PROCESS FOR PREPARING PHASE CHANGE MICROCAPSULE HAVING THERMALLY CONDUCTIVE SHELL

摘要

A process for preparing a phase change microcapsule having a thermally conductive shell is introduced. The thermal conductivity of the encapsulation materials for the phase change microcapsules is increased by adding thermally conductive nano-materials. The vinylsilane compound is polymerized with the acrylic monomer to form the copolymer first, and then the thermally conductive inorganic material is added. Thereafter, the phase change microcapsule having the phase change material as the core and the thermally conductive material-containing copolymer as the shell is prepared. The polar functional groups on the surface of the thermally conductive inorganic material condense with the vinylsilane compound to form chemical bonding, thereby substantially increasing the compatibility between the thermally conductive inorganic material and the copolymer. Therefore, the thermally conductive material can be dispersed stably during the encapsulation of the microcapsules, and the phase change microcapsule having the thermally conductive shell can be obtained successfully.

主权项

1. A process for preparing a phase change microcapsule having a thermally conductive shell, comprising the steps of:
(A) providing a vinylsilane compound; (B) adding to the vinylsilane compound an acrylic monomer and a trace amount of initiator-benzoyl peroxide, which are stirred and heated in a oil bath to carry out a prepolymerization reaction and form a first solution; (C) adding a phase change material to a polyvinyl alcohol solution, which is then heated up to a temperature above the melting point of the phase change material to perform liquefaction and stirred uniformly, thereby forming a second solution; (D) adding the second solution to the first solution and stirring uniformly; and (E) adding ethylene glycol dimethacrylate and inorganic nano-powder and then adding the initiator-benzoyl peroxide to carry out the polymerization encapsulation of the microcapsule by being heated in a stirred oil bath and obtain the phase change microcapsule having the thermally conductive shell wherein the inorganic nano-powder is selected from aluminum oxide, aluminum nitride, boron nitride, silicon carbide, or combinations thereof; wherein the phase change microcapsule is a core-shell material, of which the shell material is a copolymer of the vinvlsilane compound and the acrylic monomer; wherein the equivalent proportion of the acrylic monomer to the vinylsilane compound is from 10:1 to 10:3; wherein the acrylic monomer is methyl acrylate, methyl methacrylate, or hydroxyethyl methacrylate.