Strong Lewis Acid Salts as Catalysts in Mild-Cure Finishing Treatments for Wrinkle Resistance

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Abstract
Lewis acid salts have been investigated in place of mineral acids as catalysts for wrinkle resistance treatments of cotton fabric with dimethylol methyl carbamate under mild-cure finishing conditions. Salts that are strong Lewis acids, such as aluminum chloride, aluminum nitrate, aluminum sulfate, and stannic chloride, produced finishes essentially equivalent to those of mineral acid catalysis when curing was conducted at 100°C. With curing at 60°C, however, the mineral acids are much more effective catalysts. Zinc chloride, zinc nitrate, and magnesium chloride, the catalysts widely used in con ventional pad-dry-cure finishing treatments, are weaker Lewis acids and are not suitable for mild-cure finishing.

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