共查询到19条相似文献,搜索用时 234 毫秒
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以过硫酸铵-亚硫酸氢钠为氧化还原引发体系、亚硫酸氢钠同时作链转移剂合成低相对分子量的聚丙烯酸钠,作为一种油田防垢剂。研究了单体、引发剂及链转移剂的用量、反应温度和时间等对产物相对分子质量的影响,并对不同相对分子量的产物进行了防垢性能的评价。结果表明反应温度为60℃、单体质量分数30%、引发剂用量0.6%、链转移剂用量5%、反应时间2 h时,可制得聚丙烯酸钠的粘均相对分子质量在2 000~3 000,作为油田防垢剂防垢效率高、效果好。 相似文献
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以H2O2-NaHSO3为引发剂,在超声波辅助下引发丙烯酸单体聚合,研究了单体浓度、引发剂用量、反应温度等对单体转化率和聚丙烯酸钠分子量的影响。结果表明:控制单体浓度30%、引发剂用量4.0%、反应温度60℃,可制得聚丙烯酸钠的相对分子量在2000~3000之间。 相似文献
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以丙烯酸为单体,采用过硫酸铵和亚硫酸氢钠为氧化还原引发剂,同时亚硫酸氢钠又作为链转移剂来制备低分子量的聚丙烯酸钠.研究了单体浓度、引发剂用量、链转移剂用量以及反应温度对分子量和分散性的影响.通过正交设计实验确定了最佳反应条件:过硫酸铵用量为5.56%,亚硫酸氢钠为4.44%,单体浓度为33.3%,温度70℃,反应时间为3h. 相似文献
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制备聚丙烯酸钠分散剂的最佳工艺条件探究 总被引:1,自引:0,他引:1
以丙烯酸为单体,采用过硫酸铵和亚硫酸氢钠为氧化还原引发剂,同时亚硫酸氢钠又作为链转移剂来制备低分子量的聚丙烯酸钠.研究了单体浓度、引发剂用量、链转移剂用量以及反应温度对分子量和分散性的影响.通过正交设计实验确定了最佳反应条件过硫酸铵用量为5.56%,亚硫酸氢钠为4.44%,单体浓度为33.3%,温度70℃,反应时间为3h. 相似文献
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以丙烯酸为单体,采用过硫酸铵和亚硫酸氢钠为氧化还原引发剂,同时亚硫酸氢钠又作为链转移剂来制备低分子量的聚丙烯酸钠。研究了单体浓度、引发剂用量、链转移剂用量以及反应温度对分子量和分散性的影响。通过正交设计实验确定了最佳反应条件:过硫酸铵用量为 5 56%,亚硫酸氢钠为 4 44%,单体浓度为 33 3%,温度 70℃,反应时间为 3h。 相似文献
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水溶性聚丙烯酸钠的合成及其应用 总被引:2,自引:0,他引:2
聚丙烯酸钠是近年来国内外广泛研究开发的精细化工产品之一,不同分子量的聚丙烯酸钠具有不同的作用。简述了水溶性聚丙烯酸钠的合成方法,并对不同分子量的聚丙烯酸钠的性能和应用进行了阐述。 相似文献
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低分子量聚丙烯酸钠的制备及应用进展 总被引:3,自引:0,他引:3
综述了低分子量聚丙烯酸钠的制备方法,介绍了它在工业中的应用,并结合目前国内的发展状况,对今后我国聚丙烯酸钠的研制和发展作出展望。 相似文献
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采用水溶性偶氮引发剂V50和NaHSO3组成的复合引发剂,通过反相乳液聚合制备了相对分子质量高的聚丙烯酸钠。研究了引发剂种类及用量、乳化剂的HLB值及其用量、反应温度等因素对聚丙烯酸钠相对分子质量的影响规律。并采用正交优化方法对聚丙烯酸钠的聚合反应工艺进行优化研究。结果表明:复合引发剂V50/NaHS03效果优于APS/NaHSO3。最佳聚合工艺条件为复合乳化剂的用量为9%(占油相的质量百分数)、其HLB值为5.7、单体中和度为90%、引发剂用量为2.0%(占单体的质量百分数)、反应温度为40°C。在最佳反应条件下,得到的聚合物相对分子质量可达到2.1×107,溶解时间23 min(0.3 g/100 g H2O,45°C)。 相似文献
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In this work, we examine the effect of small additions of cationic quaternary ammonium salts (QAS) of different molecular weight on the rheology of an industrial ceramic suspension deflocculated with sodium polyacrylate and sodium metasilicate. The observed shear thinning behaviors obey the typical power law of fluid rheology. In order to characterize the rheological behavior of these slurries, three new parameters are introduced: a low shear rate consistency index and two transient viscosities, distant from the equilibrium, after increasing and decreasing the shear rates. These parameters vary with polyacrylate molecular weight and on additions of small quantities of QAS, which we found to be useful for decreasing the slurry viscosity. 相似文献
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Distillation of sea water and other naturally occurring saline waters gives rise to the formation of scale deposits, causing a reduction in capacity or efficiency, or both.Several methods suggested to reduce the amount of potential scale have met with only partial success. Recently, it was found that the addition of small amounts of polymeric materials of selected molecular weight range to the sea water feed, had a remarkable effect in reducing the adverse effects of scale formation on the heat transfer surfaces.The work reported here was carried out in an attempt to establish the optimum dosage of these organic polymers (sodium polyacrylate and sodium polymethacrylate)in saline water feed, by experiments with a single effect evaporator.For batch type operations, using a synthetic sea water of 7,000 ppm total hardness as CaCO3 and a pH of 7.5, sodium polyacrylate at a 4 ppm concentration, gave 98% scale reduction. Molecular weight of the polymer being tested was 125,000. Similar experiments with sodium polymethacrylate, molecular weight 8,000 to 10,000, with rather concentrated feed (10,400 ppm total hardness) indicated it to be effective at 100 ppm concentration. Scale reduction in this case was 92%.Three different molecular weights of each polymer were investigated for their effectiveness. Sodium polymethacrylate, having a molecular weight of 4,500, was found to be most effective as a scale preventive additive. In the case of sodium polyacrylate, both a lower molecular weight of 84,500 and a higher one of 190,000 were found to be almost equally effective. However, a molecular weight of 125,000 gave very poor results. Scale reduction was found to be only 17.1%, as compared to 69.2%, obtained with the other homologue. 相似文献
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