Composite nanocapsule phase-change material and preparation method thereof

A technology of nanocapsules and phase change materials, applied in heat exchange materials, chemical instruments and methods, silicon oxide, etc., can solve problems such as difficult nanometer-sized composite nanocapsule materials, and achieve large specific surface area and high coating efficiency , the effect of reducing the damage of the capsule structure

Active Publication Date: 2013-10-09
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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AI-Extracted Technical Summary

Problems solved by technology

It is difficult to prepare nanometer-sized composite nanocapsule materials by this method, and how to prepare na...
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Method used

And, the primary particle diameter of this composite nanocapsule phase-change material is 50~150 nanometers, and average particle diameter is 50~400 nanometers, and smaller particle diameter brings larger specific surface area, can further improve heat conduction efficiency, It can also reduce the damage to the capsule structure caused by large volume changes during the phase change process, and further improve the stability of the composite n...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention relates to a composite nanocapsule phase-change material and a preparation method thereof. The material is a nanocapsule which takes oil-phase paraffin as a core and a polymethyl methacrylate and silica composite material as a shell, wherein the primary particle size of the nanocapsule is 50 to 150 nm and the average particle size of nanocapsule is 50 to 400 nm. The polymethyl methacrylate has high cladding efficiency and a thick cladding shell layer is favorable for improving the heat stability and the structure stability of the material; the silica has the characteristics of high structural strength, heat stability, mechanical stability, chemical stability, high heat conductivity and the like and remedies the defect that the polymethyl methacrylate has relatively low stability, and the polymethyl methacrylate remedies the defects that the silica has low elasticity and compactness, so stability improvement is promoted; the nanocapsule has small particle size and large specific surface area, so the heat conduction efficiency can be further improved, the damage of the capsule structure caused by large volume change in a phase change process is reduced, and the stability is improved.

Application Domain

SilicaHeat-exchange elements

Technology Topic

NanocapsulesParaffin oils +14

Image

  • Composite nanocapsule phase-change material and preparation method thereof
  • Composite nanocapsule phase-change material and preparation method thereof
  • Composite nanocapsule phase-change material and preparation method thereof

Examples

  • Experimental program(4)

Example Embodiment

[0052] The preparation method of the composite nanocapsule phase change material mentioned above refers to the synergy between the interfacial polymerization reaction and the hydrolysis reaction, which well controls the overall reaction speed of the reaction system, so that the prepared composite nanocapsule phase change material has a good The uniformity and stability of the structure are used to control the primary particle size of the composite nanocapsule phase change material to be 50-400 nanometers and the average particle size to be 50-400 nanometers.
[0053] The introduction of ammonium persulfate, which can be used as both a monomer initiator and an ester hydrolysis catalyst, enables the interfacial polymerization reaction of methyl methacrylate and the interfacial hydrolysis reaction of ethyl orthosilicate to proceed simultaneously, which further improves the phase of the composite nanocapsules. The uniformity and stability of the structure of the variable material can realize the preparation of the composite nanocapsule phase change material with uniform particle size distribution and stable structure.
[0054] In addition, the preparation method of the composite nanocapsule phase change material has simple process, mild reaction conditions, low energy consumption, no organic solvent in the reaction process, environmental protection and safety, short reaction time, and high preparation efficiency.

