A kind of phase change material capsule and preparation method thereof

Abstract

The invention discloses a phase-change material capsule and a preparation method thereof. The capsule uses a phase-change material as a capsule core and is characterized in that: a capsule wall material of the capsule at least comprises a monomer I polymer. The phase-change material capsule comprises the following materials in percentage by mass: 20.8 to 84.3 percent of phase-change material, 9 to 72.5 percent of monomer I, 0.4 to 4.5 percent of emulsifying agent and 0.1 to 2.2 percent of initiator, wherein the monomer I is a monomer comprising a crystallizable branch and comprises but not limited to at least one of crylic acid alkyl ester of which the branch contains 10 to 50 carbon atoms or methacrylic acid alkyl ester of 10 to 50 carbon atoms; the alkyl has a straight chain structure; the emulsifying agent is a micromolecule emulsifying agent and comprises an anionic, cationic, nonionic or polymer emulsifying agent; and the initiator comprises but not limited to a radical initiator or an oxidation-reduction initiator. In the preparation method, the phase-change material capsule is prepared by a suspension polymerization method or an in-situ polymerization method.

Description

Technical field [0001] The present invention relates to phase change material technology, in particular to a phase change material capsule and a preparation method thereof. The capsule is a phase change material microcapsule or nanocapsule with thermal energy storage and utilization functions. Background technique [0002] Clean and green energy storage materials have a particularly important strategic position in the national economy and have been a long-term research focus. Phase change material (PCM) is an energy-saving and environmentally friendly material developed and applied after the 1970s, and it is also a clean and recyclable energy storage material. Phase change materials can absorb or release a large amount of latent heat of phase change in the process of solid-liquid, solid-gas, liquid-gas, and solid-solid phase transitions, and are widely used in HVAC, energy-saving buildings, solar energy utilization, clothing and other fields , Is of great significance in terms o...

AI Technical Summary

Problems solved by technology

Although supercooled crystallization is a common phenomenon in the cooling process of PCM, the supercooled crystallization of PCM in MicroPCMs and NanoPCMs makes the exothermic process occur at a wider temperature range or lower temperature, which seriously affects the energy storage function.

In order to effectively eliminate or reduce the supercooled crystallinity, the inventors studied (see Colloid and Surface Science Journal, Journal of Colloid and Interface Science, 2005, 281 (2): 299-306) the mass fraction of 5-30% Effects of 1-tetradecyl alcohol, 1-stearyl alcohol and paraffin wax with a melting point of 56°C on the supercooled crystallization of n-octadecane in MicroPCMs. As an anti-supercooled crystallization additive, 1-octadecyl alcohol cannot be achieved because it affects cystic formation. to the best effect; when the paraffin mass fraction was 20%, MicroPCMs with lower degree of supercooled crystallization and better encapsulation could be prepared, but the effective content of n-octadecane in MicroPCMs was reduced, and the diameter of MicroPCMs increased The smaller the paraffin, the worse the anti-supercooled crystallization effect

[0004] Other researchers (see Journal of Thermal Analysis and Calorimetry, Journal of Thermal Analysis and Calorimetry, 2006, 86(2): 505-509) added modifiers such as nano-silica to MicroPCMs in an attempt to prevent them from overcooling Crystallization occurs, but results are not ideal