共查询到18条相似文献,搜索用时 234 毫秒
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以烯丙基聚氧乙烯醚(APEG-2400)、苯乙烯磺酸钠(SSS)、丙烯酸(AA)为原料,按不同比例聚合得到系列多元共聚分散剂,以此研究醚基、磺酸基、羧基这3类极性基团对分散剂性能的影响。通过红外光谱、凝胶渗透色谱仪和表面张力仪分别对聚合物的官能团、相对分子质量及其分布、表面张力等进行了表征,并探讨了不同官能团及组成比例对水性涂料用粉体的分散效果、涂料细度、粘度、热储稳定性、耐洗刷等应用的影响。结果表明,三元共聚体系下以及数均分子量在4000左右所得分散剂具有更低的表面张力(18.2 mN?m-1),对应制得的涂料具有更佳的细度(15 μm)、更好的热储稳定性(粘度变化值为3.2 cps),以及理想的耐水刷性(450—500次)。 相似文献
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本文以淀粉为原料,制备了丙烯酰胺接枝淀粉、淀粉磷酸酯、阳离子淀粉醚3种不同类型的改性淀粉絮凝剂,分别用其处理某铜矿附近河水,以固体悬浮物浓度、COD去除率、除铜率为指标,研究絮凝剂用量、pH值和温度对絮凝性能的影响。结果表明,当丙烯酰胺接枝淀粉用量为6mg/L、体系pH值为7~9、温度为25℃,淀粉磷酸酯用量为12mg/L、体系pH=7、温度为25~35℃,阳离子淀粉醚用量为14mg/L、体系pH=7、温度为25~35℃时,处理效果最佳;丙烯酰胺接枝淀粉能够起到更好的絮凝效果,阳离子淀粉醚次之,淀粉磷酸酯最弱。 相似文献
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膨润土在涂料工业中的应用 总被引:7,自引:0,他引:7
将膨润土用作106建筑涂料、仿瓷涂料、乳胶漆的填料,具有明显的增稠作用,可减少基料和颜料的用量,并有明显的降沉效果,涂料的触为性、流变性等涂刷性能得到改善,增强了涂膜的耐水性。另外,对膨润土在涂料中的作用机理作了探讨。 相似文献
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《现代矿业》2021,(6)
为了实现梅山铁矿微细粒尾矿(-400目84.61%)的高效沉降,对山东某公司絮凝剂与现场絮凝剂进行了药剂溶解难易度、药剂种类、药剂用量、加药临界点以及药剂粘度对比试验。结果表明:(1)在用量均为150 g/t的情况下,用3~#絮凝剂出现了明显的絮凝沉降效果,絮凝沉降速度较快,用1~#絮凝剂则未出现明显絮凝现象;(2)3~#絮凝剂絮凝临界点用量164.71 g/t,1~#絮凝剂絮凝临界点用量205.88 g/t,在沉降速度非常接近的情况下,3~#絮凝剂较1~#絮凝剂用量少41.17 g/t;(3)3~#絮凝剂粘度值2.9 mPa·s,1~#絮凝剂粘度值4.7 mPa·s,低粘度的3~#絮凝剂的使用有利于后续湿尾综合利用产品的脱泥脱水;(4)工业生产用量可通过工业试验确定。 相似文献
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不同水泥的增稠对比试验表明:喷射混凝土新型增稠速凝剂具有良好的增稠效果。经扫描电镜的观察分析,其增稠原理是IVA分析的吸附“架桥”和液相膜空间网络综合作用;不同水泥、不同水灰比时凝结时间测定表明IVA具有良好的速凝适应性; 强度试验证实IVA对水泥各龄斯强度发展有利;在矿山巷道的应用表明IVA能明显减少喷射混凝土回弹。图3,表4,参4。 相似文献
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《Minerals Engineering》2007,20(10):1033-1038
Viscosity measurements of polymeric flocculant solutions of poly-dimethyldiallylammonium chloride (DMDAAC) and poly-acrylamide/acrylic acid (AM/AA) families at various concentrations and solution chemistry have been carried out using the Cannon–Fenske routine viscometer. In this study, the viscosity behavior of these polymer solutions is described in terms of reduced viscosity. From the reduced viscosity-polymer concentration (ηred-C) plot, the linearity of the viscosity behavior is observed for the nonionic polymer (poly-AM). The nonlinear behavior of the ionic polymer solutions of the cationic (poly-DMDAAC) and the anionic (poly-AM/AA) obtained from this study is the result of electroviscous effects. For the cationic polymer solutions, the polymer concentration (C) and molecular weight (MW) dependence of the viscosity results mainly from the second-order electroviscous and hydrodynamic effects, respectively. Ionicity dependence of the viscosity of the anionic polymer solution may be attributed to the second-order electroviscous effect. The effect of solution pH and electrolyte addition using sodium chloride on the viscosity of charge type polymer solutions is due to the third-order electroviscous effect. The hydrodynamic and electroviscous effects will be discussed in detail. 相似文献
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钻井液类型对南极冰层取心钻进工作的影响 总被引:3,自引:1,他引:2
