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Phase change energy storage material and preparation method thereof

A phase-change energy storage material and ionic liquid technology, applied in the field of phase-change energy storage materials and their preparation, can solve the problems of unfavorable environment and health, high production costs, etc., and achieve the effect of abundant resources

Inactive Publication Date: 2009-09-02
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The framework materials used in the above patents are all cellulose derivatives, the production cost is relatively high, and they are all prepared in organic solvents, which is harmful to the environment and health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, preparation phase change energy storage material

[0017] Polyethylene glycol monomethyl ether (molecular weight is 5000) 8g and toluene diisocyanate 0.3g are respectively dissolved in dimethylformamide, then the polyethylene glycol monomethyl ether solution is added in batches (average divided into ten parts) isocyanate solution while stirring. React at 60°C for 6 hours to obtain a polyethylene glycol monomethyl ether prepolymer.

[0018] 0.2g microcrystalline cellulose (purchasing factory is Beijing Fengli Jingqiu Trading Co., Ltd., the degree of polymerization DP of this cellulose is 220) is dissolved in 10g 1-allyl, 3-methyl imidazolium chloride ionic liquid ( AMIMCl), stirring and dissolving at 80°C, then adding the above-mentioned polyethylene glycol monomethyl ether prepolymer in batches, and continuing to react at 70°C for 6h, after the reaction was completed, dialyzed in water, and freeze-dried.

[0019] The obtained material is a solid-solid ph...

Embodiment 2

[0020] Embodiment 2, preparation phase change energy storage material

[0021] Polyethylene glycol monomethyl ether (molecular weight is 2000) 8g and 4,4-diphenylmethane diisocyanate 1.0g are dissolved in dimethylformamide respectively, then polyethylene glycol monomethyl ether solution is batched ( Evenly divided into ten parts) was added to the isocyanate solution while stirring. React at 60°C for 5 hours to obtain polyethylene glycol monomethyl ether prepolymer.

[0022] Dissolve 0.4g of nanocellulose in 20g of 1-ethyl, 3-methylimidazolium acetate ionic liquid (EMIMAC), stir and dissolve at 80°C, and then add the above-mentioned polyethylene glycol monomethyl ether prepolymer in batches, 70 Continue to react at ℃ for 5h. After the reaction is completed, dialyze in water and freeze-dry. Wherein, the nanocellulose is obtained according to the preparation method of the patent No. 00117261.1 and the title of the invention is "a nanocrystalline cellulose and its preparation me...

Embodiment 3

[0024] Embodiment 3, preparation phase change energy storage material

[0025] Polyethylene glycol monomethyl ether (molecular weight is 1100) 8g and 4,4-diphenylmethane diisocyanate 1.8g are dissolved in dimethylformamide respectively, then polyethylene glycol monomethyl ether solution is batched ( Evenly divided into ten parts) was added to the isocyanate solution while stirring. React at 60°C for 4 hours to obtain polyethylene glycol monomethyl ether prepolymer.

[0026] After tearing up 0.5g pulp cellulose (purchased from Baoding Swan Chemical Fiber Group Co., Ltd., the degree of polymerization DP of the cellulose is 650), soak it in 75ml NaOH aqueous solution (20%) for 2h, wash it with ethanol three times, vacuum Dry and ready to use. Weigh 5g of 1-butyl, 3-methylimidazolium acetate ionic liquid (BMIMAC), add 0.2g of activated cellulose, and stir at 80°C to dissolve gradually. Then add the above-mentioned polyethylene glycol monomethyl ether prepolymer in batches, cont...

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Abstract

The invention discloses a phase change energy storage material and a preparation method thereof. The method comprises the following steps: 1) polyethylene glycol reacts with a crosslinking agent at the temperature of 50 DEG C to 80 DEG C for 4 hours to 8 hours and a polyethylene glycol prepolymer is obtained; and 2) the polyethylene glycol prepolymer and a cellulose ionic liquid solution react at the temperature of 60 DEG C to 80 DEG C for 4 hours to 8 hours. The mass portions of polyethylene glycol are 50 to 95 and the mass portions of the crosslinking agent are 1 to 20. The mass portions of cellulose are 2 to 40 and the concentration of the cellulose ionic liquid solution is 2 percent to 5 percent by mass percentage. The material realizes the storage and release of energy through reversible solid-solid phase conversion, the phase change temperature is at 25 DEG C to 60 DEG C, enthalpy of phase change can be up to 150 J / g, and the material is non-toxic or harmless and has high energy storage density, good thermal stabilization, no liquid leakage and phase separation, simple preparation technique and excellent application prospect in the fields of energy storage and temperature control.

Description

technical field [0001] The invention relates to a phase change energy storage material and a preparation method thereof, in particular to a phase change energy storage material prepared in ionic liquid. Background technique [0002] Phase change energy storage is a latent heat energy storage method, which uses the thermal effect of materials during the phase transition process to store and release energy, and has the advantages of high energy storage density and constant temperature. It has a wide range of applications in the fields of solar energy utilization, building materials, textiles and aviation. Traditional phase change energy storage materials mainly include inorganic crystalline hydrated salts and molten salts, as well as organic compounds, such as higher aliphatic hydrocarbons (paraffin), higher fatty acids, alcohols and their mixtures. These materials mainly store and release energy in the form of solid-liquid phase transition, and there are supercooling and pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C08G65/48C08G81/00C08K5/29
Inventor 黄勇李艳香
Owner INST OF CHEM CHINESE ACAD OF SCI
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