Paint Recycling for End-of-Life Construction Cladding

背景：该项目将与Beckers合作开展，Beckers拥有150多年的历史，是提供独特的高质量解决方案的真正先驱，可满足许多行业的涂层需求。研究：卷材涂料的主要用途之一是建筑施工中使用的外立面面板。涂料被施加到连续的宽金属带上，然后进行热处理，以诱导凝胶化或交联。使用的化学品包括聚酯/三聚氰胺、聚氨酯、PVdF和PVC增塑溶胶等。目前，随着建筑物在使用寿命结束时从建筑物中移除覆层，金属通过熔化然后重新铸造来回收。在此过程中，卷材涂层会从金属上焚烧掉，因此会损失。目前，涂层金属板的碳足迹中很大一部分是与制造涂层的原材料生产相关的排放。因此，如果开发出一种回收这些原材料的方法，将大大减少卷材涂料的总碳足迹。项目描述：博士学位的具体重点将首先是研究和开发低碳冲击方法，化学或机械，这将有助于从基材上去除报废涂料。其次，开发一种提取可在未来卷材涂料中重复使用的组成部分的路线。这一过程将在金属回收之前进行。预期成果：开发一种从涂覆在金属基材上的暴露漆膜中提取可用卷材涂料原材料的方法。最适合回收的材料是有色或防腐颜料（特别是TiO 2）和用作粘合剂的有机聚合物。

Background:The project will be undertaken in collaboration with Beckers, which dates back over 150 years and is a true pioneer in providing unique, high-quality solutions that answer coating needs across many sectors. Research:One of the main uses of Coil Coatings is on exterior façade panels used in building construction. Coatings are applied to continuous, wide metal strip and then thermally treated so as to induce gelation or crosslinking. Chemistries used include Polyester/Melamine, Polyurethane, PVdF & PVC plastisol amongst others. Currently, as cladding is removed from buildings at the end of life the metal is recycled via melting and then re-casting. During this process the coil coating is incinerated from the metal and so is lost.Currently, a significant part of the carbon footprint of a coated metal panel is the emissions related to the production of the raw materials used to make the coating. Therefore, if a route to recover those raw materials was to be developed, this would yield a significant reduction in the total carbon footprint of the coil coating.Project Description:The specific focus of the doctorate will be firstly to investigate and develop low-carbon impact methods, chemical or mechanical, that would support the removal of the end-of-life coating from the substrate. Secondly, to develop a route to extract the constituent parts that can be reused in future Coil Coatings. This process would be carried out before the metal is then recycled.Desired outcomes:Development of a method to extract usable Coil Coating raw materials from exposed paint films that are applied to a metal substrate. The materials that would be most desirable for recovery are the coloured or anti-corrosive pigmentation (especially TiO2), and the organic polymers used as the binder.