钻井液的类型与性能对于提高极地冰层取心钻进的效率与保证钻孔稳定性具有重要的影响。在分析铠装电动机械钻具工作原理与钻井液循环方式的基础上,较为详细地分析了升降钻具的速度与钻井液粘度与密度之间的关系;分析了现有钻井液类型和所存在的问题;以二元脂肪酸二醇酯、低分子量饱和脂肪酸酯与甲基硅油的试验测试数据为基础,确定了可用于极地冰层取心钻进的钻井液类型及其性能要求。 相似文献
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注聚井射孔孔眼附近的高速剪切会使聚合物溶液发生机械降解导致黏度损失严重,影响驱油效率。分析了聚合物溶液在射孔孔眼处的黏损机理,研究不同射孔参数对孔眼内黏度与孔眼前后黏损的影响。研究表明,孔眼内聚合物溶液的表观黏度及其对流量的敏感性随流量增大而减小;其对孔径的敏感性较射孔密度更强;在高射孔密度、大孔径下溶液黏度更高。为保持黏度的有效性,特定射孔参数下存在极限流量。孔眼处聚合物溶液黏损对不同参数的敏感性差异大,较高流变指数、射孔密度、孔径及小尺寸套管可减小黏损。运用本文的研究结果,可以合理选定射孔完井参数,进而提高聚驱效率。 相似文献
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Long chain polysaccharide polymers, such as carboxymethyl cellulose (CMC) and guar gum, are commonly used in flotation to depress gangue minerals. These depressants are in widespread use in the flotation of platinum group minerals contained in the Merensky ore body where the dominant gangue minerals are talc, pyroxene and feldspar. The molecular weight and degree of substitution of these polysaccharides are known to be significant factors influencing the behaviour of such depressants. In the present study CMC and guar at different dosages and with different average molecular weights were used to investigate their effectiveness in depressing gangue minerals. The high molecular weight depressants ranged between 600,000 and 700,000 g/mol and the low molecular weights, 40,000-70,000 g/mol. The depressants were tested using microflotation, batch flotation and equilibrium adsorption studies. The investigation showed that, at starvation dosages (100 g/t) during batch flotation, the high molecular weight polymers did not depress naturally floating gangue (NFG), whereas the low molecular weight depressants did. At higher dosages (300 g/t), both high and low molecular weight polymers depressed all NFG, without depressing sulfide recovery in the pulp. The high molecular weight polymers were significant froth destabilisers, which suggested that they were acting as good slime cleaners. This, combined with their ineffective depression of NFG at low dosages, suggested that the high molecular weight polymers were selectively adsorbing to hydrophilic gangue (pyroxene and feldspar). Adsorption isotherm experiments gave the maximum adsorption densities attainable at equilibrium. These were compared to the adsorption densities of the polymers in the microflotation and batch flotation experiments. This information showed that very little polymer was required to destabilise bubble-particle interaction during microflotation tests. At conventional plant depressant dosages of 100-300 g/t, adsorption densities range from ∼20% to 50% of maximum. 相似文献
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以烷基酚聚氧乙烯醚(APEO)为水煤浆添加剂,在不添加稳定剂的情况下,采用黏度分析法研究了烷基酚聚氧乙烯醚的成浆性能,考查了烷基酚聚氧乙烯醚对5种不同煤所制得水煤浆的分散降黏作用及分散剂用量对水煤浆表观黏度的影响。结果表明:烷基碳原子数为7、9、12、14、16、18时,几种APEO均具有不同程度的成浆能力,其中壬烷基酚聚氧乙烯醚和十二烷基酚聚氧乙烯醚的成浆性能较好;在分散剂浓度达到0.4%~0.6%时,水煤浆出现表观黏度的最低值,随着分散剂用量的增加,浆体表观黏度呈升高的趋势。 相似文献
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非开挖工程常会遇到的淤泥质高粘土土层,施工中往往需要较大的剪切力才可以破坏土体,因此常常会导致钻杆扭矩过大,导向和扩孔难以进行,造成施工困难,延误工期等后果。针对此类地层,通过室内试验研究和对分子结构的作用机理的分析,介绍了一种应用到钻井液中能有效地解决该类地层中的高扭矩问题的常见二糖有机物,并在实际工程中得到有效应用。 相似文献