UV light-curing preparation of polyurethane film and its application in coating finishing of cotton fabric

Preparation of polyurethane film based on UV light-curing reaction was carried out using polyurethane acrylate,tri-propylene glycol diacrylate( TPGDA),Darocure 184 and ethyl acetate as raw materials. The properties of the UV-cured film were analyzed,including sunlight resistance,wear resistance, water absorption and solubility. The structure and performance of the film were also characterized by using FT-IR and TGA. The characteristics of surface morphology,contact angle and tensile strength of the fabric coated with the film were measured using SEM and other test instruments. The results indicated that the UV-curing method imparted satisfactory properties to the polyurethane film, such as stability of structure below 300 ℃,acceptable fastness to sunlight and abrasion resistance,low water absorption and solubility. The contact angle for the coated cotton fabric reached 128. 6° after UVcured reaction,meanwhile,waterproofness and tensile strength were noticeably better as compared with those of the blank.