Nano cellulose solid-solid phase transition material and its preparing method

A technology of nanocellulose and phase change material, applied in the preparation of the phase change material, in the field of nanocellulose solid-solid phase change material, can solve the complex preparation process of the phase change material, the small phase change enthalpy of the phase change material, and the Separation, liquid phase leakage and other problems, to avoid the phenomenon of homopolymerization, high phase change enthalpy, and improve the grafting rate.

Inactive Publication Date: 2005-12-21
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From a macroscopic point of view, crosslinking occurs between the energy storage groups and the skeleton material, but from a microscopic point of view, this phase change material is homopolymerized to a large extent, that is, a very large part of the skeleton material and the skeleton material Material cross-linking, energy storage groups and energy storage groups are cross-linked, which may cause phase s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 20 grams of polyethylene glycol with an average relative molecular mass of 6000 and dissolve it in 30 milliliters of dichloromethane to obtain a solution, measure 10 milliliters (about 11.138 g) of acryloyl chloride and dissolve it in 15 milliliters of dichloromethane to obtain a solution, And divide it into two parts equally, weigh 2 grams of nanocellulose and disperse it in dimethylformamide to obtain a suspension; add a few drops of pyridine catalyst (about 0.9 g) to the polyethylene glycol solution, and respectively Add the polyethylene glycol solution and nanocellulose suspension dropwise to the acryloyl chloride solution in batches, and stir slowly. After reacting for 6 hours, pour the above two reaction solutions together and mix them evenly. Add 1.6g of diphenylbenzene Ketone, then put the mixed solution into a UV generator (GE: LU400 / T / 40; 400W), irradiate with UV light for 1h, and finally dry the product to obtain the nanocellulose solid-solid phase chang...

Embodiment 2

[0028] Take by weighing 20 grams of polyethylene glycol monomethyl ether with an average relative molecular mass of 6000 and dissolve it in 60 milliliters of acetone to obtain a solution, weigh 2 grams of nanocellulose and make it dispersed in dimethylacetamide to obtain a suspension; The catalyst p-toluenesulfonic acid and the polymerization inhibitor benzoquinone are added to the polyethylene glycol monomethyl ether solution and the nanocellulose suspension, and the polyethylene glycol monomethyl ether solution and the nanocellulose suspension are respectively added at 80 to 100 ° C. Add about 2.3 milliliters (about 2.415 g) of excess acrylic acid dropwise, and after 10 hours of reaction, add the reaction liquid of polyethylene glycol monomethyl ether and acrylic acid into the reaction liquid of nanocellulose and acrylic acid and stir evenly, add 1.2 g of photosensitizer two Benzophenone, then put the mixed solution into an ultraviolet generator (GE: LU400 / T / 40; 400W), irradi...

Embodiment 3

[0030]Take by weighing 20 grams of polyethylene glycol with an average relative molecular mass of 4000 and dissolve it in 50 milliliters of toluene to obtain a solution, take by weighing 2 grams of nanocellulose and make it dispersed in dimethylformamide to obtain a suspension; Add 0.1 g of sodium to the solution and stir for 12 hours. After filtration, add 5 ml (about 5.569 g) of acryloyl chloride dropwise to the solution at 0°C to continue the reaction for 10 hours; 5 ml of acryloyl chloride was added dropwise to react for 6 hours; the reaction solution of polyethylene glycol and acryloyl chloride was poured into the reaction solution of nanocellulose and acryloyl chloride and stirred evenly, 1.6 g of photosensitizer benzophenone was added, and the mixed solution was put into Into the ultraviolet generator (GE: LU400 / T / 40; 400W), irradiated with ultraviolet light for 1h, the product is dried to obtain the nanocellulose solid-solid phase change material of the present inventio...

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Abstract

The invention relates to a kind of nano cellulose solid - solid phrase change material and its producing method. Its characteristics are: in non-homogeneous phase system, according to the reactants proportions as polyethylene glycol containing active group at one end or both ends 19.8% - 82.0%, crosslinking agent 0% - 55.1% and nanometer cellulose or its ramification 4.0% - 69.5%, ingraft the polyethylene glycol containing active group at one end or both ends as energy storing function group onto nanometer cellulose or its ramification framework material. The biggest enthalpy of phase change of the nanometer cellulose solid - solid phrase change material of the invention can get to over 110 J/g, the phrase change temperature is 0 - 60 Deg. C, and can keep good solid state before and after the phrase change. It won't occur phrase separation, besides it is non-toxic and harmless, low cost, simple producing technics.

Description

technical field [0001] The invention relates to a phase change material, in particular to a nano-cellulose solid-solid phase change material, and also to a preparation method of the phase change material. Background technique [0002] Phase change materials are currently widely used energy storage materials, and with the coming of the energy crisis, their applications in real life will be more extensive. According to the different phase change methods, phase change materials can be divided into solid-liquid phase change materials and solid-solid phase change materials. At present, the most commonly used phase change materials at home and abroad are solid-liquid phase change materials, but because of the liquid phase generated during the phase change process, it must be packaged in a container before use, otherwise the liquid phase will leak and corrode and pollute the environment. Danger. Moreover, the liquid material of solid-liquid phase change materials generally has di...

Claims

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Application Information

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IPC IPC(8): C09K5/02
Inventor 丁恩勇原小平
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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