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Phase-change energy-storage microcapsules and preparation method thereof

A phase change energy storage, microcapsule technology, applied in microcapsule preparations, microsphere preparation, chemical instruments and methods, etc., can solve the problems of high cost, inability to emulsion, single surfactant, etc., to reduce surface tension, improve Stable, smooth surface effect

Inactive Publication Date: 2016-11-23
NINGBO GREENTECH ENERGY SAVING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As can be seen from the above, at present, the core materials of phase change material microcapsules are all paraffin and long-chain alkanes, which are costly, and the surfactants used are a single one or a mixture of similar types, which cannot really obtain stable Emulsion, so as to obtain microcapsules with smooth surface, uniform particles and high content of phase change materials

Method used

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  • Phase-change energy-storage microcapsules and preparation method thereof
  • Phase-change energy-storage microcapsules and preparation method thereof

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preparation example Construction

[0023] A preparation method of phase change energy storage microcapsules, comprising the following steps:

[0024] a. The preparation process of phase change energy storage microcapsules includes two phases: the continuous phase includes deionized water and emulsifier, and the discontinuous phase includes core material, wall material and initiator;

[0025] b. Under gentle stirring, uniformly mix the continuous phase and the discontinuous phase respectively;

[0026] c. Add the discontinuous phase to the continuous phase reactor, stir rapidly for 5 minutes, and the stirring speed is 3000rpm;

[0027] d. Reduce the stirring speed in step c to 300rpm, raise the temperature to 70°C, keep it for 2 hours, then adjust the temperature to 85°C, and keep it for 5 hours;

[0028] e, stop heating, and naturally cool to room temperature;

[0029] f. Take out the suspension of phase-change energy storage microcapsules, wash them three times to remove unreacted monomers and uncoated monom...

Embodiment 1

[0033]Under gentle stirring, stir the discontinuous phase 50g tallow propyl ester, 25g methyl methacrylate (MMA), 25g pentaerythritol tetraacrylate (PETRA) and 2.5g benzoyl peroxide (BPO) until well mixed , the continuous phase 400g deionized water, 2.5g polyvinylpyrrolidone (PVP) and 2.5g sodium dodecyl sulfate (SDS) are mixed uniformly in another reactor, and the above-mentioned discontinuous phase is added in the continuous phase reactor, Then stir rapidly for 5 minutes, wherein the stirring speed is 3000rpm, then reduce the stirring speed to 300rpm, and increase the temperature to 70°C, hold for 2 hours, then adjust the temperature to 85°C, and hold for 5 hours, then stop heating , naturally cool down to room temperature, take out the suspension of phase change material microcapsules, wash 3 times to remove unreacted monomers and uncoated monomers, and then dry in an oven at 50°C for 48 hours to obtain the product phase Change material microcapsules, the phase transition t...

Embodiment 2

[0035] Under gentle stirring, stir the discontinuous phase 50g tallow methyl ester, 8g methyl methacrylate (MMA), 8g pentaerythritol tetraacrylate (PETRA) and 0.3g benzoyl peroxide (BPO) and mix well , the continuous phase 400g deionized water, 3.3g polyvinyl alcohol (PVA) and 3.3g sodium dodecyl sulfate (SDS) are mixed uniformly in another reactor, and the above-mentioned discontinuous phase is added in the continuous phase reactor, Then stir rapidly for 5 minutes, wherein the stirring speed is 3000rpm, then reduce the stirring speed to 300rpm, and raise the temperature to 70°C and keep it for 2 hours, then adjust the temperature to 85°C and keep it for 5 hours, then stop Heating, cooling down to room temperature naturally, taking out the suspension of phase change material microcapsules, washing 3 times to remove unreacted monomers and uncoated monomers, and drying in an oven at 50°C for 48 hours to obtain the product Phase change material microcapsules, the microcapsules ha...

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Abstract

The invention relates to phase-change energy-storage microcapsules and a preparation method thereof; the phase-change energy-storage microcapsules are prepared from a core material, a wall material, an emulsifier, an initiator and deionized water; the core material is fatty acid ester, the wall material comprises methyl methacrylate and pentaerythritol tetraacrylate, the emulsifier is formed by mixing a nonionic surfactant and an ionic surfactant with the ratio of 1 to 1, the initiator is benzoyl peroxide, the mass ratio of the core material to the wall material is 1:1-1:4, the content of the emulsifier is 5-10% of the total mass of the core material and the wall material, the content of the initiator is 2-5% of the mass of the wall material, and the ratio of the total mass of the core material and the wall material to the mass of the deionized water is 1:4-1:6; a low-cost fatty acid ester is used as a phase change material, a mixture of the ionic surfactant and the nonionic surfactant is used as the emulsifier, a capsule wall is formed through cross-linking polymerization with combination of a suspension polymerization technology, and the phase-change microcapsules with smooth surface, uniform particles and high phase change material content are obtained.

Description

technical field [0001] The invention belongs to the technical field of new material phase-change energy storage materials, and in particular relates to a phase-change energy storage microcapsule and a preparation method thereof. Background technique [0002] Phase change materials (Phase Change Materials, PCMs) refer to the process of phase change, which can absorb heat from the environment or release heat to the environment, so as to achieve the purpose of energy storage and release, and solve the problem of energy supply and demand in time and space. mismatched contradictions. Taking advantage of this feature, PCMs have broad application prospects in the fields of solar energy utilization, "peak shifting and valley filling" of electricity, waste heat and waste heat recovery, energy-saving building materials, energy saving of air conditioners, and food preservation. At the same time, because the temperature is approximately constant during the phase transition, it can be u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/14
Inventor 夏抒兰培强穆罕默德·法瑞德
Owner NINGBO GREENTECH ENERGY SAVING TECH
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