Synthesis of a Waterborne Polyurethane-Fluorinated Emulsion and Its Hydrophobic Properties of Coating Films

Abstract

In this study, a novel waterborne polyurethane-fluorinated acrylic (WFPU) hybrid emulsion was synthesized and introduced. The cross-linker aziridine was used to enhance the film-forming capacity and mechanical property of WFPU. FTIR and XPS results confirmed that WFPU latex was successfully prepared. WFPU has an excellent hydrophobicity, resulting in an obvious increasing of water contact angle from 58.5° to 92.5°. AFM measurements observed that a continuous polymer film was formed after adding the cross-linker, indicating an excellent film-forming capacity of the cross-linked WFPU. The influence of the amount of the cross-linker on the hydrophobicity and mechanical properties was also studied. Cotton coating experiments visually approved that the cotton hydrophobicity is effectively enhanced by WFPU and the cross-linked WFPU. These results indicated that the cross-linked WFPU containing 30 wt % of fluorinated acrylate and 2.93 wt % of cross-linker has a potential as a coating material for water repellent applications due to providing fantastic hydrophobicity, excellent film-forming capacity, and outstanding mechanical properties.

Green and Ethanol‐Resistant Polyurethane Nanofibrous Membranes Based on an Ethanol Solvent for Waterproof and Breathable Textiles

“…And this peak was assigned to the N‐H stretching vibration in the carbamate group (NHCOO − ). [ 53 ] In addition, the characteristic peak in 1066 cm −1 appeared in the treated EPU/FPU/TTMA membranes, corresponding to CO stretching adsorptions, whose intensity was enhanced gradually with the increase of TTMA concentration. [ 54 ] Moreover, the characteristic peak in1718 cm −1 corresponded to the vibration of the carbonyl group (CO), and the peak intensity was enlarged with the increase of TTMA concentration, proving the crosslinking reaction between EPU and TTMA.…”

The study of cationic waterborne polyurethanes modified by two different forms of polydimethylsiloxane

“…The XPS measurement range for the CWPU sample shows three resolved peaks from carbon (C 1s, 285.0 eV), nitrogen (N 1s, 401.0 eV) and oxygen (O 1s, 532.0 eV). 30 Comparatively, there were additional peaks from silicon (Si 2s at about 154.0 eV and Si 2p at about 102.0 eV) following the addition of organosiloxanes, which proved that silicone was incorporated into polyurethane. 31 Table 3.…”

Optimization of Waterborne Poly(Urethane-Acrylate) Nanoemulsions Based on Cationic Polymerizable Macrosurfactants with Different Hydrophobic Side Chain Length

“…Due to its outstanding structure designability, waterborne polyurethane (WPU) has been widely applied in several industrial fields [1][2][3][4][5], like coating, sizing agent, and smart surface material, etc. [6][7][8]. However, WPU also has several deficiencies, including poor water resistance, low thermal stability, and mechanical properties, which limit the extensive utilization of WPU to some extent [9,10].…”