CAJ | 학술논문

本文合成了离子/非离子复合型亲水单体(K600)，并以K600、IPDI、聚酯二元醇为原料制备了自乳化聚氨酯乳液.考察了K600对乳液外观、粒径、粘度、冻融稳定性、高温稳定性、抗电解质能力、pH值稳定性等性质的影响.结果显示，以K600制得的乳液具有优异的综合稳定性，-20℃，18?h冻融5次以上仍然稳定；可以耐受80℃的长期高温；可与10%NaCl溶液以任意比例混合；可在pH=1～14的范围内性质稳定，说明离子/非离子复合型亲水单体对体系的综合稳定性具有很大的作用.
본문합성료리자/비리자복합형친수단체(K600)，병이K600、IPDI、취지이원순위원료제비료자유화취안지유액.고찰료K600대유액외관、립경、점도、동융은정성、고온은정성、항전해질능력、pH치은정성등성질적영향.결과현시，이K600제득적유액구유우이적종합은정성，-20℃，18?h동융5차이상잉연은정；가이내수80℃적장기고온；가여10%NaCl용액이임의비례혼합；가재pH=1～14적범위내성질은정，설명리자/비리자복합형친수단체대체계적종합은정성구유흔대적작용.
A new type hydrophilic monomer (K600) with both ionic groups and nonionic segments is synthesized from polyethylene oxide (Mn=600) and 1,2,4,5-benzenetetracarboxylic dianhydride (BTDA).The synthesis process is monitored with FT-IR.Several selfemulsifiable polyurethane emulsions are prepared from isophorone diisocyanate (IPDI), poly(butylene adipate)(PBA) and K600 in a prepolymer mixing process using substantial amount of solvent.The acid groups are neutralized with triethylamine(TEA).The emulsion based on dimethylolpropanic acid (DMPA) is prepared by the same procedure for comparison.The effect of K600 content on the characteristics of emulsions,such as visual appearance,particle size,viscosity,durability to frost,electrolytes and variation of pH,are studied.Since K600 has been neutralized with TEA to give an anionic species,which is hydrophilic in nature,the hydrophilicity of polymer chains increases with increasing the K600 content.As a result,the particle size becomes finer (<100?nm) while the emulsion appearance varies from white to translucent and the viscosity of emulsion increases accordingly.In the meantime,the ionic groups and nonionic segments have a synergistic effect.The emulsion with over 1.7?wt% carboxyl content can endure high temperature (80℃) for more than 120?h and the variation of emulsion viscosity is very low after frost.The emulsion with over 1.0?wt% carboxyl content is stable within a pH range from 1 to 14 and can be mixed with 10% NaCl solution at any ratio without any sedimentation.On the other hand,the emulsion based on DMPA is very sensitive to the variation of pH values and electrolytes.In conclusion,K600 can provide the emulsions excellent stability.