A kind of phase change microcapsule with controllable supercooling degree and its preparation method and application

Abstract

The invention belongs to the technical field of preparation of functional materials, and discloses a phase-change microcapsule with controllable supercooling degree, its preparation method and application. After the liquid nucleating agent is uniformly mixed with the organic phase change material, microfluidic double emulsification and UV curing are used to obtain phase change microcapsules with uniform and controllable shell thickness and particle size, and the liquid nucleating agent is dispersed in the phase change microcapsules Uniform, with good dispersion and thermal cycle stability, so that the subcooling degree of the capsule is significantly reduced with the increase of the nucleating agent concentration. Use microfluidic technology to strictly control the particle size and shell thickness, eliminate the influence of particle size and shell thickness on the degree of subcooling, and achieve precise regulation of the degree of subcooling. The present invention uses 1,6-hexanediol diacrylate as the shell material, and the monomer is irradiated by an ultraviolet lamp to undergo a crosslinking reaction to polymerize into a solid state at a high speed to form a shell, the method is simple, and the surface of the formed shell is smooth and firm. The invention is suitable for popularization and application of multifunctional phase-change microcapsules in scientific research and industrial production.

Description

technical field [0001] The invention belongs to the technical field of functional material preparation, and particularly relates to a controllable subcooling degree phase change microcapsule and a preparation method and application thereof. Background technique [0002] Phase change materials have the characteristics of absorbing and releasing a large amount of latent heat in the process of liquid-solid phase transition. They are good heat storage materials and have a wide range of applications in the fields of latent heat storage in buildings and thermal control of electronic modules. Paraffin is the most widely used type of organic phase change material, with good economy, high enthalpy value and wide application temperature range. However, during the use of paraffin wax, due to its fluidity and amorphousness, leakage is often caused, which is not conducive to its recycling. Using the microcapsule encapsulation technology, the paraffin phase change material can be encapsu...

AI Technical Summary

Problems solved by technology

Chinese patent (CN106753261A) reduces the subcooling degree of microcapsules by adding composite aluminum and graphite nanoparticles, and has indeed achieved a certain degree of subcooling reduction effect, but when using solid particles as nucleating agents, due to the dispersion of particles Poor, prone to agglomeration and stratification, which is not conducive to the recycling of phase change microcapsules

The main reason for this problem is that there is no way to accurately control the particle size and wall thickness of the capsules in common capsule preparation methods, and the amount of nucleating agent wrapped in the capsules is also inconsistent, so the amount required to eliminate the supercooling degree each time Nucleating agent concentration is always unavailable for reference

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