Effect of NCO/OH ratio on the physico-mechanical properties of polyurethane-polyurea hybrid spray coatings
Negim, E., Omurbekova, K., Bekbayeva, L., Abdelhafiz, A. (2020). Effect of NCO/OH ratio on the physico-mechanical properties of polyurethane-polyurea hybrid spray coatings. EKB Journal Management System, 63(11), 4503-4508. doi: 10.21608/ejchem.2020.23845.2416
El-Sayed Moussa Negim; Kymbat Omurbekova; Lyazzat Bekbayeva; Abdasssalam Abdelhafiz. "Effect of NCO/OH ratio on the physico-mechanical properties of polyurethane-polyurea hybrid spray coatings". EKB Journal Management System, 63, 11, 2020, 4503-4508. doi: 10.21608/ejchem.2020.23845.2416
Negim, E., Omurbekova, K., Bekbayeva, L., Abdelhafiz, A. (2020). 'Effect of NCO/OH ratio on the physico-mechanical properties of polyurethane-polyurea hybrid spray coatings', EKB Journal Management System, 63(11), pp. 4503-4508. doi: 10.21608/ejchem.2020.23845.2416
Negim, E., Omurbekova, K., Bekbayeva, L., Abdelhafiz, A. Effect of NCO/OH ratio on the physico-mechanical properties of polyurethane-polyurea hybrid spray coatings. EKB Journal Management System, 2020; 63(11): 4503-4508. doi: 10.21608/ejchem.2020.23845.2416

Effect of NCO/OH ratio on the physico-mechanical properties of polyurethane-polyurea hybrid spray coatings

Egyptian Journal of Chemistry
Article 30, Volume 63, Issue 11, November 2020, Page 4503-4508  XML PDF (590.16 K)
Document Type: Original Article
DOI: 10.21608/ejchem.2020.23845.2416
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Authors
El-Sayed Moussa Negim email orcid 1; Kymbat Omurbekova2; Lyazzat Bekbayevaorcid 3; Abdasssalam Abdelhafiz4
1School of Chemical Engineering, Kazakh-British Technical University, Almaty, Kazakhstan
2School of Chemical Engineering, Kazakh-British Technical University, 106 Walikhanov Street, Almaty, 050010, Kazakhstan
3Biology Program, School of Distance Education, Universiti Sains Malaysia, Penang, Malaysia
4Chemistry Department, Faculty of Education, Sure University, Sure, Libya
Abstract
Polyurethane- polyurea hybrid spray coating was prepared by two steps polymerization. In the first step, polyurethane prepolymers (PUs) were prepared by polyaddition reaction based on 4,4\-methylene diphebyl dissocyanate (4,4\ MDI), poly(oxytetramethylene) glycol (PTMG), polyoxypropylene glycol (PPG), and triol (trade name FA-703) with different NCO/OH molar ratios. IR spectroscopy and acid-base titration were used to check the NCO content of the prepolymers. In the second step, polyurethane-polyurea hybrid resin was prepared by mixing the polyurethane prepolymer (PU) with polyoxypropylenediamine (POPA) at constant molar ratio (1: 1). The effect of NCO/OH ratios on physico-mechanical properties of the polyurethane-polyurea hybrid coating films was studied including viscosity, tensile strength, elongation at break, tear strength, contact angle and adhesion. The results obtained showed that tensile strength, contact angle and hardness increased, while viscosity, elongation, adhesion and tear strength decreased with increasing NCO/OH molar ratio.
Keywords
Polyurea; Polyurethane; Hybrid coatings; NCO/OH ratio; Mechanical properties
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