Self-cleaning coating with high mechanical properties and high adhesion and method for its production

Abstract

The application provides a self-cleaning coating with high mechanical properties and high adhesion and a preparation method thereof, wherein firstly, a polydimethylsiloxane-based polyurea (PDMS-PUa) with high light transmittance is synthesized through a solution mixing method; subsequently, CQDs are prepared by using an alkali-assisted ultrasonic method, and the CQDs are effectively loaded and uniformly dispersed in the PDMS-PUa under continuous ultrasonic conditions, and finally, the PDMS-PUa / CQDs material is prepared. Strong hydrogen bond interaction is formed between the polar groups of the CQDs and the amino groups of the PDMS-PUa, the stability of the whole network structure is enhanced, the mechanical properties are improved, the bonding performance of the material is significantly improved, the adhesion of the PDMS-PUa / CQDs can be improved to 3.1 MPa, the tensile strength is 8.6 MPa, and the elongation rate is 718.65%. The introduction of the CQDs also improves the surface tension characteristics of the PDMS, promotes the uniform wetting of the coating material, effectively reduces the generation of bubbles and the occurrence of small hole phenomenon, and the coating material also has good self-cleaning performance.

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