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初步研究固体石蜡及固体石蜡丙烯酸改性乳液的相行为,讨论固体石蜡乳液及改性乳液的温度对折射率的影响、乳化剂用量对乳液粘度的影响、温度对乳液粘度的影响及乳化时间对乳液粘度的影响。结果表明,两种乳液的折射率随温度变化不大,粘度随着乳化剂用量的增大而增大,且随着乳化时间的增加而逐渐增大。 相似文献
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亲水基团的含量和固含量对聚氨酯乳液的影响 总被引:19,自引:0,他引:19
通过嵌段聚合引入亲水基因COOH制得自乳化聚氨酯乳液。就亲水基因的含量和固含量对乳液的影响进行探讨。结果表明,亲水基团愈多,乳液粒径愈小,粘度愈大,成膜物吸水率愈高;当ωCOOH约为0.99%时,浸泡一周时失重率最小。因含量愈高,乳液粒径愈大,乳液愈不稳定,随着固含量增大,粘度先增大后减小。当ωCOOH为1.05%,固含量≤30%时,乳液稳定性好,贮存期大于一年。 相似文献
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反应型乳化剂对丙烯酸酯乳液稳定性和粘度的影响 总被引:1,自引:0,他引:1
使用反应型乳化剂烯丙氧基壬基酚聚氧乙烯(10)醚硫酸铵(DNS-86)和常规乳化剂十二烷基硫酸钠(SDS)制备丙烯酸酯乳液,研究了这两种乳化剂对乳液稳定性的影响,比较了两种乳化剂对乳液粘度的作用方式,探讨了反应型乳化剂对乳液粘度的影响机理。结果表明:与常规乳化剂SDS相比,使用反应型乳化剂DNS-86制得的乳液稳定性得到提高,当DNS-86的用量为2.0%时,乳液的稳定性最好。乳液的粘度随乳化剂用量的增大呈锯齿状增加。使用DNS-86制备的乳液粒径较大、粒径分布较窄、粘度较小。 相似文献
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一、前言在乳液聚合情况下,聚合物乳液粘度大小不是聚合物分子量高低的反映,而是乳液粒度及粒度分布的宏观表现。一般而言,聚合物乳液粒子越大,粘度越低;粒子越细,乳液粘度越高。粒度分布宽的乳液,往往比 相似文献
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采用逐步聚合方法,合成了可UV固化聚氨酯/丙烯酸酯(WPUA)乳液。探讨了制备工艺、加水分散方式、亲水扩链剂含量、中和剂及中和度等对WPUA乳液及漆膜性能的影响。结果表明,分步加料法制得的乳液粒径小、粘度高、稳定性高;随着加水速率的逐步加快,乳液外观由白色向淡蓝色逐渐转变,乳液稳定性逐步提高;乳液中亲水性扩链剂含量增加,乳液粒径减小而粘度增大;氢氧化钠、氨水和叔胺中和的乳液稳定性依次提高;三乙醇胺用作中和剂,当中和度超过100%时,乳液粘度迅速增大。 相似文献
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从聚醋酸乙烯乳液的组分、添加剂及生产工艺三方面讨论了影响乳液粘度的因素,介绍了几种生产中常用的调节乳液粘度的方法。 相似文献
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将纯丙乳液和苯丙乳液通过乳液共混制备出丙烯酸酯共混乳液,探讨了共混比例、共混温度、共混pH值和共混工艺对丙烯酸酯共混乳液的粒径及其分布的影响,并进一步研究了共混乳液粒径大小及分布对其流变性能的影响。结果表明:共混乳液为假塑性流体;随着共混比例和共混温度的升高,共混乳液粒径减小,黏度增大;随着共混pH值的升高,乳液粒径先增大后减小,黏度总体上呈增大趋势;半连续工艺制备的共混乳液粒径分布最窄、黏度最大,连续工艺制备的共混乳液粒径分布最宽、黏度最小,间歇工艺制备的共混乳液粒径分布和黏度居中。 相似文献
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以丙烯酰胺与丙烯酸钠为原料,在聚乙二醇水溶液中合成了聚丙烯酰胺(HPAM)分散液。考察了初始单体浓度、共聚单体与聚乙二醇摩尔配比、共聚单体摩尔配比、聚合反应温度、乳化剂种类以及用量对HPAM分散液稳定性以及特性粘数的影响。结果表明,共聚单体与聚乙二醇摩尔配比、聚合反应温度、乳化剂种类以及数量对合成HPAM分散液的稳定性以及HPAM特性粘数都有较大影响;初始单体浓度对HPAM分散液的稳定性影响较小,但对HPAM特性粘数有一定影响;采用Span80和Tween80复配作为乳化剂效果好,确定HPAM分散液体系的最佳HLB值为9.65。 相似文献
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粘度对表面活性剂液膜溶胀的影响 总被引:3,自引:1,他引:2
从实验和理论两方面探讨了粘度对液膜夹带溶胀及渗透溶胀的影响.当乳状液粘度超过50mPa·s时,夹带溶胀随乳状液粘度的增加而降低.膜相粘度的增加会导致渗透溶胀的减少.并提出了各粘度区估算溶胀率的数学模型,且模型值和实验数据吻合良好. 相似文献
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PHMS/VAc/NMA复合乳液流变性的研究 总被引:1,自引:1,他引:0
采用乳液聚合法制得了聚甲基氢硅氧烷(PHMS)/醋酸乙烯酯(VAc)/羟甲基丙烯酰胺(NMA)复合乳液,研究了反应温度、PHMS用量、NMA用量、乳化剂用量、引发剂用量对该乳液流变性能的影响。结果表明,PHMS/VAc/NMA复合乳液的粘度与PHMS用量、NMA用量呈正比关系,与乳化剂用量、引发剂用量、反应温度呈反比关系;且随着剪切速率的增加而降低,即该乳液呈假塑性流体的特征。 相似文献
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利用反相乳液聚合法制备了阳离子共聚物P(AM-DADMAC),考察了乳化剂、分散介质、引发剂、单体浓度等因素对乳液体系稳定性和共聚物特性粘度的影响。结果表明:以Span80和Tween80为复合乳化剂且浓度为4%、煤油为分散介质、油水体积比为0.5、Va-044为引发剂且浓度为0.08%~0.1%、水相单体浓度为45%时,反相乳液聚合体系稳定,且能得到特性粘度较大的阳离子共聚物。利用红外谱图证实了共聚物P(AM-DADMAC)的结构。电镜照片显示,胶体颗粒为球形,尺寸在1~9μm之间。 相似文献
