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Phase-change microcapsules with solid-solid phase transition core material, and preparation method thereof

A technology of phase-change microcapsules and phase-change core materials, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., to achieve the effects of controllable size, easy-to-obtain raw materials, and simple preparation methods

Active Publication Date: 2013-03-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, so far, most of the phase change core materials of phase change microcapsules are phase change materials with solid-liquid transition properties, and the method of preparing phase change microcapsules using core materials with solid-solid phase transition properties has never been reported.

Method used

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  • Phase-change microcapsules with solid-solid phase transition core material, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] 1) Preparation of monomer solution: take 1 g of octadecyl acrylate, and raise the temperature above its melting point, add AIBN accounting for 0.2 wt% of the total amount of stearyl acrylate and AIBN and stir to make the octadecyl acrylate The ester is fully dissolved to obtain a solution of octadecyl acrylate monomer;

[0024] 2) Preparation of phase-change core material emulsion: add 0.25g Triton-100 (Triton-X100) and 50ml deionized water into a 150ml three-neck flask; emulsify the above at a stirring speed of 200rpm-400rpm The temperature of the emulsifier aqueous solution is gradually raised from room temperature to 70° C.; all the solution of stearyl acrylate monomer obtained in step 1) is added to the emulsifier aqueous solution, and stirred evenly to obtain a phase-change core material emulsion;

[0025] 3) Synthesis of melamine resin wall material prepolymer solution: 0.3g melamine, 3ml mass concentration of 37% formaldehyde and 5ml deionized water are mixed to ...

Embodiment 2

[0028] 1) Preparation of the monomer solution: take 3.6g lauryl acrylate, and raise the temperature above its melting point, add AIBN accounting for 0.5wt% of the total amount of the lauryl acrylate and AIBN and stir to make the acrylic acid ten The diester is fully dissolved to obtain a solution of lauryl acrylate monomer;

[0029] 2) Preparation of phase change core material emulsion: add 0.25g Triton-100 (Triton-X100) and 50ml deionized water into a 150ml three-necked flask; The temperature of the aqueous solution is gradually raised from room temperature to 70° C.; all the lauryl acrylate monomer solution obtained in step 1) is added to the emulsifier aqueous solution, and stirred evenly to obtain a phase-change core material emulsion;

[0030] 3) Synthesis of melamine resin wall material prepolymer solution: 0.3 g of melamine, 3 ml of formaldehyde with a mass concentration of 37% and 5 ml of deionized water are mixed to obtain a mixed solution, and the pH value of the mix...

Embodiment 3

[0033] 1) Preparation of monomer solution: take 0.1g cetyl acrylate, and raise the temperature above its melting point, add AIBN accounting for 0.2wt% of the total amount of cetyl acrylate and AIBN and stir to make the cetyl acrylate The hexaester is fully dissolved to obtain a solution of hexadecyl acrylate monomer;

[0034] 2) Preparation of phase-change core material emulsion: 0.25g Tween 60 and 50ml deionized water were added to a 150ml three-necked flask; while the stirring speed was 800rpm-1000rpm, the temperature of the above-mentioned emulsifier aqueous solution was gradually changed from room temperature to The temperature is raised to 70° C.; all the cetyl acrylate monomer solution obtained in step 1) is added to the emulsifier aqueous solution, and stirred evenly to obtain a phase change core material emulsion;

[0035] 3) Synthesis of melamine resin wall material prepolymer solution: 0.3g melamine, 3ml mass concentration of 37% formaldehyde and 5ml deionized water ...

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Abstract

The invention relates to phase-change microcapsules with a solid-solid phase transition core material, and a preparation method thereof. The preparation method provided by the invention adopts a first coating and then in-situ polymerization method. A comb-type polymer with large amount of long-chain alkyl side-chain grafted on a main chain, such as polyacrylate, is adopted as a phase-change microcapsule core material; and a heat-resistant high-molecular material is adopted as a capsule wall for coating the core material, such that the phase-change microcapsule material is prepared. The phase-change microcapsule material is composed of a phase-change core material with polyacrylate with solid-solid phase transition property and with C12-C20 alkyl chain contained in the side-chain, and a melamine resin wall material with good heat resistance. The content of polyacrylate in the phase-change microcapsules is 5-80wt%. The phase-change microcapsules provided by the invention have good dimension controllability, and are in a monodisperse state. The heat resistance of the microcapsules is better than that of traditional phase-change microcapsules with small-molecular long-chain alkane as the core material. Therefore, application requirements by fields with higher requirements on heat resistance can be satisfied.

Description

technical field [0001] The invention relates to a phase change microcapsule with a solid-solid phase change core material and a preparation method thereof Background technique [0002] As the world's energy problems and environmental problems become more and more serious, energy conservation and environmental protection have become important issues in the field of energy applications. In order to improve the efficiency of energy utilization, the research on energy-saving technology using the phase-change latent heat of phase-change materials for energy storage and reuse has been paid more and more attention. Because phase change microcapsules can absorb, store and emit a large amount of latent heat in the temperature range of phase change, so as to achieve the purpose of controlling the ambient temperature and saving energy, they have received more and more attention. It has broad application prospects in fields such as heat energy recovery. [0003] Phase-change microcaps...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/02B01J13/18
Inventor 孔磊张秀芹姜凯赵莹王笃金
Owner INST OF CHEM CHINESE ACAD OF SCI
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