Phase change energy storage capsule and preparation method thereof

Abstract

The invention provides a phase change energy storage capsule and a preparation method thereof. The capsule is formed by the interface polymerization of a polar latex and a normal-temperature (25-28DEG C) phase change material particle surface prepared in advance under the action of an additive, so the phase change material is still wrapped in the capsule after the phase change material is molten after the temperature is higher than the phase change temperature of the phase change material, and does not overflow in all directions. The normal-temperature phase change energy storage capsule prepared through the method can be combined with a building wall, and gives the temperature adjustment function to the wall through the latent heat absorption and release characteristics of the phase change material when the temperature difference between day and night is large. The phase change energy storage capsule is prepared through molding a core material and then wrapping with a wall material, so compared with other kinds of phase change capsules, the phase change energy storage capsule has the following advantages: 1, the core material is wrapped by the film of the latex, so formaldehyde and other volatile monomer substances are not contained, and the capsule is environmentally-friendly and has no pollution; 2, the particle of the capsule is in millimeter level, so the unit capacity of the core material is large, and the capsule has no super-cooling phenomenon; and 3, the flexibility of the wall material is good, so the volume of the capsule can be expanded with the liquefaction of the core material.

Description

technical field [0001] The invention relates to a building energy-saving material, in particular to a phase change energy storage capsule and a preparation method thereof. technical background [0002] The energy storage material containing phase change material (PCM) uses the temperature difference between day and night of the environment and the absorption and release of phase change latent heat to adjust the indoor air temperature, reduce the indoor temperature rise, and reduce the energy consumption of air conditioning equipment that adjusts the indoor temperature. It is an important measure of building energy saving and also the mainstream development trend in the field of building materials. Some researchers estimate that if building materials containing phase change materials can be widely used in buildings, the electricity consumption for heating and cooling of buildings can be reduced by 50%. [0003] At present, the phase change materials used in building material...

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Problems solved by technology

However, these preparation methods have the following defects: 1) the use of aldehyde resins as raw materials causes environmental pollution in preparation and products, so it is difficult to carry out actual production; 2) the particle size in the phase change microcapsules is micron, and the phase change Too little transformation material leads to high supercooling, which makes it difficult for the core material to achieve phase transition at the temperature node; 3) The volume of the core material increases by about 10% when the solid-liquid phase transition occurs, while the capsule materials of phenolic and urea-formaldehyde are hard and elastic , which seriously hinders the volume expansion of the core material, resulting in the inability to realize the phase transition smoothly.

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