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Synthesis and Dyeing Properties of Red Disperse Dyes Derived from Diaminopyridines  

Park Jong Ho (Department of Textile Engineering, NITRI, Konkuk University)
Koh Joonseok (Department of Textile Engineering, NITRI, Konkuk University)
Bae Jin Seok (Korea Dyeing Technology Center)
Kim Sung Dong (Department of Textile Engineering, NITRI, Konkuk University)
Publication Information
Textile Coloration and Finishing / v.17, no.6, 2005 , pp. 1-10 More about this Journal
Abstract
Disperse dyes derived from heterocyclic compounds such as phenylindole, pyridone, diaminopyridine, and carbazole have been known to exhibit high light fastness and bathochromic shift compared to the coursponding aminoazobenzene. The synthetic method to obtain diaminopyridine derivatives, which can be used as coupling components, was chlorination of pyridone with phosphorous oxychloride, followed by substitution with various primary amines. Four azo disperse dyes were synthesized by coupling four diaminopyridines with 2-cyano-4-nitroaniline as a diazo component. Structures of these dyes were confirmed by $^1H$ NMR spectroscopy. The wavelengths of maximum absorption of the synthesized disperse dyes were in the range of $517\~528nm$, and molar extinction coefficients were $45,700\~50,100$. The dyeability of four disperse dyes toward PET fiber was generally good. Wash and rubbing fastnesses were excellent, while light and dry heat fastness were good.
Keywords
diaminopyridine; coupler; disperse dye; dyeing; PET; colorfastness;
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