Levelling agent and preparation method and application thereof

Abstract

The invention relates to a levelling agent and a preparation method and an application thereof. A structural formula of the levelling agent is as shown in the following specification, wherein n is a number between 5 and 10. The levelling agent has the good film-forming property, and contains abundant ester groups, and is capable of combining with dye through a hydrogen bond, thereby uniformly carrying the dye to the surface of fabric and forming a film in uniform thickness, enabling the dye to be uniformly adhered to the fabric, and preventing the non-uniform dispersion because of the short contact time of the dye and the fabric. In addition, the film can also prevent migration and sublimation of the dye in a drying and color development process, and the chromatic aberration of a warp direction, a weft direction and positive and negative faces of the fabric is prevented. The levelling agent is suitable for continuous padding-type dyeing and coating-type dyeing. Compared with vat dyeingin high-temperature and high-pressure, the energy consumption can be reduced, the dyeing efficiency is improved, and the product quality is improved, the color fastness of the fabric and the color uniformity reach a A-grade level stated by a national standard, so the vat dyeing in high-temperature and high-pressure can be possibly replaced by the continuous dyeing in normal pressure and temperature.

Description

technical field [0001] The invention belongs to the technical field of textile printing and dyeing, and in particular relates to a leveling agent suitable for continuous padding or coating dyeing of polyester fabrics at normal temperature and pressure, as well as its preparation method and application. Background technique [0002] The textile industry has made great contributions to my country's economic development, and the textile printing and dyeing industry employs more than 50 million people. Up to now, it has faced very serious problems of environmental pollution and energy shortage. The daily discharge of printing and dyeing wastewater reaches 6 million tons. Not only is the composition complex and changeable, but also the concentration is high, the chroma is deep, the COD value, Cr value are large, and it also contains a variety of toxic and harmful substances, which brings great impact on wastewater treatment and standard discharge. difficulty. At the same time, t...

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Problems solved by technology

[0008] But, when this chitosan derivative dispersant is added in the dyestuff and carries out large-scale continuous dyeing under normal temperature and pressure, because the contact time of dyestuff and fabric is very short, only 10~20s, and the area of ​​fabric expands, even if Grinding disperse dyes to the nanometer range under the action of dispersants still cannot achieve the uniformity of dyeing, and it is impossible to avoid the difference in front and back colors caused by migration during drying and color development.

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