Microcapsule type phase-change energy-storage material and preparation method and application thereof

Abstract

The invention discloses a microcapsule type phase-change energy-storage material and a preparation method and application thereof. The microcapsule type phase-change energy-storage material comprisesa core material and a double-layer wall material, wherein polymine (PEI) serves as the inner wall material, polyvinylpyrrolidone (PVP) serves as the outer wall material, the core material comprises analiphatic ester type phase-change material, aliphatic acid is an organic compound containing a carbon chain with 3-18 carbon atoms and 1-3 carboxylic esters. Through electrostatic interaction and cross-linking action, double-layer microcapsules are prepared, the preparation method is simple, and the method can be implemented at room temperature. Compared with a traditional phase-change material,the phase-change microcapsule material is high in stability, high in encapsulation rate and high in heat storage capacity. The double-layer wall material has high wet strength of PEI microcapsules anddispersion stability of PVP microcapsules and is high in chemical and biological compatibility, the two wall materials are cross-linked to make the capsule wall material high in compactness, and themicrocapsule type phase-change energy-storage material can be used in the fields of striped textiles or cold chains, building materials, aeronautics, astronautics and the like.

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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