Supercooling-degree-controllable phase-change microcapsule as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of functional material preparation, and discloses a supercooling-degree-controllable phase-change microcapsule as well as a preparation method and application thereof. According to the invention, after a liquid nucleating agent and an organic phase-change material are uniformly mixed, the phase-change microcapsule with uniform and controllable shell thickness and particle size is obtained by adopting micro-fluidic dual emulsification and ultraviolet curing; the liquid nucleating agent is uniformly dispersed in the phase-change microcapsule and has good dispersity and thermal cycling stability, so the supercooling degree of the microcapsule is obviously reduced along with the increase of the concentration of the nucleating agent; and the particle size and the shell thickness are strictly controlled by using a microfluidic technology, so the influence of the particle size and the shell thickness on the degree of supercooling is eliminated, and accurate regulation and control of the degree of supercooling are realized. 1,6-hexanediol diacrylate is used as a shell layer material in the invention, and the monomer is irradiated by an ultraviolet lamp to generate a cross-linking reaction and is polymerized into a solid state at a high speed to form a shell layer; and the above method is simple, and the surface of the formed shell layer is smooth and firm. The supercooling-degree-controllable phase-change microcapsule 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 preparation of functional materials, and in particular relates to a phase-change microcapsule with controllable supercooling degree and its preparation method and application. Background technique [0002] Phase change materials have the characteristics of absorbing and releasing a large amount of latent heat during the liquid-solid phase transition process, and are good heat storage materials. They are widely used in latent heat storage of buildings and thermal control of electronic modules. Paraffin wax is the most widely used organic phase change material, with good economy, high enthalpy and wide application temperature range. However, the fluidity and amorphousness of paraffin often cause leakage during use, which is not conducive to its recycling. The use of microcapsule encapsulation technology can encapsulate paraffin phase change materials in organic or inorganic shells to form phase change micr...

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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