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Method for preparing nanocapsule powder of urea-formaldehyde-resin-encapsulated phase-change material

A technology of phase change materials and urea-formaldehyde resins, which is applied in the field of nanocapsule powder preparation, can solve problems such as environmental corrosion, phase instability, and limitations of phase change materials, and achieve the effect of reducing costs

Inactive Publication Date: 2011-05-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of phase change materials in many fields is severely limited due to the instability of the phase state during the phase change process and the possible corrosion to the application environment.

Method used

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  • Method for preparing nanocapsule powder of urea-formaldehyde-resin-encapsulated phase-change material
  • Method for preparing nanocapsule powder of urea-formaldehyde-resin-encapsulated phase-change material
  • Method for preparing nanocapsule powder of urea-formaldehyde-resin-encapsulated phase-change material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of prepolymer: first take by weighing 24.892g deionized water, 3g urea, all dissolve urea by stirring, then add 8.108g formaldehyde solution of 37% concentration by weight in the above solution, stir After uniformity, use a 10% triethanolamine aqueous solution to adjust its pH value to 8.5, then slowly drain the resulting mixture into a three-necked flask reaction device equipped with a thermometer, a condenser tube, and a constant pressure burette, and then place the The temperature of the water bath was raised to 70°C, and the reaction was carried out for 1 hour to obtain a prepolymer.

[0031] (2) Preparation of miniemulsion: Weigh 0.4g sodium dodecyl sulfate (SDS) and 0.12g hexadecane (CA), dissolve it in 30g deionized water, and add to it after the surfactant is fully dissolved After adding 6g of paraffin, the mixture was placed in an environment of 50°C to fully melt the paraffin, and then the mixture was immediately placed in an ultrasonic cell pu...

Embodiment 2

[0036] (1) Preparation of prepolymer: first take by weighing 26.595g deionized water, 2g urea, all dissolve urea by stirring, then add 5.405g formaldehyde solution of 37% concentration by weight in the above solution, stir After uniformity, use a 10% triethanolamine aqueous solution to adjust its pH value to 8.5, then slowly drain the resulting mixture into a three-necked flask reaction device equipped with a thermometer, a condenser tube, and a constant pressure burette, and then place the The temperature of the water bath was raised to 70°C, and the reaction was carried out for 1 hour to obtain a prepolymer.

[0037] (2) Preparation of miniemulsion: Weigh 0.4g sodium dodecyl sulfate (SDS) and 0.12g hexadecane (CA), dissolve it in 30g deionized water, and add to it after the surfactant is fully dissolved After adding 8g of paraffin, the mixture was placed in an environment of 50°C to fully melt the paraffin, and then the mixture was immediately placed in an ultrasonic cell pu...

Embodiment 3

[0041] (1) Preparation of prepolymer: first take by weighing 25.914g deionized water, 2.4g urea, all dissolve urea by stirring, then add 6.486g formaldehyde solution of 37% concentration by weight in the above solution, After stirring evenly, adjust its pH value to 8.5 with a 10% triethanolamine aqueous solution by weight, then slowly drain the resulting mixture into a three-necked flask reaction device equipped with a thermometer, a condenser tube, and a constant pressure burette, and then Raise the temperature of the water bath to 70°C and react for 1 hour to obtain a prepolymer.

[0042] (2) Preparation of miniemulsion: Weigh 0.4g sodium dodecyl sulfate (SDS) and 0.12g hexadecane (CA), dissolve it in 30g deionized water, and add to it after the surfactant is fully dissolved After adding 7.2g of paraffin, the mixture was placed in an environment of 50°C to fully melt the paraffin, and then the mixture was immediately placed in an ultrasonic cell pulverizer for ultrasonic tre...

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Abstract

The invention relates to a method for preparing nanocapsule powder of a urea-formaldehyde-resin-encapsulated phase-change material, which comprises the following four steps: (1) preparing prepolymer; (2) preparing miniemulsion; (3) carrying out a polymerization reaction; and (4) extracting capsule powder. Compared with the prior art, the product obtained through the method provided by the invention has great latent heat and high thermal conductivity; and the adopted urea-formaldehyde-resin shell material is very cheap, so that the cost for encapsulation of the phase-change material is greatlylowered, and the encapsulated phase-change material can not outflow when the phase change occurs. The product can be applied to the fields of coating, spinning and the like.

Description

technical field [0001] The invention relates to the field of energy storage composite materials, in particular to a method for preparing nanocapsule powder of phase change materials wrapped with urea-formaldehyde resin. Background technique [0002] As an energy storage material, phase change materials are widely used in many fields, including solar energy systems, industrial waste heat utilization, power peak shaving, textile industry, building energy conservation, medical treatment, agricultural greenhouses, aerospace equipment, etc. However, the application of phase change materials in many fields is severely limited due to the instability of the phase state and the possible corrosion to the application environment during the phase change process. Encapsulation of phase change materials can effectively avoid the limitations of phase change materials during use and greatly expand their application fields. [0003] At present, there are more and more studies on the encapsu...

Claims

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Application Information

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IPC IPC(8): B01J13/14
Inventor 张东徐羽翰
Owner TONGJI UNIV
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