海泡石矿物含量对海泡石／聚丙烯酸(钠)复合材料吸水保水性能的影响

Effect of Sepiolite Clay Subsidiary Amount on Properties of Sepiolite Clay/PAA Super Absorbent Composites

利用水溶液聚合法制备了海泡石粘土／聚丙烯酸（钠）高吸水保水复合材料，研究了海泡石粘土在0％～10％及20％～150％添加量范围对复合材料的吸水保水、重复吸水及抗电解质溶液性能的影响。结果表明，海泡石添加量在4％和40％～60％范围时，复合材料的吸蒸馏水倍率达到极大值。海泡石添加量大于60％时，复合材料吸水倍率急剧下降。复合材料的保水率随着海泡石添加量的增加而小幅增加；海泡石粘土添加量在40％～60％范围时，复合材料的重复吸水性能比较稳定；复合材料吸蒸馏水的倍率随各电解质溶液离子强度的升高而不断降低，且海泡石粘土添加量高的复合材料对外界溶液离子强度的敏感程度较高。

Sepiolite/PAA （PAAS） super absorbent composite was prepared using solution polymerization method. Effect of sepiolite clay content at the range of 0%- 10% and 20% --150% on water absorbency, water-holding performance, repeated water absorbency, electrolyte resistance and microstructure of the as-synthesized composite was discussed respectively. The results show that the maximum distilled water absorbency and the maximum 0.9 % saline water absorbency of composite are both received when sepiolite mineral content is equal to 4%. Sepiolite mineral/PAA （PAAS） composite reaches to the maximum distilled water absorbency （800 g/g） within the range of 40%--60%. Water absorbency of composite is declining sharply within the range of 60%- 150%. It is noticeable that water absorbency of composite containing sepiolite clay mineral is larger than that of polyacrylic acid natrium free sepiolite clay. Water holding of composite increases ratherish along with sepiolite content augmentation. Repeated water absorbency of composite is steady-going while sepiolite clay content within the range of 40% --60%. The distilled water absorbency of composite is decreased simultaneously when ionic strength of electrolyte solution enlarges. The higher the compsite with sepiolite clay content, the faster the exoteric electrolyte solutions absorbency descend.