Preparation method of comb-type polymer phase change energy storage material

A technology of phase-change energy storage materials and comb-like polymers, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of unstable heat storage performance, narrow application range, and low heat enthalpy of polyethylene glycol , to achieve the effects of good degradation resistance, good applicability and fast response speed

Inactive Publication Date: 2011-09-28
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned invention patent applications all use polyethylene glycol as a phase change material, which has a narrow scope of application, and polyethylene glycol has a low enthalpy, which is prone to degradation after long-term use, and its heat storage performance is unstable.

Method used

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  • Preparation method of comb-type polymer phase change energy storage material
  • Preparation method of comb-type polymer phase change energy storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] PVA (degree of polymerization 1780, degree of hydrolysis 98%) is placed in an oven and dried at 100°C for more than 6 hours until constant weight; 3% of its mass of CaH is added to the solvent DMF 2 , and then purified by distillation under reduced pressure to obtain dry DMF for later use; mix the dried PVA with DMF and NaH twice its mass, heat up to 50°C to dissolve, stir and mix evenly, and react for 4 hours to obtain a PVA metallization product; dry 1-Bromooctadecane is dissolved in DMF to form a solution with a mass fraction of 20%, and then the prepared solution is added dropwise at a speed of 1mL / min to control the ratio between 1-Bromooctadecane and PVA. Molar ratio is 1: 1, add the catalyst DBTDL of mass 0.01%, vigorously stir, and keep reaction temperature 75 ℃, react 10h, until complete reaction, obtain the primary product of the copolymer of 1-octadecane grafted PVA; The primary product was extracted with acetone for 4 hours to remove unreacted PVA, and the p...

Embodiment 2

[0035] The molar ratio between 1-bromooctadecane and PVA in Example 1 was adjusted to 0.8:1, and the rest were the same as in Example 1. The properties of the obtained phase change material are listed in Table 1.

Embodiment 3

[0037] The molar ratio between 1-bromooctadecane and PVA in Example 1 was adjusted to 0.4:1, and the rest were the same as in Example 1. The properties of the obtained phase change material are listed in Table 1.

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Abstract

The invention discloses a preparation method of a comb-type polymer phase change energy storage material. The preparation method comprises the following steps: firstly, dissolving polymers such as dried poval and the like in a solvent the amount of which is 2-4 times that of the polymers, and then carrying out metallization reaction on the mixture and one of calcium hydride, sodium hydride, potassium hydride, sodium methoxide, sodium ethoxide, potassium methoxide or potassium ethoxide; stirring and reacting for 1-4 hours in the solvent at the temperature of 30-60 DEG C so as to obtain a polymer metalized product with an active group; adding at leas one of 1-halognated n-alkanes, wherein the molar ratio of the 1-halognated n-alkane to the polymers such as poval and the like is (0.1:1)-(6:1), and the adding speed is controlled at 1-10mL/min; adding a catalyst the weight of which is 0.01-1% of that of the polymers such as poval and the like; and stirring and carrying out grafting reaction for 4-12 hours in the solvent at the temperature of 30-90 DEG C; and washing the obtained product for impurity removal and drying, so as to obtain the comb-type polymer phase change energy storage material.

Description

technical field [0001] The invention relates to a preparation technology of a phase-change energy storage material, in particular to a preparation method of a comb-shaped polymer phase-change energy storage material with functions of thermal energy storage and utilization. Background technique [0002] A phase change material (PCM) is a material that can change its physical state (solid-liquid, liquid-gas and solid-solid) within a certain temperature range to achieve heat storage and release functions. During the phase change process, a large amount of latent heat of phase change can be absorbed or released, while the temperature of the material itself remains unchanged. Therefore, phase change materials are widely used in the fields of intelligent temperature-adjusting clothing, solar energy utilization, construction and electronic devices. [0003] At present, low-molecular materials or oligomers commonly used as phase change materials, such as hydrated inorganic salts, lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/05C08F16/06C08F8/02C08F8/42C08F20/56C09K5/02C08G69/48C08F20/06C08B31/10C08F20/44C08G73/04
Inventor 石海峰张兴祥李丽娟尹亿平王学晨
Owner TIANJIN POLYTECHNIC UNIV
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