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首页> 外文期刊>Journal of Applied Polymer Science >Modification of the Molar Anionic Charge Density of Acetone-Formaldehyde-Sulfite Dispersant to Improve Adsorption Behavior and Effectiveness in the Presence of CaAMPS (R)-co-NNDMA Cement Fluid Loss Polymer
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Modification of the Molar Anionic Charge Density of Acetone-Formaldehyde-Sulfite Dispersant to Improve Adsorption Behavior and Effectiveness in the Presence of CaAMPS (R)-co-NNDMA Cement Fluid Loss Polymer

机译：改性丙酮-甲醛-亚硫酸盐分散剂的摩尔阴离子电荷密度，以提高在CaAMPS（R）-co-NNDMA水泥失水聚合物存在下的吸附行为和有效性

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Sulfonated aldol polycondensates were synthesized from acetone, formaldehyde, and different amounts of sodium sulfite, resulting in polymers with varying degrees of sulfonation (DS). The anionic charge amount of these macromolecules measured by polyelectrolyte titration decreased with lower DS. The effectiveness of the acetone-formaldehyde-sulfite (AFS) polycondensates as cement dispersant was found to depend on the amount of polymer adsorbed oil cement. AFS adsorption decreases with lower DS. Interaction and compatibility between AFS and CaAMPS (R)-co-NNDMA fluid loss additive was studied by formulating binary additive systems composed Of one of the modified AFS polymers and CaAMPS-co-NNDMA. At high DS, AFS adsorbs strongly and prevents CaAMPS-omega-NNDMA from adsorbing in sufficient amounts on the cement surface. The result is poor fluid loss control of the cement slurry. AFS polymers with lower DS, however, allow simultaneous adsorption of both polymers in sufficient quantities to provide good fluid loss control and low rheology at the same time. Thus, effectiveness of both additives was retained. Obviously, effectiveness Of such admizture systems depends on the adjustment of the adsorption behavior of the individual components relative to each other. Molar anionic charge density of the. polymers was found to be a major parameter influencing their relative adsorption behavior. The AFS polymer with DS = 0.2 possesses a molar anionic charge density comparable to CaAMPS-co-NNDMA. Thus, when admixtures with similar molar anionic charge densities are used, the performance of one component is not negatively influenced by the Other. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2018-2024, 2009
机译：磺化的羟醛缩聚物由丙酮，甲醛和不同量的亚硫酸钠合成，得到具有不同磺化度（DS）的聚合物。随着DS的降低，通过聚电解质滴定测量的这些大分子的阴离子电荷量降低。发现丙酮-甲醛-亚硫酸盐（AFS）缩聚物作为水泥分散剂的有效性取决于聚合物吸附的油性水泥的量。 DS越低，AFS吸附量越低。通过配制由改性AFS聚合物之一和CaAMPS-co-NNDMA组成的二元添加剂体系，研究了AFS与CaAMPS（R）-co-NNDMA降滤失剂之间的相互作用和相容性。在高DS下，AFS会强烈吸附并阻止CaAMPS-omega-NNDMA足够量地吸附在水泥表面上。结果是水泥浆的失水控制不佳。但是，具有较低DS的AFS聚合物可同时吸附两种聚合物，并以足够的量同时提供良好的滤失控制和低流变性。因此，保留了两种添加剂的有效性。显然，这种掺混系统的有效性取决于各个组分相对于彼此的吸附行为的调节。摩尔阴离子电荷的密度。发现聚合物是影响其相对吸附行为的主要参数。 DS ＝ 0.2的AFS聚合物具有与CaAMPS-co-NNDMA相当的摩尔阴离子电荷密度。因此，当使用具有相似摩尔阴离子电荷密度的混合物时，一种组分的性能不会受到另一种组分的负面影响。 （c）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：2018-2024，2009

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