二氧化锰混合体系在聚硫密封剂中的应用

Application of manganese dioxide mixed system in polysulfide sealant

通过水热合成法制备出3种不同晶型的二氧化锰,通过X射线衍射(XRD)和扫描电镜(SEM),最终分别确定δ-MnO_(2),γ-MnO_(2)和α-MnO_(2)这三种晶型。利用非介入式材料均质机进行物理混合制备了一系列二氧化锰混合体系。探究不同晶型二氧化锰、不同二氧化锰混合体系对聚硫密封剂的硫化性能和力学性能的影响。研究表明,用δ-MnO_(2)作为硫化剂硫化后的聚硫密封剂具有更好的力学性能。在不同混合体系中,δ-MnO_(2)和Mn_(2)O_(3)定量存在有助于聚硫密封剂的硫化,有利于提高聚硫密封剂的力学性能。

Three different crystalline forms of manganese dioxide were prepared by hydrothermal synthesis,and the three crystalline forms ofδ-MnO_(2),γ-MnO_(2)andα-MnO_(2)were finally determined by X-ray diffraction(XRD)and scanning electron microscopy(SEM).A series of manganese dioxide hybrid systems were prepared by physical mixing using a non-invasive material homogenizer.The effects of different crystalline manganese dioxide and different manganese dioxide blending systems on the vulcanization properties and mechanical properties of polysulfide sealants were investigated.The study showed that the polysulfide sealants vulcanized withδ-MnO_(2)as vulcanizing agent had better mechanical properties.The quantitative presence ofδ-MnO_(2)and trivalent manganese in different mixing systems contributes to the vulcanization of polysulfide sealants and is beneficial to improve the mechanical properties of polysulfide sealants.