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The effect of added solids on the rheology of oil in water emulsions was investigated. The range of the oil concentration, solids free basis, was (0-70%) and the solids volume fraction was (0-0.16). The solids mean diameter was 45 μm and it was about four times larger than the oil droplets. In the absence of added solids, non-Newtonian behaviour was observed for oil concentrations above 40%. The added solids increased the emulsion viscosity in a manner similar to the addition of solids to a homogeneous fluid. The rheological data of all the emulsion-solids mixtures investigated were correlated as relative viscosity versus solids volume fraction, where the relative viscosity is defined as the ratio of the emulsion-solids mixture viscosity to the solids-free emulsion viscosity. In the case of non-Newtonian systems, the emulsion-solids mixture viscosity and the solids-free emulsion viscosity were calculated at the same shear stress. The Barnea and Mizrahi viscosity correlation was found to fit the data well. 相似文献
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Synthesis of a Series of Anionic Surfactants Derived from NP and their Properties as Emulsifiers for Reducing Viscosity of Highly Viscous Oil via Formation of O/W Emulsions 下载免费PDF全文
Lei Bao Hanwei Wang Yongbin Wu Xingmin Li Weihong Qiao 《Journal of surfactants and detergents》2016,19(5):979-987
A series of alkyl phenol polyoxyethylene glycidyl ether (NP-n-O) and alkyl phenol polyoxyethylene ether hydroxypropyl sulfonate (NP-n-S) surfactants was synthesized to explore emulsification viscosity reduction. The optimum sulfonation conditions were obtained through orthogonal experiments, the ratio of alkyl phenol polyoxyethylene glycidyl ether and sodium bisulfite 1:1.5, 100 °C, and 6 h. The effects of concentrations of the synthesized surfactants, pH values, emulsifying temperature (40 and 60 °C) and water content on emulsification viscosity reduction and the stability of the emulsion to Venezuela’s Orinoco heavy oil were investigated. The water diversion ratio of emulsion at the reservoir temperature (55 °C) in 30 days was taken as an index, the results show that under the conditions of a temperature of 40 °C, an oil/water ratio of 7:3 and a surfactant NP-4-S concentration of 0.5 %, emulsions can be formed with a viscosity reduction rate reaching up to 99.69 % and with a water diversion ratio in 30 days reaching 9.38 %; while at 60 °C and an oil/water ratio of 7:3, at an NP-4-S concentration of 1 %, the viscosity reduction rate can reach 99.55 % and water diversion ratio is merely 4.23 % in 30 days. The mixture of NP-n-S, xanthan gum and cocamidopropyl dimethylamine oxide (CAO-30) at suitable concentration can greatly improve the emulsification viscosity reduction and emulsion stability, which gives an emulsion viscosity rate of over 98 %. Moreover, the emulsion can be stable for at least 30 days without water emerging. 相似文献