An acid buffer having capability to neutralize Core alkali after mercerization of cotton as well as after weight reduction of polyester fabrics. Keeping in mind the ever-evolving requirements of our clients, we are manufacturing and supplying a broad spectrum of Washing Agent. it is used to remove alkali and ph control fo rnext process.
Reduction clearing using aqueous sodium dithionite under alkaline conditions at elevated temperatures is commonly carried out as an aftertreatment to remove deposits of disperse dye and other impurity residues from the surface of dyed polyester. In this paper, the effect of conventional reduction clearing on the colour and fastness properties of polyester dyed with a series of selected commercial disperse dyes at a range of depths of shade is established, and an understanding of the scientific principles is developed. The results correlate closely with an assessment of surface dye removal by cold acetone extraction of the dyed samples. Because of certain environmental, technological, and economic disadvantages associated with traditional reduction clearing using sodium dithionite, there is industrial interest in alternatives. Thus, this paper also describes a study of the use of two organic reducing agents, thiourea dioxide and hydroxyacetone, and the relative merits of the three processes are discussed. The outcome of clearing varies with the particular dye. Mechanistic explanations are proposed, based on individual characteristics of the molecular structures of the dyes. Scanning electron microscopic investigations of the surface of dyed samples before and after reduction clearing were qualitatively consistent with the assessments of the technical performance. This paper is the first in a series in which we will subsequently report further comparative studies, based on similar methodology, exploring alternative clearing processes.
A solid material dispersed in a liquid requires an additive to make the dispersion process easier and more stable – this is the role of the dispersing agent, or dispersant.
Dispersants deflocculate solids and thus significantly reduce the viscosity of a dispersion or paste. As a result of this effect, solid loading – the amount of dispersible powdered material – can be increased accordingly. The dispersion phase is possibly the most time- and energy-consuming stage of the production process. This is due to the different surface tensions of the liquids (e.g., resin, solvents) and the solids (e.g., fillers, additives). A dispersing additive is necessary to produce stable formulations and ensure storage stability (no viscosity instability, no separation).