摘要：用自制的含氮长链硼酸酯偶联剂对水镁石粉体进行表面改性,利用红外光谱、X射线衍射和扫描电镜对改性前后的水镁石粉体进行表征。结果表明,经过改性的水镁石粉体的活化指数可达96.7%,吸油值从未改性前的1.190 40 mL/g减小为0.392 90 mL/g;经硼酸酯偶联剂改性后,水镁石粒子表面极性降低,分散性提高,同时偶联剂吸附在水镁石颗粒表面。

关键词：水镁石；表面改性；硼酸酯；偶联剂

Abstract：The brucite powders were modified by the long-chain nitrogen containing borate ester coupling agent.The unmodified and modified brucite powders were characterized by IR,XRD and SEM.The results indicate that the activation index of modified brucite powders can reach 96.7%.The oil absorptivity is reduced from 1.190 40 to 0.392 90 mL/g after 2 h.The particle polarity of modified brucite is reduced and dispersion of powders is improved.The coupling is attached on the surface of brucite particles.

Keywords：brucite;surface modification;borate ester;coupling agent