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Thermal degradation kinetics of high-performance urea-formaldehyde resin prepared by replacing partial urea with soybean processing residue
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-05-25 , DOI: 10.1002/app.54224 Di He 1, 2 , Yuhan Guo 1, 2 , Fenghang Zhao 1, 2 , Chen Wang 1, 2 , Wenyu Zheng 1, 2 , Tianle Hou 1, 2 , Xin Xie 1, 2 , Yuzhu Chen 1, 2 , Hui Xiao 1, 2
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-05-25 , DOI: 10.1002/app.54224 Di He 1, 2 , Yuhan Guo 1, 2 , Fenghang Zhao 1, 2 , Chen Wang 1, 2 , Wenyu Zheng 1, 2 , Tianle Hou 1, 2 , Xin Xie 1, 2 , Yuzhu Chen 1, 2 , Hui Xiao 1, 2
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In this work, soybean meal was applied to replace partial urea to prepare high-performance urea-formaldehyde resin (SMUF). The optimum addition amount of soybean meal was screened by the basic properties of resin, the bonding strength and formaldehyde emission of the board. The activation energy (Ea) and reaction kinetics at different conversion rates were estimated by Kissinger and Flynn–Wall–Ozawa methods. The results showed that when 5 wt% soybean meal was used to replace urea, the formaldehyde emission of plywood decreased by 19.23% and the bonding strength increased by 36.29%, which were 0.84 mg L−1 and 1.69 MPa, respectively. Meanwhile, the thermal stability of Urea-formaldehyde (UF) resin is improved. The thermal degradation Ea of SMUF is higher than that of UF, the reaction kinetic equation of both UF and SMUF are G(α) = [−ln (1 − α)]2. It is feasible to replace partial urea with soybean meal. When the addition level of soybean meal is 5 wt%, SMUF has better comprehensive performance. When the addition level of soybean meal is 10–20 wt%, the bonding strength of plywood is higher than that of UF, but the formaldehyde emission is higher. How to reduce the formaldehyde emission will be the direction of future research.
中文翻译：
大豆加工渣替代部分尿素制备高性能脲醛树脂的热降解动力学
本工作采用豆粕代替部分尿素制备高性能脲醛树脂（SMUF）。根据树脂的基本性能、板材的粘结强度和甲醛释放量筛选豆粕的最佳添加量。通过Kissinger 和Flynn-Wall-Ozawa 方法估算了不同转化率下的活化能（E a ）和反应动力学。结果表明，当用5 wt%豆粕替代尿素时，胶合板甲醛释放量降低了19.23%，胶合强度提高了36.29%，分别为0.84 mg·L -1 和1.69 MPa。同时，脲醛（UF）树脂的热稳定性得到提高。热降解EaSMUF的反应速率高于UF，UF和SMUF的反应动力学方程均为G ( α ) = [−ln (1 − α )] 2。用豆粕替代部分尿素是可行的。当豆粕添加量为5 wt%时，SMUF具有较好的综合性能。当豆粕添加量为10～20wt%时，胶合板的粘结强度高于UF，但甲醛释放量较高。如何降低甲醛释放量将是未来研究的方向。
更新日期：2023-05-25
中文翻译：
大豆加工渣替代部分尿素制备高性能脲醛树脂的热降解动力学
本工作采用豆粕代替部分尿素制备高性能脲醛树脂（SMUF）。根据树脂的基本性能、板材的粘结强度和甲醛释放量筛选豆粕的最佳添加量。通过Kissinger 和Flynn-Wall-Ozawa 方法估算了不同转化率下的活化能（E a ）和反应动力学。结果表明，当用5 wt%豆粕替代尿素时，胶合板甲醛释放量降低了19.23%，胶合强度提高了36.29%，分别为0.84 mg·L -1 和1.69 MPa。同时，脲醛（UF）树脂的热稳定性得到提高。热降解EaSMUF的反应速率高于UF，UF和SMUF的反应动力学方程均为G ( α ) = [−ln (1 − α )] 2。用豆粕替代部分尿素是可行的。当豆粕添加量为5 wt%时，SMUF具有较好的综合性能。当豆粕添加量为10～20wt%时，胶合板的粘结强度高于UF，但甲醛释放量较高。如何降低甲醛释放量将是未来研究的方向。
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