Color fixing agent for reactive dyeing and preparation method of color fixing agent

Abstract

The invention provides a color fixing agent for reactive dyeing and a preparation method of the color fixing agent. The preparation method includes the steps: (1) sequentially adding imidazolium chloride monomers, trifluoroethyl acrylate, dihydroxyethyldiallyl ammonium chloride, acidity regulator and deionized water into a reaction kettle equipped with a thermometer, a stirrer and a reflux condenser prior to starting reflux condensation, stirring and starting heating to increase temperature; (2) when the temperature rises to 85-100 DEG C, then dropwise adding initiator solution which is 1-10% in mass concentration and prepared with initiator and part of the deionized water, controlling the dropwise adding time between 0.5 hour and 3 hours, and controlling the temperature between 85 DEG C and 100 DEG C during dropwise adding; (3) after addition, performing thermal reaction for 1-5 hours, then adding the balance water, and discharging after stirring for 0.5 hour to obtain the color fixing agent.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a color-fixing agent for reactive dye dyeing and a preparation method thereof. Background technique [0002] Reactive dyes are low in price, complete in color spectrum and bright in color, and are widely used in cotton fabric dyeing. Although the reactive groups in the reactive dye molecules are easy to bond with the fibers through covalent bonds, the color fastness is not ideal. During the dyeing process, especially when dyeing dark colors, there will often be a large amount of unfixed reactive dyes on the dyed fabric due to the high concentration of the dye. These unfixed dyes are difficult to wash off from the dyed fabric. This part The dye will fade during the washing process; at the same time, the chemical bonds formed between some active groups and fibers are easily hydrolyzed, resulting in low wet fastness. The early color fixing agents such as color fixing agen...

AI Technical Summary

Problems solved by technology

Although the reactive group in the reactive dye molecule is easy to bond with the fiber by covalent bond, the color fastness is not ideal

During the dyeing process, especially when dyeing dark colors, there will often be a large amount of unfixed reactive dyes on the dyed fabric due to the high concentration of the dye. These unfixed dyes are difficult to wash off from the dyed fabric. This part The dye will fade during the washing process; at the same time, the chemical bonds formed between some active groups and fibers are easily hydrolyzed, resulting in low wet fastness

The early color fixing agents such as color fixing agent Y are the products of reactions such as formaldehyde, dicyandiamide and ammonium chloride. Although they can improve the fastness of dyed products, they have problems such as high formaldehyde content and endanger human health. Does not meet international textile requirements

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