Bio-Based Waterborne Polyurethane Coatings with High Transparency, Antismudge and Anticorrosive Properties

Abstract

Green and environment-friendly preparation are of the utmost relevance to the development of transparent antismudge coatings. To prepare a waterborne polyurethane (WPU) coating with antismudge property, it is challenging to balance the stability of dispersion and the antismudge property of coating. Herein, we prepare a transparent bio-based WPU coating grafted with a minor proportion of poly(dimethylsiloxane) (WPU-g-PDMS) using renewable castor oil, monocarbinol-terminated PDMS, hexamethylene diisocyanate trimer, and 2,2-bis(hydroxymethyl)propionic acid as raw materials. Effects of the dosage of monocarbinol-terminated PDMS, the curing temperature, and the curing time on the antismudge performance were studied. Results showed that rigorous stirring (3000 rpm) is necessary to obtain a stable WPU-g-PDMS dispersion with a storage time longer than 6 months. A high curing temperature (>160 °C) and a period of curing time (>1 h) are indispensable to obtain the excellent antismudge property because they would facilitate the grafted low-surface-tension PDMS chains to migrate from the interior to the coating surface. The facts that simulated contaminated liquids such as water, HCl solution, NaOH solution, artificial blood, and tissue fluid could slide off easily and cleanly, and marker ink lined on the coating surface could shrink, indicated that the WPU-g-PDMS coating has good antismudge properties, which could be self-compensated shortly after deterioration. Due to the high cross-linking degree caused by multifunctional polyol and isocyanate, the WPU-g-PDMS coating has high hardness and good anticorrosive performance. The antismudge functionalization and waterborne technology of bio-based polyurethane coatings proposed in this work could be a promising contribution to the green and sustainable development of functional coatings. This kind of WPU-g-PDMS coating is expected to protect and decorate electronic screens, vehicles, and buildings, especially endoscopes.

High-Performance Dental Resins Containing a Starburst Monomer

“…Figure 1A illustrates the fabrication of the new monomer NPUA through end-linking 3-arm precursors via the grafting-onto approach (Zhao 2019). Our selection of hexamethylene diisocyanate trimer (HDIT), formed via controlled trimerization reaction of HDI, as a building block for polycondensation products is based on its blend of aromatic characteristics (increased stiffness and refractive index) and aliphatic attributes (reduced tendency to discoloration) (Ha et al 2023). These qualities are essential in creating dental resin–based materials.…”

Research Progress of Superhydrophobic Coatings in the Protection of Earthen Sites

“…Ha et al obtained a superhydrophobic coating by doping a Waterborne polyurethane (WPU) with monocarbinol-terminated PDMS [60]. The domain size of microphase-separated PDMS was smaller than the wavelength of visible light, effectively preventing light scattering.…”

Fabrication of Bio-Based Flexible Polyurethane Foam with Biodegradation by Etherification of Kraft Lignin

“…Polyurethane (PU) is a versatile polymer material extensively used in various applications such as adhesives, coatings, elastomers, and particularly foams. , Accounting for approximately 7% of global polymer consumption, PU ranks sixth in worldwide production . Among PU materials, polyurethane foam (PUF) leads the market demand, being recognized for its low density, thermal insulation, and water-resistant properties. , The traditional synthesis of PUF relies heavily on polyester or polyether polyols, derived primarily from toxic and corrosive petroleum-based precursors like phthalic acid .…”