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Monday, 17 February 2020
Raw materials & technologies, Technologies, Waterborne coatings

Siloxane-modified waterbased polyurethanes: Promising antifouling coatings

Tuesday, 3 September 2013

Chinese researchers modified two-component waterbased polyurethanes with siloxane. The result is high thermal stability and good surface properties.

The siloxane-modified waterbased polyurethanes are promising antifouling coatings 

Source: Limnomar

The siloxane-modified waterbased polyurethanes are promising antifouling coatings 

Source: Limnomar

Zhen Ge and Yunjun Luo from Beijing Institute of Technology (China) synthesised a series of siloxane-modified two-component waterbased polyurethane (2K WPU) by the reaction between siloxane-modified hydroxyl-functional polyurethane aqueous dispersion and the hydrophilic-modified polyisocyanate.

Analytical investigation of the 2K WPUs

The researchers characterised the siloxane-modified 2K WPUs by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and surface contact angle measurement.

The effect of dihydroxybutyl-terminated polydimethylsiloxane (DHPDMS) content on the application properties (water and chemical resistance, flexibility, impact resistance, dry time, gloss, hardness and adhesion) of siloxane-modified 2K WPU coatings was also investigated.

Si–O–Si crosslinking network allows high thermal stability  

The results showed that the siloxane-modified 2K WPUs had better thermal stability owing to the forming of Si–O–Si crosslinking network and good surface properties due to the enrichment of siloxane chains on the surface of films compared with conventional 2K WPU. The application properties of the siloxane-modified 2K WPUs are satisfactory for their use in antifouling coatings.

Please find further information here:

Progress in Organic Coatings, Volume 76, Issue 11, 2013, pp 1522-1526.

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