Preparation method of paraffin phase-change microcapsule

Abstract

The invention provides a preparation method of a paraffin phase-change microcapsule applicable to the phase change energy storage field. The preparation method comprises the following steps: preparinga melamine modified urea resin prepolymer solution; adding paraffin and an emulsifier solution into the prepolymer solution, so as to obtain a paraffin emulsion; and adjusting the pH value of the paraffin emulsion to 3, and stirring at a constant temperature to generate in situ polymerization, so as to obtain the paraffin phase-change microcapsule adopting melamine modified urea resin as a wall material. The paraffin phase-change microcapsule prepared by virtue of the preparation method has the advantages of small particle size, excellent phase-change performance, good stability and the likeand can be directly applied to the fields of building thermal insulation, solar drying, textiles and the like.

Description

technical field [0001] The invention relates to the field of phase change energy storage, in particular to a preparation method of paraffin phase change microcapsules. Background technique: [0002] Phase change energy storage means that during the phase transition of phase change materials, heat is absorbed or released in the form of latent heat, and a large amount of heat is stored or released within a small temperature range. The use of microcapsule technology to coat paraffin can change the problems of poor stability, easy leakage, and easy penetration of paraffin. [0003] Paraffin wax has become a commonly used phase change energy storage material because of its good heat storage performance, no supercooling, phase separation, and corrosiveness. However, it is not easy to microencapsulate paraffin wax, mainly because the pH value of the system is not easy to control during the microcapsule forming process. If the pH value is too high, the shell strength of the formed...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a method capable of preparing paraffin phase-change microcapsules with smaller particle size and good stability and using melamine-modified urea-formaldehyde resin as the wall material, so as to solve the problems of poor stability and easy leakage of paraffin wax and the existing Technical Problems of Poor Water Resistance of Capsule Shell in Paraffin Microencapsulation Technology