共查询到20条相似文献,搜索用时 93 毫秒
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以丙烯酸丁酯为核,甲基丙烯酸甲酯为壳,甲基丙烯酸等为交联单体,采用种子乳液聚合方法得到核壳乳液型弹性涂料。研究了乳化剂、单体的用量和不同的核壳单体质量比对乳液性能的影响;当m(MMA)∶m(BA)为36∶75,十二烷基磺酸钠(DBS)和壬基苯基聚氧乙基醚(OP-10)乳化剂的质量比为2∶1,乳化剂用量为单体质量的2.4%,种子乳液的用量为10%时,膜的拉伸强度、吸水率小、耐水性好及成膜性能最佳;采用分批加料的滴加方式可使聚合反应有较高的稳定性。 相似文献
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核壳型苯丙乳液的制备 总被引:7,自引:0,他引:7
采用预乳化工艺和种子乳液聚合技术合成了具有核壳结构的苯丙乳液,并讨论了引发剂、乳化剂、单体、反应温度、聚合工艺等对乳液合成的影响。最佳反应条件为:m(引发剂):m(总单体)-0.4:100.0,m(乳化剂):m(总单体)=2.2:100.0,m(苯乙烯):m(丙烯酸丁酯)=1:1。反应温度控制在80~82℃。 相似文献
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采用甲基丙烯酸甲酯/丙烯酸丁酯作复合单体,丙烯酸为功能单体,通过预乳化半连续种子乳液聚合工艺合成了核壳型丙烯酸酯乳液,讨论了反应温度、乳化剂用量、核壳单体质量比以及丙烯酸加入量对乳液性能以及漆膜力学性能的影响,并用TEM对乳胶粒子进行了表征。结果表明:采用预乳化半连续滴加法,当复合乳化剂SDS与OP-10质量比为2:1且总用量为4%,核、壳层中甲基丙烯酸甲酯与丙烯酸丁酯的质量比分别为3:7和4:1,核壳总单体质量比为1:1,丙烯酸质量分数为4%,核层和壳层反应温度分别为70℃和80%时,可以合成黏度适中、乳胶粒粒径分布均匀、稳定性好和漆膜力学性能优良的核壳型丙烯酸酯乳液。 相似文献
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采用种子乳液聚合的方法制备了具有核/壳结构的聚硅氧烷丙烯酸酯复合乳液,研究了乳化剂、单体的投料方式及配比对乳液性质的影响。结果表明:通过种子乳液聚合,得到了含氢聚硅氧烷/丙烯酸丁酯/苯乙烯/甲基丙烯酸甲酯/甲基丙烯酸(PHMS/BA/St/MMA/MAA)共聚物复合乳液,乳液性能稳定,该乳液所制得的胶膜具有优良的性能。 相似文献
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用半连续法合成了一种帆布-聚氨酯泡沫粘合用交联型聚丙烯酸酯水溶胶,讨论了交联单体用量及配比、外加交联剂的用量及固化温度等因素对胶黏剂性能的影响。研究表明交联单体用量约为4.0%,制得的胶黏剂性能优良,若外加千分之四的交联剂,在110℃下烘干固化,可显著提高该胶黏剂的耐水性。 相似文献
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Xiaoli Wang 《Powder Technology》2008,186(2):107-112
The role of pH, additive concentration, aging time and solids loading in determining the rheological properties of aqueous zirconia suspensions, which contained polyelectrolyte and sucrose molecules, was investigated. It was found that at alkaline pH, the appropriate sucrose addition (4 wt.%) enhanced the stability of zirconia suspensions with polyacrylate, and the amount of polymer required to obtain the maximum fluidity decreased as sucrose was added. However, the positive effect of sucrose on stability cannot maintain at the higher solids loading (40 vol.%) because of the bridging attraction between the overlapping adlayers. On the other hand, the effectiveness of sucrose would be greatly weakened by hydrolyzation in acidic media as well as biodegradation with aging time. 相似文献
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丙烯酸甲酯与聚醋酸乙烯酯的核/壳乳液聚合反应 总被引:4,自引:0,他引:4
本文研究了丙烯酸甲酯在聚醋酸乙烯酯种子胶粒上的核/壳复合高分子乳液聚合反应。讨论了接枝聚合反应中引发剂的浓度、单体与聚合物的比例、乳化剂用量等工艺参数对该类接枝聚合反应的影响,提出了核/壳乳液聚合反应的一些反应规律。 相似文献
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In-Soo Park 《Korean Journal of Chemical Engineering》2006,23(2):292-298
An exact analytical solution was derived for the concentration of solute or the temperature of the fluid in a constant molar
flow semi-batch well-stirred vessel in contact with permeable core-shell composites. The linear equilibria at both the fluid-particle
interface and the core-shell interface are assumed and the extraparticle film resistance is included. Several particular solutions
can be readily degenerated from the solution derived in this work. By taking the contact affinity at the core-shell interface
to zero, the solution in case of impermeable core-shell composites can be degenerated. By taking both the contact affinity
at the core-shell interface and the ratio of mass or thermal effective diffusivities in the core and the shell to unity or
by taking the size of the core to zero, the solution in case of homogeneous particles can be degenerated. The solution for
the batch vessel is also degenerated by the differentiation of the solution for the constant molar flow semi-batch vessel
with respect to time. 相似文献