phase change process, which affects the long-term performance of phase change materials.
Therefore, through the functional modification of graphene oxide, the polyethylene glycol phase change material is chemically bonded to the functionalized graphene support skeleton structure through chemical bonds. The graphene skeleton structure introduces organic flame retardant molecules, and at the same time gives the graphene surface functional , achieved the purpose of functionalized flame retardancy and improved thermal stability. Graphene itself has high thermal conductivity. At present, there are few reports on the polymerization of functionalized graphene and phase-change working material polyethylene glycol by chemical methods.

Method used

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  • A kind of polyurethane phase change material containing functionalized graphene regulating polyethylene glycol and preparation method thereof
  • A kind of polyurethane phase change material containing functionalized graphene regulating polyethylene glycol and preparation method thereof
  • A kind of polyurethane phase change material containing functionalized graphene regulating polyethylene glycol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 1.20g of graphene oxide GO and place it in a 250ml three-neck flask, add 1ml of N,N-dimethylformamide (DMF) into it, start stirring slowly, and slowly add 80ml of it to the above system with a constant pressure dropping funnel Thionyl chloride (SOCl 2 ), and then heated to 70°C for 24 hours to obtain the reaction product Intermediate I (about 0.65 g) after vacuum drying.

[0032]Weigh 4.62g of CAC and place it in a 250ml flask under ice bath conditions, slowly add 50ml of refrigerated acetone and 50ml of deionized water in turn, form a uniform suspension after magnetic stirring, and keep at 0°C during this process. Then slowly add 100ml of ammonia water with a concentration of 1mol / L to the above suspension with the help of a dropping funnel, and keep it at 0~5°C for 30min. After filtering, washing with water and drying at 50°C, the product ADCT, namely intermediate II, was obtained.

[0033] Intermediate I and Intermediate II were heated to 85° C. and stirred f...

Embodiment 2

[0037] Add polyethylene glycol 4000 (27.00g) to step V in Example 1 and dissolve in the fully purified DMF solvent, add MDI in a molar ratio (2:1), keep at 70-80°C under the protection of nitrogen Next, add 0.1-0.5% of dibutyltin dilaurate (T-12, DBTDL) to the amount of catalyst PEG solid powder, and react for 4-6h. Other steps are the same as in Example 1.

[0038] The phase change enthalpy of the phase change material is 119.6J / g, the enthalpy change efficiency is 68.73%, the heat release rate is reduced by 42.7%, the ignition time of the material is delayed by 51S, and the thermal conductivity is increased by 322%.

Embodiment 3

[0040] Add polyethylene glycol 10000 (66.67g) to step V in Example 1 and dissolve it in the fully purified DMF solvent, add MDI in a molar ratio (2:1), keep it at 70-80°C under the protection of nitrogen Next, add 0.1-0.5% of dibutyltin dilaurate (T-12, DBTDL) to the amount of catalyst PEG solid powder, and react for 4-6h. Other steps are the same as in Example 1.

[0041] The phase change enthalpy of the phase change material is 133.7J / g, the enthalpy change efficiency is 82.33%, the heat release rate is reduced by 27.8%, the ignition time of the material is delayed by 27S, and the thermal conductivity is increased by 237%.

[0042] In the above examples, only the molecular weight of polyethylene glycol is different. The test results show that its energy storage density, thermal stability and thermal conductivity of the composite phase change material through the regulation and control of molecular weight are all improved compared with pure polyethylene glycol, and it can be ...

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Abstract

The invention discloses a polyurethane phase-change material containing polyethylene glycol (PEG) regulated by functionalized graphene and a preparation method of the polyurethane phase-change material. The polyurethane phase-change material adopts the structure as shown in the description. The composite phase-change material has nitrogen-series organic flame-retardant molecules, graphite oxide, cyanuric chloride, a diphenyl-methane-diisocyanate compound and PEG are taken as raw materials, and a polymerization method is utilized to prepare the polyurethane phase-change material containing polyethylene glycol regulated by functionalized graphene. According to the polyurethane phase-change material, PEG can realize leakage resistance, high thermal conductivity and excellent thermal stability in the same framework material, and the addition of PEG with controllable molecular weight is changeable; and the phase-change material with controllable phase-change temperature and enthalpy change is prepared.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage, and relates to a polyurethane phase change material which utilizes functionalized graphene to regulate polyethylene glycol and a preparation method thereof. Background technique [0002] The development of new energy has made a great contribution to the sustainable development of human progress and environmental protection. Energy is the heart of industrial development. With the development of industry, common fossil fuels are decreasing day by day. The development of new energy has become the epitome of the development of all countries. At present, energy development has made significant progress in solar energy, nuclear energy, wind energy, geothermal energy, etc., but fossil fuels still dominate, which has led to increasingly severe environmental problems. In recent years, my country's smog pollution has been serious, causing various respiratory diseases and even death; lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/10C08K9/00C08K3/04C09K5/06
CPCC08G18/10C08G18/3851C08G18/4833C08G18/6685C08K3/04C08K9/00C09K5/063
Inventor 张平王峰康明张丽
Owner SOUTHWEAT UNIV OF SCI & TECH
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