己内酰胺复配异氰酸酯改性蒙脱土的制备与表征

Preparation and Characterization of Caprolactam Compounding Isocyanate Modified Montmorillonite

以己内酰胺(CL)为插层剂,二苯基甲烷-4,4'-二异氰酸酯(MDI)为改性剂,制备己内酰胺复配异氰酸酯改性钠基蒙脱土(Na-MMT)。将复配改性制得的有机蒙脱土再与Na-MMT、己内酰胺插层的Na-MMT和异氰酸酯(MDI)改性的Na-MMT进行对比研究。利用电感耦合等离子体发射光谱(ICP-OES)、能量色散偏振X射线荧光光谱仪(XRF)、红外光谱(FTIR)、热重分析(TG)和电子显微镜(TEM)对改性前后的Na-MMT进行表征。结果表明,己内酰胺能进入水溶胀的Na-MMT层间,但对层间阳离子(Na+)含量影响不大;MDI能与MMT外表面和端面吸附的水反应生产取代脲对MMT进行有机包覆,而对MMT的分散和层间阳离子含量影响不大;只有己内酰胺复配MDI改性的MMT,其层间阳离子含量显著降低,且微观上呈纳米级分散。

Sodium montmorillonite （Na-MMT） was modified by isocyanate compound caprolactam, with caprolactam （CL） as the intercalating agent, 4, 4＇diphenyl methane diisocyanate （MDI） as a modifier, then comparative studies were made in organic montmorillonite modified compound, Na-MMT, Na- MMT intercalated by caprolactam, and Na-MMT modified isocyanate （MDI）. The unmodified and modified Na-MMT were characterized by inductively coupled plasma atomic emission spectrometry （ICP-OES） , energy dispersive X-ray fluorescence polarization spectroscopy （ XRF）, FTIR, TG and TEM. The results showed that caprolactam can intercalate into interlaminations of Na-MMT swollen in water, and had little effect on the content of the interlayer cations （ Na ^＋ ）. MDI can react with water that was adsorbed in external and end surface of MMT to product earbamide to coat MMT organically, and had little impact on the dispersion of MMT and interlayer cation content. nanoscale, and the content of cation Only MMT modified by caprolactam in interlayers decreased significantly. compound MDI were dispersed in