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为了促进层间阳离子交换,将原始蒙脱土进行超细化和接枝处理后以超临界二氧化碳(sc SO2)为介质、以十四烷基三己基氯化鏻(TTPC)为插层剂对其进行插层改性。结果表明:经sc CO2处理后蒙脱土的亲水性减弱,颗粒变得蓬松,且随着压力从10 MPa提高到20 MPa再至30 MPa,TTPC在sc CO2中的溶解度先增加后降低,20 MPa时达到饱和,在该压力下制备的有机超细蒙脱土FTIR曲线中2 927 cm-1和2 855 cm-1的-CH2不对称和对称伸缩振动峰峰强最强,TG曲线中200~550℃的热失重率最高,(001)衍射面对应的衍射角最小,蒙脱土片层间距最大,制备的改性蒙脱土颗粒最蓬松。
In order to promote interlayer cation exchange, the original montmorillonite was ultrafine and grafted, then treated with supercritical carbon dioxide (sc SO2) and tetramethyltrihexylphosphonium chloride (TTPC) as intercalation agent Its intercalation modification. The results showed that the hydrophilicity of montmorillonite decreased and the particles became fluffy after sc CO 2 treatment. The solubility of TTPC in scCO 2 increased first and then decreased with the increase of pressure from 10 MPa to 20 MPa and then to 30 MPa. 20 MPa, the peak intensities of asymmetric and symmetrical stretching vibration of -CH2 at 2 927 cm-1 and 2 855 cm-1 in the FTIR curve of organic ultrafine montmorillonite prepared under this pressure are the strongest. In the TG curve The highest weight loss at 200 ~ 550 ℃, the diffraction angle corresponding to the (001) diffraction plane is the smallest, and the interlayer spacing of montmorillonite is the largest. The modified montmorillonite particles are the most bulky.