The reason why the wet rubbing fastness of flame retardant fabrics fails – reactive dyes
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fabric yarn flame retardant
The wet rubbing fastness of flame-retardant fabrics dyed with reactive dyes in deep and dense colors is one of the problems that hinders the improvement of the quality of flame-retardant fabrics. This article discusses the reasons for unqualified wet rubbing fastness, the selection of dyes and auxiliaries, the rationalization of dyeing and finishing processing techniques and testing methods, and puts forward some opinions to attract ideas, with a view to jointly solving the problem.
The main reasons for the unqualified wet rubbing fastness of deep-concentrated flame-retardant fabrics with reactive dyes are: floating color transfer of water-soluble dyes and mechanical friction transfer of colored fiber particles (10-40 nanometers). The wet rubbing fastness of dyed cloth refers to rubbing a wet white cloth with a dyed cloth sample according to specified conditions. The staining degree on the white cloth is compared with the standard gray staining sample card to evaluate, that is, the dye molecules and colored fiber particles. Degree of transfer to test white cloth through interface contact. Under the conditions of the same fabric, the same dye and the same pre-treatment and dyeing process, the darker the color, the worse the wet rubbing fastness.
The water-soluble gene in the reactive dye molecule is beneficial to the dissolution and dyeing of the dye, but it becomes a negative factor in the wet rubbing fastness of dyed fabrics. Due to the presence of aqueous medium on wet white cloth, reactive dyes tend to leave the fabric and enter the aqueous medium.
The correct selection of dyes and reasonable dyeing and finishing processes are also important links in improving wet rubbing fastness. The smoother the surface of the fabric, the higher the wet rubbing fastness, so the singeing must be clean while also reducing colored fiber particles.
The key is to wash out floating dyes. The degree of washing out of floating dyes is related to their directness to the fiber. Among them, the more direct ones are vinyl sulfone-based dyes, which are more difficult to wash out; followed by hydrolyzed dyes, which are not The reacted β-sulfate ethyl sulfone dye is less direct due to the presence of a sulfate water-soluble group, and is a floating dye that is easier to remove.
Water quality is a very important factor. If the water hardness is high, the water-soluble base of the floating dye will form a lake that is insoluble in water, seriously affecting the removal of the floating dye. The drying method is also very important. The amount of dye molecules transferred in contact drying is ions, while non-contact drying.
：Textile
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