二聚酸钠丙烯酸酯无皂乳液
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摘要
本文旨在开发一种性能优良的反应型阴离子乳化剂,并应用这种乳化剂合成丙烯酸酯无皂乳液。
     采用源白天然原料的二聚酸合成了一种反应型乳化剂二聚酸钠(SDA),其结构具有双子乳化剂的特征一具有双亲水基双亲油基。单独使用该乳化剂以半连续种子乳液聚合法制备了丙烯酸酯无皂乳液。对自制的反应型乳化剂进行了乳化力测试和溶液表面张力的测试,研究了乳化剂用量及聚合工艺对乳液性能的影响,并用红外、核磁、粒度分析仪对聚合物进行了表征。
     试验结果表明,二聚酸钠乳化力优于常用的阴离子乳化剂十二烷基硫酸钠(SDS),其临界胶束浓度为28.6mmol/L,水溶液的表面张力为28.8mN·m-1。乳化剂HLB计算值为29.5。用二聚酸钠制备的无皂乳液的表面张力测试结果比较高(50.4-64.8mN·m-1),接近于纯水的表面张力(72mmol/L),表明SDA键合在乳胶粒上,而残留在水溶液中甚少。
     当乳化剂用量为单体质量的8%,反应温度78-80℃,采取两阶段保温法,引发剂用量为单体质量的0.7%,种子单体用量为全部单体质量15%时可以合成固含量为45%的丙烯酸酯无皂乳液,采用单体质量3%的甲基丙烯酸-β-羟乙酯作为功能单体对乳液性能有较大的改善。合成的无皂乳液平均粒径100nm,粒子呈单分散分布,PDI为0.0595,乳液的Zeta电位可达。70mv,可见乳液稳定性较好,各项性能指标均合格,乳胶膜耐水性能较好。对乳胶膜的核磁共振分析和红外分析均证实该反应型乳化剂参与了自由基共聚合。
The aim of this research is to develop a novel polymerizable anionic emulsifier with good emulsification and polymerization.An emulsifier-free acrylic emulsion was synthesized in the presence of this polymerizable emulsifier.
     A polymerizable anionic emulsifier was successfully prepared by using dimer acid derived from nature,and it has the Gemini surfactants'structure-it has two hydrophilic groups and two lipophilic groups.The soap-free emulsion polymer was synthesized via semi-continuous seeded emulsion polymerization. Its emulsification and the surface tension were mensurated.The effects of level of emulsifier amount and polymerization process on the emulsion properties were investigated. In addition, the emulsion and the films were characterized by Fourier transformed infrared (FT-IR) spectrometry, nuclear magnetic resonance(1H-NMR) spectrometry, and size analysis, respectively.
     Test results indicated:the novel polymerizable anionic emulsifier itself had better emulsifying capacity compared with the anionic emulsifier sodium dodecyl sulfate (SDS)used commonly. The maximum bubble method was used to test the surface tension and the results showed that the critical micelle concentration (CMC) of the polymerizable anionic emulsifier was 28.6mmol/L, the surface tension of its solution was 28.8mN·m-1.The calculated HLB value of this emulsifier was 29.5.The surface tension of emulsion obtained by the SDA was high(50.4-64.8 mN·m-1),which closed to the surface tension of pure water(72mmol/L), indicating that the SDA combined in latex particles by chemical bonds,only low concentrations of SDA existed in the water phase.
     Monomer content of emulsifier-free acrylic emulsion up to 45wt% could be successfully synthesized when the emulsifier amount was 8%,reaction temperature was 78-80℃,the initiator amount was 0.7%,the seed monomer amount was 15%, adopting two stage heat preservation. It showed that emulsion properties could be greatly improved by using 3wt% of 2-hydroxyethyl methacrylate (HEMA) as a functional monomer. The emulsifier-free acrylic emulsion was synthesized at an average diameter of 100nm,with a monodisperse of particle, PDI of 0.0595,Zeta potential of -70mv. It showed that the stability of emulsion was very good, every performance index was qualified and the water resistance of latex film was outstanding.1H-NMR and IR analysis confirmed that the reactive emulsifier were involved in the radical copolymerization.
引文
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