US 2021/0363353 A1Published application

Method for Improving Alkali Resistance and Oxidation Resistance of Benzisothiazole Disperse Dye

AssigneesQingdao University, Penglai Jiaxin Dye Chemical Co., LTD

InventorsChanghai XU, Xiaoyan WANG, Liang HE, Mingtao QIU, Xinting ZHAO, Jinmei DU, Jinglin TANG

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Abstract

The disclosure relates to a method for improving the alkali resistance and oxidation resistance of a benzisothiazole disperse dye, and belongs to the technical field of textiles. In the disclosure, azo alkali-resistant disperse dyes with benzisothiazole as a diazo component are synthesized based on structural design of the dyes, the alkali resistance and oxygen bleaching resistance of the heterocyclic azo disperse dyes are improved by introducing different groups to a coupling component, a series of benzisothiazole disperse dyes having gradient differences in alkali resistance and oxidation resistance are obtained, disperse dyes capable of meeting requirements of a one-bath process for cotton bleaching and disperse dyeing of a polyester-cotton blended fabric or a one-bath process for alkali deweighting and disperse dyeing of polyester fabrics are determined, and a reference can be provided for structural design of disperse dyes with alkali resistance and oxidation resistance.

Claims9

Dependent claims

A method for preparing benzisothiazole disperse dyes different in alkali resistance, comprising:

achieving a difference in alkali resistance by adjusting groups of a structural formula of the benzisothiazole disperse dyes;
and obtaining an alkali resistance sequence of the disperse dyes after different groups are introduced,
wherein the structural formula of the benzisothiazole disperse dyes is shown in Formula 1:
and in Formula 1, R1 is hydrogen, methyl, ethyl, methoxy or ethoxy;
R2 and R3 are each independently linear or branched alkyl, hydroxyalkyl, cyanoalkyl, cyanoalkoxyalkyl, phenyl, benzyl, alkylphenyl or alkylbenzyl;
and alkyl groups involved are all C1-4 alkyl groups;
on the basis that R1 is hydrogen, methyl, ethyl, methoxy or ethoxy and R2 is linear or branched alkyl, the alkali resistance of a benzisothiazole disperse dye obtained when R3 is benzyl, phenyl, alkylphenyl or alkylbenzyl>the alkali resistance of a benzisothiazole disperse dye obtained when R3 is alkyl>the alkali resistance of a benzisothiazole disperse dye obtained when R3 is cyanoalkyl, cyanoalkoxyalkyl or hydroxyalkyl;
and
on the basis that R1 is hydrogen, methyl, ethyl, methoxy or ethoxy and R2 is cyanoalkyl or cyanoalkoxyalkyl, the alkali resistance of a benzisothiazole disperse dye obtained when R3 is benzyl, phenyl, alkylphenyl or alkylbenzyl>the alkali resistance of a benzisothiazole disperse dye obtained when R3 is alkyl.

6 more elements

A method for preparing benzisothiazole disperse dyes different in oxidation resistance when pH=10, comprising:

achieving a difference in oxidation resistance by adjusting groups of a structural formula of the benzisothiazole disperse dyes;
and obtaining an oxidation resistance sequence of the disperse dyes after different groups are introduced,
wherein the structural formula of the benzisothiazole disperse dyes is shown in Formula 1:
and in Formula 1, R1 is hydrogen, methyl, ethyl, methoxy or ethoxy;
R2 and R3 are each independently linear or branched alkyl, hydroxyalkyl, cyanoalkyl, cyanoalkoxyalkyl, phenyl, benzyl, alkylphenyl or alkylbenzyl;
and alkyl groups involved are all C1-4 alkyl groups;
on the basis that R1 is hydrogen, methyl, ethyl, methoxy or ethoxy and R2 is linear or branched alkyl, the oxidation resistance of a benzisothiazole disperse dye obtained when R3 is benzyl, phenyl, alkylphenyl or alkylbenzyl>the oxidation resistance of a benzisothiazole disperse dye obtained when R3 is cyanoalkyl, cyanoalkoxyalkyl or hydroxyalkyl;
and
on the basis that R1 is hydrogen, methyl, ethyl, methoxy or ethoxy and R2 is cyanoalkyl or cyanoalkoxyalkyl, the oxidation resistance of a benzisothiazole disperse dye obtained when R3 is benzyl, phenyl, alkylphenyl or alkylbenzyl>the oxidation resistance of a benzisothiazole disperse dye obtained when R3 is alkyl.

6 more elements

Dependencies are inferred from the claim text.