Thermal Behavior Analysis of Melamine Modified Urea-Formaldehyde Resin with Different Molar Ratios

• Published in: Materials science forum Vol. 1001; pp. 61 - 66
• Main Authors: Xiao, Hui, Xu, Shan Feng, Xia, San Shan, Feng, Qiao Ling, Chen, Yu Zhu, Jing, Ming Wei
• Format: Journal Article
• Language: English
• Published: Pfaffikon Trans Tech Publications Ltd 01.07.2020
• Subjects: Activation energy; Aldehydes; Bonding strength; Dehydration; Heating rate; Melamine; Plywood; Pyrolysis; Thermal degradation; Thermal stability; Thermodynamic properties; Thermogravimetry; Urea formaldehyde resins; Weight loss; Pyrolysis; Low Molar Ratio; Melamine Modified Urea-Formaldehyde Resin; Kinetics
• ISSN: 0255-5476; 1662-9752; 1662-9752
• DOI: 10.4028/www.scientific.net/MSF.1001.61

In this study, Thermogravimetry (TG) were used to analyze thermal degradation properties of two kinds of low-molar ratio of the melamine-modified urea-formaldehyde resin (MUF). The MUF was calculated using Kissinger equation and Flynn-Wall-Ozawa equation Resin pyrolysis activation energy. The results showed that the curing time of low mole was longer than that of MUF resin (muf-b), the content of free formaldehyde was lower, and the formaldehyde emission and wet bonding strength of plywood were reduced by 65.79% and 21.90%, respectively. TG test showed that the pyrolysis process of MUF resins with different molar ratios can be divided into three stages: dehydration, rapid pyrolysis and carbonization. At the same heating rate, the weight loss rate, peak conversion rate and carbon residue of the high molar ratio MUF resin (MUF-a) in the fast pyrolysis stage are larger than those of the MUF-b resin. The MUF-a resin pyrolysis activation energy is 166.76 kJ/mol, and the MUF-b resin pyrolysis activation energy is 95.30 kJ/mol. High molar ratio resin has higher pyrolysis activation energy and better thermal stability.