Exhaust dyeing cold pad-batch process with small bath ratio

Abstract

The invention discloses a process for dyeing cellulose fiber and fabrics blended by the cellulose fiber by using reactive dye, which adopts small bath ratio, multiple impregnation, and batch feeding to achieve the effect of even dyeing, mildly adds alkali for color fixation at low temperature, then uses a cold pad-batch mode to remedy the disadvantage of color fixation in a machine, fully ensures that the reactive dye is bonded with fiber, and greatly reduces hydrolysis reactions of the dye. The process has the advantages of reducing the pollution, saving energy sources and improving the benefit.

Description

Technical field: [0001] The invention relates to a low liquor ratio exhaustion cold pile process for dyeing textiles with cellulose fibers and their blends as raw materials with reactive dyes. Background technique: [0002] For textile fabrics composed of cellulose fibers and their blends as raw materials, reactive dyes are mainly used to dye cellulose fibers. There are two types of dyeing processes currently used: exhaust dyeing process and pad dyeing process. The advantages and disadvantages of these two processes are : [0003] 1. Exhaust dyeing process [0004] Most of the dyeing machines used are overflow jet dyeing machines. This type of dyeing machine uses a bath ratio of 1:7-10 for dyeing. The bath ratio refers to the weight of the cloth to the weight of the dyeing water. 1 kg of cloth is dyed with 10 kg of water. :10. Some manufacturers use liquid mist jet dyeing machine to dye cotton. This kind of dyeing machine dyes cotton with a bath ratio of 1:5. The common point is:...

AI Technical Summary

Problems solved by technology

What they have in common is: after the cloth enters the machine, it is connected end to end to form a large circle, and it passes through the nozzle in a rope shape, and then the dye is added, and then the inorganic salt, namely sodium sulfate or sodium chloride, is added in batches to promote dyeing, and then soda ash or sodium chloride is added in batches to promote dyeing. Soda ash-sodium hydroxide and mixed alkali are used to fix the color. After the dyeing process is completed, it is washed with water, boiled with soap to remove the hydrolyzed dye, and then washed to leave the machine. The dyeing temperature of high-temperature dyes is fixed at 80-90°C. Although the dyeing, washing, and soaping in this exhaustive dyeing process are all carried out on the same machine, and computer programming can be used to control its temperature, time and speed, it is simplified. The operation can simplify the dyeing, but there are still many disadvantages: 1. The cloth passes through the nozzle in a rope shape, and the dyes, inorganic salts, and alkalis are dissolved and injected into the spray liquid to add to the dyed cloth. Rope shape, there is always a difference between more outer layer and less inner layer when spraying dyeing liquid from the outside. Of course, through multiple sprays, the dye migration will finally reach a balance, but sometimes there will be strips of uneven depth; 2. The whole process is uniform. It is carried out on the same machine, so that we cannot choose the best fixing conditions. If the color fixing time is prolonged, the production efficiency of the dyeing machine will be reduced; It is not conducive to the adsorption of dyes. The temperature will increase the kinetic energy of the dye molecules. Even if the temperature of the dyes that have been adsorbed on the fibers is high, it can break free from the shackles of hydrogen bonds and van der Waals forces and return to the dye solution. The dyes are in: adsorption— —In the dynamic balance of returning to the dyeing solution, that is, desorption, increasing the temperature will make the dye tend to return to the dyeing solution. When alkali is added to fix the color, the chance of the dye in the dyeing solution reacting with water to become scrapped "hydrolyzed dye" is much greater than that absorbed in the dyeing solution. The dye on the fiber, so the dye fixation utilization rate of the exhaust dyeing process is not high

[0011] Although the fixation rate of the dyestuff is the highest in the cold pile color fixing process, which can reduce pollution; the utilization rate of the dyestuff is high, the amount of inorganic salt and alkali agent is small, so that the economic effect is good, so that the overall production cost is reduced, but its disadvantages are: 1. The bath ratio of the cold rolling and stacking process is very small, only 1:0.8, that is, the ratio of the cloth weight to the mixed dye solution with the belt is multiplied by 100, and the excess rate is 80%, which makes it difficult to make a small sample, although it can be adjusted with a small rolling machine. The rolling rate is similar to that of the workshop production, but the stacking time is relatively long. Now the small sample is made by padding and sucking the mixed dye solution, and then heating and fixing the color in a microwave oven.

[0012] The inventor applied for a patent No. ZL200410065918.0 on December 22, 2004, and the name of the invention is a patent on the padding exhaust dyeing cold batch process of circular knitted fabrics. Although it is also an exhaust dyeing cold batch process, it is in When it is used for knitted fabrics, because spandex is used in knitted fabrics to increase the elasticity, the fabrics stretched with spandex must be pre-formed before dyeing, that is, the cylindrical fabrics are cut to form a single width, and then put on the stenter setting machine for 190°C. , 45 seconds of high temperature setting, and in order to maintain the liquid level of the rolling groove during dyeing, a soft roll with a Shore of 55 degrees is used for light rolling, but the needle loops of the cloth will fall and deform after repeated light rolling, resulting in poor hand feeling. The manufacturer has a pre-shrinking setting machine. After the cloth is pre-shrinking and setting, it can eliminate the shortcomings of lodging needle loops and poor hand feeling. If the manufacturer does not have a pre-shrinking setting machine, the cloth produced will not satisfy customers. Multiple padding, so "rolling" is not suitable for knitted fabrics but for woven fabrics, so the original patent is limited to circular knitted fabrics, which cannot meet the needs