Dark blue disperse dye and application thereof

Abstract

The invention discloses a dark blue disperse dye which comprises, by weight, 7-9% of component A, 3-4.5% of component B, 40-43% of component C, 29-33% of component D, and 14-20% of component E, the weight percentages of the components are 100% in total. As the components of the dark blue disperse dye are not easy to pollute fibers, a process of reduction washing for pure polyester is omitted when the dark blue disperse dye is applied to dyeing of polyester and spandex blended textile, and color fastness requirements can be met by one alkali reduction on the polyester and spandex blended textile, at least one barrel of water can be saved, emission of waste water is reduced, and the purpose of environmental protection can be achieved.

Description

Technical field [0001] The invention relates to the field of preparation of disperse dye compositions, in particular to a disperse dark blue dye suitable for dyeing polyester and spandex blended fabrics and its application. Background technique [0002] In recent years, various countries and regions have successively promulgated various laws and regulations on environmental protection. Our country has also determined the basic national policy of saving resources and protecting the environment, and has put forward higher requirements for the dyeing and finishing industry with high energy consumption and large pollution. The application of traditional high fastness disperse dyes to pure polyester dyeing must undergo at least one reduction wash, and the application of polyester and spandex blended fabrics requires at least two reduction washes to meet the fastness requirements. [0003] At present, the common disperse dark blues on the market mainly include disperse dark blue 79, disp...

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Problems solved by technology

[0003] The common disperse dark blue currently on the market mainly includes disperse dark blue 79, disperse dark blue 291, etc. Due to the stable structure of these conventional dyes, it is not easy to clean, resulting in poor color fastness, which must rely on repeated reduction washing to improve the fastness. (There are two methods of reduction washing: ①alkaline washing: adding sodium hydrosulfite and caustic soda; ②acid washing: adding acidic reducing detergent and acetic acid). To achieve better fastness, at least one reduction washing is required for polyester; The fabric needs at least two reduction washings, which prolongs the dyeing time, increases the cost, and increases the discharge of dyeing wastewater

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