甲苯-2,4-二异氰酸酯改性蒙脱土制备方法及结构表征的研究

Study on preparation and structure characterization of organically modified montmorillonite with TDI

研究了甲苯-2,4-二异氰酸酯(TDI)分子结构中的异氰酸酯基团(─NCO)与蒙脱土(MMT)表面羟基的修饰反应,以反应程度P(TDI)为指标,考察了反应时间、反应温度、TDI的用量以及蒙脱土活化条件对改性反应程度的影响。结果表明,TDI改性蒙脱土的最佳条件为:反应时间80 min,反应温度80℃,MMT与TDI质量比为1∶0.3,蒙脱土活化条件为250℃、反应2 h,反应程度可达到34.28%。IR,XRD测试改性物TDI/MMT,结果表明,TDI与蒙脱土片层表面的羟基发生反应,引入了─NCO基团,改性后的蒙脱土的层间距较原土有所增大,从而实现了蒙脱土的有机化改性。

The modified reaction for free ─NCO group in the toluene-2,4-diisocyanate（TDI） to the hydroxyl group（─OH） of montmorillonite was investigated.According to the reaction extent（P）,the effects of reaction conditions：such as reaction time,reaction temperature,the mass of TDI and the activated condition of montmorillonite on reaction extent was discussed.The optimum modified conditions should be as follows：reaction time 80 min,reaction temperature 80 ℃,the mass ratio of montmorillonite to toluene-2,4-diisocyanate 1 ∶0.3,montmorillonite activated condition 250 ℃,2 h and the reaction extent could reach 34.28%.The modification product（TDI/MMT）was characterized by IR and XRD techniques.The results were showed that： TDI was successfully reacted with the hydroxyl group of montmorillonite layers and the free ─NCO group successfully remained on the surface of montmorillonite,also,the interlayer distance of modification product was increased further,consequently the organic modification of montmorillonite was achieved.