Softening effect of bentonite and redeposition of solid impurities on washed cotton fabric
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The aim of this work is to propose a contribution to obtain an improvement in the redeposition of solid impurities on cotton fabric during washing with ecological surfactants and also the enhancement of their smoothness. For that purpose, sodium bentonite was added to the detergent formulations to produce a smoothing effect while washing, to obtain what is known as “softergent”. Thus, smoothing with this product, the necessity of adding softener in the last rinse during washing is eliminated, with the savings of softeners and time and more ecological waste water. This was possible given the excellent compatibility of the bentonite with all the components of the detergent. As a water-soluble inorganic salt, bentonite is environmentally friendly. The surfactants used in the detergent formulations were the anionic sodium dodecylbenzene sulfonate (SDBS) and the two non-ionic surfactants, APG and AE with 7 m. EO, which were used separately and in mixtures of different proportions of anionic and non-ionic surfactants. The sodium bentonite (composed mainly of silicates and aluminates) was used with two types of particle size, without surface treatment and with and without ammoniumsilicone softener treatment to show the effect on their behaviour. The redeposition behaviour on the cotton fabric and the smoothness produced after washing with bentonite microparticles in the detergent formulation, depending on use of the surfactants alone or in the different proportions of anionic:non-ionic surfactants were measured. The smoothness of cotton fabrics produced by the bentonite microparticles after washing was evaluated by hand. A relationship between handle and inorganic ash contents was established. Also, the electrical double layer of the bentonites was measured in the presence of the surfacants tested
CitationCarrion, F. Softening effect of bentonite and redeposition of solid impurities on washed cotton fabric. "Tenside surfactants detergents", Març 2014, vol. 51, núm. 2, p. 119-125.
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