镁系无机发泡材料强度和孔结构调控研究  

Modulation of Strength and Pore Structure of Magnesium Inorganic Foaming Material

作　　者：左迎峰[1] 王健[1] 肖俊华[1] 李文豪 刘文杰[1] 吴义强[1] ZUO Ying feng;WANG Jian;XIAO Junhua;LI Wenhao;LIU Wenjie;WU Yiqiang(College of Materials Science d Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]中南林业科技大学材料科学与工程学院,湖南长沙410004

出　　处：《建筑材料学报》2018年第3期394-401,共8页Journal of Building Materials

基　　金：林业专利产业化引导项目(林业专利2016-11);"十二五"国家科技支撑计划项目(2012BAD24B03);国家林业公益性行业科研重大专项(201204704);湖南省科技人才计划项目(2016TP1013);湖南省科技创新平台项目(2016RS2010)

摘　　要：以镁系胶凝材料为基料,双氧水为发泡剂,二氧化锰为激发剂,硬脂酸钙为稳泡剂,聚丙烯酰胺为增稠剂,通过化学发泡法制备内部含有大量密闭气孔的镁系无机发泡材料.探讨了稳泡剂和增稠剂对镁系无机发泡材料表观密度、压缩强度、弯曲强度及孔结构的影响规律,采用X射线衍射法(XRD)对发泡材料改性前后的结晶相进行表征.结果表明:稳泡剂和增稠剂不仅影响镁系无机发泡材料的孔结构和发泡成型,对晶相结构也有较大影响;当稳泡剂硬脂酸钙添加量为7‰(质量分数,下同),增稠剂聚丙烯酰胺添加量为1.4‰时,所得镁系无机发泡材料的压缩强度和弯曲强度达到最大值,平均孔径较小,孔隙率和圆度值接近开普勒球体填充模型的理论数值;经稳泡剂和增稠剂改性的镁系无机发泡材料3相结晶XRD衍射峰强度明显减弱,5相结晶峰增强,解释了其力学强度改善的原因.Magnesium inorganic foaming materials containing a large number of closed pores inside were prepared by chemical foaming process,using magnesium based cementing material as base material,hydrogen peroxide as foaming agent,manganese dioxide as activator,calcium stearate as foam stabilizer and polyacrylamide as thickener.The effects of foam stabilizer and thickener on the apparent density,compression strength,flexural strength and pore structure of magnesium inorganic foaming materials were investigated.The crystalline phase of modified foaming materials was characterized by X-ray diffraction（XRD）.The experimental results show that the foam stabilizer and thickener not only affect the pore structure and foam formation of magnesium inorganic foaming materials,but also have a great influence on the crystal phase structure.When adding calcium stearate of 7‰（by mass）and polyacrylamide of 1.4‰（by mass）,the compressive strength and flexural strength of magnesium inorganic foaming materials reach the maximum,the average pore size is smaller,porosity and roundness values are close to the ideal model of Kepler.XRD analysis shows that phase 3 crystalline diffraction peak strength of magnesium inorganic foam material modified by stabilizer and thickener is greatly weakened,while phase 5 crystalline diffraction peak strength becomes greater,which is the reason for the improvement of mechanical strength.

关 键 词：镁系胶凝材料 发泡材料 稳泡剂 增稠剂 孔结构 

分 类 号：TB321[一般工业技术—材料科学与工程] TQ177[化学工程—硅酸盐工业]