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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  • Application Information

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Problems solved by technology

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

Method used

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  • 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

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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 ...

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 e...

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 emu...

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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.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a composite nanocapsule phase change material and a preparation method thereof. Background technique [0002] Micro-encapsulated phase change materials (MEPCM) and nano-enhanced phase change materials (NEPCM) are made of phase change materials (Phase Change Material, PCM) as the core material, organic The polymer or inorganic material is the capsule structure of the shell. This capsule structure is used to maintain the shape of the phase change material and to prevent the leakage of its phase transition process. [0003] For the research on microcapsule phase change materials, there are already industrialized products coming out. For example, BASF has sold related products, which are mainly used in construction, solar energy and other fields. The shell material is mainly high molecular organic polymer. However, high-molecular organic polymers have disadvantages ...

Claims

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Application Information

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IPC IPC(8): C09K5/06C08F120/14C08F2/44C08K5/01C08K3/36C01B33/18
Inventor 孙蓉吴晓琳符显珠汤艳丰
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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