Edible super-hydrophobic coatings have attracted great attentions as they can avoid the waste of liquid foods, such as honey and milk, adhered to the inside of containers. However, the poor thermal stabilities of edible super-hydrophobic coatings restrict their applications. In this work, a thermo-resistant edible super-hydrophobic coating has been fabricated using beeswax and coffee, which are approved by U.S. Food and Drug Administration. This coating surface has the similar micro/nanoscale structure to that of the leaf surface. A variety of liquid foods can freely roll on this coating surface in spherical. This special wetting property effectively reduces the residue of liquid foods, when they are poured out of the containers. With the introduction of coffee lignin, the thermal stability and adhesive force of the coating increases significantly. The apparent contact angle of this coating can remain to be above 150° after a long-time heating and flushing. This thermo-resistant edible super-hydrophobic coating can solve the problem that original edible super-hydrophobic coating is not resistant to high temperature, and has a broad application prospect in the field of functional food packaging.

可食用的超疏水性涂料已引起人们极大的关注，因为它们可以避免浪费液体食品（例如蜂蜜和牛奶），这些食品粘附在容器内部。但是，可食用的超疏水涂料的热稳定性差，限制了它们的应用。在这项工作中，使用蜂蜡和咖啡制作了耐热可食用的超疏水涂层，这已获得美国食品和药物管理局的批准。该涂层表面具有与叶片表面相似的微米/纳米尺度结构。各种液态食品可以在球形的涂层表面上自由滚动。当液体食物从容器中倒出时，这种特殊的润湿性能可有效减少液体食物的残留。随着咖啡木质素的引入，涂层的热稳定性和粘合力显着提高。长时间加热和冲洗后，该涂层的表观接触角可保持在150°以上。该耐热食用超疏水涂层可以解决原有的食用超疏水涂层不耐高温的问题，在功能性食品包装领域具有广阔的应用前景。