HP（DMDAAC／AM）对MMA－膨润土泥浆体系的稀释作用

THE THINNING EFFECT OF HP(DMDAAC-AM) ON MMH-BENTONITE MUD

研究了二甲基二烯丙基氯化铵－丙烯酰胺共聚物的水解产物ＨＰ（ＤＭＤＡＡＣ／ＡＭ）对混合金属层状氢氧化物ＭＭＨ－膨润土泥浆体系的稀释作用。通过电性、流变性、滤失性、抑制性及粒度分布的研究，发现ＨＰ（ＤＭＤＡＡＣ／ＡＭ）对ＭＭＡ－膨润土泥浆有较强的稀释能力和一定的降失水作用；含ＨＰ（ＤＭＤＡＡＣ／ＡＭ）的ＭＭＡ－膨润土泥浆对粘土膨胀有很好的抑制性。ＨＰ（ＤＭＤＡＡＣ／ＡＭ）分子在粘土颗粒表面产生多点静电强吸附，破坏了ＭＭＨ与粘土颗粒形成的网状结构．释放出自由水，从而达到稀释效果。

The thinning effect of hydrolyzed DMDAAC-AM copolymer.HP(DMDAAC-AM),on MMH-bentonite mud has been experimentally studied through measurements of rheological characteristics and fluid loss of the mud, zeta-potential on bentonite particle, size distribution and bentonite expansion in the filtrate. It is shown that both the thinning and inhibitory capacities of HP(DMDMC-AM) for the mud are good. The strong thinning effect is believed to be related to the synergetic cationic, anionic and nonionic functional groups in HP (DMDAAC-AM) molecules. The thinning mechanizms are discussed.