Preparation method of hydrated inorganic salt-expanded vermiculite-paraffin-PAM composite phase change energy storage material

Abstract

The invention discloses a preparation method of a hydrated inorganic salt expanded vermiculite paraffin PAM composite phase change energy storage material. The preparation method comprises the following steps: (1) preparing hydrated inorganic salt / expanded vermiculite by a physical impregnation method; (2) preparing a paraffin / PAM emulsion; (3) adding the hydrated inorganic salt / expanded vermiculite into the paraffin / PAM emulsion to prepare the hydrated inorganic salt / expanded vermiculite with addition of the hydrated inorganic salt / expanded vermiculite paraffin / PAM shape-stabilized phase change energy storage material. The invention effectively reduces the leakage of paraffin as well, improves the encapsulation efficiency of paraffin, and further improves the phase change latent heat of the material due to the existence of the hydrated inorganic salt; more importantly, the hydrated inorganic salt is compounded into the body of the paraffin / PAM shape-stabilized phase change material, so that the supercooling degree of the hydrated inorganic salt is effectively reduced. Test results show that the composite phase change material has high latent heat of phase change, good thermal stability and cycling stability, and good application prospect.

Description

technical field [0001] The invention relates to the technical field of organic-inorganic composite energy storage materials. Specifically, it is a preparation method of a hydrated inorganic salt-expanded vermiculite-paraffin-PAM composite phase change energy storage material. Background technique [0002] As an energy-saving material, phase change materials can store and release energy during the phase change process, effectively reduce building energy consumption, and improve indoor comfort, so they have attracted more attention. As a common organic solid-liquid phase change material, paraffin has the advantages of high latent heat of phase change, wide phase change temperature, stable properties and low price, and has been widely used in many fields. Since paraffin wax has a liquid phase during the phase change process, it is usually necessary to encapsulate it with an encapsulation material to make a fixed phase change material to prevent its leakage. Expanded vermiculi...

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Problems solved by technology

But at the same time, hydrated inorganic salts tend to be supercooled during the crystallization process, which severely limits its application.

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