Effects of Sericite and Silane Coupling Agent KH550 on Saline Water Resistance of Polyurethane/Al-Sm2 O3 Composite Coatings

The work aims to improve saline water resistance of polyurethane(PU)/Al-Sm2 O3 composite coatings. PU/Al-Sm2O3 cm 10 days after saline water corrosion. Sericite and KH550 modification can improve the stability of low near-infrared reflection propertyand mechanical properties of PU/Al-Sm×composite coatings were modified with sericite and silane coupling agent KH550, and varying patterns of microstructure, infrared emissivity, near-infrared reflectivity and mechanical properties of the coatings before and after modification were sys-tematically investigated, then the causes were analyzed and discussed. Compared with the unmodified coatings, microstructure of the modified sericite and KH550 coatings was almost unchanged after corrosion, and the modified coatings had lower near-infrared reflectivity of 1.06 μm and better mechanical properties under the same corrosion conditions of saline water. Hardness, adhesion strength and impact strength of the modified coatings were maintained at 3H, grade 1 and 50 kg2O3 composite coatings to saline water corrosion. © 2017, Chongqing Wujiu Periodicals Press. All rights reserved.