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Phase-transition energy-storage microcapsules and their preparing process

A technology of phase-change energy storage and phase-change materials, which is applied in the field of phase-change energy storage materials and their preparation, can solve problems such as poor chemical stability, poor heat resistance of organic polymers, and non-durability, and achieve easy industrial production and preparation Simple process and good thermal stability

Inactive Publication Date: 2008-11-12
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent application whose publication number is CN1161364A discloses a kind of phase change energy storage microcapsule using melamine resin resin as the capsule wall, but because the melamine resin resin is relatively brittle, the mechanical Poor, not durable
The patent application with the publication number CN1500714A has improved the above-mentioned microcapsules, adopting a double-layer capsule wall structure, but still using organic amine resins, which have poor chemical stability and cannot be used for a long time
[0005] At present, the microcapsules of phase change energy storage materials that have been disclosed all use some organic polymers as the shell materials of the microcapsules. Due to the characteristics of the organic polymers themselves, their chemical stability is generally poor, such as the interfacial polymerization of TDI and organic amines. The surface of the obtained phase change energy storage material microcapsules is easily oxidized, and will turn yellow after a long time of storage, affecting its use
Furthermore, the heat resistance of organic polymers is generally poor, which limits the application range of phase change energy storage material microcapsules

Method used

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  • Phase-transition energy-storage microcapsules and their preparing process
  • Phase-transition energy-storage microcapsules and their preparing process
  • Phase-transition energy-storage microcapsules and their preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Measure 9 mL of 25# phase-change paraffin wax, whose phase-change temperature is 25°C. Add 1.5 grams of sorbitan oleate and polyoxyethylene sorbitan monooleate in a mass ratio of 0.45:0.55. Here, Span80 and Tween80 produced by Xilong Chemical Factory in Shantou City, Guangdong Province are produced at a mass ratio of 0.45. : 0.55 compounded emulsifier. Slowly add about 40mL of distilled water under heating conditions, and then add 1mL of 2.5mol / L sodium chloride, continue heating to 60°C while stirring for 30min to fully emulsify the emulsion.

[0026] After the emulsification is relatively complete, slowly add 10 drops of 10% acetic acid and 7 mL of ethyl orthosilicate, place it in a water bath at 60°C under stirring for 5 hours, age for 5 hours, filter and wash to obtain phase change energy storage microcapsules.

[0027] The particle size distribution of the prepared microcapsule phase change energy storage materials is as follows: figure 1 Shown, D 50 =8.95μm, th...

Embodiment 2

[0029] Measure 11 mL of 30# phase-change paraffin wax, whose phase-change temperature is 30°C. Add 1.5 grams of emulsifiers formulated with Span80 and Tween80 at a ratio of 0.45:0.55. Slowly add about 80mL of distilled water under heating conditions, and then add 1mL of 2.5mol / L sodium chloride, continue heating to 60°C while stirring for 30min to fully emulsify the emulsion.

[0030] After the emulsification is relatively complete, slowly add 5 drops of 1% hydrochloric acid and 6 mL of tetraethyl orthosilicate, place it in a water bath at 60°C under stirring for 7 hours, age for 4 hours, filter and wash to obtain phase change energy storage microcapsules.

[0031] The particle size of the prepared microcapsule phase change energy storage material is D 50 = 6.07 μm. Optical micrographs showed a capsule wall-covered capsule core structure. The enthalpy of the microcapsule during the phase change becomes 111.02 J / g, while the enthalpy of the capsule core 30# phase change para...

Embodiment 3

[0033] Measure 9 mL of 35# phase-change paraffin, whose phase-change temperature is 35°C. Add 1.5 grams of emulsifiers formulated with Span80 and Tween80 at a ratio of 0.4:0.6. Slowly add about 60mL of distilled water under heating conditions, and then add 0.5mL of 2.5mol / L sodium chloride, continue heating to 60°C while stirring for 30min to fully emulsify the emulsion.

[0034] After the emulsification is relatively complete, slowly add 5 drops of 1% hydrochloric acid and 7 mL of ethyl orthosilicate, place it in a water bath at 60°C under stirring for 3 hours, age for 4 hours, filter and wash to obtain phase change energy storage microcapsules.

[0035] The particle size of the prepared microcapsule phase change energy storage material is D 50 = 6.07 μm. Optical micrographs showed a capsule wall-covered capsule core structure. The enthalpy of the microcapsule during the phase change process becomes 87.90 J / g, while the enthalpy of the capsule core 35# phase change paraffi...

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Abstract

The invention provides a phase transformation energy-storage microcapsule and its preparing process, wherein the microcapsule comprises a capsule shell and phase-change material coated thereby, the capsule shell is made of silicon dioxide gel 20-65 wt% of the microcapsule, the phase-change material being organic material amounting to 80-35 wt% of the microcapsule. The raw materials for preparing the microcapsule also include 0.5-3 parts of emulsifying agent, 30-80 parts of distilled water, 0-1 part of addition agent, 5.6-11.2 parts of n-ethyl silicate and 0.05-1 part of catalyst.

Description

technical field [0001] The invention relates to a phase change energy storage material and a preparation method thereof, in particular to a phase change energy storage microcapsule and a preparation method thereof. Background technique [0002] The storage and effective utilization of thermal energy is one of the subjects of renewable energy research. There are many thermal energy sources in production and life, such as solar energy, geothermal energy in nature, industrial waste heat in industrial processes, waste heat, etc. These energy sources are characterized by a large amount, but have the disadvantages of intermittency and instability. Phase change energy storage technology utilizes the phase change latent heat of materials, which can alleviate the contradiction between energy supply and demand in time and space. Therefore, in today's society that highlights energy and environmental problems, phase change energy storage materials are used in building materials, textil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/02B01J13/02
Inventor 唐国翌吕刚缪春燕姚有为翁端
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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