共查询到20条相似文献,搜索用时 93 毫秒
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综述了非离子表面活性剂的最新研究进展。并按照化学结构将非离子表面活性剂分为聚氨酯类、聚乙二醇类、氟碳类非离子表面活性剂以及其它类非离子表面活性剂;以此对各类表面活性剂的合成进行了介绍并讨论了其结构与性能的关联。 相似文献
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综述了Hofmeister效应对离子表面活性剂、非离子表面活性剂及表面活性剂复配体系聚集性能的影响。从分子间相互作用力的角度出发,重点介绍了有机盐与无机盐影响离子型表面活性剂聚集行为的作用机制和规律,通过一些经典理论模型和方法分析了盐类对表面活性剂聚集能力影响程度不同的原因。同时,概述了表面活性剂泡沫性能与Hofmeister效应之间的关系。最后根据表面活性剂在实际应用中发挥的作用,提出了对表面活性剂Hofmeister效应的研究方向的个人看法。 相似文献
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选用复配壬基酚聚氧乙烯醚非离子表面活性剂作为生物柴油的乳化剂,考察了2种壬基酚聚氧乙烯醚m(NP-6)∶m(NP-10)、复配表面活性剂HLB值、m(油)∶m(表面活性剂)、水滴加速率以及搅拌速度等因素对纳米乳液乳化性能的影响。通过实验确定了制取纳米乳液的最佳工艺条件:m(NP-6)∶m(NP-10)=6∶4,复配表面活性剂HLB值为11.88,m(油)∶m(表面活性剂)=1.6~1.8,水滴加速率在0.7mL/min以下,以及搅拌速度为700~800r/min时,在25℃下用乳化反转点法制得稳定的水包油纳米乳,此条件下纳米乳颗粒形貌为球形,粒径分布主要在20~30nm。 相似文献
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A detailed model was developed for emulsion polymerization of styrene in batch reactor to predict the evolution of the product particle size distribution. The effect of binary surfactant systems (ionic/non-ionic surfactants) with different compositions was studied. The zero–one kinetics was employed for the nucleation rate, with the model comprising a set of rigorously developed population balance equations. The modeling incorporated particle formation by both nucleation and coagulation phenomena. The partial differential equations describing the particle population were discretized using finite volume elements. Binary surfactant systems, comprising sodium dodecyl sulfate (SDS) as anionic, and a commercial polyether polyol (Brij35®) as non-ionic surfactants, were examined with different mass ratios. Increasing non-ionic surfactant mass fraction in binary surfactant system showed the decrease of particle number due to intensifying the coagulation between particles. Broader particle size distributions with greater average particle size were obtained with non-ionic surfactant comparing those obtained with anionic one. 相似文献
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制备了预分散溶剂萃取所需的胶质液泡(CLAs),探讨了溶质的存在对CLAs稳定性的影响. 结果发现,在表面活性剂浓度相同时[离子型表面活性剂浓度为1 g/L,非离子型表面活性剂浓度为1.0%(j)],溶质(苯甲酸)的存在对CLAs稳定性的影响很大,许多在没有溶质存在的条件下能够制备得到稳定的CLAs的表面活性剂组合,在加入了溶质后,不能再制备得到稳定的CLAs. 对于在溶质存在的条件下仍能制备得到稳定的CLAs的表面活性剂组合,考察了表面活性剂浓度对所制得的CLAs平均直径的影响. 结果发现,随着离子型表面活性剂和非离子型表面活性剂浓度的增大,CLAs平均直径逐渐减小. 另外,考察了离子型表面活性剂的类型对CLAs稳定性的影响. 结果发现,当表面活性剂浓度相同时[离子型表面活性剂浓度为1 g/L,非离子型表面活性剂浓度为1.0%(φ)],阴离子表面活性剂十二烷基硫酸钠和十二烷基苯磺酸钠可制备得到稳定的CLAs,而阳离子表面活性剂十六烷基三甲基溴化铵不能制备得到稳定的CLAs. 相似文献
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松香改性非离子表面活性剂研究进展 总被引:1,自引:0,他引:1
松香是一种丰富廉价的可再生性天然资源。松香分子结构中的三环菲骨架和高级脂肪酸的长链烃基一样具有疏水基,并可通过其中的羧基、双键等活性基团引入亲水基,故松香可代替石油化工产品作为非离子表面活性剂的合成原料,符合当前绿色化学和可持续发展要求。综述了国内外松香基非离子表面活性剂的研究进展,讨论了该类非离子表面活性剂使用过程中的主要优势以及存在的问题,对该研究领域的发展前景进行了展望。 相似文献
