使用添加的液体来抑制硬颗粒涂层中的干燥缺陷
Using an added liquid to suppress drying defects in hard particle coatings
摘要：
假设：在硬颗粒涂层的干燥过程中的横向累积和膜缺陷是一个常见的问题，通常使用聚合物添加剂和表面活性成分来解决，这需要对干燥的膜进行进一步处理。毛细管悬浮液具有可调的物理性质，不含聚合物，为生产均匀和无缺陷的颗粒涂层提供了新的途径。实验：研究了少量二次液对涂料干燥性能的影响。同时测量温度和湿度控制的干燥室中的应力积累和重量损失。涂层的反射率和高度轮廓随时间的变化与重量损失和应力曲线有关。结果：毛细管混悬液干燥均匀，无缺陷。横向干燥受到高屈服应力的抑制，导致涂层收缩到均匀的高度。颗粒之间的桥梁防止空气侵入并延长恒定干燥时间。下层中的液体通过表面孔隙内的角流被输送到界面，导致在基底附近的部分干燥层，而上面的孔隙仍然饱和。将毛细管悬浮液用于硬颗粒涂层可产生更均匀、无缺陷的薄膜，具有更好的印刷特性，从而淘汰高添加剂含量。
英文摘要：
Hypothesis: Lateral accumulation and film defects during drying of hard particle coatings is a common problem, typically solved using polymeric additives and surface active ingredients, which require further processing of the dried film. Capillary suspensions with their tunable physical properties, devoid of polymers, offer new pathways in producing uniform and defect free particulate coatings. Experiments: We investigated the effect of small amounts of secondary liquid on the coating's drying behavior. Stress build-up and weight loss in a temperature and humidity controlled drying chamber were simultaneously measured. Changes in the coating's reflectance and height profile over time were related with the weight loss and stress curve. Findings: Capillary suspensions dry uniformly without defects. Lateral drying is inhibited by the high yield stress, causing the coating to shrink to an even height. The bridges between particles prevent air invasion and extend the constant drying period. The liquid in the lower layers is transported to the interface via corner flow within surface pores, leading to a partially dry layer near the substrate while the pores above are still saturated. Using capillary suspensions for hard particle coatings results in more uniform, defect free films with better printing characteristics, rendering high additive content obsolete.
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