Abstract
Dyeing and fastness properties of a series of 4-fluorosulfonylphenylazo-5-pyrazolone dyes on polyester were investigated in this study. The 4-nitrophenylazo-5-pyrazolone dyes were also synthesized to compare their dyeing and fastness properties on polyester with those of fluorosulfonyl-substituted analogues. The substantivity of 4-arylazo-5-pyrazolone derivatives containing a p-fluorosulfonyl group in the diazo component was lower than that of their nitro analogues which have a higher extinction coefficient and higher affinity because of the polar nitro group. They showed relatively hypsochromic color and lower chroma on polyester compared with their nitro analogues because of the relatively weaker electron-accepting power of the fluorosulfonyl group compared to the nitro group. Disperse dyeing of polyester with 4-fluorosulfonylphenylazo-5-pyrazolone disperse dyes achieved high color fastness and reduces the adverse environmental impact of the dyeing process by providing the option of performing alkali clearing instead of reductive clearing, which has high biological oxygen demand when discharged into the dyeing effluent and generates carcinogenic aromatic amines.
Highlights
Polyester, polyethylene terephthalate (PET), is the most widely used material in the textiles industry because of its excellent physical properties, processability, lower price, etc., [1]
Azo disperse dyes containing a fluorosulfonyl group hydrolyzed under alkaline conditions to water-soluble containing a sulfonate group investigated in our mild previous studies
It is presumed that azo disperse dyes incorporating fluorosulfonyl group can be hydrolyzed under alkaline conditions to high-washable dyes containing a sulfonate group without breakage of the azo linkage, and they can be washed off (Scheme 2)
Summary
Polyethylene terephthalate (PET), is the most widely used material in the textiles industry because of its excellent physical properties, processability, lower price, etc., [1]. Azo disperse dyes containing a fluorosulfonyl group hydrolyzed under alkaline conditions to water-soluble containing a sulfonate group investigated in our mild previous studies [11,12,13,14,15]. Azo disperse dyesdyes containing a fluorosulfonyl hydrolyzed under mild alkaline conditions to water-soluble dyes containing a sulfonate group without scission of mild the azo linkage and couldtobewater-soluble washed-off. AThe hydrolysis of hydrolyzed under alkaline conditions dyes (Scheme containing sulfonate group without scission of the azo linkage and could be washed-off (Scheme 2). VeryHowever, little information is components yellow to orange azo dyes in the textiledisperse dyeing industry since the of 4-fluorosulfonylphenylazo-5-pyrazolone disperse dyes [15], very little information is available in available in their application to polyester.
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