Preparation method of organic-inorganic composite capsule wall energy-storage microcapsule

Abstract

The invention discloses a preparation method of an organic-inorganic composite capsule wall energy-storage microcapsule. The method is as below: mixing an organic phase change material and a surface active agent, heating with stirring to obtain an even oil phase material; adding silica-containing silica sol and ethyl orthosilicate in a mass ratio of 1:1-10:1 into deionized water to prepare a water phase material; then adding an oil phase material into the water phase material, and uniformly dispersing into an emulsion; then adding polyisocyanate and a crosslinking agent, maintaining the original temperature and stirring speed, so as to obtain the microcapsule with the organic-inorganic composite capsule wall; and finally, conducting vacuum filtration, washing and drying on the obtained liquid substance to obtain the product. The phase change energy-storage microcapsule obtained by the method can be used in several fields such as building energy saving and insulation of pipeline storage tank, and the capsule wall of the microcapsule has the advantages of organic material and inorganic material and longer cycle of usage.

Description

technical field [0001] The invention relates to a preparation method of phase-change energy storage microcapsules, more specifically to a preparation method of energy storage microcapsules with organic-inorganic composite capsule walls. Background technique [0002] Phase-change energy storage microcapsules have received more attention because they can absorb, store, and emit a large amount of latent heat within the phase-change temperature range to achieve the purpose of controlling the ambient temperature and saving energy; in refrigeration and air conditioning, building energy saving, pipeline insulation , waste heat recovery and other fields have broad prospects. The phase change energy storage microcapsules are usually divided into two parts, namely the capsule wall and the nucleating substance, wherein the nucleating substance is coated in the capsule wall material. There are many materials that can be used to prepare the walls of microcapsules, mainly divided into tw...

AI Technical Summary

Problems solved by technology

Organic types include various polymers, such as melamine-formaldehyde resins, urea-formaldehyde resins, polyurethanes, and gelatin-formaldehyde resins, etc.; inorganic types are mainly silicon dioxide capsule walls produced by hydrolysis of tetraethyl orthosilicate or silica sol; and these Most of the existing capsule wall materials have certain shortcomings, such as poor thermal stability, short service life, toxic and side effects, and poor compatibility with matrix materials, etc.

[0003] CN1161364A discloses a preparation method of phase-change energy storage microcapsules using melamine resin as the capsule wall. Because the melamine resin is relatively brittle, the mechanical properties of the prepared microcapsules are poor and the service life is short

Although this method uses cheap silica sol instead of more expensive tetraethyl orthosilicate as the capsule wall material, there are still some problems, mainly because the process of hydrolyzing silica sol to form silica is demanding, which leads to the deterioration of the silica capsule wall. The thickness and size of the microcapsules are uneven, which affects the quality of the microcapsules; and silicon dioxide is an inorganic substance, and its compatibility is poor when the microcapsules are mixed and compounded with an organic matrix