两性离子型聚氨酯表面活性剂的制备与性能

Preparation and Properties of Amphoteric Polyurethane Surfactant

以氢化苯基甲烷二异氰酸酯（H-MDI）、聚氧乙烯长链烷基胺（PAE）、二羟甲基丙酸（DMPA）为主要原料,合成了一系列侧链含长链烷基和羧基、主链嵌入环氧乙烷（EO）结构的两性离子型聚氨酯表面活性剂（APU）。通过红外光谱（FTIR）、表面张力、临界胶束浓度、粒径以及电导率对其进行了分析。结果表明,当以PAE为软段单体,n（PAE）∶n（DMPA）=1∶1时,合成的聚氨酯高分子表面活性剂综合性能优异,溶液的临界胶束质量浓度为32.26 mg/L,水溶液的表面张力最低可达40.42 m N/m,且其等电区为3.5~5.5,分布较窄,可在较宽p H范围的水性体系中使用。

Based on such main raw materials as H-MDI, PAE and DMPA, a series of amphoteric polyurethane surfactant（APU）with long side chain alkyl and side chain earboxyl and with the structure of polyether （EO）embedded in main chain were synthesized. The properties were measured by infrared spectroscopy（ YHR）, surface tension, critical micelle concentration,laser-particle size analyzer and electrical conductivity. The study indicated that, when the ratio of PAE to DMPA was 1：1, APU-2 with excellent comprehensive performance was obtained. The critical micelle concentration of APU-2 was 32.26 mg/L and the surface tension could be as low as dO. 42 mN/m. Additionally, the isoelectric zone of amphoteric polyurethane was in the region of pH 3.5 ~ 5.5. With a narrow isoelectric zone distribution, APU-2 can be used in waterborne dispersions of a wide pH range.