High molecular solid/solid phase changing material with net type and comb type mixed structure and its preparing method

A solid-solid phase change material and hybrid structure technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of decreased mechanical strength, poor processing performance, and the use temperature cannot be too high, and achieve long service life and cost. The effect of low, suitable phase transition temperature

Inactive Publication Date: 2005-05-18
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

Among them, the net-shaped solid-solid phase change material has excellent physical properties such as good mechanical properties, aging resistance, and solvent resistance. The disadvantage is that the processing performance is slightly poor when made into large objects; and the comb-shaped solid-solid phase change material is quite excellent in processing performance. , but the use temperature should not be too high, otherwise the mechanical strength will decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 22.8 grams of polyethylene glycol with an average molecular mass of 6,000 and 1.2 grams of polyethylene glycol monomethyl ether with an average molecular mass of 6,000 and dissolve them in 60 mL of toluene, heat under nitrogen protection, and control the temperature at 100-120°C , to obtain solution A. 0.18 g of sodium metal was added to solution A, and solution C was obtained after 20 hours of reaction. Weigh 0.43 g of chlorinated polypropylene, add 30 mL of toluene, and heat under the protection of nitrogen at an optimum temperature of 80-100° C. to obtain solution B. Evenly add solution C to solution B dropwise, fully react for 10 hours, volatilize the toluene therein, wash and thoroughly dry, and obtain the solid-solid phase change material of the present invention. After testing, the phase change enthalpy of the phase change material is 114.2J / g, and the phase change temperature is 56.76°C. In the reactant, by mass fraction: two polyethylene glycols are 97....

Embodiment 2

[0028] Weigh 10 grams of polyethylene glycol with an average molecular weight of 10,000 and 10 grams of polyethylene glycol monomethyl ether with an average molecular weight of 5,000 and dissolve them in 40 mL of xylene, heat under nitrogen protection, and control the temperature at 150-170 °C, solution A was obtained. 0.10 g of sodium metal was added to solution A, and solution C was obtained after 24 hours of reaction. Add 30 mL of xylene to 0.54 g of chlorinated polypropylene, heat under nitrogen protection, and control the temperature between 80 and 100° C. to obtain solution B. The solution C is evenly added dropwise into the solution B, and after fully reacting for 12 hours, the xylene in it is volatilized, washed and thoroughly dried to obtain the solid-solid phase change material of the present invention. The phase transition enthalpy of the material is 89.05 J / g, and the phase transition temperature is 52.86 °C. In the reactants by mass fraction: the two polyethylen...

Embodiment 3

[0030]Weigh 20 grams of polyethylene glycol with an average molecular weight of 4000 and 10 grams of polyethylene glycol monomethyl ether with an average molecular weight of 4000, dissolve them in 40 mL of toluene, heat under nitrogen protection, and control the temperature at 60-80 ° C. Solution A is obtained. Add 0.49 g of potassium metal to solution A, and react to obtain solution C after 20 hours. Solution B was obtained by dissolving 1.48 g of chloromethyl polystyrene in 50 mL of toluene at 80-100° C. under nitrogen protection. Add solution C dropwise to solution B evenly. After fully reacting for 10 hours, volatilize the toluene therein, wash and thoroughly dry to obtain the solid-solid phase change material of the present invention. In the reactant, by mass fraction: two polyethylene glycols are 93.84%, potassium is 1.53%, and chloromethyl polystyrene is 4.63%.

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Abstract

The present invention relates to a kind of high molecular solid/solid phase changing material with mixed net and comb structure, and features that polyglycol with two active end radical and polyglycol with one active end radical are fixed onto the high molecular skeleton material to form 3D mixed net and comb structure. The material of the present invention has relatively great phase change enthalpy up to 120 J/g, proper phase change temperature capable of being altered in 0-65 deg.c, stable solid state before and after phase change without supercooling, separating and other unstable phenomenon, high mechanical strength, high solvent resistance, good machining performance, no toxicity, no leakage, no corrosion, no pollution, long service life and other advantages. The present invention may be used widely in solar energy utilization, afterheat recovering, intelligent air conditioner and other fields.

Description

technical field [0001] The invention relates to a polymer solid-solid phase change material with a network-like and comb-like mixed structure and a preparation method thereof. Background technique [0002] Energy storage materials are widely used in practice. The most commonly used materials at home and abroad are solid-liquid phase change materials. When used, they must be sealed with containers, otherwise they will corrode equipment and pollute the environment due to leakage; Special materials can overcome this shortcoming. Common solid-solid phase change materials include polyols and polymers. When polyol energy storage materials are heated above the solid-solid phase transition temperature and change from crystalline solids to plastic crystals, the plastic crystals have a large Large vapor pressure, volatile loss, so that it still needs to be packaged in a container when used, and it is difficult to be practically applied; polymer phase change materials include polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14
Inventor 丁恩勇臧亚南
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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