固化温度对聚苯乙烯空心微球质量的影响

在乳液微封装技术制备聚苯乙烯空心微球的工艺中,固化过程是决定微球球形度及壁厚均匀性的关键阶段。基于乳粒发生器制备内径(850±10)μm、壁厚(250±25)μm的复合乳粒,以25℃,45℃和65℃作为固化温度,考察了固化温度对微球球形度和壁厚均匀性的影响。结果表明,固化温度越低,界面张力越高,乳液固化速率越慢,微球球形度和壁厚均匀性越好。当固化温度为25℃时,批次微球中球形偏离值优于2μm的微球产率为90%,壁厚偏差值优于2μm的微球产率为40%,明显优于固化温度为45℃和65℃时微球的质量。

Influence of curing temperature on quality of polystyrene shells

During the fabrication process of polystyrene (PS) shells by emulsion microencapsulation method, solidification is a critical stage that influences the sphericity and wall thickness uniformity. The diameter and wall thickness of compound droplets prepared by the droplet generator were (85010) m and (25025) m respectively. To study the effects of curing temperature on the sphericity and wall thickness uniformity, the curing temperature was set at 25 ℃, 45 ℃ and 65 ℃. The experimental results show that lower temperature improves the sphericity and wall thickness uniformity due to higher interfacial tension and slower velocity of emulsion solidification. When the curing temperature was 25 ℃, the batch yield of PS shells with difference between the maximum and minimum radii less than 2 m is 90%, and with the maximum deviation of wall thickness less than 2 m is 40%, obviously better than that prepared at 45 ℃ and 65 ℃.