Sulfuric Acid Treatment of Aramid Fiber for Improving the Cationic Dyeing Performance

Abstract:

In order to improve the cationic dyeing performance of para-aramid fiber, the optimal conditions of fiber pretreatment were determined through the orthogonal test with three-factor (sulfuric acid dosage, temperature and time) and four-level array using the tensile strength and apparent color depth of modified fabrics as the main evaluation criteria. Scanning electron microscope and Fourier transform infrared analyses were used to study the changes in the morphological structure and chemical groups of fibers due to modification. The results showed that the modified para-aramid fiber displayed a smoother surface, and the acid hydrolysis of polymer molecules occurred. The treatment increased the number of reactive dyeing sites on fiber surface and consequently improved the dyeing performance of para-aramid fabric. The optimal process for the modification of para-aramid fiber with sulfuric acid treatment was 2% dosage of sulfuric acid at 40°C for 1 hour. The modified and dyed fabrics showed obviously increased color depth and color fastness to rubbing and washing.

• Periodical: Advanced Materials Research (Volume 627)
• Pages: 243-247
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.627.243
• Online since: December 2012
• Authors: Dong Xia, Li Jing Wang
• Keywords: Cationic Dye, Fiber Modification, Para-Aramid Fabric Dyeing, Sulfuric Acid

References

[1] H.-J. Yoo, V. Ravichandran, and S.K. Obendorf, Pretreatments for improving the dyeability of p-aramid fibers, Text. Res. J., 64(7), (1994), p.423.

DOI: 10.1177/004051759406400708

[2] E.-M. Kim, B. Min, and J. Jang, Reactive dyeing of meta-aramid fabrics photografted with dimethylaminopropyl methacrylamide, Fibers Polym., 12(5), (2011), p.580.

DOI: 10.1007/s12221-011-0580-8

[3] R. Benrashid, and G.C. Tesoro, Effect of surface-limited reactions on the properties of kevlar® fibers, Text. Res. J., 60(6), (1990), p.334.

DOI: 10.1177/004051759006000604

[4] M. Xi, Y.-L. Li, S.-Y. Shang, D.-H. Li, Y.-X. Yin, and X.-Y. Dai, Surface modification of aramid fiber by air DBD plasma at atmospheric pressure with continuous on-line processing, Surface and Coatings Technology, 202(24), (2008), p.6029.

DOI: 10.1016/j.surfcoat.2008.06.181

[5] Y. Wu, and G.C. Tesoro, Chemical modification of kevlar fiber surfaces and of model diamides, J Appl Polym Sci, 31(4), (1986), p.1041.

DOI: 10.1002/app.1986.070310406

[6] T.S. Sokolova, Hydrolytic stability of poly -p -phenylene terephthal amide in sulfuric acid solutions, Fiber Chemistry, 8(1), (1976), p.45.

[7] H. Gu, Tensile behaviour of some high performance filaments after sulphuric acid treatment, Materials & Design, 29(8), (2008), p.1671.

DOI: 10.1016/j.matdes.2007.11.001