Author(s): Lei Liang, Xia Zhengbin, Yang Tao, Zhong Li, School of Chemistry and Chemical Engineering, South China University of Technology
Pages: 54-58
Year: 2015 Issue:  7
Journal: China Adhesives
Keyword:  food packaging; waterborne polyurethane; ink; binder; boiling resistance;
Abstract: The characteristics and improving methods of waterborne polyurethane(WPU)ink binder for food packaging were summarized in boiling resistance(such as thermal stability,water resistance and adhesion),drying speed,redissolving and other key properties. It was presented that the diisocyanate with symmetric structure,small molecule chain extender,and polyester polyol with neat structure and better hydrolysis resistance were used as main raw materials,so the WPU with high solid content could obtain the better boiling resistance and drying speed.On this basis,the ink printability was satisfied because the preparing composite emulsion with hydrophilic oligomer surrounded on the hydrophobic polymer(or adding excessive metal chelate),could balance the redissolving and water resistance of WPU ink. Finally,the development direction of WPU ink was expected in the future.