Halogen-free flame-retardant temperature controlled microcapsules and preparation method thereof

Abstract

The invention discloses halogen-free flame-retardant temperature controlled microcapsules and a preparation method thereof. Each halogen-free flame-retardant temperature controlled microcapsule consists of a core material and a wall material, wherein the core material refers to liquid paraffin, the wall material refers to inorganic material silica, and the mass ratio of the wall material silica to the core material liquid paraffin is (1-3):1. The preparation method comprises the following steps: mixing, stirring and dissolving liquid paraffin, an emulsifier and distilled water, thereby obtaining emulsion; mixing ethyl orthosilicate, absolute ethyl alcohol and distilled water, regulating the pH value to 3-4, thereby obtaining silica-containing sol; adding the emulsion into the silica-containing sol, continuously stirring at a constant temperature for 2-3 hours, regulating the pH value to 5-6, aging at room temperature for 24 hours, stirring the obtained gel, performing suction filtration, washing, drying, thereby obtaining the halogen-free flame-retardant temperature controlled microcapsules. The halogen-free flame-retardant temperature controlled microcapsules have natural flame-retardant characteristic, and the formed microcapsules are uniform in granularity and have high conductivity and thermal stability.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant temperature-controlled microcapsule and a preparation method thereof. Background technique [0002] Phase change materials (Phase Change Materials, PCM) can be widely used in the fields of heat storage and temperature control by absorbing and releasing a large amount of heat during the phase transition process. It has been widely used in solar energy utilization, waste heat and waste heat recovery, and equipment heat dissipation. [0003] Phase change material microcapsule is a composite phase change material with a stable core-shell structure coated with a layer of stable performance on the surface of solid-liquid phase change material particles by using microcapsule technology, which solves the volume change and leakage problems when the solid-liquid phase change material phase changes , reduces the corrosion of phase change substances to equipment, improves the use efficiency of materials, bro...

AI Technical Summary

Problems solved by technology

[0004] Most of the phase change microcapsules studied are based on polymer resin as the wall material to coat the phase change material. The organic wall material itself has the disadvantage of not being flame retardant and some are even very harmful to the body.