Abstract
To seek a superior builder, the effect of chelating agents on the dispersion of iron (III) oxide particles and the deposition onto nylon fabric was studied by using three phosphates; sodium phosphate (SP), tetrasodium pyrophosphate (TSPP) and pentasodium tripolyphosphate (STPP), and sodium citrate (C-Na) . The chelating action of the builders, the ζ-potentials of particle and fabric, the distribution and the diameter of coagulated particles and the amount of particles deposited onto fabric were measured in the hard water as a function of the concentration of builder under the fixed condition of pH 10 and ionic strength of 1×10-2 at 30°C.
It was found that the coagulation of particles and the deposition onto the fabric were affected by the electrical surface properties of particles due to the adsorption of chelate compound. Therefore, the substitutional builder for phosphate should be a chelating agent with high valency and superior adsorption.
