Can polyacrylamide pretreated fabric be dyed with reactive dyes?

The dyeing of cotton with reactive dyes using polyacrylamide pretreated fabric in the dye bath improves the dye ability of cellulosic fabrics with reactive dye, when dyeing the modified substrates.the reactive dyes can be much more efficiently exhausted and fixed onto cellulosic fabrics under neutral conditions in the absence of salt.

Why is cotton fabric dyed with reactive dyes?

The cotton fabric is dyed with reactive dyes using conventional method. This method requires more electrolytes for exhaustion and alkali for fixation. The use of high salt concentration and low reactive dye fixation lead to environmental problem related to highly colored effluent with high salt content.

How to improve the dye substantive of cotton?

These problem can be overcome by improve the dye substantively of cotton in the absence of salt and pretreating the fabric with polyacrylamide at different concentration and the primary hydroxyl groups of cellulose modified into amide groups then treatment at different concentration using pad-dry process.

How to remove hydrolyzed dye from cotton fabric?

Due to the hydrolysis of the dye, the dyeing effluent consists of large amount of hydrolyzed dye, and it requires high volume of water to remove the hydrolyzed dye in washing process. The cotton fabrics were dyed with reactive dyes using conventional method and pre-treating the fabric with Polyvinylamine Chloride.

What is salt free dyeing used to dye cotton?

The salt free dyeing used to dye cotton. In conventional Method of dyeing of cotton with reactive dyes, alkali P H is should maintain in the dye bath. This method requires more electrolytes for exhaustion and alkali for fixation. In this paper the fibre modification technique based on polyacrylamide was discussed.

Can polyvinylamine chloride be used for dyeing cotton fabrics?

It is considered that Polyvinylamine Chloride is found to be effective for pretreatment in salt free dyeing of cotton fabrics. It has been found that pretreatment of cotton before dyeing can offer a simple and effective method of improving dye-fibre affinity, avoiding the need for salt as electrolyte in dye bath.