Improved Plywood Strength and Lowered Emissions from Soybean Meal/Melamine Urea-Formaldehyde Adhesives
Improved Plywood Strength and Lowered Emissions from Soybean Meal/Melamine Urea-Formaldehyde Adhesives
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DOI：
10.13073/0015-7473-61.8.688
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发表时间：
2011-12
影响因子：
0.9
通讯作者：
Q. Gao;S. Shi;Shifeng Zhang;Jianzhang Li;Kaiwen Liang
中科院分区：
文献类型：
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作者：
Q. Gao;S. Shi;Shifeng Zhang;Jianzhang Li;Kaiwen Liang
为提高豆粕/三聚氰胺脲醛（MUF）胶合板的湿剪切强度，降低胶合板的甲醛释放量，优化胶合板热压工艺参数。采用L（44）实验设计。采用动态力学分析仪（DMA）研究了该胶粘剂在热压过程中的固化过程。DMA结果表明，储能模量（E′）首先在72.9°C时降低到最小值，然后随着温度的升高而增加，在157.2°C时达到最大值。在高于157.2°C的温度下，储能模量随着温度升高而降低。热压温度从120°C到150°C对湿剪切强度和甲醛释放量都有显著影响，而热压时间从50到80 s/mm变化和压力从0.8到1.2 MPa变化没有发现显著影响。胶粘剂涂布速率对甲醛释放量有显著影响。没有意义.
The objective of this study was to improve the wet shear strength and reduce the formaldehyde emissions for the soybean meal/melamine urea-formaldehyde (MUF) adhesive–bonded plywood by optimizing the hot pressing parameters in plywood manufacturing. An L(44) experimental design was used. A dynamic mechanical analyzer (DMA) was used to study the curing process of the adhesive during hot pressing. The DMA results showed that the storage modulus (E′) first decreased to a minimum at 72.9°C and then increased as the temperature increased to a maximum at 157.2°C. At temperatures higher than 157.2°C, the storage modulus decreased as the temperature increased. The hot press temperature had a significant effect on both the wet shear strength and the formaldehyde emissions from 120°C to 150°C, while no significant effect was found by varying the hot press time from 50 to 80 s/mm and changing the pressure from 0.8 to 1.2 MPa. The adhesive spread rate had a significant effect on the formaldehyde emissions. No signifi...