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有机硅改性丙烯酸酯微乳液的合成与表征 总被引:2,自引:1,他引:1
采用种子乳液聚合法,以有机硅微乳液为种子乳液,在其表面进行壳聚合,合成了核壳型有机硅改性丙烯酸酯微乳液。研究了交联单体以及有机硅种子乳液用量对硅丙微乳液性能的影响,并通过红外、核磁共振及差热分析等表征了共聚物的结构。结果表明:当引发剂用量为乳液总质量的0.4%、双丙酮丙烯酰胺为交联单体且用量为乳液总质量的3%、有机硅种子乳液用量为25%时,硅丙微乳液的单体转化率达95.53%,凝胶率小,乳胶粒粒径81.2 nm;与纯丙乳液相比,成膜性更好,玻璃化转变温度低3.7℃。 相似文献
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有机硅改性丙烯酸酯共聚乳液的合成及表征 总被引:1,自引:0,他引:1
采用间歇和种子半连续乳液聚合方法合成有机硅改性丙烯酸酯(硅丙)共聚乳液,用激光粒度仪、透射电子显微镜、差示扫描量热仪、表面张力仪等分析了硅丙共聚乳液和涂层的性能。采用种子半连续乳液聚合和间歇乳液聚合均可得到具有核-壳结构的硅丙共聚乳液。半连续乳液聚合得到的硅丙共聚乳液的粒径较小,粒径分布窄;采用半连续滴加纯丙烯酸酯单体和滴加单体预乳液对共聚乳胶粒子的平均粒径及粒径分布、形态影响不大。采用间歇乳液聚合可使有机硅单体的开环聚合和丙烯酸酯单体的自由基聚合同时进行,获得的硅丙乳液稳定性好,但聚合转化率偏低,乳胶粒子粒径较大,粒径分布较宽。硅丙共聚乳液胶膜的吸水率小于纯丙烯酸酯聚合物乳液胶膜,并随有机硅共聚率的增加而降低;硅丙乳液胶膜的接触角接近有机硅接触角。硅丙共聚乳液涂层整理的织物手感优异,但涂层牢度小于纯丙乳液整理剂。 相似文献
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高性能无皂硅丙乳液合成的研究 总被引:6,自引:0,他引:6
本文在无乳化剂下合成了硅丙乳液。利用丙烯酸丁酯与甲基丙烯酸(钠)制备低聚物P(BA/MANa)代替乳化剂,由于低聚物P(BA/MANa)与合成的硅丙乳液P(BA/MMA)结构中都有PBA链段,有利于两者互容,因此,在硅丙乳液合成中虽不使用乳化剂,但乳化效果更好。研究了丙烯酸丁酯与甲基丙烯酸单体配比、pH值变化对低聚物性能的影响;研究了低聚物用量、软硬单体配比、有机硅单体种类与用量、有机硅单体(KH-570)加入方式等对合成硅丙乳液性能的影响,找出了合成无皂种子乳液与无皂硅丙乳液的最佳工艺参数,合成的无皂硅丙乳液的耐候性、耐水性等性能更加优良,硅丙乳液应用范围更加广泛。 相似文献
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有机硅氧烷对硅丙微乳液的影响(英文) 总被引:2,自引:0,他引:2
采用种子乳液聚合法引入乙烯基三异丙氧基硅烷(C-1706)改性丙烯酸酯乳液来制备高性能硅丙微乳液。着重探讨了有机硅氧烷单体及其滴加方式对乳液性能的影响,发现引入1.5%的C-1706可将乳液涂膜的硬度提高到7.3,并将其吸水率降低到4.2;且当采用硅氧烷的后滴加方式时,可有效抑制乳液聚合过程中硅氧烷的水解和缩合反应。此外,借助扫描电镜和透射电镜分析聚合产物涂膜形态和共聚乳液的粒径及其分布,结果表明改性后的硅丙微乳液的粒径可控制在50~70 nm之间,C-1706的引入可有效提高微乳液的综合性能。 相似文献
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采用种子乳液聚合法制备了聚丙烯酸丁酯(PBA)乳液,然后通过第二单体甲基丙烯酸甲酯的预溶胀法聚合制备了PBA/聚甲基丙烯酸甲酯(PMMA)乳液,用激光散射粒度仪和透射电子显微镜对乳液粒径和结构进行了表征.结果表明,当乳化剂十二烷基硫酸钠质量分数为丙烯酸丁酯的1.5%时,可制备粒径为53.6 nm且分布窄的PBA种子乳液;通过调整补加乳化剂、单体与种子乳液的用量,可制得粒径为53.6~443.8 nm的一系列单分散PBA乳液;PBA/PMMA乳液具有完善的核壳结构,且在核壳两相间存在着一个过渡层. 相似文献
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引发剂,乳化剂对苯丙核/壳乳液合成的影响 总被引:8,自引:1,他引:8
采用预乳化工艺和半连续种子乳液聚合技术合成了具有核/壳结构的苯丙乳液,研究了引发剂种类、乳化剂用量及两阶段乳化剂用量比等对苯丙核/壳乳液合成的影响。 相似文献
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In this article, PBA/P(MMA–crosslinking agent)-composite particle latexes were prepared by semicontinuous seeded emulsion polymerization. To determine the seed emulsion's saturating capacity of an emulsifier, a mathematical model was built to simulate the changes of the seed PBA emulsion's surface tension with the amount of emulsifier added dropwise. The effects of the emulsifier amount added in the second stage and the addition method on the morphology of the composite particles were studied. The results were shown as follows: If the amount of emulsifier added in one batch to the seed emulsion in the second stage was less than or equal to the saturating capacity of emulsifier of the seed emulsion (Cs), the morphology of the particles was “core–shell”; otherwise, a few particles were of a core–shell structure. However, if shell materials were preemulsified and added dropwise at an appropriate rate, the latex particles were still of a core–shell structure, even when the amount of emulsifier added to the seed emulsion was greater than the Cs. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 969–975, 1998 相似文献
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A series of polybutylmethacrylate/organo‐attapulgite (PBMA/organo‐APT) nanocomposites were prepared by suspended emulsion polymerization using ethylene glycol dimethacrylate (EGDMA) as a crosslinker, and organo‐APT treated by different quaternary ammonium salt (C12, C16, and C18) as an inorganic component. The nanocomposites were characterized by means of Fourier transform infrared spectroscopy and scanning electron microscopy (SEM), showing that organo‐APT participated in polymerization by which a nanocomposite structure was formed. The effects of crosslinker and organo‐APT with different alkyl chain length on oil absorbency were investigated. The swelling kinetics in toluene, chloroform and gasoline were also systematically studied. The results reveal that introducing organo‐APT with moderate hydrophobic‐chain length into the PBMA polymeric network can improve oil absorption capability and swelling rate. POLYM. COMPOS., 2013 © 2013 Society of Plastics Engineers 相似文献
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介绍了种子乳液聚合、核/壳乳液聚合、无皂乳液聚合、微乳液聚合、互穿网络聚合等制备水性含硅聚合物的方法,探讨了水性含硅聚合物涂料的应用。 相似文献
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乳液聚合法是制备水性含硅聚合物最常见、最有效的方法。介绍了种子乳液聚合、核/壳乳液聚合、无皂乳液聚合、微乳液聚合、互穿网络聚合等制备水性含硅聚合物的方法,并对水性含硅聚合物涂料的应用做了探讨。 相似文献