Modification of deinked pulp (DIP) by CMC Grafting

Gholami, Zahra; Azadfallah, Mohammad; Izadyar, Soheila; Roohani, Mehdi

doi:10.22092/ijwpr.2020.127976.1574

Document Type : Research Paper

Authors

¹ Department of Wood and Paper Science & Technology

² wood and paper science and technology department, of natural Resources faculty, university of Tehran. IRAN

³ Tehran university, Karaj, Iran

⁴ Standard Research Institute

https://doi.org/10.22092/ijwpr.2020.127976.1574

Abstract

In this research, deinked pulp (DIP) was modified with carboxymethyl cellulose (CMC) in order to introduce more charged groups on the surfaces of fibers which leads to improve strength properties. Modification of the pulp was conducted at mild reaction temperature conditions of 85, 95°C and 120°C at 60 and 90 minutes, and under sever conditions of 120°C for 120 minutes in the presence of calcium chloride as electrolyte. The drainage time, water retention value (WRV), tensile strength, burst strength, brightness and opacity of CMC-modified pulps were measured and compared with corresponding values of blank (untreated) pulp and CMC-treated pulps as conventional treatment. The results indicated that tensile strength and burst strength of CMC-modified pulps were improved in comparison with unmodified pulps. The behavior of pulps was different in terms of optimum reaction condition. However, no significant changes were observed for optical properties of CMC-modified pulps. Water retention value of CMC-modified pulps decreased unexpectedly in some conditions.

Keywords

References

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Iranian Journal of Wood and Paper Science Research

Modification of deinked pulp (DIP) by CMC Grafting

References

References

Volume 34, Issue 4 - Serial Number 69
February 2020
Pages 475-487

Modification of deinked pulp (DIP) by CMC Grafting

References

References

Volume 34, Issue 4 - Serial Number 69February 2020Pages 475-487

Volume 34, Issue 4 - Serial Number 69
February 2020
Pages 475-487