CAJ | 학술논문

在质量分数为30.0%的水溶性聚酯乳液中，添加少量乙醇溶剂代替水可极大降低乳液的黏度。随着乙醇含量的增加，乳液黏度先减小后增加；乙醇质量分数为1.0%～9.0%时水溶性聚酯乳液黏度较低，超过9.0%时黏度急剧增加。用激光粒径分析仪测定了乳液粒径和界面电位。结果表明：添加少量乙醇引起水溶性聚酯乳液黏度降低的原因是由于乙醇共溶剂不利于聚酯高分子链中磺酸基的离子化，Zeta电位下降，且使乳液胶粒溶胀，导致其粒径增加；当乙醇质量分数超过9.0%后，水溶性聚酯乳液粒径快速增加，聚酯乳液胶粒扩散层重叠，导致体系黏度急剧增加。
재질량분수위30.0%적수용성취지유액중，첨가소량을순용제대체수가겁대강저유액적점도。수착을순함량적증가，유액점도선감소후증가；을순질량분수위1.0%～9.0%시수용성취지유액점도교저，초과9.0%시점도급극증가。용격광립경분석의측정료유액립경화계면전위。결과표명：첨가소량을순인기수용성취지유액점도강저적원인시유우을순공용제불리우취지고분자련중광산기적리자화，Zeta전위하강，차사유액효립용창，도치기립경증가；당을순질량분수초과9.0%후，수용성취지유액립경쾌속증가，취지유액효립확산층중첩，도치체계점도급극증가。
Adding a small amount of ethanol solvent instead of water in a water-soluble polyester emulsion containing 30% solid by mass could decrease viscosity of the emulsion significantly. The viscosity of the emulsion decreased first and increased then with the rise in ethanol content. The viscosity of the water-soluble polyester emulsion was low when the mass percentage of ethanol was 1.0%-9.0%, while the viscosity increased rapidly as the ethanol content was more than 9.0%. The emulsion particle size and interface potential were measured by laser particle size analyzer. The data analysis showed that the reduction in the viscosity of the water-soluble polyester emulsion after the addition of a small amount of ethanol was due to an unfavorable effect of ethanol co-solvent on the ionization of sulfonic acid group in the polyester polymer chain. Consequently, Zeta potentials decreased and the swelling of the particles of the emulsion resulted in the enlargement of the emulsion particle diameter. The particle diameter of the water-souluble polyester emulsion grew rapidly which may cause overlapping of diffusion layers between polyester particles in the emulsion, leading to sharp increases of the system viscosity when the mass percentage of ethanol exceeded 9.0% in the emulsion.