新型反应型乳化剂二聚酸钠的性能研究

Study of the Properties of Reactive Emulsifier Sodium Dimmer Acid

采用源自天然原料的二聚酸制得一种反应型阴离子乳化剂,单独使用该乳化剂以半连续种子乳液聚合法制得乳液.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.采用粒径分析、1H-NMR和表面张力对乳液进行了表征.试验结果表明,自制反应型乳化剂乳化力优于常用的阴离子乳化剂十二烷基硫酸钠(SDS),其临界胶束摩尔浓度为28.6 mmol/L.1H-NMR和表面张力测试均表明该乳化剂参与自由基聚合反应,由该反应型乳化剂制得乳液聚合物的24 h吸水率仅为2.81%,Zeta电位可达-70～-60 mV.

A polymerizable anionic emulsifier was successfully prepared by using dimer acid derived from nature,latex with this polymerizable anionic emulsifier used exclusively was prepared through semi-continuous seeded emulsion polymerization.Its emulsification and the surface tension were mensurated.The latex particle size and chemical composition were investigated by size analysis,nuclear magnetic resonance（1H-NMR） and surface tension.Test results showed that this new polymerizable anionic emulsifier had better emulsifying capacity,compared with the commonly used anionic emulsifier sodium dodecyl sulfate（SDS）,the critical micelle concentration of the polymerizable anionic emulsifier was 28.6 mmol / L.1H-NMR and surface tension tests indicated that the polymerizable anionic emulsifier might have copolymerized with the monomer in free radical polymerization.The water absorption ratio and Zeta potential of the emulsion prepared with this polymerizable anionic emulsifier were only 2.81% after 24 hours and-70 to-60 mV.