Performance of novel tinplate products: adhesion of polyester to new, REACH-compliant steel substrates

钢铁食品和饮料罐通常涂上一层漆，以提供更好的食品保存，并符合法律规定。这些“环氧型”漆，直到最近主要以双酚A （BPA）为基础，用于马口铁已经非常成功地使用了很多年。然而，由于最近对双酚a漆的使用（食品）安全的担忧，欧洲已经立法禁止在罐头中使用双酚a漆。Protact（塔塔钢铁公司的聚合物涂层基板）被认为是解决这些问题的最佳选择。大型投资项目正在Trostre（威尔士）和IJmuiden（荷兰）实现，以增加产量并开发这一不断增长的市场。此外，欧洲立法要求工业在生产过程中远离Cr（VI）。目前的Protact衬底是铬涂层钢（ECCS），通过Cr（VI）工艺生产。虽然最终产品是不含铬（六），ECCS需要更换，以保护工人免受接触铬（六）。为了确保合适的衬底的可用性，塔塔钢铁公司开发了一种替代衬底，称为TCCT，它本身就是EngDoc研究的一个活跃主题。然而，所有关于Protact与基质粘附的机理研究都是在ECCS上进行的，对影响TCCT粘附的因素的了解相对有限。聚酯层压板（如塔塔钢铁公司的Protact材料）非常适合解决所有当前（双酚a）和未来的食品安全问题，并且新的基材也符合REACH法规。在IJmuiden，生产线上已经安装了一个新的TCCT单元，在Trostre的投资将在不久的将来完成。随着这些大型新投资的实现，对材料性能的理解对于塔塔钢铁支持Protact在市场上的使用至关重要。本提案的主题是了解proact在食品灭菌等恶劣条件下涂层粘附性的特性，并确定材料的要求，以达到足够的产品性能。

Steel food and beverage cans are generally coated with a lacquer to provide improved food preservation and to fit with legislation. These "epoxy-type" lacquers, until recently mainly based on bisphenol A (BPA), applied to tinplate have been used very successfully for many years. However, due to recent (food) safety concerns about the use of BPA lacquers, legislation has been introduced in Europe banning its use in cans. Protact (Tata Steel's polymer-coated substrate) is seen as the perfect candidate to solve these issues. Large investment projects are being realised in Trostre (Wales) and IJmuiden (The Netherlands) to increase production volumes and develop this growing market. Furthermore, European legislation requires industry to step away from Cr(VI) during production processes. Current substrate for Protact is a chrome-coated steel (ECCS), produced via a Cr(VI) process. Although the final product is Cr(VI)-free, ECCS needs to be replaced to protect the workforce against exposure to Cr(VI). To ensure availability of the right substrate Tata Steel has developed an alternative substrate, called TCCT, itself an active subject of EngDoc research. However, all mechanistic studies on adhesion of Protact to substrate were done on ECCS, and relatively limited understanding of the factors influencing the adhesion on TCCT are clearly defined. Polyester laminates (like Tata Steel's Protact material) are uniquely suited to solve all current (BPA) and future food safety issues and with the new substrate will also comply to the REACH legislation. In IJmuiden, already a new TCCT cell has been installed in the production line, and investment in Trostre will be done in the near future. With these large new investments being realised, the understanding of the material performance is essential for Tata Steel to support the use of Protact in the market. The theme of this proposal is to understand the properties of Protact with respect to adhesion of the coating under severe conditions like food sterilisation and to determine requirements of the material to achieve sufficient product performance.