Silane coupling agent modified silicon dioxide phase change microcapsule and preparation method thereof

Abstract

The invention discloses a silane coupling agent modified silicon dioxide phase change microcapsule and a preparation method thereof, wherein the phase change microcapsule is prepared by using silane coupling agent modified silicon dioxide as a wall material and using an organic phase change material as a core material through a sol-gel method. According to the invention, the organic group modifiedsilicon dioxide precursor is grafted and introduced by using the silane coupling agent to regulate the polycondensation reaction rate, so that the phenomena of uneven wall material thickness and wallmaterial self-polymerization are reduced, the utilization rate of the wall material is further increased, the coating rate of the phase change microcapsules is obviously increased, and the water resistance and the toughness of the wall material are improved; and sodium silicate as the silicon dioxide precursor is cheap and easy to obtain, and the reaction has no toxicity.

Description

technical field [0001] The invention relates to a functional phase-change energy storage material, in particular to a silica phase-change microcapsule modified by a silane coupling agent and a preparation method thereof. Background technique [0002] Phase change materials refer to functional materials that can store energy through the process of absorbing and releasing heat during the phase change process at a certain temperature range. In recent years, in order to achieve the purpose of energy saving and energy storage, researchers have invested a lot of time, manpower and material resources in the direction of phase change materials. Among them, phase change microcapsule is a kind of phase change energy storage material with encapsulation function. It has the advantages of stable properties and anti-leakage; it can also increase the heat conduction area through microencapsulation and improve the heat transfer rate. The application of phase change microcapsules can effec...

AI Technical Summary

Problems solved by technology

However, the rate of hydrolysis and polycondensation of sodium silicate is poorly controllable, and the industrial production of sodium silicate as a silicon source is often complicated.

During the preparation process, it is easy to cause uneven thickness of the shell layer of the wall material, or even self-polymerize into a solid silica ball, resulting in waste of the wall material and a decrease in the coating rate, or even coating failure

In addition, the wall material of inorganic silica has high brittleness and poor toughness, and the volume change of the core material is prone to rupture or collapse during the phase transition process. Due to the strong hydrophilicity of surface hydroxyl groups, the prepared microcapsules of inorganic silica have poor water resistance. , unmodified silica is easy to break in water and cause the core material to leak out, which is not conducive to long-term storage

Images