红外干燥高玻璃化温度乳液的成膜研究

Film Formation of Emulsion with High T_g via IR Drying Process

采用具有核壳结构的丙烯酸酯自交联乳液，研究其在红外干燥下的成膜及性能，并利用Routh—RUSSel模型优化确定其成膜机理，优化了成膜条件。研究表明，通过红外干燥可以实现高玻璃化温度（Tg）乳液的快速成膜。聚合物乳液Tg和湿膜厚度日能够改变Routh—Russel模型的参数λ和Pe，继而影响乳胶粒子的成膜性能。Tg〈58℃及日≤400μm时，乳胶粒子受毛细管力变形，形成连续透明的聚合物膜，其硬度相比于室温自然干燥的涂膜高出2—5倍，且耐水性显著增加。原子力显微镜（AFM）表征证实红外干燥确实能够促进乳胶粒子的融并变形。

The film formation of self-crosslinking polyacrylate core-shell emulsion via IR drying process has been studied. The film-forming mechanism has been also theoretically explored by using the Routh-Russel mode/. Results show that the IR drying process is an effec- tive way conducive for the rapid film formation of emulsion with high glass transition temperature （Tg）. The variation of Ts and wet film thickness （H） of emulsion can affect the parameters A and Pe in R-R model, and further affect the film-forming performance of emulsion particles. Under the conditions of Tg〈58 ℃ and H ≤400μm, a film with good transparency and high hardness is formed via capillary deformation of emulsion particles. Compared to the film formed under room temperature, the film formed via IR drying process shows better water resistance and higher hardness （i.e., 2-5 times）, meanwhile, the IR drying process can promote the deformation of emulsion particles as characterized by atomic force microscope （AFM）.