Phase-transition energy-storage microcapsules and their preparing process

A phase-change energy storage and phase-change material technology, applied in the field of phase-change energy storage materials and their preparation, can solve the problems of inability to use for a long time, poor chemical stability, poor heat resistance of organic polymers, etc., and achieve easy industrialization and promotion. , the effect of easy industrial production and simple preparation process

Inactive Publication Date: 2006-10-11
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

[0028] a) Emulsification of phase change materials

[0029] Dissolve 1.5g of CTAB in 30mL of hot water at 50°C. After complete dissolution, add 8mL of 25# phase-change paraffin and 0.5g of n-amyl alcohol, and emulsify for 2min under stirring at 12000 rpm to obtain a milky white emulsion.

[0030] b) Prepolymerization of the cyst wall

[0031] Add 5mL of industrial water glass into 30mL of distilled water, after dissolving, add 1.5mL of 1:1 hydrochloric acid under the condition of stirring, and obtain the water glass prepolymer.

[0032] c) Encapsulation of phase change materials

[0033] Slowly add the emulsion obtained in a) into the water glass prepolymer b), then slowly add 4mL5mol / L NH 4 HCO 3 The solution was placed in a water bath at 50°C and stirred for 3 hours. After filtering and washing, the phase change energy storage microcapsules are obtained.

[0034] The particle size distribution of the prepared microcapsule phase change energy storage materials is as foll...

Embodiment 2

[0036] 8mL of dodecanol was used as the phase change material, and its phase change temperature was 24°C. Other preparation steps and conditions were the same as in Example 1.

[0037] D of the prepared phase change energy storage microcapsules 50 =8.68 μm, the phase change enthalpy of the microcapsule is 116.49 J / g, and the phase change enthalpy of dodecanol is 216.80 J / g, so the content of the phase change energy storage material is 53.7%.

Embodiment 3

[0039] a) Emulsification of phase change materials

[0040] Dissolve 3g of CTAB in 30mL of hot water at 50°C, add 11mL of 25# phase-change paraffin and 1g of n-pentanol after complete dissolution, and emulsify for 2min under stirring at 12000 rpm to obtain a milky white emulsion.

[0041] b) Prepolymerization of the cyst wall

[0042] Add 5mL of industrial water glass into 30mL of distilled water, after dissolving, add 1.1mL of 1:1 hydrochloric acid under the condition of stirring, and obtain the water glass prepolymer.

[0043] c) Encapsulation of phase change materials

[0044] Slowly add the emulsion obtained in a) into the water glass prepolymer b), then slowly add 10mL5mol / L NH 4 HCO 3 The solution was placed in a water bath at 50°C and stirred for 5 hours. After filtering and washing, the phase change energy storage microcapsules are obtained.

[0045] D of the prepared phase change energy storage microcapsules 50 =6.06μm, the phase change enthalpy of the microcaps...

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Abstract

The phase-change storage microcapsule consists of capsule wall and phase-change material covered by it, in which the capsule wall is silicon dioxde deposit with 20-65 % of the total mass of the microcapsule and phase-change material with 80-35 % of the total mass of the microcapsule. The method for preparation of phase-change storage microcapsule includes: adding 0.5-3 parts of surface activator into finite quantities of distilled water, after the heating and the dissolution, then adding 4-12 parts of phase-change storage materials and 0-2 parts of cosurfactants, emulsifying under a condition of high-velocity agitation to obtain the lacte emulsion; dissolving the 3-10 parts of sodium silicate into finite quantities of distilled water, adding finite quantities of 1-2 parts of precipitant A under a condition of agitation to obtain sodium silicate prepolymer; slowly adding the emulsion into the said sodium silicate prepolymer, then adding 2-10 parts of precipitant B, placing the said mixture into a water bath to react for 3-5 hours, after the filtration and the scouring, obtaining the phase-change storage microcapsule.

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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IPC IPC(8): C09D5/02B01J13/02
Inventor 唐国翌吕刚缪春燕姚有为翁端
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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