文献类型：期刊文献

英文题名：A Uv-Curable Polyurethane Acrylate Coating with Self-Matting, Anti-Fingerprint Properties, and High Skin-Tactile Sensitivity Via Biomimetic Self-Wrinkling Structure

作者：Sun, Yingchun[1] Liu, Ru[1] Sun, Yuhui[1] Fu, Qiuxia[2] Long, Ling[1]

第一作者：Sun, Yingchun

机构：[1] Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, 100091, China; [2] Hanqiu Intelligent Equipment Co., Ltd., Foshan, 528318, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230316772)

语种：英文

外文关键词：Biomimetics - Contact angle - Curing - Friction - Light emitting diodes - Optical properties - Photopolymerization - Polyurethanes - Structural properties - Surface roughness

摘要：Wrinkled surfaces widely exist in nature and biological surfaces, such as lotus leaves, insect epidermis, and human skin. Inspired by these natural surfaces, artificial surfaces with biomimetic wrinkled structures have been widely used to improve optical properties, wettability, and antibacterial properties. Herein, we propose a simple, fast, and large-scale strategy to fabricate stable polyurethane-acrylate coatings with biomimetic self-wrinkling structures that have a low gloss value, anti-fingerprint properties, and a high skin-tactile sensitivity. In particular, a self-wrinkling coating comprising hyperbranched polyurethane acrylate (PUA) is prepared, and a curing process involving a light-emitting diode (LED)/excimer/mercury lamp system has been proposed. By subjecting the homogeneous PUA system to UV curing, a self-wrinkling coating is spontaneously formed on the substrate surface. By adjusting the irradiation intensity in the curing system, the wavelength and amplitude of wrinkles on the coating surface are controlled to regulate the coating performance. The wavelength and amplitude of coating wrinkles are positively correlated with the energy intensity of LED and excimer lamps, while being negatively correlated with the energy intensity of mercury lamps. After the PUA coating is cured using the LED, excimer, and mercury lamps at energy intensities of 500, 30, and 300 mW/cm2, respectively, the wavelength, amplitude, and roughness of the wrinkles on the coating surface become 9.16, 0.56 μm, and 541 nm, respectively. Moreover, the water contact angle (WCA), surface energy, and friction coefficient of the self-wrinkling coatings are 104.5°, 29–30 mN/m, and 0.2–0.3, respectively; these results are consistent with those of the human skin surface. The gloss values of the self-wrinkled PUA coating at 20°, 60°, and 85° are 1.0, 4.1, and 4.1 GU, respectively, which meet the requirements for a matting coating. More importantly, the proposed coating demonstrates excellent optical properties, anti-fingerprint characteristics, high skin-tactile sensitivity, and excellent physical capabilities. Overall, this study provides a promising technique for large-scale manufacturing of self-wrinkling coatings that can be used in wood-based panels, furniture, and leather. ? 2023, The Authors. All rights reserved.