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.
Wang Liang,Chen Qun,Zuo Shixiang,Yao Chao,Li Xiazhang,Liu Wenjie,Zhou Ming
Attapulgite/graphene conductive composite is modified by a silane coupling agent of N -(β-aminoethyl)-γ-aminopropyltrimethoxy-silane (KH-792) to make conductive attapulgite uniformly load on the surface of the graphene. The samples are characterized by X-ray diffraction, transmission electron microscopy and Fourier transform infrared spectroscopy. The results demonstrate that the conductive attapulgite is successfully grafted onto the surface of graphene. The characteristics of raw and modified absorbents are characterized by Fourier transform infrared spectroscopy, thermal analysis, scanning electron microscopy and transmission electron microscopy. The results show that the saturated mass fraction of the surface-adsorbed KH-792 silane coupling agent is about 3.0–5.0%. The electrical conductivity and mechanical properties of the conductive coating prepared from the modified conductive composite are investigated. The results show that the surface resistivity of the modified attapulgite/graphene conductive composite coating is smaller than that of the unmodified attapulgite/graphene conductive composite coating when the same amount of is added, and the mechanical properties are also greater than unmodified. As a comparison, when the composite material is 15% mass of the paint which can achieve a best performance.
危险品化学品经营许可证（带存储）