有机膦酸对硫氧镁水泥的改性研究  

Modification Research of Organic Phosphonic Acid to Magnesium Oxysulfate Cement

作　　者：梁慧慧 李阳 杨红健[1] 刘晓莉[1] 何怡婷 张玉婷 LIANG Huihui;LI Yang;YANG Hongjian;LIU Xiaoli;HE Yiting;ZHANG Yuting(School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300400,China;Tianjin Thermal Power Designing Institute,Tianjin 300204,China)

机构地区：[1]河北工业大学化工学院,天津300400 [2]天津市热电设计院有限公司,天津300204

出　　处：《硅酸盐通报》2022年第12期4139-4146,共8页Bulletin of the Chinese Ceramic Society

基　　金：天津市科技计划(18YFCZZC00200)。

摘　　要：本文探究了两种有机膦酸对硫氧镁水泥抗压强度、耐水性能和凝结时间的影响,通过X射线衍射、同步热分析和扫描电子显微镜测试对硫氧镁水泥的物相组成及微观形貌进行表征和分析。结果表明:当氨基三亚甲基膦酸(ATMP)掺量在0.75%(质量分数,下同)时,相较空白组28 d抗压强度增加了113.99%,软化系数增加了101.86%;羟基乙叉二膦酸(HEDP)掺量为0.75%时,硫氧镁水泥表现出最佳机械强度及较高的缓凝效果,且软化系数达到0.93;两种有机膦酸进行复配(总掺量为0.75%),当m(ATMP)∶m(HEDP)为3∶1时,对硫氧镁水泥具有最佳改性效果。有机膦酸能与MgO水化过程中产生的[Mg(OH)(H_(2)O)_(x)]^(+)形成稳定的螯合物,减缓活性MgO水解为Mg(OH)_(2)的进程,从而延缓硫氧镁水泥的凝结时间,为硫氧镁水泥在实际工程中的应用提供了可行性。The effects of two kinds of organic phosphonic acids on the compressive strength, water resistance, and setting time of magnesium oxysulfate cement were explored. The phase composition and microscopic morphology of magnesium oxysulfate cement were characterized by X-ray diffraction, simultaneous thermal analysis, and scanning electron microscopy. The results show that when the content of amino trimethylene phosphonic acid(ATMP) is 0.75%(mass fraction, the same below), the 28 d compressive strength increases by 113.99%, and the softening coefficient increases by 101.86% compared with the blank group. When the content of 1-hydroxyethylidene-1,1-diphosphonic acid(HEDP) is 0.75%, the magnesium oxysulfate cement shows the best compressive strength and higher retardation effect, and the softening coefficient reaches 0.93. Compounding of two organic phosphonic acids with a total content of 0.75%, when m(ATMP) ∶m(HEDP) is 3 ∶1, it has the best modification effect on magnesium oxysulfate cement. [Mg(OH)(H_(2)O)^(x)]^(+)generated during the hydration of MgO and organic phosphonic acid form a stable chelate, which slows down the hydrolysis of active MgO to Mg(OH)_(2), thereby delaying the setting time of magnesium oxysulfate cement. The addition of organic phosphonic acid provides feasibility for the application of magnesium oxysulfate cement in practical engineering.

关 键 词：硫氧镁水泥 有机膦酸 517晶相 抗压强度 耐水性能 凝结时间 

分 类 号：TQ172[化学工程—水泥工业]