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Method for preparing comb-shaped macromolecular solid-solid phase change material

A technology of polymer type and phase change materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of low enthalpy of polyethylene glycol, narrow application range, difficult to guarantee grafting rate, etc. The effect of less reaction, good applicability, and good thermal stability

Active Publication Date: 2013-04-03
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two invention patent applications use polyethylene glycol as the phase change material, which has the following defects: the scope of application is narrow; the enthalpy of polyethylene glycol is low, it is easy to degrade after long-term use, and the heat storage performance is unstable; the use of polymer As a grafting raw material, the grafting rate is difficult to guarantee due to the low reactivity of the terminal hydroxyl groups of the polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Cellulose (α-cellulose content 98%) powder is placed in an oven and dried at 100°C for more than 6 hours until constant weight; n-hexadecyl acrylate is purified by vacuum distillation; 500g of cellulose is mixed with 2000mL of deionized water, and the temperature is raised To 60°C, under stirring at 200r / min, add 10g of potassium persulfate-sodium bisulfite (mass 2:1), add 1500g of n-hexadecyl acrylate, and react for 12h; The product was washed three times with deionized water and toluene respectively to remove the initiator, unreacted n-hexadecyl acrylate and n-hexadecyl polyacrylate, and then the purified product was placed in a vacuum oven and dried for 24 hours to obtain the obtained phase change materials described above.

[0023] Using NETZSCH DSC 200 F3 differential scanning calorimeter (DSC), under the protection of nitrogen, test (the test method of the following examples is the same) DSC scanning curve of 10 ℃ / min heating process and -10 ℃ / min cooling process,...

Embodiment 2

[0026] Cellulose (β-cellulose content 98%) powder is placed in an oven, dried at 100°C for more than 6 hours until constant weight; n-hexadecyl acrylate is purified by distillation under reduced pressure; 500g of cellulose is mixed with 2000mL of deionized water, and the temperature is raised To 90°C, under stirring at 50r / min, add 1g of ammonium persulfate-sodium bisulfite (mass 2:1), add 150g of n-hexadecyl acrylate, and react for 8h; Wash with deionized water and toluene three times respectively; place the purified product in a vacuum oven and dry for 24 hours to obtain the phase change material.

[0027] The endothermic temperature of the phase change material obtained in this example is 35.1°C, the melting enthalpy is 14J / g, the exothermic temperature is 33.0°C, and the crystallization enthalpy is 15J / g; The liquid phase proves that the obtained phase change material is a solid-solid phase change material; its thermal decomposition temperature is measured to be 265°C.

Embodiment 3

[0029] Cashmere (average length 23mm) is placed in an oven, dried at 98°C for more than 4 hours until constant weight; n-octadecyl methacrylate is purified by vacuum distillation; 1000g cashmere is mixed with 2000mL formic acid, heated to 50°C, 150r Under stirring / min, 1 g of cerium nitrate and 1000 g of n-octadecyl methacrylate were added, and the reaction was carried out for 18 hours; the product was in the form of a gel, and was separated by centrifugation, and the product was washed three times with deionized water and acetone respectively. After the purified product was dried in a vacuum oven for 24 hours, the phase change material was obtained.

[0030] The endothermic temperature of the phase change material obtained in this example is 37.4°C, the melting enthalpy is 34J / g, the exothermic temperature is 33.4°C, and the crystallization enthalpy is 35J / g; The liquid phase proves that the obtained phase change material is a solid-solid phase change material; its thermal de...

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Abstract

The invention discloses a method for preparing a comb-shaped macromolecular solid-solid phase change material. The method comprises the following processes of: adding at least one of macromolecular compounds containing hydroxy, amino or carboxyl into a dispersion liquid to form a uniformly dispersed suspension, heating the suspension to the temperature between 50 DEG C and 95 DEG C to react at the stirring speed of 50-400r / min, adding a catalyst or an initiator in an amount which is 0.1-2 percent of the mass of the macromolecular compound, then adding (methyl) acrylic n-alkyl ester in an amount which is 30-300 percent of the mass of the macromolecular compound, reacting for 6-24 h at the same stirring speed, washing the obtained reaction product for three times with deionized water and anorganic solvent respectively, and drying the reaction product to obtain the comb-shaped macromolecular solid-solid phase change material. The dispersion liquid is water, formic acid, acetic acid, methanol or ethanol; and the organic solvent is capable of dissolving the (methyl) acrylic n-alkyl ester and poly (methyl) acrylic n-alkyl ester.

Description

technical field [0001] The invention relates to phase change material technology, in particular to a method for preparing a comb-shaped polymer solid-solid phase change material with thermal energy storage and release functions. Background technique [0002] During the phase change process, phase change materials can absorb or release a large amount of latent heat of phase change, and are widely used in aerospace, HVAC, energy-saving buildings, solar energy utilization, electrical cooling, waste heat recovery, clothing and other fields. " aspect is also important. Solid-solid phase change material is a kind of phase change material, which is always in solid state during the phase change process, with small volume change and no liquid leakage, so it has important applications in many fields. [0003] Chinese invention patent (CN1616588A) discloses a polymer phase change material with two active end groups-polyethylene glycol and polyethylene glycol with one active end group ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02C08F251/00C08F220/18D06M14/06D06M14/04C09K5/02
Inventor 张兴祥石海峰王学晨李丽娟李剑华
Owner TIANJIN POLYTECHNIC UNIV
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