N,N,N’,N”,N”-Penmethyldipropylene triamine: an ideal water-based polyurethane catalyst option to facilitate green production Introduction With the increasing global environmental awareness, green production has become an important development direction of the chemical industry. As an environmentally friendly material, water-based polyurethane (WPU) is widely used in coatings, adhesives, leather, textiles and other fields due to its low volatile...