Organic phase change microcapsule, organic phase change microcapsule composite heat dissipation material and preparation method thereof

Abstract

Firstly, the invention provides an organic phase change microcapsule. The phase change microcapsule has a core-shell structure, the core is a capsule core, and the capsule core comprises one or more components of paraffin, n-octadecane and n-tetradecane; the shell is a capsule wall and comprises a silicon dioxide component; the particle size of the phase change microcapsule is 100-200 [mu] m, thephase change enthalpy is 120-200 KJ/Kg, and the phase change temperature is 29-40 DEG C. Secondly, the invention provides an organic phase change microcapsule composite heat dissipation material whichcomprises an aluminum plastic film and the organic phase change microcapsule, and the organic phase change microcapsule is coated with the aluminum plastic film so that the unstable capsule core material can be protected from being eroded by the external environment. Finally, the invention provides a preparation method of the organic phase change microcapsule composite heat dissipation material.The preparation method sequentially comprises the following steps: preparing a water phase, preparing an oil phase, preparing an emulsion, preparing a capsule wall, carrying out spray drying, packaging with the aluminum plastic film and the like, and has the advantages of simplicity and rapidness in operation and suitability for industrial production.

Description

technical field [0001] The invention belongs to the technical field of organic phase change materials, and in particular relates to an organic phase change microcapsule, a composite heat dissipation material of the organic phase change microcapsule and a preparation method thereof. Background technique [0002] Phase change materials refer to substances that can change from one state to another under the premise of constant temperature, and absorb or release a large amount of latent heat during the phase change process, which can be divided into two categories: organic and inorganic. Phase change materials have the advantages of high energy storage density, adjustable phase change temperature, and stable performance, so they are widely used in electronic appliances, construction energy saving, waste heat recovery, aerospace, clothing fabrics and other fields. [0003] Due to problems such as easy leakage and volume expansion before and after phase change, phase change materi...

AI Technical Summary

Problems solved by technology

The prior art uses film-forming materials to coat phase-change materials to form phase-change microcapsules to solve the above problems, but existing microcapsules have disadvantages: 1. Common capsule walls are polymer materials such as melamine resin and urea-formaldehyde resin. It will release formaldehyde during use, and there is a problem that it is difficult to degrade, causing pollution to the environment; 2. Microcapsules are susceptible to external corrosion, and the thermal conductivity is not ideal; 3. The preparation method is cumbersome

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