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采用间歇式预乳化聚合工艺,选用环保型阴非离子型乳化剂异构十三醇聚氧乙烯醚硫酸铵(DNS-525)和非离子乳化剂烷基醇聚氧乙烯醚(EFS-470)替代传统的烷基酚聚氧乙烯醚(APEO)乳化剂,并与交联单体复配成助剂1和助剂2。采用多因素正交小试实验考察三个因素(助剂1、保护胶体PVA1788、助剂2)对JS防水涂料用的苯丙乳液性能的影响,用FTIR对其结构进行表征。试验表明:新型复配乳化剂能大大提高乳液的稳定性,减少乳化剂的用量;助剂1对胶乳性能影响最大,助剂2次之,保护胶体PVA1788最小,并得到最佳的工艺参数;以此优化工艺参数为依据,制备出稳定性和涂膜弹性优异的苯丙乳液,该乳液和水泥粉料以1.4:1混合,制备出涂膜拉伸强度为2.1MPa,断裂伸长率为200%的高性能JS防水涂料。 相似文献
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在乳液聚合中,乳化剂的选择和用量对乳液的性能至关重要。本文主要研究了苯丙微乳液聚合中乳化剂复配种类、含量和复配比对乳液性能的影响。 相似文献
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使用3种可聚合乳化剂制备了水基胶粘剂用丙烯酸酯乳液。考查了可聚合乳化剂与单体间的共聚性能,比较了各乳化剂用量对丙烯酸酯乳液的固含量和单体转化率、乳液稳定性(聚合稳定性、贮存稳定性、冻融稳定性)以及乳胶膜的耐水性等性能的影响。结果表明,乳化剂1-烯丙氧基-3-(4-壬基苯氧基)-2-丙醇聚氧乙烯(10)醚(ANPEO10)、烯丙氧基壬基酚聚氧乙烯(10)醚双磷酸(ANPEO10-P2)和烯丙氧基壬基酚聚氧乙烯(10)醚硫酸铵(DNS-86)均成功地聚合到丙烯酸酯聚合物中。用3种乳化剂制备的乳液性能各有特点。使用DNS-86以及ANPEO10-P2制得的乳液的贮存稳定性好;用ANPEO10制得乳液的冻融稳定性最好;使用DNS-86制得的乳胶膜的耐水性最好。3种乳化剂用量均为2.0%时,制得的乳液综合性能最好。 相似文献
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以十二烷基苯磺酸钠(SDBS)为阴离子型乳化剂、辛烷基苯酚聚氧乙烯醚-10(OP-10)为非离子型乳化剂、烯丙氧基壬基苯氧基丙醇聚氧乙烯醚硫酸铵(SE-10)为可聚合型乳化剂、苯乙烯(St)为硬单体、丙烯酸丁酯(BA)为软单体和丙烯酸(AA)为功能单体等,在复合乳化剂OP-10/SDBS、OP-10/SE-10作用下分别制备了纸/塑、塑/塑复膜胶。结果表明:SE-10的乳化效果优于SDBS,前者可有效提高复膜胶的初粘力和剥离强度,并可有效降低乳胶粒的平均粒径;以OP-10/SE-10作为复合乳化剂,当w(AA)=8.3%时,复膜胶的初粘力和剥离强度均达到最大值,并且其热稳定性相对较好。 相似文献
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反应型乳化剂对苯丙微皂乳液聚合及性能的影响 总被引:4,自引:0,他引:4
采用不同结构类型的反应型乳化剂应用于苯丙微皂乳液的聚合,讨论了聚合方式、乳化剂的结构类型和用量等对乳液聚合及性能的影响。借助DSC、粒径分布仪、FT-IR、拉力机、TEM等仪器及分析技术对制得的苯丙乳液的性能进行表征分析,发现通过半连续核壳乳液聚合方式,采用合适的反应型乳化剂复配体系,可以制备出综合性能优异,粒径小于100 nm的苯丙微皂乳液。 相似文献
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Seeded batch emulsion polymerization of styrene and acrylic acid was studied. The influence of pH and acrylic acid content on the polymerization rate and the amount of carboxylic acid groups incorporated in the final latex products was investigated. The distribution of the functional groups over the aqueous phase, the latex particle surface, and the interior of the latex particle was determined using aqueous conductometric titration and nonaqueous potentiometric titration at intermediate and complete overall conversions. Combined with kinetic results, the carboxylic acid group distribution history provided valuable information about the process of incorporation of acrylic acid in latex products. Two‐step processes in which a shot of acrylic acid was performed in the last stage of the emulsion polymerization reaction were investigated as a strategy to increase the surface incorporation efficiency. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 875–885, 2000 相似文献
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M. Slawinski M. A. J. Schellekens J. Meuldijk A. M. Van Herk A. L. German 《应用聚合物科学杂志》2000,76(7):1186-1196
The seeded batch emulsion copolymerization of styrene and acrylic acid was studied. The polymerization rate was investigated with pH as the main parameter. Some attempts were made to evaluate the average number of growing chains per particle during Stage II of the emulsion polymerization process. The final latex products were characterized by means of conductometric aqueous titration and potentiometric titration in an organic solvent mixture. The distribution of the acid groups over the aqueous phase, the particle surface, and the interior of the particles together with the kinetic results provided insight into important features governing the incorporation of acrylic acid. The results indicate that pH is the dominating parameter for the incorporation process. An optimal incorporation on the surface of the particles is observed for a low value of pH. In that case, all the acid groups are protonated. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1186–1196, 2000 相似文献
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Results are reported for (a) the reproducibility of styrene–acrylic acid emulsion copolymerisations using (i) sodium lauryl sulphate and (ii) sodium dodecylbenzenesulphonate as stabiliser, and (b) the effect of small amounts of isopropanol upon the emulsion copolymerisation of styrene and acrylic acid using sodium dodecylbenzenesulphonate as stabiliser. Lack of reproducibility of the conversion–time results when sodium lauryl sulphate was used as stabiliser is attributed to partial hydrolysis of the stabiliser brought about by the low pH of the reaction system. 相似文献
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