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Process for preparing nano capsule phase change material emulsion

A phase change material and nanocapsule technology, applied in the field of preparation of nanocapsule phase change material emulsion, can solve the problems of reduced particle thermal conductivity, reduced fluid stability, high fluid viscosity, high latent heat, reduced pumping resistance, The effect of low fluid viscosity

Inactive Publication Date: 2007-01-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the commonly used LFTF, the particle size of the phase change material capsule is on the order of μm, but in the actual use process, it is found that there are the following deficiencies: (1) Due to the large particle size and high viscosity of the fluid, the pump consumption increases; ( 2) The particle size of the capsule is large, and the probability of capsule crushing and damage increases due to the collision between the particles and the pump wall during the pumping process, which reduces the stability of the fluid; (3) The particle size of the capsule is large and the specific surface area is low. Reduced chance of heat conduction between

Method used

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  • Process for preparing nano capsule phase change material emulsion
  • Process for preparing nano capsule phase change material emulsion
  • Process for preparing nano capsule phase change material emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The oil phase liquid that 30g styrene, 30g melting n-octadecane, 0.9g butyl acrylate, 0.3g azobisisobutyronitrile and 0.4g n-dodecanethiol is made into is added to 1.2g compound emulsifier (SDS : OP-10=1:1) and 240g of deionized water, firstly use mechanical stirring for 10min to obtain emulsion, then use ultrasonic cell pulverizer to ultrasonically obtain microemulsion for 15min. Transfer the microemulsion into a 500ml four-neck flask equipped with a reflux tube, nitrogen inlet, mechanical stirring, and a feed port, first stir and pass nitrogen for 30 minutes to remove oxygen from the system, and then heat up to 65°C in a constant temperature water bath under the condensation of the reflux tube The polymerization reaction was carried out for 5 hours, and the nanocapsule phase change material was prepared by naturally cooling to room temperature after the reaction was completed.

Embodiment 2

[0028] 30g of styrene, 45g of molten n-octadecane, 1.2g of acrylic acid, 0.4g of azobisisobutyronitrile and 0.6g of n-dodecanethiol were made into an oil phase liquid, and added to a solution composed of 1.2g of SDS and 240g of deionized water In the process, the emulsion was first obtained by mechanical stirring for 10 minutes, and then the microemulsion was obtained by ultrasonic cell pulverizer for 15 minutes. Transfer the microemulsion into a 500ml four-neck flask equipped with a reflux tube, nitrogen inlet, mechanical stirring, and a feed port, first stir and pass nitrogen for 30 minutes to remove oxygen from the system, and then heat up to 65°C in a constant temperature water bath under the condensation of the reflux tube Polymerization was carried out for 5 hours, and after the reaction was completed, it was naturally cooled to room temperature.

Embodiment 3

[0030] Make 30g methyl methacrylate, 40g molten n-eicosane, 0.9g butyl acrylate, and 0.9g n-dodecanethiol to make an oil phase liquid, add 0.6g potassium persulfate, 1.2g SDS and 240g deionized water In the formed solution, the emulsion was first obtained by mechanical stirring for 10 minutes, and then the microemulsion was obtained by supersonicating for 15 minutes with an ultrasonic cell pulverizer. Transfer the microemulsion into a 500ml four-neck flask equipped with a reflux tube, nitrogen inlet, mechanical stirring, and a feed port, first stir and pass nitrogen for 30 minutes to remove oxygen from the system, and then heat up to 65°C in a constant temperature water bath under the condensation of the reflux tube Polymerization was carried out for 5 hours, and after the reaction was completed, it was naturally cooled to room temperature.

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Abstract

The process of preparing nanometer capsule phase change material emulsion includes adding the oil phase liquid compounded with olefin monomer, hydrophilic monomer, alkane, initiator and n-lauryl mercaptan into the mixed liquid of emulsifier and deionized water via stirring and ultrasonic dispersing to obtain micro emulsion, introducing nitrogen to the micro emulsion system to eliminate oxygen via stirring, reflux condensing, heating to 65 deg.c and constant temperature polymerization reaction for 5 hr, and cooling naturally to room temperature to obtain the nanometer capsule phase change material emulsion. Thus prepared nanometer capsule phase change material emulsion has nanometer size, stable performance, great phase change enthalpy and wide application in latent heat functional hot fluid, heat accumulating and temperature regulating fabric, energy saving building wall and other fields.

Description

technical field [0001] The invention relates to a preparation method of a phase change material, in particular to a preparation method of a nanocapsule phase change material emulsion. Background technique [0002] Latent functionally thermal fluid (LFTF) is a heat transfer fluid with special functions. It uses phase change material particles (usually capsules) to absorb or release latent heat during the phase change process to enhance the heat transfer process. Compared with ordinary single-phase heat transfer fluid, LFTF has a large apparent specific heat, which can significantly increase the heat transfer capacity between the heat transfer fluid and the flow channel wall. novel materials. It can not only be used as a high-efficiency heat transfer medium, greatly improve the effective specific heat and heat transfer performance of the fluid, significantly reduce the size of heat exchangers and hot and cold fluid delivery pipes, and reduce their delivery power consumption,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 方玉堂张正国高学农匡胜严
Owner SOUTH CHINA UNIV OF TECH
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