锂皂石-尿素在ASA乳液制备中的协同稳定作用

Preparation and Sizing Performance of ASA Emulsions Stabilized by Laponite and Urea

关键词:  施胶  ASA  Pickering乳液  锂皂石  尿素

Key Words:sizing  ASA  Pickering emulsions  Laponite  urea

摘要:利用锂皂石与尿素协同乳化烯基琥珀酸酐（ASA），制备ASA乳液。研究了锂皂石和尿素用量、乳化速度和乳化时间对乳液稳定性的影响，并分析了所制备ASA乳液的施胶性能。结果表明，固定ASA与水的比为1∶3，当转速为4000 r/min、乳化时间为3 min、锂皂石用量相对于ASA与水的总量达到0.6%时，乳液放置24 h仍未出现分层现象。尿素的加入可以在较低的锂皂石用量（0.4%）下制得更稳定的乳液，同时显著提高了ASA乳液的施胶性能。

Abstract:In this paper, Laponite nanoparticles together with urea were used to stabilize ASA emulsions, in which Laponite particles provided mechanical barrier to prevent the coalescence of ASA droplets while urea enhanced both the emulsion stability and sizing performance of ASA. By detecting the influences of various emulsification parameters on the stability of ASA emulsions and their sizing performance, the emulsification process was optimized. The results indicated that, when the volume ratio of oil to water fixed at 1∶3, the revolving speed was 4000 r/min, the emulsification time was 3 min, and the dosage of Laponite was 0.6% based on ASA and water, the emulsion would not be separated into different lagers after 24 h. Furthermore, the addition of urea could make the emulsions more stable at lower Laponite addition levels and significantly improve the sizing performance of ASA emulsions.