有机蒙脱土改性遇水膨胀橡胶耐硫化氢腐蚀性能研究

Investigation on hydrogen sulfide corrosion resistance of water swelling rubber modified by organic montmorillonite

将有机蒙脱土(OMMT)、天然橡胶和交联聚丙烯酸钠熔融混炼,制备了OMMT改性遇水膨胀橡胶(WSR)。利用XRD表征了OMMT在WSR中的分散结构,采用压差法气体渗透仪测试了OMMT改性WSR的气体渗透性,并通过力学性能测试研究了不同掺量OMMT对WSR耐H2S腐蚀性能影响。结果表明:OMMT改性WSR形成了剥离型纳米复合材料,有效降低了WSR的气体渗透系数,提高了WSR的气液阻隔性;采用OMMT改性,显著提高了WSR在H2S气体和H2S溶液中腐蚀后的拉伸强度和扯断伸长率保留率。

Water swelling rubber（WSR） was prepared by melt blending with natural rubber, crosslinked sodium polyacrylate and organic montmofillonite （OMMT）. The dispersed structure of OMMT in the WSR was characterized by X-ray diffraction （XRD）. The gas permeability and the hydrogen sulfide corrosion resistance of WSR modified by OMMT were investigated by differential- pressure method and mechanical properties test, respectively. XRD result showed that OMMT modified WSR formed an exfoliated nanoeomposite. The gas permeability coefficient of WSR was effectively decreased with introduction of OMMT,whieh indicated that gas barrier property of the WSR was improved. Both the retention rate of tensile strength and elongation at break of WSR modified by OMMT were higher than those of WSR without OMMT after being corroded by hydrogen sulfide gas and hydrogen sulfide solution.