铵基蒙皂石的合成及其应用

Synthesis of Ammonium-saponite and Its Application

研究了合成时间、成分配方对铵基蒙皂石合成的影响。对样品进行了XRD、SEM、pH值、CEC、化学成分、矿物类型、铵基蒙皂石含量分析。结果表明,随合成时间延长,铵基蒙皂石结晶程度趋于完善;较高的NH4+与Al摩尔比有利于铵基蒙皂石的结晶,较低的NH4+与Al摩尔比有拜耳石产生,在1 h之后消失;在合成的1 h内pH值下降较快,之后下降变缓至趋于稳定值;NH4+-CEC在4 h内增大较快,之后趋于稳定值;合成铵基蒙皂石的SEM图像呈朵状和弯曲片状集合体;合成时间为4h时,WB2-5样品蒙皂石含量最高为99.7%,可作为应用合成的参考配方和工艺条件;应用试验表明,合成铵基蒙皂石与羧甲基纤维素(CMC)配伍后可以很好地改善牙膏的膏体性能。

The effects of reaction time and starting chemical burden on the synthesis of ammonium-saponite are investigated.The samples were characterized by XRD, SEM, pH, CEC, chemical compositions, mineral kind and content of the saponite analyses. The results show that the crystallinity of the the saponite grow better with increasing reaction time. A higher NH4＋ and A1 molar ratios facilitate the crystallization of the saponite. A few of bayerite form at law NH4＋ and A1 molar ratios, after 1 h, they disappear. The pH decreases rapidly within first 1 h, then drops slowly to the constant. During the first 4h, NH4＋-CEC increases strongly, then to the constant. The SEM images of the saponite are winding sheets.The saponite content of WB2-5 samples is a maximium of 99.7% at 4 h, its chemical burden and technology can be used in the industrial synthesis of saponite. A crystallization model of ammonium-saponite is proposed with the researched data. The quality of toothpaste can be improved greatly by mixing ammonium-saponite with CMC.