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Nanocapsule phase-change material for cold storage and preparation thereof

A nanocapsule and phase change cold storage technology, which is applied in the direction of microcapsule preparation, microsphere preparation, heat exchange materials, etc., can solve the problems of low cold storage temperature and low cold storage density, achieve enhanced heat transfer capacity, reduce preparation cost, The effect of improving coating efficiency

Inactive Publication Date: 2008-11-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can overcome the shortcomings of low cold storage density of water storage air conditioning system and low storage temperature of ice storage air conditioning system, improve the cold storage capacity and efficiency of cold storage air conditioning system, and improve the economy of cold storage air conditioning system

Method used

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  • Nanocapsule phase-change material for cold storage and preparation thereof

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Embodiment 1

[0025] A nanocapsule phase-change cold storage material according to the present invention comprises a core material and a capsule wall material, the core material is the capsule core material, the capsule wall wall material is the capsule wall, and the capsule core made of the phase-change cold storage material The substance is coated in the capsule wall made of urea-formaldehyde resin. The capsule core and the capsule wall are formed in a mass ratio of 5:3.

[0026] A preparation method of the above-mentioned nanocapsules, comprising the following steps:

[0027] (1) Prepolymer preparation: Add 2 g of urea and 12 g of formaldehyde into a conical flask, add 20 mL of deionized water to dilute, and adjust the pH value to 7-8 with triethanolamine after the urea is completely dissolved. The reaction was heated and stirred with a magnetic stirrer for 1 hour, the temperature was controlled at 70° C., and the rotational speed was controlled at 200 rpm. After completion, add 20mL h...

Embodiment 2

[0032] Another nanocapsule phase-change cold storage material according to the present invention includes a capsule core and a capsule wall, and the capsule core made of phase-change cold storage material is covered in the capsule wall made of urea-formaldehyde resin. The capsule core and the capsule wall are formed in a mass ratio of 5:2.

[0033] A preparation method of the above-mentioned nanocapsules, comprising the following steps:

[0034] (1) Preparation of prepolymer: Add 3 g of urea and 14 g of formaldehyde into a conical flask, add 20 mL of deionized water for dilution, and adjust the pH value to 7-8 with triethanolamine after the urea is completely dissolved. The reaction was heated and stirred with a magnetic stirrer for 1 hour, the temperature was controlled at 60° C., and the rotational speed was controlled at 200 rpm. After completion, add 20mL hot water to dilute.

[0035] (2) Emulsion preparation: Add 0.8g of sodium lauryl sulfate emulsifier, 2g of resorcino...

Embodiment 3

[0039]Another nanocapsule phase-change cold storage material according to the present invention includes a capsule core and a capsule wall, and the capsule core made of phase-change cold storage material is covered in the capsule wall made of urea-formaldehyde resin. The capsule core and the capsule wall are formed in a mass ratio of 10:3.

[0040] A preparation method of the above-mentioned nanocapsules, comprising the following steps:

[0041] (1) Preparation of prepolymer: Add 3 g of urea and 16 g of formaldehyde into a conical flask, add 20 mL of deionized water to dilute, and adjust the pH value to 7-8 with triethanolamine after the urea is completely dissolved. The reaction was heated and stirred with a magnetic stirrer for 1 hour, the temperature was controlled at 80° C., and the rotational speed was controlled at 200 rpm. After completion, add 20 mL of hot water to dilute.

[0042] (2) Emulsion preparation: Add 1g of sodium lauryl sulfate emulsifier, 3g of resorcinol...

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Abstract

The invention discloses a nano-encapsulated phase change cold accumulation material and a preparation method thereof. The nano-encapsulated phase change cold accumulation material includes core materials and capsule wall materials, wherein, the core materials are made of organic phase change cold accumulation materials, while the capsule wall materials are made of urea formaldehyde resin; the mass ratio of the core materials to the wall materials is 5:3 or 5:2 or 10:3. The nano-capsule wall materials are formed by the polymerization reaction of two monomers, one is an oil-soluble monomer, and the other is a water-soluble monomer; the oil-soluble monomer and the water-soluble monomer are positioned inside and outside the drop of the core material respectively, and a polymer thin film is formed by carrying out reaction on the surface of the drop of the core material, wherein, preparing prepolymer first, then preparing emulsion and polymerizing, finally carrying out after-treatment to obtain the nano-encapsulated phase change cold accumulation material. The invention improves the technology of the preparation, increases encapsulation efficiency, reduces the cost of the preparation, and enhances the properties of the capsules.

Description

technical field [0001] The invention relates to a cold storage material, in particular to a nanocapsule phase change cold storage material and a preparation method thereof. Background technique [0002] In recent years, due to the rapid development of my country's economy, air-conditioning systems have been popularized in large and medium-sized cities. In the electric load of the entire city, the electric load of air-conditioning systems occupies a considerable proportion, about 30-40%. However, the peak hours of the electric load of the air-conditioning system overlap with the peak hours of the electric load of the whole city, which causes the power supply to be tight during the peak hours, and also leads to the surplus of electric loads during the low valleys. Therefore, add a cold storage system to the existing air-conditioning system to fully store and utilize the cooling capacity generated by electricity during the off-peak period, and release the stored cooling capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/02B01J13/14C08G12/36
Inventor 方贵银杨帆张曼吴双茂刘旭
Owner NANJING UNIV
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