Example Embodiment

[0056] Example 1
[0057] Preparation of composite nanocapsule phase change material
[0058] (1) A mixture of paraffin, methyl methacrylate and ethyl orthosilicate in the oil phase at a mass ratio of 6:9:1 is obtained;
[0059] (2) After dispersing the above mixture uniformly by ultrasound for 2 minutes, add it to a 500mL round bottom flask, stir with sheet-shaped stainless steel, heat it to 60℃ in a water bath at a stirring speed of 1500 rpm, and add 1 g of dodecane Sodium benzene sulfonate was added to 42.5 mL of deionized water to disperse uniformly, and added to a round bottom flask for emulsification for 20 minutes, then the temperature was raised to 80°C, and the emulsification was continued for 10 minutes at a stirring speed of 1500 rpm to obtain Uniform milky white microemulsion, in which the ratio of the mass of sodium dodecylbenzene sulfonate to the sum of the masses of paraffin, methyl methacrylate and ethyl orthosilicate in the oil phase is 1:13;
[0060] (3) After the emulsification is completed, adjust the temperature of the water bath to 85°C. Dissolve 1 g of ammonium persulfate in 7.5 mL of deionized water, and slowly add dropwise to the round bottom flask to completion. After stirring for 30 minutes at a stirring speed of 1500 revolutions/minute, the speed of mechanical stirring was adjusted to 1000 revolutions/minute, and the temperature of the water bath was adjusted to 80°C. After 1.5 hours of reaction, the hydrolysis reaction and polymerization reaction proceeded to completion. After the reaction solution dropped to room temperature, add 10 mL of saturated NaCl aqueous solution to the room temperature reaction solution for demulsification. After standing for 30 minutes, there was stratification. The layered emulsion was washed with distilled water 6 times by vacuum suction. , And use a vacuum drying oven to vacuum dry at 45 ℃ for 6 hours, and finally obtain a white composite nano-capsule phase change material powder, in which the quality of ammonium persulfate and the oil phase paraffin, methyl methacrylate and ethyl orthosilicate The ratio of the sum of the masses of the esters is 1:16.
[0061] Such as figure 2 As shown, the composite nanocapsule phase change material prepared in Example 1 has an average particle size of 200 nanometers.
[0062] Such as image 3 As shown, the composite nanocapsule phase change material prepared in Example 1 has a primary particle size of 100 nanometers.
[0063] Such as Figure 4 As shown, the particle size distribution uniformity of the composite nanocapsule phase change material prepared in Example 1 is better.
[0064] After testing, the latent heat of the composite nanocapsule phase change material prepared above is 28J/g. After 7440 hours of cooling and heating, the latent heat can still be maintained at 18J/g, indicating the thermal stability of the composite nanocapsule phase change material High sex.

Example Embodiment

[0065] Example 2
[0066] Preparation of composite nanocapsule phase change material
[0067] (1) Mix the oil phase paraffin, methyl methacrylate and ethyl orthosilicate in a mass ratio of 10:15:4 to obtain a mixture;
[0068] (2) After dispersing the above mixture uniformly by ultrasound for 2 minutes, add it to a 500mL round bottom flask, stir with sheet-shaped stainless steel, heat it to 60℃ in a water bath at a stirring speed of 1500 rpm, and add 1 g of dodecane Sodium benzene sulfonate was added to 42.5 mL of deionized water to disperse uniformly, and added to a round bottom flask for emulsification for 10 minutes, then the temperature was raised to 80°C, and the emulsification was continued for 20 minutes at a stirring speed of 1500 rpm to obtain Uniform milky white microemulsion, in which the ratio of the mass of sodium dodecylbenzene sulfonate to the sum of the masses of paraffin, methyl methacrylate and ethyl orthosilicate in the oil phase is 1:25;
[0069] (3) After the emulsification is completed, adjust the temperature of the water bath to 85°C. Dissolve 1 g of ammonium persulfate in 7.5 mL of deionized water, and slowly add dropwise to the round bottom flask to completion. After stirring at a stirring speed of 1500 revolutions/minute for 15 minutes, the speed of mechanical stirring was adjusted to 1000 revolutions/minute, and the temperature of the water bath was adjusted to 85°C. After reacting for 1 hour, the hydrolysis reaction and polymerization reaction proceeded to completion. After the reaction solution dropped to room temperature, add 10 mL of saturated NaCl aqueous solution to the room temperature reaction solution for demulsification. After standing for 30 minutes, there was stratification. The layered emulsion was washed with distilled water 5 times by vacuum suction. , And use a vacuum drying oven to vacuum dry at 50 ℃ for 4 hours, and finally obtain a white composite nano-capsule phase change material powder. Among them, the quality of ammonium persulfate and the oil phase paraffin, methyl methacrylate and ethyl orthosilicate The ratio of the sum of the masses of the esters is 1:25.
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PUM

PropertyMeasurementUnit
Particle size50.0 ~ 400.0nm
The average particle size50.0 ~ 400.0nm
The average particle size200.0nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Improve structural stability
  • Improve coating efficiency
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