Reactive Blue 21 Exhaustion Degree Investigated Using the Surface Response Methodology as an Auxiliary Tool in Cotton Dyeing

ABSTRACT

Response surface methodology was used to investigate the influences of sodium chloride (NaCl), soda ash (Na₂CO₃), and sodium hydroxide (NaOH) concentrations on cotton and the degree of exhaustion (D_E) of Reactive Blue 21 dyestuff (RB21), as well as to optimize dyeing conditions. A 2³ central composite and rotational design was used as a support to carry out 17 dyeings with RB21 on a 100% knitted cotton substrate. NaCl, Na₂CO₃, and NaOH concentrations were used as factors. Responses comprised color strength (K S^‒1) and the D_E. The results indicate that a square model was the best fit. This model was able to increase both K S^‒1 and D_E values, with the colorfastness to water and rubbing carried out with supplier’s formulation recipe. This study demonstrates that the use of the response surface methodology in color matching can contribute to the textile industry in the prediction or assessment of formulations for a specific color.

摘要

采用响应面法研究了氯化钠（NaCl）、纯碱（Na2CO3）、氢氧化钠（NaOH）浓度对棉纤维的影响，以及活性蓝21染料（RB21）的消耗程度（DE），并对染色条件进行了优化.以23中心复合旋转设计（CCRD）为载体，在100%针织棉基材上用RB21进行17次染色.以NaCl、Na2CO3和NaOH浓度作为影响因素.响应包括颜色强度（k s 1）和DE. 结果表明，方形模型最适合.该模型能够提高K S 1和De值，并根据供应商的配方进行耐水和摩擦色牢度试验.这项研究表明，在颜色匹配中使用响应面方法有助于纺织行业预测或评估特定颜色的配方.

KEYWORDS:

• Degree of exhaustion
• response surface methodology
• color strength
• cotton dyeing
• Reactive Blue 21
• textile industry

关键词:

• 疲劳程度
• 响应面方法
• 颜色强度
• 棉花染色
• 反应蓝21
• 纺织工业

Acknowledgments

The authors are grateful to CNPq, Golden Technology, and SENAI-SP Research Support Program.

Additional information

Funding

This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico.