A kind of lignin-based nano disperse dye and preparation method thereof

Abstract

The invention relates to a lignin-series nano-grade disperse dye and a preparation method thereof. The method comprises the steps of active intermediate preparation, dispersant water solution preparation, solid nano-grade disperse dye preparation, and the like. The nano-grade disperse dye provided by the invention has an average particle size of 70nm. After high-temperature treatment, an average particle size is 145nm. The dye has good high-temperature stability and a dye uptake rate higher than 90%. According to the invention, the dispersant dose is greatly reduced, and subsequent wastewater treatment cost is reduced. The nano-grade disperse dye provided by the invention is in a form of dispersion liquid or solid particles, and can be used for dyeing without a dispersant. Also, a problem of dye participle agglomeration caused by long-time storage is avoided.

Description

【Technical field】 [0001] The invention belongs to the technical field of nanometer disperse dyes. More specifically, the present invention relates to a lignin-based nano-disperse dye, and also relates to a preparation method of the lignin-based nano-disperse dye. 【Background technique】 [0002] With the rapid development of fibers, especially synthetic fibers, disperse dyes for dyeing polyester, nylon, spandex and other fibers are also developing rapidly. As of 2010, disperse dyes accounted for more than 60% of my country's total dye output. [0003] The particle size of disperse dyes directly affects the dyeing quality. During the dyeing process, the disperse dye enters the fiber gap and dissolves into a single dye molecule, so the disperse dye is dyed on the fiber surface. Due to the strong hydrophobicity of polyester fiber, high degree of crystallization and alignment, and difficulty in wetting and puffing, the micropores of the fiber are small. To realize the dyeing o...

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Problems solved by technology

[0006] The nano-dye products described in the patent application or thesis are relatively single, and basically adopt the "top-down" method, such as the action of mechanical external forces such as ball milling, the prepared disperse dyes have relatively large particle sizes, and the particle size distribution is relatively large. Inhomogeneous, especially in the preparation process, the amount of dispersant is large. After the dyeing process, a large amount of dispersant remaining in the wastewater increases the water pollution and the cost of treatment. The prepared products are basically in liquid form. Due to Due to the limitations of the molecular structure of the dispersant and the dye, the dispersant and the dye will be separated, resulting in the re-aggregation of the dispersed particles, the particle size becomes larger, and the dispersion stability of the system decreases

[0007] The dispersant used in the patent application and literature is a compound dispersant of naphthalene series and sodium lignosulfonate, which is too hydrophilic, and the adsorption strength of the dye is weak, so a large amount of emulsifiers and surfactants still need to be added. and many more

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