Aqueous polyurethane micro-encapsulated phase change energy storage material and preparation thereof

Abstract

The invention discloses a metal ion crosslinked aqueous polyurethane microencapsulated phase change energy storage material and a preparation method thereof. The preparation method is characterized by comprising the following steps: melting a phase change energy storage material in deionized water at a temperature of between 30 and 90 DEG C, adding a nonionic surfactant which accounts for 0.5 to 10 percent of the weight of the phase change energy storage material, emulsifying under high-speed stirring, then adding aqueous polyurethane with the polyurethane content which accounts for 0.5 to 20percent of the phase change energy storage material and metal salt water solution with the metal ion weight which accounts for 0.1 to 10 percent of the polyurethane in the aqueous polyurethane, reacting for 0.5 to 4 hours, and cooling, filtering and drying to obtain a phase change energy storage material micro-capsule which takes the phase change energy storage material as a capsule core and metal ion crosslinked aqueous polyurethane as a capsule wall, wherein the weight ratio of the phase change energy storage material to the aqueous polyurethane is 0.5-20: 1. The product has the average particle size not obviously increased, good free mobility of particles and compact and even capsule wall.

Description

Technical field:

[0001] The invention belongs to the technical field of functional composite materials, in particular to a metal ion crosslinked waterborne polyurethane microencapsulated phase change energy storage material and a preparation method thereof. Background technique:

[0002] According to the Dutch "Energy Conversion and Management" (Energy Conversion and Management, 2004, 45(2): 263), microencapsulated phase change energy storage materials are solid-liquid phase change materials made of polymer materials or Inorganic compounds are coated with physical or chemical methods to make stable solid particles. Microencapsulated phase change energy storage materials can not only effectively increase the heat conduction area, reduce the reaction between phase change energy storage materials and the external environment, but also can Control the volume change of the material when the phase change occurs, and improve the leakage, phase separation, volume expansion, corrosio...