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China Surfactant Detergent & Cosmetics ›› 2022, Vol. 52 ›› Issue (6): 613-619.doi: 10.3969/j.issn.1001-1803.2022.06.006

• Development and application • Previous Articles     Next Articles

Study on the influencing factors of dye transfer inhibition in cotton fabric washing

Meng Mingzhu1,2,Zhang Zhenzhen1,2,Liang Shuaitong1,2,*(),Zhang Hongjuan1,2,Wang Jiping1,2   

  1. 1. School of Textile and Fashion Shanghai University of Engineering Science, Shanghai 201620, China
    2. Shanghai Engineering Research Center for Clean Production of Textile Chemistry, Shanghai 201620, China
  • Received:2021-08-16 Revised:2022-05-26 Online:2022-06-22 Published:2022-06-22
  • Contact: Shuaitong Liang E-mail:liangst@sues.edu.cn.

Abstract:

Dye transfer in household washing has always been a problem that disturbs people. Herein, the influences of four factors including water hardness, water amount, washing temperature and Dye transfer inhibitor (DTI) on the transfer inhibition of Direct Blue 6 on cotton fabrics were studied. The response surface method (RSM) models of the 4 factors were built. All the RSM models show that water hardness is the most significant negative factor. Based on the DLVO theory, due to the presence of Ca2+ and Mg2+, the increase of water hardness can not only reduce the zeta potential of the fabric surface, but also cause the decrease of electrostatic repulsion between Direct Blue 6 and the fabric, and thus the dye won’t go off the fabric easily, that is, the dye is more likely to be adsorbed on the surface of the fabric. The increase of water amount can enhance the dye transfer inhibition effect. When the water amount increases, the initial mass concentration of dye is decreased, and the initial dynamic pressure of washing is increased, so that the dye flows through the fabric rapidly and the deposition on the fabric is reduced. The washing temperature also has a positive effect. When the washing temperature increases, the movement speed of dye molecules is increased, and the desorption rate is greater than the dyeing rate, so the dye molecules can shed from the fiber. Within the mass concentration range of 0.3 g/L DTI, only polyvinylpyrrolidone (PVP) and its cross-linked polymer have obvious inhibition effects on dye. Polymers have many hydrophilic groups and are easy to bind with direct dyes. However, pyridine-n-oxide (PNO) and lauryl betaine are small-molecule surfactants. Their structural differences make the RSM model show that polymers have better effects. The results of quantum chemical calculation also prove that the interactions between polymers and Direct Blue 6 are greater than the interactions between PNO and Direct Blue 6 or between lauryl betaine and Direct Blue 6. In addition, there is interplay between different washing factors. This work provides necessary basic information for the optimization of washing process for cotton fabrics and the modification of DTI.

Key words: dye transfer, water hardness, water consumption, temperature, mass concentration

CLC Number: 

  • TQ423