有机蒙脱土改性遇水膨胀橡胶耐久性研究
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摘要
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)。采用XRD表征了OMMT改性WSR的结构,通过热氧老化试验和反复浸水试验,研究了OMMT对WSR耐久性的影响。结果表明,OMMT和WSR形成了剥离型纳米复合结构;与普通WSR相比,OMMT改性WSR在热氧老化和反复浸水试验后的拉伸强度保留率、扯断伸长率保留率和体积膨胀倍率保留率均有显著提高,这可归因于OMMT改性WSR形成的剥离型纳米复合结构具有优良的气液阻隔性能。
Modified water swelling rubber(MWSR) was prepared by melt blending with natural rubber,crosslinked sodinm polyacrylate and organic montmorillonite(OMMT).The structure of MWSR was characterized by the X-ray diffraction(XRD).The effect of OMMT on durability of MWSR was investigated by thermal aging test and repeated water immersion test.Results showed that the exfoliated nanocomposites were formed in the MWSR.The retention rate of tensile strength,elongation at break and volume expansion ratio of WSR were improved significantly due to introduction of OMMT,which can be attributed to the excellent barrier ability to gas and solution of the exfoliated structure formed in the MWSR.
Modified water swelling rubber(MWSR) was prepared by melt blending with natural rubber,crosslinked sodinm polyacrylate and organic montmorillonite(OMMT).The structure of MWSR was characterized by the X-ray diffraction(XRD).The effect of OMMT on durability of MWSR was investigated by thermal aging test and repeated water immersion test.Results showed that the exfoliated nanocomposites were formed in the MWSR.The retention rate of tensile strength,elongation at break and volume expansion ratio of WSR were improved significantly due to introduction of OMMT,which can be attributed to the excellent barrier ability to gas and solution of the exfoliated structure formed in the MWSR.
引文
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[15]Kim J K,Hu C G,Woo R S C,et al.Moisture Barrier Characteristics of Organoclay-epoxy Nanocomposites[J].CompositesScience and Technology,2005,65:805-813.
[2]刘岚,向洁,罗远芳,等.吸水膨胀橡胶的研究进展[J].高分子通报,2006(9):23-29.
[3]张惠峰,王益庆,吴友平,等.粘土/橡胶纳米复合材料老化性能研究[J].橡胶工业,2004,51(8):453-459.
[4]陈经盛.橡胶老化防护与监测(一)[J].化工标准化与质量监督,1996(1):30-34.
[5]王思静,熊金平,左禹.橡胶老化特征及防护技术研究进展[J].合成材料老化与应用,2009,38(3):41-46.
[6]杨清芝.现代橡胶工艺学[M].北京:中国石化出版社,1997.
[7]肖淡,魏伯荣,杜茂平.橡胶加速老化试验及贮存期推算方法[J].合成材料老化与应用,2007,36(1):40-43.
[8]李昂.橡胶的老化现象及其老化机理[J].特种橡胶制品,2009,30(5):56-66.
[9]朱祖熹,陆明.遇水膨胀类止水材料的性能及其应用技术(上)[J].中国建筑防水,1999(5):5-14.
[10]Yamaji I sao.The Development of Water Swelling Rubbers and Their Component[J].Polymer Digest,1984,36(10):17-25.
[11]肖建斌,王永祥.NR/SBR吸水膨胀橡胶的性能研究[J].青岛科技大学学报,2004,25(6):507-509.
[12]冯东东,何培新.共混型吸水膨胀橡胶的研究及应用[J].特种橡胶制品,2001,22(2):46-49.
[13]李培耀,宋国君,亓峰,等.天然橡胶/有机蒙脱土纳米复合材料的阻隔效应[J].合成橡胶工业,2008,31(4):290-293.
[14]Gorrasi G,Tortora M,Vittoria V,et al.Vapor Barrier Properties of Polycaprolactone Montmorillonite Nanocomposites:Effect of Clay Dispersion[J].Polymer,2003,44:2271-2279.
[15]Kim J K,Hu C G,Woo R S C,et al.Moisture Barrier Characteristics of Organoclay-epoxy Nanocomposites[J].CompositesScience and Technology,2005,65:805-813.