Microcapsule composite phase change material based on inorganic hydrous salt as well as preparation method and application thereof

A technology of composite phase change materials and inorganic hydrated salts, applied in heat exchange materials, chemical instruments and methods, etc.

Inactive Publication Date: 2013-12-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although Chinese patent 200510024706.2 discloses the technology of synthesizing inorganic phase change energy storage microcapsules by solution precipitation polymerization, there is no similar report on the preparation of inorganic hydrated salt microcapsule composite phase change materials by water-in-oil emulsion dispersion polymerization technology

Method used

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  • Microcapsule composite phase change material based on inorganic hydrous salt as well as preparation method and application thereof
  • Microcapsule composite phase change material based on inorganic hydrous salt as well as preparation method and application thereof
  • Microcapsule composite phase change material based on inorganic hydrous salt as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0030] 6.0kg CaCl 2 ·6H 2 0. Add 10 kg of water and 0.1 kg of potassium persulfate to 100 kg of a cyclohexane solution containing 2wt.% sodium dodecylsulfonate in mass percent, and stir and emulsify at a speed of 8000 rpm for 3 h in a constant temperature water bath at 35 ° C. Forms a stable W / O emulsion. 4.0kg styrene monomer is added in this W / O emulsion, is heated up to 70 ℃, initiates polymerization reaction, and initiator constantly diffuses to the interface of micelle and solvent, polymerizes step by step, reacts 24h, obtains white product solution, will The solution is continuously washed with acetone for several times, and then cleaned with deionized water, filtered by suction for many times, and dried to obtain the product.

[0031] In this way, the inorganic hydrate salt microcapsule composite phase change material coated with polystyrene wall material is obtained. Its phase transition temperature is 72.34°C, and its phase transition enthalpy is 31.78 J / g.

Embodiment 2

[0033] 6.0kg CaCl 2 ·6H 2 O, 100mL of water and 0.1kg of potassium persulfate were added to 10.0kg of cyclohexane solution containing 0.2wt.% sodium lauryl sulfate by mass percentage, in a constant temperature water bath at 35°C, stirred and emulsified at a speed of 8000rpm for 3h , forming a stable W / O emulsion. 4.0kg styrene monomer is added in this W / O emulsion, is heated up to 70 ℃, initiates polymerization reaction, and initiator constantly diffuses to the interface of micelle and solvent, polymerizes step by step, reacts 24h, obtains white product solution, will The solution is continuously washed with acetone for several times, and then cleaned with deionized water, filtered by suction for many times, and dried to obtain the product.

[0034] In this way, the inorganic hydrate salt microcapsule composite phase change material coated with polystyrene wall material is obtained. Its phase transition temperature is 67.59°C, and its phase transition enthalpy is 30.93 J / g....

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Abstract

The invention relates to a microcapsule composite phase change material based on an inorganic hydrous salt and a preparation method thereof. The material is a composite phase change material with a shell-core structure, wherein the microcapsule wall material is polystyrene, polymethyl methacrylate and the like; and the core material is an inorganic hydrous salt phase change material (for example Na2SO4.10H2O, CaCl2.6H2O, Na2HPO4.12H2O, Na2CO3.10H2O). The internal phase change material can be protected from being polluted and prevented from being leaked and run away by the polymer wall material. According to the invention, an emulsification dispersion polymerization technology is adopted for carrying out emulsification dispersion on a hydrophilic inorganic salt core material in an organic solvent to form a stable W / O (Water-In-Oil) emulsion, and a water-soluble initiator is added, so that a polymer monomer generates polymerization reaction on a micellar surface to obtain the microcapsule composite phase change material of a hydrous salt phase change material coated by the polymer wall.

Description

technical field [0001] The invention relates to an inorganic hydrated salt-based microcapsule composite phase change material and a preparation method thereof. Background technique [0002] With the increasing energy shortage and environmental pollution, energy conservation and emission reduction has become a hot spot at home and abroad. Improving energy utilization and developing energy storage technologies are important means to achieve energy conservation and emission reduction. At present, phase change materials have been widely used in alleviating the energy crisis and improving energy utilization because they can effectively store heat and regulate temperature by utilizing the endothermic and exothermic effects of substances during the phase change process. [0003] As an inorganic phase change material, crystalline hydrated salt has the advantages of high heat of fusion, good thermal conductivity, low cost, and non-toxicity. It is widely used in energy storage fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C08F112/08C08F120/14C08F2/32C08K3/30C08K3/16C08K3/32C08K3/26
Inventor 孙立贤张焕芝徐芬赵梓名张箭
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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