Abstract: Because of its natural leather-like structure, microfibre synthetic leather has excellent resistance to wear, ageing, as well as cold and breathability, and is widely used in furniture and leather goods. However, microfibre synthetic leather is prone to contamination by various types of stains in use, and due to the special characteristics of furniture, etc., stain removal cannot be achieved by simple washing, so new strategies are needed to achieve easy cleaning of microfibre synthetic leather. In previous studies, temperature-sensitive hydrogel coatings were cross-linked to the surface of microfibre synthetic leather to enhance the removal of oleophilic stains by exploiting the transformation of hydrophilic and hydrophobic properties at different temperature zones, but this method was limited in its effectiveness in removing hydrophilic stains. In this study, g-C3N4 with photocatalytic properties was introduced into the hydrogel coating to effectively decompose organic compounds by using the free radicals generated during the photocatalytic process, and to enhance the roughness of the surface of microfibre synthetic leather by constructing a micro-nano structure on the surface of microfibre synthetic leather with the help of g-C3N4, so as to improve the removal efficiency of hydrophilic stains from two aspects. The experiments were carried out by using ammonium persulphate (APS) and N,N,N',N'-tetramethylethylenediamine (TMEDA) as redox initiators to completely cross-link the composite hydrogel coating containing g-C3N4 with microfibre synthetic leather. The effect of the hydrophilic treatment on the removal rate of both oleophilic and hydrophilic stains was compared. The experimental results show that the surface hydrophilic treatment of g-C3N4 can effectively enhance the removal ability of oleophilic stains, while due to the spontaneous aggregation behaviour of g-C3N4 nanoparticles, protrusions with micro-nano structures are constructed on the surface of the composite hydrogel coating, which enhances the specific surface area and enhances the g-C3N4 photocatalytic degradation effect, optimizing the removal ability of aqueous stains.
The microfibre synthetic fabrics developed are easy to clean in everyday use: oleophilic stains (e.g. cooking oil) can be removed simply by scrubbing with water. If hydrophilic stains (e.g. red wine) are present, they can be effectively degraded by photocatalytic action. As a functional fabric, it can be widely used in the design of automobiles, furniture and bags to enhance the customer experience and increase product sales, which has promising market potential. The research can provide reference for further improvement of the easy cleaning performance of microfibre synthetic leather fabrics.

Key words: microfiber synthetic leather, hybrid hydrogels, micro-nano structures, photocatalyst, efficient cleaning

摘要： 超纤合成革在日常使用过程中极易被污渍沾污，且难以清洗。通过在超纤合成革表面构筑具有微-纳结构的复合水凝胶涂层，可实现超纤合成革全效去除水性和油性污渍的效果。超纤合成革经等离子体活化处理后，将含有亲水性处理后的石墨相氮化碳（g-C3N4）的温敏聚合物单体和交联剂的混合溶液均匀涂覆于合成革表面。利用交联作用和g-C3N4纳米颗粒的可控聚集行为，在超纤合成革表面构筑具有微-纳尺寸突起结构的复合水凝胶涂层。利用K/S值表征微-纳结构与光催化作用对超纤合成革表面油性和水性污渍协同清洁效果。结果表明：借助微-纳结构的高比表面积和水凝胶良好的亲水性，协同g-C3N4的光催化特性可以极大地提升油性和水性污渍的去除率，实现改性后超纤合成革的高效清洁性能。

关键词: 超纤合成革, 复合水凝胶, 微-纳结构, 光催化, 高效清洁