Bright red disperse dye with high washing fastness and sublimation fastness and preparation method of bright red disperse dye

Abstract

The invention relates to a bright red disperse dye with high washing fastness and sublimation fastness as well as a preparation method and an application of the bright red disperse dye. The structural formula of the bright red disperse dye with high washing fastness and sublimation fastness is shown in a formula (I) which is shown in the description, wherein R1 is ethyl, allyl or benzyl; R2 is methyl, ethyl or phenyl. The dye has excellent washing fastness and is free of toxicity and carcinogenicity, resistant in irritability, safe and environmental friendly, less in discharge of three wastes, simple in synthetic process, low in cost and suitable for demand on market development and industrial production. Particularly, researches find the fact that in the presence of heteroatoms, nitrogen atoms and sulfur atoms in a benzothiazole structure, nitrogen atoms and sulfur atoms form unbonded p orbital electrons which form p-pi conjugation with pi tracks in nitrogen-nitrogen double bonds so as to enhance the stability of the nitrogen-nitrogen double bonds, so that the light fastness of dye molecules is remarkably improved.

Description

technical field [0001] The invention relates to a scarlet disperse dye with high light fastness and sublimation fastness and its preparation and application. Background technique [0002] Photofading of dyed fibers is so common that it has been studied for almost 200 years. With the emergence of various new dyes, dyeing methods and new fibers, the research on this phenomenon has become more extensive and in-depth. However, the photofading of dyes is a very complex physical and chemical change, which is difficult to explain clearly by a single or several reasons, and its internal mechanism is not very clear. It has long been considered that the structure of a dye is the main factor determining its light fastness. Therefore, dyeing and finishing workers are more concerned with the design of the molecular structure of dyes to improve the light fastness of dyes. [0003] In addition, when the fabric dyed with disperse dyes is heat treated at high temperature, the sublimation ...

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Problems solved by technology

[0005] At present, some benzothiazole-based disperse dyes have been reported. For example, Chinese patent CN201210236864.4 reports a nitrobenzothiazole-based monoazo disperse dye. However, due to the presence of strong electron-withdrawing groups on the benzene ring of the benzothiazole, the dye structure causes a blue shift in the dye. Such a red dye has too much blue light, resulting in an impure and bright red color. In order to make up for this One shortcoming, this invention has added an electron donating group (hydroxyl, alkyl, alkoxyl group, etc.) There is obvious color impurity

At the same time, this series of dyes has an electron-donating group on the benzene ring directly connected to the nitrogen-nitrogen double bond, resulting in an increase in the electron cloud density on the nitrogen-nitrogen double bond, which significantly reduces the light fastness of the dye.

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