Printing Technology Of Cotton Fabric With Reactive Dyes And Slurry Catalytic Printing

Reactive / neutral dyes were studied.

Catalytic fixation with dicyandiamide.

The effects of dosage of dicyandiamide, alkali agent and steaming time on the properties of cotton brocade printing were analyzed.

The results show that the dicyandiamide catalytic fixing technology solves the problem that the pH value of cotton fiber and nylon fiber is dyed when printed cotton brocade, and realizes the dyeing of cotton and nylon fibers with reactive dyes and neutral dyes under weak alkaline conditions.

Cotton and nylon blended or interwoven products not only have high wear resistance and strength, but also have the advantages of 2 kinds of fibers, and have excellent wearability. Their dyed products have been popular in the market for several years.

However, its printing products have been difficult to meet the needs of the market due to technical reasons.

It is difficult to produce cotton brocade printed fabrics. Acid dyes are used to dye polyamide and reactive dyes are applied to cotton.

Under acidic conditions, reactive dyes basically do not stain cotton fibers, and reactive dyes must be fixed under alkaline conditions. However, the dyeing rate of acid dyes on nylon is very low when alkaline conditions are applied. A large number of dyes washed by water will stain each other between cotton and nylon, not only affecting the color fastness of printing, but also contaminate printing and white, and affect the quality of products.

Domestic researchers have used R and KE reactive dyes to cotton brocade dyeing and printing. Neutral conditions are used to fix the color and avoid the damage of nylon handle under alkaline conditions.

Neutral dye fixing reactive dye ArgazolNF is also used to dye all cotton, polyester cotton and cotton brocade products. The fastness of the products is qualified, the process is simple and the cost is low, but the chromatographic products are not enough at present.

In recent years, with the development of cellulose fiber (cotton, viscose and new regenerated cellulose fiber), reactive dyes have become one of the most important dyes for dyeing and printing of cellulose fibers. However, the most prominent problem of reactive dyes is the low exhaustion rate and low fixation rate. A large part of them must be washed away, which not only increases the dye consumption, but also increases the cost.

Foreign countries have invested a lot in developing environmentally friendly printing technology, energy saving and water-saving technologies and equipment.

A large number of research works have been carried out by Donghua University and other research institutes in China.

In this study, the same pulp catalytic printing technology of cotton brocade interwoven fabric was discussed.

In printing, low yield, color difference before and after, low color fastness, white spot contamination and the difference of cloth effect caused by the difference between 2 kinds of fibers, we produce high-grade cotton fabric with high quality, light weight, wear-resistant and comfortable clothing.

The research project has passed the appraisal of new industrial products in Zhejiang province.

Experimental materials.

Cotton brocade (70: 30) interwoven fabric (warp 55.5dtex nylon filament, 980 /10cm, weft yarn of 18.2tex (32S) cotton, 270 /10cm, fabric weight 136g/m2, Zhejiang Jiaxin Hsing Chang printing & Dyeing Co., Ltd.), reactive dye M-3R, reactive dye M-3BE, reactive dye M-2GE.

Printing prescriptions: reactive dyes M-3R2.5g, reactive dyes M-3BE3.0g, reactive dyes M-2GE1.5g, neutral yellow 0.1g, neutral Brown 0.5g, urea 5g, sodium bicarbonate XG, anti salt S1g, dicyandiamide YG, sodium alginate paste (5%) 60g, total pigment printing process: toning paste, printing, drying, steaming (heating temperature), hot water washing, soap washing, cold water washing and drying.

Neutral dye fixation.

In order to improve the color fastness of printed fabrics, a fixative RFC was used to fix the color after washing.

The fixing conditions are: fixing agent RFC5~30g/L, acetic acid 0.5g/L, baking temperature at 101~102, 2min.

Test.

The K/S value was tested by Color-Eye7000A computer color matching (AmericanGretagMacbethLtd).

The dye uptake rate (E) is calculated according to formula (1): E (%) = (K/S) 1/ (K/S) 2 * 100%. formula: (K/S) 1, (K/S) 2 is the amount of color before and after printing and washing under lambda max.

Dyeing fastness test of dyed fabric: rubbing fastness according to the test method of GB3920-1997 textile's color fastness to rubbing fastness, the washing fastness of GB/T3921.3-1997 textiles is colour fastness to washing.