Polímeros: Ciência e Tecnologia
https://www.revistapolimeros.org.br/article/doi/10.1590/0104-1428.20250093
Polímeros: Ciência e Tecnologia
Original Article

Research on anti-graffiti coating of nanosilica-modified two-component waterborne polyurethane

Qin Li; Dingding Xiang; Lei Shi; Qian Zeng; Rui Han; Wenhai Lin

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Abstract

We developed a new type of nano-modified two-component waterborne polyurethane(2K WPU)coating using a regular structure of nano-silica: methyl-polyhedral oligomeric silsesquioxane (POSS) as a modified material. The POSS regular cage structure is used to improve the hardness and wear resistance that waterborne polyurethane lacks, maintain its good water resistance and heat resistance, and does not contain a benzene ring structure in the coating, eliminating the hidden danger of yellowing of the original benzene ring-containing 2K WPU hardening coating. The coating was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, contact angle measurement, UV-visible spectroscopy, water absorption test, hardness test, and anti-graffiti test. The evaluation results show that the modified coating has improved water resistance, hardness and contact angle, has excellent UV resistance, and has excellent anti-graffiti performance.

 

 

Keywords

anti-graffiti, nanosilica, oligomeric silsesquioxane, surface performance improvement, water-basedpolyurethane

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