封闭异氰酸酯功能化石墨烯及其聚氨酯复合材料  

Blocked Isocyanate Functionalized Graphene and Its Polyurethane Composite Materials

作　　者：李晓萱[1] 梁娟[1] 伍胜利[1,2] 王忠娟[1] 

机构地区：[1]合肥工业大学化学工程学院,合肥230009 [2]安徽省食品药品检验所,合肥230051

出　　处：《聚氨酯工业》2014年第3期21-24,共4页Polyurethane Industry

基　　金：安徽省高等学校自然科学研究资助项目(KJ2012B141)

摘　　要：将甲乙酮肟(MEKO)与甲苯二异氰酸酯(TDI)进行反应,制备了半封闭TDI(b-TDI)单体,利用该b-TDI单体对氧化石墨(GO)进行处理,最后用水合肼还原得到表面含封闭NCO基团的功能化石墨烯(bi-G);将bi-G添加到由聚己二酸丁二醇酯(PBA2000)与异佛尔酮二异氰酸酯(IPDI)等制备的水性聚氨酯(WPU)预聚体中,加水分散后得到bi-G/WPU分散液。并采用红外光谱仪(FT-IR)、X射线衍射仪(XRD)、透射电镜(TEM)和热重分析(TG)对产物进行表征。结果表明,石墨成功地被氧化成氧化石墨烯,并且实现了异氰酸酯的改性,同时也表明,改性后的氧化石墨烯被充分地还原;bi-G被稳定分散到WPU胶束中;bi-G的引入明显改善了聚氨酯材料的热稳定性,特别是经过热处理后,bi-G/WPU复合材料的耐热性进一步提升。The semi-enclosed toluene diisocyanate （b-TDI） was prepaned by the reaction of methyl ethyl ketone oxime（MEKO） and toluene diisocyanate（TDI）, then, graphene oxide was treated in N, N-dimethyformamide in use of the b-TDI and finally the funetionalized graphene（hi-G） whose surface contained blocked isocyanate groups was obtained with hydrazine. Secondly, the above bi-G was added to the polyurethane prepolymer in water to prepare the polyurethane/graphene dispersion, and the polyurethane prepolymer was maked by PBA2000 and IPDI, et al. The X- Ray Diffraction （XRD）, the transmission electron microscope （TEM） and the thermal gravimetric analyzer（TG） were used to characterized the specialities of the composites. The analysis showed that the graphite was successfully oxided to graphene oxide and modified by b-TDI to obtain bi-G after reduction. The bi-G disperation was found dispersed in the aqueous polyurethane mieelles stably. Meanwhile, the TG analysis showed that the composite＇s thermal stability had significantly improved, espectionly after heat treatment, the polyuerthane/graphene composite＇s heat performance was more prominent.

关 键 词：甲苯二异氰酸酯 半封闭 石墨烯 水性聚氨酯 复合材料 

分 类 号：TQ127.11[化学工程—无机化工] TQ317