A kind of microcapsule phase change energy storage material, its preparation method and application

Abstract

The invention discloses a microcapsule type phase change energy storage material, as well as its preparation method and application. The microcapsule type phase change energy storage material includes a core material and two layers of wall materials, and the inner wall material is polyethyleneimine (PEI ), the outer wall material is polyvinylpyrrolidone (PVP), the core material includes fatty acid ester phase change materials, and the fatty acid includes a carbon chain containing 3 to 18 carbon atoms and an organic compound of 1 to 3 carboxylate esters; the present invention The double-layer microcapsules are prepared by electrostatic force and cross-linking, and the preparation method is simple and can be carried out at room temperature. Compared with traditional phase change materials, the phase change microcapsule material of the present invention has high stability, high coating rate and good heat storage performance. Moreover, the double wall material has high wet strength of PEI microcapsules, dispersion stability of PVP microcapsules, and good chemical and biocompatibility. In striped textiles or cold chain, building materials, aerospace and other fields.

Description

technical field [0001] The invention belongs to the technical field of microcapsules and temperature-changing intelligent materials, and in particular relates to a microcapsule-type phase-change energy storage material, its preparation method and application. Background technique [0002] Phase change material (PCM-Phase Change Material), also known as phase change energy storage material, refers to a material that can be used for energy storage by using a large amount of heat energy absorbed (released) when its state changes. Materials, textiles, aerospace and military fields have important application prospects. However, the single use of phase change materials will face problems such as leakage, pollution, and poor thermal conductivity, which largely limit its application range. The emergence of phase change microcapsules has solved most of these problems. [0003] Polyvinylpyrrolidone (PVP) is a non-ionic polymer compound with both hydrophilic and hydrophobic propertie...

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Problems solved by technology

[0003] Polyvinylpyrrolidone (PVP) is a non-ionic polymer compound with both hydrophilic and hydrophobic properties. PVP microcapsules can be well dispersed in water and organic solvents. At present, it has been used as a microcapsule wall. , have a good binding force with general organic matter and macromolecular substances, and the literature "Research on Polyvinylpyrrolidone (PVP) and UF Resin (UF) Coated Sunfast Yellow G"" etc. use interfacial polymerization to prepare PVP microcapsules, however The natural strength and toughness of PVP capsule wall is low, the capsule wall is easy to break, and the shortcomings of poor shell compactness are difficult to solve

[0004] Polyethyleneimine (PEI) is a water-soluble polymer compound with good stability, good biocompatibility, and high wet strength. The patent "branched polyethyleneimine microcapsules 201810544672.7" uses cross-linking polymerization Preparation of PEI microcapsules, however, its shortcomings such as easy penetration are difficult to solve

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