Aluminum safe compositions for removing cured polysulfide resins
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United States of America Patent
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Feb 17, 2015
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app pub date -
Aug 15, 2012
filing date -
Aug 17, 2011
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Abstract
A metal-safe dissolving composition for cured resins, comprising a solvent blend that includes a metal safe solvent mixture with addition of a soluble alkali that exhibits a pKa value ≧12. The solvent mixture may include the preferred solvent for metal safety, gamma-butyrolactone (GBL), and the preferred soluble amine, 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU). The solvent, n,n-dimethylacetamide (DMAC) or others, are chosen for high penetration and solvency to polar resins. To this mixture, a surfactant, inhibitor, and cellulose derivative may be added to produce a gel-form property. The product may be used to remove coatings and sealants present on vertical and horizontal surfaces and hard to reach areas commonly encountered when performing maintenance on aviation fuel tanks and similar equipment. Of key importance for the remover is its safety to aluminum and aluminum alloy substrates as demonstrated by modified test methods for sandwich corrosion, for example, ASTM F1110.
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