a nanotio 2 Preparation method of modified composite phase change microcapsules

Abstract

The invention discloses a preparation method for a nanometer TiO2 modified composite phase change microcapsule. The preparation method comprises the following steps: preparing a core material from n-alkane and alkyl stearate, preparing a wall material from methyl methacrylate, butyl acrylate, ethyl acrylate, a cross-linking agent and nanometer TiO2 and mixing the core material with the wall material so as to obtain an oil phase A; dissolving a reactive emulsifier in deionized water so as to prepare a water phase B; adding the oil phase A into the water phase B and carrying out ultrasonic dispersion so as to form an O / W pre-emulsion; heating the O / W pre-emulsion and adding an initiator into the O / W pre-emulsion so as to prepare a nanometer TiO2 modified composite phase change microcapsule emulsion; and subjecting the nanometer TiO2 modified composite phase change microcapsule emulsion to standing and carrying out filtering, washing and drying so as to obtain the nanometer TiO2 modified composite phase change microcapsule. According to the preparation method, under the condition of usage of reactive emulsifier, nanometer TiO2 is used to modify the wall material, so the phase change microcapsule with a small and uniform size is prepared.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of phase change microcapsules, in particular to a nano-TiO 2 A preparation method of modified composite phase-change microcapsules. Background technique [0002] Phase change materials refer to a class of substances that automatically absorb or release latent heat to the environment and adjust their own stored heat by using the phase or structure changes of the material itself within a certain temperature range, thereby achieving the regulation of the ambient temperature. Most of the existing phase change materials have the defects of high undercooling and easy phase separation, especially for solid-liquid phase change materials, which are easy to flow and leak during use. [0003] The processing method of most phase change materials is microencapsulation technology. Microcapsule coating technology is a technology that uses organic polymer materials or inorganic materials to coat pha...

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Problems solved by technology

According to current research, phase-change microcapsules with organic / inorganic composite materials as wall materials have good heat transfer, corrosion resistance, and strong firmness. Tong Xiaomei et al. (Tong Xiaomei, Zhang Min, Lei Lei, Zhang Hong, Qiu Jianhui) .Nano SiO 2 and graphite modified phase change heat storage microcapsules [J]. Chemical New Materials, 2010, 38 (09): 128-130.) Graphite and nano-SiO 2 The paraffin wax phase-change microcapsules of the modified composite organic wall material have improved thermal conductivity, but no phase-change microcapsules with nano-TiO2 modified P(MMA-EA-BA) copolymer as the wall material

At the same time, the reported synthetic method of phase change microcapsules has emulsion polymerization, but no soap-free emulsion polymerization using reactive emulsifiers has been reported.