Preparation method of composite phase-change material

Abstract

The invention relates to a preparation method of a composite phase-change material, belonging to the technical field of application of a new material. In the method, nano SiO2 powder having high adsorption property and nano TiO2 powder having an infrared shielding effect are used as substrates to adsorb paraffin so as to prepare a composite phase-change energy storage material. The preparation method comprises the following steps: A. placing a phase-change material in a beaker, heating the beaker in a thermostatic water bath, adding distilled water and emulsifying agent to the phase-change material, and carrying out high-speed shearing and emulsification with a high-shear emulsifying machine; B. uniformly mixing nano SiO2 and nano TiO2, and then, heating the mixture in a beaker; and C. pouring the phase-change material obtained after emulsification in the step A into the oxide powder in the step B, uniformly mixing, drying in an oven to obtain lumpish solids, and grinding the lumpish solids into powder. The invention has the advantages of simple process and low cost, can effectively solve the problem of leakage in the solid-liquid phase change process and can greatly improve the phase-change temperature, latent heat of phase change, thermal stability and heat storage effect of phase-change materials such as paraffin and the like.

Description

technical field [0001] The invention relates to a preparation method of a composite phase change material, in particular to a composite phase change material formed of nano inorganic oxides and a phase change material and a preparation method thereof. It belongs to the technical field of new material application. Background technique [0002] With the development of society and economy, human beings' demand for energy is increasing. However, at present, the global energy shortage is increasing day by day, and at the same time, irrational use causes a lot of waste, which makes people have to study new energy-saving materials to improve energy utilization. Among them, the use of phase change materials is considered to be one of the effective methods to improve energy utilization. [0003] Phase change materials have the characteristics of high heat storage density and approximately isothermal heat storage and release process, which can achieve the purpose of energy storage a...

AI Technical Summary

Problems solved by technology

However, due to the leakage of paraffin and other solid-liquid phase transitions, it must be packaged in containers, such as the application in building energy saving, which limits its use.

In recent years, researchers have considered a variety of methods to solve this problem, such as paraffin microcapsules, gypsum-based ceramsite adsorption of paraffin, and polyolefin-coated paraffin, but most of these methods are complicated in process, harsh in preparation conditions, and high in cost. applied to actual production