THE 3
rd
INTERNATIONAL SCIENTIFIC CONFERENCES OF STUDENTS AND YOUNG RESEARCHERS
dedicated to the 99
th
anniversary of the National Leader of Azerbaijan Heydar Aliyev
379
In the synthesis of the recovered polyol, Di propylene glycol, diethylene
glycol and di-n-butyl amine were introduced into a 1.5-liter four-necked glass
flask with a nitrogen inlet, magnetic stirrer, and thermocouple with an exterior
electric heating mantle, reflux condenser, and magnetic stirrer unit. A ratio of
DPG: DEG of 1:1 by weight was used. The mixture (glycols/catalyst) was stirred
at 500-550 rpm while gradually raising the bath temperature to 220°C.
Polyurethane foam was washed with water and then with acetone after
isolating it from other materials. The foam was cut into small scrap of about 4-
6 cm size using a shredder and then dried in an oven at 105°C for 24 h to
remove water. After heating the bath to 180°C, the first portion, one-tenth of
the foam scrap’s total volume, was introduced into the DEG/DPG/catalyst
mixture. The rest of the foam scrap was added every ten minutes at a rate of
one-tenth of the total volume as it dissolved at 180°C. The residual mixture was
stirred for another 30 min at 220°C and then cooled to ambient temperature [3].
After experiment is carried out, desired products were obtained whose
characteristics are checked with the assist of certain equipment and testes.
References
[1] Applications and the uses of the polyurethanes. (Accessed on 2 February 2021),
https://www.polyurethanes.org/en/where-is-it/
[2] B.Godinho, N.Gama, A.Barros-Timmons, A.Ferreira (September 2021). Recycling of
different types of polyurethane foam wastes via acidolysis to produce polyurethane
coatings. Journals of Sustainable materials and technologies, 7-11 pages.
[3] Hiroko Watando, Shioko Saya, Taro Fukaya, Shinetsu Fujieda, Masaaki Yamamoto,
(2006), Improving chemical recycling rate by reclaiming polyurethane elastomer from
polyurethane foam, Journals of Sustainable materials and technologies, 6-12 pages.
[4] T. Thomson (2018), Polyurethane Immobilization of Cells and Biomolecules: Medical and
Environmental Applications. Wiley, 121 pp.
[5] John O. Akindoyo, M. D. H. Beg, Suriati Ghazali, M. R. Islam, Nitthiyah Jeyaratnam, A.R.
Yuvaraj, “Polyurethane Types, Synthesis And Applications”, 2016.
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