One-bath desizing and dyeing process for viscose leather base fabric

Abstract

The invention discloses a one bath process desizing and dyeing technology of viscose leather base cloth. The desizing and dyeing processes of the viscose leather base cloth are finished in the same water bath. If the viscose leather base cloth is a light-color variety dyed by reactive dye, when in desizing and dyeing, the technology comprises the following steps: adding a composite desizing enzyme accounting for 1.5-3.5% of the viscose grey cloth in the weight and an anionic surfactant accounting for 0.5-2% of the viscose grey cloth in the weight into a water bath; adding an intermediate-temperature reactive dye; starting dyeing at 60 DEG C and keeping the temperature for 3-6 times; and adding sodium carbonate for color fixing in the final 2-3 times. If the viscose leather base cloth belongs to a black deep-color variety dyed by sulfur dye, when in desizing and dyeing, the technology comprises the following steps: adding a functional pretreatment agent accounting for 1-4% of the viscose grey cloth in the weight and 0.5-2% of an anionic surfactant accounting for 0.5-2% of the viscose grey cloth in the weight into a water bath; adding a sulfur dye; starting dyeing for 2-4 times at 75 DEG C; and heating to 98 DEG C and keeping the temperature for 3-6 times. The technology disclosed by the invention realizes one bath process of desizing and dyeing of the viscose leather base cloth, reduces the production time of the viscose leather base cloth, improves the production efficiency and remarkably reduces the total production cost.

Description

technical field [0001] The invention relates to the field of production and preparation of leather base cloth, in particular to a one-bath desizing and dyeing process for viscose leather base cloth. Background technique [0002] At present, the environment of the leather base cloth industry is not good, and the country has higher and higher energy consumption indicators for printing and dyeing enterprises. At the same time, the basic quality requirements of the market for viscose leather are rising. At the same time, the pursuit of low-energy, high-efficiency production processes is the only way to survive in the market. Although there are many new processes for one-bath desizing and dyeing on the market, due to the impact of garment leather on the feel, shrinkage, peeling, and Special requirements such as physical properties are high, so there has been no one-bath desizing and dyeing process that meets the requirements of viscose leather base fabrics. [0003] 1. When weav...

AI Technical Summary

Problems solved by technology

[0002] At present, the environment of the leather base cloth industry is not good, and the country has higher and higher energy consumption indicators for printing and dyeing enterprises. At the same time, the basic quality requirements of the market for viscose leather are rising. At the same time, the pursuit of low-energy, high-efficiency production processes is the only way to survive in the market. Although there are many new processes for one-bath desizing and dyeing on the market, due to the impact of garment leather on the feel, shrinkage, peeling, and The special requirements such as physical properties are high, so there has been no one-bath desizing and dyeing process that meets the requirements of viscose leather base fabrics

[0003] 1. When weaving viscose gray cloth, it is necessary to sizing the warp yarn, mainly because the weaving factory wants to better weave the cloth. If it is not properly desized, it will be stained during dyeing. At the same time, the cloth body is very hard and cannot meet the product quality requirements. , all desizing processes must be performed

[0004] 2. The disadvantages of the current two-bath process of desizing and dyeing are mainly that there are many processes and long time consumption, resulting in low production efficiency and high labor costs. At the same time, water, electricity, steam consumption and sewage discharge are large, resulting in high production costs.

[0005] 3. The desizing and dyeing one-bath process currently on the market cannot be used on viscose leather base fabrics

For example, when producing light-colored and colored varieties, viscose fibers are generally dyed with medium-temperature reactive dyes (dyeing at 60°C) or direct blended dyes. When producing direct blended dyes, its pH value exceeds 10.5 (using more than 1.5% of the weight of viscose gray cloth), which cannot meet the pH conditions of the dye bath for direct dyes; The bath cannot meet the desizing process temperature requirements of the desizing agent, and the production will easily affect the dyeing stability of the reactive dyes, which will easily cause color difference and cannot realize the one-bath process of desizing and dyeing; when producing dark varieties, due to its dyeing depth Restricted by the dyeing machine, especially for the color of extra deep black, the dyeing depth of other dyes cannot reach the dyeing effect of sulfur black, so only sulfur dyes can be used, but after adding desizing agent or other reagents, the dyeing process of sulfur black dyes is directly Affected, it is easy to color and flower, and the effect of desizing is poor, the hand feels hard, and it cannot be used