Development of a NMP-free paint stripper

我们的工业合作伙伴GreenSolv正在销售一种脱漆剂AeroStrip 274 WL，其中含有N-甲基-2-吡咯烷酮（NMP）。它用于去除金属件上的油漆涂层，以便翻新和重复使用。然而，NMP（CAS 872-50-4）在欧洲几乎被禁用，在加州也不受欢迎。美国海军、庞巴迪、普惠、波音等大公司正在寻找一种不含NMP的脱漆剂，它可以像AeroStrip 274 WL一样有效。该项目的目标是制造一种新产品AeroStrip 294 WL，一种不含NMP的脱漆剂。 在佛罗里达的科学材料国际公司（SMI）根据MIL-PRF-83936 C（美国空军）对飞机轮子、起落架部件和其他飞机和支持设备进行的一系列测试中，结果表明AeroStrip 294 WL会对铝、镁和钢制成的金属件造成过度腐蚀和氢脆。显然，AeroStrip 294 WL的当前版本对于航空航天工业来说是不可接受的。 了解NMP在AeroStrip 274 WL配方中的作用至关重要。NMP在去除油漆涂层方面起着决定性的作用，通过渗透油漆层并通过使油漆溶胀来破坏油漆与物体之间的结合。然而，NMP在延缓/防止金属件的腐蚀和氢脆方面也起着关键作用。了解NMP与金属件腐蚀和氢脆之间的联系以及如何补救AeroStrip 294 WL中缺少NMP的意外影响至关重要。该项目将通过详细评估NMP、溶液pH值和溶液碱度在镀镉钢、铝和镁等金属试样氢脆中所起的作用来解决这些问题。

Our industrial partner, GreenSolv, is marketing a paint stripper, the AeroStrip 274WL, which contains N-Methyl-2-Pyrrolidone (NMP). It is used to remove paint coatings from metallic pieces so that they could be refurbished and reused. However, NMP (CAS 872-50-4) is almost banned in Europe and frowned upon in California. Large corporations such as the US Navy, Bombardier, Pratt & Whitney, Boeing & others are looking for a NMP-free paint stripper that could be as effective as the AeroStrip 274WL. The objective of this project is to make a new product, the AeroStrip 294WL, a NMP-free paint stripper. In a series of test performed by Scientific Material International, Inc (SMI) in Florida, in accordance with MIL-PRF-83936C (USAF) for aircraft wheels, landing gear components and other aircraft and support equipment, it was shown that the AeroStrip 294WL was causing excessive corrosion and hydrogen embrittlement on metallic pieces made of aluminium, magnesium and steel. Clearly, the current version of the AeroStrip 294WL is not acceptable for the aerospace industry. It is critical to understand the role NMP is playing in the formulation of the AeroStrip 274WL. NMP plays a determining role in removing paint coatings, by penetrating the layers of paint and breaking the bond between the paint and the object by swelling the paint. However, NMP is also playing a critical role in retarding/preventing corrosion and hydrogen embrittlement in metallic pieces. It is critical to understand the link between NMP and the corrosion and hydrogen embrittlement of metallic pieces, and how to remediate to this unexpected effect of the absence of NMP in the AeroStrip 294WL. This project will address these issues through a detailed evaluation of the role played by NMP, solution pH and solution alkalinity in the hydrogen embrittlement of metal coupons such as cadmium coated steel, aluminium and magnesium.