Preparation method of microencapsulated stabilized phase-change material

Abstract

The invention relates to a preparation method of a microencapsulated stabilized phase-change material and belongs to the technical field of phase-change materials. The preparation method comprises the following steps: firstly, taking soap stock as a raw material; carrying out saponification and acidolysis to obtain fatty acid; mixing the fatty acid with paraffin wax to obtain a phase-change material, wherein the fatty acid can be used for reducing the melting point of the paraffin wax; inserting an ethylene monomer into a graphite flake layer; polymerizing to separate the graphite flake layer; doping graphite into a polymer so as to increase the thermal conductivity of the polymer; carrying out emulsion reaction to coat the phase-change material with the polymer; taking tetraethyl orthosilicate as a raw material and depositing silicon dioxide on the surface of the polymer under the action of alkali to form a coating film; finally, drying to obtain the microencapsulated stabilized phase-change material. The microencapsulated stabilized phase-change material prepared by the preparation method has an excellent heat-conducting performance, the phase change enthalpy reaches 130.14kJ/kg to 135.25kJ/kg and the phase change temperature is 20 DEG C to 40 DEG C; the microencapsulated stabilized phase-change material has good compatibility with a building material and related mechanical properties of the building material are not influenced; the microencapsulated stabilized phase-change material has wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a microencapsulated and shaped phase-change material, and belongs to the technical field of phase-change material preparation. Background technique [0002] In my country, buildings have gradually become one of the main energy consumption. Building energy consumption currently accounts for about 25% of the total energy consumption of the national economy, and it is showing an increasing trend. According to tests, about 50% of the total energy consumption of buildings is caused by walls. of. Although the widely used external wall insulation and internal wall insulation technology can reduce energy consumption, due to the limited heat capacity of the material itself, the energy cannot be fully stored and utilized, thus limiting the energy saving capacity of the building. Phase change materials are environmentally friendly and energy-saving intelligent materials with broad application prospects. It has uni...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the problems that the traditional stereotyped phase change materials have relatively poor thermal conductivity, resulting in insufficient heat absorption and release, and poor compatibility with building materials, a phase change material using fatty acid and paraffin wax is provided. , after microencapsulation by graphite-doped polyethylene coating, and then further coating with silicon dioxide to prepare the microencapsulated stereotyped phase change material, the present invention first uses soapstock as raw material, undergoes saponification, acidolysis Finally, fatty acid is obtained, and then mixed with paraffin to obtain a phase change material. Fatty acid can reduce the melting point of paraffin, and then insert vinyl monomer into graphite sheet,...