A Polyamic Acid from Pyromellitic Dianhydride and Diaminodiphenyl Ether for Thickening Leather and Reducing Chromium Offer in Tannage

Hong Ru Wang; Xiao Bo  Zhang; Xiao Zhou Su

doi:10.4028/www.scientific.net/AMR.791-793.40

Paper Titles

Adsorption of Cadmium (II) from Aqueous Solutions by Peanut Shell Cellulose Modified with Carbon Disulphide
p.24

Study on the Properties of Carboxyl Functionalized Kapok Fiber on Adsorption of Mercury (II)
p.28

Kinetic Studies on the Polymerization of Dicyclohexylmethylmethane-4,4'-Diisocyanate with Polyoxytetramethylene Diol
p.32

A Maleinuric Acid / Acrylic Acid Copolymer with Functions of Softening Wet-Blue and Scavenging Free Formaldehyde in Leather
p.36

A Polyamic Acid from Pyromellitic Dianhydride and Diaminodiphenyl Ether for Thickening Leather and Reducing Chromium Offer in Tannage
p.40

Characteristics of Styrene-Acrylate Micro Emulsion with High Solid Content and their Effect on the Coating Properties
p.44

Synthesis and Characterization of N, O-Carboxymethyl Chitosan
p.48

Adsorption of Copper Ions and Methylene Blue on Natural Wheat Straw and Modified Wheat Straw in Single and Binary System: Column Mode
p.52

Effects of Attapulgite on the Isothermal Crystallization Behavior of Poly(Butylene Succinate-co-Butylene Adipate)
p.56

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 791-793A Polyamic Acid from Pyromellitic Dianhydride and...

A Polyamic Acid from Pyromellitic Dianhydride and Diaminodiphenyl Ether for Thickening Leather and Reducing Chromium Offer in Tannage

Abstract:

A polyamic acid suitable for either pretanning or retanning wet-blue in leather industry has been synthesized by polycondensing pyromellitic dianhydride with diaminodiphenyl ether. Its performances for improving physical properties of crust leather, reinforcing absorption and fixation of chromium were investigated by applying it in a reduced chromium offer system. The results show that the extension and tearing strength, especially thickness of crust leather can be significantly improved by the polyamic acid, and residual chromium in spent tanning bath could be reduced to below 40 mgCr⁺³/l by pretanning with the polyamic acid. The chromium released from wet-blue during fatliquoring can be reduced by 85.7%, and kept at a much lower limit of 6 mg/l by the polyamic acid. A much fuller crust leather with shrink temperature of over 95°C can be obtained with 3% of normal chrome powder by pretannig or retanning with the polyamic acid. Therefore, this polyamic acid has the good potential for industrial application in ecological leather.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Advanced Materials Research (Volumes 791-793)

Pages:

40-43

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.791-793.40

Citation:

Cite this paper

Online since:

September 2013

Authors:

Hong Ru Wang, Xiao Bo Zhang, Xiao Zhou Su

Keywords:

Chromium Tanning, Copolymer, Polyamic Acid, Pre-Tanning, Re-Tanning

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] V. J. Sundar, J. R. Rao, C. Muralidhara: Journal of Cleaner Production Vol. 10(2002), pp.69-74.

Google Scholar

[2] S. Sundarapandiyan, E. P. Brutto, G. Siddhartha, R. Ramesh, B. Ramanaiah, P. Saravanan, A. B. Mandal: Journal of Hazardous Materials Vol. 190 (2011), pp.802-809.

DOI: 10.1016/j.jhazmat.2011.03.117

Google Scholar

[3] R. Karthikeyan, S. Balaji, N. K. Chandrababu, P. K. Sehgal: Clean Technologies and Environmental Policy Vol. 10 (2008), pp.295-301.

DOI: 10.1007/s10098-007-0119-2

Google Scholar

[4] K. Fujihara, K. Ono, K. Akahori: US Patent 6, 852, 826 (2005).

Google Scholar

[5] S. Niyogi, B. Adhikari: European Polymer Journal Vol. 38 (2002), p.1237–1243.

Google Scholar

[6] L. Z. Zhou, H. R. Wang: China Plastics Industry Vol. 37 (2009), pp.75-79.

Google Scholar