Accelerated Conditioning Behavior of Polyaspartic Polyurea Coating

Polyaspartic esters (PAE for short) polyurea coating is a new type of aliphatic, slow-response, high-performance coating material. Compared with polyurethane, aromatic polyurea and conventional aliphatic polyurea, PAE polyurea It has more advantages in improving the weather resistance and environmental erosion resistance of the coating. Therefore, there are many studies on the structural properties of PAE polyurea, but the aging problem is rarely involved. Therefore, the author of "Research on the Accelerated Aging Behavior of Polyaspartic Ester Polyurea Coatings" is to systematically study the aging properties of PAE polyurea coatings. , using scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS), the surface morphology of the coating after salt spray aging and UV/salt spray cyclic aging was investigated. , structural morphology and electrochemical impedance properties.

The conclusions show that: 1) SEM, AFM, FTIR and EIS studies of PAE polyurea coatings show that the ability of the coatings to withstand salt spray aging and UV/salt spray cycle aging is quite different;

2) After 25 weeks of exposure under simple salt spray aging conditions, the coating still maintained a high electrochemical impedance. SEM, AFM and FTIR studies showed that the surface morphology and structure of the coating did not change significantly at this time. layers remain dense. The research results show that the coating has good salt spray aging resistance;

3) Under the UV/salt spray cyclic aging conditions, the electrochemical impedance of the coating decreased significantly with the prolongation of the exposure time, and the impedance spectrum showed multiple time constants after 25 weeks of exposure. The study of surface morphology found that the surface roughness of the coating increased at this time, the structural morphology was severely damaged, and the molecular chains of both soft and hard segments were broken. Changes in structural morphology ultimately lead to reduced corrosion resistance of coatings after UV/salt spray cyclic aging.

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