Nanoscale red liquid disperse dye and preparation method thereof

Abstract

The invention relates to a nanoscale red liquid disperse dye and a preparation method thereof, the disperse dye comprises the following components by weight: 20%-40% of a raw dye, 5%-30% of a dispersant, 2%-10% of a stabilizer, 1%-5% of a humectant, 0.3%-3% of a preservative, 0-3% of a solvent and the balance of water. The preparation method comprises the following steps: realizing dye crystal form transformation through a dye crystal transformation technology, pulping and grinding the crystal-transformed disperse dye, adding an auxiliary agent for dispersing, and adjusting the strength to prepare the nanoscale red liquid disperse dye. The product has the advantages of small particle size, good stability, high washing-free soaping fastness, great reduction of dyeing COD and the like; and the preparation method of the dye is simple in process, safe to operate, low in cost and easier for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of disperse dye research, in particular to a nano-scale red liquid disperse dye and a preparation method thereof. Background technique [0002] my country is the largest producer of dyes, with an annual output of about 900,000 tons, of which disperse dyes account for 40% to 50%. The commercialization of disperse dyes is to add dispersants to the original dyes, and then prepare powdered dyes through calibration, filtration, and spray drying. Due to the large amount of conventional powder dye dispersants, accounting for about 40% to 70% of the system, resulting in printing and dyeing wastewater COD remains high, and the color fastness and dyestuff utilization rate are low. Compared with traditional powdered disperse dyes, liquid disperse dyes have the advantages of good dispersing effect, cost saving, and greatly reducing COD and dust pollution of printing and dyeing wastewater. At the same time, liquid disperse dyes ...

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Problems solved by technology

[0003] However, most companies currently simply use traditional dispersants to liquefy powder dyes, resulting in obvious shortcomings in liquid disperse dye products: ①The particle size of the dye is relatively large, basically above 2 μm, and the uneven distribution leads to poor storage stability. It is easy to precipitate, so that the concentration of dyes in the upper and lower layers is not uniform; ② long-term storage of dye particles is prone to secondary agglomeration, which makes the particle size larger and affects the dyeing performance; ③ traditional dispersants such as MF, NNO, and sodium lignosulfonate are still used. The improvement of dyeing performance is not obvious; ④ There is no obvious advantage in the application of anhydrous and less water dyeing printing and short process dyeing process

[0005] However, the following problems still need to be further solved in the nano-dye at present: ① the nano-processing energy consumption is high, the efficiency is low, and the production cost is high; Agglomeration, easy to micronize the particle size and affect storage stability; ③Need to add a large amount of grinding aids, which will affect the shade and performance of the dye

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