In the textile industry chain, pretreatment, as a core step before dyeing and finishing, directly affects the efficiency of subsequent processing and the quality of finished products.Pretreatment agents, as the "invisible driving force" in this step, remove fiber impurities and adjust surface properties, giving fabrics an inherent advantage in uniformly absorbing dyes and auxiliaries. Their technological evolution has always been closely intertwined with the industry's dual pursuit of quality and environmental protection.
Traditional pretreatment focuses on desizing, scouring, and bleaching to remove natural byproducts such as sizing agents, pectin, and waxes from cotton fibers, as well as oils and oligomers from synthetic fiber fabrics. Early pretreatment agents relied heavily on strong alkalis and strong oxidants for efficient impurity removal, but the problems of high energy consumption and high pollution gradually became apparent-COD (Chemical Oxygen Demand) and salt residues in wastewater not only exacerbated the environmental burden but could also damage fiber strength due to overtreatment, leading to a decrease in color fastness. With the global adoption of eco-textile standards (such as OEKO-TEX®), pretreatment agents are undergoing a transformation from "powerful cleaning" to "precise control."
Current mainstream pretreatment agents place greater emphasis on a balance between functional complexity and gentleness. For example, composite desizing enzymes developed for cotton fabrics can efficiently decompose starch sizing agents at low temperatures, reducing alkali usage; surfactant-containing compound systems can simultaneously emulsify oils and disperse impurities, avoiding water waste from multiple washes. For blended and functional fabrics (such as waterproof and flame-retardant base fabrics), pretreatment agents must also consider fiber differences, selectively penetrating to adjust interfacial tension and prevent performance imbalances caused by localized over-treatment. Furthermore, the introduction of bio-based surfactants and biodegradable chelating agents has increased the biodegradability rate of pretreated wastewater to over 90%, meeting the industry's urgent need for "carbon reduction and energy conservation."
It is worth noting that innovation in pretreatment agents is not only about optimizing technical parameters but also about adapting to the trend of intelligent production. By linking with online monitoring equipment and dynamically adjusting the agent concentration and process parameters, precise control of the pretreatment effect can be achieved, reducing human error. In the future, with breakthroughs in nanocarrier technology and biomimetic catalytic systems, pretreatment agents may further advance towards "low dosage, high activity, and zero emissions," providing a more solid foundation for the green upgrading of the textile industry.
From "impurity removal" to "empowerment," the iterative history of textile pretreatment agents is a microcosm of the industry's shift from scale expansion to quality and efficiency. It is not only the starting point for weaving high-quality fabrics but also a key fulcrum for promoting the harmonious coexistence of industry and the environment.
