Low super-cooling degree phase-change material microcapsule and preparation method thereof

Abstract

The invention discloses a low super-cooling degree phase-change material microcapsule and a preparation method thereof. The microcapsule is composed of, by weight, 35-70% of a capsule core and 30-65% of a capsule wall, the capsule core is composed of, by weight, 81.1%-97.6% of an organic phase-change material, 0.1-16.9% of a super-cooling inhibitor and 1.2-2.7% of initiator, and the super-cooling inhibitor is at least one of N,N-diethyl acrylamide and N-isopropyl acrylamide; the capsule wall comprises, by weight, copolymer of 80-95% of methacrylic acid alkyl ester/aryl ester and 5-20% of an alkene propyl ester cross-linking agent; the low super-cooling degree phase-change material microcapsule is prepared by preparing, mixing and reacting of a water-phase mixture and an oil-phase mixture. The phase-change material microcapsule has the advantages that the coating rate is high, the heat storage quantity is high, the thermal performance is excellent, and the super-cooling crystallization phenomenon is particularly improved significantly; the technology is simple, the operation is convenient, the application range is wide, and the industrial implementation is facilitated.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a microcapsule of a phase change material with low supercooling degree and a preparation method thereof. Background technique [0002] Phase change materials refer to a class of substances that change their physical properties with temperature changes and can provide a large amount of latent heat. The microcapsule phase change material obtained by introducing microcapsule technology into the phase change material is a good performance cycle energy storage composite material, which can be used as an energy storage device in energy-saving buildings, heat exchange, temperature control, fiber and textiles, aerospace and military Fields and other aspects have a wide range of roles (Cui Jinfeng, Cui Zhuo, Zhou Yingping, et al. Research progress in microcapsule phase change materials [J]. China Paint, 2013,28(9): 005.). Microcapsule phase change materials are particl...

AI Technical Summary

Problems solved by technology

However, the addition of nucleating agents will reduce the content of phase change materials in the microcapsules, and further decrease with the increase of the added amount; linear alkanol (hydrophilic hydroxyl) and sodium chloride (demulsibility) When used as a nucleating agent, the microcapsule phase change material is prone to agglomeration; nanoparticles are not an ideal nucleating agent because of their poor miscibility with the core material; polyaniline is used as a nucleating agent in a two-step method The black color of the prepared microcapsules is unfavorable to the subsequent processing (Nan Guanghua, Wang Jianping, Wang Yan, et al. Preparation and properties of phase change material nanocapsules containing polyaniline[J]. Acta Physicochemical Sinica, 2014, 2: 021. )

Chinese invention patent (CN 102876297A) discloses a two-step method to synthesize low-supercooled phase-change material microcapsules with polypyrrole as a nucleating agent. The preparation process is not perfect, and the microcapsules also have the problem of color change.

Images