How does the textile industry use polyacrylamide?
Polyacrylamide can be used as a sizing agent and finishing agent for fabric post-treatment, and can form a flexible, anti-wrinkle, and anti-mildew protective layer. Utilizing its strong hygroscopicity, it can reduce the thread breakage rate during spinning; polyacrylamide can prevent fabric static and flame retardant; when polyacrylamide is used as a printing and dyeing auxiliary, polyacrylamide can make the product have higher adhesion It can also be used as a stabilizer for bleaching non-silicon polymers. In addition, anionic polyacrylamide can also be used for high-efficiency purification of textile printing and dyeing wastewater.
Polyacrylamide method has many applications in textile pulp, and its application scope is as follows:
1. Light yarn sizing. No matter what process is used, as long as a small amount of PAM is added to the slurry bath, the processed fabric can absorb the slurry more uniformly, strengthen the film formation, and encapsulate the entire slurry.
2. Desizing. There is also a small amount of PAM slurry bath to increase the liquid absorption rate, increase the desizing rate, increase the enzyme and oxidative desizing, so that the desizing is more uniform, and the desizing chemical concentration and the desizing cost are reduced.
3. Boiling. Polyacrylamide can reduce processing time and greatly improve production efficiency.
4. During bleaching, the application of PAM can be combined with conventional anti-migration agents to control migration, promote the increase of color transfer, and significantly reduce costs. Note: PAM is added to sulphur dyes to prevent oxidation spots on the fabric and significantly reduce fabric defects.
At present, the wastewater discharged by the textile industry is getting more and more serious. There will be a large amount of fiber dirt, various slurries, fuels and chemicals in the textile industry wastewater. It is urgent for the textile industry to take effective measures to treat textile wastewater. The following details the rational use of polyacrylamide in textile wastewater.
Textile industry production process: Cotton textile products are mainly produced by spinning, dyeing (or printing), finishing and other processes after mixing cotton or cotton and chemical fibers. There are pure cotton (grey cloth, bleached cloth, dyed cloth, printed cloth) products and cotton blended products (grey cloth, bleached cloth, dyed cloth, printed cloth). Chemical fiber accounts for a large proportion of cotton blended textile products (generally more than cotton).
Cotton textile industry waste water source: cotton textile industry waste water mainly comes from the dyeing and finishing section, including desizing, scouring, bleaching, mercerizing, dyeing, printing and finishing. There is little waste water discharge in the weaving section.
Anionic polyacrylamide treats printing wastewater: Anionic polyacrylamide can treat printing wastewater. The pollutants of printing wastewater mainly come from the washing water of toning, printing cylinder and printing screen, as well as the post-treatment wastewater of soaping, water washing and washing of printing lining. The pollution level of printing wastewater is very high. In addition, a large amount of urea is used in reactive dyes, which increases the ammonia nitrogen content in printing and dyeing wastewater. Painting wastewater The painting wastewater contains a variety of resins, formaldehyde, surfactants and so on. Except for flowers and sweaters, there is very little waste water.