Development and Application of Rubber Windshield Protective Coating
In this paper,polyaspartate resin and polycarbonate polyol were used as the base resin,and the elastic polyurethane coating was prepared by a two-step method.The prepolymer was first prepared by polycaprolactone polyol and isophorone diisocyanate,and then mixed with HDI tripolymer as curing agent.The polycarbonate polyol and HDI tripolymer were used to adjust the resilience and hardness of the coating.The effects of molecular weight of polycaprolactone polyol,content of prepolymer isocyanate and chain extension coefficient R on the elongation at break and tensile strength of the coating film,the effects of the dosage of polycarbonate and HDI tripolymer on the resilience and hardness,and the effects of the main components of the coating system and the different dosage of various ultraviolet absorbers on the weather resistance were discussed.The results showed that when R value was 1.05,1 000 molecular weight polycaprolactone polyol was soft segment,equivalent ratio of PCDL∶NH1420∶PCL prepolymer∶N3390 was 0.3∶0.7∶0.65∶0.4,and UV absorber T249 was added 2%,the overall performance of the coating was the best,it can meet the technical indicators of rubber windshield protection coatings.