采用十八烷基三甲基溴化铵（STAB）对膨润土进行了有机改性并对改性膨润土球磨细小化。对制得的改性膨润土进行了扫描电镜（SEM）、傅里叶红外光谱（FT-IR）、X射线衍射（XRD）实验分析。结果表明,有机表面活性剂STAB已经进入膨润土的片层间,层间距由1.256nm增大到2.694nm;晶面间距增大的最佳实验条件为：STAB用量为40%,反应时间为4h,反应温度为75℃。通过对球磨后的改性膨润土进行SEM观察发现,球磨时间2h能使其颗粒基本达到亚微米至纳米级,粒度分布范围为100～500nm。对球磨改性膨润土与阳离子聚丙烯酰胺（CPAM）协同助留废旧瓦楞箱纸板（OCC）浆的研究发现,粒度较小、均匀性较好的球磨改性膨润土的助留效果优于CPAM/改性膨润土助留助滤体系。
Stearyltrimethyl ammonium bromide was used for organic modification of bentonite and then ball milled the modified bentonite.The organically modified bentonite was analyzed by SEM,FT-IR and XRD.The results show that the stearyltrimethyl ammonium bromide has been interalated into the layers of bentonite.The layer distance of the bentonite is increased from 1.256nm to 2.694nm.The appropriate experimental conditions of interplanar spacing increasing were the dosage of STAB 40%,reaction time 4h,temperature 75℃.The ball milled organically modified bentonite was analyzed by SEM.The results show that the particle mainly reach submicron to nanometer when ball mill 2h.The particle size distribution range is from 100 to 500nm.Ball milled organically modified bentonite/CPAM can improve retention rate of OCC pulp obviously than organically modified bentonite/CPAM because of smaller grains and better unigormity of ball milled bentonite.
参考文献
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