甲苯二异氰酸酯改性凹凸棒石的研究及结构表征

Study on Preparation and Structure Characterization of Organically Modified Attapulgite with Toluene Diisocyanate

甲苯二异氰酸酯(TDI)中高反应活性的-NCO基团很容易与凹凸棒石(ATTP)结构中的羟基(-OH)和H2O发生反应,TDI能够接枝到ATTP表面,从而使ATTP表面得到有效的有机改性。以TDI为有机改性剂,对活化后的ATTP表面进行有机改性,考察了ATTP的活化条件、反应温度、反应时间、TDI用量等因素对TDI改性ATTP反应程度的影响,得到了制备TDI/ATTP粉体的最优条件如下:ATTP在300℃下活化2 h,TDI与ATTP的质量比为0.2∶1.0,反应温度为80℃,反应时间为60 min,在此条件下TDI的反应程度可达57.80%。并通过IR表征了TDI/ATTP的结构,结果表明,TDI确实接枝到了凹凸棒石的结构中。

For the active-NCO in toluene diisocyanate（TDI） is easy to react with the-OH and H2O in the structure of attapulgite（ATTP）,TDI can be grafted onto ATTP surface,thus ATTP is effectively organically modified.With TDI as organic modifier,the activated ATTP was organically modified.The effects of activation conditions for ATTP,reaction temperature,reaction time and TDI amount on the reaction degree of TDI were investigated.The optimum preparative conditions for TDI/ATTP powder were obtained as follows：ATTP was activated at 300℃ for 2 h,mass ratio of TDI to ATTP was 0.2∶1.0,reaction temperature was 80℃,reaction time was 60 min.Under above conditions,TDI reaction degree reached 57.80%.The structure of TDI/ATTP was characterized by IR technique,and the result showed TDI did graft onto ATTP.