Robust, Flame-Retardant, and Anti-Corrosive Waterborne Polyurethane Enabled by a PN Synergistic Flame-Retardant Containing Benzimidazole and Phosphinate Groups

Abstract

Waterborne polyurethanes (WPUs) have attracted great interest owing to their environmentally friendly properties, and are wildly applied in production and daily life. However, waterborne polyurethanes are flammable. Up to now, the challenge remains to prepare WPUs with excellent flame resistance, high emulsion stability, and outstanding mechanical properties. Herein, a novel flame-retardant additive, 2-hydroxyethan-1-aminium (2-(1H-benzo[d]imidazol-2-yl)ethyl)(phenyl)phosphinate (BIEP-ETA) has been synthesized and applied to improve the flame resistance of WPUs, which has both phosphorus nitrogen synergistic effect and the ability to form hydrogen bonds with WPUs. The WPU blends (WPU/FRs) exhibited a positive fire-retardant effect in both the vapor and condensed phases, with significantly improved self-extinguishing performance and reduced heat release value. Interestingly, thanks to the good compatibility between BIEP-ETA and WPUs, WPU/FRs not only have higher emulsion stability, but also have better mechanical properties with synchronously improved tensile strength and toughness. Moreover, WPU/FRs also exhibit excellent potential as a corrosion-resistant coating.

Facile Fabrication of Highly Efficient Chitosan-Based Multifunctional Coating for Cotton Fabrics with Excellent Flame-Retardant and Antibacterial Properties

“…Figure 8 presents the FT-IR spectra of volatile products obtained from the cotton fabric and ATMP-CS@C11.5 fabric throughout the thermal decomposition process, including 3D spectrograms and infrared spectra collected at various temperatures. The infrared spectra of both samples exhibit characteristic bands originating from the decomposition of polysaccharides, including hydroxyl compounds (3400-3700 cm −1 ) [19], hydrocarbons (2800-3200 cm −1 ) [42], carbonyl compound (1600-1850 cm −1 ) [43,44], CO 2 (2250-2400 cm −1 ), and ether compounds (950-1250 cm −1 ) [42,45]. In contrast, the absorption peaks of the volatile products of coated fabrics were observed at lower temperatures, aligning with the TGA results and providing further confirmation of early decomposition.…”

Analysis of Paint Properties According to Expandable Graphite and Fire Simulation Research on Firewall Penetration Part

“…To replace existing paints, non-halogen paints such as inorganic, phosphorus, and melamine paints are used. However, they are mostly being used as an additive to combustible substances [ 1 , 2 , 3 , 4 , 5 ]. In accordance with global eco-friendly trends and regulations on flame retardant performance, research and development on paint materials is being conducted.…”