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Phase change material capsule and preparation method thereof

A technology of phase change materials and capsules, applied in the field of phase change materials, to achieve the effects of eliminating supercooled crystallization, convenient operation, and wide application range

Inactive Publication Date: 2013-03-20
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the capsule preparation technology coated with hydrophilic phase change materials, it is rarely seen in the prior art.

Method used

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  • Phase change material capsule and preparation method thereof
  • Phase change material capsule and preparation method thereof
  • Phase change material capsule and preparation method thereof

Examples

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preparation example Construction

[0033] The present invention simultaneously designs the preparation method (abbreviation preparation method) of phase-change material capsule, and this preparation method adopts the mass composition of capsule described in the present invention and following technology: take polymerized monomer as capsule wall material, take phase-change material as capsule core The mass fraction of the polymerized monomer, phase change material, emulsifier, initiator, and dispersant mixture is mechanically stirred or ultrasonically oscillated at a temperature of 0 to 90 ° C, and the optical microscope or environmental scanning electron microscope is used at any time Observe the particle size of the emulsion droplet in the emulsion until an emulsion with a particle size of 1-1000 microns or below 1 micron is produced, and then under the action of an initiator, the monomer is polymerized by suspension polymerization or in-situ polymerization , maintained at a stirring speed of 100-999r / min for 1...

Embodiment 1

[0046] At 0°C, 1 g of 3-eicosylpyrrole, 17.3 g of pyrrole, 30 g of a saturated aqueous solution of calcium chloride, 49.9 g of ferric bromide, 380 g of chloroform and 10 g of emulsifier polyacrylic acid sodium salt emulsion (solid content 1.8 g) were prepared in 500mW ultrasonic vibration for 1 hour, so that the average diameter of the emulsion droplets reaches 0.7 microns; then stir at 800rpm for 5 hours; stop stirring, and obtain the phase change material nanocapsule emulsion.

[0047] After testing, the average particle diameter of the obtained nanocapsules is 0.9 micron, and the crystallization melting endothermic temperature (T m ) is 29.9°C, the heat of fusion (ΔH m ) is 64J / g, crystallization exothermic temperature (T c ) is 26.1°C, there is no obvious supercooling crystallization phenomenon, and the crystallization enthalpy (ΔH c ) is 65J / g, the mass percent of calcium chloride in the nanocapsule is 30%, and the conductivity of the nanocapsule is 980S / cm.

Embodiment 2

[0049] Under 0 ℃, 3-decyl pyrrole 7.2g, pyrrole 8g, sodium sulfate saturated aqueous solution 31.8g, copper bromide 50g, carbon tetrachloride 300g and emulsifier styrene-maleic anhydride sodium salt emulsion 16g (solid content 3g), oscillating with ultrasonic wave at 500mW for 1 hour, so that the average diameter of the emulsion droplets reaches 0.6 micron; stirring at 800rpm for 5 hours; stopping stirring, to obtain phase change material nanocapsule emulsion.

[0050] After testing, the average particle size of the obtained nanocapsules is 0.8 microns, T m 32.4°C, ΔH m 54J / g, T c 29.1℃, no obvious supercooling crystallization phenomenon, ΔH c 55J / g, the mass percentage of sodium sulfate decahydrate in the nanocapsule is 56%, and the conductivity of the nanocapsule is 870S / cm.

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Abstract

The invention discloses a phase change material capsule and a preparation method thereof. The capsule uses a phase change material to form a core. The capsule is characterized in that the material of the capsule wall at least contains monomer I polymer. The phase change material capsule comprises the following components by weight percent: 20.8-80.1% of phase change material, 9-24.5% of monomer I, 0.4-4.5% of emulsifier and 1-50% of initiator, wherein the monomer I contains at least one of 2-alkylaniline, 3-alkylpyrrole or 3-alkylthiophene, which has C10-50 branched chains and the alkyl has a linear chain structure; the phase change material contains a hydrophilic phase change material or oleophilic phase change material; the emulsifier belongs to micromolecular emulsifier and contains anionic emulsifier, cationic emulsifier, non-ionic emulsifier or polymer type emulsifier; and the initiator contains oxidization-reduction initiator. The preparation method adopts the suspension polymerization method or in-situ polymerization method to prepare the phase change material capsule.

Description

technical field [0001] The invention relates to phase change material technology, in particular to a phase change material capsule and a preparation method thereof. The capsule is a phase change material microcapsule or nanocapsule with functions of heat energy storage and utilization. Background technique [0002] Clean and green energy storage materials have a particularly important strategic position in the national economy and have been a research focus for a long time. Phase change material (PCM) is an energy-saving and environmentally friendly material developed and applied after the 1970s, and it is also a clean and recyclable energy storage material. Phase change materials can absorb or release a large amount of latent heat of phase change during solid-liquid, solid-gas, liquid-gas, and solid-solid phase transitions. Among them, solid-liquid and solid-solid phase change materials are used in HVAC , energy-saving buildings, solar energy utilization and clothing and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06B01J13/14
Inventor 张兴祥王建平石海峰王学晨李红梅
Owner TIANJIN POLYTECHNIC UNIV
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