摘要：纳米CaCO₃浆液中加入L-赖氨酸,在其表面引入羧基、氨基等活性基团实现表面改性,利用FTIR、XRD、SEM和TGA等手段对改性机理进行研究。结果表明:L-赖氨酸是以化学键合的形式接枝到纳米CaCO₃表面,改性后的纳米CaCO₃分散良好,晶面间距增大;L-赖氨酸接枝纳米CaCO3最佳工艺条件为:料浆CaCO₃中质量分数为8%~10%,L-赖氨酸与纳米CaCO₃质量比为0.1,改性温度70℃,时间70 min;优化工艺条件下,改性纳米CaCO₃

关键词：纳米 CaCO3；表面改性；L-赖氨酸；活化度

Abstract：By adding L-lysine amino acid in nano-sized CaCO₃ slurry, it could introduce active groups such as carboxyl and amino on the surface of nano-sized CaCO₃ particles to realize the surface modification. The mechanism of modification was studied by FTIR, XRD, SEM and TGA. Results indicate that L-lysine acid is grafted onto the surface of nano-sized CaCO₃ particles in the form of chemical. The modified nano-sized CaCO₃ particles is good in dispersion and increases interplanar distance. The optimum process conditions of L-lysine amino acid grafting nano-sized CaCO₃ particles are that the mass fraction of CaCO₃ in slurry is 8%~10%, the mass ratio of L-lysine to nano-sized CaCO₃ particles is 0.1, modification temperature is 70 ℃, time is 70 min.Under the optimized condition, the activation degree of modified nano-sizde CaCO₃ is 46.3%.

Keywords: CaCO3 nano-particles；surface modification；L-lysine amino acid；activation degree