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选用表面光滑且呈规则球形的玻璃微珠作为芯材,排除芯材不稳定性对原位聚合成壁过程的影响,利用扫描电镜观察反应时间、反应温度和催化剂用量对壁材微观形貌的影响,探讨三聚氰胺-甲醛树脂微胶囊的成壁机理。结果表明,随着反应时间的延长,粒径小于200 nm的树脂颗粒逐渐覆盖在芯材表面形成壁材。反应温度的升高和催化剂用量的增加对壁材的形成具有促进作用,然而当其分别增加至75℃和5.4 g时,壁材的平整度明显下降。三聚氰胺-甲醛树脂微胶囊成壁过程可分为3个阶段:预聚物分子缩聚形成大分子树脂颗粒,树脂颗粒从溶液中析出沉积在芯材表面,颗粒相互粘连形成连续壁材。
Select the smooth and regular spherical glass beads as the core material to exclude the instability of the core material on the wall in situ polymerization process, the use of scanning electron microscopy reaction time, the reaction temperature and the amount of catalyst on the wall surface morphology Influence, explore the melamine - formaldehyde resin microcapsules into the wall mechanism. The results show that with the extension of the reaction time, the resin particles with particle size less than 200 nm gradually cover the surface of the core material to form the wall material. The increase of reaction temperature and the increase of catalyst dosage can promote the formation of wall material, however, the flatness of wall material decreases obviously when it increases to 75 ℃ and 5.4 g respectively. Melamine-formaldehyde resin microcapsules into the wall can be divided into three stages: the prepolymer molecules polycondensation to form macromolecular resin particles, the resin particles precipitated from the solution deposited on the core surface, the particles conglutinate to form a continuous wall.