Synthesis and characterization of organosilicon-modified self-matting waterborne polyurethane with excellent wear resistance

Self-matting waterborne polyurethane (WPU) with a rough surface suffers from poor wear resistance, which inevitably hinders its service span. Here, wear-resistant and self-matting WPU resin was prepared via using hydroxypropyl-terminated polydimethylsiloxane (PDMS) in the preparation of prepolymer and N -2-aminoethyl-3-aminopropyltrimethoxysilane (KH-792) as a post-chain extender. The effects of PDMS, 2, 2-Bis(hydroxymethyl)propionic acid (DMPA), and KH-792 on its morphology, particle size, gloss, wear resistance, and hydrophilicity of WPU were also investigated. The gloss of WPU coatings was found to be negatively correlated with the amount of DMPA. Moreover, the matting effect and the wear resistance of WPU were significantly enhanced by the introduction of PDMS and KH-792. When the content of PDMS, DMPA, and KH-792 was 6 wt%, 2.2 wt%, and 40 mol% respectively, the gloss was 3.2 GU, and the wear mass loss was only 6.6 mg, which was 64% lower than that without silicone-modified. This work could provide a new idea for the preparation of wear-resistant and self-matting coatings.