|
Title
Thermogravimetry of deposited ammonium aluminum sulfate dodecahydrate used as flame-retardant for cotton fabrics
Authors
S. M. Mostashari and S. Z. Mostashari
Received
August 13, 2009
Published
Volume 43 Issue 9-10 October-December
Keywords
ammonium aluminum sulfate dodecahydrate, Dust or Wall Effect Theory, flame-retardancy,
Abstract
The effect of ammonium aluminum sulfate dodecahydrate on the flammability of 100% cotton fabric (woven with a density of 144 g/m2) has been studied. The laundered, total dried, weighed fabrics were impregnated with a suitable concentration of aqueous ammonium aluminum sulfate dodecahydrate solutions by squeeze rolling and dried at 110 °C for 30 min. They were then cooled in a desiccator, re-weighed with analytical precision and kept under ordinary conditions overnight, prior to the fulfillment of the vertical flame test, applied for determining the specimen’s resistance to burning and flame spreading. The optimum add-on value of the salt to impart flame-retardancy to a cotton fabric ranged between 9.82 and 12.16 g anhydrous salt per 100 g fabric. Furthermore, thermogravimetry of both pure cotton and cotton treated with the above- mentioned additive, as well as of pure salt, was accomplished and their TG/DTG curves were compared and commented. The results obtained agree with the Dust or Wall Effect Theory, and with the Gas Dilution Theory.
Link
|
