微米级交联聚丙烯酰胺微球分散体系的封堵特性

Plugging Property of Micro Crosslinked Polyacrylamide Microsphere Dispersed System

采用SEM、激光衍射分析及核孔膜过滤实验,研究了微米级交联聚丙烯酰胺(CPAM)微球分散体系的封堵性能。实验结果表明,CPAM微球分散体系比部分水解聚丙烯酰胺(HPAM)溶液更容易在核孔膜中形成吸附滞留,CPAM微球分散体系对1.2μm核孔膜的封堵程度远大于HPAM溶液。在一定的盐浓度范围内,盐浓度对CPAM微球分散体系的封堵性能影响较小;随溶胀温度的升高,CPAM微球分散体系通过核孔膜的过滤速率变化不大;CPAM微球分散体系具有很好的耐温抗盐稳定性。随CPAM微球浓度的增大,CPAM微球分散体系通过核孔膜的过滤时间显著延长,其封堵性能增强。溶胀时间对CPAM微球分散体系的封堵性能有较大影响,随溶胀时间的延长,CPAM微球分散体系的封堵能力先逐渐增强,在溶胀15 d左右时达到最大,然后逐渐减弱。

The plugging property of micro crosslinked polyacrylamide（CPAM） microsphere dispersed system was investigated by means of SEM, laser diffraction particle size analyzer and nuclear pore membrane filtration experiments. The results showed that the adsorption and detainment of CPAM microsphere dispersed system on the nuclear pore membrane were easier than those of hydrolyzed polyacrylamide（HPAM） solution. The plugging degree of the CPAM microsphere dispersed system to the 1.2 μm nuclear pore membrane was much higher than that of the HPAM solution. The plugging characteristic of the CPAM microsphere dispersed system was slightly affected by salt concentration in a certain range. The filtering rate of the CPAM microsphere dispersed system passing through the membrane kept almost unchanged along with temperature rise. The CPAM microsphere dispersed system has good temperature resistance and salt tolerance. Meanwhile, the filtration time of the CPAM microsphere dispersed system passing through the membrane increased largely with increasing the CPAM microsphere concentration, so its plugging effect was enhanced. The plugging capacity increased with swelling time at first, reached the maximum after about 15 d, and then decreased.