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以聚乙烯醇/羟丙基甲基纤维素(KH20/60SH50)为主分散剂.非离子表面活性剂Span 60为助分散剂,考察氯乙烯悬浮聚合中油-水界面张力和保胶能力随非离子表面活性剂浓度的变化,发现非离子表面活性剂降低界面张力的能力和效率都强于主分散剂,但界面保胶能力不如后者;从Gibbs界面吸附公式和R值理论出发建立非离子表面活性剂、主分散剂在油-水界面上的竞争吸附模型,认为主分散剂/助分散剂混合使用时,助分散剂优先吸附于界面,在降低界面张力的同时也使分散体系保胶能力下降. 相似文献
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宜昌磷矿低温捕收剂研究 总被引:1,自引:0,他引:1
以高品位胶磷矿为研究对象,采用来源广泛且价格便宜的棉油皂脚工业品作主体药剂,在单泡管中进行了增效剂(阴离子、阳离子和非离子型表面活性剂)的筛选试验。结果表明:阴离子型表面活性剂(SDS、十二烷基磺酸钠、SDBS)的用量增加,胶磷矿的产率增加,具有良好的增效作用;非离子型表面活性剂(磷酸二(2-乙基己基)酯、吡啶)须控制用量,过量则增效作用降低。本研究还进行了验证试验,当pH=8、浮选温度为10~12℃时,SDS只需添加皂脚用量5%,精矿的回收率可提高30.68%,并能降低对温度的敏感程度,为胶磷矿低温捕收剂的进一步应用打下良好的基础。 相似文献
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非离子表面活性剂的性质及应用 总被引:9,自引:0,他引:9
非离子表面活性剂具有润湿、乳化等特性,其特性与结构类型有关.不同类型的非离子表面活性剂具有不同的性质特点.非离子表面活性剂的类型较多,应用很广,涉及到人类活动的各个领域. 相似文献
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Manuela Lechuga Alejandro Fernández-Arteaga Mercedes Fernández-Serrano Encarnación Jurado Alejandro Burgos Francisco Ríos 《Journal of surfactants and detergents》2014,17(2):363-370
This study investigated the extent of primary and final biodegradation of anionic and non-ionic surfactants to evaluate the combined use of ozonation and biodegradation in surfactant removal. The surfactants used were alkylpolyglucosides and linear alkyl benzene sulfonates. The anionic surfactant containing a benzene ring on its structure was oxidized faster than was the non-ionic surfactant. Both surfactants showed poor mineralization due to ozonation indicating an ozone attack primarily on carbon bonds. The results indicate that the removal of surfactants and of the total organic carbon is increased by the consecutive use of ozonation and biodegradation. 相似文献
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M. Gloor J. Rietktter H. C. Friederich 《European Journal of Lipid Science and Technology》1973,75(3):200-202
Defatting and Fat Regeneration of Scalp and Hair After Shampooing with Various Surfactants Defatting and fat regeneration of scalp and hair after shampooing with the anionic surfactant sodium polyethyleneglycol laurylethersulfate and the non-ionic surfactant polyoxyethylene sorbitolmonolaurate were studied on 32 subjects. The extent of defatting by the anionic surfactant was considerably higher than by the non-ionic surfactant. Two days after shampooing, three-fourth of the total lipids, taking together the lipids of scalp and hair, were regenerated. Considering the hair lipids alone, 57.77% and 64.78% of the lipids were regenerated. The initial values were attained on the fifth day. Both on the second and fifth day no significant difference in lipid content was observed for the two surfactants. These investigations fail to show that the application of a specific surfactant has any advantage in the treatment of scalp seborrhea. However, shampooing at intervals of two days appears to be meaningful. 相似文献