Preparation and thermal degradation property analysis of the tea-based melamine-modified urea–formaldehyde (TMUF) resin

In this work, tea powder was used as a filler to produce low-formaldehyde-emission tea-based melamine-modified urea–formaldehyde resin (TMUF). The thermal stabilities of TMUF and the resin without tea powder (MUF0) were characterized using thermogravimetry. The optimal amount of tea powder m (tea)/...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2021-11, Vol.146 (4), p.1845-1852
Main Authors: Xu, Shanfeng, Xiao, Hui, Chen, Yuzhu, Li, Jing, Jiang, Ke, He, Xie, Zhang, Jialin, Jiang, Yongze, Huang, Xingyan, Xie, Jiulong, Qi, Jinqiu
Format: Article
Language:English
Subjects:
Activation energy
Analysis
Analytical Chemistry
Bonding strength
Chemistry
Chemistry and Materials Science
Energy value
Formaldehyde
Inorganic Chemistry
Measurement Science and Instrumentation
Melamine
Nucleation
Physical Chemistry
Plywood
Polymer Sciences
Reaction mechanisms
Straight lines
Thermal degradation
Thermogravimetry
Urea
Urea formaldehyde resins
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Summary:In this work, tea powder was used as a filler to produce low-formaldehyde-emission tea-based melamine-modified urea–formaldehyde resin (TMUF). The thermal stabilities of TMUF and the resin without tea powder (MUF0) were characterized using thermogravimetry. The optimal amount of tea powder m (tea)/ m (tea + urea) was equal to 0.15. The formaldehyde emission of the three-layer plywood produced by TMUF was reduced by 75.43%, and the wet bonding strength of the plate was increased by 26.67% as compared with the plywood prepared by MUF0. Compared with MUF0, the thermal degradation peak temperature of TMUF resin was shifted to higher temperature, while the carbon residue was increased. The thermal degradation activation energies of TMUF and MUF0 were similar, while TMUF had a lower pre-exponential A . The Flynn–Wall–Ozawa model-free method is used to estimate various activation energy values at different conversion rates and to predict possible reaction mechanisms. Judging the reaction mechanism according to the slope of the straight line fitted by different models, the best model was based on random nucleation.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-020-10079-1