Preparation method and application of modified composite phase change wax

Abstract

The application discloses a preparation method and application of modified composite phase change wax, which is prepared by interface cross-linking of functionalized phase change wax and composite carrier through a coupling agent; the functionalized phase change wax is obtained by modifying a wax system through an initiator and an organic acid anhydride, and the composite carrier is prepared by acidizing, swelling and sol-gel of two or more porous carriers, wherein the types of the wax in the wax system are two or more, the difference between the melting points of different waxes in the wax system is less than 10 DEG C, the difference between the maximum pore diameter and the minimum pore diameter of different carriers in the porous carrier ranges from 45 nm to 54 nm, and the difference between BET is greater than 300 m2 / g, so that a modified composite phase change wax with high thermal conductivity, excellent shape stability and good cycle performance can be obtained through a triple synergistic strategy of "synergistic modification + double-carrier compounding + directional connection" and parameter optimization of a reaction process.