基于界面模板聚合的长效防霉/自清洁双功能酪素基纳米杂化微胶囊皮革涂饰材料

Natural product casein is used as the matrix and modified via the microemulsion interface template polymerization using polymeric micelles as the template. By employing the block copolymer as the polymer micelle template, polyacrylate core layer, inorganic titanium dioxide corer layer and casein shell layer can be formed, thereby gaining a multi-layered core-shell structural casein-based titanium dioxide nano-hybrid microcapsule emulsion. On this basis, the microcapsule technology is used for encapsulation of the fungicide, thus obtain fungicide-encapsulated nano-hybrid microcapsule emulsion. On the one hand, the existence of nano-titanium dioxide layer will play a certain barrier function on the release of the fungicide; on the other hand, under UV irradiation, nano-titanium dioxide helps build super hydrophilic surfaces, which have the self-cleaning effect of dirt. Therefore, this hybird emulsion used in leather finishing is expected to give long-term anti-mold coating and also a self-cleaning coating. To reveals the stabilizing mechanism of the hybrid nano-capsules; To explore the relationship among synthesis parameters, microscopic structure and comprehensive performance of the microcapsule emulsion; To find out the mechanism of encapsulation and slow--release of the fungicide based on the hybrid coatings; To explore the mechanism of self-cleaning for microcapsules coating. This study of new functional development of leather finishing agent will have important theoretical guiding significance, and has a positive promoting role in enhancing the added value of leather products, thus increasing the competitiveness of China's leather industry.

以天然产物酪素为基材，高分子胶束为模板，基于微乳液界面模板聚合法，在基材中引入聚丙烯酸酯链段核层、无机二氧化钛中间层和酪素壳层，获得具有多层核壳结构的酪素基二氧化钛纳米杂化微胶囊乳液。在此基础上，采用微胶囊技术对防霉剂进行包覆，获得内部包覆防霉剂的纳米杂化微胶囊乳液。一方面，纳米二氧化钛中间层的存在对防霉剂的释放起到了一定的阻隔作用；另一方面，在紫外光照射下，纳米二氧化钛的引入有助于构筑超亲水表面，从而起到污物进行自清洁的作用。因此，将该乳液应用于皮革涂饰，有望赋予涂层长效防霉与自清洁双功能特性。揭示杂化纳米微胶囊的稳定机制；探究微胶囊乳液合成参数、微观结构与综合性能之间的关系；建立微胶囊涂层对防霉剂等的包覆机理与缓释机理；探究微胶囊涂层的自清洁机理。该研究将对新型功能皮革涂饰剂的开发产生重要的理论指导意义，对提升皮革制品的附加值，增加我国皮革行业竞争力具有积极的促进作用。

本项目主要以天然产物酪素为基材，高分子胶束为模板，分别采用pickling乳液聚合法、界面聚合法获得具有多层核壳结构的酪素基TiO2纳米杂化微胶囊乳液。一方面，纳米TiO2中间层的存在对防霉剂的释放起到了一定的阻隔作用；另一方面，在紫外光照射下，纳米TiO2的引入有助于构筑超亲水表面，从而达到自清洁的效果。在此基础上，采用微胶囊技术对香精和防霉剂进行包覆，获得包覆香精和防霉剂的纳米杂化微胶囊乳液，分别制备出缓香/抗菌双功能、缓释防霉/自清洁双功能酪素基微胶囊型皮革涂饰材料。此外，基于界面聚合法的研究，拓展研究了缓香型壳聚糖基SiO2微胶囊皮革涂饰材料。项目主要揭示了酪素基杂化纳米微胶囊的稳定机制；探究了微胶囊乳液合成参数、微观结构与综合性能之间的关系；建立了微胶囊涂层对防霉剂和香精的包覆机理与缓释机理；揭示了乳液涂层的自清洁机理和缓释防霉机理。该研究将对新型功能皮革涂饰材料的开发产生重要的理论指导意义，对提升皮革制品的附加值，增加我国皮革行业竞争力具有积极的促进作用。也对其他领域功能涂层的开发具有一定的指导意义。