Abstract
The feasibility of reuse waste alkali solution from rayon manufacturing process to replace solid sodium hydroxide for cotton fabric one-bath-one-step pretreatment had been investigated. Under alkaline condition, hydrogen peroxide decomposition rate could be accelerated by a little amount of cobalt chloride. To obtain a similar decomposition value of hydrogen peroxide, the required temperature for waste alkali solution was lower than that of solid sodium hydroxide, and the lower value is about 10°C. The pretreatment temperature could be reduced by 15°C when waste alkali solution was used as alkali agent to replace solid sodium hydroxide, while the treatment conditions should be strictly controlled to diminish fiber damage. According to the demands of dyeing and printing products, a desired pretreated cotton fabric could be successfully prepared when the alkali waste from rayon manufacturing process was used as substitute for solid sodium hydroxide in one-bath-one-step pretreatment of cotton fabric.
Highlights
In order to obtain bright cotton fabric for dyeing or printing and to make fabric uniformly water absorbent, a pretreatment is necessary for removal of natural and humaninduced impurities such as oil, stain, waxes, and colored mater.[1,2] Desizing, scouring with strong alkali, and bleaching are typical pretreatment steps, which are often combined to reduce energy consumption and costs.[3]
The effects of solid sodium hydroxide and waste alkali solution on the decomposition of hydrogen peroxide were compared under different alkali concentration, temperature, and time
Hydrogen peroxide bleaching should be controlled at alkali medium due to its weak acid property (Kdiss = 1.78 × 10–12 at 20°C)
Summary
In order to obtain bright cotton fabric for dyeing or printing and to make fabric uniformly water absorbent, a pretreatment is necessary for removal of natural and humaninduced impurities such as oil, stain, waxes, and colored mater.[1,2] Desizing, scouring with strong alkali (viz. sodium hydroxide), and bleaching are typical pretreatment steps, which are often combined to reduce energy consumption and costs.[3]. The effect of waste alkali solution on the hydrogen peroxide decomposition and cotton fabric properties like mechanical strength, wettability, and whiteness were investigated.
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